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