├── .idea └── vcs.xml ├── README.md ├── decode_screw.py ├── screw.exe ├── screw ├── screw.c ├── screw.sln ├── screw.vcxproj ├── screwdecode.c ├── zencode.c ├── zencode.h └── zlib │ ├── bin │ ├── zlib.dll │ └── zlibd.dll │ ├── include │ ├── zconf.h │ └── zlib.h │ ├── lib │ ├── zlib.lib │ ├── zlibd.lib │ ├── zlibstatic.lib │ └── zlibstaticd.lib │ └── share │ ├── man │ └── man3 │ │ └── zlib.3 │ └── pkgconfig │ └── zlib.pc ├── test.php └── test.php.screw /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # php_screw-decrypt 2 | -------------------------------------------------------------------------------- /decode_screw.py: -------------------------------------------------------------------------------- 1 | # coding:utf-8 2 | 3 | import os 4 | import shutil 5 | import zlib 6 | 7 | PM9SCREW = b'\tPM9SCREW\t' 8 | PM9SCREW_LEN = len(PM9SCREW) 9 | pm9screw_mycryptkey = [11152, 368, 192, 1281, 62] 10 | cryptkey_len = len(pm9screw_mycryptkey) 11 | 12 | 13 | def decrypt(path, write=True): 14 | data = bytearray(open(path, 'rb').read()) 15 | 16 | if len(data) < PM9SCREW_LEN: 17 | return False 18 | 19 | if data[:PM9SCREW_LEN] != PM9SCREW: 20 | return False 21 | data = data[PM9SCREW_LEN:] 22 | data_len = len(data) 23 | out = bytearray(data_len) 24 | for i in range(data_len): 25 | out[i] = (pm9screw_mycryptkey[(data_len - i) % cryptkey_len] 26 | ^ (~data[i])) % 256 27 | try: 28 | new = zlib.decompress(out) 29 | except TypeError: 30 | new = zlib.decompress(bytes(out)).encode() 31 | if write: 32 | shutil.move(path, path + ".bak") 33 | open(path, 'wb').write(new) 34 | else: 35 | print(new) 36 | 37 | 38 | def multi_decrypt(path): 39 | if not os.path.exists(path): 40 | print('Error: %s not Found.' % path) 41 | return 42 | 43 | if os.path.isdir(path): 44 | folder = os.walk(path) 45 | 46 | for fpathe, dirs, fs in folder: 47 | for f in fs: 48 | if f.endswith('.php'): 49 | decrypt(os.path.join(fpathe, f), True) 50 | else: 51 | decrypt(path) 52 | 53 | 54 | if __name__ == '__main__': 55 | multi_decrypt('./') 56 | -------------------------------------------------------------------------------- /screw.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/screw.exe -------------------------------------------------------------------------------- /screw/screw.c: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/screw/screw.c -------------------------------------------------------------------------------- /screw/screw.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 15 4 | VisualStudioVersion = 15.0.27130.2024 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "screw", "screw.vcxproj", "{F2689F4D-7302-4A2A-930C-29B3A0DDC09E}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|x64 = Debug|x64 11 | Debug|x86 = Debug|x86 12 | Release|x64 = Release|x64 13 | Release|x86 = Release|x86 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Debug|x64.ActiveCfg = Debug|x64 17 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Debug|x64.Build.0 = Debug|x64 18 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Debug|x86.ActiveCfg = Debug|Win32 19 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Debug|x86.Build.0 = Debug|Win32 20 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Release|x64.ActiveCfg = Release|x64 21 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Release|x64.Build.0 = Release|x64 22 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Release|x86.ActiveCfg = Release|Win32 23 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E}.Release|x86.Build.0 = Release|Win32 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {0EFE3A0A-E3F8-4471-9B08-F0A21CC4B869} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /screw/screw.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 15.0 23 | {F2689F4D-7302-4A2A-930C-29B3A0DDC09E} 24 | Win32Proj 25 | screw 26 | 10.0.17134.0 27 | screw 28 | 29 | 30 | 31 | Application 32 | true 33 | v141 34 | Unicode 35 | 36 | 37 | Application 38 | false 39 | v141 40 | true 41 | Unicode 42 | 43 | 44 | Application 45 | true 46 | v141 47 | Unicode 48 | 49 | 50 | Application 51 | false 52 | v141 53 | true 54 | Unicode 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | true 76 | $(ProjectDir)zlib\lib;$(VC_LibraryPath_x86);$(WindowsSDK_LibraryPath_x86);$(NETFXKitsDir)Lib\um\x86 77 | $(ProjectDir)zlib\include;$(VC_IncludePath);$(WindowsSDK_IncludePath) 78 | .exe 79 | 80 | 81 | true 82 | $(ProjectDir)zlib\lib;$(VC_LibraryPath_x64);$(WindowsSDK_LibraryPath_x64);$(NETFXKitsDir)Lib\um\x64 83 | $(ProjectDir)zlib\include;$(VC_IncludePath);$(WindowsSDK_IncludePath) 84 | .exe 85 | 86 | 87 | false 88 | $(ProjectDir)zlib\lib;$(VC_LibraryPath_x86);$(WindowsSDK_LibraryPath_x86);$(NETFXKitsDir)Lib\um\x86 89 | $(ProjectDir)zlib\include;$(VC_IncludePath);$(WindowsSDK_IncludePath) 90 | .exe 91 | 92 | 93 | false 94 | $(ProjectDir)zlib\lib;$(VC_LibraryPath_x64);$(WindowsSDK_LibraryPath_x64);$(NETFXKitsDir)Lib\um\x64 95 | $(ProjectDir)zlib\include;$(VC_IncludePath);$(WindowsSDK_IncludePath) 96 | .exe 97 | 98 | 99 | 100 | NotUsing 101 | Level3 102 | Disabled 103 | true 104 | WIN32;_DEBUG;TEST_EXPORTS;_CONSOLE;%(PreprocessorDefinitions) 105 | true 106 | CompileAsC 107 | /D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions) 108 | 109 | 110 | Console 111 | true 112 | zlibstaticd.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 113 | 114 | 115 | 116 | 117 | NotUsing 118 | Level3 119 | Disabled 120 | true 121 | _DEBUG;TEST_EXPORTS;_CONSOLE;%(PreprocessorDefinitions) 122 | true 123 | CompileAsC 124 | /D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions) 125 | 126 | 127 | Console 128 | true 129 | zlibstaticd.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 130 | 131 | 132 | 133 | 134 | NotUsing 135 | Level3 136 | MaxSpeed 137 | true 138 | true 139 | true 140 | WIN32;NDEBUG;TEST_EXPORTS;_CONSOLE;%(PreprocessorDefinitions) 141 | true 142 | CompileAsC 143 | MultiThreadedDLL 144 | /D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions) 145 | 146 | 147 | Console 148 | true 149 | true 150 | true 151 | zlibstatic.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 152 | 153 | 154 | 155 | 156 | NotUsing 157 | Level3 158 | MaxSpeed 159 | true 160 | true 161 | true 162 | NDEBUG;TEST_EXPORTS;_CONSOLE;%(PreprocessorDefinitions) 163 | true 164 | CompileAsC 165 | /D_CRT_SECURE_NO_WARNINGS %(AdditionalOptions) 166 | 167 | 168 | Console 169 | true 170 | true 171 | true 172 | zlibstatic.lib;kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies) 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | -------------------------------------------------------------------------------- /screw/screwdecode.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include "php_screw.h" 10 | 11 | #define PM9SCREW "\tPM9SCREW\t" 12 | #define PM9SCREW_LEN 10 13 | 14 | short pm9screw_mycryptkey[] = { 15 | 11152, 368, 192, 1281, 62 16 | }; 17 | 18 | void 19 | decode_screw(char *filename) 20 | { 21 | char buf[PM9SCREW_LEN + 1]; 22 | char decode_filename[1024]; 23 | 24 | FILE *fp = fopen(filename, "r"); 25 | fread(buf, PM9SCREW_LEN, 1, fp); 26 | 27 | if (memcmp(buf, PM9SCREW, PM9SCREW_LEN) != 0) { 28 | fclose(fp); 29 | return; 30 | } 31 | 32 | struct stat stat_buf; 33 | char *datap, *newdatap; 34 | int datalen, newdatalen; 35 | int cryptkey_len = sizeof pm9screw_mycryptkey / 2; 36 | int i; 37 | int tmp; 38 | fstat(fileno(fp), &stat_buf); 39 | datalen = stat_buf.st_size - PM9SCREW_LEN; 40 | datap = (char*)malloc(datalen); 41 | fread(datap, datalen, 1, fp); 42 | fclose(fp); 43 | printf("%d\n",datalen); 44 | for(i=0; id_name, &statbuf); 70 | 71 | if ( S_ISDIR (statbuf.st_mode) ) { 72 | if (strcmp (".", entry->d_name) == 0 || strcmp ("..", entry->d_name) == 0) { 73 | continue; 74 | } 75 | get_dir_all_file (entry->d_name); 76 | } else { 77 | decode_screw(entry->d_name); 78 | } 79 | } 80 | 81 | chdir (".."); 82 | closedir (dp); 83 | } else { 84 | fprintf (stderr,"cannot open directory: %s\n",path); 85 | return; 86 | } 87 | } else { 88 | char dir[1024] = {'\0'}; 89 | char *filename = strrchr(path, '/') + 1; 90 | strncpy(dir, path, filename-path); 91 | chdir (dir); 92 | decode_screw(filename); 93 | } 94 | } 95 | 96 | 97 | 98 | int 99 | main (int argc, char *argv[]) 100 | { 101 | if (argc < 2) { 102 | fprintf (stderr,"Please Input File Path\n"); 103 | exit(0); 104 | } 105 | char *path = argv[1]; 106 | decode_screw(path); 107 | 108 | return 0; 109 | } 110 | -------------------------------------------------------------------------------- /screw/zencode.c: -------------------------------------------------------------------------------- 1 | #include "zencode.h" 2 | 3 | #define OUTBUFSIZ 100000 4 | 5 | z_stream z; 6 | char outbuf[OUTBUFSIZ]; 7 | 8 | char *zcodecom(int mode, char *inbuf, int inbuf_len, int *resultbuf_len) 9 | { 10 | int count, status; 11 | char *resultbuf; 12 | int total_count = 0; 13 | 14 | z.zalloc = Z_NULL; 15 | z.zfree = Z_NULL; 16 | z.opaque = Z_NULL; 17 | 18 | z.next_in = Z_NULL; 19 | z.avail_in = 0; 20 | if (mode == 0) { 21 | deflateInit(&z, 1); 22 | } else { 23 | inflateInit(&z); 24 | } 25 | 26 | z.next_out = outbuf; 27 | z.avail_out = OUTBUFSIZ; 28 | z.next_in = inbuf; 29 | z.avail_in = inbuf_len; 30 | 31 | resultbuf = malloc(OUTBUFSIZ); 32 | 33 | while (1) { 34 | if (mode == 0) { 35 | status = deflate(&z, Z_FINISH); 36 | } else { 37 | status = inflate(&z, Z_NO_FLUSH); 38 | } 39 | if (status == Z_STREAM_END) break; 40 | if (status != Z_OK) { 41 | if (mode == 0) { 42 | deflateEnd(&z); 43 | } else { 44 | inflateEnd(&z); 45 | } 46 | *resultbuf_len = 0; 47 | return(resultbuf); 48 | } 49 | if (z.avail_out == 0) { 50 | resultbuf = realloc(resultbuf, total_count + OUTBUFSIZ); 51 | memcpy(resultbuf + total_count, outbuf, OUTBUFSIZ); 52 | total_count += OUTBUFSIZ; 53 | z.next_out = outbuf; 54 | z.avail_out = OUTBUFSIZ; 55 | } 56 | } 57 | if ((count = OUTBUFSIZ - z.avail_out) != 0) { 58 | resultbuf = realloc(resultbuf, total_count + OUTBUFSIZ); 59 | memcpy(resultbuf + total_count, outbuf, count); 60 | total_count += count; 61 | } 62 | if (mode == 0) { 63 | deflateEnd(&z); 64 | } else { 65 | inflateEnd(&z); 66 | } 67 | *resultbuf_len = total_count; 68 | return(resultbuf); 69 | } 70 | 71 | char *zencode(char *inbuf, int inbuf_len, int *resultbuf_len) 72 | { 73 | return zcodecom(0, inbuf, inbuf_len, resultbuf_len); 74 | } 75 | 76 | char *zdecode(char *inbuf, int inbuf_len, int *resultbuf_len) 77 | { 78 | return zcodecom(1, inbuf, inbuf_len, resultbuf_len); 79 | } 80 | -------------------------------------------------------------------------------- /screw/zencode.h: -------------------------------------------------------------------------------- 1 | #ifndef ZENCODE_H 2 | #define ZENCODE_H 3 | #include 4 | #include 5 | #include 6 | #include 7 | 8 | char *zencode(char *inbuf, int inbuf_len, int *resultbuf_len); 9 | 10 | char *zdecode(char *inbuf, int inbuf_len, int *resultbuf_len); 11 | #endif -------------------------------------------------------------------------------- /screw/zlib/bin/zlib.dll: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/screw/zlib/bin/zlib.dll -------------------------------------------------------------------------------- /screw/zlib/bin/zlibd.dll: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/screw/zlib/bin/zlibd.dll -------------------------------------------------------------------------------- /screw/zlib/include/zconf.h: -------------------------------------------------------------------------------- 1 | /* zconf.h -- configuration of the zlib compression library 2 | * Copyright (C) 1995-2016 Jean-loup Gailly, Mark Adler 3 | * For conditions of distribution and use, see copyright notice in zlib.h 4 | */ 5 | 6 | /* @(#) $Id$ */ 7 | 8 | #ifndef ZCONF_H 9 | #define ZCONF_H 10 | /* #undef Z_PREFIX */ 11 | /* #undef Z_HAVE_UNISTD_H */ 12 | 13 | /* 14 | * If you *really* need a unique prefix for all types and library functions, 15 | * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it. 16 | * Even better than compiling with -DZ_PREFIX would be to use configure to set 17 | * this permanently in zconf.h using "./configure --zprefix". 18 | */ 19 | #ifdef Z_PREFIX /* may be set to #if 1 by ./configure */ 20 | # define Z_PREFIX_SET 21 | 22 | /* all linked symbols and init macros */ 23 | # define _dist_code z__dist_code 24 | # define _length_code z__length_code 25 | # define _tr_align z__tr_align 26 | # define _tr_flush_bits z__tr_flush_bits 27 | # define _tr_flush_block z__tr_flush_block 28 | # define _tr_init z__tr_init 29 | # define _tr_stored_block z__tr_stored_block 30 | # define _tr_tally z__tr_tally 31 | # define adler32 z_adler32 32 | # define adler32_combine z_adler32_combine 33 | # define adler32_combine64 z_adler32_combine64 34 | # define adler32_z z_adler32_z 35 | # ifndef Z_SOLO 36 | # define compress z_compress 37 | # define compress2 z_compress2 38 | # define compressBound z_compressBound 39 | # endif 40 | # define crc32 z_crc32 41 | # define crc32_combine z_crc32_combine 42 | # define crc32_combine64 z_crc32_combine64 43 | # define crc32_z z_crc32_z 44 | # define deflate z_deflate 45 | # define deflateBound z_deflateBound 46 | # define deflateCopy z_deflateCopy 47 | # define deflateEnd z_deflateEnd 48 | # define deflateGetDictionary z_deflateGetDictionary 49 | # define deflateInit z_deflateInit 50 | # define deflateInit2 z_deflateInit2 51 | # define deflateInit2_ z_deflateInit2_ 52 | # define deflateInit_ z_deflateInit_ 53 | # define deflateParams z_deflateParams 54 | # define deflatePending z_deflatePending 55 | # define deflatePrime z_deflatePrime 56 | # define deflateReset z_deflateReset 57 | # define deflateResetKeep z_deflateResetKeep 58 | # define deflateSetDictionary z_deflateSetDictionary 59 | # define deflateSetHeader z_deflateSetHeader 60 | # define deflateTune z_deflateTune 61 | # define deflate_copyright z_deflate_copyright 62 | # define get_crc_table z_get_crc_table 63 | # ifndef Z_SOLO 64 | # define gz_error z_gz_error 65 | # define gz_intmax z_gz_intmax 66 | # define gz_strwinerror z_gz_strwinerror 67 | # define gzbuffer z_gzbuffer 68 | # define gzclearerr z_gzclearerr 69 | # define gzclose z_gzclose 70 | # define gzclose_r z_gzclose_r 71 | # define gzclose_w z_gzclose_w 72 | # define gzdirect z_gzdirect 73 | # define gzdopen z_gzdopen 74 | # define gzeof z_gzeof 75 | # define gzerror z_gzerror 76 | # define gzflush z_gzflush 77 | # define gzfread z_gzfread 78 | # define gzfwrite z_gzfwrite 79 | # define gzgetc z_gzgetc 80 | # define gzgetc_ z_gzgetc_ 81 | # define gzgets z_gzgets 82 | # define gzoffset z_gzoffset 83 | # define gzoffset64 z_gzoffset64 84 | # define gzopen z_gzopen 85 | # define gzopen64 z_gzopen64 86 | # ifdef _WIN32 87 | # define gzopen_w z_gzopen_w 88 | # endif 89 | # define gzprintf z_gzprintf 90 | # define gzputc z_gzputc 91 | # define gzputs z_gzputs 92 | # define gzread z_gzread 93 | # define gzrewind z_gzrewind 94 | # define gzseek z_gzseek 95 | # define gzseek64 z_gzseek64 96 | # define gzsetparams z_gzsetparams 97 | # define gztell z_gztell 98 | # define gztell64 z_gztell64 99 | # define gzungetc z_gzungetc 100 | # define gzvprintf z_gzvprintf 101 | # define gzwrite z_gzwrite 102 | # endif 103 | # define inflate z_inflate 104 | # define inflateBack z_inflateBack 105 | # define inflateBackEnd z_inflateBackEnd 106 | # define inflateBackInit z_inflateBackInit 107 | # define inflateBackInit_ z_inflateBackInit_ 108 | # define inflateCodesUsed z_inflateCodesUsed 109 | # define inflateCopy z_inflateCopy 110 | # define inflateEnd z_inflateEnd 111 | # define inflateGetDictionary z_inflateGetDictionary 112 | # define inflateGetHeader z_inflateGetHeader 113 | # define inflateInit z_inflateInit 114 | # define inflateInit2 z_inflateInit2 115 | # define inflateInit2_ z_inflateInit2_ 116 | # define inflateInit_ z_inflateInit_ 117 | # define inflateMark z_inflateMark 118 | # define inflatePrime z_inflatePrime 119 | # define inflateReset z_inflateReset 120 | # define inflateReset2 z_inflateReset2 121 | # define inflateResetKeep z_inflateResetKeep 122 | # define inflateSetDictionary z_inflateSetDictionary 123 | # define inflateSync z_inflateSync 124 | # define inflateSyncPoint z_inflateSyncPoint 125 | # define inflateUndermine z_inflateUndermine 126 | # define inflateValidate z_inflateValidate 127 | # define inflate_copyright z_inflate_copyright 128 | # define inflate_fast z_inflate_fast 129 | # define inflate_table z_inflate_table 130 | # ifndef Z_SOLO 131 | # define uncompress z_uncompress 132 | # define uncompress2 z_uncompress2 133 | # endif 134 | # define zError z_zError 135 | # ifndef Z_SOLO 136 | # define zcalloc z_zcalloc 137 | # define zcfree z_zcfree 138 | # endif 139 | # define zlibCompileFlags z_zlibCompileFlags 140 | # define zlibVersion z_zlibVersion 141 | 142 | /* all zlib typedefs in zlib.h and zconf.h */ 143 | # define Byte z_Byte 144 | # define Bytef z_Bytef 145 | # define alloc_func z_alloc_func 146 | # define charf z_charf 147 | # define free_func z_free_func 148 | # ifndef Z_SOLO 149 | # define gzFile z_gzFile 150 | # endif 151 | # define gz_header z_gz_header 152 | # define gz_headerp z_gz_headerp 153 | # define in_func z_in_func 154 | # define intf z_intf 155 | # define out_func z_out_func 156 | # define uInt z_uInt 157 | # define uIntf z_uIntf 158 | # define uLong z_uLong 159 | # define uLongf z_uLongf 160 | # define voidp z_voidp 161 | # define voidpc z_voidpc 162 | # define voidpf z_voidpf 163 | 164 | /* all zlib structs in zlib.h and zconf.h */ 165 | # define gz_header_s z_gz_header_s 166 | # define internal_state z_internal_state 167 | 168 | #endif 169 | 170 | #if defined(__MSDOS__) && !defined(MSDOS) 171 | # define MSDOS 172 | #endif 173 | #if (defined(OS_2) || defined(__OS2__)) && !defined(OS2) 174 | # define OS2 175 | #endif 176 | #if defined(_WINDOWS) && !defined(WINDOWS) 177 | # define WINDOWS 178 | #endif 179 | #if defined(_WIN32) || defined(_WIN32_WCE) || defined(__WIN32__) 180 | # ifndef WIN32 181 | # define WIN32 182 | # endif 183 | #endif 184 | #if (defined(MSDOS) || defined(OS2) || defined(WINDOWS)) && !defined(WIN32) 185 | # if !defined(__GNUC__) && !defined(__FLAT__) && !defined(__386__) 186 | # ifndef SYS16BIT 187 | # define SYS16BIT 188 | # endif 189 | # endif 190 | #endif 191 | 192 | /* 193 | * Compile with -DMAXSEG_64K if the alloc function cannot allocate more 194 | * than 64k bytes at a time (needed on systems with 16-bit int). 