222 lines
11 KiB
C++
222 lines
11 KiB
C++
/*
|
|
** Command & Conquer Renegade(tm)
|
|
** Copyright 2025 Electronic Arts 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/***********************************************************************************************
|
|
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
|
|
***********************************************************************************************
|
|
* *
|
|
* Project Name : Command & Conquer *
|
|
* *
|
|
* $Archive:: /Commando/Code/wwlib/CRC.CPP $*
|
|
* *
|
|
* $Author:: Eric_c $*
|
|
* *
|
|
* $Modtime:: 10/22/98 2:46p $*
|
|
* *
|
|
* $Revision:: 2 $*
|
|
* *
|
|
*---------------------------------------------------------------------------------------------*
|
|
* Functions: *
|
|
* CRCEngine::operator() -- Submits one byte of data to the CRC engine. *
|
|
* CRCEngine::operator() -- Submits an arbitrary data block to the CRC engine. *
|
|
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
|
|
|
|
#include "always.h"
|
|
#include "crc.h"
|
|
|
|
|
|
/***********************************************************************************************
|
|
* CRCEngine::operator() -- Submits one byte of data to the CRC engine. *
|
|
* *
|
|
* This routine will take the specified byte of data and submit it to the CRC engine *
|
|
* for processing. This routine is designed to be as fast as possible since the typical *
|
|
* use of this routine is to feed one of presumably many byte sized chunks of data to the *
|
|
* CRC engine. *
|
|
* *
|
|
* INPUT: datum -- One byte of data to submit to the CRC engine. *
|
|
* *
|
|
* OUTPUT: none *
|
|
* *
|
|
* WARNINGS: If possible, use the buffer/size operator to submit data rather than repeated *
|
|
* calls to this routine. *
|
|
* *
|
|
* HISTORY: *
|
|
* 03/02/1996 JLB : Created. *
|
|
*=============================================================================================*/
|
|
void CRCEngine::operator() (char datum)
|
|
{
|
|
StagingBuffer.Buffer[Index++] = datum;
|
|
|
|
if (Index == sizeof(long)) {
|
|
CRC = Value();
|
|
StagingBuffer.Composite = 0;
|
|
Index = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/***********************************************************************************************
|
|
* CRCEngine::operator() -- Submits an arbitrary data block to the CRC engine. *
|
|
* *
|
|
* This routine will submit the specified block to the CRC engine. The block can be of *
|
|
* arbitrary length. *
|
|
* *
|
|
* INPUT: buffer -- Pointer to the buffer that contains the data. The buffer will not *
|
|
* be modified. *
|
|
* *
|
|
* length -- The length of the buffer (in bytes). *
|
|
* *
|
|
* OUTPUT: Returns with the current CRC value accumulated so far. *
|
|
* *
|
|
* WARNINGS: none *
|
|
* *
|
|
* HISTORY: *
|
|
* 03/02/1996 JLB : Created. *
|
|
*=============================================================================================*/
|
|
long CRCEngine::operator() (void const * buffer, int length)
|
|
{
|
|
if (buffer != NULL && length > 0) {
|
|
char const * dataptr = (char const *)buffer;
|
|
int bytes_left = length;
|
|
|
|
/*
|
|
** If there are any leader bytes (needed to fill the staging buffer)
|
|
** then process those by first using them to fill up the staging
|
|
** buffer. The bulk of the data block will be processed by the high
|
|
** speed longword processing loop.
|
|
*/
|
|
while (bytes_left && Buffer_Needs_Data()) {
|
|
operator()(*dataptr);
|
|
dataptr++;
|
|
bytes_left--;
|
|
}
|
|
|
|
/*
|
|
** Perform the fast 'bulk' processing by reading long word sized
|
|
** data blocks.
|
|
*/
|
|
long const * longptr = (long const *)dataptr;
|
|
int longcount = bytes_left / sizeof(long); // Whole 'long' elements remaining.
|
|
while (longcount--) {
|
|
CRC = _lrotl(CRC, 1) + *longptr++;
|
|
bytes_left -= sizeof(long);
|
|
}
|
|
|
|
/*
|
|
** If there are remainder bytes, then process these by adding them
|
|
** to the staging buffer.
|
|
*/
|
|
dataptr = (char const *)longptr;
|
|
while (bytes_left) {
|
|
operator()(*dataptr);
|
|
dataptr++;
|
|
bytes_left--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Return the current CRC value.
|
|
*/
|
|
return(Value());
|
|
}
|
|
// CRC for poly 0x04C11DB7
|
|
unsigned long CRC::_Table[ 256 ] =
|
|
{
|
|
0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
|
|
0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
|
|
0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
|
|
0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
|
|
0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
|
|
0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
|
|
0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
|
|
0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
|
|
0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
|
|
0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
|
|
0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
|
|
0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
|
|
0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
|
|
0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
|
|
0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
|
|
0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
|
|
0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
|
|
0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
|
|
0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
|
|
0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
|
|
0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
|
|
0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
|
|
0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
|
|
0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
|
|
0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
|
|
0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
|
|
0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
|
|
0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
|
|
0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
|
|
0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
|
|
0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
|
|
0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
|
|
0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
|
|
0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
|
|
0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
|
|
0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
|
|
0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
|
|
0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
|
|
0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
|
|
0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
|
|
0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
|
|
0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
|
|
0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
|
|
0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
|
|
0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
|
|
0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
|
|
0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
|
|
0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
|
|
0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
|
|
0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
|
|
0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
|
|
0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
|
|
0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
|
|
0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
|
|
0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
|
|
0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
|
|
0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
|
|
0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
|
|
0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
|
|
0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
|
|
0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
|
|
0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
|
|
0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
|
|
0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
|
|
};
|
|
|
|
unsigned long CRC::Memory( unsigned char *data, unsigned long length, unsigned long crc )
|
|
{
|
|
crc ^= 0xFFFFFFFF; // invert previous CRC
|
|
while ( length-- ) {
|
|
crc = CRC32( *data++, crc ); // calc crc for each byte
|
|
}
|
|
return (crc ^ 0xFFFFFFFF); // invert new CRC and return it
|
|
}
|
|
|
|
unsigned long CRC::String( const char *string, unsigned long crc)
|
|
{
|
|
crc ^= 0xFFFFFFFF; // invert previous CRC
|
|
while ( *string ) {
|
|
crc = CRC32( *string++, crc ); // calc crc for each byte
|
|
}
|
|
return (crc ^ 0xFFFFFFFF); // invert new CRC and return it
|
|
}
|