diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
| commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
| tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /other-licenses/7zstub/src/C/XzCrc64.c | |
| parent | Initial commit. (diff) | |
| download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip | |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'other-licenses/7zstub/src/C/XzCrc64.c')
| -rw-r--r-- | other-licenses/7zstub/src/C/XzCrc64.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/C/XzCrc64.c b/other-licenses/7zstub/src/C/XzCrc64.c new file mode 100644 index 0000000000..e9ca9ec265 --- /dev/null +++ b/other-licenses/7zstub/src/C/XzCrc64.c @@ -0,0 +1,86 @@ +/* XzCrc64.c -- CRC64 calculation
+2017-05-23 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+#include "XzCrc64.h"
+#include "CpuArch.h"
+
+#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
+
+#ifdef MY_CPU_LE
+ #define CRC64_NUM_TABLES 4
+#else
+ #define CRC64_NUM_TABLES 5
+ #define CRC_UINT64_SWAP(v) \
+ ((v >> 56) \
+ | ((v >> 40) & ((UInt64)0xFF << 8)) \
+ | ((v >> 24) & ((UInt64)0xFF << 16)) \
+ | ((v >> 8) & ((UInt64)0xFF << 24)) \
+ | ((v << 8) & ((UInt64)0xFF << 32)) \
+ | ((v << 24) & ((UInt64)0xFF << 40)) \
+ | ((v << 40) & ((UInt64)0xFF << 48)) \
+ | ((v << 56)))
+
+ UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
+#endif
+
+#ifndef MY_CPU_BE
+ UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table);
+#endif
+
+typedef UInt64 (MY_FAST_CALL *CRC64_FUNC)(UInt64 v, const void *data, size_t size, const UInt64 *table);
+
+static CRC64_FUNC g_Crc64Update;
+UInt64 g_Crc64Table[256 * CRC64_NUM_TABLES];
+
+UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
+{
+ return g_Crc64Update(v, data, size, g_Crc64Table);
+}
+
+UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
+{
+ return g_Crc64Update(CRC64_INIT_VAL, data, size, g_Crc64Table) ^ CRC64_INIT_VAL;
+}
+
+void MY_FAST_CALL Crc64GenerateTable()
+{
+ UInt32 i;
+ for (i = 0; i < 256; i++)
+ {
+ UInt64 r = i;
+ unsigned j;
+ for (j = 0; j < 8; j++)
+ r = (r >> 1) ^ (kCrc64Poly & ((UInt64)0 - (r & 1)));
+ g_Crc64Table[i] = r;
+ }
+ for (i = 256; i < 256 * CRC64_NUM_TABLES; i++)
+ {
+ UInt64 r = g_Crc64Table[(size_t)i - 256];
+ g_Crc64Table[i] = g_Crc64Table[r & 0xFF] ^ (r >> 8);
+ }
+
+ #ifdef MY_CPU_LE
+
+ g_Crc64Update = XzCrc64UpdateT4;
+
+ #else
+ {
+ #ifndef MY_CPU_BE
+ UInt32 k = 1;
+ if (*(const Byte *)&k == 1)
+ g_Crc64Update = XzCrc64UpdateT4;
+ else
+ #endif
+ {
+ for (i = 256 * CRC64_NUM_TABLES - 1; i >= 256; i--)
+ {
+ UInt64 x = g_Crc64Table[(size_t)i - 256];
+ g_Crc64Table[i] = CRC_UINT64_SWAP(x);
+ }
+ g_Crc64Update = XzCrc64UpdateT1_BeT4;
+ }
+ }
+ #endif
+}
|