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-rwxr-xr-xCPP/7zip/Compress/DeltaFilter.cpp112
1 files changed, 112 insertions, 0 deletions
diff --git a/CPP/7zip/Compress/DeltaFilter.cpp b/CPP/7zip/Compress/DeltaFilter.cpp
new file mode 100755
index 0000000..e7e3822
--- /dev/null
+++ b/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)