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FileFilter to handle AppleWorks Data Base files and export to
CSV format.
This commit is contained in:
Robert Greene
parent
e3b44972f8
commit
6abc7610ad
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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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/**
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* Export an AppleWorks database file to a text file.
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* Current export is limited to a standard comma-separated file (CSV)
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* file format which should be suitable to load into a database or a
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* spreadsheet.
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* <p>
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* Data base files start with a variable length header, followed by
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* 600 bytes for each report format (if any), the standard values
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* record, then variable length information for each record. Note that
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* the first data record contains the standard (presumably default)
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* values. The category entries are in the same order that the category
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* names appear in the header record.
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* <p>
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* Date Created: February 15, 2003
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* @author Rob Greene
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*/
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public class AppleWorksDataBaseFileFilter implements FileFilter {
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/**
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* The number of bytes in the remainder of the header record.
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*/
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private static final int HEADER_LENGTH_WORD = 0;
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/**
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* Number of categories per record. Values from $01 to $1E.
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*/
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private static final int HEADER_CATEGORIES_BYTE = 35;
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/**
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* Number of records in file. If DBMinVers is non-zero,
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* the high bit of this word may be set. If it is,
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* there are more than eight reports and the remaining
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* 15 bits contain the true number of records defined.
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*/
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private static final int HEADER_RECORDS_WORD = 36;
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/**
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* Number of reports in a file, maximum of 8 (20 for AW 3.0).
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*/
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private static final int HEADER_REPORTS_BYTE = 38;
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/**
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* DBMinVers. Ths minimum version of AppleWorks needed
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* to read this file. This will be $0 unless there are
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* more than 8 report formats; it will then contain the
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* version number 30 ($1E) or greater.
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*/
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private static final int HEADER_DBMINVERS_BYTE = 218;
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/**
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* Name of category. Maximum length of 20 bytes. If this
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* is the last category in the file, the header record will
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* end here. This record is 22 bytes in length and will
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* be repeated up to $1E times.
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*/
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private static final int HEADER_CATEGORY_STRING = 357;
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/**
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* Each category name takes up a maximum of 22 bytes.
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*/
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private static final int HEADER_CATEGORY_LENGTH = 22;
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/**
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* Each report is defined in 600 bytes. The current file
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* filter does not deal with reports.
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*/
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private static final int REPORT_LENGTH = 600;
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/**
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* Count of the number of bytes in the remainder of the
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* data record.
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*/
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private static final int DATA_LENGTH_WORD = 0;
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/**
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* Data control record indicating that a number of
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* categories need to be skipped. This (minus $80)
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* is a count of the number of categories to be skipped.
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* For example, $82 means skip two categories.
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*/
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private static final int DATA_CONTROL_SKIP = 0x80;
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/**
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* Indicates the end of a record.
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*/
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private static final int DATA_CONTROL_END = 0xff;
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/**
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* Indicates a date entry.
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*/
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private static final int DATA_CONTROL_DATE = 0xc0;
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/**
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* ASCII year code, like "84" ($38 $34).
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*/
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private static final int DATE_YEAR_OFFSET = 1;
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/**
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* ASCII month code. "A" means January, "L" means
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* December.
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*/
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private static final int DATE_MONTH_OFFSET = 3;
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/**
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* List of months used for date conversion.
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*/
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private static final String[] months = {
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"January", "February", "March", "April",
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"May", "June", "July", "August", "September",
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"October", "November", "December"
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};
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/**
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* ASCII day of the month, like "31" ($33 $31).
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*/
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private static final int DATE_DAY_OFFSET = 4;
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/**
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* The length of a date is 6 bytes.
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*/
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private static final int DATE_LENGTH = 6;
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/**
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* Indicates a time entry.
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*/
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private static final int DATA_CONTROL_TIME = 0xd4;
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/**
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* ASCII hour code. "A" means 00 (the hour after
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* midnight). "X" means 23, the hour before midnight.
