winamp/Src/nde/Crc.cpp

#include "nde.h"
#include <stdio.h>

static unsigned int crc_32_tab[] = {
	0xD202Ef8dL, 0xA505DF1BL, 0x3C0C8EA1L, 0x4B0BBE37L, 0xD56F2B94L, 0xA2681B02L, 0x3B614AB8L, 0x4C667A2EL,
	0xDCD967BFL, 0xABDE5729L, 0x32D70693L, 0x45D03605L, 0xDBB4A3A6L, 0xACB39330L, 0x35BAC28AL, 0x42BDF21CL,
	0xCFB5FFE9L, 0xB8B2CF7FL, 0x21BB9EC5L, 0x56BCAE53L, 0xC8D83BF0L, 0xBFDF0B66L, 0x26D65ADCL, 0x51D16A4AL,
	0xC16E77DBL, 0xB669474DL, 0x2F6016F7L, 0x58672661L, 0xC603B3C2L, 0xB1048354L, 0x280DD2EEL, 0x5F0AE278L,
	0xE96CCF45L, 0x9E6BFFD3L, 0x0762AE69L, 0x70659EFFL, 0xEE010B5CL, 0x99063BCAL, 0x000F6A70L, 0x77085AE6L,
	0xE7B74777L, 0x90B077E1L, 0x09B9265BL, 0x7EBE16CDL, 0xE0DA836EL, 0x97DDB3F8L, 0x0ED4E242L, 0x79D3D2D4L,
	0xF4DBDF21L, 0x83DCEFB7L, 0x1AD5BE0DL, 0x6DD28E9BL, 0xF3B61B38L, 0x84B12BAEL, 0x1DB87A14L, 0x6ABF4A82L,
	0xFA005713L, 0x8D076785L, 0x140E363FL, 0x630906A9L, 0xFD6D930AL, 0x8A6AA39CL, 0x1363F226L, 0x6464C2B0L,
	0xA4DEAE1DL, 0xD3D99E8BL, 0x4AD0CF31L, 0x3DD7FFA7L, 0xA3B36A04L, 0xD4B45A92L, 0x4DBD0B28L, 0x3ABA3BBEL,
	0xAA05262FL, 0xDD0216B9L, 0x440B4703L, 0x330C7795L, 0xAD68E236L, 0xDA6FD2A0L, 0x4366831AL, 0x3461B38CL,
	0xB969BE79L, 0xCE6E8EEFL, 0x5767DF55L, 0x2060EFC3L, 0xBE047A60L, 0xC9034AF6L, 0x500A1B4CL, 0x270D2BDAL,
	0xB7B2364BL, 0xC0B506DDL, 0x59BC5767L, 0x2EBB67F1L, 0xB0DFF252L, 0xC7D8C2C4L, 0x5ED1937EL, 0x29D6A3E8L,
	0x9FB08ED5L, 0xE8B7BE43L, 0x71BEEFF9L, 0x06B9DF6FL, 0x98DD4ACCL, 0xEFDA7A5AL, 0x76D32BE0L, 0x01D41B76L,
	0x916B06E7L, 0xE66C3671L, 0x7F6567CBL, 0x0862575DL, 0x9606C2FEL, 0xE101F268L, 0x7808A3D2L, 0x0F0F9344L,
	0x82079EB1L, 0xF500AE27L, 0x6C09FF9DL, 0x1B0ECF0BL, 0x856A5AA8L, 0xF26D6A3EL, 0x6B643B84L, 0x1C630B12L,
	0x8CDC1683L, 0xFBDB2615L, 0x62D277AFL, 0x15D54739L, 0x8BB1D29AL, 0xFCB6E20CL, 0x65BFB3B6L, 0x12B88320L,
	0x3FBA6CADL, 0x48BD5C3BL, 0xD1B40D81L, 0xA6B33D17L, 0x38D7A8B4L, 0x4FD09822L, 0xD6D9C998L, 0xA1DEF90EL,
	0x3161E49FL, 0x4666D409L, 0xDF6F85B3L, 0xA868B525L, 0x360C2086L, 0x410B1010L, 0xD80241AAL, 0xAF05713CL,
	0x220D7CC9L, 0x550A4C5FL, 0xCC031DE5L, 0xBB042D73L, 0x2560B8D0L, 0x52678846L, 0xCB6ED9FCL, 0xBC69E96AL,
	0x2CD6F4FBL, 0x5BD1C46DL, 0xC2D895D7L, 0xB5DFA541L, 0x2BBB30E2L, 0x5CBC0074L, 0xC5B551CEL, 0xB2B26158L,
