590 lines
16 KiB
TypeScript
590 lines
16 KiB
TypeScript
import { bit, byte, memory } from '../types';
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import { base64_decode, base64_encode } from '../base64';
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import { bytify, debug, toHex } from '../util';
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import { NibbleDisk, ENCODING_NIBBLE } from './types';
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/**
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* DOS 3.3 Physical sector order (index is physical sector, value is DOS sector).
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*/
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export const DO = [
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0x0, 0x7, 0xE, 0x6, 0xD, 0x5, 0xC, 0x4,
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0xB, 0x3, 0xA, 0x2, 0x9, 0x1, 0x8, 0xF
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] as const;
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/**
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* DOS 3.3 Logical sector order (index is DOS sector, value is physical sector).
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*/
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export const _DO = [
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0x0, 0xD, 0xB, 0x9, 0x7, 0x5, 0x3, 0x1,
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0xE, 0xC, 0xA, 0x8, 0x6, 0x4, 0x2, 0xF
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] as const;
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/**
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* ProDOS Physical sector order (index is physical sector, value is ProDOS sector).
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*/
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export const PO = [
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0x0, 0x8, 0x1, 0x9, 0x2, 0xa, 0x3, 0xb,
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0x4, 0xc, 0x5, 0xd, 0x6, 0xe, 0x7, 0xf
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] as const;
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/**
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* ProDOS Logical sector order (index is ProDOS sector, value is physical sector).
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*/
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export const _PO = [
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0x0, 0x2, 0x4, 0x6, 0x8, 0xa, 0xc, 0xe,
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0x1, 0x3, 0x5, 0x7, 0x9, 0xb, 0xd, 0xf
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] as const;
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/**
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* DOS 13-sector disk physical sector order (index is disk sector, value is
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* physical sector).
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*/
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export const D13O = [
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0x0, 0xa, 0x7, 0x4, 0x1, 0xb, 0x8, 0x5, 0x2, 0xc, 0x9, 0x6, 0x3
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] as const;
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export const _D13O = [
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0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc
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] as const;
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const _trans53 = [
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0xab, 0xad, 0xae, 0xaf, 0xb5, 0xb6, 0xb7, 0xba,
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0xbb, 0xbd, 0xbe, 0xbf, 0xd6, 0xd7, 0xda, 0xdb,
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0xdd, 0xde, 0xdf, 0xea, 0xeb, 0xed, 0xee, 0xef,
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0xf5, 0xf6, 0xf7, 0xfa, 0xfb, 0xfd, 0xfe, 0xff
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] as const;
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const _trans62 = [
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0x96, 0x97, 0x9a, 0x9b, 0x9d, 0x9e, 0x9f, 0xa6,
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0xa7, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb2, 0xb3,
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0xb4, 0xb5, 0xb6, 0xb7, 0xb9, 0xba, 0xbb, 0xbc,
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0xbd, 0xbe, 0xbf, 0xcb, 0xcd, 0xce, 0xcf, 0xd3,
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0xd6, 0xd7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde,
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0xdf, 0xe5, 0xe6, 0xe7, 0xe9, 0xea, 0xeb, 0xec,
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0xed, 0xee, 0xef, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
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0xf7, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
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] as const;
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export const detrans62 = [
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
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0x00, 0x00, 0x02, 0x03, 0x00, 0x04, 0x05, 0x06,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x08,
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0x00, 0x00, 0x00, 0x09, 0x0A, 0x0B, 0x0C, 0x0D,
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0x00, 0x00, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13,
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0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x1B, 0x00, 0x1C, 0x1D, 0x1E,
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0x00, 0x00, 0x00, 0x1F, 0x00, 0x00, 0x20, 0x21,
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0x00, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x2A, 0x2B,
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0x00, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32,
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0x00, 0x00, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
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0x00, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F
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] as const;
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/**
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* Converts a byte into its 4x4 encoded representation
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*
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* @param val byte to encode.
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* @returns A two byte array of representing the 4x4 encoding.
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*/
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export function fourXfour(val: byte): [xx: byte, yy: byte] {
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let xx = val & 0xaa;
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let yy = val & 0x55;
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xx >>= 1;
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xx |= 0xaa;
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yy |= 0xaa;
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return [xx, yy];
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}
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/**
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* Converts 2 4x4 encoded bytes into a byte value
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*
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* @param xx First encoded byte.
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* @param yy Second encoded byte.
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* @returns The decoded value.
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*/
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export function defourXfour(xx: byte, yy: byte): byte {
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return ((xx << 1) | 0x01) & yy;
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}
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/**
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* Converts a raw sector into a nibblized representation to be combined into a
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* nibblized 16 sector track.
