82 lines
2.4 KiB
C++
82 lines
2.4 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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* $LicenseInfo:firstyear=2005&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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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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