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This FileFilter exports AppleWorks Spread Sheet (ASP) files.
This commit is contained in:
Robert Greene
parent
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/*
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* AppleCommander - An Apple ][ image utility.
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* Copyright (C) 2002-2003 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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import java.text.NumberFormat;
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/**
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* Export an AppleWorks SpreadSheet file.
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* The spread-sheet file starts with a 300 byte header, followed by
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* multiple cells.
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* <p>
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* See: http://www.gno.org/pub/apple2/doc/apple/filetypes/ftn.1b.xxxx
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* <p>
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* Date Created: Feb 23, 2003
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* @author Rob Greene
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*/
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public class AppleWorksSpreadSheetFileFilter implements FileFilter {
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/**
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* SSMinVers. Ths minimum version of AppleWorks needed
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* to read this file. If this file contains version 3.0-
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* specific functions (such as calculated labels or new
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* functions), this byte will contain the version number
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* 30 ($1E). Otherwise it will be zero ($00).
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*/
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private static final int HEADER_SSMINVERS_BYTE = 242;
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/**
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* Value Constant mask bytes +000 and +001.
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*/
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private static final int CELL_VALUE_CONSTANT_MASK = 0xa0e0;
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/**
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* Value Constant id byte +000 and +001.
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*/
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private static final int CELL_VALUE_CONSTANT_ID = 0xa000;
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/**
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* Value Label mask bytes +000 and +001.
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*/
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private static final int CELL_VALUE_LABEL_MASK = 0xa088;
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/**
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* Value Label id bytes +000 and +001.
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*/
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private static final int CELL_VALUE_LABEL_ID = 0x8088;
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/**
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* Value Formula mask bytes +000 and +001.
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*/
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private static final int CELL_VALUE_FORMULA_MASK = 0xa080;
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/**
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* Value Formula id bytes +000 and +001.
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*/
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private static final int CELL_VALUE_FORMULA_ID = 0x8080;
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/**
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* Propagated Value Cells mask byte +000.
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*/
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private static final int CELL_PROPAGATED_VALUE_MASK = 0xa0;
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/**
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* Propagated Value Cells id byte +000.
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*/
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private static final int CELL_PROPAGATED_VALUE_ID = 0x20;
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/**
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* "Regular" Label Cell mask byte +000.
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*/
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private static final int CELL_LABEL_VALUE_MASK = 0xe0;
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/**
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* "Regular" Label Cell id byte +000.
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*/
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private static final int CELL_LABEL_VALUE_ID = 0x00;
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/**
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* This is the value that the formulas begin at.
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*/
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private static final int FORMULA_OFFSET = 0xc0;
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/**
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* These are the formulas starting at FORMULA_OFFSET.
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*/
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private static final String[] formulaText = {
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"@Deg", "@Rad", "@Pi", "@True", "@False", "@Not", "@IsBlank",
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"@IsNA", "@IsError", "@Exp", "@Ln", "@Log", "@Cos", "@Sin",
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"@Tan", "@ACos", "@ASin", "@ATan2", "@ATan", "@Mod", "@FV",
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"@PV", "@PMT", "@Term", "@Rate", "@Round", "@Or", "@And",
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"@Sum", "@Avg", "@Choose", "@Count", "@Error", "@IRR", "@If",
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"@Int", "@Lookup", "@Max", "@Min", "@NA", "@NPV", "@Sqrt",
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"@Abs", null, "<>", ">=", "<=", "=", ">", "<", ",", "^",
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")", "-", "+", "/", "*", "(", "-", "+", "..", null, null,
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null
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};
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/**
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* The @Error formula requires 3 trailing zero bytes.
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*/
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private static final int FORMULA_ERROR_CODE = 0xe0;
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/**
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* The @NA formula requires 3 trailing zero bytes.
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*/
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private static final int FORMULA_NA_CODE = 0xe7;
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/**
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* The $FD formula control byte indicates the next 8 bytes
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* are a SANE number.
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*/
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private static final int FORMULA_SANE_CODE = 0xfd;
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/**
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* The $FE formula control byte indicates that the next
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* 3 bytes indicate row, column reference.
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*/
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private static final int FORMULA_ROW_COLUMN_CODE = 0xfe;
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/**
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* The $FF formula control byte indicates that a Pascal
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* string follows. The next byte is the length of the string.
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*/
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private static final int FORMULA_STRING_CODE = 0xff;
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/**
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* Process the given FileEntry and return a byte array with filtered data.
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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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ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
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PrintWriter printWriter = new PrintWriter(byteArray, true);
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boolean isVersion30 = (fileData[HEADER_SSMINVERS_BYTE] == 30);
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int offset = 300 + (isVersion30 ? 2 : 0);
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int rowLength = AppleUtil.getWordValue(fileData, offset);
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while (rowLength != 0xffff) {
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int rowNumber = AppleUtil.getWordValue(fileData, offset+2);
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offset+= 4;
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processRow(printWriter, fileData, offset, rowNumber);
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offset+= rowLength - 2;
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rowLength = AppleUtil.getWordValue(fileData, offset);
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}
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// return CSV file:
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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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* @see com.webcodepro.applecommander.storage.FileFilter#getSuggestedFileName(FileEntry)
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*/
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public String getSuggestedFileName(FileEntry fileEntry) {
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return fileEntry.getFilename() + ".csv";
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}
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/**
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* Process an entire row.