195 | */ 196 | #ifdef SYS16BIT 197 | # define MAXSEG_64K 198 | #endif 199 | #ifdef MSDOS 200 | # define UNALIGNED_OK 201 | #endif 202 | 203 | #ifdef __STDC_VERSION__ 204 | # ifndef STDC 205 | # define STDC 206 | # endif 207 | # if __STDC_VERSION__ >= 199901L 208 | # ifndef STDC99 209 | # define STDC99 210 | # endif 211 | # endif 212 | #endif 213 | #if !defined(STDC) && (defined(__STDC__) || defined(__cplusplus)) 214 | # define STDC 215 | #endif 216 | #if !defined(STDC) && (defined(__GNUC__) || defined(__BORLANDC__)) 217 | # define STDC 218 | #endif 219 | #if !defined(STDC) && (defined(MSDOS) || defined(WINDOWS) || defined(WIN32)) 220 | # define STDC 221 | #endif 222 | #if !defined(STDC) && (defined(OS2) || defined(__HOS_AIX__)) 223 | # define STDC 224 | #endif 225 | 226 | #if defined(__OS400__) && !defined(STDC) /* iSeries (formerly AS/400). */ 227 | # define STDC 228 | #endif 229 | 230 | #ifndef STDC 231 | # ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */ 232 | # define const /* note: need a more gentle solution here */ 233 | # endif 234 | #endif 235 | 236 | #if defined(ZLIB_CONST) && !defined(z_const) 237 | # define z_const const 238 | #else 239 | # define z_const 240 | #endif 241 | 242 | #ifdef Z_SOLO 243 | typedef unsigned long z_size_t; 244 | #else 245 | # define z_longlong long long 246 | # if defined(NO_SIZE_T) 247 | typedef unsigned NO_SIZE_T z_size_t; 248 | # elif defined(STDC) 249 | # include 250 | typedef size_t z_size_t; 251 | # else 252 | typedef unsigned long z_size_t; 253 | # endif 254 | # undef z_longlong 255 | #endif 256 | 257 | /* Maximum value for memLevel in deflateInit2 */ 258 | #ifndef MAX_MEM_LEVEL 259 | # ifdef MAXSEG_64K 260 | # define MAX_MEM_LEVEL 8 261 | # else 262 | # define MAX_MEM_LEVEL 9 263 | # endif 264 | #endif 265 | 266 | /* Maximum value for windowBits in deflateInit2 and inflateInit2. 267 | * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files 268 | * created by gzip. (Files created by minigzip can still be extracted by 269 | * gzip.) 270 | */ 271 | #ifndef MAX_WBITS 272 | # define MAX_WBITS 15 /* 32K LZ77 window */ 273 | #endif 274 | 275 | /* The memory requirements for deflate are (in bytes): 276 | (1 << (windowBits+2)) + (1 << (memLevel+9)) 277 | that is: 128K for windowBits=15 + 128K for memLevel = 8 (default values) 278 | plus a few kilobytes for small objects. For example, if you want to reduce 279 | the default memory requirements from 256K to 128K, compile with 280 | make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7" 281 | Of course this will generally degrade compression (there's no free lunch). 282 | 283 | The memory requirements for inflate are (in bytes) 1 << windowBits 284 | that is, 32K for windowBits=15 (default value) plus about 7 kilobytes 285 | for small objects. 286 | */ 287 | 288 | /* Type declarations */ 289 | 290 | #ifndef OF /* function prototypes */ 291 | # ifdef STDC 292 | # define OF(args) args 293 | # else 294 | # define OF(args) () 295 | # endif 296 | #endif 297 | 298 | #ifndef Z_ARG /* function prototypes for stdarg */ 299 | # if defined(STDC) || defined(Z_HAVE_STDARG_H) 300 | # define Z_ARG(args) args 301 | # else 302 | # define Z_ARG(args) () 303 | # endif 304 | #endif 305 | 306 | /* The following definitions for FAR are needed only for MSDOS mixed 307 | * model programming (small or medium model with some far allocations). 308 | * This was tested only with MSC; for other MSDOS compilers you may have 309 | * to define NO_MEMCPY in zutil.h. If you don't need the mixed model, 310 | * just define FAR to be empty. 311 | */ 312 | #ifdef SYS16BIT 313 | # if defined(M_I86SM) || defined(M_I86MM) 314 | /* MSC small or medium model */ 315 | # define SMALL_MEDIUM 316 | # ifdef _MSC_VER 317 | # define FAR _far 318 | # else 319 | # define FAR far 320 | # endif 321 | # endif 322 | # if (defined(__SMALL__) || defined(__MEDIUM__)) 323 | /* Turbo C small or medium model */ 324 | # define SMALL_MEDIUM 325 | # ifdef __BORLANDC__ 326 | # define FAR _far 327 | # else 328 | # define FAR far 329 | # endif 330 | # endif 331 | #endif 332 | 333 | #if defined(WINDOWS) || defined(WIN32) 334 | /* If building or using zlib as a DLL, define ZLIB_DLL. 335 | * This is not mandatory, but it offers a little performance increase. 336 | */ 337 | # ifdef ZLIB_DLL 338 | # if defined(WIN32) && (!defined(__BORLANDC__) || (__BORLANDC__ >= 0x500)) 339 | # ifdef ZLIB_INTERNAL 340 | # define ZEXTERN extern __declspec(dllexport) 341 | # else 342 | # define ZEXTERN extern __declspec(dllimport) 343 | # endif 344 | # endif 345 | # endif /* ZLIB_DLL */ 346 | /* If building or using zlib with the WINAPI/WINAPIV calling convention, 347 | * define ZLIB_WINAPI. 348 | * Caution: the standard ZLIB1.DLL is NOT compiled using ZLIB_WINAPI. 349 | */ 350 | # ifdef ZLIB_WINAPI 351 | # ifdef FAR 352 | # undef FAR 353 | # endif 354 | # include 355 | /* No need for _export, use ZLIB.DEF instead. */ 356 | /* For complete Windows compatibility, use WINAPI, not __stdcall. */ 357 | # define ZEXPORT WINAPI 358 | # ifdef WIN32 359 | # define ZEXPORTVA WINAPIV 360 | # else 361 | # define ZEXPORTVA FAR CDECL 362 | # endif 363 | # endif 364 | #endif 365 | 366 | #if defined (__BEOS__) 367 | # ifdef ZLIB_DLL 368 | # ifdef ZLIB_INTERNAL 369 | # define ZEXPORT __declspec(dllexport) 370 | # define ZEXPORTVA __declspec(dllexport) 371 | # else 372 | # define ZEXPORT __declspec(dllimport) 373 | # define ZEXPORTVA __declspec(dllimport) 374 | # endif 375 | # endif 376 | #endif 377 | 378 | #ifndef ZEXTERN 379 | # define ZEXTERN extern 380 | #endif 381 | #ifndef ZEXPORT 382 | # define ZEXPORT 383 | #endif 384 | #ifndef ZEXPORTVA 385 | # define ZEXPORTVA 386 | #endif 387 | 388 | #ifndef FAR 389 | # define FAR 390 | #endif 391 | 392 | #if !defined(__MACTYPES__) 393 | typedef unsigned char Byte; /* 8 bits */ 394 | #endif 395 | typedef unsigned int uInt; /* 16 bits or more */ 396 | typedef unsigned long uLong; /* 32 bits or more */ 397 | 398 | #ifdef SMALL_MEDIUM 399 | /* Borland C/C++ and some old MSC versions ignore FAR inside typedef */ 400 | # define Bytef Byte FAR 401 | #else 402 | typedef Byte FAR Bytef; 403 | #endif 404 | typedef char FAR charf; 405 | typedef int FAR intf; 406 | typedef uInt FAR uIntf; 407 | typedef uLong FAR uLongf; 408 | 409 | #ifdef STDC 410 | typedef void const *voidpc; 411 | typedef void FAR *voidpf; 412 | typedef void *voidp; 413 | #else 414 | typedef Byte const *voidpc; 415 | typedef Byte FAR *voidpf; 416 | typedef Byte *voidp; 417 | #endif 418 | 419 | #if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC) 420 | # include 421 | # if (UINT_MAX == 0xffffffffUL) 422 | # define Z_U4 unsigned 423 | # elif (ULONG_MAX == 0xffffffffUL) 424 | # define Z_U4 unsigned long 425 | # elif (USHRT_MAX == 0xffffffffUL) 426 | # define Z_U4 unsigned short 427 | # endif 428 | #endif 429 | 430 | #ifdef Z_U4 431 | typedef Z_U4 z_crc_t; 432 | #else 433 | typedef unsigned long z_crc_t; 434 | #endif 435 | 436 | #ifdef HAVE_UNISTD_H /* may be set to #if 1 by ./configure */ 437 | # define Z_HAVE_UNISTD_H 438 | #endif 439 | 440 | #ifdef HAVE_STDARG_H /* may be set to #if 1 by ./configure */ 441 | # define Z_HAVE_STDARG_H 442 | #endif 443 | 444 | #ifdef STDC 445 | # ifndef Z_SOLO 446 | # include /* for off_t */ 447 | # endif 448 | #endif 449 | 450 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) 451 | # ifndef Z_SOLO 452 | # include /* for va_list */ 453 | # endif 454 | #endif 455 | 456 | #ifdef _WIN32 457 | # ifndef Z_SOLO 458 | # include /* for wchar_t */ 459 | # endif 460 | #endif 461 | 462 | /* a little trick to accommodate both "#define _LARGEFILE64_SOURCE" and 463 | * "#define _LARGEFILE64_SOURCE 1" as requesting 64-bit operations, (even 464 | * though the former does not conform to the LFS document), but considering 465 | * both "#undef _LARGEFILE64_SOURCE" and "#define _LARGEFILE64_SOURCE 0" as 466 | * equivalently requesting no 64-bit operations 467 | */ 468 | #if defined(_LARGEFILE64_SOURCE) && -_LARGEFILE64_SOURCE - -1 == 1 469 | # undef _LARGEFILE64_SOURCE 470 | #endif 471 | 472 | #if defined(__WATCOMC__) && !defined(Z_HAVE_UNISTD_H) 473 | # define Z_HAVE_UNISTD_H 474 | #endif 475 | #ifndef Z_SOLO 476 | # if defined(Z_HAVE_UNISTD_H) || defined(_LARGEFILE64_SOURCE) 477 | # include /* for SEEK_*, off_t, and _LFS64_LARGEFILE */ 478 | # ifdef VMS 479 | # include /* for off_t */ 480 | # endif 481 | # ifndef z_off_t 482 | # define z_off_t off_t 483 | # endif 484 | # endif 485 | #endif 486 | 487 | #if defined(_LFS64_LARGEFILE) && _LFS64_LARGEFILE-0 488 | # define Z_LFS64 489 | #endif 490 | 491 | #if defined(_LARGEFILE64_SOURCE) && defined(Z_LFS64) 492 | # define Z_LARGE64 493 | #endif 494 | 495 | #if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS-0 == 64 && defined(Z_LFS64) 496 | # define Z_WANT64 497 | #endif 498 | 499 | #if !defined(SEEK_SET) && !defined(Z_SOLO) 500 | # define SEEK_SET 0 /* Seek from beginning of file. */ 501 | # define SEEK_CUR 1 /* Seek from current position. */ 502 | # define SEEK_END 2 /* Set file pointer to EOF plus "offset" */ 503 | #endif 504 | 505 | #ifndef z_off_t 506 | # define z_off_t long 507 | #endif 508 | 509 | #if !defined(_WIN32) && defined(Z_LARGE64) 510 | # define z_off64_t off64_t 511 | #else 512 | # if defined(_WIN32) && !defined(__GNUC__) && !defined(Z_SOLO) 513 | # define z_off64_t __int64 514 | # else 515 | # define z_off64_t z_off_t 516 | # endif 517 | #endif 518 | 519 | /* MVS linker does not support external names larger than 8 bytes */ 520 | #if defined(__MVS__) 521 | #pragma map(deflateInit_,"DEIN") 522 | #pragma map(deflateInit2_,"DEIN2") 523 | #pragma map(deflateEnd,"DEEND") 524 | #pragma map(deflateBound,"DEBND") 525 | #pragma map(inflateInit_,"ININ") 526 | #pragma map(inflateInit2_,"ININ2") 527 | #pragma map(inflateEnd,"INEND") 528 | #pragma map(inflateSync,"INSY") 529 | #pragma map(inflateSetDictionary,"INSEDI") 530 | #pragma map(compressBound,"CMBND") 531 | #pragma map(inflate_table,"INTABL") 532 | #pragma map(inflate_fast,"INFA") 533 | #pragma map(inflate_copyright,"INCOPY") 534 | #endif 535 | 536 | #endif /* ZCONF_H */ 537 | -------------------------------------------------------------------------------- /screw/zlib/include/zlib.h: -------------------------------------------------------------------------------- 1 | /* zlib.h -- interface of the 'zlib' general purpose compression library 2 | version 1.2.11, January 15th, 2017 3 | 4 | Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler 5 | 6 | This software is provided 'as-is', without any express or implied 7 | warranty. In no event will the authors be held liable for any damages 8 | arising from the use of this software. 9 | 10 | Permission is granted to anyone to use this software for any purpose, 11 | including commercial applications, and to alter it and redistribute it 12 | freely, subject to the following restrictions: 13 | 14 | 1. The origin of this software must not be misrepresented; you must not 15 | claim that you wrote the original software. If you use this software 16 | in a product, an acknowledgment in the product documentation would be 17 | appreciated but is not required. 18 | 2. Altered source versions must be plainly marked as such, and must not be 19 | misrepresented as being the original software. 20 | 3. This notice may not be removed or altered from any source distribution. 21 | 22 | Jean-loup Gailly Mark Adler 23 | jloup@gzip.org madler@alumni.caltech.edu 24 | 25 | 26 | The data format used by the zlib library is described by RFCs (Request for 27 | Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950 28 | (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format). 29 | */ 30 | 31 | #ifndef ZLIB_H 32 | #define ZLIB_H 33 | 34 | #include "zconf.h" 35 | 36 | #ifdef __cplusplus 37 | extern "C" { 38 | #endif 39 | 40 | #define ZLIB_VERSION "1.2.11" 41 | #define ZLIB_VERNUM 0x12b0 42 | #define ZLIB_VER_MAJOR 1 43 | #define ZLIB_VER_MINOR 2 44 | #define ZLIB_VER_REVISION 11 45 | #define ZLIB_VER_SUBREVISION 0 46 | 47 | /* 48 | The 'zlib' compression library provides in-memory compression and 49 | decompression functions, including integrity checks of the uncompressed data. 50 | This version of the library supports only one compression method (deflation) 51 | but other algorithms will be added later and will have the same stream 52 | interface. 53 | 54 | Compression can be done in a single step if the buffers are large enough, 55 | or can be done by repeated calls of the compression function. In the latter 56 | case, the application must provide more input and/or consume the output 57 | (providing more output space) before each call. 58 | 59 | The compressed data format used by default by the in-memory functions is 60 | the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped 61 | around a deflate stream, which is itself documented in RFC 1951. 62 | 63 | The library also supports reading and writing files in gzip (.gz) format 64 | with an interface similar to that of stdio using the functions that start 65 | with "gz". The gzip format is different from the zlib format. gzip is a 66 | gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. 67 | 68 | This library can optionally read and write gzip and raw deflate streams in 69 | memory as well. 70 | 71 | The zlib format was designed to be compact and fast for use in memory 72 | and on communications channels. The gzip format was designed for single- 73 | file compression on file systems, has a larger header than zlib to maintain 74 | directory information, and uses a different, slower check method than zlib. 75 | 76 | The library does not install any signal handler. The decoder checks 77 | the consistency of the compressed data, so the library should never crash 78 | even in the case of corrupted input. 79 | */ 80 | 81 | typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); 82 | typedef void (*free_func) OF((voidpf opaque, voidpf address)); 83 | 84 | struct internal_state; 85 | 86 | typedef struct z_stream_s { 87 | z_const Bytef *next_in; /* next input byte */ 88 | uInt avail_in; /* number of bytes available at next_in */ 89 | uLong total_in; /* total number of input bytes read so far */ 90 | 91 | Bytef *next_out; /* next output byte will go here */ 92 | uInt avail_out; /* remaining free space at next_out */ 93 | uLong total_out; /* total number of bytes output so far */ 94 | 95 | z_const char *msg; /* last error message, NULL if no error */ 96 | struct internal_state FAR *state; /* not visible by applications */ 97 | 98 | alloc_func zalloc; /* used to allocate the internal state */ 99 | free_func zfree; /* used to free the internal state */ 100 | voidpf opaque; /* private data object passed to zalloc and zfree */ 101 | 102 | int data_type; /* best guess about the data type: binary or text 103 | for deflate, or the decoding state for inflate */ 104 | uLong adler; /* Adler-32 or CRC-32 value of the uncompressed data */ 105 | uLong reserved; /* reserved for future use */ 106 | } z_stream; 107 | 108 | typedef z_stream FAR *z_streamp; 109 | 110 | /* 111 | gzip header information passed to and from zlib routines. See RFC 1952 112 | for more details on the meanings of these fields. 