135 lines
3.2 KiB
C++
135 lines
3.2 KiB
C++
/**
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* @file llbufferstream.h
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* @author Phoenix
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* @date 2005-10-10
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* @brief Classes to treat an LLBufferArray as a c++ iostream.
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*
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* Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
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* $License$
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*/
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#ifndef LL_LLBUFFERSTREAM_H
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#define LL_LLBUFFERSTREAM_H
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#include <iosfwd>
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#include <iostream>
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#include "llbuffer.h"
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/**
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* @class LLBufferStreamBuf
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* @brief This implements the buffer wrapper for an istream
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*
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* The buffer array passed in is not owned by the stream buf object.
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*/
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class LLBufferStreamBuf : public std::streambuf
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{
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public:
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LLBufferStreamBuf(
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const LLChannelDescriptors& channels,
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LLBufferArray* buffer);
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virtual ~LLBufferStreamBuf();
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protected:
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#if( LL_WINDOWS || __GNUC__ > 2 )
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typedef std::streambuf::pos_type pos_type;
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typedef std::streambuf::off_type off_type;
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#endif
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/* @name streambuf vrtual implementations
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*/
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//@{
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/*
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* @brief called when we hit the end of input
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*
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* @return Returns the character at the current position or EOF.
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*/
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virtual int underflow();
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/*
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* @brief called when we hit the end of output
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*
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* @param c The character to store at the current put position
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* @return Returns EOF if the function failed. Any other value on success.
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*/
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virtual int overflow(int c);
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/*
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* @brief synchronize the buffer
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*
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* @return Returns 0 on success or -1 on failure.
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*/
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virtual int sync();
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/*
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* @brief Seek to an offset position in a stream.
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*
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* @param off Offset value relative to way paramter
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* @param way The seek direction. One of ios::beg, ios::cur, and ios::end.
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* @param which Which pointer to modify. One of ios::in, ios::out,
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* or both masked together.
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* @return Returns the new position or an invalid position on failure.
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*/
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#if( LL_WINDOWS || __GNUC__ > 2)
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virtual pos_type seekoff(
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off_type off,
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std::ios::seekdir way,
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std::ios::openmode which);
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#else
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virtual streampos seekoff(
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streamoff off,
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std::ios::seekdir way,
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std::ios::openmode which);
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#endif
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/*
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* @brief Get s sequence of characters from the input
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*
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* @param dst Pointer to a block of memory to accept the characters
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* @param length Number of characters to be read
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* @return Returns the number of characters read
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*/
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//virtual streamsize xsgetn(char* dst, streamsize length);
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/*
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* @brief Write some characters to output
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*
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* @param src Pointer to a sequence of characters to be output
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* @param length Number of characters to be put
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* @return Returns the number of characters written
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*/
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//virtual streamsize xsputn(char* src, streamsize length);
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//@}
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protected:
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// This channels we are working on.
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LLChannelDescriptors mChannels;
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// The buffer we work on
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LLBufferArray* mBuffer;
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};
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/**
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* @class LLBufferStream
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* @brief This implements an istream based wrapper around an LLBufferArray.
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*
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* This class does not own the buffer array, and does not hold a
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* shared pointer to it. Since the class itself is fairly ligthweight,
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* just make one on the stack when needed and let it fall out of
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* scope.
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*/
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class LLBufferStream : public std::iostream
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{
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public:
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LLBufferStream(
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const LLChannelDescriptors& channels,
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LLBufferArray* buffer);
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~LLBufferStream();
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protected:
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LLBufferStreamBuf mStreamBuf;
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};
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#endif // LL_LLBUFFERSTREAM_H
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