4.45 beta

C/7zCrcT8.c

@@ -0,0 +1,40 @@
+/* 7zCrc.c */
+
+#include "7zCrc.h"
+
+#define kCrcPoly 0xEDB88320
+#define CRC_NUM_TABLES 8
+
+UInt32 g_CrcTable[256 * CRC_NUM_TABLES];
+
+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;
+  }
+  #if CRC_NUM_TABLES > 1
+  for (; i < 256 * CRC_NUM_TABLES; i++)
+  {
+    UInt32 r = g_CrcTable[i - 256];
+    g_CrcTable[i] = g_CrcTable[r & 0xFF] ^ (r >> 8);
+  }
+  #endif
+}
+
+UInt32 MY_FAST_CALL CrcUpdateT8(UInt32 v, const void *data, size_t size, const UInt32 *table);
+
+UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
+{
+  return CrcUpdateT8(v, data, size, g_CrcTable);
+}
+
+UInt32 MY_FAST_CALL CrcCalc(const void *data, size_t size)
+{
+  return CrcUpdateT8(CRC_INIT_VAL, data, size, g_CrcTable) ^ 0xFFFFFFFF;
+}