113 | */ 114 | typedef struct gz_header_s { 115 | int text; /* true if compressed data believed to be text */ 116 | uLong time; /* modification time */ 117 | int xflags; /* extra flags (not used when writing a gzip file) */ 118 | int os; /* operating system */ 119 | Bytef *extra; /* pointer to extra field or Z_NULL if none */ 120 | uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ 121 | uInt extra_max; /* space at extra (only when reading header) */ 122 | Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ 123 | uInt name_max; /* space at name (only when reading header) */ 124 | Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ 125 | uInt comm_max; /* space at comment (only when reading header) */ 126 | int hcrc; /* true if there was or will be a header crc */ 127 | int done; /* true when done reading gzip header (not used 128 | when writing a gzip file) */ 129 | } gz_header; 130 | 131 | typedef gz_header FAR *gz_headerp; 132 | 133 | /* 134 | The application must update next_in and avail_in when avail_in has dropped 135 | to zero. It must update next_out and avail_out when avail_out has dropped 136 | to zero. The application must initialize zalloc, zfree and opaque before 137 | calling the init function. All other fields are set by the compression 138 | library and must not be updated by the application. 139 | 140 | The opaque value provided by the application will be passed as the first 141 | parameter for calls of zalloc and zfree. This can be useful for custom 142 | memory management. The compression library attaches no meaning to the 143 | opaque value. 144 | 145 | zalloc must return Z_NULL if there is not enough memory for the object. 146 | If zlib is used in a multi-threaded application, zalloc and zfree must be 147 | thread safe. In that case, zlib is thread-safe. When zalloc and zfree are 148 | Z_NULL on entry to the initialization function, they are set to internal 149 | routines that use the standard library functions malloc() and free(). 150 | 151 | On 16-bit systems, the functions zalloc and zfree must be able to allocate 152 | exactly 65536 bytes, but will not be required to allocate more than this if 153 | the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers 154 | returned by zalloc for objects of exactly 65536 bytes *must* have their 155 | offset normalized to zero. The default allocation function provided by this 156 | library ensures this (see zutil.c). To reduce memory requirements and avoid 157 | any allocation of 64K objects, at the expense of compression ratio, compile 158 | the library with -DMAX_WBITS=14 (see zconf.h). 159 | 160 | The fields total_in and total_out can be used for statistics or progress 161 | reports. After compression, total_in holds the total size of the 162 | uncompressed data and may be saved for use by the decompressor (particularly 163 | if the decompressor wants to decompress everything in a single step). 164 | */ 165 | 166 | /* constants */ 167 | 168 | #define Z_NO_FLUSH 0 169 | #define Z_PARTIAL_FLUSH 1 170 | #define Z_SYNC_FLUSH 2 171 | #define Z_FULL_FLUSH 3 172 | #define Z_FINISH 4 173 | #define Z_BLOCK 5 174 | #define Z_TREES 6 175 | /* Allowed flush values; see deflate() and inflate() below for details */ 176 | 177 | #define Z_OK 0 178 | #define Z_STREAM_END 1 179 | #define Z_NEED_DICT 2 180 | #define Z_ERRNO (-1) 181 | #define Z_STREAM_ERROR (-2) 182 | #define Z_DATA_ERROR (-3) 183 | #define Z_MEM_ERROR (-4) 184 | #define Z_BUF_ERROR (-5) 185 | #define Z_VERSION_ERROR (-6) 186 | /* Return codes for the compression/decompression functions. Negative values 187 | * are errors, positive values are used for special but normal events. 188 | */ 189 | 190 | #define Z_NO_COMPRESSION 0 191 | #define Z_BEST_SPEED 1 192 | #define Z_BEST_COMPRESSION 9 193 | #define Z_DEFAULT_COMPRESSION (-1) 194 | /* compression levels */ 195 | 196 | #define Z_FILTERED 1 197 | #define Z_HUFFMAN_ONLY 2 198 | #define Z_RLE 3 199 | #define Z_FIXED 4 200 | #define Z_DEFAULT_STRATEGY 0 201 | /* compression strategy; see deflateInit2() below for details */ 202 | 203 | #define Z_BINARY 0 204 | #define Z_TEXT 1 205 | #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ 206 | #define Z_UNKNOWN 2 207 | /* Possible values of the data_type field for deflate() */ 208 | 209 | #define Z_DEFLATED 8 210 | /* The deflate compression method (the only one supported in this version) */ 211 | 212 | #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ 213 | 214 | #define zlib_version zlibVersion() 215 | /* for compatibility with versions < 1.0.2 */ 216 | 217 | 218 | /* basic functions */ 219 | 220 | ZEXTERN const char * ZEXPORT zlibVersion OF((void)); 221 | /* The application can compare zlibVersion and ZLIB_VERSION for consistency. 222 | If the first character differs, the library code actually used is not 223 | compatible with the zlib.h header file used by the application. This check 224 | is automatically made by deflateInit and inflateInit. 225 | */ 226 | 227 | /* 228 | ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); 229 | 230 | Initializes the internal stream state for compression. The fields 231 | zalloc, zfree and opaque must be initialized before by the caller. If 232 | zalloc and zfree are set to Z_NULL, deflateInit updates them to use default 233 | allocation functions. 234 | 235 | The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 236 | 1 gives best speed, 9 gives best compression, 0 gives no compression at all 237 | (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION 238 | requests a default compromise between speed and compression (currently 239 | equivalent to level 6). 240 | 241 | deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough 242 | memory, Z_STREAM_ERROR if level is not a valid compression level, or 243 | Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible 244 | with the version assumed by the caller (ZLIB_VERSION). msg is set to null 245 | if there is no error message. deflateInit does not perform any compression: 246 | this will be done by deflate(). 247 | */ 248 | 249 | 250 | ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); 251 | /* 252 | deflate compresses as much data as possible, and stops when the input 253 | buffer becomes empty or the output buffer becomes full. It may introduce 254 | some output latency (reading input without producing any output) except when 255 | forced to flush. 256 | 257 | The detailed semantics are as follows. deflate performs one or both of the 258 | following actions: 259 | 260 | - Compress more input starting at next_in and update next_in and avail_in 261 | accordingly. If not all input can be processed (because there is not 262 | enough room in the output buffer), next_in and avail_in are updated and 263 | processing will resume at this point for the next call of deflate(). 264 | 265 | - Generate more output starting at next_out and update next_out and avail_out 266 | accordingly. This action is forced if the parameter flush is non zero. 267 | Forcing flush frequently degrades the compression ratio, so this parameter 268 | should be set only when necessary. Some output may be provided even if 269 | flush is zero. 270 | 271 | Before the call of deflate(), the application should ensure that at least 272 | one of the actions is possible, by providing more input and/or consuming more 273 | output, and updating avail_in or avail_out accordingly; avail_out should 274 | never be zero before the call. The application can consume the compressed 275 | output when it wants, for example when the output buffer is full (avail_out 276 | == 0), or after each call of deflate(). If deflate returns Z_OK and with 277 | zero avail_out, it must be called again after making room in the output 278 | buffer because there might be more output pending. See deflatePending(), 279 | which can be used if desired to determine whether or not there is more ouput 280 | in that case. 281 | 282 | Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to 283 | decide how much data to accumulate before producing output, in order to 284 | maximize compression. 285 | 286 | If the parameter flush is set to Z_SYNC_FLUSH, all pending output is 287 | flushed to the output buffer and the output is aligned on a byte boundary, so 288 | that the decompressor can get all input data available so far. (In 289 | particular avail_in is zero after the call if enough output space has been 290 | provided before the call.) Flushing may degrade compression for some 291 | compression algorithms and so it should be used only when necessary. This 292 | completes the current deflate block and follows it with an empty stored block 293 | that is three bits plus filler bits to the next byte, followed by four bytes 294 | (00 00 ff ff). 295 | 296 | If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the 297 | output buffer, but the output is not aligned to a byte boundary. All of the 298 | input data so far will be available to the decompressor, as for Z_SYNC_FLUSH. 299 | This completes the current deflate block and follows it with an empty fixed 300 | codes block that is 10 bits long. This assures that enough bytes are output 301 | in order for the decompressor to finish the block before the empty fixed 302 | codes block. 303 | 304 | If flush is set to Z_BLOCK, a deflate block is completed and emitted, as 305 | for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to 306 | seven bits of the current block are held to be written as the next byte after 307 | the next deflate block is completed. In this case, the decompressor may not 308 | be provided enough bits at this point in order to complete decompression of 309 | the data provided so far to the compressor. It may need to wait for the next 310 | block to be emitted. This is for advanced applications that need to control 311 | the emission of deflate blocks. 312 | 313 | If flush is set to Z_FULL_FLUSH, all output is flushed as with 314 | Z_SYNC_FLUSH, and the compression state is reset so that decompression can 315 | restart from this point if previous compressed data has been damaged or if 316 | random access is desired. Using Z_FULL_FLUSH too often can seriously degrade 317 | compression. 318 | 319 | If deflate returns with avail_out == 0, this function must be called again 320 | with the same value of the flush parameter and more output space (updated 321 | avail_out), until the flush is complete (deflate returns with non-zero 322 | avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that 323 | avail_out is greater than six to avoid repeated flush markers due to 324 | avail_out == 0 on return. 325 | 326 | If the parameter flush is set to Z_FINISH, pending input is processed, 327 | pending output is flushed and deflate returns with Z_STREAM_END if there was 328 | enough output space. If deflate returns with Z_OK or Z_BUF_ERROR, this 329 | function must be called again with Z_FINISH and more output space (updated 330 | avail_out) but no more input data, until it returns with Z_STREAM_END or an 331 | error. After deflate has returned Z_STREAM_END, the only possible operations 332 | on the stream are deflateReset or deflateEnd. 333 | 334 | Z_FINISH can be used in the first deflate call after deflateInit if all the 335 | compression is to be done in a single step. In order to complete in one 336 | call, avail_out must be at least the value returned by deflateBound (see 337 | below). Then deflate is guaranteed to return Z_STREAM_END. If not enough 338 | output space is provided, deflate will not return Z_STREAM_END, and it must 339 | be called again as described above. 340 | 341 | deflate() sets strm->adler to the Adler-32 checksum of all input read 342 | so far (that is, total_in bytes). If a gzip stream is being generated, then 343 | strm->adler will be the CRC-32 checksum of the input read so far. (See 344 | deflateInit2 below.) 345 | 346 | deflate() may update strm->data_type if it can make a good guess about 347 | the input data type (Z_BINARY or Z_TEXT). If in doubt, the data is 348 | considered binary. This field is only for information purposes and does not 349 | affect the compression algorithm in any manner. 350 | 351 | deflate() returns Z_OK if some progress has been made (more input 352 | processed or more output produced), Z_STREAM_END if all input has been 353 | consumed and all output has been produced (only when flush is set to 354 | Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example 355 | if next_in or next_out was Z_NULL or the state was inadvertently written over 356 | by the application), or Z_BUF_ERROR if no progress is possible (for example 357 | avail_in or avail_out was zero). Note that Z_BUF_ERROR is not fatal, and 358 | deflate() can be called again with more input and more output space to 359 | continue compressing. 360 | */ 361 | 362 | 363 | ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); 364 | /* 365 | All dynamically allocated data structures for this stream are freed. 366 | This function discards any unprocessed input and does not flush any pending 367 | output. 368 | 369 | deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the 370 | stream state was inconsistent, Z_DATA_ERROR if the stream was freed 371 | prematurely (some input or output was discarded). In the error case, msg 372 | may be set but then points to a static string (which must not be 373 | deallocated). 374 | */ 375 | 376 | 377 | /* 378 | ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); 379 | 380 | Initializes the internal stream state for decompression. The fields 381 | next_in, avail_in, zalloc, zfree and opaque must be initialized before by 382 | the caller. In the current version of inflate, the provided input is not 383 | read or consumed. The allocation of a sliding window will be deferred to 384 | the first call of inflate (if the decompression does not complete on the 385 | first call). If zalloc and zfree are set to Z_NULL, inflateInit updates 386 | them to use default allocation functions. 387 | 388 | inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough 389 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the 390 | version assumed by the caller, or Z_STREAM_ERROR if the parameters are 391 | invalid, such as a null pointer to the structure. msg is set to null if 392 | there is no error message. inflateInit does not perform any decompression. 393 | Actual decompression will be done by inflate(). So next_in, and avail_in, 394 | next_out, and avail_out are unused and unchanged. The current 395 | implementation of inflateInit() does not process any header information -- 396 | that is deferred until inflate() is called. 397 | */ 398 | 399 | 400 | ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); 401 | /* 402 | inflate decompresses as much data as possible, and stops when the input 403 | buffer becomes empty or the output buffer becomes full. It may introduce 404 | some output latency (reading input without producing any output) except when 405 | forced to flush. 406 | 407 | The detailed semantics are as follows. inflate performs one or both of the 408 | following actions: 409 | 410 | - Decompress more input starting at next_in and update next_in and avail_in 411 | accordingly. If not all input can be processed (because there is not 412 | enough room in the output buffer), then next_in and avail_in are updated 413 | accordingly, and processing will resume at this point for the next call of 414 | inflate(). 415 | 416 | - Generate more output starting at next_out and update next_out and avail_out 417 | accordingly. inflate() provides as much output as possible, until there is 418 | no more input data or no more space in the output buffer (see below about 419 | the flush parameter). 420 | 421 | Before the call of inflate(), the application should ensure that at least 422 | one of the actions is possible, by providing more input and/or consuming more 423 | output, and updating the next_* and avail_* values accordingly. If the 424 | caller of inflate() does not provide both available input and available 425 | output space, it is possible that there will be no progress made. The 426 | application can consume the uncompressed output when it wants, for example 427 | when the output buffer is full (avail_out == 0), or after each call of 428 | inflate(). If inflate returns Z_OK and with zero avail_out, it must be 429 | called again after making room in the output buffer because there might be 430 | more output pending. 