mirror of
https://github.com/libretro/ppsspp.git
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143 lines
3.3 KiB
C++
143 lines
3.3 KiB
C++
// Copyright (c) 2012- PPSSPP Project.
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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, version 2.0 or later versions.
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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 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#pragma once
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// Abstractions around read-only blockdevices, such as PSP UMD discs.
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// CISOFileBlockDevice implements compressed iso images, CISO format.
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//
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// The ISOFileSystemReader reads from a BlockDevice, so it automatically works
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// with CISO images.
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#include "Common/CommonTypes.h"
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#include "Core/ELF/PBPReader.h"
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class FileLoader;
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class BlockDevice
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{
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public:
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virtual ~BlockDevice() {}
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virtual bool ReadBlock(int blockNumber, u8 *outPtr) = 0;
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virtual bool ReadBlocks(u32 minBlock, int count, u8 *outPtr) {
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for (int b = 0; b < count; ++b) {
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if (!ReadBlock(minBlock + b, outPtr)) {
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return false;
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}
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outPtr += GetBlockSize();
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}
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return true;
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}
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int GetBlockSize() const { return 2048;} // forced, it cannot be changed by subclasses
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virtual u32 GetNumBlocks() = 0;
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};
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class CISOFileBlockDevice : public BlockDevice
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{
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public:
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CISOFileBlockDevice(FileLoader *fileLoader);
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~CISOFileBlockDevice();
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bool ReadBlock(int blockNumber, u8 *outPtr) override;
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bool ReadBlocks(u32 minBlock, int count, u8 *outPtr) override;
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u32 GetNumBlocks() override { return numBlocks; }
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private:
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FileLoader *fileLoader_;
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u32 *index;
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u8 *readBuffer;
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u8 *zlibBuffer;
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u32 zlibBufferFrame;
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u8 indexShift;
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u8 blockShift;
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u32 frameSize;
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u32 numBlocks;
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u32 numFrames;
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};
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class FileBlockDevice : public BlockDevice
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{
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public:
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FileBlockDevice(FileLoader *fileLoader);
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~FileBlockDevice();
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bool ReadBlock(int blockNumber, u8 *outPtr) override;
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bool ReadBlocks(u32 minBlock, int count, u8 *outPtr) override;
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u32 GetNumBlocks() override {return (u32)(filesize_ / GetBlockSize());}
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private:
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FileLoader *fileLoader_;
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u64 filesize_;
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};
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// For encrypted ISOs in PBP files.
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struct table_info {
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u8 mac[16];
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u32 offset;
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int size;
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int flag;
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int unk_1c;
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};
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class NPDRMDemoBlockDevice : public BlockDevice
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{
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public:
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NPDRMDemoBlockDevice(FileLoader *fileLoader);
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~NPDRMDemoBlockDevice();
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bool ReadBlock(int blockNumber, u8 *outPtr) override;
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u32 GetNumBlocks() override {return (u32)lbaSize;}
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private:
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FileLoader *fileLoader_;
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u32 lbaSize;
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u32 psarOffset;
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int blockSize;
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int blockLBAs;
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u32 numBlocks;
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u8 vkey[16];
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u8 hkey[16];
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struct table_info *table;
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int currentBlock;
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u8 *blockBuf;
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u8 *tempBuf;
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};
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// This simply fully reads another block device and caches it in RAM.
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// A bit slow to initialize.
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class RAMBlockDevice : public BlockDevice
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{
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public:
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RAMBlockDevice(BlockDevice *device);
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~RAMBlockDevice();
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bool ReadBlock(int blockNumber, u8 *outPtr) override;
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u32 GetNumBlocks() override;
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private:
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int totalBlocks_;
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u8 *image_;
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};
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BlockDevice *constructBlockDevice(FileLoader *fileLoader);
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