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54 lines
1.3 KiB
C++
54 lines
1.3 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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#ifndef AppleGCR_hpp
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#define AppleGCR_hpp
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#include <cstdint>
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namespace Storage {
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namespace Encodings {
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namespace AppleGCR {
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/*!
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@returns the eight-bit 13-sector GCR encoding for the low five bits of @c value.
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*/
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unsigned int five_and_three_encoding_for_value(int value);
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/*!
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@returns the eight-bit 16-sector GCR encoding for the low six bits of @c value.
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*/
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unsigned int six_and_two_encoding_for_value(int value);
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/*!
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A block is defined to be five source bytes, which encodes to eight GCR bytes.
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*/
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void encode_five_and_three_block(uint8_t *destination, uint8_t *source);
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/*!
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A block is defined to be three source bytes, which encodes to four GCR bytes.
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*/
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void encode_six_and_two_block(uint8_t *destination, uint8_t *source);
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/*!
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@returns the four bit nibble for the five-bit GCR @c quintet if a valid GCR value; INT_MAX otherwise.
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*/
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// unsigned int decoding_from_quintet(unsigned int quintet);
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/*!
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@returns the byte composed by splitting the dectet into two qintets, decoding each and composing the resulting nibbles.
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*/
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// unsigned int decoding_from_dectet(unsigned int dectet);
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}
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}
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}
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#endif /* AppleGCR_hpp */
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