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122 lines
3.7 KiB
C++
122 lines
3.7 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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#include "charbuf.hpp"
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namespace lazperf
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{
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void charbuf::initialize(char *buf, size_t count, std::ios::pos_type bufOffset)
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{
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m_bufOffset = bufOffset;
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m_buf = buf;
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setg(buf, buf, buf + count);
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setp(buf, buf + count);
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}
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std::ios::pos_type charbuf::seekpos(std::ios::pos_type pos,
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std::ios_base::openmode which)
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{
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pos -= m_bufOffset;
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if (which & std::ios_base::in)
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{
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if (pos >= egptr() - eback())
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return -1;
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char *cpos = eback() + pos;
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setg(eback(), cpos, egptr());
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}
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if (which & std::ios_base::out)
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{
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if (pos > epptr() - m_buf)
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return -1;
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char *cpos = m_buf + pos;
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setp(cpos, epptr());
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}
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return pos;
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}
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std::ios::pos_type
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charbuf::seekoff(std::ios::off_type off, std::ios_base::seekdir dir,
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std::ios_base::openmode which)
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{
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std::ios::pos_type pos;
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char *cpos = nullptr;
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if (which & std::ios_base::in)
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{
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switch (dir)
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{
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case std::ios::beg:
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cpos = eback() + off - m_bufOffset;
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break;
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case std::ios::cur:
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cpos = gptr() + off;
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break;
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case std::ios::end:
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cpos = egptr() - off;
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break;
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default:
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break; // Should never happen.
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}
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if (cpos < eback() || cpos > egptr())
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return -1;
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setg(eback(), cpos, egptr());
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pos = cpos - eback();
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}
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if (which & std::ios_base::out)
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{
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switch (dir)
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{
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case std::ios::beg:
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cpos = m_buf + off - m_bufOffset;
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break;
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case std::ios::cur:
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cpos = pptr() + off;
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break;
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case std::ios::end:
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cpos = egptr() - off;
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break;
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default:
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break; // Should never happen.
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}
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if (cpos < m_buf || cpos > epptr())
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return -1;
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setp(cpos, epptr());
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pos = cpos - m_buf;
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}
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return pos;
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}
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} //namespace lazperf
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