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143 lines
4.2 KiB
C++
143 lines
4.2 KiB
C++
//
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// Tape.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 29/08/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Tape.hpp"
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#include <deque>
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#include "../../NumberTheory/CRC.hpp"
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#include "../../Storage/Tape/Parsers/Acorn.hpp"
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using namespace StaticAnalyser::Acorn;
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static std::unique_ptr<File::Chunk> GetNextChunk(const std::shared_ptr<Storage::Tape::Tape> &tape, Storage::Tape::Acorn::Parser &parser) {
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std::unique_ptr<File::Chunk> new_chunk(new File::Chunk);
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int shift_register = 0;
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// TODO: move this into the parser
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#define shift() shift_register = (shift_register >> 1) | (parser.get_next_bit(tape) << 9)
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// find next area of high tone
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while(!tape->is_at_end() && (shift_register != 0x3ff)) {
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shift();
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}
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// find next 0x2a (swallowing stop bit)
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while(!tape->is_at_end() && (shift_register != 0x254)) {
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shift();
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}
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#undef shift
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parser.reset_crc();
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parser.reset_error_flag();
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// read out name
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char name[11];
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int name_ptr = 0;
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while(!tape->is_at_end() && name_ptr < sizeof(name)) {
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name[name_ptr] = (char)parser.get_next_byte(tape);
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if(!name[name_ptr]) break;
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name_ptr++;
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}
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name[sizeof(name)-1] = '\0';
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new_chunk->name = name;
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// addresses
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new_chunk->load_address = (uint32_t)parser.get_next_word(tape);
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new_chunk->execution_address = (uint32_t)parser.get_next_word(tape);
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new_chunk->block_number = (uint16_t)parser.get_next_short(tape);
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new_chunk->block_length = (uint16_t)parser.get_next_short(tape);
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new_chunk->block_flag = (uint8_t)parser.get_next_byte(tape);
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new_chunk->next_address = (uint32_t)parser.get_next_word(tape);
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uint16_t calculated_header_crc = parser.get_crc();
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uint16_t stored_header_crc = (uint16_t)parser.get_next_short(tape);
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stored_header_crc = (uint16_t)((stored_header_crc >> 8) | (stored_header_crc << 8));
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new_chunk->header_crc_matched = stored_header_crc == calculated_header_crc;
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parser.reset_crc();
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new_chunk->data.reserve(new_chunk->block_length);
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for(int c = 0; c < new_chunk->block_length; c++) {
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new_chunk->data.push_back((uint8_t)parser.get_next_byte(tape));
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}
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if(new_chunk->block_length && !(new_chunk->block_flag&0x40)) {
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uint16_t calculated_data_crc = parser.get_crc();
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uint16_t stored_data_crc = (uint16_t)parser.get_next_short(tape);
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stored_data_crc = (uint16_t)((stored_data_crc >> 8) | (stored_data_crc << 8));
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new_chunk->data_crc_matched = stored_data_crc == calculated_data_crc;
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} else {
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new_chunk->data_crc_matched = true;
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}
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return parser.get_error_flag() ? nullptr : std::move(new_chunk);
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}
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std::unique_ptr<File> GetNextFile(std::deque<File::Chunk> &chunks) {
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// find next chunk with a block number of 0
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while(chunks.size() && chunks.front().block_number) {
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chunks.pop_front();
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}
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if(!chunks.size()) return nullptr;
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// accumulate chunks for as long as block number is sequential and the end-of-file bit isn't set
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std::unique_ptr<File> file(new File);
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uint16_t block_number = 0;
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while(chunks.size()) {
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if(chunks.front().block_number != block_number) return nullptr;
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bool was_last = chunks.front().block_flag & 0x80;
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file->chunks.push_back(chunks.front());
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chunks.pop_front();
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block_number++;
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if(was_last) break;
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}
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// accumulate total data, copy flags appropriately
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file->name = file->chunks.front().name;
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file->load_address = file->chunks.front().load_address;
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file->execution_address = file->chunks.front().execution_address;
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file->is_protected = !!(file->chunks.back().block_flag & 0x01); // I think the last flags are the ones that count; TODO: check.
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// copy all data into a single big block
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for(File::Chunk chunk : file->chunks) {
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file->data.insert(file->data.end(), chunk.data.begin(), chunk.data.end());
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}
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return file;
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}
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std::list<File> StaticAnalyser::Acorn::GetFiles(const std::shared_ptr<Storage::Tape::Tape> &tape) {
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Storage::Tape::Acorn::Parser parser;
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// populate chunk list
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std::deque<File::Chunk> chunk_list;
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while(!tape->is_at_end()) {
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std::unique_ptr<File::Chunk> chunk = GetNextChunk(tape, parser);
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if(chunk) {
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chunk_list.push_back(*chunk);
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}
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}
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// decompose into file list
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std::list<File> file_list;
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while(chunk_list.size()) {
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std::unique_ptr<File> next_file = GetNextFile(chunk_list);
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if(next_file) {
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file_list.push_back(*next_file);
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}
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}
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return file_list;
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}
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