/* 7zCrc.c */



#include "7zCrc.h"



#define kCrcPoly 0xEDB88320

UInt32 g_CrcTable[256];



void MY_FAST_CALL CrcGenerateTable(void)

{

  UInt32 i;

  for (i = 0; i < 256; i++)

  {

    UInt32 r = i;

    int j;

    for (j = 0; j < 8; j++)

      r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));

    g_CrcTable[i] = r;

  }

}



UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)

{

  const Byte *p = (const Byte *)data;

  for (; size > 0 ; size--, p++) 

    v = CRC_UPDATE_BYTE(v, *p);

  return v;

}



UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)

{

  return CrcUpdate(CRC_INIT_VAL, data, size) ^ 0xFFFFFFFF;

}

