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core/file_sys: Make RomFSReader an abstract interface

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The original RomFSReader is renamed to DirectRomFSReader that directly reads the RomFS.
This commit is contained in:
zhupengfei 2020-02-07 12:45:54 +08:00
parent 821a35bd2b
commit 83e0cc45f4
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GPG Key ID: DD129E108BD09378
2 changed files with 19 additions and 7 deletions
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2
src/core/file_sys/romfs_reader.cpp
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@ -5,7 +5,7 @@
namespace FileSys { namespace FileSys {
std::size_t RomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) { std::size_t DirectRomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
if (length == 0) if (length == 0)
return 0; // Crypto++ does not like zero size buffer return 0; // Crypto++ does not like zero size buffer
file.Seek(file_offset + offset, SEEK_SET); file.Seek(file_offset + offset, SEEK_SET);

24
src/core/file_sys/romfs_reader.h
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@ -6,23 +6,35 @@
namespace FileSys { namespace FileSys {
/**
* Interface for reading RomFS data.
*/
class RomFSReader { class RomFSReader {
public: public:
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size) virtual std::size_t GetSize() const = 0;
virtual std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer) = 0;
};
/**
* A RomFS reader that directly reads the RomFS file.
*/
class DirectRomFSReader : public RomFSReader {
public:
DirectRomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size)
: is_encrypted(false), file(std::move(file)), file_offset(file_offset), : is_encrypted(false), file(std::move(file)), file_offset(file_offset),
data_size(data_size) {} data_size(data_size) {}
RomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size, DirectRomFSReader(FileUtil::IOFile&& file, std::size_t file_offset, std::size_t data_size,
const std::array<u8, 16>& key, const std::array<u8, 16>& ctr, const std::array<u8, 16>& key, const std::array<u8, 16>& ctr,
std::size_t crypto_offset) std::size_t crypto_offset)
: is_encrypted(true), file(std::move(file)), key(key), ctr(ctr), file_offset(file_offset), : is_encrypted(true), file(std::move(file)), key(key), ctr(ctr), file_offset(file_offset),
crypto_offset(crypto_offset), data_size(data_size) {} crypto_offset(crypto_offset), data_size(data_size) {}
std::size_t GetSize() const { std::size_t GetSize() const override {
return data_size; return data_size;
} }
std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer); std::size_t ReadFile(std::size_t offset, std::size_t length, u8* buffer) override;
private: private:
bool is_encrypted; bool is_encrypted;