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94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//
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// AppleGCR.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 21/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include <cstdint>
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#include "../../../Disk/Track/PCMSegment.hpp"
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namespace Storage::Encodings::AppleGCR {
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/// Describes the standard three-byte prologue that begins a header on both the Macintosh and the Apple II from DOS 3.3.
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constexpr uint8_t header_prologue[3] = {0xd5, 0xaa, 0x96};
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/// Describes the standard three-byte prologue that begins a data section.
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constexpr uint8_t data_prologue[3] = {0xd5, 0xaa, 0xad};
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/// Describes the epilogue that ends both data sections and headers.
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constexpr uint8_t epilogue[3] = {0xde, 0xaa, 0xeb};
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/// Describes the standard three-byte prologue used by DOS 3.2 and earlier.
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constexpr uint8_t five_and_three_header_prologue[3] = {0xd5, 0xaa, 0xb5};
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namespace AppleII {
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/*!
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Produces the data section of an Apple II-style six-and-two format sector;
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the segment returned will be 2,792 bits long, encoding the first 256 bytes
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from @c source.
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*/
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Storage::Disk::PCMSegment six_and_two_data(const uint8_t *source);
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/*!
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Produces the Apple II-standard four-and-four per-sector header. This is the same
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for both the 13- and 16-sector formats, and is 112 bits long.
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*/
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Storage::Disk::PCMSegment header(uint8_t volume, uint8_t track, uint8_t sector);
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}
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namespace Macintosh {
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struct SectorSpan {
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int start, length;
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};
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/*!
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@returns the span of sectors included on track @c track using the Macintosh's
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ordinary CLV variable-speed mechanish. Guaranteed to be 12 or fewer.
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*/
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SectorSpan sectors_in_track(int track);
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/*!
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Produces the data section of a Macintosh-format sector;
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the segment returned will be 5680 bits long, encoding the first 524 bytes
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from @c source and including a record of the @c sector.
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*/
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Storage::Disk::PCMSegment data(uint8_t sector, const uint8_t *source);
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/*!
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Produces the Mac-standard header. This is 88 bits long.
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*/
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Storage::Disk::PCMSegment header(uint8_t type, uint8_t track, uint8_t sector, bool side_two);
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/// The on-disk type used for a 400kb floppy.
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const uint8_t TypeMac400kb = 0x02;
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/// The on-disk type used for a 800kb floppy.
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const uint8_t TypeMac800kb = 0x22;
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}
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/*!
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Produces @c length sync six-and-two format sync bytes. The segment returned
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is @c 10*length bits long.
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*/
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Storage::Disk::PCMSegment six_and_two_sync(int length);
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/*!
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Produces the data section of a five-and-three format sector; the segment returned
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will be 3,336 bits long, encoding the first 256 bytes from @c source.
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(TODO).
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*/
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Storage::Disk::PCMSegment five_and_three_data(const uint8_t *source);
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/*!
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Produces @c length sync five-and-three format sync bytes. The segment returned
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is @c 9*length bits long.
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*/
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Storage::Disk::PCMSegment five_and_three_sync(int length);
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}
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