mirror of
https://github.com/libretro/scummvm.git
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116 lines
3.3 KiB
C++
116 lines
3.3 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef TEENAGENT_PACK_H
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#define TEENAGENT_PACK_H
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#include "common/file.h"
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#include "common/array.h"
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namespace TeenAgent {
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class Pack {
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protected:
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uint32 _fileCount;
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public:
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Pack(): _fileCount(0) {}
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virtual ~Pack() {}
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virtual bool open(const Common::String &filename) = 0;
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virtual void close() = 0;
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virtual uint32 fileCount() const { return _fileCount; }
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virtual uint32 getSize(uint32 id) const = 0;
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virtual uint32 read(uint32 id, byte *dst, uint32 size) const = 0;
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virtual Common::SeekableReadStream *getStream(uint32 id) const = 0;
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};
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///FilePack keeps opened file and returns substream for each request.
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class FilePack : public Pack {
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mutable Common::File file;
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uint32 *offsets;
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public:
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FilePack();
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~FilePack();
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virtual bool open(const Common::String &filename);
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virtual void close();
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virtual uint32 getSize(uint32 id) const;
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virtual uint32 read(uint32 id, byte *dst, uint32 size) const;
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virtual Common::SeekableReadStream *getStream(uint32 id) const;
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};
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/** Pack file which reopens file each request. Do not keep file descriptor open.
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** Useful for minimizing file descriptors opened at the same time. Critical for PSP backend.
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**/
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class TransientFilePack : public Pack {
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uint32 *offsets;
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Common::String _filename;
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public:
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TransientFilePack();
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~TransientFilePack();
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virtual bool open(const Common::String &filename);
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virtual void close();
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virtual uint32 getSize(uint32 id) const;
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virtual uint32 read(uint32 id, byte *dst, uint32 size) const;
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virtual Common::SeekableReadStream *getStream(uint32 id) const;
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};
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///MemoryPack loads whole pack in memory, currently unused.
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class MemoryPack : public Pack {
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struct Chunk {
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byte *data;
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uint32 size;
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inline Chunk(): data(0), size(0) {}
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inline Chunk(const Chunk &c) : data(c.data), size(c.size) { c.reset(); }
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inline Chunk &operator=(const Chunk &c) {
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data = c.data;
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size = c.size;
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c.reset();
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return *this;
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}
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inline ~Chunk() { delete[] data; }
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inline void reset() const {
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Chunk *c = const_cast<Chunk *>(this);
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c->data = 0;
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c->size = 0;
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}
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};
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Common::Array<Chunk> chunks;
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public:
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virtual bool open(const Common::String &filename);
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virtual void close();
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virtual uint32 getSize(uint32 id) const;
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virtual uint32 read(uint32 id, byte *dst, uint32 size) const;
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virtual Common::SeekableReadStream *getStream(uint32 id) const;
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};
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} // End of namespace TeenAgent
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#endif
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