431 | 432 | The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH, 433 | Z_BLOCK, or Z_TREES. Z_SYNC_FLUSH requests that inflate() flush as much 434 | output as possible to the output buffer. Z_BLOCK requests that inflate() 435 | stop if and when it gets to the next deflate block boundary. When decoding 436 | the zlib or gzip format, this will cause inflate() to return immediately 437 | after the header and before the first block. When doing a raw inflate, 438 | inflate() will go ahead and process the first block, and will return when it 439 | gets to the end of that block, or when it runs out of data. 440 | 441 | The Z_BLOCK option assists in appending to or combining deflate streams. 442 | To assist in this, on return inflate() always sets strm->data_type to the 443 | number of unused bits in the last byte taken from strm->next_in, plus 64 if 444 | inflate() is currently decoding the last block in the deflate stream, plus 445 | 128 if inflate() returned immediately after decoding an end-of-block code or 446 | decoding the complete header up to just before the first byte of the deflate 447 | stream. The end-of-block will not be indicated until all of the uncompressed 448 | data from that block has been written to strm->next_out. The number of 449 | unused bits may in general be greater than seven, except when bit 7 of 450 | data_type is set, in which case the number of unused bits will be less than 451 | eight. data_type is set as noted here every time inflate() returns for all 452 | flush options, and so can be used to determine the amount of currently 453 | consumed input in bits. 454 | 455 | The Z_TREES option behaves as Z_BLOCK does, but it also returns when the 456 | end of each deflate block header is reached, before any actual data in that 457 | block is decoded. This allows the caller to determine the length of the 458 | deflate block header for later use in random access within a deflate block. 459 | 256 is added to the value of strm->data_type when inflate() returns 460 | immediately after reaching the end of the deflate block header. 461 | 462 | inflate() should normally be called until it returns Z_STREAM_END or an 463 | error. However if all decompression is to be performed in a single step (a 464 | single call of inflate), the parameter flush should be set to Z_FINISH. In 465 | this case all pending input is processed and all pending output is flushed; 466 | avail_out must be large enough to hold all of the uncompressed data for the 467 | operation to complete. (The size of the uncompressed data may have been 468 | saved by the compressor for this purpose.) The use of Z_FINISH is not 469 | required to perform an inflation in one step. However it may be used to 470 | inform inflate that a faster approach can be used for the single inflate() 471 | call. Z_FINISH also informs inflate to not maintain a sliding window if the 472 | stream completes, which reduces inflate's memory footprint. If the stream 473 | does not complete, either because not all of the stream is provided or not 474 | enough output space is provided, then a sliding window will be allocated and 475 | inflate() can be called again to continue the operation as if Z_NO_FLUSH had 476 | been used. 477 | 478 | In this implementation, inflate() always flushes as much output as 479 | possible to the output buffer, and always uses the faster approach on the 480 | first call. So the effects of the flush parameter in this implementation are 481 | on the return value of inflate() as noted below, when inflate() returns early 482 | when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of 483 | memory for a sliding window when Z_FINISH is used. 484 | 485 | If a preset dictionary is needed after this call (see inflateSetDictionary 486 | below), inflate sets strm->adler to the Adler-32 checksum of the dictionary 487 | chosen by the compressor and returns Z_NEED_DICT; otherwise it sets 488 | strm->adler to the Adler-32 checksum of all output produced so far (that is, 489 | total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described 490 | below. At the end of the stream, inflate() checks that its computed Adler-32 491 | checksum is equal to that saved by the compressor and returns Z_STREAM_END 492 | only if the checksum is correct. 493 | 494 | inflate() can decompress and check either zlib-wrapped or gzip-wrapped 495 | deflate data. The header type is detected automatically, if requested when 496 | initializing with inflateInit2(). Any information contained in the gzip 497 | header is not retained unless inflateGetHeader() is used. When processing 498 | gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output 499 | produced so far. The CRC-32 is checked against the gzip trailer, as is the 500 | uncompressed length, modulo 2^32. 501 | 502 | inflate() returns Z_OK if some progress has been made (more input processed 503 | or more output produced), Z_STREAM_END if the end of the compressed data has 504 | been reached and all uncompressed output has been produced, Z_NEED_DICT if a 505 | preset dictionary is needed at this point, Z_DATA_ERROR if the input data was 506 | corrupted (input stream not conforming to the zlib format or incorrect check 507 | value, in which case strm->msg points to a string with a more specific 508 | error), Z_STREAM_ERROR if the stream structure was inconsistent (for example 509 | next_in or next_out was Z_NULL, or the state was inadvertently written over 510 | by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR 511 | if no progress was possible or if there was not enough room in the output 512 | buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and 513 | inflate() can be called again with more input and more output space to 514 | continue decompressing. If Z_DATA_ERROR is returned, the application may 515 | then call inflateSync() to look for a good compression block if a partial 516 | recovery of the data is to be attempted. 517 | */ 518 | 519 | 520 | ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); 521 | /* 522 | All dynamically allocated data structures for this stream are freed. 523 | This function discards any unprocessed input and does not flush any pending 524 | output. 525 | 526 | inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state 527 | was inconsistent. 528 | */ 529 | 530 | 531 | /* Advanced functions */ 532 | 533 | /* 534 | The following functions are needed only in some special applications. 535 | */ 536 | 537 | /* 538 | ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, 539 | int level, 540 | int method, 541 | int windowBits, 542 | int memLevel, 543 | int strategy)); 544 | 545 | This is another version of deflateInit with more compression options. The 546 | fields next_in, zalloc, zfree and opaque must be initialized before by the 547 | caller. 548 | 549 | The method parameter is the compression method. It must be Z_DEFLATED in 550 | this version of the library. 551 | 552 | The windowBits parameter is the base two logarithm of the window size 553 | (the size of the history buffer). It should be in the range 8..15 for this 554 | version of the library. Larger values of this parameter result in better 555 | compression at the expense of memory usage. The default value is 15 if 556 | deflateInit is used instead. 557 | 558 | For the current implementation of deflate(), a windowBits value of 8 (a 559 | window size of 256 bytes) is not supported. As a result, a request for 8 560 | will result in 9 (a 512-byte window). In that case, providing 8 to 561 | inflateInit2() will result in an error when the zlib header with 9 is 562 | checked against the initialization of inflate(). The remedy is to not use 8 563 | with deflateInit2() with this initialization, or at least in that case use 9 564 | with inflateInit2(). 565 | 566 | windowBits can also be -8..-15 for raw deflate. In this case, -windowBits 567 | determines the window size. deflate() will then generate raw deflate data 568 | with no zlib header or trailer, and will not compute a check value. 569 | 570 | windowBits can also be greater than 15 for optional gzip encoding. Add 571 | 16 to windowBits to write a simple gzip header and trailer around the 572 | compressed data instead of a zlib wrapper. The gzip header will have no 573 | file name, no extra data, no comment, no modification time (set to zero), no 574 | header crc, and the operating system will be set to the appropriate value, 575 | if the operating system was determined at compile time. If a gzip stream is 576 | being written, strm->adler is a CRC-32 instead of an Adler-32. 577 | 578 | For raw deflate or gzip encoding, a request for a 256-byte window is 579 | rejected as invalid, since only the zlib header provides a means of 580 | transmitting the window size to the decompressor. 581 | 582 | The memLevel parameter specifies how much memory should be allocated 583 | for the internal compression state. memLevel=1 uses minimum memory but is 584 | slow and reduces compression ratio; memLevel=9 uses maximum memory for 585 | optimal speed. The default value is 8. See zconf.h for total memory usage 586 | as a function of windowBits and memLevel. 587 | 588 | The strategy parameter is used to tune the compression algorithm. Use the 589 | value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a 590 | filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no 591 | string match), or Z_RLE to limit match distances to one (run-length 592 | encoding). Filtered data consists mostly of small values with a somewhat 593 | random distribution. In this case, the compression algorithm is tuned to 594 | compress them better. The effect of Z_FILTERED is to force more Huffman 595 | coding and less string matching; it is somewhat intermediate between 596 | Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as 597 | fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data. The 598 | strategy parameter only affects the compression ratio but not the 599 | correctness of the compressed output even if it is not set appropriately. 600 | Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler 601 | decoder for special applications. 602 | 603 | deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 604 | memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid 605 | method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is 606 | incompatible with the version assumed by the caller (ZLIB_VERSION). msg is 607 | set to null if there is no error message. deflateInit2 does not perform any 608 | compression: this will be done by deflate(). 609 | */ 610 | 611 | ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, 612 | const Bytef *dictionary, 613 | uInt dictLength)); 614 | /* 615 | Initializes the compression dictionary from the given byte sequence 616 | without producing any compressed output. When using the zlib format, this 617 | function must be called immediately after deflateInit, deflateInit2 or 618 | deflateReset, and before any call of deflate. When doing raw deflate, this 619 | function must be called either before any call of deflate, or immediately 620 | after the completion of a deflate block, i.e. after all input has been 621 | consumed and all output has been delivered when using any of the flush 622 | options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH. The 623 | compressor and decompressor must use exactly the same dictionary (see 624 | inflateSetDictionary). 625 | 626 | The dictionary should consist of strings (byte sequences) that are likely 627 | to be encountered later in the data to be compressed, with the most commonly 628 | used strings preferably put towards the end of the dictionary. Using a 629 | dictionary is most useful when the data to be compressed is short and can be 630 | predicted with good accuracy; the data can then be compressed better than 631 | with the default empty dictionary. 632 | 633 | Depending on the size of the compression data structures selected by 634 | deflateInit or deflateInit2, a part of the dictionary may in effect be 635 | discarded, for example if the dictionary is larger than the window size 636 | provided in deflateInit or deflateInit2. Thus the strings most likely to be 637 | useful should be put at the end of the dictionary, not at the front. In 638 | addition, the current implementation of deflate will use at most the window 639 | size minus 262 bytes of the provided dictionary. 640 | 641 | Upon return of this function, strm->adler is set to the Adler-32 value 642 | of the dictionary; the decompressor may later use this value to determine 643 | which dictionary has been used by the compressor. (The Adler-32 value 644 | applies to the whole dictionary even if only a subset of the dictionary is 645 | actually used by the compressor.) If a raw deflate was requested, then the 646 | Adler-32 value is not computed and strm->adler is not set. 647 | 648 | deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a 649 | parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is 650 | inconsistent (for example if deflate has already been called for this stream 651 | or if not at a block boundary for raw deflate). deflateSetDictionary does 652 | not perform any compression: this will be done by deflate(). 653 | */ 654 | 655 | ZEXTERN int ZEXPORT deflateGetDictionary OF((z_streamp strm, 656 | Bytef *dictionary, 657 | uInt *dictLength)); 658 | /* 659 | Returns the sliding dictionary being maintained by deflate. dictLength is 660 | set to the number of bytes in the dictionary, and that many bytes are copied 661 | to dictionary. dictionary must have enough space, where 32768 bytes is 662 | always enough. If deflateGetDictionary() is called with dictionary equal to 663 | Z_NULL, then only the dictionary length is returned, and nothing is copied. 664 | Similary, if dictLength is Z_NULL, then it is not set. 665 | 666 | deflateGetDictionary() may return a length less than the window size, even 667 | when more than the window size in input has been provided. It may return up 668 | to 258 bytes less in that case, due to how zlib's implementation of deflate 669 | manages the sliding window and lookahead for matches, where matches can be 670 | up to 258 bytes long. If the application needs the last window-size bytes of 671 | input, then that would need to be saved by the application outside of zlib. 672 | 673 | deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the 674 | stream state is inconsistent. 675 | */ 676 | 677 | ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, 678 | z_streamp source)); 679 | /* 680 | Sets the destination stream as a complete copy of the source stream. 681 | 682 | This function can be useful when several compression strategies will be 683 | tried, for example when there are several ways of pre-processing the input 684 | data with a filter. The streams that will be discarded should then be freed 685 | by calling deflateEnd. Note that deflateCopy duplicates the internal 686 | compression state which can be quite large, so this strategy is slow and can 687 | consume lots of memory. 688 | 689 | deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 690 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 691 | (such as zalloc being Z_NULL). msg is left unchanged in both source and 692 | destination. 693 | */ 694 | 695 | ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); 696 | /* 697 | This function is equivalent to deflateEnd followed by deflateInit, but 698 | does not free and reallocate the internal compression state. The stream 699 | will leave the compression level and any other attributes that may have been 700 | set unchanged. 701 | 702 | deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 703 | stream state was inconsistent (such as zalloc or state being Z_NULL). 704 | */ 705 | 706 | ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, 707 | int level, 708 | int strategy)); 709 | /* 710 | Dynamically update the compression level and compression strategy. The 711 | interpretation of level and strategy is as in deflateInit2(). This can be 712 | used to switch between compression and straight copy of the input data, or 713 | to switch to a different kind of input data requiring a different strategy. 714 | If the compression approach (which is a function of the level) or the 715 | strategy is changed, and if any input has been consumed in a previous 716 | deflate() call, then the input available so far is compressed with the old 717 | level and strategy using deflate(strm, Z_BLOCK). There are three approaches 718 | for the compression levels 0, 1..3, and 4..9 respectively. The new level 719 | and strategy will take effect at the next call of deflate(). 720 | 721 | If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does 722 | not have enough output space to complete, then the parameter change will not 723 | take effect. In this case, deflateParams() can be called again with the 724 | same parameters and more output space to try again. 