/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.c,v 1.3 2001/07/26 21:41:21 dtashley Exp $ */
//--------------------------------------------------------------------------------
//Copyright 2001 David T. Ashley
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#define MODULE_CRCHASHFUNCS
#include
#include
#include
#include "crchashfuncs.h"
//This is the data table used to generate CRC-32 values. The code to
//generate these values isn't reproduced here (it was discarded after
//the values were generated), but this code originally came from a
//web page by Richard A. Ellingson. I do not at this time understand
//the math behind the generation or usage of this table.
static const unsigned CRCHASHFUNCS_crc32tab[256] =
{
/* [000] */ 0x00000000,
/* [001] */ 0x77073096,
/* [002] */ 0xEE0E612C,
/* [003] */ 0x990951BA,
/* [004] */ 0x076DC419,
/* [005] */ 0x706AF48F,
/* [006] */ 0xE963A535,
/* [007] */ 0x9E6495A3,
/* [008] */ 0x0EDB8832,
/* [009] */ 0x79DCB8A4,
/* [010] */ 0xE0D5E91E,
/* [011] */ 0x97D2D988,
/* [012] */ 0x09B64C2B,
/* [013] */ 0x7EB17CBD,
/* [014] */ 0xE7B82D07,
/* [015] */ 0x90BF1D91,
/* [016] */ 0x1DB71064,
/* [017] */ 0x6AB020F2,
/* [018] */ 0xF3B97148,
/* [019] */ 0x84BE41DE,
/* [020] */ 0x1ADAD47D,
/* [021] */ 0x6DDDE4EB,
/* [022] */ 0xF4D4B551,
/* [023] */ 0x83D385C7,
/* [024] */ 0x136C9856,
/* [025] */ 0x646BA8C0,
/* [026] */ 0xFD62F97A,
/* [027] */ 0x8A65C9EC,
/* [028] */ 0x14015C4F,
/* [029] */ 0x63066CD9,
/* [030] */ 0xFA0F3D63,
/* [031] */ 0x8D080DF5,
/* [032] */ 0x3B6E20C8,
/* [033] */ 0x4C69105E,
/* [034] */ 0xD56041E4,
/* [035] */ 0xA2677172,
/* [036] */ 0x3C03E4D1,
/* [037] */ 0x4B04D447,
/* [038] */ 0xD20D85FD,
/* [039] */ 0xA50AB56B,
/* [040] */ 0x35B5A8FA,
/* [041] */ 0x42B2986C,
/* [042] */ 0xDBBBC9D6,
/* [043] */ 0xACBCF940,
/* [044] */ 0x32D86CE3,
/* [045] */ 0x45DF5C75,
/* [046] */ 0xDCD60DCF,
/* [047] */ 0xABD13D59,
/* [048] */ 0x26D930AC,
/* [049] */ 0x51DE003A,
/* [050] */ 0xC8D75180,
/* [051] */ 0xBFD06116,
/* [052] */ 0x21B4F4B5,
/* [053] */ 0x56B3C423,
/* [054] */ 0xCFBA9599,
/* [055] */ 0xB8BDA50F,
/* [056] */ 0x2802B89E,
/* [057] */ 0x5F058808,
/* [058] */ 0xC60CD9B2,
/* [059] */ 0xB10BE924,
/* [060] */ 0x2F6F7C87,
/* [061] */ 0x58684C11,
/* [062] */ 0xC1611DAB,
/* [063] */ 0xB6662D3D,
/* [064] */ 0x76DC4190,
/* [065] */ 0x01DB7106,
/* [066] */ 0x98D220BC,
