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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//
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// AcornAnalyser.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 "AcornAnalyser.hpp"
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#include "Tape.hpp"
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using namespace StaticAnalyser::Acorn;
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static std::list<std::shared_ptr<Storage::Cartridge::Cartridge>>
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AcornCartridgesFrom(const std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges)
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{
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std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> acorn_cartridges;
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for(std::shared_ptr<Storage::Cartridge::Cartridge> cartridge : cartridges)
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{
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const std::list<Storage::Cartridge::Cartridge::Segment> &segments = cartridge->get_segments();
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// only one mapped item is allowed
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if(segments.size() != 1) continue;
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// which must be 16 kb in size
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Storage::Cartridge::Cartridge::Segment segment = segments.front();
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if(segment.data.size() != 0x4000) continue;
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// is a copyright string present?
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uint8_t copyright_offset = segment.data[7];
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if(
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segment.data[copyright_offset] != 0x00 ||
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segment.data[copyright_offset+1] != 0x28 ||
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segment.data[copyright_offset+2] != 0x43 ||
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segment.data[copyright_offset+3] != 0x29
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) continue;
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// is the language entry point valid?
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if(!(
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(segment.data[0] == 0x00 && segment.data[1] == 0x00 && segment.data[2] == 0x00) ||
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(segment.data[0] != 0x00 && segment.data[2] >= 0x80 && segment.data[2] < 0xc0)
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)) continue;
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// is the service entry point valid?
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if(!(segment.data[5] >= 0x80 && segment.data[5] < 0xc0)) continue;
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// probability of a random binary blob that isn't an Acorn ROM proceeding to here:
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// 1/(2^32) *
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// ( ((2^24)-1)/(2^24)*(1/4) + 1/(2^24) ) *
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// 1/4
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// = something very improbable — around 1/16th of 1 in 2^32, but not exactly.
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acorn_cartridges.push_back(cartridge);
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}
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return acorn_cartridges;
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}
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void StaticAnalyser::Acorn::AddTargets(
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const std::list<std::shared_ptr<Storage::Disk::Disk>> &disks,
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const std::list<std::shared_ptr<Storage::Tape::Tape>> &tapes,
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const std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges,
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std::list<StaticAnalyser::Target> &destination)
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{
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// strip out inappropriate cartridges
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std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> acornCartridges = AcornCartridgesFrom(cartridges);
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// if there are any tapes, attempt to get data from the first
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if(tapes.size() > 0)
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{
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std::shared_ptr<Storage::Tape::Tape> tape = tapes.front();
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tape->reset();
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GetNextFile(tape);
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}
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}
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