GTestAndEngine: crc32.c File Reference

Define Documentation

#define STEPCRC	(	crc,
		byte		)	crc = crc_table[((int)crc ^ (byte)) & 0xff] ^ (crc >> 8)

Definition at line 80 of file crc32.c.

Referenced by CRC32_AddByte(), CRC32_AddLong(), CRC32_AddWord(), and CRC32_Array().

Function Documentation

uint32 CRC32_AddByte	(	uint32	crc,
		uint8	b
	)

Definition at line 92 of file crc32.c.

References STEPCRC, and uint32.

00093 {
00094         STEPCRC(crc,b);
00095 return(crc); 
00096 }

uint32 CRC32_AddLong	(	uint32	crc,
		uint32	l
	)

Definition at line 107 of file crc32.c.

References STEPCRC, uint32, and uint8.

00108 {
00109 uint8 *ptr;
00110         ptr = (uint8 *)&l;
00111         STEPCRC(crc,ptr[0]);
00112         STEPCRC(crc,ptr[1]);
00113         STEPCRC(crc,ptr[2]);
00114         STEPCRC(crc,ptr[3]);
00115 return(crc); 
00116 }

uint32 CRC32_AddWord	(	uint32	crc,
		uint16	w
	)

Definition at line 98 of file crc32.c.

References STEPCRC, uint32, and uint8.

00099 { 
00100 uint8 *ptr;
00101         ptr = (uint8 *)&w;
00102         STEPCRC(crc,ptr[0]);
00103         STEPCRC(crc,ptr[1]);
00104 return(crc); 
00105 }

uint32 CRC32_Array	(	const uint8 *	buf,
		uint32	buflen
	)

Definition at line 118 of file crc32.c.

References STEPCRC, and uint32.

Referenced by Hash_StringToKey().

00119 {
00120 uint32 crc = (~((uint32)0));
00121 
00122         if (!buf ) return 0;
00123 
00124         while( (buflen&0xF) != 0 )
00125         {
00126                 STEPCRC(crc,*buf); buf++;
00127                 buflen--;
00128         }
00129 
00130         buflen>>=4; /* 16 at a time */
00131 
00132         while(buflen--)
00133         {
00134                 STEPCRC(crc,*buf); buf++;
00135                 STEPCRC(crc,*buf); buf++;
00136                 STEPCRC(crc,*buf); buf++;
00137                 STEPCRC(crc,*buf); buf++;
00138 
00139                 STEPCRC(crc,*buf); buf++;
00140                 STEPCRC(crc,*buf); buf++;
00141                 STEPCRC(crc,*buf); buf++;
00142                 STEPCRC(crc,*buf); buf++;
00143 
00144                 STEPCRC(crc,*buf); buf++;
00145                 STEPCRC(crc,*buf); buf++;
00146                 STEPCRC(crc,*buf); buf++;
00147                 STEPCRC(crc,*buf); buf++;
00148 
00149                 STEPCRC(crc,*buf); buf++;
00150                 STEPCRC(crc,*buf); buf++;
00151                 STEPCRC(crc,*buf); buf++;
00152                 STEPCRC(crc,*buf); buf++;
00153         }
00154 
00155         crc ^= 0xFFFFFFFF;
00156 
00157 return crc;
00158 }

uint32 CRC32_Finish

(

uint32

crc

)

Definition at line 87 of file crc32.c.

References uint32.

00088 {
00089 return (~crc);
00090 }

uint32 CRC32_Start

(

void

)

Definition at line 82 of file crc32.c.

References uint32.

00083 {
00084 return (~((uint32)0));
00085 }


Defines
#define	STEPCRC(crc, byte) crc = crc_table[((int)crc ^ (byte)) & 0xff] ^ (crc >> 8)
Functions
uint32	CRC32_Start (void)
uint32	CRC32_Finish (uint32 crc)
uint32	CRC32_AddByte (uint32 crc, uint8 b)
uint32	CRC32_AddWord (uint32 crc, uint16 w)
uint32	CRC32_AddLong (uint32 crc, uint32 l)
uint32	CRC32_Array (const uint8 *buf, uint32 buflen)
Variables
uint32	crc_table [256]

crc32.c File Reference

Defines

Functions

Variables

Define Documentation

Function Documentation

Variable Documentation