/* [067] */ 0xEFD5102A,
/* [068] */ 0x71B18589,
/* [069] */ 0x06B6B51F,
/* [070] */ 0x9FBFE4A5,
/* [071] */ 0xE8B8D433,
/* [072] */ 0x7807C9A2,
/* [073] */ 0x0F00F934,
/* [074] */ 0x9609A88E,
/* [075] */ 0xE10E9818,
/* [076] */ 0x7F6A0DBB,
/* [077] */ 0x086D3D2D,
/* [078] */ 0x91646C97,
/* [079] */ 0xE6635C01,
/* [080] */ 0x6B6B51F4,
/* [081] */ 0x1C6C6162,
/* [082] */ 0x856530D8,
/* [083] */ 0xF262004E,
/* [084] */ 0x6C0695ED,
/* [085] */ 0x1B01A57B,
/* [086] */ 0x8208F4C1,
/* [087] */ 0xF50FC457,
/* [088] */ 0x65B0D9C6,
/* [089] */ 0x12B7E950,
/* [090] */ 0x8BBEB8EA,
/* [091] */ 0xFCB9887C,
/* [092] */ 0x62DD1DDF,
/* [093] */ 0x15DA2D49,
/* [094] */ 0x8CD37CF3,
/* [095] */ 0xFBD44C65,
/* [096] */ 0x4DB26158,
/* [097] */ 0x3AB551CE,
/* [098] */ 0xA3BC0074,
/* [099] */ 0xD4BB30E2,
/* [100] */ 0x4ADFA541,
/* [101] */ 0x3DD895D7,
/* [102] */ 0xA4D1C46D,
/* [103] */ 0xD3D6F4FB,
/* [104] */ 0x4369E96A,
/* [105] */ 0x346ED9FC,
/* [106] */ 0xAD678846,
/* [107] */ 0xDA60B8D0,
/* [108] */ 0x44042D73,
/* [109] */ 0x33031DE5,
/* [110] */ 0xAA0A4C5F,
/* [111] */ 0xDD0D7CC9,
/* [112] */ 0x5005713C,
/* [113] */ 0x270241AA,
/* [114] */ 0xBE0B1010,
/* [115] */ 0xC90C2086,
/* [116] */ 0x5768B525,
/* [117] */ 0x206F85B3,
/* [118] */ 0xB966D409,
/* [119] */ 0xCE61E49F,
/* [120] */ 0x5EDEF90E,
/* [121] */ 0x29D9C998,
/* [122] */ 0xB0D09822,
/* [123] */ 0xC7D7A8B4,
/* [124] */ 0x59B33D17,
/* [125] */ 0x2EB40D81,
/* [126] */ 0xB7BD5C3B,
/* [127] */ 0xC0BA6CAD,
/* [128] */ 0xEDB88320,
/* [129] */ 0x9ABFB3B6,
/* [130] */ 0x03B6E20C,
/* [131] */ 0x74B1D29A,
/* [132] */ 0xEAD54739,
/* [133] */ 0x9DD277AF,
/* [134] */ 0x04DB2615,
/* [135] */ 0x73DC1683,
/* [136] */ 0xE3630B12,
/* [137] */ 0x94643B84,
/* [138] */ 0x0D6D6A3E,
/* [139] */ 0x7A6A5AA8,
/* [140] */ 0xE40ECF0B,
/* [141] */ 0x9309FF9D,
/* [142] */ 0x0A00AE27,
/* [143] */ 0x7D079EB1,
/* [144] */ 0xF00F9344,
/* [145] */ 0x8708A3D2,
/* [146] */ 0x1E01F268,
/* [147] */ 0x6906C2FE,
/* [148] */ 0xF762575D,
/* [149] */ 0x806567CB,
/* [150] */ 0x196C3671,
/* [151] */ 0x6E6B06E7,
/* [152] */ 0xFED41B76,
/* [153] */ 0x89D32BE0,
/* [154] */ 0x10DA7A5A,
/* [155] */ 0x67DD4ACC,
/* [156] */ 0xF9B9DF6F,
/* [157] */ 0x8EBEEFF9,
/* [158] */ 0x17B7BE43,
/* [159] */ 0x60B08ED5,
/* [160] */ 0xD6D6A3E8,
/* [161] */ 0xA1D1937E,
/* [162] */ 0x38D8C2C4,
/* [163] */ 0x4FDFF252,
/* [164] */ 0xD1BB67F1,
