| /* 7zCrc.c */ |
| |
| #include "7zCrc.h" |
| |
| #define kCrcPoly 0xEDB88320 |
| UInt32 g_CrcTable[256]; |
| |
| void MY_FAST_CALL CrcGenerateTable() |
| { |
| 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; |
| } |