├── .gitignore
├── .npmignore
├── History.md
├── Makefile
├── Readme.md
├── src
    └── img.c
└── test
    ├── apple.png
    ├── firefox.png
    ├── google.gif
    ├── icon.gif
    ├── jpeg
    ├── puffer.gif
    └── tux.png


/.gitignore:
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1 | .DS_Store
2 | node_modules
3 | *.sock
4 | img
5 | *.o
6 | 


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/.npmignore:
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1 | support
2 | test
3 | examples
4 | *.sock
5 | 


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/History.md:
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 1 | 
 2 | 0.0.2 / 2011-09-08 
 3 | ==================
 4 | 
 5 |   * Fixed sign
 6 | 
 7 | 0.0.1 / 2011-08-28 
 8 | ==================
 9 | 
10 |   * Initial commit
11 | 
12 | 


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/Makefile:
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 1 | 
 2 | SRC = $(shell find src/*.c)
 3 | OBJ = $(SRC:.c=.o)
 4 | CFLAGS = -std=c99
 5 | PREFIX = /usr/local
 6 | 
 7 | img: $(OBJ)
 8 | 	$(CC) $^ -o $@
 9 | 
10 | install: img
11 | 	cp -f $< $(PREFIX)/bin/$<
12 | 
13 | uninstall:
14 | 	rm -f $(PREFIX)/bin/img
15 | 
16 | test:
17 | 	@echo PNG
18 | 	@./img test/firefox.png
19 | 	@./img test/apple.png
20 | 	@./img test/tux.png
21 | 	@echo
22 | 	@echo GIF
23 | 	@./img test/puffer.gif
24 | 	@./img test/google.gif
25 | 	@echo
26 | 	@echo JPEG
27 | 	@./img test/jpeg
28 | 
29 | clean:
30 | 	rm -f img
31 | 
32 | .PHONY: clean test install uninstall


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/Readme.md:
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 1 | 
 2 | # img
 3 | 
 4 |   image dimension reader.
 5 | 
 6 | ## Why?
 7 | 
 8 |  Because I'm lazy. Typically CSS compilers like SASS and Stylus support functions that allow you to read image dimensions directly in the language, however if and when you are working with regular CSS this can be a pain in the ass.
 9 | 
10 | ## Installation
11 | 
12 |     $ make install
13 | 
14 | ## Usage
15 | 
16 | ```
17 | 
18 | Usage: img <path>
19 | 
20 | ```
21 | 
22 | ## Examples
23 | 
24 | ```bash
25 | $ img test/firefox.png 
26 | width: 350px;
27 | height: 279px;
28 | ```
29 | 
30 | ## Format support
31 | 
32 |  Currently only __PNG__ and __GIF__ are supported, because it's
33 |  pretty rare (for myself at least) to use JPEGs or others in
34 |  CSS, though feel free to submit a pull-request.
35 | 
36 | ## License 
37 | 
38 | (The MIT License)
39 | 
40 | Copyright (c) 2011 TJ Holowaychuk &lt;tj@vision-media.ca&gt;
41 | 
42 | Permission is hereby granted, free of charge, to any person obtaining
43 | a copy of this software and associated documentation files (the
44 | 'Software'), to deal in the Software without restriction, including
45 | without limitation the rights to use, copy, modify, merge, publish,
46 | distribute, sublicense, and/or sell copies of the Software, and to
47 | permit persons to whom the Software is furnished to do so, subject to
48 | the following conditions:
49 | 
50 | The above copyright notice and this permission notice shall be
51 | included in all copies or substantial portions of the Software.
52 | 
53 | THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
54 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
55 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
56 | IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
57 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
58 | TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
59 | SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