725 | 726 | In order to assure a change in the parameters on the first try, the 727 | deflate stream should be flushed using deflate() with Z_BLOCK or other flush 728 | request until strm.avail_out is not zero, before calling deflateParams(). 729 | Then no more input data should be provided before the deflateParams() call. 730 | If this is done, the old level and strategy will be applied to the data 731 | compressed before deflateParams(), and the new level and strategy will be 732 | applied to the the data compressed after deflateParams(). 733 | 734 | deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream 735 | state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if 736 | there was not enough output space to complete the compression of the 737 | available input data before a change in the strategy or approach. Note that 738 | in the case of a Z_BUF_ERROR, the parameters are not changed. A return 739 | value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be 740 | retried with more output space. 741 | */ 742 | 743 | ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, 744 | int good_length, 745 | int max_lazy, 746 | int nice_length, 747 | int max_chain)); 748 | /* 749 | Fine tune deflate's internal compression parameters. This should only be 750 | used by someone who understands the algorithm used by zlib's deflate for 751 | searching for the best matching string, and even then only by the most 752 | fanatic optimizer trying to squeeze out the last compressed bit for their 753 | specific input data. Read the deflate.c source code for the meaning of the 754 | max_lazy, good_length, nice_length, and max_chain parameters. 755 | 756 | deflateTune() can be called after deflateInit() or deflateInit2(), and 757 | returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. 758 | */ 759 | 760 | ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, 761 | uLong sourceLen)); 762 | /* 763 | deflateBound() returns an upper bound on the compressed size after 764 | deflation of sourceLen bytes. It must be called after deflateInit() or 765 | deflateInit2(), and after deflateSetHeader(), if used. This would be used 766 | to allocate an output buffer for deflation in a single pass, and so would be 767 | called before deflate(). If that first deflate() call is provided the 768 | sourceLen input bytes, an output buffer allocated to the size returned by 769 | deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed 770 | to return Z_STREAM_END. Note that it is possible for the compressed size to 771 | be larger than the value returned by deflateBound() if flush options other 772 | than Z_FINISH or Z_NO_FLUSH are used. 773 | */ 774 | 775 | ZEXTERN int ZEXPORT deflatePending OF((z_streamp strm, 776 | unsigned *pending, 777 | int *bits)); 778 | /* 779 | deflatePending() returns the number of bytes and bits of output that have 780 | been generated, but not yet provided in the available output. The bytes not 781 | provided would be due to the available output space having being consumed. 782 | The number of bits of output not provided are between 0 and 7, where they 783 | await more bits to join them in order to fill out a full byte. If pending 784 | or bits are Z_NULL, then those values are not set. 785 | 786 | deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source 787 | stream state was inconsistent. 788 | */ 789 | 790 | ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, 791 | int bits, 792 | int value)); 793 | /* 794 | deflatePrime() inserts bits in the deflate output stream. The intent 795 | is that this function is used to start off the deflate output with the bits 796 | leftover from a previous deflate stream when appending to it. As such, this 797 | function can only be used for raw deflate, and must be used before the first 798 | deflate() call after a deflateInit2() or deflateReset(). bits must be less 799 | than or equal to 16, and that many of the least significant bits of value 800 | will be inserted in the output. 801 | 802 | deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough 803 | room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the 804 | source stream state was inconsistent. 805 | */ 806 | 807 | ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, 808 | gz_headerp head)); 809 | /* 810 | deflateSetHeader() provides gzip header information for when a gzip 811 | stream is requested by deflateInit2(). deflateSetHeader() may be called 812 | after deflateInit2() or deflateReset() and before the first call of 813 | deflate(). The text, time, os, extra field, name, and comment information 814 | in the provided gz_header structure are written to the gzip header (xflag is 815 | ignored -- the extra flags are set according to the compression level). The 816 | caller must assure that, if not Z_NULL, name and comment are terminated with 817 | a zero byte, and that if extra is not Z_NULL, that extra_len bytes are 818 | available there. If hcrc is true, a gzip header crc is included. Note that 819 | the current versions of the command-line version of gzip (up through version 820 | 1.3.x) do not support header crc's, and will report that it is a "multi-part 821 | gzip file" and give up. 822 | 823 | If deflateSetHeader is not used, the default gzip header has text false, 824 | the time set to zero, and os set to 255, with no extra, name, or comment 825 | fields. The gzip header is returned to the default state by deflateReset(). 826 | 827 | deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 828 | stream state was inconsistent. 829 | */ 830 | 831 | /* 832 | ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, 833 | int windowBits)); 834 | 835 | This is another version of inflateInit with an extra parameter. The 836 | fields next_in, avail_in, zalloc, zfree and opaque must be initialized 837 | before by the caller. 838 | 839 | The windowBits parameter is the base two logarithm of the maximum window 840 | size (the size of the history buffer). It should be in the range 8..15 for 841 | this version of the library. The default value is 15 if inflateInit is used 842 | instead. windowBits must be greater than or equal to the windowBits value 843 | provided to deflateInit2() while compressing, or it must be equal to 15 if 844 | deflateInit2() was not used. If a compressed stream with a larger window 845 | size is given as input, inflate() will return with the error code 846 | Z_DATA_ERROR instead of trying to allocate a larger window. 847 | 848 | windowBits can also be zero to request that inflate use the window size in 849 | the zlib header of the compressed stream. 850 | 851 | windowBits can also be -8..-15 for raw inflate. In this case, -windowBits 852 | determines the window size. inflate() will then process raw deflate data, 853 | not looking for a zlib or gzip header, not generating a check value, and not 854 | looking for any check values for comparison at the end of the stream. This 855 | is for use with other formats that use the deflate compressed data format 856 | such as zip. Those formats provide their own check values. If a custom 857 | format is developed using the raw deflate format for compressed data, it is 858 | recommended that a check value such as an Adler-32 or a CRC-32 be applied to 859 | the uncompressed data as is done in the zlib, gzip, and zip formats. For 860 | most applications, the zlib format should be used as is. Note that comments 861 | above on the use in deflateInit2() applies to the magnitude of windowBits. 862 | 863 | windowBits can also be greater than 15 for optional gzip decoding. Add 864 | 32 to windowBits to enable zlib and gzip decoding with automatic header 865 | detection, or add 16 to decode only the gzip format (the zlib format will 866 | return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a 867 | CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see 868 | below), inflate() will not automatically decode concatenated gzip streams. 869 | inflate() will return Z_STREAM_END at the end of the gzip stream. The state 870 | would need to be reset to continue decoding a subsequent gzip stream. 871 | 872 | inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 873 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the 874 | version assumed by the caller, or Z_STREAM_ERROR if the parameters are 875 | invalid, such as a null pointer to the structure. msg is set to null if 876 | there is no error message. inflateInit2 does not perform any decompression 877 | apart from possibly reading the zlib header if present: actual decompression 878 | will be done by inflate(). (So next_in and avail_in may be modified, but 879 | next_out and avail_out are unused and unchanged.) The current implementation 880 | of inflateInit2() does not process any header information -- that is 881 | deferred until inflate() is called. 882 | */ 883 | 884 | ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, 885 | const Bytef *dictionary, 886 | uInt dictLength)); 887 | /* 888 | Initializes the decompression dictionary from the given uncompressed byte 889 | sequence. This function must be called immediately after a call of inflate, 890 | if that call returned Z_NEED_DICT. The dictionary chosen by the compressor 891 | can be determined from the Adler-32 value returned by that call of inflate. 892 | The compressor and decompressor must use exactly the same dictionary (see 893 | deflateSetDictionary). For raw inflate, this function can be called at any 894 | time to set the dictionary. If the provided dictionary is smaller than the 895 | window and there is already data in the window, then the provided dictionary 896 | will amend what's there. The application must insure that the dictionary 897 | that was used for compression is provided. 898 | 899 | inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a 900 | parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is 901 | inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the 902 | expected one (incorrect Adler-32 value). inflateSetDictionary does not 903 | perform any decompression: this will be done by subsequent calls of 904 | inflate(). 905 | */ 906 | 907 | ZEXTERN int ZEXPORT inflateGetDictionary OF((z_streamp strm, 908 | Bytef *dictionary, 909 | uInt *dictLength)); 910 | /* 911 | Returns the sliding dictionary being maintained by inflate. dictLength is 912 | set to the number of bytes in the dictionary, and that many bytes are copied 913 | to dictionary. dictionary must have enough space, where 32768 bytes is 914 | always enough. If inflateGetDictionary() is called with dictionary equal to 915 | Z_NULL, then only the dictionary length is returned, and nothing is copied. 916 | Similary, if dictLength is Z_NULL, then it is not set. 917 | 918 | inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the 919 | stream state is inconsistent. 920 | */ 921 | 922 | ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); 923 | /* 924 | Skips invalid compressed data until a possible full flush point (see above 925 | for the description of deflate with Z_FULL_FLUSH) can be found, or until all 926 | available input is skipped. No output is provided. 927 | 928 | inflateSync searches for a 00 00 FF FF pattern in the compressed data. 929 | All full flush points have this pattern, but not all occurrences of this 930 | pattern are full flush points. 931 | 932 | inflateSync returns Z_OK if a possible full flush point has been found, 933 | Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point 934 | has been found, or Z_STREAM_ERROR if the stream structure was inconsistent. 935 | In the success case, the application may save the current current value of 936 | total_in which indicates where valid compressed data was found. In the 937 | error case, the application may repeatedly call inflateSync, providing more 938 | input each time, until success or end of the input data. 939 | */ 940 | 941 | ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, 942 | z_streamp source)); 943 | /* 944 | Sets the destination stream as a complete copy of the source stream. 945 | 946 | This function can be useful when randomly accessing a large stream. The 947 | first pass through the stream can periodically record the inflate state, 948 | allowing restarting inflate at those points when randomly accessing the 949 | stream. 950 | 951 | inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not 952 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent 953 | (such as zalloc being Z_NULL). msg is left unchanged in both source and 954 | destination. 955 | */ 956 | 957 | ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); 958 | /* 959 | This function is equivalent to inflateEnd followed by inflateInit, 960 | but does not free and reallocate the internal decompression state. The 961 | stream will keep attributes that may have been set by inflateInit2. 962 | 963 | inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source 964 | stream state was inconsistent (such as zalloc or state being Z_NULL). 965 | */ 966 | 967 | ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm, 968 | int windowBits)); 969 | /* 970 | This function is the same as inflateReset, but it also permits changing 971 | the wrap and window size requests. The windowBits parameter is interpreted 972 | the same as it is for inflateInit2. If the window size is changed, then the 973 | memory allocated for the window is freed, and the window will be reallocated 974 | by inflate() if needed. 975 | 976 | inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source 977 | stream state was inconsistent (such as zalloc or state being Z_NULL), or if 978 | the windowBits parameter is invalid. 979 | */ 980 | 981 | ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, 982 | int bits, 983 | int value)); 984 | /* 985 | This function inserts bits in the inflate input stream. The intent is 986 | that this function is used to start inflating at a bit position in the 987 | middle of a byte. The provided bits will be used before any bytes are used 988 | from next_in. This function should only be used with raw inflate, and 989 | should be used before the first inflate() call after inflateInit2() or 990 | inflateReset(). bits must be less than or equal to 16, and that many of the 991 | least significant bits of value will be inserted in the input. 992 | 993 | If bits is negative, then the input stream bit buffer is emptied. Then 994 | inflatePrime() can be called again to put bits in the buffer. This is used 995 | to clear out bits leftover after feeding inflate a block description prior 996 | to feeding inflate codes. 997 | 998 | inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source 999 | stream state was inconsistent. 1000 | */ 1001 | 1002 | ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm)); 1003 | /* 1004 | This function returns two values, one in the lower 16 bits of the return 1005 | value, and the other in the remaining upper bits, obtained by shifting the 1006 | return value down 16 bits. If the upper value is -1 and the lower value is 1007 | zero, then inflate() is currently decoding information outside of a block. 1008 | If the upper value is -1 and the lower value is non-zero, then inflate is in 1009 | the middle of a stored block, with the lower value equaling the number of 1010 | bytes from the input remaining to copy. If the upper value is not -1, then 1011 | it is the number of bits back from the current bit position in the input of 1012 | the code (literal or length/distance pair) currently being processed. In 1013 | that case the lower value is the number of bytes already emitted for that 1014 | code. 1015 | 1016 | A code is being processed if inflate is waiting for more input to complete 1017 | decoding of the code, or if it has completed decoding but is waiting for 1018 | more output space to write the literal or match data. 1019 | 1020 | inflateMark() is used to mark locations in the input data for random 1021 | access, which may be at bit positions, and to note those cases where the 1022 | output of a code may span boundaries of random access blocks. The current 1023 | location in the input stream can be determined from avail_in and data_type 1024 | as noted in the description for the Z_BLOCK flush parameter for inflate. 1025 | 1026 | inflateMark returns the value noted above, or -65536 if the provided 1027 | source stream state was inconsistent. 1028 | */ 1029 | 1030 | ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, 1031 | gz_headerp head)); 1032 | /* 1033 | inflateGetHeader() requests that gzip header information be stored in the 1034 | provided gz_header structure. inflateGetHeader() may be called after 1035 | inflateInit2() or inflateReset(), and before the first call of inflate(). 