├── .gitignore ├── LICENSE ├── README.markdown ├── setup.py └── zipstream.py /.gitignore: -------------------------------------------------------------------------------- 1 | *.py[cod] 2 | 3 | # C extensions 4 | *.so 5 | 6 | # Packages 7 | *.egg 8 | *.egg-info 9 | dist 10 | build 11 | eggs 12 | parts 13 | bin 14 | var 15 | sdist 16 | develop-eggs 17 | .installed.cfg 18 | lib 19 | lib64 20 | __pycache__ 21 | 22 | # Installer logs 23 | pip-log.txt 24 | 25 | # Unit test / coverage reports 26 | .coverage 27 | .tox 28 | nosetests.xml 29 | 30 | # Translations 31 | *.mo 32 | 33 | # Mr Developer 34 | .mr.developer.cfg 35 | .project 36 | .pydevproject 37 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.markdown: -------------------------------------------------------------------------------- 1 | 2 | # ZipStream 3 | 4 | zipstream.py is a zip archive generator based on zipfile.py. It was created to 5 | generate a zip file on-the-fly for download in a web.py (http://webpy.org/) 6 | application. This is beneficial for when you want to provide a downloadable 7 | archive of a large collection of regular files, which would be infeasible to 8 | generate the archive prior to downloading. 9 | 10 | The archive is generated as an iterator of strings, which, when joined, form 11 | the zip archive. For example, the following code snippet would write a zip 12 | archive containing files from 'path' to a normal file: 13 | 14 | ```python 15 | zf = open('zipfile.zip', 'wb') 16 | for data in ZipStream(path): 17 | zf.write(data) 18 | zf.close() 19 | ``` 20 | 21 | Since recent versions of web.py support returning iterators of strings to be 22 | sent to the browser, to download a dynamically generated archive, you could 23 | use something like this snippet: 24 | 25 | ```python 26 | def GET(self): 27 | path = '/path/to/dir/of/files' 28 | zip_filename = 'files.zip' 29 | web.header('Content-type' , 'application/zip') 30 | web.header('Content-Disposition', 'attachment; filename="%s"' % ( 31 | zip_filename,)) 32 | return ZipStream(path) 33 | ``` 34 | 35 | If the zlib module is available, ZipStream can generate compressed zip 36 | archives. 37 | 38 | ## Requirements 39 | 40 | * Python >=2.6 41 | 42 | ## License 43 | 44 | This library was created by SpiderOak, Inc. and is released under the GPLv3. 45 | Copyright 2008-2013 SpiderOak Inc. 46 | 47 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | 3 | from distutils.core import setup 4 | 5 | setup( 6 | name='zipstream', 7 | version='1.0.1', 8 | description='SpiderOak ZipStream Module', 9 | author='SpiderOak Team', 10 | author_email='code@spideroak.com', 11 | url='http://www.spideroak.com', 12 | py_modules=['zipstream'], 13 | ) 14 | -------------------------------------------------------------------------------- /zipstream.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | 3 | """ 4 | Iterable ZIP archive generator. 5 | 6 | Derived directly from zipfile.py 7 | """ 8 | import struct, os, time, sys 9 | import binascii 10 | 11 | try: 12 | import zlib # We may need its compression method 13 | except ImportError: 14 | zlib = None 15 | 16 | __all__ = ["ZIP_STORED", "ZIP_DEFLATED", "ZipStream"] 17 | 18 | 19 | ZIP64_LIMIT= (1 << 31) - 1 20 | 21 | # constants for Zip file compression methods 22 | ZIP_STORED = 0 23 | ZIP_DEFLATED = 8 24 | # Other ZIP compression methods not supported 25 | 26 | # Here are some struct module formats for reading headers 27 | structEndArchive = "<4s4H2lH" # 9 items, end of