/* [165] */ 0xA6BC5767,
/* [166] */ 0x3FB506DD,
/* [167] */ 0x48B2364B,
/* [168] */ 0xD80D2BDA,
/* [169] */ 0xAF0A1B4C,
/* [170] */ 0x36034AF6,
/* [171] */ 0x41047A60,
/* [172] */ 0xDF60EFC3,
/* [173] */ 0xA867DF55,
/* [174] */ 0x316E8EEF,
/* [175] */ 0x4669BE79,
/* [176] */ 0xCB61B38C,
/* [177] */ 0xBC66831A,
/* [178] */ 0x256FD2A0,
/* [179] */ 0x5268E236,
/* [180] */ 0xCC0C7795,
/* [181] */ 0xBB0B4703,
/* [182] */ 0x220216B9,
/* [183] */ 0x5505262F,
/* [184] */ 0xC5BA3BBE,
/* [185] */ 0xB2BD0B28,
/* [186] */ 0x2BB45A92,
/* [187] */ 0x5CB36A04,
/* [188] */ 0xC2D7FFA7,
/* [189] */ 0xB5D0CF31,
/* [190] */ 0x2CD99E8B,
/* [191] */ 0x5BDEAE1D,
/* [192] */ 0x9B64C2B0,
/* [193] */ 0xEC63F226,
/* [194] */ 0x756AA39C,
/* [195] */ 0x026D930A,
/* [196] */ 0x9C0906A9,
/* [197] */ 0xEB0E363F,
/* [198] */ 0x72076785,
/* [199] */ 0x05005713,
/* [200] */ 0x95BF4A82,
/* [201] */ 0xE2B87A14,
/* [202] */ 0x7BB12BAE,
/* [203] */ 0x0CB61B38,
/* [204] */ 0x92D28E9B,
/* [205] */ 0xE5D5BE0D,
/* [206] */ 0x7CDCEFB7,
/* [207] */ 0x0BDBDF21,
/* [208] */ 0x86D3D2D4,
/* [209] */ 0xF1D4E242,
/* [210] */ 0x68DDB3F8,
/* [211] */ 0x1FDA836E,
/* [212] */ 0x81BE16CD,
/* [213] */ 0xF6B9265B,
/* [214] */ 0x6FB077E1,
/* [215] */ 0x18B74777,
/* [216] */ 0x88085AE6,
/* [217] */ 0xFF0F6A70,
/* [218] */ 0x66063BCA,
/* [219] */ 0x11010B5C,
/* [220] */ 0x8F659EFF,
/* [221] */ 0xF862AE69,
/* [222] */ 0x616BFFD3,
/* [223] */ 0x166CCF45,
/* [224] */ 0xA00AE278,
/* [225] */ 0xD70DD2EE,
/* [226] */ 0x4E048354,
/* [227] */ 0x3903B3C2,
/* [228] */ 0xA7672661,
/* [229] */ 0xD06016F7,
/* [230] */ 0x4969474D,
/* [231] */ 0x3E6E77DB,
/* [232] */ 0xAED16A4A,
/* [233] */ 0xD9D65ADC,
/* [234] */ 0x40DF0B66,
/* [235] */ 0x37D83BF0,
/* [236] */ 0xA9BCAE53,
/* [237] */ 0xDEBB9EC5,
/* [238] */ 0x47B2CF7F,
/* [239] */ 0x30B5FFE9,
/* [240] */ 0xBDBDF21C,
/* [241] */ 0xCABAC28A,
/* [242] */ 0x53B39330,
/* [243] */ 0x24B4A3A6,
/* [244] */ 0xBAD03605,
/* [245] */ 0xCDD70693,
/* [246] */ 0x54DE5729,
/* [247] */ 0x23D967BF,
/* [248] */ 0xB3667A2E,
/* [249] */ 0xC4614AB8,
/* [250] */ 0x5D681B02,
/* [251] */ 0x2A6F2B94,
/* [252] */ 0xB40BBE37,
/* [253] */ 0xC30C8EA1,
/* [254] */ 0x5A05DF1B,
/* [255] */ 0x2D02EF8D
};
//It is known that the XOR of all of the table values above is 0,
//and that the sum is 0xFFFFFF80. This is used to check the table
//for corruption on demand.
