426 lines
11 KiB
JavaScript
426 lines
11 KiB
JavaScript
/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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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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// var DO = [0x0,0x7,0xE,0x6,0xD,0x5,0xC,0x4,
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// 0xB,0x3,0xA,0x2,0x9,0x1,0x8,0xF];
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export var _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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];
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// var PO = [0x0,0x8,0x1,0x9,0x2,0xa,0x3,0xb,
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// 0x4,0xc,0x5,0xd,0x6,0xe,0x7,0xf];
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export var _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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];
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// var D13O = [
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// 0x0, 0xa, 0x7, 0x4, 0x1, 0xb, 0x8, 0x5, 0x2, 0xc, 0x9, 0x6, 0x3
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// ];
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export var _D13O = [
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0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc
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];
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var _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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];
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var _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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];
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export var 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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];
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/**
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* From Beneath Apple DOS
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*/
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export function fourXfour(val) {
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var xx = val & 0xaa;
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var 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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export function defourXfour(xx, yy) {
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return ((xx << 1) | 0x01) & yy;
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}
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export function explodeSector16(volume, track, sector, data) {
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var checksum;
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var buf = [], idx;
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var 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 (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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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 (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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var nibbles = [];
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var ptr2 = 0;
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var ptr6 = 0x56;
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var idx2, idx6;
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for (idx = 0; idx < 0x156; idx++) {
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nibbles[idx] = 0;
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}
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idx2 = 0x55;
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for (idx6 = 0x101; idx6 >= 0; idx6--) {
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var val6 = data[idx6 % 0x100];
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var val2 = 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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var last = 0;
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for (idx = 0; idx < 0x156; idx++) {
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var 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, 0xf2]); // Epilog DE AA F2
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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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export function explodeSector13(volume, track, sector, data) {
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var checksum;
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var buf = [], idx;
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var 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 (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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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 (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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var nibbles = [];
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var jdx = 0;
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for (idx = 0x32; idx >= 0; idx--) {
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var a5 = data[jdx] >> 3;
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var a3 = data[jdx] & 0x07;
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jdx++;
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var b5 = data[jdx] >> 3;
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var b3 = data[jdx] & 0x07;
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jdx++;
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var c5 = data[jdx] >> 3;
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var c3 = data[jdx] & 0x07;
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jdx++;
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var d5 = data[jdx] >> 3;
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var d3 = data[jdx] & 0x07;
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jdx++;
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var e5 = data[jdx] >> 3;
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var 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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var val;
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var last = 0;
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for (idx = 0x199; idx >= 0x100; idx--) {
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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 (idx = 0x0; idx < 0x100; idx++) {
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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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export function readSector(drive, track, sector) {
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var _sector = drive.fmt == 'po' ? _PO[sector] : _DO[sector];
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var val, state = 0;
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var idx = 0;
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var retry = 0;
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var cur = drive.tracks[track];
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function _readNext() {
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var 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) {
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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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var t = 0, s = 0, v = 0, jdx, kdx, checkSum;
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var data = [];
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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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var data2 = [];
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var last = 0;
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for (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 (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 (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 [];
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}
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export function jsonEncode(cur, pretty) {
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var data = [];
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var format = 'dsk';
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for (var t = 0; t < cur.tracks.length; t++) {
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data[t] = [];
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if (cur.format === 'nib') {
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format = 'nib';
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data[t] = base64_encode(cur.tracks[t]);
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} else {
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for (var s = 0; s < 0x10; s++) {
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data[t][s] = base64_encode(readSector(cur, 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': cur.volume,
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'data': data
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}, null, pretty ? ' ' : null);
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}
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export function jsonDecode(data) {
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var cur = {};
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var tracks = [];
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var json = JSON.parse(data);
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var v = json.volume;
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for (var t = 0; t < json.data.length; t++) {
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var track = [];
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for (var s = 0; s < json.data[t].length; s++) {
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var _s = 15 - s;
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var d = base64_decode(json.data[t][_s]);
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track = track.concat(explodeSector16(v, t, s, d));
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}
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tracks[t] = bytify(track);
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}
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cur.volume = v;
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cur.format = json.type;
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cur.tracks = tracks;
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cur.trackMap = null;
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return cur;
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}
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