Crc.c Source File

00001 /*
00002  *    gui - [gega user interface] the flexible solution for user interface problems
00003  *    Copyright (C) 2002  Gergely Gati
00004  *
00005  *    This program is free software; you can redistribute it and/or modify
00006  *    it under the terms of the GNU General Public License as published by
00007  *    the Free Software Foundation; version 2 of the License.
00008  *
00009  *    This program is distributed in the hope that it will be useful,
00010  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *    GNU General Public License for more details.
00013  *
00014  *    You should have received a copy of the GNU General Public License
00015  *    along with this program; if not, write to the Free Software
00016  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00017  *
00018  *    Gergely Gati
00019  *      email:           g.gati@freemail.hu
00020  *      AIM screenname:  GatiGergely
00021  *      ICQ number:      93131690
00022  *
00023  */
00024 /*
00025  * Copyright Francesco Ferrara, 1998 <francesco@aerra.it>
00026  *
00027  * Used by kind permission, 14th October 1998. http://www.aerre.it/francesco
00028  *
00029  *
00030  */
00031 
00032 #include "Crc.h"
00033 
00034 u32 crc_CalcBuffer(u8 *buffer, int count)
00035 {
00036   static unsigned long CRCTable[256] =
00037   {
00038     0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,
00039     0xE963A535,0x9E6495A3,0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,
00040     0x09B64C2B,0x7EB17CBD,0xE7B82D07,0x90BF1D91,0x1DB71064,0x6AB020F2,
00041     0xF3B97148,0x84BE41DE,0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,
00042     0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,
00043     0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4,0xA2677172,
00044     0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,0x35B5A8FA,0x42B2986C,
00045     0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,
00046     0x26D930AC,0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,
00047     0xCFBA9599,0xB8BDA50F,0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,
00048     0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,0x76DC4190,0x01DB7106,
00049     0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,0x9FBFE4A5,0xE8B8D433,
00050     0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x086D3D2D,
00051     0x91646C97,0xE6635C01,0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,
00052     0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,
00053     0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,
00054     0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,
00055     0xA4D1C46D,0xD3D6F4FB,0x4369E96A,0x346ED9FC,0xAD678846,0xDA60B8D0,
00056     0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9,0x5005713C,0x270241AA,
00057     0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
00058     0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81,
00059     0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,
00060     0xEAD54739,0x9DD277AF,0x04DB2615,0x73DC1683,0xE3630B12,0x94643B84,
00061     0x0D6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,
00062     0xF00F9344,0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,
00063     0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0,0x10DA7A5A,0x67DD4ACC,
00064     0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,0xD6D6A3E8,0xA1D1937E,
00065     0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B,
00066     0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,
00067     0x316E8EEF,0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,
00068     0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,0xC5BA3BBE,0xB2BD0B28,
00069     0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,
00070     0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A,0x9C0906A9,0xEB0E363F,
00071     0x72076785,0x05005713,0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,
00072     0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242,
00073     0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,
00074     0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,
00075     0x616BFFD3,0x166CCF45,0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,
00076     0xA7672661,0xD06016F7,0x4969474D,0x3E6E77DB,0xAED16A4A,0xD9D65ADC,
00077     0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
00078     0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,0xCDD70693,
00079     0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94,
00080     0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D
00081   };
00082   u32 crc=0xffffffff;
00083   int i;
00084 
00085   for(i=0;i<count;i++) crc=(crc>>8)^CRCTable[(buffer[i]^crc)&0xff];
00086   crc^=0xffffffff;
00087 
00088   return(crc);
00089 }
00090