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53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
//
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// ZX8081.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 08/06/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#include "ZX8081.hpp"
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using namespace Storage::Data::ZX8081;
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static uint16_t short_at(size_t address, const std::vector<uint8_t> &data) {
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return (uint16_t)(data[address] | (data[address + 1] << 8));
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}
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static std::shared_ptr<File> ZX80FileFromData(const std::vector<uint8_t> &data) {
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// Does this look like a ZX80 file?
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if(data.size() < 0x28) return nullptr;
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// uint16_t next_line_number = short_at(0x2, data);
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// uint16_t first_visible_line = short_at(0x13, data);
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uint16_t vars = short_at(0x8, data);
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uint16_t end_of_file = short_at(0xa, data);
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uint16_t display_address = short_at(0xc, data);
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// check that the end of file is contained within the supplied data
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if(end_of_file - 0x4000 > data.size()) return nullptr;
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// check for the proper ordering of buffers
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if(vars > end_of_file) return nullptr;
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if(end_of_file > display_address) return nullptr;
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// TODO: does it make sense to inspect the tokenised BASIC?
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// It starts at 0x4028 and proceeds as [16-bit line number] [tokens] [0x76],
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// but I'm as yet unable to find documentation of the tokens.
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// TODO: check that the line numbers declared above exist (?)
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std::shared_ptr<File> file(new File);
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file->data = data;
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file->isZX81 = false;
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return file;
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}
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std::shared_ptr<File> Storage::Data::ZX8081::FileFromData(const std::vector<uint8_t> &data) {
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std::shared_ptr<Storage::Data::ZX8081::File> result = ZX80FileFromData(data);
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return result;
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}
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