initial checkin

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1083 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/translators/tgatranslator/StreamBuffer.h

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+/*****************************************************************************/
+// StreamBuffer
+// StreamBuffer.h
+//
+// The description goes here.
+//
+//
+// Copyright (c) 2002 OpenBeOS Project
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+// and/or sell copies of the Software, and to permit persons to whom the 
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included 
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+/*****************************************************************************/
+
+#ifndef STREAM_BUFFER_H
+#define STREAM_BUFFER_H
+
+#include <DataIO.h>
+
+#define MIN_BUFFER_SIZE 512
+
+class StreamBuffer {
+public:
+	StreamBuffer(BPositionIO *pstream, size_t nbuffersize);
+	~StreamBuffer();
+	
+	status_t InitCheck();
+		// Determines whether the constructor failed or not
+	
+	ssize_t Read(uint8 *pinto, size_t nbytes);
+		// copy nbytes from the stream into pinto
+	
+private:
+	ssize_t ReadStream();
+		// Load the stream buffer from the stream
+
+	BPositionIO *m_pStream;
+		// stream object this object is buffering
+	uint8 *m_pBuffer;
+		// buffered data from m_pStream
+	size_t m_nBufferSize;
+		// number of bytes of memory allocated for m_pBuffer
+	size_t m_nLen;
+		// number of bytes of actual data in m_pBuffer
+	size_t m_nPos;
+		// current position in the buffer
+};
+
+#endif