23 lines
748 B
C++
23 lines
748 B
C++
#include <algorithm>
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#include <cryptopp/aes.h>
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#include <cryptopp/modes.h>
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#include "core/file_sys/romfs_reader.h"
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namespace FileSys {
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std::size_t DirectRomFSReader::ReadFile(std::size_t offset, std::size_t length, u8* buffer) {
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if (length == 0)
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return 0; // Crypto++ does not like zero size buffer
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file.Seek(file_offset + offset, SEEK_SET);
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std::size_t read_length = std::min(length, data_size - offset);
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read_length = file.ReadBytes(buffer, read_length);
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if (is_encrypted) {
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CryptoPP::CTR_Mode<CryptoPP::AES>::Decryption d(key.data(), key.size(), ctr.data());
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d.Seek(crypto_offset + offset);
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d.ProcessData(buffer, buffer, read_length);
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}
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return read_length;
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}
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} // namespace FileSys
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