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106 lines
3.7 KiB
Java
106 lines
3.7 KiB
Java
/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1997
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* Netscape Communications Corporation. All Rights Reserved.
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*
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* Created: Jamie Zawinski <jwz@netscape.com>, 2 Oct 1997.
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*/
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package grendel.storage;
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import java.io.InputStream;
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import java.io.IOException;
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class MailSummaryFileFactory {
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static final byte SUMMARY_MAGIC_NUMBER[] =
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"# Netscape folder cache\r\n".getBytes();
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static final int NEOACCESS_MAGIC_NUMBER[] =
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{ 0000, 0036, 0204, 0212 };
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static final int VERSION_CHEDDAR = 4;
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static final int VERSION_DOGBERT = 5;
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static final int VERSION_GRENDEL = 6;
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private MailSummaryFileFactory() {} // all methods are static
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/** Given a folder and a file stream to that folder's summary file,
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this static method parses the header of that file, and returns
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an appropriate MailSummaryFile object (or null if the file is
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not one we recognise.)
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<P> To parse the body of the summary file, use the readSummaryFile()
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on the returned MailSummaryFile object.
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@see MailSummaryFile
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@see MailSummaryFileCheddar
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@see MailSummaryFileGrendel
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*/
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static MailSummaryFile ParseFileHeader(BerkeleyFolder folder,
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InputStream summary_stream) {
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MailSummaryFile result = null;
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LOST: {
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try {
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int b0 = summary_stream.read(); if (b0 == -1) break LOST;
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int b1 = summary_stream.read(); if (b1 == -1) break LOST;
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int b2 = summary_stream.read(); if (b2 == -1) break LOST;
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int b3 = summary_stream.read(); if (b3 == -1) break LOST;
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long version;
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if (b0 == NEOACCESS_MAGIC_NUMBER[0] &&
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b1 == NEOACCESS_MAGIC_NUMBER[1] &&
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b2 == NEOACCESS_MAGIC_NUMBER[2] &&
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b3 == NEOACCESS_MAGIC_NUMBER[3])
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version = VERSION_DOGBERT;
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else {
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if (b0 != SUMMARY_MAGIC_NUMBER[0] ||
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b1 != SUMMARY_MAGIC_NUMBER[1] ||
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b2 != SUMMARY_MAGIC_NUMBER[2] ||
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b3 != SUMMARY_MAGIC_NUMBER[3])
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return null;
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for (int i = 4; i < SUMMARY_MAGIC_NUMBER.length; i++)
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if (summary_stream.read() != SUMMARY_MAGIC_NUMBER[i])
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return null;
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b0 = summary_stream.read(); if (b0 == -1) break LOST;
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b1 = summary_stream.read(); if (b1 == -1) break LOST;
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b2 = summary_stream.read(); if (b2 == -1) break LOST;
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b3 = summary_stream.read(); if (b3 == -1) break LOST;
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version = ((((long)b0) << 24) | (b1 << 16) | (b2 << 8) | b3);
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}
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if (version == VERSION_CHEDDAR)
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result = new MailSummaryFileCheddar(folder);
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else if (version == VERSION_DOGBERT)
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result = null; // we don' know how to read no stinkink NeoAccess...
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else if (version == VERSION_GRENDEL)
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result = new MailSummaryFileGrendel(folder);
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} catch (IOException e) {
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}
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}
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// System.err.println("summary file reader: " +
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// (result == null ? "null" :
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// result.getClass().getName()));
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return result;
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}
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}
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