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60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
//
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// HFV.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 25/08/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#include "HFV.hpp"
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using namespace Storage::MassStorage;
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HFV::HFV(const std::string &file_name) : file_(file_name) {
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// Is the file a multiple of 512 bytes in size and larger than a floppy disk?
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const auto file_size = file_.stats().st_size;
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if(file_size & 511 || file_size <= 800*1024) throw std::exception();
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// Is this an HFS volume?
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// TODO: check filing system for MFS or HFS+.
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const auto prefix = file_.read(2);
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if(prefix[0] != 'L' || prefix[1] != 'K') throw std::exception();
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}
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size_t HFV::get_block_size() {
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return 512;
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}
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size_t HFV::get_number_of_blocks() {
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return mapper_.get_number_of_blocks();
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}
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std::vector<uint8_t> HFV::get_block(size_t address) {
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const auto written = writes_.find(address);
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if(written != writes_.end()) return written->second;
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const auto source_address = mapper_.to_source_address(address);
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if(source_address >= 0 && size_t(source_address)*get_block_size() < size_t(file_.stats().st_size)) {
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const long file_offset = long(get_block_size()) * long(source_address);
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file_.seek(file_offset, SEEK_SET);
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return mapper_.convert_source_block(source_address, file_.read(get_block_size()));
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} else {
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return mapper_.convert_source_block(source_address);
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}
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}
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void HFV::set_block(size_t address, const std::vector<uint8_t> &contents) {
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const auto source_address = mapper_.to_source_address(address);
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if(source_address >= 0 && size_t(source_address)*get_block_size() < size_t(file_.stats().st_size)) {
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const long file_offset = long(get_block_size()) * long(source_address);
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file_.seek(file_offset, SEEK_SET);
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file_.write(contents);
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} else {
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writes_[address] = contents;
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}
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}
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void HFV::set_drive_type(Encodings::Macintosh::DriveType drive_type) {
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mapper_.set_drive_type(drive_type, size_t(file_.stats().st_size) / get_block_size());
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}
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