/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(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.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.hmef.attribute;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hmef.Attachment;
import org.apache.poi.hmef.HMEFMessage;
import org.apache.poi.hsmf.datatypes.MAPIProperty;
import org.apache.poi.hsmf.datatypes.Types;
import org.apache.poi.hsmf.datatypes.Types.MAPIType;
import org.apache.poi.util.HexDump;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.StringUtil;
/**
* A pure-MAPI attribute which applies to a {@link HMEFMessage}
* or one of its {@link Attachment}s.
*/
public class MAPIAttribute {
private final MAPIProperty property;
private final int type;
private final byte[] data;
/**
* Constructs a single new attribute from
* the contents of the stream
*/
public MAPIAttribute(MAPIProperty property, int type, byte[] data) {
this.property = property;
this.type = type;
this.data = data.clone();
}
public MAPIProperty getProperty() {
return property;
}
public int getType() {
return type;
}
public byte[] getData() {
return data;
}
public String toString() {
String hex;
if(data.length <= 16) {
hex = HexDump.toHex(data);
} else {
byte[] d = new byte[16];
System.arraycopy(data, 0, d, 0, 16);
hex = HexDump.toHex(d);
hex = hex.substring(0, hex.length()-1) + ", ....]";
}
return property + " " + hex;
}
/**
* Parses a MAPI Properties TNEF Attribute, and returns
* the list of MAPI Attributes contained within it
*/
public static List<MAPIAttribute> create(TNEFAttribute parent) throws IOException {
if(parent.getProperty() == TNEFProperty.ID_MAPIPROPERTIES) {
// Regular MAPI Properties, normally on the message
}
else if(parent.getProperty() == TNEFProperty.ID_ATTACHMENT) {
// MAPI Properties for an attachment
}
else {
// Something else, oh dear...
throw new IllegalArgumentException(
"Can only create from a MAPIProperty attribute, " +
"instead received a " + parent.getProperty() + " one"
);
}
ByteArrayInputStream inp = new ByteArrayInputStream(parent.getData());
// First up, get the number of attributes
int count = LittleEndian.readInt(inp);
List<MAPIAttribute> attrs = new ArrayList<MAPIAttribute>();
// Now, read each one in in turn
for(int i=0; i<count; i++) {
int typeAndMV = LittleEndian.readUShort(inp);
int id = LittleEndian.readUShort(inp);
// Is it either Multi-Valued or Variable-Length?
boolean isMV = false;
boolean isVL = false;
int typeId = typeAndMV;
if( (typeAndMV & Types.MULTIVALUED_FLAG) != 0 ) {
isMV = true;
typeId -= Types.MULTIVALUED_FLAG;
}
if(typeId == Types.ASCII_STRING.getId() || typeId == Types.UNICODE_STRING.getId() ||
typeId == Types.BINARY.getId() || typeId == Types.DIRECTORY.getId()) {
isVL = true;
}
// Turn the type ID into a strongly typed thing
MAPIType type = Types.getById(typeId);
if (type == null) {
type = Types.createCustom(typeId);
}
// If it's a named property, rather than a standard
// MAPI property, grab the details of it
MAPIProperty prop = MAPIProperty.get(id);
if(id >= 0x8000 && id <= 0xFFFF) {
byte[] guid = new byte[16];
IOUtils.readFully(inp, guid);
int mptype = LittleEndian.readInt(inp);
// Get the name of it
String name;
if(mptype == 0) {
// It's based on a normal one
int mpid = LittleEndian.readInt(inp);
MAPIProperty base = MAPIProperty.get(mpid);
name = base.name;
} else {
// Custom name was stored
int mplen = LittleEndian.readInt(inp);
byte[] mpdata = new byte[mplen];
IOUtils.readFully(inp, mpdata);
name = StringUtil.getFromUnicodeLE(mpdata, 0, (mplen/2)-1);
skipToBoundary(mplen, inp);
}
// Now create
prop = MAPIProperty.createCustom(id, type, name);
}
if(prop == MAPIProperty.UNKNOWN) {
prop = MAPIProperty.createCustom(id, type, "(unknown " + Integer.toHexString(id) + ")");
}
// Now read in the value(s)
int values = 1;
if(isMV || isVL) {
values = LittleEndian.readInt(inp);
}
for(int j=0; j<values; j++) {
int len = getLength(type, inp);
byte[] data = new byte[len];
IOUtils.readFully(inp, data);
skipToBoundary(len, inp);
// Create
MAPIAttribute attr;
if(type == Types.UNICODE_STRING || type == Types.ASCII_STRING) {
attr = new MAPIStringAttribute(prop, typeId, data);
} else if(type == Types.APP_TIME || type == Types.TIME) {
attr = new MAPIDateAttribute(prop, typeId, data);
} else if(id == MAPIProperty.RTF_COMPRESSED.id) {
attr = new MAPIRtfAttribute(prop, typeId, data);
} else {
attr = new MAPIAttribute(prop, typeId, data);
}
attrs.add(attr);
}
}
// All done
return attrs;
}
private static int getLength(MAPIType type, InputStream inp) throws IOException {
if (type.isFixedLength()) {
return type.getLength();
}
if (type == Types.ASCII_STRING ||
type == Types.UNICODE_STRING ||
type == Types.DIRECTORY ||
type == Types.BINARY) {
// Need to read the length, as it varies
return LittleEndian.readInt(inp);
} else {
throw new IllegalArgumentException("Unknown type " + type);
}
}
private static void skipToBoundary(int length, InputStream inp) throws IOException {
// Data is always padded out to a 4 byte boundary
if(length % 4 != 0) {
int skip = 4 - (length % 4);
byte[] padding = new byte[skip];
IOUtils.readFully(inp, padding);
}
}
}