org.apache.poi.hsmf.parsers.POIFSChunkParser Maven / Gradle / Ivy
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package org.apache.poi.hsmf.parsers;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.poi.hsmf.datatypes.AttachmentChunks;
import org.apache.poi.hsmf.datatypes.ByteChunk;
import org.apache.poi.hsmf.datatypes.Chunk;
import org.apache.poi.hsmf.datatypes.ChunkGroup;
import org.apache.poi.hsmf.datatypes.Chunks;
import org.apache.poi.hsmf.datatypes.DirectoryChunk;
import org.apache.poi.hsmf.datatypes.MAPIProperty;
import org.apache.poi.hsmf.datatypes.MessagePropertiesChunk;
import org.apache.poi.hsmf.datatypes.MessageSubmissionChunk;
import org.apache.poi.hsmf.datatypes.NameIdChunks;
import org.apache.poi.hsmf.datatypes.PropertiesChunk;
import org.apache.poi.hsmf.datatypes.RecipientChunks;
import org.apache.poi.hsmf.datatypes.StoragePropertiesChunk;
import org.apache.poi.hsmf.datatypes.StringChunk;
import org.apache.poi.hsmf.datatypes.Types;
import org.apache.poi.hsmf.datatypes.Types.MAPIType;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.poifs.filesystem.DocumentNode;
import org.apache.poi.poifs.filesystem.Entry;
import org.apache.poi.poifs.filesystem.NPOIFSFileSystem;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
/**
* Processes a POIFS of a .msg file into groups of Chunks, such as
* core data, attachment #1 data, attachment #2 data, recipient
* data and so on.
*/
public final class POIFSChunkParser {
private static POILogger logger = POILogFactory.getLogger(POIFSChunkParser.class);
public static ChunkGroup[] parse(NPOIFSFileSystem fs) throws IOException {
return parse(fs.getRoot());
}
public static ChunkGroup[] parse(DirectoryNode node) throws IOException {
Chunks mainChunks = new Chunks();
ArrayList groups = new ArrayList();
groups.add(mainChunks);
// Find our top level children
// Note - we don't handle children of children yet, as
// there doesn't seem to be any use of that in Outlook
for(Entry entry : node) {
if(entry instanceof DirectoryNode) {
DirectoryNode dir = (DirectoryNode)entry;
ChunkGroup group = null;
// Do we know what to do with it?
if(dir.getName().startsWith(AttachmentChunks.PREFIX)) {
group = new AttachmentChunks(dir.getName());
}
if(dir.getName().startsWith(NameIdChunks.NAME)) {
group = new NameIdChunks();
}
if(dir.getName().startsWith(RecipientChunks.PREFIX)) {
group = new RecipientChunks(dir.getName());
}
if(group != null) {
processChunks(dir, group);
groups.add(group);
} else {
// Unknown directory, skip silently
}
}
}
// Now do the top level chunks
processChunks(node, mainChunks);
// All chunks are now processed, have the ChunkGroup
// match up variable-length properties and their chunks
for (ChunkGroup group : groups) {
group.chunksComplete();
}
// Finish
return groups.toArray(new ChunkGroup[groups.size()]);
}
/**
* Creates all the chunks for a given Directory, but
* doesn't recurse or descend
*/
protected static void processChunks(DirectoryNode node, ChunkGroup grouping) {
for(Entry entry : node) {
if(entry instanceof DocumentNode) {
process(entry, grouping);
} else if(entry instanceof DirectoryNode) {
if(entry.getName().endsWith(Types.DIRECTORY.asFileEnding())) {
process(entry, grouping);
}
}
}
}
/**
* Creates a chunk, and gives it to its parent group
*/
protected static void process(Entry entry, ChunkGroup grouping) {
String entryName = entry.getName();
Chunk chunk = null;
// Is it a properties chunk? (They have special names)
if (entryName.equals(PropertiesChunk.NAME)) {
if (grouping instanceof Chunks) {
// These should be the properties for the message itself
chunk = new MessagePropertiesChunk(grouping);
} else {
// Will be properties on an attachment or recipient
chunk = new StoragePropertiesChunk(grouping);
}
} else {
// Check it's a regular chunk
if(entryName.length() < 9) {
// Name in the wrong format
return;
}
if(entryName.indexOf('_') == -1) {
// Name in the wrong format
return;
}
// Split it into its parts
int splitAt = entryName.lastIndexOf('_');
String namePrefix = entryName.substring(0, splitAt+1);
String ids = entryName.substring(splitAt+1);
// Make sure we got what we expected, should be of
// the form ___
if(namePrefix.equals("Olk10SideProps") ||
namePrefix.equals("Olk10SideProps_")) {
// This is some odd Outlook 2002 thing, skip
return;
} else if(splitAt <= entryName.length()-8) {
// In the right form for a normal chunk
// We'll process this further in a little bit
} else {
// Underscores not the right place, something's wrong
throw new IllegalArgumentException("Invalid chunk name " + entryName);
}
// Now try to turn it into id + type
try {
int chunkId = Integer.parseInt(ids.substring(0, 4), 16);
int typeId = Integer.parseInt(ids.substring(4, 8), 16);
MAPIType type = Types.getById(typeId);
if (type == null) {
type = Types.createCustom(typeId);
}
// Special cases based on the ID
if(chunkId == MAPIProperty.MESSAGE_SUBMISSION_ID.id) {
chunk = new MessageSubmissionChunk(namePrefix, chunkId, type);
}
else {
// Nothing special about this ID
// So, do the usual thing which is by type
if (type == Types.BINARY) {
chunk = new ByteChunk(namePrefix, chunkId, type);
}
else if (type == Types.DIRECTORY) {
if(entry instanceof DirectoryNode) {
chunk = new DirectoryChunk((DirectoryNode)entry, namePrefix, chunkId, type);
}
}
else if (type == Types.ASCII_STRING ||
type == Types.UNICODE_STRING) {
chunk = new StringChunk(namePrefix, chunkId, type);
}
else {
// Type of an unsupported type! Skipping...
}
}
} catch(NumberFormatException e) {
// Name in the wrong format
return;
}
}
if(chunk != null) {
if(entry instanceof DocumentNode) {
DocumentInputStream inp = null;
try {
inp = new DocumentInputStream((DocumentNode)entry);
chunk.readValue(inp);
grouping.record(chunk);
} catch(IOException e) {
logger.log(POILogger.ERROR, "Error reading from part " + entry.getName() + " - " + e.toString());
} finally {
if (inp != null) inp.close();
}
} else {
grouping.record(chunk);
}
}
}
}
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