Mercurial > hg > octave-lyh > gnulib-hg
changeset 6357:9abdb1386cc0
Add crc module.
author | Simon Josefsson <simon@josefsson.org> |
---|---|
date | Tue, 11 Oct 2005 18:25:51 +0000 |
parents | 998625a579ed |
children | e42efeca321d |
files | ChangeLog lib/ChangeLog lib/crc.c lib/crc.h m4/ChangeLog m4/crc.m4 modules/crc modules/crc-tests tests/test-crc.c |
diffstat | 9 files changed, 281 insertions(+), 0 deletions(-) [+] |
line wrap: on
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--- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2005-10-11 Simon Josefsson <jas@extundo.com> + + * tests/test-crc.c: New file. + + * modules/crc, modules/crc-tests: New files. + 2005-10-10 Paul Eggert <eggert@cs.ucla.edu> * modules/mempcpy (License): GPL -> LGPL.
--- a/lib/ChangeLog +++ b/lib/ChangeLog @@ -1,5 +1,7 @@ 2005-10-11 Simon Josefsson <jas@extundo.com> + * crc.h, crc.c: New files. + * gc.h (gc_hash_buffer): Add doc. 2005-10-11 Bruno Haible <bruno@clisp.org>
new file mode 100644 --- /dev/null +++ b/lib/crc.c @@ -0,0 +1,107 @@ +/* crc.c -- cyclic redundancy checks + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + 02110-1301, USA. */ + +/* Written by Simon Josefsson. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "crc.h" + +/* Table of CRCs of all 8-bit messages. Generated by running code + from RFC 1952 modified to print out the table. */ +static const uint32_t crc32_table[256] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, + 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, + 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, + 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, + 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, + 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, + 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, + 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, + 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, + 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, + 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, + 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, + 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, + 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, + 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, + 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +/* + * The following function was extracted from RFC 1952 by Simon + * Josefsson. It was modified to avoid initial and final XOR, to use + * size_t for the buffer length, and to use the const keyword. + */ +uint32_t +crc32_update_no_xor (uint32_t crc, const char *buf, size_t len) +{ + size_t n; + + for (n = 0; n < len; n++) + crc = crc32_table[(crc ^ buf[n]) & 0xff] ^ (crc >> 8); + + return crc; +} + +uint32_t +crc32_no_xor (const char *buf, size_t len) +{ + return crc32_update_no_xor (0L, buf, len); +} + +uint32_t +crc32_update (uint32_t crc, const char *buf, size_t len) +{ + return crc32_update_no_xor (0L ^ 0xffffffffL, buf, len) ^ 0xffffffffL; +} + +uint32_t +crc32 (const char *buf, size_t len) +{ + return crc32_update (0L, buf, len); +}
new file mode 100644 --- /dev/null +++ b/lib/crc.h @@ -0,0 +1,53 @@ +/* crc.h -- cyclic redundancy checks + Copyright (C) 2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Simon Josefsson. */ + +#ifndef CRC_H +# define CRC_H 1 + +#include <stddef.h> +#if HAVE_INTTYPES_H +# include <inttypes.h> +#endif +#if HAVE_STDINT_H +# include <stdint.h> +#endif + +/* Compute CRC-32 value of LEN bytes long BUF, and return it. */ +extern uint32_t crc32 (const char *buf, size_t len); + +/* Incrementally update CRC-32 value CRC using LEN bytes long BUF. In + the first call, use 0 as the value for CRC. Return the updated + CRC-32 value. */ +extern uint32_t crc32_update (uint32_t crc, const char *buf, size_t len); + +/* Compute modified-CRC-32 value of LEN bytes long BUF, and return it. + The "modification" is to avoid the initial and final XOR operation. + Due to historic implementation errors, this variant is sometimes + used (i.e., in RFC 3961). */ +extern uint32_t crc32_no_xor (const char *buf, size_t len); + +/* Incrementally update modified-CRC-32 value CRC using LEN bytes long + BUF. In the first call, use 0 as the value for CRC. Return the + updated modified-CRC-32 value. The "modification" is to avoid the + initial and final XOR operation. Due to historic implementation + errors, this variant is sometimes used (i.e., in RFC 3961). */ +extern uint32_t +crc32_update_no_xor (uint32_t crc, const char *buf, size_t len); + +#endif /* CRC_H */
--- a/m4/ChangeLog +++ b/m4/ChangeLog @@ -1,3 +1,7 @@ +2005-10-11 Simon Josefsson <jas@extundo.com> + + * crc.m4: New file. + 2005-10-07 Simon Josefsson <jas@extundo.com> * memxor.m4: Remove gl_C_RESTRICT call.
new file mode 100644 --- /dev/null +++ b/m4/crc.m4 @@ -0,0 +1,11 @@ +# crc.m4 serial 1 +dnl Copyright (C) 2005 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_CRC], +[ + AC_LIBSOURCES([crc.h, crc.c]) + AC_LIBOBJ([crc]) +])
new file mode 100644 --- /dev/null +++ b/modules/crc @@ -0,0 +1,24 @@ +Description: +Compute cyclic redundancy codes. + +Files: +lib/crc.h +lib/crc.c +m4/crc.m4 + +Depends-on: +stdint + +configure.ac: +gl_CRC + +Makefile.am: + +Include: +"crc.h" + +License: +LGPL + +Maintainer: +Simon Josefsson
new file mode 100644 --- /dev/null +++ b/modules/crc-tests @@ -0,0 +1,11 @@ +Files: +tests/test-crc.c + +Depends-on: + +configure.ac: + +Makefile.am: +TESTS += test-crc +noinst_PROGRAMS += test-crc +test_crc_SOURCES = test-crc.c
new file mode 100644 --- /dev/null +++ b/tests/test-crc.c @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2005 Free Software Foundation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. */ + +/* Written by Simon Josefsson. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "crc.h" + +#include <stdio.h> + +int +main (int argc, char *argv[]) +{ + uint32_t p; + + p = crc32_update_no_xor (42, "foo", 3); + if (p != 0x46e87f05) + { + printf ("cunx got %lx\n", p); + return 1; + } + + p = crc32_no_xor ("foo", 3); + if (p != 0x7332bc33) + { + printf ("cnx got %lx\n", p); + return 1; + } + + p = crc32_update (42, "foo", 3); + if (p != 0x8c736521) + { + printf ("cu got %lx\n", p); + return 1; + } + + p = crc32 ("foo", 3); + if (p != 0x8c736521) + { + printf ("c got %lx\n", p); + return 1; + } + + return 0; +}