diff options
Diffstat (limited to 'src/libs/7zip/unix/CPP/7zip/Compress/DeltaFilter.cpp')
-rw-r--r-- | src/libs/7zip/unix/CPP/7zip/Compress/DeltaFilter.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/libs/7zip/unix/CPP/7zip/Compress/DeltaFilter.cpp b/src/libs/7zip/unix/CPP/7zip/Compress/DeltaFilter.cpp new file mode 100644 index 000000000..2e421acf4 --- /dev/null +++ b/src/libs/7zip/unix/CPP/7zip/Compress/DeltaFilter.cpp @@ -0,0 +1,112 @@ +// DeltaFilter.cpp + +#include "StdAfx.h" + +#include "../../../C/Delta.h" + +#include "../Common/RegisterCodec.h" + +#include "BranchCoder.h" + +struct CDelta +{ + unsigned _delta; + Byte _state[DELTA_STATE_SIZE]; + CDelta(): _delta(1) {} + void DeltaInit() { Delta_Init(_state); } +}; + +class CDeltaEncoder: + public ICompressFilter, + public ICompressSetCoderProperties, + public ICompressWriteCoderProperties, + CDelta, + public CMyUnknownImp +{ +public: + MY_UNKNOWN_IMP2(ICompressSetCoderProperties, ICompressWriteCoderProperties) + STDMETHOD(Init)(); + STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size); + STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps); + STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream); +}; + +class CDeltaDecoder: + public ICompressFilter, + public ICompressSetDecoderProperties2, + CDelta, + public CMyUnknownImp +{ +public: + MY_UNKNOWN_IMP1(ICompressSetDecoderProperties2) + STDMETHOD(Init)(); + STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size); + STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size); +}; + +STDMETHODIMP CDeltaEncoder::Init() +{ + DeltaInit(); + return S_OK; +} + +STDMETHODIMP_(UInt32) CDeltaEncoder::Filter(Byte *data, UInt32 size) +{ + Delta_Encode(_state, _delta, data, size); + return size; +} + +STDMETHODIMP CDeltaEncoder::SetCoderProperties(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps) +{ + UInt32 delta = _delta; + for (UInt32 i = 0; i < numProps; i++) + { + const PROPVARIANT &prop = props[i]; + if (propIDs[i] != NCoderPropID::kDefaultProp || prop.vt != VT_UI4 || prop.ulVal < 1 || prop.ulVal > 256) + return E_INVALIDARG; + delta = prop.ulVal; + } + _delta = delta; + return S_OK; +} + +STDMETHODIMP CDeltaEncoder::WriteCoderProperties(ISequentialOutStream *outStream) +{ + Byte prop = (Byte)(_delta - 1); + return outStream->Write(&prop, 1, NULL); +} + +STDMETHODIMP CDeltaDecoder::Init() +{ + DeltaInit(); + return S_OK; +} + +STDMETHODIMP_(UInt32) CDeltaDecoder::Filter(Byte *data, UInt32 size) +{ + Delta_Decode(_state, _delta, data, size); + return size; +} + +STDMETHODIMP CDeltaDecoder::SetDecoderProperties2(const Byte *props, UInt32 size) +{ + if (size != 1) + return E_INVALIDARG; + _delta = (unsigned)props[0] + 1; + return S_OK; +} + +#define CREATE_CODEC(x) \ + static void *CreateCodec ## x() { return (void *)(ICompressFilter *)(new C ## x ## Decoder); } \ + static void *CreateCodec ## x ## Out() { return (void *)(ICompressFilter *)(new C ## x ## Encoder); } + +CREATE_CODEC(Delta) + +#define METHOD_ITEM(x, id, name) { CreateCodec ## x, CreateCodec ## x ## Out, id, name, 1, true } + +static CCodecInfo g_CodecsInfo[] = +{ + METHOD_ITEM(Delta, 3, L"Delta") +}; + +REGISTER_CODECS(Delta) |