138 lines
5.2 KiB
C
Vendored
138 lines
5.2 KiB
C
Vendored
/*
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Copyright 2020 David Anderson. All Rights Reserved.
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This program is free software; you can redistribute it
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and/or modify it under the terms of version 2.1 of the
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GNU Lesser General Public License as published by the Free
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Software Foundation.
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This program is distributed in the hope that it would be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE.
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Further, this software is distributed without any warranty
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that it is free of the rightful claim of any third person
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regarding infringement or the like. Any license provided
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herein, whether implied or otherwise, applies only to this
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software file. Patent licenses, if any, provided herein
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do not apply to combinations of this program with other
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software, or any other product whatsoever.
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You should have received a copy of the GNU Lesser General
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Public License along with this program; if not, write the
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Free Software Foundation, Inc., 51 Franklin Street - Fifth
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Floor, Boston MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stddef.h> /* size_t */
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#include "dwarf.h"
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#include "libdwarf.h"
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#include "libdwarf_private.h"
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#include "dwarf_base_types.h"
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#include "dwarf_opaque.h" /* For the function prototype */
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#define uint32_t unsigned int
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/* Table computed by David Anderson
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with Mark Adler's table builder
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logic on October 20,2020
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with pattern from polynomial (0xedb88320) */
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static const uint32_t crc32_table[256] =
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{
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0x00000000,0x77073096,0xee0e612c,0x990951ba,
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0x076dc419,0x706af48f,0xe963a535,0x9e6495a3,
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0x0edb8832,0x79dcb8a4,0xe0d5e91e,0x97d2d988,
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0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91,
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0x1db71064,0x6ab020f2,0xf3b97148,0x84be41de,
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0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7,
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0x136c9856,0x646ba8c0,0xfd62f97a,0x8a65c9ec,
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0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5,
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0x3b6e20c8,0x4c69105e,0xd56041e4,0xa2677172,
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0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b,
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0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940,
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0x32d86ce3,0x45df5c75,0xdcd60dcf,0xabd13d59,
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0x26d930ac,0x51de003a,0xc8d75180,0xbfd06116,
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0x21b4f4b5,0x56b3c423,0xcfba9599,0xb8bda50f,
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0x2802b89e,0x5f058808,0xc60cd9b2,0xb10be924,
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0x2f6f7c87,0x58684c11,0xc1611dab,0xb6662d3d,
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0x76dc4190,0x01db7106,0x98d220bc,0xefd5102a,
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0x71b18589,0x06b6b51f,0x9fbfe4a5,0xe8b8d433,
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0x7807c9a2,0x0f00f934,0x9609a88e,0xe10e9818,
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0x7f6a0dbb,0x086d3d2d,0x91646c97,0xe6635c01,
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0x6b6b51f4,0x1c6c6162,0x856530d8,0xf262004e,
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0x6c0695ed,0x1b01a57b,0x8208f4c1,0xf50fc457,
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0x65b0d9c6,0x12b7e950,0x8bbeb8ea,0xfcb9887c,
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0x62dd1ddf,0x15da2d49,0x8cd37cf3,0xfbd44c65,
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0x4db26158,0x3ab551ce,0xa3bc0074,0xd4bb30e2,
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0x4adfa541,0x3dd895d7,0xa4d1c46d,0xd3d6f4fb,
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0x4369e96a,0x346ed9fc,0xad678846,0xda60b8d0,
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0x44042d73,0x33031de5,0xaa0a4c5f,0xdd0d7cc9,
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0x5005713c,0x270241aa,0xbe0b1010,0xc90c2086,
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0x5768b525,0x206f85b3,0xb966d409,0xce61e49f,
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0x5edef90e,0x29d9c998,0xb0d09822,0xc7d7a8b4,
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0x59b33d17,0x2eb40d81,0xb7bd5c3b,0xc0ba6cad,
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0xedb88320,0x9abfb3b6,0x03b6e20c,0x74b1d29a,
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0xead54739,0x9dd277af,0x04db2615,0x73dc1683,
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0xe3630b12,0x94643b84,0x0d6d6a3e,0x7a6a5aa8,
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0xe40ecf0b,0x9309ff9d,0x0a00ae27,0x7d079eb1,
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0xf00f9344,0x8708a3d2,0x1e01f268,0x6906c2fe,
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0xf762575d,0x806567cb,0x196c3671,0x6e6b06e7,
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0xfed41b76,0x89d32be0,0x10da7a5a,0x67dd4acc,
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0xf9b9df6f,0x8ebeeff9,0x17b7be43,0x60b08ed5,
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0xd6d6a3e8,0xa1d1937e,0x38d8c2c4,0x4fdff252,
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0xd1bb67f1,0xa6bc5767,0x3fb506dd,0x48b2364b,
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0xd80d2bda,0xaf0a1b4c,0x36034af6,0x41047a60,
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0xdf60efc3,0xa867df55,0x316e8eef,0x4669be79,
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0xcb61b38c,0xbc66831a,0x256fd2a0,0x5268e236,
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0xcc0c7795,0xbb0b4703,0x220216b9,0x5505262f,
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0xc5ba3bbe,0xb2bd0b28,0x2bb45a92,0x5cb36a04,
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0xc2d7ffa7,0xb5d0cf31,0x2cd99e8b,0x5bdeae1d,
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0x9b64c2b0,0xec63f226,0x756aa39c,0x026d930a,
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0x9c0906a9,0xeb0e363f,0x72076785,0x05005713,
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0x95bf4a82,0xe2b87a14,0x7bb12bae,0x0cb61b38,
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0x92d28e9b,0xe5d5be0d,0x7cdcefb7,0x0bdbdf21,
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0x86d3d2d4,0xf1d4e242,0x68ddb3f8,0x1fda836e,
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0x81be16cd,0xf6b9265b,0x6fb077e1,0x18b74777,
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0x88085ae6,0xff0f6a70,0x66063bca,0x11010b5c,
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0x8f659eff,0xf862ae69,0x616bffd3,0x166ccf45,
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0xa00ae278,0xd70dd2ee,0x4e048354,0x3903b3c2,
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0xa7672661,0xd06016f7,0x4969474d,0x3e6e77db,
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0xaed16a4a,0xd9d65adc,0x40df0b66,0x37d83bf0,
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0xa9bcae53,0xdebb9ec5,0x47b2cf7f,0x30b5ffe9,
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0xbdbdf21c,0xcabac28a,0x53b39330,0x24b4a3a6,
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0xbad03605,0xcdd70693,0x54de5729,0x23d967bf,
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0xb3667a2e,0xc4614ab8,0x5d681b02,0x2a6f2b94,
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0xb40bbe37,0xc30c8ea1,0x5a05df1b,0x2d02ef8d
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};
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/* The following is essentially identical
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to every crc32 anyone uses up to trivial
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differences in starting conditions.
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The algorithm appears on
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https://en.wikipedia.org/wiki/Cyclic_redundancy_check
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in a simple logic loop (written in no actual
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language but English) and the following is a translation
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into C. Just like every other crc calculation.
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The unsigned int return will not get the same CRC as
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Linux/Macos if int/unsigned-int is 16 bits (Windows),
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but there the crc does not matter in practice.
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The results on big-endian are not the same
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as little-endian machines.*/
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unsigned int
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dwarf_basic_crc32 (const unsigned char *buf,
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unsigned long len,
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unsigned int crc)
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{
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const unsigned char *end = 0;
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crc = ~crc;
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for (end = buf + len; buf < end; ++buf)
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crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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return ~crc;
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}
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