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-rw-r--r--src/liblzma/check/crc64_small.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/src/liblzma/check/crc64_small.c b/src/liblzma/check/crc64_small.c
new file mode 100644
index 00000000..112bc032
--- /dev/null
+++ b/src/liblzma/check/crc64_small.c
@@ -0,0 +1,54 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file crc64_small.c
+/// \brief CRC64 calculation (size-optimized)
+//
+// This code has been put into the public domain.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "check.h"
+
+
+static uint64_t crc64_table[256];
+
+
+static void
+crc64_init(void)
+{
+ static const uint64_t poly64 = UINT64_C(0xC96C5795D7870F42);
+
+ for (size_t b = 0; b < 256; ++b) {
+ uint64_t r = b;
+ for (size_t i = 0; i < 8; ++i) {
+ if (r & 1)
+ r = (r >> 1) ^ poly64;
+ else
+ r >>= 1;
+ }
+
+ crc64_table[b] = r;
+ }
+
+ return;
+}
+
+
+extern LZMA_API uint64_t
+lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
+{
+ mythread_once(crc64_init);
+
+ crc = ~crc;
+
+ while (size != 0) {
+ crc = crc64_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
+ --size;
+ }
+
+ return ~crc;
+}