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*
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* @param volume volume number
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* @param track track number
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* @param sector sector number
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* @param data sector data
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* @returns a nibblized representation of the sector data
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*/
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export function explodeSector16(volume: byte, track: byte, sector: byte, data: memory): byte[] {
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let buf = [];
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let gap;
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/*
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* Gap 1/3 (40/0x28 bytes)
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*/
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if (sector === 0) // Gap 1
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gap = 0x80;
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else { // Gap 3
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gap = track === 0 ? 0x28 : 0x26;
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}
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for (let idx = 0; idx < gap; idx++) {
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buf.push(0xff);
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}
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/*
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* Address Field
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*/
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const checksum = volume ^ track ^ sector;
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buf = buf.concat([0xd5, 0xaa, 0x96]); // Address Prolog D5 AA 96
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buf = buf.concat(fourXfour(volume));
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buf = buf.concat(fourXfour(track));
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buf = buf.concat(fourXfour(sector));
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buf = buf.concat(fourXfour(checksum));
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buf = buf.concat([0xde, 0xaa, 0xeb]); // Epilog DE AA EB
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/*
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* Gap 2 (5 bytes)
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*/
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for (let idx = 0; idx < 0x05; idx++) {
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buf.push(0xff);
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}
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/*
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* Data Field
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*/
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buf = buf.concat([0xd5, 0xaa, 0xad]); // Data Prolog D5 AA AD
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const nibbles: byte[] = [];
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const ptr2 = 0;
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const ptr6 = 0x56;
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for (let idx = 0; idx < 0x156; idx++) {
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nibbles[idx] = 0;
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}
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let idx2 = 0x55;
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for (let idx6 = 0x101; idx6 >= 0; idx6--) {
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let val6 = data[idx6 % 0x100];
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let val2: byte = nibbles[ptr2 + idx2];
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val2 = (val2 << 1) | (val6 & 1);
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val6 >>= 1;
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val2 = (val2 << 1) | (val6 & 1);
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val6 >>= 1;
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nibbles[ptr6 + idx6] = val6;
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nibbles[ptr2 + idx2] = val2;
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if (--idx2 < 0)
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idx2 = 0x55;
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}
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let last = 0;
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for (let idx = 0; idx < 0x156; idx++) {
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const val = nibbles[idx];
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buf.push(_trans62[last ^ val]);
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last = val;
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}
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buf.push(_trans62[last]);
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buf = buf.concat([0xde, 0xaa, 0xeb]); // Epilog DE AA EB
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/*
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* Gap 3
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*/
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buf.push(0xff);
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return buf;
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}
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/**
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* Converts a raw sector into a nibblized representation to be combined into
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* a nibblized 13 sector track.
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*
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* @param volume volume number
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* @param track track number
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* @param sector sector number
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* @param data sector data
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* @returns a nibblized representation of the sector data
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*/
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export function explodeSector13(volume: byte, track: byte, sector: byte, data: memory): byte[] {
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let buf = [];
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let gap;
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/*
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* Gap 1/3 (40/0x28 bytes)
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*/
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if (sector === 0) // Gap 1
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gap = 0x80;
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else { // Gap 3
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gap = track === 0 ? 0x28 : 0x26;
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}
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for (let idx = 0; idx < gap; idx++) {
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buf.push(0xff);
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}
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/*
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* Address Field
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*/
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const checksum = volume ^ track ^ sector;
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buf = buf.concat([0xd5, 0xaa, 0xb5]); // Address Prolog D5 AA B5
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buf = buf.concat(fourXfour(volume));
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buf = buf.concat(fourXfour(track));
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buf = buf.concat(fourXfour(sector));
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buf = buf.concat(fourXfour(checksum));
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buf = buf.concat([0xde, 0xaa, 0xeb]); // Epilog DE AA EB
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/*
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* Gap 2 (5 bytes)
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*/
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for (let idx = 0; idx < 0x05; idx++) {
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buf.push(0xff);
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}
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/*
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* Data Field
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*/
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buf = buf.concat([0xd5, 0xaa, 0xad]); // Data Prolog D5 AA AD
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const nibbles = [];
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let jdx = 0;
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for (let idx = 0x32; idx >= 0; idx--) {
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const a5 = data[jdx] >> 3;
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const a3 = data[jdx] & 0x07;
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jdx++;
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const b5 = data[jdx] >> 3;
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const b3 = data[jdx] & 0x07;
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jdx++;
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const c5 = data[jdx] >> 3;
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const c3 = data[jdx] & 0x07;
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jdx++;
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const d5 = data[jdx] >> 3;
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const d3 = data[jdx] & 0x07;
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jdx++;
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const e5 = data[jdx] >> 3;
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const e3 = data[jdx] & 0x07;
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jdx++;
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nibbles[idx + 0x00] = a5;
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nibbles[idx + 0x33] = b5;
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nibbles[idx + 0x66] = c5;
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nibbles[idx + 0x99] = d5;
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nibbles[idx + 0xcc] = e5;
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nibbles[idx + 0x100] = a3 << 2 | (d3 & 0x4) >> 1 | (e3 & 0x4) >> 2;
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nibbles[idx + 0x133] = b3 << 2 | (d3 & 0x2) | (e3 & 0x2) >> 1;
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nibbles[idx + 0x166] = c3 << 2 | (d3 & 0x1) << 1 | (e3 & 0x1);
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}
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nibbles[0xff] = data[jdx] >> 3;
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nibbles[0x199] = data[jdx] & 0x07;
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let last = 0;
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for (let idx = 0x199; idx >= 0x100; idx--) {
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const val = nibbles[idx];
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buf.push(_trans53[last ^ val]);
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last = val;
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}
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for (let idx = 0x0; idx < 0x100; idx++) {
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const val = nibbles[idx];
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buf.push(_trans53[last ^ val]);
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last = val;
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}
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buf.push(_trans53[last]);
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buf = buf.concat([0xde, 0xaa, 0xeb]); // Epilog DE AA EB
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/*
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* Gap 3
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*/
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buf.push(0xff);
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return buf;
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}
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/**
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* Reads a sector of data from a nibblized disk
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*
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* TODO(flan): Does not work on WOZ disks
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*
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* @param disk Nibble disk
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* @param track track number to read
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* @param sector sector number to read
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* @returns An array of sector data bytes.
