| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de> |
| 3 | * |
3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without modifica- |
4 | * Redistribution and use in source and binary forms, with or without modifica- |
| 5 | * tion, are permitted provided that the following conditions are met: |
5 | * tion, are permitted provided that the following conditions are met: |
| 6 | * |
6 | * |
| 7 | * 1. Redistributions of source code must retain the above copyright notice, |
7 | * 1. Redistributions of source code must retain the above copyright notice, |
| … | |
… | |
| 38 | |
38 | |
| 39 | #include "config.h" |
39 | #include "config.h" |
| 40 | |
40 | |
| 41 | #include <stdio.h> |
41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
42 | #include <stdlib.h> |
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|
43 | #include <string.h> |
| 43 | #include <assert.h> |
44 | #include <assert.h> |
| 44 | |
45 | |
| 45 | #include <unistd.h> |
46 | #include <unistd.h> |
| 46 | #include <getopt.h> |
47 | #include <getopt.h> |
| 47 | |
48 | |
| … | |
… | |
| 52 | static void |
53 | static void |
| 53 | usage (int ec) |
54 | usage (int ec) |
| 54 | { |
55 | { |
| 55 | fprintf (stderr, "\n" |
56 | fprintf (stderr, "\n" |
| 56 | "lzf, a very lightweight compression/decompression filter\n" |
57 | "lzf, a very lightweight compression/decompression filter\n" |
| 57 | "written by Marc Lehmann <pcg@goof.com> You can find more info at\n" |
58 | "written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n" |
| 58 | "http://liblzf.plan9.de/\n" |
59 | "http://liblzf.plan9.de/\n" |
| 59 | "\n" |
60 | "\n" |
| 60 | "USAGE: lzf -c [-b blocksize] | -d\n" |
61 | "USAGE: lzf -c [-b blocksize] | -d\n" |
| 61 | " -c compress\n" |
62 | " -c compress\n" |
| 62 | " -d decompress\n" |
63 | " -d decompress\n" |
| … | |
… | |
| 68 | } |
69 | } |
| 69 | |
70 | |
| 70 | /* |
71 | /* |
| 71 | * Anatomy: an lzf file consists of any number of blocks in the following format: |
72 | * Anatomy: an lzf file consists of any number of blocks in the following format: |
| 72 | * |
73 | * |
|
|
74 | * \x00 EOF (optional) |
| 73 | * "ZV\0" 2-byte-usize <uncompressed data> |
75 | * "ZV\0" 2-byte-usize <uncompressed data> |
| 74 | * "ZV\1" 2-byte-csize 2-byte-usize <compressed data> |
76 | * "ZV\1" 2-byte-csize 2-byte-usize <compressed data> |
| 75 | * "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI) |
77 | * "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI) |
| 76 | * |
78 | * |
| 77 | */ |
79 | */ |
| … | |
… | |
| 121 | header[4] = us & 0xff; |
123 | header[4] = us & 0xff; |
| 122 | |
124 | |
| 123 | fwrite (header, 3+2, 1, stdout); |
125 | fwrite (header, 3+2, 1, stdout); |
| 124 | fwrite (buff1, us, 1, stdout); |
126 | fwrite (buff1, us, 1, stdout); |
| 125 | } |
127 | } |
| 126 | } while (!feof (stdin)); |
128 | } |
| 127 | } |
129 | } |
| 128 | |
130 | |
| 129 | static void decompress (void) |
131 | static void decompress (void) |
| 130 | { |
132 | { |
| 131 | ssize_t us; |
133 | ssize_t us; |
| … | |
… | |
| 133 | u8 buff1[64*1024]; |
135 | u8 buff1[64*1024]; |
| 134 | u8 buff2[64*1024]; |
136 | u8 buff2[64*1024]; |
| 135 | u8 header[3+2+2]; |
137 | u8 header[3+2+2]; |
| 136 | |
138 | |
| 137 | for(;;) { |
139 | for(;;) { |
| 138 | if (fread (header, 3+2, 1, stdin) != 1) |
140 | int hdrsize = fread (header, 1, 3+2, stdin); |
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141 | |
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142 | /* check for \0 record */ |
|
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143 | if (hdrsize) |
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144 | { |
|
|
145 | if (!header[0]) |
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146 | break; |
|
|
147 | else if (hdrsize != 3+2) |
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148 | { |
|
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149 | if (feof (stdin)) |
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150 | fprintf (stderr, "decompress: invalid stream - short header\n"); |
|
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151 | else |
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152 | perror ("decompress"); |
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153 | |
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154 | exit (1); |
|
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155 | } |
|
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156 | } |
|
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157 | else |
| 139 | { |
158 | { |
| 140 | if (feof (stdin)) |
159 | if (feof (stdin)) |
| 141 | break; |
160 | break; |
| 142 | else |
161 | else |
| 143 | { |
162 | { |
