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/**
* @file llmemorystream.h
* @author Phoenix
* @date 2005-06-03
* @brief Implementation of a simple fixed memory stream
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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;
* version 2.1 of the License only.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLMEMORYSTREAM_H
#define LL_LLMEMORYSTREAM_H
/**
* This is a simple but effective optimization when you want to treat
* a chunk of memory as an istream. I wrote this to avoid turing a
* buffer into a string, and then throwing the string into an
* iostringstream just to parse it into another datatype, eg, LLSD.
*/
#include <iostream>
/**
* @class LLMemoryStreamBuf
* @brief This implements a wrapper around a piece of memory for istreams
*
* The memory passed in is NOT owned by an instance. The caller must
* be careful to always pass in a valid memory location that exists
* for at least as long as this streambuf.
*/
class LL_COMMON_API LLMemoryStreamBuf : public std::streambuf
{
public:
LLMemoryStreamBuf(const U8* start, S32 length);
~LLMemoryStreamBuf();
void reset(const U8* start, S32 length);
protected:
int underflow();
//std::streamsize xsgetn(char* dest, std::streamsize n);
};
/**
* @class LLMemoryStream
* @brief This implements a wrapper around a piece of memory for istreams
*
* The memory passed in is NOT owned by an instance. The caller must
* be careful to always pass in a valid memory location that exists
* for at least as long as this streambuf.
*/
class LL_COMMON_API LLMemoryStream : public std::istream
{
public:
LLMemoryStream(const U8* start, S32 length);
~LLMemoryStream();
protected:
LLMemoryStreamBuf mStreamBuf;
};
#endif // LL_LLMEMORYSTREAM_H
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