1036 | As inflate() processes the gzip stream, head->done is zero until the header 1037 | is completed, at which time head->done is set to one. If a zlib stream is 1038 | being decoded, then head->done is set to -1 to indicate that there will be 1039 | no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be 1040 | used to force inflate() to return immediately after header processing is 1041 | complete and before any actual data is decompressed. 1042 | 1043 | The text, time, xflags, and os fields are filled in with the gzip header 1044 | contents. hcrc is set to true if there is a header CRC. (The header CRC 1045 | was valid if done is set to one.) If extra is not Z_NULL, then extra_max 1046 | contains the maximum number of bytes to write to extra. Once done is true, 1047 | extra_len contains the actual extra field length, and extra contains the 1048 | extra field, or that field truncated if extra_max is less than extra_len. 1049 | If name is not Z_NULL, then up to name_max characters are written there, 1050 | terminated with a zero unless the length is greater than name_max. If 1051 | comment is not Z_NULL, then up to comm_max characters are written there, 1052 | terminated with a zero unless the length is greater than comm_max. When any 1053 | of extra, name, or comment are not Z_NULL and the respective field is not 1054 | present in the header, then that field is set to Z_NULL to signal its 1055 | absence. This allows the use of deflateSetHeader() with the returned 1056 | structure to duplicate the header. However if those fields are set to 1057 | allocated memory, then the application will need to save those pointers 1058 | elsewhere so that they can be eventually freed. 1059 | 1060 | If inflateGetHeader is not used, then the header information is simply 1061 | discarded. The header is always checked for validity, including the header 1062 | CRC if present. inflateReset() will reset the process to discard the header 1063 | information. The application would need to call inflateGetHeader() again to 1064 | retrieve the header from the next gzip stream. 1065 | 1066 | inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source 1067 | stream state was inconsistent. 1068 | */ 1069 | 1070 | /* 1071 | ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, 1072 | unsigned char FAR *window)); 1073 | 1074 | Initialize the internal stream state for decompression using inflateBack() 1075 | calls. The fields zalloc, zfree and opaque in strm must be initialized 1076 | before the call. If zalloc and zfree are Z_NULL, then the default library- 1077 | derived memory allocation routines are used. windowBits is the base two 1078 | logarithm of the window size, in the range 8..15. window is a caller 1079 | supplied buffer of that size. Except for special applications where it is 1080 | assured that deflate was used with small window sizes, windowBits must be 15 1081 | and a 32K byte window must be supplied to be able to decompress general 1082 | deflate streams. 1083 | 1084 | See inflateBack() for the usage of these routines. 1085 | 1086 | inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of 1087 | the parameters are invalid, Z_MEM_ERROR if the internal state could not be 1088 | allocated, or Z_VERSION_ERROR if the version of the library does not match 1089 | the version of the header file. 1090 | */ 1091 | 1092 | typedef unsigned (*in_func) OF((void FAR *, 1093 | z_const unsigned char FAR * FAR *)); 1094 | typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); 1095 | 1096 | ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, 1097 | in_func in, void FAR *in_desc, 1098 | out_func out, void FAR *out_desc)); 1099 | /* 1100 | inflateBack() does a raw inflate with a single call using a call-back 1101 | interface for input and output. This is potentially more efficient than 1102 | inflate() for file i/o applications, in that it avoids copying between the 1103 | output and the sliding window by simply making the window itself the output 1104 | buffer. inflate() can be faster on modern CPUs when used with large 1105 | buffers. inflateBack() trusts the application to not change the output 1106 | buffer passed by the output function, at least until inflateBack() returns. 1107 | 1108 | inflateBackInit() must be called first to allocate the internal state 1109 | and to initialize the state with the user-provided window buffer. 1110 | inflateBack() may then be used multiple times to inflate a complete, raw 1111 | deflate stream with each call. inflateBackEnd() is then called to free the 1112 | allocated state. 1113 | 1114 | A raw deflate stream is one with no zlib or gzip header or trailer. 1115 | This routine would normally be used in a utility that reads zip or gzip 1116 | files and writes out uncompressed files. The utility would decode the 1117 | header and process the trailer on its own, hence this routine expects only 1118 | the raw deflate stream to decompress. This is different from the default 1119 | behavior of inflate(), which expects a zlib header and trailer around the 1120 | deflate stream. 1121 | 1122 | inflateBack() uses two subroutines supplied by the caller that are then 1123 | called by inflateBack() for input and output. inflateBack() calls those 1124 | routines until it reads a complete deflate stream and writes out all of the 1125 | uncompressed data, or until it encounters an error. The function's 1126 | parameters and return types are defined above in the in_func and out_func 1127 | typedefs. inflateBack() will call in(in_desc, &buf) which should return the 1128 | number of bytes of provided input, and a pointer to that input in buf. If 1129 | there is no input available, in() must return zero -- buf is ignored in that 1130 | case -- and inflateBack() will return a buffer error. inflateBack() will 1131 | call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. 1132 | out() should return zero on success, or non-zero on failure. If out() 1133 | returns non-zero, inflateBack() will return with an error. Neither in() nor 1134 | out() are permitted to change the contents of the window provided to 1135 | inflateBackInit(), which is also the buffer that out() uses to write from. 1136 | The length written by out() will be at most the window size. Any non-zero 1137 | amount of input may be provided by in(). 1138 | 1139 | For convenience, inflateBack() can be provided input on the first call by 1140 | setting strm->next_in and strm->avail_in. If that input is exhausted, then 1141 | in() will be called. Therefore strm->next_in must be initialized before 1142 | calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called 1143 | immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in 1144 | must also be initialized, and then if strm->avail_in is not zero, input will 1145 | initially be taken from strm->next_in[0 .. strm->avail_in - 1]. 1146 | 1147 | The in_desc and out_desc parameters of inflateBack() is passed as the 1148 | first parameter of in() and out() respectively when they are called. These 1149 | descriptors can be optionally used to pass any information that the caller- 1150 | supplied in() and out() functions need to do their job. 1151 | 1152 | On return, inflateBack() will set strm->next_in and strm->avail_in to 1153 | pass back any unused input that was provided by the last in() call. The 1154 | return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR 1155 | if in() or out() returned an error, Z_DATA_ERROR if there was a format error 1156 | in the deflate stream (in which case strm->msg is set to indicate the nature 1157 | of the error), or Z_STREAM_ERROR if the stream was not properly initialized. 1158 | In the case of Z_BUF_ERROR, an input or output error can be distinguished 1159 | using strm->next_in which will be Z_NULL only if in() returned an error. If 1160 | strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning 1161 | non-zero. (in() will always be called before out(), so strm->next_in is 1162 | assured to be defined if out() returns non-zero.) Note that inflateBack() 1163 | cannot return Z_OK. 1164 | */ 1165 | 1166 | ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); 1167 | /* 1168 | All memory allocated by inflateBackInit() is freed. 1169 | 1170 | inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream 1171 | state was inconsistent. 1172 | */ 1173 | 1174 | ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); 1175 | /* Return flags indicating compile-time options. 1176 | 1177 | Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: 1178 | 1.0: size of uInt 1179 | 3.2: size of uLong 1180 | 5.4: size of voidpf (pointer) 1181 | 7.6: size of z_off_t 1182 | 1183 | Compiler, assembler, and debug options: 1184 | 8: ZLIB_DEBUG 1185 | 9: ASMV or ASMINF -- use ASM code 1186 | 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention 1187 | 11: 0 (reserved) 1188 | 1189 | One-time table building (smaller code, but not thread-safe if true): 1190 | 12: BUILDFIXED -- build static block decoding tables when needed 1191 | 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed 1192 | 14,15: 0 (reserved) 1193 | 1194 | Library content (indicates missing functionality): 1195 | 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking 1196 | deflate code when not needed) 1197 | 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect 1198 | and decode gzip streams (to avoid linking crc code) 1199 | 18-19: 0 (reserved) 1200 | 1201 | Operation variations (changes in library functionality): 1202 | 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate 1203 | 21: FASTEST -- deflate algorithm with only one, lowest compression level 1204 | 22,23: 0 (reserved) 1205 | 1206 | The sprintf variant used by gzprintf (zero is best): 1207 | 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format 1208 | 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! 1209 | 26: 0 = returns value, 1 = void -- 1 means inferred string length returned 1210 | 1211 | Remainder: 1212 | 27-31: 0 (reserved) 1213 | */ 1214 | 1215 | #ifndef Z_SOLO 1216 | 1217 | /* utility functions */ 1218 | 1219 | /* 1220 | The following utility functions are implemented on top of the basic 1221 | stream-oriented functions. To simplify the interface, some default options 1222 | are assumed (compression level and memory usage, standard memory allocation 1223 | functions). The source code of these utility functions can be modified if 1224 | you need special options. 1225 | */ 1226 | 1227 | ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, 1228 | const Bytef *source, uLong sourceLen)); 1229 | /* 1230 | Compresses the source buffer into the destination buffer. sourceLen is 1231 | the byte length of the source buffer. Upon entry, destLen is the total size 1232 | of the destination buffer, which must be at least the value returned by 1233 | compressBound(sourceLen). Upon exit, destLen is the actual size of the 1234 | compressed data. compress() is equivalent to compress2() with a level 1235 | parameter of Z_DEFAULT_COMPRESSION. 1236 | 1237 | compress returns Z_OK if success, Z_MEM_ERROR if there was not 1238 | enough memory, Z_BUF_ERROR if there was not enough room in the output 1239 | buffer. 1240 | */ 1241 | 1242 | ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, 1243 | const Bytef *source, uLong sourceLen, 1244 | int level)); 1245 | /* 1246 | Compresses the source buffer into the destination buffer. The level 1247 | parameter has the same meaning as in deflateInit. sourceLen is the byte 1248 | length of the source buffer. Upon entry, destLen is the total size of the 1249 | destination buffer, which must be at least the value returned by 1250 | compressBound(sourceLen). Upon exit, destLen is the actual size of the 1251 | compressed data. 1252 | 1253 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough 1254 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, 1255 | Z_STREAM_ERROR if the level parameter is invalid. 1256 | */ 1257 | 1258 | ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); 1259 | /* 1260 | compressBound() returns an upper bound on the compressed size after 1261 | compress() or compress2() on sourceLen bytes. It would be used before a 1262 | compress() or compress2() call to allocate the destination buffer. 1263 | */ 1264 | 1265 | ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, 1266 | const Bytef *source, uLong sourceLen)); 1267 | /* 1268 | Decompresses the source buffer into the destination buffer. sourceLen is 1269 | the byte length of the source buffer. Upon entry, destLen is the total size 1270 | of the destination buffer, which must be large enough to hold the entire 1271 | uncompressed data. (The size of the uncompressed data must have been saved 1272 | previously by the compressor and transmitted to the decompressor by some 1273 | mechanism outside the scope of this compression library.) Upon exit, destLen 1274 | is the actual size of the uncompressed data. 1275 | 1276 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not 1277 | enough memory, Z_BUF_ERROR if there was not enough room in the output 1278 | buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. In 1279 | the case where there is not enough room, uncompress() will fill the output 1280 | buffer with the uncompressed data up to that point. 1281 | */ 1282 | 1283 | ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest, uLongf *destLen, 1284 | const Bytef *source, uLong *sourceLen)); 1285 | /* 1286 | Same as uncompress, except that sourceLen is a pointer, where the 1287 | length of the source is *sourceLen. On return, *sourceLen is the number of 1288 | source bytes consumed. 1289 | */ 1290 | 1291 | /* gzip file access functions */ 1292 | 1293 | /* 1294 | This library supports reading and writing files in gzip (.gz) format with 1295 | an interface similar to that of stdio, using the functions that start with 1296 | "gz". The gzip format is different from the zlib format. gzip is a gzip 1297 | wrapper, documented in RFC 1952, wrapped around a deflate stream. 1298 | */ 1299 | 1300 | typedef struct gzFile_s *gzFile; /* semi-opaque gzip file descriptor */ 1301 | 1302 | /* 1303 | ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); 1304 | 1305 | Opens a gzip (.gz) file for reading or writing. The mode parameter is as 1306 | in fopen ("rb" or "wb") but can also include a compression level ("wb9") or 1307 | a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only 1308 | compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F' 1309 | for fixed code compression as in "wb9F". (See the description of 1310 | deflateInit2 for more information about the strategy parameter.) 'T' will 1311 | request transparent writing or appending with no compression and not using 1312 | the gzip format. 1313 | 1314 | "a" can be used instead of "w" to request that the gzip stream that will 1315 | be written be appended to the file. "+" will result in an error, since 1316 | reading and writing to the same gzip file is not supported. The addition of 1317 | "x" when writing will create the file exclusively, which fails if the file 1318 | already exists. On systems that support it, the addition of "e" when 1319 | reading or writing will set the flag to close the file on an execve() call. 1320 | 1321 | These functions, as well as gzip, will read and decode a sequence of gzip 1322 | streams in a file. The append function of gzopen() can be used to create 1323 | such a file. (Also see gzflush() for another way to do this.) When 1324 | appending, gzopen does not test whether the file begins with a gzip stream, 1325 | nor does it look for the end of the gzip streams to begin appending. gzopen 1326 | will simply append a gzip stream to the existing file. 1327 | 1328 | gzopen can be used to read a file which is not in gzip format; in this 1329 | case gzread will directly read from the file without decompression. When 1330 | reading, this will be detected automatically by looking for the magic two- 1331 | byte gzip header. 1332 | 1333 | gzopen returns NULL if the file could not be opened, if there was 1334 | insufficient memory to allocate the gzFile state, or if an invalid mode was 1335 | specified (an 'r', 'w', or 'a' was not provided, or '+' was provided). 1336 | errno can be checked to determine if the reason gzopen failed was that the 1337 | file could not be opened. 1338 | */ 1339 | 1340 | ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); 1341 | /* 1342 | gzdopen associates a gzFile with the file descriptor fd. File descriptors 1343 | are obtained from calls like open, dup, creat, pipe or fileno (if the file 1344 | has been previously opened with fopen). The mode parameter is as in gzopen. 