#define CRCHASHFUNCS_CRC32TABLE_XOR (0x00000000)
#define CRCHASHFUNCS_CRC32TABLE_SUM (0xFFFFFF80)
//Rotates an unsigned int left with wraparound.
static unsigned CRCHASHFUNCS_Crc32RotateLeftWithWrap(unsigned arg)
{
if (arg & 0x80000000)
{
arg <<= 1;
arg |= (unsigned)1;
}
else
{
arg <<= 1;
arg &= 0xFFFFFFFE;
}
return(arg);
}
//Appears to swap the bits in a data value, bit 0 for bit 7, bit 1
//for bit 6, etc. Obtained from the Internet (Richard A. Ellingson).
static unsigned CRCHASHFUNCS_Crc32Reflect(unsigned ref,
unsigned char ch)
{
unsigned i;
unsigned value;
value = 0;
for (i=1; i<((unsigned)(ch+1)); i++)
{
if (ref & 1)
{
value |= (1 << (ch-i));
}
ref >>= 1;
}
return(value);
}
//Returns !=0 if the internal table is alright.
int CRCHASHFUNCS_Crc32TableCheck(void)
{
int i;
unsigned xor_val;
unsigned sum_val;
xor_val = sum_val = 0;
for (i=0; i<256; i++)
{
xor_val ^= CRCHASHFUNCS_crc32tab[i];
sum_val += CRCHASHFUNCS_crc32tab[i];
}
return((xor_val == CRCHASHFUNCS_CRC32TABLE_XOR) &&
(sum_val == CRCHASHFUNCS_CRC32TABLE_SUM));
}
//Initializes a CRC state struct. This will be added to, the CRC will be
//extracted, and the data structure will finally be closed.
void CRCHASHFUNCS_Crc32StateStructOpen(struct CRCHASHFUNCS_Crc32StateStruct *arg)
{
arg->crc = 0xFFFFFFFF;
}
//Adds data to the data structure.
void CRCHASHFUNCS_Crc32StateStructAddData(struct CRCHASHFUNCS_Crc32StateStruct *arg,
void *data,
unsigned len)
{
assert(arg != NULL);
assert(data != NULL);
while (len--)
{
arg->crc = (arg->crc >> 8) ^ CRCHASHFUNCS_crc32tab[((arg->crc & 0xFF) ^ *((unsigned char *)data)) & 0xFF];
data = (unsigned char *)data + 1;
}
}
unsigned CRCHASHFUNCS_Crc32Extract(struct CRCHASHFUNCS_Crc32StateStruct *arg)
{
assert(arg != NULL);
return(arg->crc ^ 0xFFFFFFFF);
}
void CRCHASHFUNCS_Crc32StateStructClose(struct CRCHASHFUNCS_Crc32StateStruct *arg)
{
assert(arg != NULL);
//Do nothing at this time.
}
//Returns version control string for file.
//
const char *CRCHASHFUNCS_cvcinfo(void)
{
return ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/crchashfuncs.c,v 1.3 2001/07/26 21:41:21 dtashley Exp $");
}
//Returns version control string for associated .H file.
//
const char *CRCHASHFUNCS_hvcinfo(void)
{
return (CRCHASHFUNCS_H_VERSION);
}
// $Log: crchashfuncs.c,v $
// Revision 1.3 2001/07/26 21:41:21 dtashley
// Completion of CRC32 utility, and the CRCHASHFUNCS module.
//
// Revision 1.2 2001/07/26 05:01:49 dtashley
// Keyword expansion corrected.
//
// End of CRCHASHFUNCS.C.