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*/
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export function readSector(disk: NibbleDisk, track: byte, sector: byte): memory {
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const _sector = disk.format == 'po' ? _PO[sector] : _DO[sector];
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let val, state = 0;
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let idx = 0;
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let retry = 0;
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const cur = disk.tracks[track];
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function _readNext() {
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const result = cur[idx++];
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if (idx >= cur.length) {
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idx = 0;
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retry++;
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}
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return result;
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}
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function _skipBytes(count: number) {
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idx += count;
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if (idx >= cur.length) {
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idx %= cur.length;
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retry++;
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}
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}
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let t = 0, s = 0, v = 0, checkSum;
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const data = new Uint8Array(256);
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while (retry < 4) {
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switch (state) {
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case 0:
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val = _readNext();
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state = (val === 0xd5) ? 1 : 0;
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break;
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case 1:
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val = _readNext();
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state = (val === 0xaa) ? 2 : 0;
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break;
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case 2:
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val = _readNext();
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state = (val === 0x96) ? 3 : (val === 0xad ? 4 : 0);
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break;
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case 3: // Address
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v = defourXfour(_readNext(), _readNext()); // Volume
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t = defourXfour(_readNext(), _readNext());
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s = defourXfour(_readNext(), _readNext());
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checkSum = defourXfour(_readNext(), _readNext());
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if (checkSum != (v ^ t ^ s)) {
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debug('Invalid header checksum:', toHex(v), toHex(t), toHex(s), toHex(checkSum));
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}
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_skipBytes(3); // Skip footer
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state = 0;
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break;
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case 4: // Data
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if (s === _sector && t === track) {
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const data2 = [];
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let last = 0;
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for (let jdx = 0x55; jdx >= 0; jdx--) {
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val = detrans62[_readNext() - 0x80] ^ last;
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data2[jdx] = val;
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last = val;
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}
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for (let jdx = 0; jdx < 0x100; jdx++) {
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val = detrans62[_readNext() - 0x80] ^ last;
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data[jdx] = val;
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last = val;
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}
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checkSum = detrans62[_readNext() - 0x80] ^ last;
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if (checkSum) {
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debug('Invalid data checksum:', toHex(v), toHex(t), toHex(s), toHex(checkSum));
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}
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for (let kdx = 0, jdx = 0x55; kdx < 0x100; kdx++) {
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data[kdx] <<= 1;
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if ((data2[jdx] & 0x01) !== 0) {
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data[kdx] |= 0x01;
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}
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data2[jdx] >>= 1;
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data[kdx] <<= 1;
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if ((data2[jdx] & 0x01) !== 0) {
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data[kdx] |= 0x01;
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}
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data2[jdx] >>= 1;
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if (--jdx < 0) jdx = 0x55;
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}
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return data;
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}
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else
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_skipBytes(0x159); // Skip data, checksum and footer
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state = 0;
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break;
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default:
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break;
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}
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}
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return new Uint8Array();
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}
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/**
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* Convert a nibblized disk into a JSON string for storage.
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*
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* @param disk Nibblized disk
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* @param pretty Whether to format the output string
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* @returns A JSON string representing the disk
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*/
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export function jsonEncode(disk: NibbleDisk, pretty: boolean): string {
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// For 'nib', tracks are encoded as strings. For all other formats,
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// tracks are arrays of sectors which are encoded as strings.
