/* * AppleCommander - An Apple ][ image utility. * Copyright (C) 2002-2022 by Robert Greene * robgreene at users.sourceforge.net * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package com.webcodepro.applecommander.storage.filters; import java.io.ByteArrayOutputStream; import java.io.PrintWriter; import com.webcodepro.applecommander.storage.FileEntry; import com.webcodepro.applecommander.storage.FileFilter; import com.webcodepro.applecommander.util.AppleUtil; /** * Filter the given file as an Integer BASIC file. *
* On disk, it looks similar to Applesoft - first two bytes are length; rest of * image is raw data for Integer Basic. *
* [byte] length of line
* [word] line number
* [byte]* line data
* $01 is end of line
* Repeat until end of program (line length of 0).
*
* Tokens are $00 - $7F, some are duplicated.
* $01 is end of line.
* $B0 - $B9 = signifies a number stored in a word.
*
* Date created: Nov 3, 2002 1:14:47 AM
* @author Rob Greene
* Revised filter: Aug 8, 2004 12:45 PM
* @author John B. Matthews
*/
public class IntegerBasicFileFilter implements FileFilter {
private static String[] tokens = {
null, null, null, ":", "LOAD ", "SAVE ", null, "RUN ", // $00-$07
null, "DEL ", ", ", "NEW ", "CLR ", "AUTO ", null, "MAN ", // $08-$0F
"HIMEM:", "LOMEM:", "+", "-", "*", "/", "=", "#", // $10-$17
">=", ">", "<=", "<>", "<", " AND ", " OR ", " MOD ",// $18-$1F
"^", null, "(", ",", " THEN ", " THEN ", ",", ",", // $20-$27
"\"", "\"", "(", null, null, "(", " PEEK ", " RND ",// $28-$2F
"SGN ", "ABS ", "PDL ", null, "(", "+", "-", "NOT ", // $30-$37
"(", "=", "#", " LEN(", " ASC(", " SCRN(", ",", "(", // $38-$3F
"$", null, "(", ",", ",", ";", ";", ";", // $40-$47
",", ",", ",", "TEXT ", "GR ", "CALL ", "DIM ", "DIM ", // $48-$4F
"TAB ", "END ", "INPUT ", "INPUT ", "INPUT ", "FOR ", "=", " TO ", // $50-$57
" STEP ", "NEXT ", ",", "RETURN ", "GOSUB ", "REM ", "LET ", "GOTO ",// $58-$5F
"IF ", "PRINT ", "PRINT ", "PRINT ", " POKE ", ",", "COLOR= ", "PLOT ",// $60-$67
",", "HLIN ", ",", " AT ", "VLIN ", ",", " AT ", "VTAB ",// $68-$6F
"=", "=", ")", null, "LIST ", ",", null, "POP ", // $70-$77
null, "NO DSP ", "NO TRACE ", "DSP ", "DSP ", "TRACE ", "PR # ", "IN # " // $78-$7F
};
/**
* Constructor for IntegerBasicFileFilter.
*/
public IntegerBasicFileFilter() {
super();
}
/**
* Process the given FileEntry and return a text image of the Integer BASIC file.
* @see com.webcodepro.applecommander.storage.FileFilter#filter(FileEntry)
* author John B. Matthews
*/
public byte[] filter(FileEntry fileEntry) {
byte[] fileData = fileEntry.getFileData();
int offset = 0;
ByteArrayOutputStream byteArray = new ByteArrayOutputStream(fileData.length * 2);
PrintWriter printWriter = new PrintWriter(byteArray, true);
while (offset < fileData.length) {
int lineLength = AppleUtil.getUnsignedByte(fileData[offset]);
int lineNumber = AppleUtil.getWordValue(fileData, offset+1);
if (fileData[offset+lineLength-1] != 0x01) { // sanity check
printWriter.println("Listing error: possible embedded machine code.");
return byteArray.toByteArray();
}
boolean inComment = false;
boolean inLiteral = false;
printWriter.print(lineNumber);
printWriter.print(' ');
int i = offset + 3;
while (i < offset + lineLength) { // do one line
byte b = fileData[i];
char c = (char)(b & 0x7f);
if (inComment) {
while (fileData[i] != 0x01) { // until EOL
c = (char)(fileData[i] & 0x7f);
printWriter.print(c);
i++;
}
inComment = false;
} else if (inLiteral) {
while (fileData[i] != 0x29) { // until close quote
c = (char)(fileData[i] & 0x7f);
if (c < 0x20) { // control
printWriter.print("