blob: 2f4e2eee7bca6c19c9301ea648fbec3a8802f405 (
plain)
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
|
/*******************************************************************************
* Copyright (c) 2009, 2021 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.data;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Additional data input methods for compact storage of data structures.
*
* @see CompactDataOutput
*/
public class CompactDataInput extends DataInputStream {
/**
* Creates a new {@link CompactDataInput} that uses the specified underlying
* input stream.
*
* @param in
* underlying input stream
*/
public CompactDataInput(final InputStream in) {
super(in);
}
/**
* Reads a variable length representation of an integer value.
*
* @return read value
* @throws IOException
* if thrown by the underlying stream
*/
public int readVarInt() throws IOException {
final int value = 0xFF & readByte();
if ((value & 0x80) == 0) {
return value;
}
return (value & 0x7F) | (readVarInt() << 7);
}
/**
* Reads a boolean array.
*
* @return boolean array
* @throws IOException
* if thrown by the underlying stream
*/
public boolean[] readBooleanArray() throws IOException {
final boolean[] value = new boolean[readVarInt()];
int buffer = 0;
for (int i = 0; i < value.length; i++) {
if ((i % 8) == 0) {
buffer = readByte();
}
value[i] = (buffer & 0x01) != 0;
buffer >>>= 1;
}
return value;
}
}
|
