1 files changed, 112 insertions, 0 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Compress/DeltaFilter.cpp b/src/libs/7zip/win/CPP/7zip/Compress/DeltaFilter.cpp
new file mode 100644
index 000000000..2e421acf4
--- /dev/null
+++ b/src/libs/7zip/win/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)