1345 | 1346 | The next call of gzclose on the returned gzFile will also close the file 1347 | descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor 1348 | fd. If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd, 1349 | mode);. The duplicated descriptor should be saved to avoid a leak, since 1350 | gzdopen does not close fd if it fails. If you are using fileno() to get the 1351 | file descriptor from a FILE *, then you will have to use dup() to avoid 1352 | double-close()ing the file descriptor. Both gzclose() and fclose() will 1353 | close the associated file descriptor, so they need to have different file 1354 | descriptors. 1355 | 1356 | gzdopen returns NULL if there was insufficient memory to allocate the 1357 | gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not 1358 | provided, or '+' was provided), or if fd is -1. The file descriptor is not 1359 | used until the next gz* read, write, seek, or close operation, so gzdopen 1360 | will not detect if fd is invalid (unless fd is -1). 1361 | */ 1362 | 1363 | ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size)); 1364 | /* 1365 | Set the internal buffer size used by this library's functions. The 1366 | default buffer size is 8192 bytes. This function must be called after 1367 | gzopen() or gzdopen(), and before any other calls that read or write the 1368 | file. The buffer memory allocation is always deferred to the first read or 1369 | write. Three times that size in buffer space is allocated. A larger buffer 1370 | size of, for example, 64K or 128K bytes will noticeably increase the speed 1371 | of decompression (reading). 1372 | 1373 | The new buffer size also affects the maximum length for gzprintf(). 1374 | 1375 | gzbuffer() returns 0 on success, or -1 on failure, such as being called 1376 | too late. 1377 | */ 1378 | 1379 | ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); 1380 | /* 1381 | Dynamically update the compression level or strategy. See the description 1382 | of deflateInit2 for the meaning of these parameters. Previously provided 1383 | data is flushed before the parameter change. 1384 | 1385 | gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not 1386 | opened for writing, Z_ERRNO if there is an error writing the flushed data, 1387 | or Z_MEM_ERROR if there is a memory allocation error. 1388 | */ 1389 | 1390 | ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); 1391 | /* 1392 | Reads the given number of uncompressed bytes from the compressed file. If 1393 | the input file is not in gzip format, gzread copies the given number of 1394 | bytes into the buffer directly from the file. 1395 | 1396 | After reaching the end of a gzip stream in the input, gzread will continue 1397 | to read, looking for another gzip stream. Any number of gzip streams may be 1398 | concatenated in the input file, and will all be decompressed by gzread(). 1399 | If something other than a gzip stream is encountered after a gzip stream, 1400 | that remaining trailing garbage is ignored (and no error is returned). 1401 | 1402 | gzread can be used to read a gzip file that is being concurrently written. 1403 | Upon reaching the end of the input, gzread will return with the available 1404 | data. If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then 1405 | gzclearerr can be used to clear the end of file indicator in order to permit 1406 | gzread to be tried again. Z_OK indicates that a gzip stream was completed 1407 | on the last gzread. Z_BUF_ERROR indicates that the input file ended in the 1408 | middle of a gzip stream. Note that gzread does not return -1 in the event 1409 | of an incomplete gzip stream. This error is deferred until gzclose(), which 1410 | will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip 1411 | stream. Alternatively, gzerror can be used before gzclose to detect this 1412 | case. 1413 | 1414 | gzread returns the number of uncompressed bytes actually read, less than 1415 | len for end of file, or -1 for error. If len is too large to fit in an int, 1416 | then nothing is read, -1 is returned, and the error state is set to 1417 | Z_STREAM_ERROR. 1418 | */ 1419 | 1420 | ZEXTERN z_size_t ZEXPORT gzfread OF((voidp buf, z_size_t size, z_size_t nitems, 1421 | gzFile file)); 1422 | /* 1423 | Read up to nitems items of size size from file to buf, otherwise operating 1424 | as gzread() does. This duplicates the interface of stdio's fread(), with 1425 | size_t request and return types. If the library defines size_t, then 1426 | z_size_t is identical to size_t. If not, then z_size_t is an unsigned 1427 | integer type that can contain a pointer. 1428 | 1429 | gzfread() returns the number of full items read of size size, or zero if 1430 | the end of the file was reached and a full item could not be read, or if 1431 | there was an error. gzerror() must be consulted if zero is returned in 1432 | order to determine if there was an error. If the multiplication of size and 1433 | nitems overflows, i.e. the product does not fit in a z_size_t, then nothing 1434 | is read, zero is returned, and the error state is set to Z_STREAM_ERROR. 1435 | 1436 | In the event that the end of file is reached and only a partial item is 1437 | available at the end, i.e. the remaining uncompressed data length is not a 1438 | multiple of size, then the final partial item is nevetheless read into buf 1439 | and the end-of-file flag is set. The length of the partial item read is not 1440 | provided, but could be inferred from the result of gztell(). This behavior 1441 | is the same as the behavior of fread() implementations in common libraries, 1442 | but it prevents the direct use of gzfread() to read a concurrently written 1443 | file, reseting and retrying on end-of-file, when size is not 1. 1444 | */ 1445 | 1446 | ZEXTERN int ZEXPORT gzwrite OF((gzFile file, 1447 | voidpc buf, unsigned len)); 1448 | /* 1449 | Writes the given number of uncompressed bytes into the compressed file. 1450 | gzwrite returns the number of uncompressed bytes written or 0 in case of 1451 | error. 1452 | */ 1453 | 1454 | ZEXTERN z_size_t ZEXPORT gzfwrite OF((voidpc buf, z_size_t size, 1455 | z_size_t nitems, gzFile file)); 1456 | /* 1457 | gzfwrite() writes nitems items of size size from buf to file, duplicating 1458 | the interface of stdio's fwrite(), with size_t request and return types. If 1459 | the library defines size_t, then z_size_t is identical to size_t. If not, 1460 | then z_size_t is an unsigned integer type that can contain a pointer. 1461 | 1462 | gzfwrite() returns the number of full items written of size size, or zero 1463 | if there was an error. If the multiplication of size and nitems overflows, 1464 | i.e. the product does not fit in a z_size_t, then nothing is written, zero 1465 | is returned, and the error state is set to Z_STREAM_ERROR. 1466 | */ 1467 | 1468 | ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...)); 1469 | /* 1470 | Converts, formats, and writes the arguments to the compressed file under 1471 | control of the format string, as in fprintf. gzprintf returns the number of 1472 | uncompressed bytes actually written, or a negative zlib error code in case 1473 | of error. The number of uncompressed bytes written is limited to 8191, or 1474 | one less than the buffer size given to gzbuffer(). The caller should assure 1475 | that this limit is not exceeded. If it is exceeded, then gzprintf() will 1476 | return an error (0) with nothing written. In this case, there may also be a 1477 | buffer overflow with unpredictable consequences, which is possible only if 1478 | zlib was compiled with the insecure functions sprintf() or vsprintf() 1479 | because the secure snprintf() or vsnprintf() functions were not available. 1480 | This can be determined using zlibCompileFlags(). 1481 | */ 1482 | 1483 | ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); 1484 | /* 1485 | Writes the given null-terminated string to the compressed file, excluding 1486 | the terminating null character. 1487 | 1488 | gzputs returns the number of characters written, or -1 in case of error. 1489 | */ 1490 | 1491 | ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); 1492 | /* 1493 | Reads bytes from the compressed file until len-1 characters are read, or a 1494 | newline character is read and transferred to buf, or an end-of-file 1495 | condition is encountered. If any characters are read or if len == 1, the 1496 | string is terminated with a null character. If no characters are read due 1497 | to an end-of-file or len < 1, then the buffer is left untouched. 1498 | 1499 | gzgets returns buf which is a null-terminated string, or it returns NULL 1500 | for end-of-file or in case of error. If there was an error, the contents at 1501 | buf are indeterminate. 1502 | */ 1503 | 1504 | ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); 1505 | /* 1506 | Writes c, converted to an unsigned char, into the compressed file. gzputc 1507 | returns the value that was written, or -1 in case of error. 1508 | */ 1509 | 1510 | ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); 1511 | /* 1512 | Reads one byte from the compressed file. gzgetc returns this byte or -1 1513 | in case of end of file or error. This is implemented as a macro for speed. 1514 | As such, it does not do all of the checking the other functions do. I.e. 1515 | it does not check to see if file is NULL, nor whether the structure file 1516 | points to has been clobbered or not. 1517 | */ 1518 | 1519 | ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); 1520 | /* 1521 | Push one character back onto the stream to be read as the first character 1522 | on the next read. At least one character of push-back is allowed. 1523 | gzungetc() returns the character pushed, or -1 on failure. gzungetc() will 1524 | fail if c is -1, and may fail if a character has been pushed but not read 1525 | yet. If gzungetc is used immediately after gzopen or gzdopen, at least the 1526 | output buffer size of pushed characters is allowed. (See gzbuffer above.) 1527 | The pushed character will be discarded if the stream is repositioned with 1528 | gzseek() or gzrewind(). 1529 | */ 1530 | 1531 | ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); 1532 | /* 1533 | Flushes all pending output into the compressed file. The parameter flush 1534 | is as in the deflate() function. The return value is the zlib error number 1535 | (see function gzerror below). gzflush is only permitted when writing. 1536 | 1537 | If the flush parameter is Z_FINISH, the remaining data is written and the 1538 | gzip stream is completed in the output. If gzwrite() is called again, a new 1539 | gzip stream will be started in the output. gzread() is able to read such 1540 | concatenated gzip streams. 1541 | 1542 | gzflush should be called only when strictly necessary because it will 1543 | degrade compression if called too often. 1544 | */ 1545 | 1546 | /* 1547 | ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, 1548 | z_off_t offset, int whence)); 1549 | 1550 | Sets the starting position for the next gzread or gzwrite on the given 1551 | compressed file. The offset represents a number of bytes in the 1552 | uncompressed data stream. The whence parameter is defined as in lseek(2); 1553 | the value SEEK_END is not supported. 1554 | 1555 | If the file is opened for reading, this function is emulated but can be 1556 | extremely slow. If the file is opened for writing, only forward seeks are 1557 | supported; gzseek then compresses a sequence of zeroes up to the new 1558 | starting position. 1559 | 1560 | gzseek returns the resulting offset location as measured in bytes from 1561 | the beginning of the uncompressed stream, or -1 in case of error, in 1562 | particular if the file is opened for writing and the new starting position 1563 | would be before the current position. 1564 | */ 1565 | 1566 | ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); 1567 | /* 1568 | Rewinds the given file. This function is supported only for reading. 1569 | 1570 | gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) 1571 | */ 1572 | 1573 | /* 1574 | ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); 1575 | 1576 | Returns the starting position for the next gzread or gzwrite on the given 1577 | compressed file. This position represents a number of bytes in the 1578 | uncompressed data stream, and is zero when starting, even if appending or 1579 | reading a gzip stream from the middle of a file using gzdopen(). 1580 | 1581 | gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) 1582 | */ 1583 | 1584 | /* 1585 | ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file)); 1586 | 1587 | Returns the current offset in the file being read or written. This offset 1588 | includes the count of bytes that precede the gzip stream, for example when 1589 | appending or when using gzdopen() for reading. When reading, the offset 1590 | does not include as yet unused buffered input. This information can be used 1591 | for a progress indicator. On error, gzoffset() returns -1. 1592 | */ 1593 | 1594 | ZEXTERN int ZEXPORT gzeof OF((gzFile file)); 1595 | /* 1596 | Returns true (1) if the end-of-file indicator has been set while reading, 1597 | false (0) otherwise. Note that the end-of-file indicator is set only if the 1598 | read tried to go past the end of the input, but came up short. Therefore, 1599 | just like feof(), gzeof() may return false even if there is no more data to 1600 | read, in the event that the last read request was for the exact number of 1601 | bytes remaining in the input file. This will happen if the input file size 1602 | is an exact multiple of the buffer size. 1603 | 1604 | If gzeof() returns true, then the read functions will return no more data, 1605 | unless the end-of-file indicator is reset by gzclearerr() and the input file 1606 | has grown since the previous end of file was detected. 1607 | */ 1608 | 1609 | ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); 1610 | /* 1611 | Returns true (1) if file is being copied directly while reading, or false 1612 | (0) if file is a gzip stream being decompressed. 1613 | 1614 | If the input file is empty, gzdirect() will return true, since the input 1615 | does not contain a gzip stream. 1616 | 1617 | If gzdirect() is used immediately after gzopen() or gzdopen() it will 1618 | cause buffers to be allocated to allow reading the file to determine if it 1619 | is a gzip file. Therefore if gzbuffer() is used, it should be called before 1620 | gzdirect(). 1621 | 1622 | When writing, gzdirect() returns true (1) if transparent writing was 1623 | requested ("wT" for the gzopen() mode), or false (0) otherwise. (Note: 1624 | gzdirect() is not needed when writing. Transparent writing must be 1625 | explicitly requested, so the application already knows the answer. When 1626 | linking statically, using gzdirect() will include all of the zlib code for 1627 | gzip file reading and decompression, which may not be desired.) 1628 | */ 1629 | 1630 | ZEXTERN int ZEXPORT gzclose OF((gzFile file)); 1631 | /* 1632 | Flushes all pending output if necessary, closes the compressed file and 1633 | deallocates the (de)compression state. Note that once file is closed, you 1634 | cannot call gzerror with file, since its structures have been deallocated. 1635 | gzclose must not be called more than once on the same file, just as free 1636 | must not be called more than once on the same allocation. 1637 | 1638 | gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a 1639 | file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the 1640 | last read ended in the middle of a gzip stream, or Z_OK on success. 1641 | */ 1642 | 1643 | ZEXTERN int ZEXPORT gzclose_r OF((gzFile file)); 1644 | ZEXTERN int ZEXPORT gzclose_w OF((gzFile file)); 1645 | /* 1646 | Same as gzclose(), but gzclose_r() is only for use when reading, and 1647 | gzclose_w() is only for use when writing or appending. The advantage to 1648 | using these instead of gzclose() is that they avoid linking in zlib 1649 | compression or decompression code that is not used when only reading or only 1650 | writing respectively. If gzclose() is used, then both compression and 1651 | decompression code will be included the application when linking to a static 1652 | zlib library. 1653 | */ 1654 | 1655 | ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); 1656 | /* 1657 | Returns the error message for the last error which occurred on the given 1658 | compressed file. errnum is set to zlib error number. If an error occurred 1659 | in the file system and not in the compression library, errnum is set to 1660 | Z_ERRNO and the application may consult errno to get the exact error code. 1661 | 1662 | The application must not modify the returned string. Future calls to 1663 | this function may invalidate the previously returned string. If file is 1664 | closed, then the string previously returned by gzerror will no longer be 1665 | available. 