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78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
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Portions of this file are from JUCE.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Please visit http://www.juce.com
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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SubregionStream::SubregionStream (InputStream* const sourceStream,
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const int64 start, const int64 length,
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const bool deleteSourceWhenDestroyed)
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: source (sourceStream, deleteSourceWhenDestroyed),
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startPositionInSourceStream (start),
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lengthOfSourceStream (length)
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{
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SubregionStream::setPosition (0);
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}
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SubregionStream::~SubregionStream()
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{
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}
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int64 SubregionStream::getTotalLength()
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{
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const int64 srcLen = source->getTotalLength() - startPositionInSourceStream;
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return lengthOfSourceStream >= 0 ? bmin (lengthOfSourceStream, srcLen)
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: srcLen;
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}
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int64 SubregionStream::getPosition()
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{
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return source->getPosition() - startPositionInSourceStream;
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}
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bool SubregionStream::setPosition (int64 newPosition)
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{
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return source->setPosition (bmax ((int64) 0, newPosition + startPositionInSourceStream));
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}
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int SubregionStream::read (void* destBuffer, int maxBytesToRead)
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{
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bassert (destBuffer != nullptr && maxBytesToRead >= 0);
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if (lengthOfSourceStream < 0)
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return source->read (destBuffer, maxBytesToRead);
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maxBytesToRead = (int) bmin ((int64) maxBytesToRead, lengthOfSourceStream - getPosition());
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if (maxBytesToRead <= 0)
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return 0;
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return source->read (destBuffer, maxBytesToRead);
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}
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bool SubregionStream::isExhausted()
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{
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if (lengthOfSourceStream >= 0 && getPosition() >= lengthOfSourceStream)
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return true;
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return source->isExhausted();
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}
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