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*/
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public void processRow(PrintWriter printWriter, byte[] fileData, int offset, int rowNumber) {
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int column = 0;
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while (true) {
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int rowControl = AppleUtil.getUnsignedByte(fileData[offset]);
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if (rowControl <= 0x7f) { // process row
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if (column > 0) printWriter.print(",");
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processCell(printWriter, fileData, offset+1, rowControl,
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rowNumber, column);
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offset+= rowControl;
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} else if (rowControl < 0xff) { // skip rows
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if (column > 0) printWriter.print(",");
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int columns = rowControl - 0x80;
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skipColumns(column, printWriter, columns);
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column+= columns;
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} else { // end of row ($FF)
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printWriter.println();
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break;
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}
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offset++;
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column++;
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}
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}
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/**
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* Skip the given number of columns.
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*/
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protected void skipColumns(int column, PrintWriter printWriter, int columns) {
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while (columns > 0) {
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if (column > 0) printWriter.print(",");
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printWriter.print("\",\"");
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columns--;
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column++;
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}
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}
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/**
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* Process an individual cell.
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*/
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protected void processCell(PrintWriter printWriter, byte[] fileData,
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int offset, int length, int currentRow, int currentColumn) {
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int byte0 = AppleUtil.getUnsignedByte(fileData[offset]);
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int byte1 = AppleUtil.getUnsignedByte(fileData[offset+1]);
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int cellFlag = (byte0 << 8) + byte1;
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if ((cellFlag & CELL_VALUE_CONSTANT_MASK) == CELL_VALUE_CONSTANT_ID) {
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double value = AppleUtil.getSaneNumber(fileData, offset+2);
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printWriter.print(value);
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} else if ((cellFlag & CELL_VALUE_LABEL_MASK) == CELL_VALUE_LABEL_ID) {
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// This is AW 3.0 or later, skipping until an example is found.
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} else if ((cellFlag & CELL_VALUE_FORMULA_MASK) == CELL_VALUE_FORMULA_ID) {
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int i = 10;
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printWriter.print('"');
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while (i < length) {
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int controlByte = AppleUtil.getUnsignedByte(fileData[offset+i]);
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i++;
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switch (controlByte) {
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case FORMULA_ERROR_CODE:
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i+= 3; // skip 3 zero bytes
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break;
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case FORMULA_NA_CODE:
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i+= 3; // skip 3 zero bytes
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break;
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case FORMULA_SANE_CODE:
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double value = AppleUtil.getSaneNumber(fileData, offset+i);
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printWriter.print(value);
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i+= 8; // skip past SANE number
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break;
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case FORMULA_ROW_COLUMN_CODE:
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int column = fileData[offset+i];
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int row = AppleUtil.getSignedWordValue(fileData, offset+i+1);
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printWriter.print(getColumnReference(currentColumn + column));
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printWriter.print(getRowReference(currentRow + row));
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i+= 3; // skip past row/column reference
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break;
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case FORMULA_STRING_CODE:
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String string = AppleUtil.getPascalString(fileData, offset+i);
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printWriter.print(string);
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i+= string.length() + 1; // skip past string
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break;
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default:
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printWriter.print(formulaText[controlByte - FORMULA_OFFSET]);
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break;
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}
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}
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printWriter.print('"');
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} else if ((byte0 & CELL_PROPAGATED_VALUE_MASK) == CELL_PROPAGATED_VALUE_ID) {
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char ch = (char) AppleUtil.getUnsignedByte(fileData[offset+1]);
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printWriter.print('"');
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for (int i=0; i<8; i++) { // 8 is an arbitrary cell width
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printWriter.print(ch);
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}
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printWriter.print('"');
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} else if ((byte0 & CELL_LABEL_VALUE_MASK) == CELL_LABEL_VALUE_ID) {
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String string = AppleUtil.getString(fileData, offset+1, length-1);
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printWriter.print('"');
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printWriter.print(string);
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printWriter.print('"');
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} else {
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printWriter.print("\"Unknown Cell Contents!\"");
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}
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}
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/**
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* Build a column reference (convert to A or whatever it should be).
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*/
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protected String getColumnReference(int column) {
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int pos1 = column / 26;
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int pos2 = column % 26;
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StringBuffer buf = new StringBuffer();
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if (pos1 > 0) {
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buf.append((char) '@' + pos1);
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}
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buf.append((char)('@' + pos2));
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return buf.toString();
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}
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/**
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* Build a row reference.
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*/
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protected String getRowReference(int row) {
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NumberFormat formatter = NumberFormat.getIntegerInstance();
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return formatter.format(row);
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}
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}
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