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123 lines
3.8 KiB
C++
123 lines
3.8 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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#include "common/formats/disk_image.h"
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#include "common/memstream.h"
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#include "common/path.h"
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#include "common/textconsole.h"
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#include "agi/disk_image.h"
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namespace Agi {
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/**
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* DiskImageStream is a stream wrapper around Common::DiskImage.
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*
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* This allows DiskImage to lazily decode tracks as a stream is used.
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* This is important for detection, because the .woz format is noticeably
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* expensive to decode all tracks at once, and detection has to read
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* INITDIR to discover which track to read LOGDIR from.
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*/
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class DiskImageStream : virtual public Common::SeekableReadStream {
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public:
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DiskImageStream(Common::DiskImage *diskImage) : _diskImage(diskImage), _stream(_diskImage->getDiskStream()) {}
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~DiskImageStream() {
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delete _diskImage;
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}
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uint32 read(void *dataPtr, uint32 dataSize) override {
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return _diskImage->read(dataPtr, pos(), dataSize);
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}
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bool eos() const override { return _stream->eos(); }
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void clearErr() override { _stream->clearErr(); }
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int64 pos() const override{ return _stream->pos(); }
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int64 size() const override { return _stream->size(); }
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bool seek(int64 offs, int whence = SEEK_SET) override { return _stream->seek(offs, whence); }
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private:
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Common::DiskImage *_diskImage;
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Common::SeekableReadStream *_stream;
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};
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Common::SeekableReadStream *openPCDiskImage(const Common::Path &path, const Common::FSNode &node) {
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Common::SeekableReadStream *stream = node.createReadStream();
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if (stream == nullptr) {
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warning("unable to open disk image: %s", path.baseName().c_str());
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return nullptr;
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}
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// validate disk size
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if (stream->size() != PC_DISK_SIZE) {
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delete stream;
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return nullptr;
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}
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return stream;
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}
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Common::SeekableReadStream *openA2DiskImage(const Common::Path &path, const Common::FSNode &node, bool loadAllTracks) {
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Common::String name = path.baseName();
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// Open the image with Common::DiskImage, unless the file extension is ".img".
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// DiskImage expects ".img" to be a PC disk image, but it also gets used as
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// an Apple II raw sector disk image, so just open it and and read it.
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Common::SeekableReadStream *stream = nullptr;
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if (name.hasSuffixIgnoreCase(".img")) {
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stream = node.createReadStream();
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} else {
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if (loadAllTracks) {
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// when loading all tracks, open with DiskImage and take the stream.
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Common::DiskImage diskImage;
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if (diskImage.open(node)) {
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stream = diskImage.releaseStream();
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}
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} else {
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// when loading tracks as they're used, create a DiskImage with lazy
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// decoding and wrap it in a stream.
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Common::DiskImage *diskImage = new Common::DiskImage();
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diskImage->setLazyDecoding(true);
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if (diskImage->open(node)) {
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stream = new DiskImageStream(diskImage);
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} else {
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delete diskImage;
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}
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}
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}
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if (stream == nullptr) {
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warning("unable to open disk image: %s", path.baseName().c_str());
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return nullptr;
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}
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// validate disk size
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if (stream->size() != A2_DISK_SIZE) {
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delete stream;
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return nullptr;
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}
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return stream;
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}
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} // End of namespace Agi
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