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/**
* @file llmemorystream.h
* @author Phoenix
* @date 2005-06-03
* @brief Implementation of a simple fixed memory stream
*
* $LicenseInfo:firstyear=2005&license=viewergpl$
*
* Copyright (c) 2005-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#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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