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-rwxr-xr-xCPP/7zip/Common/MethodProps.cpp99
1 files changed, 99 insertions, 0 deletions
diff --git a/CPP/7zip/Common/MethodProps.cpp b/CPP/7zip/Common/MethodProps.cpp
new file mode 100755
index 0000000..937708e
--- /dev/null
+++ b/CPP/7zip/Common/MethodProps.cpp
@@ -0,0 +1,99 @@
+// MethodProps.cpp
+
+#include "StdAfx.h"
+
+#include "../../Common/MyCom.h"
+
+#include "../ICoder.h"
+
+#include "MethodProps.h"
+
+static const UInt64 k_LZMA = 0x030101;
+static const UInt64 k_LZMA2 = 0x21;
+
+HRESULT SetMethodProperties(const CMethod &method, const UInt64 *inSizeForReduce, IUnknown *coder)
+{
+ bool tryReduce = false;
+ UInt32 reducedDictionarySize = 1 << 10;
+ if (inSizeForReduce != 0 && (method.Id == k_LZMA || method.Id == k_LZMA2))
+ {
+ for (;;)
+ {
+ const UInt32 step = (reducedDictionarySize >> 1);
+ if (reducedDictionarySize >= *inSizeForReduce)
+ {
+ tryReduce = true;
+ break;
+ }
+ reducedDictionarySize += step;
+ if (reducedDictionarySize >= *inSizeForReduce)
+ {
+ tryReduce = true;
+ break;
+ }
+ if (reducedDictionarySize >= ((UInt32)3 << 30))
+ break;
+ reducedDictionarySize += step;
+ }
+ }
+
+ {
+ int numProps = method.Props.Size();
+ CMyComPtr<ICompressSetCoderProperties> setCoderProperties;
+ coder->QueryInterface(IID_ICompressSetCoderProperties, (void **)&setCoderProperties);
+ if (setCoderProperties == NULL)
+ {
+ if (numProps != 0)
+ return E_INVALIDARG;
+ }
+ else
+ {
+ CRecordVector<PROPID> propIDs;
+ NWindows::NCOM::CPropVariant *values = new NWindows::NCOM::CPropVariant[numProps];
+ HRESULT res = S_OK;
+ try
+ {
+ for (int i = 0; i < numProps; i++)
+ {
+ const CProp &prop = method.Props[i];
+ propIDs.Add(prop.Id);
+ NWindows::NCOM::CPropVariant &value = values[i];
+ value = prop.Value;
+ // if (tryReduce && prop.Id == NCoderPropID::kDictionarySize && value.vt == VT_UI4 && reducedDictionarySize < value.ulVal)
+ if (tryReduce)
+ if (prop.Id == NCoderPropID::kDictionarySize)
+ if (value.vt == VT_UI4)
+ if (reducedDictionarySize < value.ulVal)
+ value.ulVal = reducedDictionarySize;
+ }
+ CMyComPtr<ICompressSetCoderProperties> setCoderProperties;
+ coder->QueryInterface(IID_ICompressSetCoderProperties, (void **)&setCoderProperties);
+ res = setCoderProperties->SetCoderProperties(&propIDs.Front(), values, numProps);
+ }
+ catch(...)
+ {
+ delete []values;
+ throw;
+ }
+ delete []values;
+ RINOK(res);
+ }
+ }
+
+ /*
+ CMyComPtr<ICompressWriteCoderProperties> writeCoderProperties;
+ coder->QueryInterface(IID_ICompressWriteCoderProperties, (void **)&writeCoderProperties);
+ if (writeCoderProperties != NULL)
+ {
+ CSequentialOutStreamImp *outStreamSpec = new CSequentialOutStreamImp;
+ CMyComPtr<ISequentialOutStream> outStream(outStreamSpec);
+ outStreamSpec->Init();
+ RINOK(writeCoderProperties->WriteCoderProperties(outStream));
+ size_t size = outStreamSpec->GetSize();
+ filterProps.SetCapacity(size);
+ memmove(filterProps, outStreamSpec->GetBuffer(), size);
+ }
+ */
+ return S_OK;
+}
+