133 lines
4.8 KiB
Java
133 lines
4.8 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 Integer BASIC file.
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* <p>
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* On disk, it looks similar to Applesoft - first two bytes are length; rest of
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* image is raw data for Integer Basic.
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* <p>
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* [byte] length of line<br>
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* [word] line number<br>
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* [byte]* line data<br>
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* $01 end of line<br>
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* Repeat until end of program (line length of 0).
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* <p>
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* Tokens are $00 - $7F, some are duplicated.<br>
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* $01 = end of line.<br>
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* $B0 - $B9 = signifies a number stored in a word.<br>
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* <p>
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* Date created: Nov 3, 2002 1:14:47 AM
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* @author: Rob Greene
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*/
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public class IntegerBasicFileFilter implements FileFilter {
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private static String[] tokens = {
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null, null, null, ": ", "LOAD ", "SAVE ", null, "RUN ", // $00-$07
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null, "DEL ", ", ", "NEW ", "CLR ", "AUTO ", null, "MAN ", // $08-$0F
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"HIMEM: ", "LOMEM: ", "+", "-", "*", "/", "=", "#", // $10-$17
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">=", ">", "<=", "<>", "<", " AND ", " OR ", " MOD ",// $18-$1F
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"^", null, "(", ",", " THEN ", " THEN ", ",", ",", // $20-$27
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"\"", "\"", "(", null, null, "(", " PEEK ", "RND ", // $28-$2F
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"SGN ", "ABS ", "PDL ", null, "(", "+", "-", "NOT ", // $30-$37
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"(", "=", "#", " LEN(", " ASC(", " SCRN(", ",", " (", // $38-$3F
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"$", null, "(", ",", ",", ";", ";", ";", // $40-$47
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",", ",", ",", "TEXT ", "GR ", "CALL ", "DIM ", "DIM ", // $48-$4F
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"TAB ", "END ", "INPUT ", "INPUT ", "INPUT ", "FOR ", "=", " TO ", // $50-$57
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" STEP ", "NEXT ", ",", "RETURN ", "GOSUB ", "REM ", "LET ", "GOTO ",// $58-$5F
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"IF ", "PRINT ", "PRINT ", "PRINT ", " POKE ", ",", "COLOR= ", "PLOT ",// $60-$67
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",", "HLIN ", ",", " AT ", "VLIN ", ",", " AT ", "VTAB ",// $68-$6F
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"=", "=", ")", null, "LIST ", ",", null, "POP ", // $70-$77
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null, "NO DSP ", "NO TRACE ", "DSP ", "DSP ", "TRACE ", "PR # ", "IN # " // $78-$7F
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};
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/**
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* Constructor for IntegerBasicFileFilter.
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*/
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public IntegerBasicFileFilter() {
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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 Integer BASIC 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 lineLength = AppleUtil.getUnsignedByte(fileData[offset]);
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int lineNumber = AppleUtil.getWordValue(fileData, offset+1);
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boolean inComment = false;
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printWriter.print(lineNumber);
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printWriter.print(' ');
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for (int i=offset+3; i<(offset+lineLength); i++) {
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byte byt = fileData[i];
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if ((byt & 0x80) != 0) {
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int value = AppleUtil.getUnsignedByte(byt);
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// numbers follow a number digit
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if (!inComment && value >= 0xb1 && value <= 0xb9) {
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int integer = AppleUtil.getWordValue(fileData, i+1);
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printWriter.print(integer);
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i+= 2;
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} else {
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char ch = (char)(byt&0x7f);
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if (ch < 0x20) { // handle control characters
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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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} else {
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String token = tokens[(int)byt];
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if (token != null) {
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printWriter.print(token);
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inComment = (byt == 0x5d); // REM statement
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} else {
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// ignoring unknown tokens
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// $00 and $01 seem to be valid; the others may or may not be valid
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}
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}
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}
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offset+= lineLength;
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printWriter.println();
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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(".int")) {
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fileName = fileName + ".int";
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}
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return fileName;
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}
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}
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