1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* 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 android.util.jar;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.Attributes;
/**
* Reads a JAR file manifest. The specification is here:
* http://java.sun.com/javase/6/docs/technotes/guides/jar/jar.html
*/
class StrictJarManifestReader {
// There are relatively few unique attribute names,
// but a manifest might have thousands of entries.
private final HashMap<String, Attributes.Name> attributeNameCache = new HashMap<String, Attributes.Name>();
private final ByteArrayOutputStream valueBuffer = new ByteArrayOutputStream(80);
private final byte[] buf;
private final int endOfMainSection;
private int pos;
private Attributes.Name name;
private String value;
private int consecutiveLineBreaks = 0;
public StrictJarManifestReader(byte[] buf, Attributes main) throws IOException {
this.buf = buf;
while (readHeader()) {
main.put(name, value);
}
this.endOfMainSection = pos;
}
public void readEntries(Map<String, Attributes> entries, Map<String, StrictJarManifest.Chunk> chunks) throws IOException {
int mark = pos;
while (readHeader()) {
if (!StrictJarManifest.ATTRIBUTE_NAME_NAME.equals(name)) {
throw new IOException("Entry is not named");
}
String entryNameValue = value;
Attributes entry = entries.get(entryNameValue);
if (entry == null) {
entry = new Attributes(12);
}
while (readHeader()) {
entry.put(name, value);
}
if (chunks != null) {
if (chunks.get(entryNameValue) != null) {
// TODO A bug: there might be several verification chunks for
// the same name. I believe they should be used to update
// signature in order of appearance; there are two ways to fix
// this: either use a list of chunks, or decide on used
// signature algorithm in advance and reread the chunks while
// updating the signature; for now a defensive error is thrown
throw new IOException("A jar verifier does not support more than one entry with the same name");
}
chunks.put(entryNameValue, new StrictJarManifest.Chunk(mark, pos));
mark = pos;
}
entries.put(entryNameValue, entry);
}
}
public int getEndOfMainSection() {
return endOfMainSection;
}
/**
* Read a single line from the manifest buffer.
*/
private boolean readHeader() throws IOException {
if (consecutiveLineBreaks > 1) {
// break a section on an empty line
consecutiveLineBreaks = 0;
return false;
}
readName();
consecutiveLineBreaks = 0;
readValue();
// if the last line break is missed, the line
// is ignored by the reference implementation
return consecutiveLineBreaks > 0;
}
private void readName() throws IOException {
int mark = pos;
while (pos < buf.length) {
if (buf[pos++] != ':') {
continue;
}
String nameString = new String(buf, mark, pos - mark - 1, StandardCharsets.US_ASCII);
if (buf[pos++] != ' ') {
throw new IOException(String.format("Invalid value for attribute '%s'", nameString));
}
try {
name = attributeNameCache.get(nameString);
if (name == null) {
name = new Attributes.Name(nameString);
attributeNameCache.put(nameString, name);
}
} catch (IllegalArgumentException e) {
// new Attributes.Name() throws IllegalArgumentException but we declare IOException
throw new IOException(e.getMessage());
}
return;
}
}
private void readValue() throws IOException {
boolean lastCr = false;
int mark = pos;
int last = pos;
valueBuffer.reset();
while (pos < buf.length) {
byte next = buf[pos++];
switch (next) {
case 0:
throw new IOException("NUL character in a manifest");
case '\n':
if (lastCr) {
lastCr = false;
} else {
consecutiveLineBreaks++;
}
continue;
case '\r':
lastCr = true;
consecutiveLineBreaks++;
continue;
case ' ':
if (consecutiveLineBreaks == 1) {
valueBuffer.write(buf, mark, last - mark);
mark = pos;
consecutiveLineBreaks = 0;
continue;
}
}
if (consecutiveLineBreaks >= 1) {
pos--;
break;
}
last = pos;
}
valueBuffer.write(buf, mark, last - mark);
// A bit frustrating that that Charset.forName will be called
// again.
value = valueBuffer.toString(StandardCharsets.UTF_8.name());
}
}
|
