Initial community commit

Src/external_dependencies/openmpt-trunk/include/unrar/getbits.cpp

@@ -0,0 +1,52 @@
+#include "rar.hpp"
+
+BitInput::BitInput(bool AllocBuffer)
+{
+  ExternalBuffer=false;
+  if (AllocBuffer)
+  {
+    // getbits32 attempts to read data from InAddr, ... InAddr+3 positions.
+    // So let's allocate 3 additional bytes for situation, when we need to
+    // read only 1 byte from the last position of buffer and avoid a crash
+    // from access to next 3 bytes, which contents we do not need.
+    size_t BufSize=MAX_SIZE+3;
+    InBuf=new byte[BufSize];
+
+    // Ensure that we get predictable results when accessing bytes in area
+    // not filled with read data.
+    memset(InBuf,0,BufSize);
+  }
+  else
+    InBuf=NULL;
+}
+
+
+BitInput::~BitInput()
+{
+  if (!ExternalBuffer)
+    delete[] InBuf;
+}
+
+
+void BitInput::faddbits(uint Bits)
+{
+  // Function wrapped version of inline addbits to save code size.
+  addbits(Bits);
+}
+
+
+uint BitInput::fgetbits()
+{
+  // Function wrapped version of inline getbits to save code size.
+  return getbits();
+}
+
+
+void BitInput::SetExternalBuffer(byte *Buf)
+{
+  if (InBuf!=NULL && !ExternalBuffer)
+    delete[] InBuf;
+  InBuf=Buf;
+  ExternalBuffer=true;
+}
+