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112 lines
4.5 KiB
C++
112 lines
4.5 KiB
C++
//
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// Disk.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Disk.hpp"
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#include "../../Storage/Disk/DiskController.hpp"
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#include "../../Storage/Disk/Encodings/MFM.hpp"
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#include "../../NumberTheory/CRC.hpp"
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#include <algorithm>
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using namespace StaticAnalyser::Acorn;
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std::unique_ptr<Catalogue> StaticAnalyser::Acorn::GetDFSCatalogue(const std::shared_ptr<Storage::Disk::Disk> &disk)
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{
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// c.f. http://beebwiki.mdfs.net/Acorn_DFS_disc_format
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std::unique_ptr<Catalogue> catalogue(new Catalogue);
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Storage::Encodings::MFM::Parser parser(false, disk);
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std::shared_ptr<Storage::Encodings::MFM::Sector> names = parser.get_sector(0, 0);
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std::shared_ptr<Storage::Encodings::MFM::Sector> details = parser.get_sector(0, 1);
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if(!names || !details) return nullptr;
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if(names->data.size() != 256 || details->data.size() != 256) return nullptr;
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uint8_t final_file_offset = details->data[5];
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if(final_file_offset&7) return nullptr;
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if(final_file_offset < 8) return nullptr;
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char disk_name[13];
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snprintf(disk_name, 13, "%.8s%.4s", &names->data[0], &details->data[0]);
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catalogue->name = disk_name;
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switch((details->data[6] >> 4)&3)
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{
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case 0: catalogue->bootOption = Catalogue::BootOption::None; break;
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case 1: catalogue->bootOption = Catalogue::BootOption::LoadBOOT; break;
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case 2: catalogue->bootOption = Catalogue::BootOption::RunBOOT; break;
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case 3: catalogue->bootOption = Catalogue::BootOption::ExecBOOT; break;
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}
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// DFS files are stored contiguously, and listed in descending order of distance from track 0.
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// So iterating backwards implies the least amount of seeking.
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for(size_t file_offset = final_file_offset - 8; file_offset > 0; file_offset -= 8)
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{
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File new_file;
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char name[10];
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snprintf(name, 10, "%c.%.7s", names->data[file_offset + 7] & 0x7f, &names->data[file_offset]);
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new_file.name = name;
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new_file.load_address = (uint32_t)(details->data[file_offset] | (details->data[file_offset+1] << 8) | ((details->data[file_offset+6]&0x0c) << 14));
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new_file.execution_address = (uint32_t)(details->data[file_offset+2] | (details->data[file_offset+3] << 8) | ((details->data[file_offset+6]&0xc0) << 10));
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new_file.is_protected = !!(names->data[file_offset + 7] & 0x80);
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long data_length = (long)(details->data[file_offset+4] | (details->data[file_offset+5] << 8) | ((details->data[file_offset+6]&0x30) << 12));
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int start_sector = details->data[file_offset+7] | ((details->data[file_offset+6]&0x03) << 8);
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new_file.data.reserve((size_t)data_length);
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if(start_sector < 2) continue;
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while(data_length > 0)
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{
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uint8_t sector = (uint8_t)(start_sector % 10);
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uint8_t track = (uint8_t)(start_sector / 10);
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start_sector++;
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std::shared_ptr<Storage::Encodings::MFM::Sector> next_sector = parser.get_sector(track, sector);
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if(!next_sector) break;
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long length_from_sector = std::min(data_length, 256l);
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new_file.data.insert(new_file.data.end(), next_sector->data.begin(), next_sector->data.begin() + length_from_sector);
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data_length -= length_from_sector;
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}
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if(!data_length) catalogue->files.push_front(new_file);
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}
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return catalogue;
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}
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std::unique_ptr<Catalogue> StaticAnalyser::Acorn::GetADFSCatalogue(const std::shared_ptr<Storage::Disk::Disk> &disk)
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{
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std::unique_ptr<Catalogue> catalogue(new Catalogue);
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Storage::Encodings::MFM::Parser parser(true, disk);
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std::shared_ptr<Storage::Encodings::MFM::Sector> free_space_map_second_half = parser.get_sector(0, 1);
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if(!free_space_map_second_half) return nullptr;
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std::vector<uint8_t> root_directory;
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root_directory.reserve(5 * 256);
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for(uint8_t c = 2; c < 7; c++)
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{
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std::shared_ptr<Storage::Encodings::MFM::Sector> sector = parser.get_sector(0, c);
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if(!sector) return nullptr;
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root_directory.insert(root_directory.end(), sector->data.begin(), sector->data.end());
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}
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// Quick sanity checks.
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if(root_directory[0x4cb]) return nullptr;
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if(root_directory[1] != 'H' || root_directory[2] != 'u' || root_directory[3] != 'g' || root_directory[4] != 'o') return nullptr;
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if(root_directory[0x4FB] != 'H' || root_directory[0x4FC] != 'u' || root_directory[0x4FD] != 'g' || root_directory[0x4FE] != 'o') return nullptr;
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switch(free_space_map_second_half->data[0xfd])
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{
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default: catalogue->bootOption = Catalogue::BootOption::None; break;
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case 1: catalogue->bootOption = Catalogue::BootOption::LoadBOOT; break;
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case 2: catalogue->bootOption = Catalogue::BootOption::RunBOOT; break;
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case 3: catalogue->bootOption = Catalogue::BootOption::ExecBOOT; break;
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}
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return catalogue;
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}
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