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68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef COMMON_CONCATSTREAM_H
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#define COMMON_CONCATSTREAM_H
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#include "common/array.h"
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#include "common/ptr.h"
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#include "common/stream.h"
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namespace Common {
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/*
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* ConcatReadStream provides access to a virtually concatenated stream.
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*
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* Manipulating the parent stream directly /will/ mess up a concatstream.
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*
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* Assumptions:
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* - number of streams is small so iterating through array sized by N is cheap
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* - size of streams doesn't change
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*/
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class ConcatReadStream : public SeekableReadStream {
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private:
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typedef Common::Array<Common::SharedPtr<Common::SeekableReadStream>> ParentStreamArray;
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ParentStreamArray _parentStreams;
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Common::Array<int64> _sizes;
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Common::Array<int64> _startOffsets;
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uint32 _totalSize, _linearPos;
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uint32 _volume, _volumePos;
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bool _err, _eos;
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public:
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ConcatReadStream(ParentStreamArray parentStreams);
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int64 pos() const override { return _linearPos; }
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int64 size() const override { return _totalSize; }
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bool eos() const override { return _eos; }
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bool err() const override { return _err; }
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void clearErr() override {
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_err = false;
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_eos = false;
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}
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bool seek(int64 offset, int whence = SEEK_SET) override;
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uint32 read(void *dataPtr, uint32 dataSize) override;
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bool seekToVolume(int volume, int64 offset);
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};
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}
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#endif // COMMON_CONCATSTREAM_H
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