	0x04D44C65L, 0x73D37CF3L, 0xEADA2D49L, 0x9DDD1DDFL, 0x03B9887CL, 0x74BEB8EAL, 0xEDB7E950L, 0x9AB0D9C6L,
	0x0A0FC457L, 0x7D08F4C1L, 0xE401A57BL, 0x930695EDL, 0x0D62004EL, 0x7A6530D8L, 0xE36C6162L, 0x946B51F4L,
	0x19635C01L, 0x6E646C97L, 0xF76D3D2DL, 0x806A0DBBL, 0x1E0E9818L, 0x6909A88EL, 0xF000F934L, 0x8707C9A2L,
	0x17B8D433L, 0x60BFE4A5L, 0xF9B6B51FL, 0x8EB18589L, 0x10D5102AL, 0x67D220BCL, 0xFEDB7106L, 0x89DC4190L,
	0x49662D3DL, 0x3E611DABL, 0xA7684C11L, 0xD06F7C87L, 0x4E0BE924L, 0x390CD9B2L, 0xA0058808L, 0xD702B89EL,
	0x47BDA50FL, 0x30BA9599L, 0xA9B3C423L, 0xDEB4F4B5L, 0x40D06116L, 0x37D75180L, 0xAEDE003AL, 0xD9D930ACL,
	0x54D13D59L, 0x23D60DCFL, 0xBADF5C75L, 0xCDD86CE3L, 0x53BCF940L, 0x24BBC9D6L, 0xBDB2986CL, 0xCAB5A8FAL,
	0x5A0AB56BL, 0x2D0D85FDL, 0xB404D447L, 0xC303E4D1L, 0x5D677172L, 0x2A6041E4L, 0xB369105EL, 0xC46E20C8L,
	0x72080DF5L, 0x050F3D63L, 0x9C066CD9L, 0xEB015C4FL, 0x7565C9ECL, 0x0262F97AL, 0x9B6BA8C0L, 0xEC6C9856L,
	0x7CD385C7L, 0x0BD4B551L, 0x92DDE4EBL, 0xE5DAD47DL, 0x7BBE41DEL, 0x0CB97148L, 0x95B020F2L, 0xE2B71064L,
	0x6FBF1D91L, 0x18B82D07L, 0x81B17CBDL, 0xF6B64C2BL, 0x68D2D988L, 0x1FD5E91EL, 0x86DCB8A4L, 0xF1DB8832L,
	0x616495A3L, 0x1663A535L, 0x8F6AF48FL, 0xF86DC419L, 0x660951BAL, 0x110E612CL, 0x88073096L, 0xFF000000L
};

#define UPDC32(octet, crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))

unsigned long int crc32file(char *name)
{
	register FILE *fin;
	register unsigned int oldcrc32;
	register unsigned int crc32;
	register unsigned int oldcrc;
	register unsigned char c;

	oldcrc32 = 0;
	if ((fin=fopen(name, "rb"))==NULL)
		return 0;
	while (1) {
		c=getc(fin);
		if (feof(fin)) break;
		oldcrc32 = UPDC32(c, oldcrc32);
	}

	if (ferror(fin)){
		fclose(fin);
		return 0;
	}
	else {
		crc32 = oldcrc32;  oldcrc = oldcrc32 = ~oldcrc32;

		fclose(fin);

		return crc32;
	}
}

unsigned long int crc32str(char *name)
{
	register unsigned int oldcrc32;
	register unsigned int crc32;
	register unsigned char c;
	register int a=0;

	oldcrc32 = 0;
	while (name[a] != 0) {
		c=name[a];
		oldcrc32 = UPDC32(c, oldcrc32);
		a++;
	}

	crc32 = oldcrc32;  oldcrc32 = oldcrc32;

	return crc32;
}