4.44 beta

CPP/7zip/Compress/Lzx/Lzx86Converter.cpp

@@ -0,0 +1,90 @@
+// Lzx86Converter.cpp
+
+#include "StdAfx.h"
+
+#include "Common/Defs.h"
+
+#include "Lzx86Converter.h"
+
+namespace NCompress {
+namespace NLzx {
+
+static const int kResidue = 6 + 4;
+
+void Cx86ConvertOutStream::MakeTranslation()
+{
+  if (m_Pos <= kResidue)
+    return;
+  UInt32 numBytes = m_Pos - kResidue;
+  Byte *buffer = m_Buffer;
+  for (UInt32 i = 0; i < numBytes;)
+  {
+    if (buffer[i++] == 0xE8)
+    {
+      Int32 absValue = 0;
+      int j;
+      for(j = 0; j < 4; j++)
+        absValue += (UInt32)buffer[i + j] << (j * 8);
+      Int32 pos = (Int32)(m_ProcessedSize + i - 1);
+      if (absValue >= -pos && absValue < (Int32)m_TranslationSize)
+      {
+        UInt32 offset = (absValue >= 0) ? 
+            absValue - pos :
+            absValue + m_TranslationSize;
+        for(j = 0; j < 4; j++)
+        {
+          buffer[i + j] = (Byte)(offset & 0xFF);
+          offset >>= 8;
+        }
+      }
+      i += 4;
+    }
+  }
+}
+
+STDMETHODIMP Cx86ConvertOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
+{
+  if (processedSize != NULL)
+    *processedSize = 0;
+  if (!m_TranslationMode)
+    return m_Stream->Write(data, size, processedSize);
+  UInt32 realProcessedSize = 0;
+  while (realProcessedSize < size)
+  {
+    UInt32 writeSize = MyMin(size - realProcessedSize, kUncompressedBlockSize - m_Pos);
+    memmove(m_Buffer + m_Pos, (const Byte *)data + realProcessedSize, writeSize);
+    m_Pos += writeSize;
+    realProcessedSize += writeSize;
+    if (m_Pos == kUncompressedBlockSize)
+    {
+      RINOK(Flush());
+    }
+  }
+  if (processedSize != NULL)
+    *processedSize = realProcessedSize;
+  return S_OK;
+}
+
+HRESULT Cx86ConvertOutStream::Flush()
+{
+  if (m_Pos == 0)
+    return S_OK;
+  if (m_TranslationMode)
+    MakeTranslation();
+  UInt32 pos = 0;
+  do
+  {
+    UInt32 processed;
+    RINOK(m_Stream->Write(m_Buffer + pos, m_Pos - pos, &processed));
+    if (processed == 0)
+      return E_FAIL;
+    pos += processed;
+  }
+  while(pos < m_Pos);
+  m_ProcessedSize += m_Pos;
+  m_Pos = 0;
+  m_TranslationMode = (m_TranslationMode && (m_ProcessedSize < (1 << 30)));
+  return S_OK;
+}
+
+}}