зеркало из https://github.com/mozilla/gecko-dev.git
296 строки
11 KiB
Java
296 строки
11 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>, 28 Sep 1997.
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*/
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package grendel.storage;
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import calypso.util.ByteBuf;
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import java.util.Vector;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.io.File;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.BufferedInputStream;
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import java.io.FileInputStream;
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import java.io.IOException;
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/** This class knows how to read a Netscape 2.0 / 3.0 mail summary file.
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It does not know how to write them, because our new internal representation
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of messages doesn't keep around enough information to regenerate the file
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compatibly (doing so would consume a lot more memory.)
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*/
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/* The summary format, as documented in ns/lib/libmsg/mailsum.h:
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MAGIC_NUMBER VERSION FOLDER_SIZE FOLDER_DATE PARSED_THRU NMSGS NVALIDMSGS
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NUNREADMSGS DELETED_BYTES STRING_TABLE [ MSG_DESC ]*
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MAGIC_NUMBER := '# Netscape folder cache\r\n'
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VERSION := uint32 (file format version number; this is version 4)
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FOLDER_SIZE := uint32 (the size of the folder itself, so that we can
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easily detect an out-of-date summary file)
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FOLDER_DATE := uint32 (time_t of the folder; same purpose as above)
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PARSED_THRU := uint32 (the last position in the folder that we have
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parsed data for. Normally the same as
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FOLDER_SIZE, but if we append messages to a file,
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we can just update FOLDER_SIZE and FOLDER_SIZE and
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use this field to tell us what part of the
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folder needs to be parsed.)
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NMSGS := uint32 (total number of messages in this folder, including
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deleted messages)
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NVALIDMSGS := uint32 (total number of non-deleted messages in this
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folder)
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NUNREADMSGS := uint32 (total number of unread messages in this folder)
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DELETED_BYTES := uint32 (number of bytes of messages which have been
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deleted from the summary, but not yet compacted out
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of the folder file itself. The messages in question
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have the DELETED bit set in their flags.)
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STRING_TABLE := ST_LENGTH [ ST_STRING ]+
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ST_LENGTH := uint16
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ST_STRING := null terminated string
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MSG_DESC := SENDER RECIPIENT SUBJECT DATE LINES ID REFERENCES
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FLAGS POS LENGTH STATUSINDEX
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SENDER := uint16 (index into STRING_TABLE)
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RECIPIENT := uint16 (index into STRING_TABLE)
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SUBJECT := uint16 (index into STRING_TABLE)
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DATE := uint32 (time_t)
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FLAGS := uint32 (bitfield of other attributes of the message;
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this is in `X-Mozilla-Status' format.)
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POS := uint32 (byte index into file)
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LENGTH := uint32 (length in bytes from envelope to end of last line)
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STATUSOFFSET := uint16 (Offset from beginning of message envelope for
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X-Mozilla-Status header)
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LINES := uint16 (length in lines; but I think this was unused...)
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ID := uint16 (index into STRING_TABLE)
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REFERENCES := RLENGTH [ ID ]*
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RLENGTH := uint16
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*/
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class MailSummaryFileCheddar extends MailSummaryFile {
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MailSummaryFileCheddar(BerkeleyFolder folder) {
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super(folder);
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}
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synchronized long readSummaryFile(InputStream sum) throws IOException {
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// At the point at which this method is called, MAGIC_NUMBER and VERSION
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// have already been read.
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long folder_size = readUnsignedInteger(sum);
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long folder_date = readUnsignedInteger(sum);
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long old_thru = readUnsignedInteger(sum); // old parsed_thru
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long nmsgs = readUnsignedInteger(sum);
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long nvalidmsgs = readUnsignedInteger(sum);
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long nunreadmsgs = readUnsignedInteger(sum);
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long deletedbytes = readUnsignedInteger(sum);
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int table_length = readUnsignedShort(sum);
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boolean pessimistic = false;
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if (!checkFolderDate(folder_date)) {
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System.err.println("warning: folder " + folder.getName() +
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" is newer than summary file" +
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// " (" + this.file_date + ", " +
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// folder_date*1000L + ")" +
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"; attempting salvage.");
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pessimistic = true;
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} else if (!checkFolderSize(folder_size)) {
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System.err.println("warning: folder " + folder.getName() + " is not " +
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folder_size + " bytes, as summary file expected; " +
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"\n\t attempting salvage.");
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pessimistic = true;
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}
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ByteBuf table[] = new ByteBuf[table_length];
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// Read N null-terminated strings.
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for (int i = 0; i < table_length; i++) {
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ByteBuf bb = new ByteBuf();
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for (int j = 0;; j++) {
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int b = sum.read();
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if (b == 0) break;
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if (b == -1) throw new IOException();
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bb.append((byte) b);
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}
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table[i] = bb;
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}
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Vector msgs = (pessimistic
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? null
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: new Vector((int) nmsgs));
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if (pessimistic)
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salvage = new Hashtable((int) nmsgs);
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boolean success = false;
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try { // if we fail for some reason, set up the `salvage' table
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// Read N message descriptors.
