Initial import of unrar source code

src/unrar/rawread.cpp

@@ -0,0 +1,126 @@
+#include "rar.hpp"
+
+RawRead::RawRead(File *SrcFile)
+{
+  RawRead::SrcFile=SrcFile;
+  ReadPos=0;
+  DataSize=0;
+#ifndef SHELL_EXT
+  Crypt=NULL;
+#endif
+}
+
+
+void RawRead::Read(size_t Size)
+{
+#if !defined(SHELL_EXT) && !defined(RAR_NOCRYPT)
+  if (Crypt!=NULL)
+  {
+    size_t CurSize=Data.Size();
+    size_t SizeToRead=Size-(CurSize-DataSize);
+    if (SizeToRead>0)
+    {
+      size_t AlignedReadSize=SizeToRead+((~SizeToRead+1)&0xf);
+      Data.Add(AlignedReadSize);
+      size_t ReadSize=SrcFile->Read(&Data[CurSize],AlignedReadSize);
+      Crypt->DecryptBlock(&Data[CurSize],AlignedReadSize);
+      DataSize+=ReadSize==0 ? 0:Size;
+    }
+    else
+      DataSize+=Size;
+  }
+  else
+#endif
+    if (Size!=0)
+    {
+      Data.Add(Size);
+      DataSize+=SrcFile->Read(&Data[DataSize],Size);
+    }
+}
+
+
+void RawRead::Read(byte *SrcData,size_t Size)
+{
+  if (Size!=0)
+  {
+    Data.Add(Size);
+    memcpy(&Data[DataSize],SrcData,Size);
+    DataSize+=Size;
+  }
+}
+
+
+void RawRead::Get(byte &Field)
+{
+  if (ReadPos<DataSize)
+  {
+    Field=Data[ReadPos];
+    ReadPos++;
+  }
+  else
+    Field=0;
+}
+
+
+void RawRead::Get(ushort &Field)
+{
+  if (ReadPos+1<DataSize)
+  {
+    Field=Data[ReadPos]+(Data[ReadPos+1]<<8);
+    ReadPos+=2;
+  }
+  else
+    Field=0;
+}
+
+
+void RawRead::Get(uint &Field)
+{
+  if (ReadPos+3<DataSize)
+  {
+    Field=Data[ReadPos]+(Data[ReadPos+1]<<8)+(Data[ReadPos+2]<<16)+
+          (Data[ReadPos+3]<<24);
+    ReadPos+=4;
+  }
+  else
+    Field=0;
+}
+
+
+void RawRead::Get8(int64 &Field)
+{
+  uint Low,High;
+  Get(Low);
+  Get(High);
+  Field=INT32TO64(High,Low);
+}
+
+
+void RawRead::Get(byte *Field,size_t Size)
+{
+  if (ReadPos+Size-1<DataSize)
+  {
+    memcpy(Field,&Data[ReadPos],Size);
+    ReadPos+=Size;
+  }
+  else
+    memset(Field,0,Size);
+}
+
+
+void RawRead::Get(wchar *Field,size_t Size)
+{
+  if (ReadPos+2*Size-1<DataSize)
+  {
+    RawToWide(&Data[ReadPos],Field,Size);
+    ReadPos+=sizeof(wchar)*Size;
+  }
+  else
+    memset(Field,0,sizeof(wchar)*Size);
+}
+
+
+uint RawRead::GetCRC(bool ProcessedOnly)
+{
+  return(DataSize>2 ? CRC(0xffffffff,&Data[2],(ProcessedOnly ? ReadPos:DataSize)-2):0xffffffff);
+}