diff options
Diffstat (limited to 'src/libs/7zip/unix/C/XzCrc64.c')
-rw-r--r-- | src/libs/7zip/unix/C/XzCrc64.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/libs/7zip/unix/C/XzCrc64.c b/src/libs/7zip/unix/C/XzCrc64.c new file mode 100644 index 000000000..0369554b7 --- /dev/null +++ b/src/libs/7zip/unix/C/XzCrc64.c @@ -0,0 +1,33 @@ +/* XzCrc64.c -- CRC64 calculation +2010-04-16 : Igor Pavlov : Public domain */ + +#include "XzCrc64.h" + +#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42) +UInt64 g_Crc64Table[256]; + +void MY_FAST_CALL Crc64GenerateTable(void) +{ + UInt32 i; + for (i = 0; i < 256; i++) + { + UInt64 r = i; + int j; + for (j = 0; j < 8; j++) + r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1)); + g_Crc64Table[i] = r; + } +} + +UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size) +{ + const Byte *p = (const Byte *)data; + for (; size > 0 ; size--, p++) + v = CRC64_UPDATE_BYTE(v, *p); + return v; +} + +UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size) +{ + return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size)); +} |