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92c7695981
Most streams are backed by a memory buffer. Create common base classes for this functionality to avoid code duplication.
73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright 2020 Pierre Ossman for Cendio AB
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <rdr/BufferedInStream.h>
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#include <rdr/Exception.h>
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using namespace rdr;
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static const size_t DEFAULT_BUF_SIZE = 8192;
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BufferedInStream::BufferedInStream(size_t bufSize_)
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: bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
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{
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ptr = end = start = new U8[bufSize];
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}
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BufferedInStream::~BufferedInStream()
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{
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delete [] start;
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}
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size_t BufferedInStream::pos()
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{
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return offset + ptr - start;
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}
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size_t BufferedInStream::overrun(size_t itemSize, size_t nItems, bool wait)
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{
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if (itemSize > bufSize)
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throw Exception("BufferedInStream overrun: "
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"requested size of %lu bytes exceeds maximum of %lu bytes",
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(long unsigned)itemSize, (long unsigned)bufSize);
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if (end - ptr != 0)
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memmove(start, ptr, end - ptr);
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offset += ptr - start;
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end -= ptr - start;
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ptr = start;
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while (avail() < itemSize) {
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if (!fillBuffer(start + bufSize - end, wait))
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return 0;
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}
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size_t nAvail;
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nAvail = avail() / itemSize;
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if (nAvail < nItems)
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return nAvail;
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return nItems;
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}
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