diff options
Diffstat (limited to 'src/libs/3rdparty/7zip/unix/CPP/7zip/Compress/ByteSwap.cpp')
-rw-r--r-- | src/libs/3rdparty/7zip/unix/CPP/7zip/Compress/ByteSwap.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/libs/3rdparty/7zip/unix/CPP/7zip/Compress/ByteSwap.cpp b/src/libs/3rdparty/7zip/unix/CPP/7zip/Compress/ByteSwap.cpp new file mode 100644 index 000000000..645b6ffcd --- /dev/null +++ b/src/libs/3rdparty/7zip/unix/CPP/7zip/Compress/ByteSwap.cpp @@ -0,0 +1,73 @@ +// ByteSwap.cpp + +#include "StdAfx.h" + +#include "../../Common/MyCom.h" + +#include "../ICoder.h" + +#include "../Common/RegisterCodec.h" + +class CByteSwap2: + public ICompressFilter, + public CMyUnknownImp +{ +public: + MY_UNKNOWN_IMP + STDMETHOD(Init)(); + STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size); +}; + +class CByteSwap4: + public ICompressFilter, + public CMyUnknownImp +{ +public: + MY_UNKNOWN_IMP + STDMETHOD(Init)(); + STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size); +}; + +STDMETHODIMP CByteSwap2::Init() { return S_OK; } + +STDMETHODIMP_(UInt32) CByteSwap2::Filter(Byte *data, UInt32 size) +{ + const UInt32 kStep = 2; + UInt32 i; + for (i = 0; i + kStep <= size; i += kStep) + { + Byte b = data[i]; + data[i] = data[i + 1]; + data[i + 1] = b; + } + return i; +} + +STDMETHODIMP CByteSwap4::Init() { return S_OK; } + +STDMETHODIMP_(UInt32) CByteSwap4::Filter(Byte *data, UInt32 size) +{ + const UInt32 kStep = 4; + UInt32 i; + for (i = 0; i + kStep <= size; i += kStep) + { + Byte b0 = data[i]; + Byte b1 = data[i + 1]; + data[i] = data[i + 3]; + data[i + 1] = data[i + 2]; + data[i + 2] = b1; + data[i + 3] = b0; + } + return i; +} + +static void *CreateCodec2() { return (void *)(ICompressFilter *)(new CByteSwap2); } +static void *CreateCodec4() { return (void *)(ICompressFilter *)(new CByteSwap4); } + +static CCodecInfo g_CodecsInfo[] = +{ + { CreateCodec2, CreateCodec2, 0x020302, L"Swap2", 1, true }, + { CreateCodec4, CreateCodec4, 0x020304, L"Swap4", 1, true } +}; + +REGISTER_CODECS(ByteSwap) |