125 lines
4.2 KiB
Java
125 lines
4.2 KiB
Java
/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2002 by Robert Greene
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* robgreene at users.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.webcodepro.applecommander.storage;
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import java.io.ByteArrayOutputStream;
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import java.io.PrintWriter;
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/**
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* Filter the given file as an Applesoft file.
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* <p>
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* Applesoft memory format:<br>
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* [Line]<br>
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* ...
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* [Line]<br>
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* <br>
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* where <Line> is:<br>
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* [Next addr - $0000 is end of program] (word)<br>
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* [Line no] (word)<br>
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* [Tokens and/or characters]<br>
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* [End-of-line marker: $00 bytes]
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* <p>
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* Date created: Nov 2, 2002 10:04:10 PM
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* @author: Rob Greene
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*/
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public class ApplesoftFileFilter implements FileFilter {
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private static String tokens[] = { // starts at $80
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" END ", " FOR ", " NEXT ", " DATA ", " INPUT ", " DEL ",
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" DIM ", " READ ", " GR ", " TEXT ", " PR# ", " IN# ",
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" CALL ", " PLOT ", " HLIN ", " VLIN ", " HGR2 ", " HGR ",
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" HCOLOR= ", " HPLOT ", " DRAW ", " XDRAW ", " HTAB ", " HOME ",
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" ROT= ", " SCALE= ", " SHLOAD ", " TRACE ", " NOTRACE ", " NORMAL ",
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" INVERSE ", " FLASH ", " COLOR= ", " POP ", " VTAB ", " HIMEM: ",
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" LOMEM: ", " ONERR ", " RESUME ", " RECALL ", " STORE ", " SPEED= ",
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" LET ", " GOTO ", " RUN ", " IF ", " RESTORE ", " & ",
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" GOSUB ", " RETURN ", " REM ", " STOP ", " ON ", " WAIT ",
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" LOAD ", " SAVE ", " DEF ", " POKE ", " PRINT ", " CONT ",
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" LIST ", " CLEAR ", " GET ", " NEW ", " TAB( ", " TO ",
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" FN ", " SPC( ", " THEN ", " AT ", " NOT ", " STEP ",
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" +", " -", " *", "/", " ^", " AND ",
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" OR ", " >", " =", " <", " SGN", " INT",
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" ABS", " USR", " FRE", " SCRN( ", " PDL", " POS",
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" SQR", " RND", " LOG", " EXP", " COS", " SIN",
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" TAN", " ATN", " PEEK", " LEN", " STR$", " VAL",
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" ASC", " CHR$", " LEFT$", " RIGHT$", " MID$ " };
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/**
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* Constructor for ApplesoftFileFilter.
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*/
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public ApplesoftFileFilter() {
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super();
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}
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/**
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* Process the given FileEntry and return a text image of the Applesoft file.
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* @see com.webcodepro.applecommander.storage.FileFilter#filter(FileEntry)
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*/
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public byte[] filter(FileEntry fileEntry) {
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byte[] fileData = fileEntry.getFileData();
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int offset = 0;
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ByteArrayOutputStream byteArray = new ByteArrayOutputStream(fileData.length * 2);
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PrintWriter printWriter = new PrintWriter(byteArray, true);
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while (offset < fileData.length) {
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int nextAddress = AppleUtil.getWordValue(fileData, offset);
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if (nextAddress == 0) break; // next address of 0 indicates end of program
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offset+= 2;
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int lineNumber = AppleUtil.getWordValue(fileData, offset);
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offset+= 2;
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printWriter.print(lineNumber);
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printWriter.print(' ');
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while (fileData[offset] != 0) {
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byte byt = fileData[offset++];
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if ((byt & 0x80) != 0) {
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int token = AppleUtil.getUnsignedByte(byt) - 0x80;
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if (token >= tokens.length) {
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printWriter.print("<UNKNOWN TOKEN>");
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} else {
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String tokenString = tokens[token];
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printWriter.print(tokenString);
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}
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} else {
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char ch = (char)byt;
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if (ch < 0x20) {
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printWriter.print("<CTRL-");
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printWriter.print((char)('@' + ch));
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printWriter.print(">");
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} else {
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printWriter.print(ch);
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}
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}
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}
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printWriter.println();
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offset++; // skip to next line
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}
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return byteArray.toByteArray();
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}
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/**
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* Give suggested file name.
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*/
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public String getSuggestedFileName(FileEntry fileEntry) {
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String fileName = fileEntry.getFilename().trim();
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if (!fileName.toLowerCase().endsWith(".bas")) {
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fileName = fileName + ".bas";
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}
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return fileName;
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}
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}
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