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*/
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private static final int TIME_HOUR_OFFSET = 1;
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/**
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* ASCII minute code. Values from "00" to "59".
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*/
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private static final int TIME_MINUTE_OFFSET = 2;
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/**
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* Length of a time entry is 4 bytes.
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*/
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private static final int TIME_LENGTH = 4;
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/**
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* Create an AppleWorksDataBaseFileFilter.
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*/
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public AppleWorksDataBaseFileFilter() {
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super();
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}
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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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// process header information:
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int headerLength = AppleUtil.getWordValue(fileData, HEADER_LENGTH_WORD)
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+ 2; // does not include this word!
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int categoryCount = AppleUtil.getUnsignedByte(
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fileData[HEADER_CATEGORIES_BYTE]);
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int recordCount = AppleUtil.getWordValue(fileData, HEADER_RECORDS_WORD);
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int reportCount = AppleUtil.getUnsignedByte(
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fileData[HEADER_REPORTS_BYTE]);
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int dbMinVers = AppleUtil.getUnsignedByte(
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fileData[HEADER_DBMINVERS_BYTE]);
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if (dbMinVers > 0x00 && (recordCount & 0x8000) != 0) {
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recordCount &= 0x7fff; // adjust for "more than 8 reports" flag
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}
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int offset = HEADER_CATEGORY_STRING;
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for (int i=0; i<categoryCount; i++) {
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String name = AppleUtil.getProdosString(fileData, offset);
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if (i > 0) printWriter.print(",");
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printWriter.print('"');
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printWriter.print(name);
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printWriter.print('"');
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offset+= HEADER_CATEGORY_LENGTH;
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}
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printWriter.println();
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if (offset != headerLength) {
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throw new IndexOutOfBoundsException(
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"AppleWorks Data Base file header lenth does not check. Aborting.");
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}
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// skip reports:
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offset+= (reportCount * REPORT_LENGTH);
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// process data:
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for (int i=0; i<recordCount+1; i++) {
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int length = AppleUtil.getWordValue(fileData, offset)
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+ 2; // does not include this word!
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int data = offset + 2;
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int column = 0;
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while (AppleUtil.getUnsignedByte(fileData[data]) != DATA_CONTROL_END) {
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if (column > 0) printWriter.print(',');
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int controlByte = AppleUtil.getUnsignedByte(fileData[data]);
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switch (controlByte) {
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case DATA_CONTROL_DATE:
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printWriter.print('0' + (AppleUtil.getUnsignedByte(
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fileData[data + DATE_YEAR_OFFSET]) - 0x30));
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printWriter.print('0' + (AppleUtil.getUnsignedByte(
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fileData[data + DATE_YEAR_OFFSET + 1]) - 0x30));
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printWriter.print(months[AppleUtil.getUnsignedByte(
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fileData[data + DATE_MONTH_OFFSET - 'A'])]);
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printWriter.print('0' + (AppleUtil.getUnsignedByte(
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fileData[data + DATE_DAY_OFFSET]) - 0x30));
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printWriter.print('0' + (AppleUtil.getUnsignedByte(
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fileData[data + DATE_DAY_OFFSET + 1]) - 0x30));
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data+= DATE_LENGTH;
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break;
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case DATA_CONTROL_TIME:
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printWriter.print(AppleUtil.getUnsignedByte(
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fileData[data + TIME_HOUR_OFFSET]) - 'A');
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printWriter.print('0' + AppleUtil.getUnsignedByte(
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fileData[data + TIME_MINUTE_OFFSET]) - 0x30);
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printWriter.print('0' + AppleUtil.getUnsignedByte(
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fileData[data + TIME_MINUTE_OFFSET + 1]) - 0x30);
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data+= TIME_LENGTH;
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break;
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default:
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if (controlByte < DATA_CONTROL_SKIP) {
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String string = AppleUtil.getProdosString(fileData, data);
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data+= string.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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// FIXME need to skip records..
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}
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}
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column++;
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}
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offset+= length;
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printWriter.println();
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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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