diff options
| author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
|---|---|---|
| committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
| commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
| tree | 10027f336435511475e392454359edea8e25895d /other-licenses/7zstub/src/Common/CRC.cpp | |
| parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
| download | UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip | |
Add m-esr52 at 52.6.0
Diffstat (limited to 'other-licenses/7zstub/src/Common/CRC.cpp')
| -rw-r--r-- | other-licenses/7zstub/src/Common/CRC.cpp | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/Common/CRC.cpp b/other-licenses/7zstub/src/Common/CRC.cpp new file mode 100644 index 000000000..92bc009c2 --- /dev/null +++ b/other-licenses/7zstub/src/Common/CRC.cpp @@ -0,0 +1,61 @@ +// Common/CRC.cpp
+
+#include "StdAfx.h"
+
+#include "CRC.h"
+
+static const UInt32 kCRCPoly = 0xEDB88320;
+
+UInt32 CCRC::Table[256];
+
+void CCRC::InitTable()
+{
+ for (UInt32 i = 0; i < 256; i++)
+ {
+ UInt32 r = i;
+ for (int j = 0; j < 8; j++)
+ if (r & 1)
+ r = (r >> 1) ^ kCRCPoly;
+ else
+ r >>= 1;
+ CCRC::Table[i] = r;
+ }
+}
+
+class CCRCTableInit
+{
+public:
+ CCRCTableInit() { CCRC::InitTable(); }
+} g_CRCTableInit;
+
+void CCRC::UpdateByte(Byte b)
+{
+ _value = Table[((Byte)(_value)) ^ b] ^ (_value >> 8);
+}
+
+void CCRC::UpdateUInt16(UInt16 v)
+{
+ UpdateByte(Byte(v));
+ UpdateByte(Byte(v >> 8));
+}
+
+void CCRC::UpdateUInt32(UInt32 v)
+{
+ for (int i = 0; i < 4; i++)
+ UpdateByte((Byte)(v >> (8 * i)));
+}
+
+void CCRC::UpdateUInt64(UInt64 v)
+{
+ for (int i = 0; i < 8; i++)
+ UpdateByte((Byte)(v >> (8 * i)));
+}
+
+void CCRC::Update(const void *data, size_t size)
+{
+ UInt32 v = _value;
+ const Byte *p = (const Byte *)data;
+ for (; size > 0 ; size--, p++)
+ v = Table[((Byte)(v)) ^ *p] ^ (v >> 8);
+ _value = v;
+}
|