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CLK/Storage/MassStorage/Formats/HDV.cpp

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//
// HDV.cpp
// Clock Signal
//
// Created by Thomas Harte on 14/11/2022.
// Copyright © 2022 Thomas Harte. All rights reserved.
//
#include "HDV.hpp"
#include <algorithm>
using namespace Storage::MassStorage;
HDV::HDV(const std::string &file_name, long start, long size):
file_(file_name),
file_start_(start),
image_size_(std::min(size, long(file_.stats().st_size)))
{
mapper_.set_drive_type(
Storage::MassStorage::Encodings::Apple::DriveType::SCSI,
size_t(size / 512)
);
}
size_t HDV::get_block_size() {
return 512;
}
size_t HDV::get_number_of_blocks() {
return mapper_.get_number_of_blocks();
}
std::vector<uint8_t> HDV::get_block(size_t address) {
const auto source_address = mapper_.to_source_address(address);
const auto file_offset = offset_for_block(source_address);
if(source_address >= 0) {
file_.seek(file_offset, SEEK_SET);
return mapper_.convert_source_block(source_address, file_.read(get_block_size()));
} else {
return mapper_.convert_source_block(source_address);
}
}
void HDV::set_block(size_t address, const std::vector<uint8_t> &data) {
const auto source_address = mapper_.to_source_address(address);
const auto file_offset = offset_for_block(source_address);
if(source_address >= 0 && file_offset >= 0) {
file_.seek(file_offset, SEEK_SET);
file_.write(data);
}
}
long HDV::offset_for_block(ssize_t address) {
if(address < 0) return -1;
const long offset = 512 * address;
if(offset > image_size_ - 512) return -1;
return file_start_ + offset;
}