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122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
/******************************************************************************
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* Copyright (c) 2014, Hobu Inc.
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Hobu, Inc. or Flaxen Geo Consulting nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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****************************************************************************/
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#pragma once
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#include <streambuf>
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#include <iostream>
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#include <vector>
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namespace lazperf
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{
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/**
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Allow a data buffer to be used at a std::streambuf.
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*/
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class charbuf : public std::streambuf
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{
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public:
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/**
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Construct an empty charbuf.
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*/
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charbuf() : m_bufOffset(0)
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{}
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/**
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Construct a charbuf that wraps a byte vector.
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\param v Byte vector to back streambuf.
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\param bufOffset Offset in vector (ignore bytes before offset).
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*/
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charbuf (std::vector<char>& v, pos_type bufOffset = 0)
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{ initialize(v.data(), v.size(), bufOffset); }
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/**
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Construct a charbuf that wraps a byte buffer.
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\param buf Buffer to back streambuf.
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\param count Size of buffer.
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\param bufOffset Offset in vector (ignore bytes before offset).
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*/
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charbuf(char *buf, size_t count, pos_type bufOffset = 0)
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{ initialize(buf, count, bufOffset); }
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/**
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Set a buffer to back a charbuf.
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\param buf Buffer to back streambuf.
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\param count Size of buffer.
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\param bufOffset Offset in vector (ignore bytes before offset).
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*/
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void initialize(char *buf, size_t count, pos_type bufOffset = 0);
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protected:
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/**
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Seek to a position in the buffer.
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\param pos Position to seek to.
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\param which I/O mode [default: rw]
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\return Current position adjusted for buffer offset.
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*/
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std::ios::pos_type seekpos(std::ios::pos_type pos,
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std::ios_base::openmode which = std::ios_base::in | std::ios_base::out);
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/**
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Seek to a position based on an offset from a position.
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\param off Offset from current position.
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\param dir Offset basis (beg, cur or end)
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\param which I/O mode [default: rw]
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\return Current position adjusted for buffer offset.
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*/
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std::ios::pos_type seekoff(std::ios::off_type off,
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std::ios_base::seekdir dir,
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std::ios_base::openmode which = std::ios_base::in | std::ios_base::out);
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private:
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/**
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Offset that allows one to seek to positions not based on the beginning
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of the backing vector, but to some other reference point.
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*/
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std::ios::pos_type m_bufOffset;
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/**
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For the put pointer, it seems we need the beginning of the buffer
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in order to deal with offsets.
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*/
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char *m_buf;
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};
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} //namespace lazperf
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