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CLK/Storage/Disk/Encodings/CommodoreGCR.hpp

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//
// CommodoreGCR.hpp
// Clock Signal
//
// Created by Thomas Harte on 29/07/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#ifndef Storage_Disk_Encodings_CommodoreGCR_hpp
#define Storage_Disk_Encodings_CommodoreGCR_hpp
#include "../../Storage.hpp"
#include <cstdint>
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namespace Storage::Encodings {
namespace CommodoreGCR {
/*!
@returns the proportion of a second that each bit of data within the specified @c time_zone
should idiomatically occupy.
*/
Time length_of_a_bit_in_time_zone(unsigned int time_zone);
/*!
@returns the five-bit GCR encoding for the low four bits of @c nibble.
*/
unsigned int encoding_for_nibble(uint8_t nibble);
/*!
@returns the ten-bit GCR encoding for @c byte.
*/
unsigned int encoding_for_byte(uint8_t byte);
/*!
A block is defined to be four source bytes, which encodes to five GCR bytes.
*/
void encode_block(uint8_t *destination, uint8_t *source);
/*!
@returns the four bit nibble for the five-bit GCR @c quintet if a valid GCR value; INT_MAX otherwise.
*/
unsigned int decoding_from_quintet(unsigned int quintet);
/*!
@returns the byte composed by splitting the dectet into two qintets, decoding each and composing the resulting nibbles.
*/
unsigned int decoding_from_dectet(unsigned int dectet);
}
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}
#endif /* CommodoreGCR_hpp */