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/src/img.c:
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  1 | 
  2 | //
  3 | // img.c
  4 | //
  5 | // Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>
  6 | //
  7 | 
  8 | #include <stdio.h>
  9 | #include <stdint.h>
 10 | #include <stdlib.h>
 11 | #include <fcntl.h>
 12 | #include <unistd.h>
 13 | 
 14 | /*
 15 |  * Program version.
 16 |  */
 17 | 
 18 | #define VERSION "0.0.2"
 19 | 
 20 | /*
 21 |  * Sniff bytes for JPEG's magic number ff d8.
 22 |  */
 23 | 
 24 | int
 25 | is_jpeg(uint8_t *buf) {
 26 |   return 0xff == buf[0] && 0xd8 == buf[1];
 27 | }
 28 | 
 29 | /*
 30 |  * Sniff bytes 0..2 for "GIF".
 31 |  */
 32 | 
 33 | int
 34 | is_gif(uint8_t *buf) {
 35 |   return 'G' == buf[0] && 'I' == buf[1] && 'F' == buf[2];
 36 | }
 37 | 
 38 | /*
 39 |  * Sniff bytes 1..3 for "PNG".
 40 |  */
 41 | 
 42 | int
 43 | is_png(uint8_t *buf) {
 44 |   return 'P' == buf[1] && 'N' == buf[2] && 'G' == buf[3];
 45 | }
 46 | 
 47 | /*
 48 |  * Read big-endian uint32 from `buf`.
 49 |  */
 50 | 
 51 | int
 52 | read_uint32(uint8_t *buf) {
 53 |   return buf[0] << 24
 54 |     | buf[1] << 16
 55 |     | buf[2] << 8
 56 |     | buf[3];
 57 | }
 58 | 
 59 | /*
 60 |  * Read little-endian uint16 from `buf`.
 61 |  */
 62 | 
 63 | int
 64 | read_uint16(uint8_t *buf) {
 65 |   return buf[1] << 8
 66 |     | buf[0];
 67 | }
 68 | 
 69 | /*
 70 |  * Output CSS for `width` / `height`.
 71 |  */
 72 | 
 73 | void
 74 | output_css_dimensions(int width, int height) {
 75 |   printf("width: %dpx;\n", width);
 76 |   printf("height: %dpx;\n", height);
 77 | }
 78 | 
 79 | /*
 80 |  * Read `len` bytes at the given `offset` into `buf`.
 81 |  */
 82 | 
 83 | void
 84 | read_from(const char *path, char *buf, int len, int offset) {
 85 |   // open file
 86 |   int fd = open(path, O_RDONLY);
 87 |   if (fd < 0) {
 88 |     perror("open()");
 89 |     exit(1);
 90 |   }
 91 |  
 92 |   // read bytes
 93 |   if (pread(fd, buf, len, offset) < 0) {
 94 |     perror("read()");
 95 |     exit(1);
 96 |   }
 97 |   close(fd);
 98 | }
 99 | 
100 | /*
101 |  * Output GIF dimensions for `path`.
102 |  */
103 | 
104 | void
105 | output_gif_dimensions(const char *path) {
106 |   char buf[4];
107 |   read_from(path, buf, 4, 6);
108 |   output_css_dimensions(
109 |       read_uint16(buf)
110 |     , read_uint16(buf + 2));
111 | }
112 | 
113 | /*
114 |  * Output PNG dimensions for `path`.
115 |  */
116 | 
117 | void
118 | output_png_dimensions(const char *path) {
119 |   // read bytes
120 |   char buf[8];
121 |   read_from(path, buf, 8, 16);
122 |   output_css_dimensions(
123 |       read_uint32(buf)
124 |     , read_uint32(buf + 4));
125 | }
126 | 
127 | /*
128 |  * Output JPEG dimensions for `path`.
129 |  */
130 | 
131 | void
132 | output_jpeg_dimensions(const char *path) {
133 |   fprintf(stderr, "jpeg not yet supported\n");
134 |   exit(1);
135 | }
136 | 
137 | /*
138 |  * Output usage information.
139 |  */
140 | 
141 | void
142 | usage() {
143 |   printf(
144 |     "\n"
145 |     "  Usage: img <path>\n"
146 |     "\n");
147 |   exit(1);
148 | }
149 | 
150 | /*
151 |  * Handle args.
152 |  */
153 | 
154 | int
155 | main(int argc, const char **argv){
156 |   // path required
157 |   if (argc < 2) usage();
158 | 
159 |   const char *path = argv[1];
160 | 
161 |   // open file
162 |   int fd = open(path, O_RDONLY);
163 |   if (fd < 0) {
164 |     perror("open()");
165 |     exit(1);
166 |   }
167 | 
168 |   // read bytes
169 |   char buf[5];
170 |   if (read(fd, &buf, 5) < 0) {
171 |     perror("read()");
172 |     exit(1);
173 |   }
174 |   close(fd);
175 | 
176 |   // sniff bytes
177 |   if (is_gif(buf)) output_gif_dimensions(path);
178 |   else if (is_png(buf)) output_png_dimensions(path);
179 |   else if (is_jpeg(buf)) output_jpeg_dimensions(path);
180 |   
181 |   return 0;
182 | }


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/test/apple.png:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/apple.png


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/test/firefox.png:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/firefox.png


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/test/google.gif:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/google.gif


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/test/icon.gif:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/icon.gif


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/test/jpeg:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/jpeg


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/test/puffer.gif:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/puffer.gif


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/test/tux.png:
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https://raw.githubusercontent.com/tj/img/e5a9fa685c6f065eca4c8b6d58e50e3b36f068ba/test/tux.png


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