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#pragma once
#include <cstdint>
#include <filesystem>
#include <fstream>
#include <memory>
#include <mutex>
#include <vector>
namespace GC {
class IBlockReader {
public:
virtual ~IBlockReader() = default;
virtual void Read(uint64_t offset, void* dst, size_t size) = 0;
virtual uint64_t Size() const = 0;
std::vector<uint8_t> Read(uint64_t offset, size_t size) {
std::vector<uint8_t> out(size);
Read(offset, out.data(), size);
return out;
}
};
class RawImageReader : public IBlockReader {
public:
explicit RawImageReader(const std::filesystem::path& path);
void Read(uint64_t offset, void* dst, size_t size) override;
uint64_t Size() const override { return mSize; }
private:
std::ifstream mFile;
uint64_t mSize;
std::mutex mMutex;
};
class MemoryBlockReader : public IBlockReader {
public:
explicit MemoryBlockReader(std::vector<uint8_t> data) : mData(std::move(data)) {}
void Read(uint64_t offset, void* dst, size_t size) override;
uint64_t Size() const override { return mData.size(); }
private:
std::vector<uint8_t> mData;
};
class CisoReader : public IBlockReader {
public:
explicit CisoReader(std::shared_ptr<IBlockReader> base);
void Read(uint64_t offset, void* dst, size_t size) override;
uint64_t Size() const override { return mSize; }
static bool Probe(IBlockReader& base);
private:
std::shared_ptr<IBlockReader> mBase;
uint32_t mBlockSize;
uint64_t mSize;
std::vector<int64_t> mBlockOffsets;
};
class GczReader : public IBlockReader {
public:
explicit GczReader(std::shared_ptr<IBlockReader> base);
void Read(uint64_t offset, void* dst, size_t size) override;
uint64_t Size() const override { return mDataSize; }
static bool Probe(IBlockReader& base);
private:
void LoadBlock(uint32_t index);
std::shared_ptr<IBlockReader> mBase;
uint64_t mDataSize;
uint32_t mBlockSize;
uint64_t mDataStart;
uint64_t mCompressedSize;
std::vector<uint64_t> mBlockPointers;
std::vector<uint8_t> mCache;
int64_t mCachedBlock = -1;
std::mutex mMutex;
};
std::shared_ptr<IBlockReader> OpenDiscImage(const std::filesystem::path& path);
std::shared_ptr<IBlockReader> WrapDiscImage(std::shared_ptr<IBlockReader> base);
uint32_t ReadBE32(const uint8_t* p);
uint16_t ReadBE16(const uint8_t* p);
void WriteBE32(uint8_t* p, uint32_t v);
void WriteBE16(uint8_t* p, uint16_t v);
} // namespace GC
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