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for (int i = 0; i < nmsgs; i++) {
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int sender = readUnsignedShort(sum);
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int recipient = readUnsignedShort(sum);
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int subject = readUnsignedShort(sum);
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long date = readUnsignedInteger(sum);
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long flags = readUnsignedInteger(sum);
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long pos = readUnsignedInteger(sum);
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long length = readUnsignedInteger(sum);
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int statusoff = readUnsignedShort(sum);
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int lines = readUnsignedShort(sum);
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int id = readUnsignedShort(sum);
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int rlength = readUnsignedShort(sum);
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ByteBuf refs[] = null;
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if (rlength > 0) {
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refs = new ByteBuf[rlength];
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for (int j = 0; j < rlength; j++) {
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refs[j] = table[readUnsignedShort(sum)];
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}
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}
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if (pessimistic) {
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refs = null;
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ByteBuf bid = table[id];
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MessageID mid = new MessageID(bid.toBytes(), 0, bid.length());
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salvage.put(mid, new Long(flags));
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} else {
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flags = BerkeleyMessage.mozillaFlagsToInternalFlags(flags);
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BerkeleyMessage m = new BerkeleyMessage(folder,
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date * 1000L,
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flags,
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table[sender],
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table[recipient],
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table[subject],
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table[id],
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refs);
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refs = null;
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m.setSize((int) length);
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msgs.addElement(m);
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}
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}
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success = true;
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} finally {
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table = null;
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if (!success &&
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msgs != null) {
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// We got some kind of error while reading the message data.
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// The `msgs' vector contains the messages we were able to parse,
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// but since we got an error, we're not going to actually add them
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// to the folder. But, let's pull the flags out of the messages
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// and populate `salvage' with it (see doc of salvageMessages()
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// for rationale.)
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//
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// Note that if we realized very early that this file was out of
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// date, salvage will have already been populated, and `msgs'
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// will be null. This branch is taken only if the file at first
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// appears to be up to date, but later turns out to be corrupted
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// or truncated.
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//
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if (salvage == null)
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salvage = new Hashtable((int) nmsgs);
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for (Enumeration e = msgs.elements(); e.hasMoreElements();) {
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BerkeleyMessage m = (BerkeleyMessage) e.nextElement();
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salvage.put(m.getMessageID(),
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new Long(m.internalFlagsToMozillaFlags(m.flags)));
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}
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}
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}
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if (pessimistic)
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// Ok, we got what we needed. Tell the caller to go and reparse
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// the folder. It will then call salvageMessages() which will
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// pull stuff out of the hash table we just populated.
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return 0;
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this.total_message_count = (int) nmsgs;
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this.undeleted_message_count = (int) nvalidmsgs;
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this.unread_message_count = (int) nunreadmsgs;
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this.deleted_message_bytes = deletedbytes;
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// Successfully parsed it all; feed the messages into the folder.
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for (Enumeration e = msgs.elements(); e.hasMoreElements();)
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folder.noticeInitialMessage((BerkeleyMessage) e.nextElement());
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msgs = null;
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// Return the byte at which parsing in the folder should begin
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// (the last byte covered by this summary file.)
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return old_thru;
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}
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/** Assumes the salvage table contains Long values which are flags
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in X-Mozilla-Status form. */
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protected void salvageMessage(BerkeleyMessage m, Object salvage_object) {
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long flags = ((Long)salvage_object).longValue();
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m.flags |= m.mozillaFlagsToInternalFlags(flags);
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}
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/** Read only enough of the file to fill in the values of
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total_message_count, undeleted_message_count, unread_message_count,
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and deleted_message_bytes. */
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synchronized protected void getMessageCounts() {
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InputStream in = null;
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try {
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File sum = folder.summaryFileName();
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in = new BufferedInputStream(new FileInputStream(sum));
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// header
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for (int i = 0;
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i < MailSummaryFileFactory.SUMMARY_MAGIC_NUMBER.length;
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i++) {
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if (in.read() != MailSummaryFileFactory.SUMMARY_MAGIC_NUMBER[i])
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return;
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}
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// version number
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if (readUnsignedInteger(in) != MailSummaryFileFactory.VERSION_GRENDEL)
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return;
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readUnsignedInteger(in); // FOLDER_SIZE
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readUnsignedInteger(in); // FOLDER_DATE
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readUnsignedInteger(in); // PARSED_THRU
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total_message_count = (int) readUnsignedInteger(in); // NMSGS
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undeleted_message_count = (int) readUnsignedInteger(in); // NVALIDMSGS
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unread_message_count = (int) readUnsignedInteger(in); // NUNREADMSGS
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deleted_message_bytes = readUnsignedInteger(in); // DELETED_BYTES
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} catch (IOException e) {
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// ignore it.
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} finally {
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if (in != null)
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try {
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in.close();
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} catch (IOException e) {
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}
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}
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}
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}
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