3.13

7zip/Compress/Arj/Decoder2.cpp

@@ -0,0 +1,95 @@
+// Arj/Decoder2.cpp
+
+#include "StdAfx.h"
+
+#include "Decoder2.h"
+
+#include "Windows/Defs.h"
+
+namespace NCompress{
+namespace NArj {
+namespace NDecoder2 {
+
+static const UINT32 kHistorySize = 26624;
+static const UINT32 kMatchMaxLen = 256;
+static const UINT32 kMatchMinLen = 3;
+
+CCoder::CCoder()
+{}
+
+STDMETHODIMP CCoder::CodeReal(ISequentialInStream *inStream,
+    ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
+    ICompressProgressInfo *progress)
+{
+  if (outSize == NULL)
+    return E_INVALIDARG;
+
+  if (!m_OutWindowStream.IsCreated())
+  {
+    try { m_OutWindowStream.Create(kHistorySize); }
+    catch(...) { return E_OUTOFMEMORY; }
+  }
+  UINT64 pos = 0;
+  m_OutWindowStream.Init(outStream, false);
+  m_InBitStream.Init(inStream);
+  CCoderReleaser coderReleaser(this);
+
+  while(pos < *outSize)
+  {
+    const UINT32 kStartWidth = 0;
+    const UINT32 kStopWidth = 7;
+    UINT32 power = 1 << kStartWidth;
+    UINT32 width;
+    UINT32 len = 0;
+    for (width = kStartWidth; width < kStopWidth; width++)
+    {
+      if (m_InBitStream.ReadBits(1) == 0)
+        break;
+      len += power;
+      power <<= 1;
+    }
+    if (width != 0)
+      len += m_InBitStream.ReadBits(width);
+    if (len == 0)
+    {
+      m_OutWindowStream.PutOneByte(m_InBitStream.ReadBits(8));
+      pos++;
+      continue;
+    }
+    else
+    {
+      len = len - 1 + kMatchMinLen;
+      const UINT32 kStartWidth = 9;
+      const UINT32 kStopWidth = 13;
+      UINT32 power = 1 << kStartWidth;
+      UINT32 width;
+      UINT32 distance = 0;
+      for (width = kStartWidth; width < kStopWidth; width++)
+      {
+        if (m_InBitStream.ReadBits(1) == 0)
+          break;
+        distance += power;
+        power <<= 1;
+      }
+      if (width != 0)
+        distance += m_InBitStream.ReadBits(width);
+      if (distance >= pos)
+        throw "data error";
+      m_OutWindowStream.CopyBackBlock(distance, len);
+        pos += len;
+    }
+  }
+  return m_OutWindowStream.Flush();
+}
+
+STDMETHODIMP CCoder::Code(ISequentialInStream *inStream,
+    ISequentialOutStream *outStream, const UINT64 *inSize, const UINT64 *outSize,
+    ICompressProgressInfo *progress)
+{
+  try { return CodeReal(inStream, outStream, inSize, outSize, progress);}
+  catch(const CInBufferException &e) { return e.ErrorCode; }
+  catch(const CLZOutWindowException &e) { return e.ErrorCode; }
+  catch(...) { return S_FALSE; }
+}
+
+}}}