Read .DSK and dump catalog
This commit is contained in:
michaelangel007
parent
6f022dd87e
commit
5e854526cf
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@ -0,0 +1,247 @@
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<html>
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<head>
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<script>
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"use strict";
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var gFile,
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gData,
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gCAT_TRK_SEC,
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gCAT_TRK,
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gCAT_SEC,
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gContext,
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MAX_SIZE = 143360;
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const
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FILE_TYPE_TEXT = 0x00,
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FILE_TYPE_INTEGER = 0x01,
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FILE_TYPE_APPLESOFT = 0x02,
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FILE_TYPE_BINARY = 0x04,
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FILE_TYPE_S = 0x08,
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FILE_TYPE_RELOC = 0x10,
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FILE_TYPE_C = 0x20,
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FILE_TYPE_D = 0x40,
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FILE_TYPES = [ 'T', 'I', 'A', 'B', 'S', 'R', 'C', 'D' ];
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console.log( "Loading..." );
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// --- Utility ---
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// Optional: width
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// Optional: character to pad left with, such as '0'; will default to space
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function padLeft( text, width, c )
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{
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if( !width ) return "";
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if( !c ) c = ' ';
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return ("" + new Array( width ).join( c ) + text).slice( -width );
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}
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function makeUnsigned( n )
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{
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return ((n + 256) & 0xFF)|0;
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}
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// @param FILE_TYPE_*
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function makeFileType( fileType )
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{
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var type = 0, raw = fileType;
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while (raw > 0)
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{
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type++;
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raw >>= 1;
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}
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return FILE_TYPES[ type ];
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}
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function parseName( catalogEntry )
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{
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var name = '', c, MAX_FILENAME = 30;
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for( var i = 0; i < MAX_FILENAME; i++ )
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{
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// 0x00: FTOC Track
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// 0x01: FTOC Sector
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// 0x02: Type
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// 0x03: Filename
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c = makeUnsigned( catalogEntry[ 0x3 + i ] ) & 0x7F;
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name += String.fromCharCode( c );
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}
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name = name.trim();
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return name;
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}
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function parseInt16( low, high )
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{
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var n = makeUnsigned( low )
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n += makeUnsigned( high ) * 256;
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return n;
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}
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function readTrackSectorBytes( track, sector, offset, length )
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{
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if (track > 34) alert( "Track > 34" );
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if (sector > 16) alert( "Sector > 16" );
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if (offset >256) alert( "Offset > 256" );
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if( gData )
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{
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var begin = track*16*256 + 256*sector + offset,
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end = begin + length,
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buffer = gData.slice( begin, end );
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return new Int8Array( buffer );
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}
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return null;
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}
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function readCatalogEntry( i )
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{
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var MAX_ENTRY_LENGTH = 0x23,
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MAX_ENTRIES_PER_SECTOR = 7;
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// Catalog $11,C .. $11,1
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if( !gCAT_TRK || !gCAT_SEC )
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return null;
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// Search directory entries
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var div6 = (i / MAX_ENTRIES_PER_SECTOR)|0,
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mod6 = (i % MAX_ENTRIES_PER_SECTOR) ,
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offset = MAX_ENTRY_LENGTH*mod6 + 0xB,
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sector = gCAT_SEC - div6;
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if (sector < 1)
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return null;
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// 0x00: FTOC Track
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// 0x01: FTOC Sector
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// 0x02: Type
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// 0x03: Filename
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// 0x21: Length Low
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// 0x22: Length Hi
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var raw = gCAT_TRK_SEC = readTrackSectorBytes( gCAT_TRK, sector, offset, 35 ),
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entry = {},
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type = makeUnsigned( raw[0x02] );
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entry.track = parseInt ( raw[0x00] );
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entry.sector = parseInt ( raw[0x01] );
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entry.locked = (type >= 128)|0;
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entry.type = makeFileType( type & 0x7F );
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entry.name = parseName ( raw );
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entry.length = parseInt16 ( raw[0x21], raw[0x22] );
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return entry;
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}
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// --- Implementation ---
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/*
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Version 1
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---------------------------------------
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*A 00006 ^HELLO
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*I 00002 APPLESOFT
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*B 00034 PIX
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*B 00034 PICEX
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*B 00065 SEKTOR
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*B 00047 ^VOCAB
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*B 00006 ^CHARSET
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B 00064 CASTLE
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B 00064 BACKUP
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*T 00007 ^TEXT
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*B 00020 @INIT
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*B 00024 @WOLF
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*B 00024 ^THINGS
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---------------------------------------
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Total Files: 13, Sectors Used: 397
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*/
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function catalog()
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{
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var entry, i = 0, LOCKED = [ ' ', '*' ], entries = [], text = (new Array( 40 ).join('-')) + '\n', totalSize = 0;
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do
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{
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entry = readCatalogEntry( i++ );
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if( entry && entry.track )
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{
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text += LOCKED[ entry.locked ] + entry.type + ' ' + padLeft( entry.length, 5, '0' ) + ' ' + entry.name + '\n';
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totalSize += entry.length;
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entries.push( entry );
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}
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} while( entry !== null )
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text += (new Array( 40 ).join('-')) + '\n';
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text += 'Total Files: ' + entries.length + ', Sectors Used: ' + totalSize;
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console.log( text );
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return entries;
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}
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function readFile( name )
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{
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}
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function main()
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{
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console.log( " Done" );
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if (window.File && window.FileList && window.FileReader)
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{
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document.getElementById('id_select_dsk').addEventListener('change', onSelectFile, false);
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}
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var canvas = document.getElementById( "canvas" );
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gContext = canvas.getContext( "2d" );
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// gContext.drawImage( image, x, y );
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}
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// ProgressEvent
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// .target = FileReader
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// .target.result;
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function onLoadFile( e )
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{
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if (e.loaded == MAX_SIZE) // .dsk is < 144K
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{
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gFile = e.target;
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gData = e.target.result;
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// Read VTOC to find CATALOG
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gCAT_TRK_SEC = readTrackSectorBytes( 0x11, 0x00, 1, 2 );
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gCAT_TRK = gCAT_TRK_SEC[0]; // $11
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gCAT_SEC = gCAT_TRK_SEC[1]; // $0C
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catalog();
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}
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}
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function onSelectFile( e )
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{
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var iFile, tFile, aFile = e.target.files, nFile = aFile.length, reader;
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e.stopPropagation();
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e.preventDefault();
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for( iFile = 0; iFile < nFile; iFile++ )
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{
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tFile = aFile[ iFile ];
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if( tFile.size > MAX_SIZE )
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{
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alert( ".dsk images must be <= " + MAX_SIZE );
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break;
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}
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reader = new FileReader();
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reader.onload = onLoadFile;
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reader.readAsArrayBuffer( tFile );
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}
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}
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</script>
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</head>
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<body onload='main();'>
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<input type="file" id='id_select_dsk' style='width:100%'>
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<br>
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<canvas id='canvas' width='560px' height='460px'>
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</body>
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</html>
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