88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/**
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* @file llmemorystream.h
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* @author Phoenix
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* @date 2005-06-03
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* @brief Implementation of a simple fixed memory stream
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*
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* $LicenseInfo:firstyear=2005&license=viewergpl$
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*
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* Copyright (c) 2005-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_LLMEMORYSTREAM_H
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#define LL_LLMEMORYSTREAM_H
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/**
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* This is a simple but effective optimization when you want to treat
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* a chunk of memory as an istream. I wrote this to avoid turing a
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* buffer into a string, and then throwing the string into an
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* iostringstream just to parse it into another datatype, eg, LLSD.
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*/
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#include <iostream>
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/**
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* @class LLMemoryStreamBuf
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* @brief This implements a wrapper around a piece of memory for istreams
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*
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* The memory passed in is NOT owned by an instance. The caller must
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* be careful to always pass in a valid memory location that exists
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* for at least as long as this streambuf.
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*/
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class LL_COMMON_API LLMemoryStreamBuf : public std::streambuf
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{
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public:
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LLMemoryStreamBuf(const U8* start, S32 length);
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~LLMemoryStreamBuf();
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void reset(const U8* start, S32 length);
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protected:
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int underflow();
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//std::streamsize xsgetn(char* dest, std::streamsize n);
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};
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/**
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* @class LLMemoryStream
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* @brief This implements a wrapper around a piece of memory for istreams
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*
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* The memory passed in is NOT owned by an instance. The caller must
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* be careful to always pass in a valid memory location that exists
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* for at least as long as this streambuf.
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*/
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class LL_COMMON_API LLMemoryStream : public std::istream
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{
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public:
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LLMemoryStream(const U8* start, S32 length);
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~LLMemoryStream();
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protected:
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LLMemoryStreamBuf mStreamBuf;
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};
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#endif // LL_LLMEMORYSTREAM_H
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