JMA Support.

zsnes/src/jma/inbyte.cpp

@@ -0,0 +1,60 @@
+/*
+Copyright (C) 2002 Andrea Mazzoleni ( http://advancemame.sf.net )
+Copyright (C) 2001-4 Igor Pavlov ( http://www.7-zip.org )
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include "inbyte.h"
+
+namespace NStream{
+
+CInByte::CInByte(UINT32 aBufferSize):
+  m_BufferSize(aBufferSize),
+  m_BufferBase(0)
+{
+  m_BufferBase = new BYTE[m_BufferSize];
+}
+
+CInByte::~CInByte()
+{
+  delete []m_BufferBase;
+}
+
+void CInByte::Init(ISequentialInStream *aStream)
+{
+  m_Stream = aStream;
+  m_ProcessedSize = 0;
+  m_Buffer = m_BufferBase;
+  m_BufferLimit = m_Buffer;
+  m_StreamWasExhausted = false;
+}
+
+bool CInByte::ReadBlock()
+{
+  if (m_StreamWasExhausted)
+    return false;
+  m_ProcessedSize += (m_Buffer - m_BufferBase);
+  UINT32 aNumProcessedBytes;
+  HRESULT aResult = m_Stream->Read(m_BufferBase, m_BufferSize, &aNumProcessedBytes);
+  if (aResult != S_OK)
+    throw aResult;
+  m_Buffer = m_BufferBase;
+  m_BufferLimit = m_Buffer + aNumProcessedBytes;
+  m_StreamWasExhausted = (aNumProcessedBytes == 0);
+  return (!m_StreamWasExhausted);
+}
+
+}