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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
//==============================================================================
/** Wraps another input stream, and reads from a specific part of it.
This lets you take a subsection of a stream and present it as an entire
stream in its own right.
@tags{Core}
*/
class JUCE_API SubregionStream : public InputStream
{
public:
//==============================================================================
/** Creates a SubregionStream from an input source.
@param sourceStream the source stream to read from
@param startPositionInSourceStream this is the position in the source stream that
corresponds to position 0 in this stream
@param lengthOfSourceStream this specifies the maximum number of bytes
from the source stream that will be passed through
by this stream. When the position of this stream
exceeds lengthOfSourceStream, it will cause an end-of-stream.
If the length passed in here is greater than the length
of the source stream (as returned by getTotalLength()),
then the smaller value will be used.
Passing a negative value for this parameter means it
will keep reading until the source's end-of-stream.
@param deleteSourceWhenDestroyed whether the sourceStream that is passed in should be
deleted by this object when it is itself deleted.
*/
SubregionStream (InputStream* sourceStream,
int64 startPositionInSourceStream,
int64 lengthOfSourceStream,
bool deleteSourceWhenDestroyed);
/** Destructor.
This may also delete the source stream, if that option was chosen when the
buffered stream was created.
*/
~SubregionStream() override;
//==============================================================================
int64 getTotalLength() override;
int64 getPosition() override;
bool setPosition (int64 newPosition) override;
int read (void* destBuffer, int maxBytesToRead) override;
bool isExhausted() override;
private:
//==============================================================================
OptionalScopedPointer<InputStream> source;
const int64 startPositionInSourceStream, lengthOfSourceStream;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SubregionStream)
};
} // namespace juce
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