1666 | 1667 | gzerror() should be used to distinguish errors from end-of-file for those 1668 | functions above that do not distinguish those cases in their return values. 1669 | */ 1670 | 1671 | ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); 1672 | /* 1673 | Clears the error and end-of-file flags for file. This is analogous to the 1674 | clearerr() function in stdio. This is useful for continuing to read a gzip 1675 | file that is being written concurrently. 1676 | */ 1677 | 1678 | #endif /* !Z_SOLO */ 1679 | 1680 | /* checksum functions */ 1681 | 1682 | /* 1683 | These functions are not related to compression but are exported 1684 | anyway because they might be useful in applications using the compression 1685 | library. 1686 | */ 1687 | 1688 | ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); 1689 | /* 1690 | Update a running Adler-32 checksum with the bytes buf[0..len-1] and 1691 | return the updated checksum. If buf is Z_NULL, this function returns the 1692 | required initial value for the checksum. 1693 | 1694 | An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed 1695 | much faster. 1696 | 1697 | Usage example: 1698 | 1699 | uLong adler = adler32(0L, Z_NULL, 0); 1700 | 1701 | while (read_buffer(buffer, length) != EOF) { 1702 | adler = adler32(adler, buffer, length); 1703 | } 1704 | if (adler != original_adler) error(); 1705 | */ 1706 | 1707 | ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf, 1708 | z_size_t len)); 1709 | /* 1710 | Same as adler32(), but with a size_t length. 1711 | */ 1712 | 1713 | /* 1714 | ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, 1715 | z_off_t len2)); 1716 | 1717 | Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 1718 | and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for 1719 | each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of 1720 | seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. Note 1721 | that the z_off_t type (like off_t) is a signed integer. If len2 is 1722 | negative, the result has no meaning or utility. 1723 | */ 1724 | 1725 | ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); 1726 | /* 1727 | Update a running CRC-32 with the bytes buf[0..len-1] and return the 1728 | updated CRC-32. If buf is Z_NULL, this function returns the required 1729 | initial value for the crc. Pre- and post-conditioning (one's complement) is 1730 | performed within this function so it shouldn't be done by the application. 1731 | 1732 | Usage example: 1733 | 1734 | uLong crc = crc32(0L, Z_NULL, 0); 1735 | 1736 | while (read_buffer(buffer, length) != EOF) { 1737 | crc = crc32(crc, buffer, length); 1738 | } 1739 | if (crc != original_crc) error(); 1740 | */ 1741 | 1742 | ZEXTERN uLong ZEXPORT crc32_z OF((uLong adler, const Bytef *buf, 1743 | z_size_t len)); 1744 | /* 1745 | Same as crc32(), but with a size_t length. 1746 | */ 1747 | 1748 | /* 1749 | ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); 1750 | 1751 | Combine two CRC-32 check values into one. For two sequences of bytes, 1752 | seq1 and seq2 with lengths len1 and len2, CRC-32 check values were 1753 | calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 1754 | check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and 1755 | len2. 1756 | */ 1757 | 1758 | 1759 | /* various hacks, don't look :) */ 1760 | 1761 | /* deflateInit and inflateInit are macros to allow checking the zlib version 1762 | * and the compiler's view of z_stream: 1763 | */ 1764 | ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, 1765 | const char *version, int stream_size)); 1766 | ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, 1767 | const char *version, int stream_size)); 1768 | ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, 1769 | int windowBits, int memLevel, 1770 | int strategy, const char *version, 1771 | int stream_size)); 1772 | ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, 1773 | const char *version, int stream_size)); 1774 | ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, 1775 | unsigned char FAR *window, 1776 | const char *version, 1777 | int stream_size)); 1778 | #ifdef Z_PREFIX_SET 1779 | # define z_deflateInit(strm, level) \ 1780 | deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) 1781 | # define z_inflateInit(strm) \ 1782 | inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) 1783 | # define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ 1784 | deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ 1785 | (strategy), ZLIB_VERSION, (int)sizeof(z_stream)) 1786 | # define z_inflateInit2(strm, windowBits) \ 1787 | inflateInit2_((strm), (windowBits), ZLIB_VERSION, \ 1788 | (int)sizeof(z_stream)) 1789 | # define z_inflateBackInit(strm, windowBits, window) \ 1790 | inflateBackInit_((strm), (windowBits), (window), \ 1791 | ZLIB_VERSION, (int)sizeof(z_stream)) 1792 | #else 1793 | # define deflateInit(strm, level) \ 1794 | deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) 1795 | # define inflateInit(strm) \ 1796 | inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) 1797 | # define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ 1798 | deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ 1799 | (strategy), ZLIB_VERSION, (int)sizeof(z_stream)) 1800 | # define inflateInit2(strm, windowBits) \ 1801 | inflateInit2_((strm), (windowBits), ZLIB_VERSION, \ 1802 | (int)sizeof(z_stream)) 1803 | # define inflateBackInit(strm, windowBits, window) \ 1804 | inflateBackInit_((strm), (windowBits), (window), \ 1805 | ZLIB_VERSION, (int)sizeof(z_stream)) 1806 | #endif 1807 | 1808 | #ifndef Z_SOLO 1809 | 1810 | /* gzgetc() macro and its supporting function and exposed data structure. Note 1811 | * that the real internal state is much larger than the exposed structure. 1812 | * This abbreviated structure exposes just enough for the gzgetc() macro. The 1813 | * user should not mess with these exposed elements, since their names or 1814 | * behavior could change in the future, perhaps even capriciously. They can 1815 | * only be used by the gzgetc() macro. You have been warned. 1816 | */ 1817 | struct gzFile_s { 1818 | unsigned have; 1819 | unsigned char *next; 1820 | z_off64_t pos; 1821 | }; 1822 | ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file)); /* backward compatibility */ 1823 | #ifdef Z_PREFIX_SET 1824 | # undef z_gzgetc 1825 | # define z_gzgetc(g) \ 1826 | ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g)) 1827 | #else 1828 | # define gzgetc(g) \ 1829 | ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g)) 1830 | #endif 1831 | 1832 | /* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or 1833 | * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if 1834 | * both are true, the application gets the *64 functions, and the regular 1835 | * functions are changed to 64 bits) -- in case these are set on systems 1836 | * without large file support, _LFS64_LARGEFILE must also be true 1837 | */ 1838 | #ifdef Z_LARGE64 1839 | ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 1840 | ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 1841 | ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 1842 | ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 1843 | ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t)); 1844 | ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t)); 1845 | #endif 1846 | 1847 | #if !defined(ZLIB_INTERNAL) && defined(Z_WANT64) 1848 | # ifdef Z_PREFIX_SET 1849 | # define z_gzopen z_gzopen64 1850 | # define z_gzseek z_gzseek64 1851 | # define z_gztell z_gztell64 1852 | # define z_gzoffset z_gzoffset64 1853 | # define z_adler32_combine z_adler32_combine64 1854 | # define z_crc32_combine z_crc32_combine64 1855 | # else 1856 | # define gzopen gzopen64 1857 | # define gzseek gzseek64 1858 | # define gztell gztell64 1859 | # define gzoffset gzoffset64 1860 | # define adler32_combine adler32_combine64 1861 | # define crc32_combine crc32_combine64 1862 | # endif 1863 | # ifndef Z_LARGE64 1864 | ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 1865 | ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int)); 1866 | ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile)); 1867 | ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile)); 1868 | ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t)); 1869 | ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t)); 1870 | # endif 1871 | #else 1872 | ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *)); 1873 | ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int)); 1874 | ZEXTERN z_off_t ZEXPORT gztell OF((gzFile)); 1875 | ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile)); 1876 | ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t)); 1877 | ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t)); 1878 | #endif 1879 | 1880 | #else /* Z_SOLO */ 1881 | 1882 | ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t)); 1883 | ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t)); 1884 | 1885 | #endif /* !Z_SOLO */ 1886 | 1887 | /* undocumented functions */ 1888 | ZEXTERN const char * ZEXPORT zError OF((int)); 1889 | ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp)); 1890 | ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table OF((void)); 1891 | ZEXTERN int ZEXPORT inflateUndermine OF((z_streamp, int)); 1892 | ZEXTERN int ZEXPORT inflateValidate OF((z_streamp, int)); 1893 | ZEXTERN unsigned long ZEXPORT inflateCodesUsed OF ((z_streamp)); 1894 | ZEXTERN int ZEXPORT inflateResetKeep OF((z_streamp)); 1895 | ZEXTERN int ZEXPORT deflateResetKeep OF((z_streamp)); 1896 | #if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(Z_SOLO) 1897 | ZEXTERN gzFile ZEXPORT gzopen_w OF((const wchar_t *path, 1898 | const char *mode)); 1899 | #endif 1900 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) 1901 | # ifndef Z_SOLO 1902 | ZEXTERN int ZEXPORTVA gzvprintf Z_ARG((gzFile file, 1903 | const char *format, 1904 | va_list va)); 1905 | # endif 1906 | #endif 1907 | 1908 | #ifdef __cplusplus 1909 | } 1910 | #endif 1911 | 1912 | #endif /* ZLIB_H */ 1913 | -------------------------------------------------------------------------------- /screw/zlib/lib/zlib.lib: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/screw/zlib/lib/zlib.lib 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-------------------------------------------------------------------------------- /screw/zlib/share/man/man3/zlib.3: -------------------------------------------------------------------------------- 1 | .TH ZLIB 3 "15 Jan 2017" 2 | .SH NAME 3 | zlib \- compression/decompression library 4 | .SH SYNOPSIS 5 | [see 6 | .I zlib.h 7 | for full description] 8 | .SH DESCRIPTION 9 | The 10 | .I zlib 11 | library is a general purpose data compression library. 12 | The code is thread safe, assuming that the standard library functions 13 | used are thread safe, such as memory allocation routines. 14 | It provides in-memory compression and decompression functions, 15 | including integrity checks of the uncompressed data. 16 | This version of the library supports only one compression method (deflation) 17 | but other algorithms may be added later 18 | with the same stream interface. 19 | .LP 20 | Compression can be done in a single step if the buffers are large enough 21 | or can be done by repeated calls of the compression function. 22 | In the latter case, 23 | the application must provide more input and/or consume the output 24 | (providing more output space) before each call. 25 | .LP 26 | The library also supports reading and writing files in 27 | .IR gzip (1) 28 | (.gz) format 29 | with an interface similar to that of stdio. 30 | .LP 31 | The library does not install any signal handler. 32 | The decoder checks the consistency of the compressed data, 33 | so the library should never crash even in the case of corrupted input. 34 | .LP 35 | All functions of the compression library are documented in the file 36 | .IR zlib.h . 37 | The distribution source includes examples of use of the library 38 | in the files 39 | .I test/example.c 40 | and 41 | .IR test/minigzip.c, 42 | as well as other examples in the 43 | .IR examples/ 44 | directory. 45 | .LP 46 | Changes to this version are documented in the file 47 | .I ChangeLog 48 | that accompanies the source. 49 | .LP 50 | .I zlib 51 | is built in to many languages and operating systems, including but not limited to 52 | Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go. 53 | .LP 54 | An experimental package to read and write files in the .zip format, 55 | written on top of 56 | .I zlib 57 | by Gilles Vollant (info@winimage.com), 58 | is available at: 59 | .IP 60 | http://www.winimage.com/zLibDll/minizip.html 61 | and also in the 62 | .I contrib/minizip 63 | directory of the main 64 | .I zlib 65 | source distribution. 66 | .SH "SEE ALSO" 67 | The 68 | .I zlib 69 | web site can be found at: 70 | .IP 71 | http://zlib.net/ 72 | .LP 73 | The data format used by the 74 | .I zlib 75 | library is described by RFC 76 | (Request for Comments) 1950 to 1952 in the files: 77 | .IP 78 | http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format) 79 | .br 80 | http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format) 81 | .br 82 | http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format) 83 | .LP 84 | Mark Nelson wrote an article about 85 | .I zlib 86 | for the Jan. 1997 issue of Dr. Dobb's Journal; 87 | a copy of the article is available at: 88 | .IP 89 | http://marknelson.us/1997/01/01/zlib-engine/ 90 | .SH "REPORTING PROBLEMS" 91 | Before reporting a problem, 92 | please check the 93 | .I zlib 94 | web site to verify that you have the latest version of 95 | .IR zlib ; 96 | otherwise, 97 | obtain the latest version and see if the problem still exists. 98 | Please read the 99 | .I zlib 100 | FAQ at: 101 | .IP 102 | http://zlib.net/zlib_faq.html 103 | .LP 104 | before asking for help. 105 | Send questions and/or comments to zlib@gzip.org, 106 | or (for the Windows DLL version) to Gilles Vollant (info@winimage.com). 107 | .SH AUTHORS AND LICENSE 108 | Version 1.2.11 109 | .LP 110 | Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler 111 | .LP 112 | This software is provided 'as-is', without any express or implied 113 | warranty. In no event will the authors be held liable for any damages 114 | arising from the use of this software. 115 | .LP 116 | Permission is granted to anyone to use this software for any purpose, 117 | including commercial applications, and to alter it and redistribute it 118 | freely, subject to the following restrictions: 119 | .LP 120 | .nr step 1 1 121 | .IP \n[step]. 3 122 | The origin of this software must not be misrepresented; you must not 123 | claim that you wrote the original software. If you use this software 124 | in a product, an acknowledgment in the product documentation would be 125 | appreciated but is not required. 126 | .IP \n+[step]. 127 | Altered source versions must be plainly marked as such, and must not be 128 | misrepresented as being the original software. 129 | .IP \n+[step]. 130 | This notice may not be removed or altered from any source distribution. 131 | .LP 132 | Jean-loup Gailly Mark Adler 133 | .br 134 | jloup@gzip.org madler@alumni.caltech.edu 135 | .LP 136 | The deflate format used by 137 | .I zlib 138 | was defined by Phil Katz. 139 | The deflate and 140 | .I zlib 141 | specifications were written by L. Peter Deutsch. 142 | Thanks to all the people who reported problems and suggested various 143 | improvements in 144 | .IR zlib ; 145 | who are too numerous to cite here. 146 | .LP 147 | UNIX manual page by R. P. C. Rodgers, 148 | U.S. National Library of Medicine (rodgers@nlm.nih.gov). 149 | .\" end of man page 150 | -------------------------------------------------------------------------------- /screw/zlib/share/pkgconfig/zlib.pc: -------------------------------------------------------------------------------- 1 | prefix=C:/Program Files (x86)/zlib 2 | exec_prefix=C:/Program Files (x86)/zlib 3 | libdir=C:/Program Files (x86)/zlib/lib 4 | sharedlibdir=C:/Program Files (x86)/zlib/lib 5 | includedir=C:/Program Files (x86)/zlib/include 6 | 7 | Name: zlib 8 | Description: zlib compression library 9 | Version: 1.2.11 10 | 11 | Requires: 12 | Libs: -L${libdir} -L${sharedlibdir} -lz 13 | Cflags: -I${includedir} 14 | -------------------------------------------------------------------------------- /test.php: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Slzdude/php_screw-decrypt/d4b33d0bfeb06c819e3bc78b9ea2197b39cbca26/test.php -------------------------------------------------------------------------------- /test.php.screw: -------------------------------------------------------------------------------- 1 | --------------------------------------------------------------------------------