Compression algo dependencies, still need hackery...

depends/lzma/pavlov/7zCrc.c

@@ -0,0 +1,35 @@
+/* 7zCrc.c -- CRC32 calculation
+2008-08-05
+Igor Pavlov
+Public domain */
+
+#include "7zCrc.h"
+
+#define kCrcPoly 0xEDB88320
+uint32_t g_CrcTable[256];
+
+void MY_FAST_CALL CrcGenerateTable(void)
+{
+	uint32_t i;
+	for (i = 0; i < 256; i++)
+	{
+		uint32_t r = i;
+		int j;
+		for (j = 0; j < 8; j++)
+			r = (r >> 1) ^ (kCrcPoly & ~((r & 1) - 1));
+		g_CrcTable[i] = r;
+	}
+}
+
+uint32_t MY_FAST_CALL CrcUpdate(uint32_t v, const void *data, size_t size)
+{
+	const uint8_t *p = (const uint8_t *)data;
+	for (; size > 0; size--, p++)
+		v = CRC_UPDATE_BYTE(v, *p);
+	return v;
+}
+
+uint32_t MY_FAST_CALL CrcCalc(const void *data, size_t size)
+{
+	return CrcUpdate(CRC_INIT_VAL, data, size) ^ 0xFFFFFFFF;
+}