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const data: string[] | string[][] = [];
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let format = 'dsk';
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for (let t = 0; t < disk.tracks.length; t++) {
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data[t] = [];
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if (disk.format === 'nib') {
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format = 'nib';
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data[t] = base64_encode(disk.tracks[t]);
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} else {
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for (let s = 0; s < 0x10; s++) {
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(data[t] as string[])[s] = base64_encode(readSector(disk, t, s));
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}
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}
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}
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return JSON.stringify({
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'type': format,
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'encoding': 'base64',
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'volume': disk.volume,
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'data': data,
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'readOnly': disk.readOnly,
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}, undefined, pretty ? ' ' : undefined);
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}
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/**
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* Convert a JSON string into a nibblized disk.
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*
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* @param data JSON string representing a disk image, created by [jsonEncode].
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* @returns A nibblized disk
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*/
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export function jsonDecode(data: string): NibbleDisk {
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const tracks: memory[] = [];
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const json = JSON.parse(data);
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const v = json.volume;
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const readOnly = json.readOnly;
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for (let t = 0; t < json.data.length; t++) {
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let track: byte[] = [];
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for (let s = 0; s < json.data[t].length; s++) {
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const _s = json.type == 'po' ? PO[s] : DO[s];
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const sector: string = json.data[t][_s];
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const d = base64_decode(sector);
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track = track.concat(explodeSector16(v, t, s, d));
|
|
}
|
|
tracks[t] = bytify(track);
|
|
}
|
|
const disk: NibbleDisk = {
|
|
volume: v,
|
|
format: json.type,
|
|
encoding: ENCODING_NIBBLE,
|
|
name: json.name,
|
|
tracks,
|
|
readOnly,
|
|
};
|
|
|
|
return disk;
|
|
}
|
|
|
|
/**
|
|
* Debugging method that displays the logical sector ordering of a nibblized disk
|
|
*
|
|
* @param disk
|
|
*/
|
|
|
|
export function analyseDisk(disk: NibbleDisk) {
|
|
for (let track = 0; track < 35; track++) {
|
|
let outStr = `${toHex(track)}: `;
|
|
let val, state = 0;
|
|
let idx = 0;
|
|
const cur = disk.tracks[track];
|
|
|
|
const _readNext = () => {
|
|
const result = cur[idx++];
|
|
return result;
|
|
};
|
|
|
|
const _skipBytes = (count: number) => {
|
|
idx += count;
|
|
};
|
|
|
|
let t = 0, s = 0, v = 0, checkSum;
|
|
while (idx < cur.length) {
|
|
switch (state) {
|
|
case 0:
|
|
val = _readNext();
|
|
state = (val === 0xd5) ? 1 : 0;
|
|
break;
|
|
case 1:
|
|
val = _readNext();
|
|
state = (val === 0xaa) ? 2 : 0;
|
|
break;
|
|
case 2:
|
|
val = _readNext();
|
|
state = (val === 0x96) ? 3 : (val === 0xad ? 4 : 0);
|
|
break;
|
|
case 3: // Address
|
|
v = defourXfour(_readNext(), _readNext()); // Volume
|
|
t = defourXfour(_readNext(), _readNext());
|
|
s = defourXfour(_readNext(), _readNext());
|
|
checkSum = defourXfour(_readNext(), _readNext());
|
|
if (checkSum != (v ^ t ^ s)) {
|
|
debug('Invalid header checksum:', toHex(v), toHex(t), toHex(s), toHex(checkSum));
|
|
} else {
|
|
outStr += toHex(s, 1);
|
|
}
|
|
_skipBytes(3); // Skip footer
|
|
state = 0;
|
|
break;
|
|
case 4: // Valid header
|
|
_skipBytes(0x159); // Skip data, checksum and footer
|
|
state = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
debug(outStr);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Debugging utility to convert a bitstream into a nibble. Does not wrap.
|
|
*
|
|
* @param bits Bitstream containing nibbles
|
|
* @param offset Offset into bitstream to start nibblizing
|
|
* @returns nibble, the next nibble in the bitstream,
|
|
* and offset, the end of that nibble in the bitstream
|
|
*/
|
|
|
|
export function grabNibble(bits: bit[], offset: number) {
|
|
let nibble = 0;
|
|
let waitForOne = true;
|
|
|
|
while (offset < bits.length) {
|
|
const bit = bits[offset];
|
|
if (bit) {
|
|
nibble = (nibble << 1) | 0x01;
|
|
waitForOne = false;
|
|
} else {
|
|
if (!waitForOne) {
|
|
nibble = nibble << 1;
|
|
}
|
|
}
|
|
if (nibble & 0x80) {
|
|
// nibble complete return it
|
|
break;
|
|
}
|
|
offset += 1;
|
|
}
|
|
|
|
return {
|
|
nibble: nibble,
|
|
offset: offset
|
|
};
|
|
}
|