1 files changed, 81 insertions, 0 deletions
diff --git a/src/common/src/crc.h b/src/common/src/crc.h
new file mode 100644
index 00000000..2bb3210d
--- /dev/null
+++ b/src/common/src/crc.h
@@ -0,0 +1,81 @@
+#ifndef COMMON_CRC_H_
+#define COMMON_CRC_H_
+
+#include "types.h"
+#include "platform.h"
+
+#define CRC_ROTL(crc) crc32_table[3][((crc) & 0xFF)] ^ crc32_table[2][((crc >> 8) & 0xFF)] ^ \
+        crc32_table[1][((crc >> 16) & 0xFF)] ^ crc32_table[0][((crc >> 24))]
+
+// Some definitions for using the X86 CRC32 instruction on different platforms. Keep in mind, you 
+// should check for X86/X64 architecture support before using these, as well as for SSE 4.2 (see the
+// x86_utils module).
+
+#if defined(EMU_ARCHITECTURE_X86) || defined(EMU_ARCHITECTURE_X64)
+
+#if EMU_PLATFORM == PLATFORM_WINDOWS
+
+#include <nmmintrin.h>
+
+#ifdef EMU_ARCHITECTURE_X64
+static inline u64 InlineCrc32_U64(u64 crc, u64 value) {
+    return _mm_crc32_u64(crc, value);
+}
+#endif
+static inline u32 InlineCrc32_U32(u32 crc, u64 value) {
+    return _mm_crc32_u32(crc, static_cast<u32>(value));
+}
+
+static inline u32 InlineCrc32_U8(u32 crc, u8 value) {
+    return _mm_crc32_u8(crc, value);
+}
+
+#elif GCC_VERSION_AVAILABLE(4, 5) && defined(__SSE4_2__)
+
+extern inline unsigned int __attribute__((
+    __gnu_inline__, __always_inline__, __artificial__))
+InlineCrc32_U8(unsigned int __C, unsigned char __V) {
+    return __builtin_ia32_crc32qi(__C, __V);
+}
+#ifdef EMU_ARCHITECTURE_X64
+extern inline unsigned long long __attribute__((
+    __gnu_inline__, __always_inline__, __artificial__))
+InlineCrc32_U64(unsigned long long __C, unsigned long long __V) {
+    return __builtin_ia32_crc32di(__C, __V);
+}
+#else
+extern inline unsigned int __attribute__((
+    __gnu_inline__, __always_inline__, __artificial__))
+InlineCrc32_U32(unsigned int __C, unsigned int __V) {
+    return __builtin_ia32_crc32si (__C, __V);
+}
+#endif  // EMU_ARCHITECTURE_X64
+
+#else
+
+// GCC 4.4.x and earlier: use inline asm, or msse4.2 flag not set
+
+static inline u64 InlineCrc32_U64(u64 crc, u64 value) {
+    asm("crc32q %[value], %[crc]\n" : [crc] "+r" (crc) : [value] "rm" (value));
+    return crc;
+}
+
+static inline u32 InlineCrc32_U32(u32 crc, u64 value) {
+    asm("crc32l %[value], %[crc]\n" : [crc] "+r" (crc) : [value] "rm" (value));
+    return crc;
+}
+
+static inline u32 InlineCrc32_U8(u32 crc, u8 value) {
+    asm("crc32b %[value], %[crc]\n" : [crc] "+r" (crc) : [value] "rm" (value));
+    return crc;
+}
+#endif
+
+#endif  // EMU_ARCHITECTURE_X86 or EMU_ARCHITECTURE_X64
+
+extern u32 crc32_table[4][256];
+
+void Init_CRC32_Table();
+u32 GenerateCRC(u8 *StartAddr, u32 Len);
+
+#endif // COMMON_CRC_H_