archive, 22 bytes 28 | stringEndArchive = "PK\005\006" # magic number for end of archive record 29 | structCentralDir = "<4s4B4HlLL5HLl"# 19 items, central directory, 46 bytes 30 | stringCentralDir = "PK\001\002" # magic number for central directory 31 | structFileHeader = "<4s2B4HlLL2H" # 12 items, file header record, 30 bytes 32 | stringFileHeader = "PK\003\004" # magic number for file header 33 | structEndArchive64Locator = "<4slql" # 4 items, locate Zip64 header, 20 bytes 34 | stringEndArchive64Locator = "PK\x06\x07" # magic token for locator header 35 | structEndArchive64 = "<4sqhhllqqqq" # 10 items, end of archive (Zip64), 56 bytes 36 | stringEndArchive64 = "PK\x06\x06" # magic token for Zip64 header 37 | stringDataDescriptor = "PK\x07\x08" # magic number for data descriptor 38 | 39 | # indexes of entries in the central directory structure 40 | _CD_SIGNATURE = 0 41 | _CD_CREATE_VERSION = 1 42 | _CD_CREATE_SYSTEM = 2 43 | _CD_EXTRACT_VERSION = 3 44 | _CD_EXTRACT_SYSTEM = 4 # is this meaningful? 45 | _CD_FLAG_BITS = 5 46 | _CD_COMPRESS_TYPE = 6 47 | _CD_TIME = 7 48 | _CD_DATE = 8 49 | _CD_CRC = 9 50 | _CD_COMPRESSED_SIZE = 10 51 | _CD_UNCOMPRESSED_SIZE = 11 52 | _CD_FILENAME_LENGTH = 12 53 | _CD_EXTRA_FIELD_LENGTH = 13 54 | _CD_COMMENT_LENGTH = 14 55 | _CD_DISK_NUMBER_START = 15 56 | _CD_INTERNAL_FILE_ATTRIBUTES = 16 57 | _CD_EXTERNAL_FILE_ATTRIBUTES = 17 58 | _CD_LOCAL_HEADER_OFFSET = 18 59 | 60 | # indexes of entries in the local file header structure 61 | _FH_SIGNATURE = 0 62 | _FH_EXTRACT_VERSION = 1 63 | _FH_EXTRACT_SYSTEM = 2 # is this meaningful? 64 | _FH_GENERAL_PURPOSE_FLAG_BITS = 3 65 | _FH_COMPRESSION_METHOD = 4 66 | _FH_LAST_MOD_TIME = 5 67 | _FH_LAST_MOD_DATE = 6 68 | _FH_CRC = 7 69 | _FH_COMPRESSED_SIZE = 8 70 | _FH_UNCOMPRESSED_SIZE = 9 71 | _FH_FILENAME_LENGTH = 10 72 | _FH_EXTRA_FIELD_LENGTH = 11 73 | 74 | 75 | class ZipInfo (object): 76 | """Class with attributes describing each file in the ZIP archive.""" 77 | 78 | __slots__ = ( 79 | 'orig_filename', 80 | 'filename', 81 | 'date_time', 82 | 'compress_type', 83 | 'comment', 84 | 'extra', 85 | 'create_system', 86 | 'create_version', 87 | 'extract_version', 88 | 'reserved', 89 | 'flag_bits', 90 | 'volume', 91 | 'internal_attr', 92 | 'external_attr', 93 | 'header_offset', 94 | 'CRC', 95 | 'compress_size', 96 | 'file_size', 97 | ) 98 | 99 | def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)): 100 | self.orig_filename = filename # Original file name in archive 101 | 102 | # Terminate the file name at the first null byte. Null bytes in file 103 | # names are used as tricks by viruses in archives. 104 | null_byte = filename.find(chr(0)) 105 | if null_byte >= 0: 106 | filename = filename[0:null_byte] 107 | # This is used to ensure paths in generated ZIP files always use 108 | # forward slashes as the directory separator, as required by the 109 | # ZIP format specification. 110 | if os.sep != "/" and os.sep in filename: 111 | filename = filename.replace(os.sep, "/") 112 | 113 | self.filename = filename # Normalized file name 114 | self.date_time = date_time # year, month, day, hour, min, sec 115 | # Standard values: 116 | self.compress_type = ZIP_STORED # Type of compression for the file 117 | self.comment = "" # Comment for each file 118 | self.extra = "" # ZIP extra data 119 | if sys.platform == 'win32': 120 | self.create_system = 0 # System which created ZIP archive 121 | else: 122 | # Assume everything else is unix-y 123 | self.create_system = 3 # System which created ZIP archive 124 | self.create_version = 20 # Version which created ZIP archive 125 | self.extract_version = 20 # Version needed to extract archive 126 | self.reserved = 0 # Must be zero 127 | self.flag_bits = 0x08 # ZIP flag bits, bit 3 indicates presence of data descriptor 128 | self.volume = 0 # Volume number of file header 129 | self.internal_attr = 0 # Internal attributes 130 | self.external_attr = 0 # External file attributes 131 | # Other attributes are set by class ZipFile: 132 | # header_offset Byte offset to the file header 133 | # CRC CRC-32 of the uncompressed file 134 | # compress_size Size of the compressed file 135 | # file_size Size of the uncompressed file 136 | 137 | def DataDescriptor(self): 138 | if self.compress_size > ZIP64_LIMIT or self.file_size > ZIP64_LIMIT: 139 | fmt = "<4slQQ" 140 | else: 141 | fmt = "<4slLL" 142 | return struct.pack(fmt, stringDataDescriptor, self.CRC, self.compress_size, self.file_size) 143 | 144 | def FileHeader(self): 145 | """Return the per-file header as a string.""" 146 | dt = self.date_time 147 | dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] 148 | dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) 149 | if self.flag_bits & 0x08: 150 | # Set these to zero because we write them after the file data 151 | CRC = compress_size = file_size = 0 152 | else: 153 | CRC = self.CRC 154 | compress_size = self.compress_size 155 | file_size = self.file_size 156 | 157 | extra = self.extra 158 | 159 | if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: 160 | # File is larger than what fits into a 4 byte integer, 161 | # fall back to the ZIP64 extension 162 | fmt = ' ZIP64_LIMIT or zinfo.compress_size > ZIP64_LIMIT: 338 | extra.append(zinfo.file_size) 339 | extra.append(zinfo.compress_size) 340 | file_size = 0xffffffff #-1 341 | compress_size = 0xffffffff #-1 342 | else: 343 | file_size = zinfo.file_size 344 | compress_size = zinfo.compress_size 345 | 346 | if zinfo.header_offset > ZIP64_LIMIT: 347 | extra.append(zinfo.header_offset) 348 | header_offset = -1 # struct "l" format: 32 one bits 349 | else: 350 | header_offset = zinfo.header_offset 351 | 352 | extra_data = zinfo.extra 353 | if extra: 354 | # Append a ZIP64 field to the extra's 355 | extra_data = struct.pack(' ZIP64_LIMIT: 379 | # Need to write the ZIP64 end-of-archive records 380 | zip64endrec = struct.pack(structEndArchive64, stringEndArchive64, 381 | 44, 45, 45, 0, 0, count, count, pos2 - pos1, pos1) 382 | data.append( self.update_data_ptr(zip64endrec)) 383 | 384 | zip64locrec = struct.pack(structEndArchive64Locator, 385 | stringEndArchive64Locator, 0, pos2, 1) 386 | data.append( self.update_data_ptr(zip64locrec)) 387 | 388 | # XXX Why is `pos3` computed next? It's never referenced. 389 | pos3 = self.data_ptr 390 | endrec = struct.pack(structEndArchive, stringEndArchive, 391 | 0, 0, count, count, pos2 - pos1, -1, 0) 392 | data.append( self.update_data_ptr(endrec)) 393 | 394 | else: 395 | endrec = struct.pack(structEndArchive, stringEndArchive, 396 | 0, 0, count, count, pos2 - pos1, pos1, 0) 397 | data.append( self.update_data_ptr(endrec)) 398 | 399 | return ''.join(data) 400 | 401 | 402 | if __name__ == "__main__": 403 | zipfile = sys.argv[1] 404 | path = sys.argv[2] 405 | 406 | zf = open(zipfile, 'wb') 407 | 408 | for data in ZipStream(path): 409 | zf.write(data) 410 | 411 | zf.close() 412 | 413 | --------------------------------------------------------------------------------