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author | Jens Arnold <amiconn@rockbox.org> | 2005-11-27 23:41:55 +0000 |
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committer | Jens Arnold <amiconn@rockbox.org> | 2005-11-27 23:41:55 +0000 |
commit | 7c21a96e9afa3408ca0b459a392275aa0ae77608 (patch) | |
tree | 9933c4012631b53e72478b14db6315dfcaba5c32 /tools/ucl/src/ucl_crc.c | |
parent | f04577377d879d040ef046c38f6ab18b84a51341 (diff) | |
download | rockbox-7c21a96e9afa3408ca0b459a392275aa0ae77608.tar.gz rockbox-7c21a96e9afa3408ca0b459a392275aa0ae77608.zip |
Initial check-in of (stripped-down) UCL data compression library v 1.01
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8087 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'tools/ucl/src/ucl_crc.c')
-rw-r--r-- | tools/ucl/src/ucl_crc.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/tools/ucl/src/ucl_crc.c b/tools/ucl/src/ucl_crc.c new file mode 100644 index 0000000000..7608ecffb6 --- /dev/null +++ b/tools/ucl/src/ucl_crc.c | |||
@@ -0,0 +1,135 @@ | |||
1 | /* ucl_crc.c -- crc checksum for the the UCL library | ||
2 | |||
3 | This file is part of the UCL data compression library. | ||
4 | |||
5 | Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer | ||
6 | All Rights Reserved. | ||
7 | |||
8 | The UCL library is free software; you can redistribute it and/or | ||
9 | modify it under the terms of the GNU General Public License as | ||
10 | published by the Free Software Foundation; either version 2 of | ||
11 | the License, or (at your option) any later version. | ||
12 | |||
13 | The UCL library is distributed in the hope that it will be useful, | ||
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
16 | GNU General Public License for more details. | ||
17 | |||
18 | You should have received a copy of the GNU General Public License | ||
19 | along with the UCL library; see the file COPYING. | ||
20 | If not, write to the Free Software Foundation, Inc., | ||
21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
22 | |||
23 | Markus F.X.J. Oberhumer | ||
24 | <markus@oberhumer.com> | ||
25 | http://www.oberhumer.com/opensource/ucl/ | ||
26 | */ | ||
27 | |||
28 | |||
29 | #include "ucl_conf.h" | ||
30 | #include "ucl_util.h" | ||
31 | |||
32 | |||
33 | /*********************************************************************** | ||
34 | // crc32 checksum | ||
35 | // adapted from free code by Mark Adler <madler@alumni.caltech.edu> | ||
36 | // see http://www.cdrom.com/pub/infozip/zlib/ | ||
37 | ************************************************************************/ | ||
38 | |||
39 | const ucl_uint32 _ucl_crc32_table[256] = { | ||
40 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, | ||
41 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, | ||
42 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, | ||
43 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, | ||
44 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, | ||
45 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, | ||
46 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, | ||
47 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, | ||
48 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, | ||
49 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, | ||
50 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, | ||
51 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, | ||
52 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, | ||
53 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, | ||
54 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, | ||
55 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, | ||
56 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, | ||
57 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, | ||
58 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, | ||
59 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, | ||
60 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, | ||
61 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, | ||
62 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, | ||
63 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, | ||
64 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, | ||
65 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, | ||
66 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, | ||
67 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, | ||
68 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, | ||
69 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, | ||
70 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, | ||
71 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, | ||
72 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, | ||
73 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, | ||
74 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, | ||
75 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, | ||
76 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, | ||
77 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, | ||
78 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, | ||
79 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, | ||
80 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, | ||
81 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, | ||
82 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, | ||
83 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, | ||
84 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, | ||
85 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, | ||
86 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, | ||
87 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, | ||
88 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, | ||
89 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, | ||
90 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, | ||
91 | 0x2d02ef8dL | ||
92 | }; | ||
93 | |||
94 | |||
95 | #if 1 | ||
96 | #define UCL_DO1(buf,i) \ | ||
97 | crc = _ucl_crc32_table[((int)crc ^ buf[i]) & 0xff] ^ (crc >> 8) | ||
98 | #else | ||
99 | #define UCL_DO1(buf,i) \ | ||
100 | crc = _ucl_crc32_table[(unsigned char)((unsigned char)crc ^ buf[i])] ^ (crc >> 8) | ||
101 | #endif | ||
102 | #define UCL_DO2(buf,i) UCL_DO1(buf,i); UCL_DO1(buf,i+1); | ||
103 | #define UCL_DO4(buf,i) UCL_DO2(buf,i); UCL_DO2(buf,i+2); | ||
104 | #define UCL_DO8(buf,i) UCL_DO4(buf,i); UCL_DO4(buf,i+4); | ||
105 | #define UCL_DO16(buf,i) UCL_DO8(buf,i); UCL_DO8(buf,i+8); | ||
106 | |||
107 | |||
108 | UCL_PUBLIC(ucl_uint32) | ||
109 | ucl_crc32(ucl_uint32 c, const ucl_bytep buf, ucl_uint len) | ||
110 | { | ||
111 | ucl_uint32 crc = (c & UCL_UINT32_C(0xffffffff)) ^ UCL_UINT32_C(0xffffffff); | ||
112 | |||
113 | if (buf == NULL) | ||
114 | return 0; | ||
115 | |||
116 | if (len >= 16) do | ||
117 | { | ||
118 | UCL_DO16(buf,0); | ||
119 | buf += 16; | ||
120 | len -= 16; | ||
121 | } while (len >= 16); | ||
122 | if (len != 0) do | ||
123 | { | ||
124 | UCL_DO1(buf,0); | ||
125 | buf += 1; | ||
126 | len -= 1; | ||
127 | } while (len > 0); | ||
128 | |||
129 | return crc ^ UCL_UINT32_C(0xffffffff); | ||
130 | } | ||
131 | |||
132 | |||
133 | /* | ||
134 | vi:ts=4:et | ||
135 | */ | ||