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
|
/*
* Copyright 2011 Vaadin Ltd.
*
* Licensed 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 com.vaadin.sass.util;
import java.io.InputStream;
import java.io.OutputStream;
/**
* ByteArrayOutputStream implementation that doesn't synchronize methods and
* doesn't copy the data on toByteArray().
*/
public class FastByteArrayOutputStream extends OutputStream {
/**
* Buffer and size
*/
protected byte[] buf = null;
protected int size = 0;
/**
* Constructs a stream with buffer capacity size 5K
*/
public FastByteArrayOutputStream() {
this(5 * 1024);
}
/**
* Constructs a stream with the given initial size
*/
public FastByteArrayOutputStream(int initSize) {
size = 0;
buf = new byte[initSize];
}
/**
* Ensures that we have a large enough buffer for the given size.
*/
private void verifyBufferSize(int sz) {
if (sz > buf.length) {
byte[] old = buf;
buf = new byte[Math.max(sz, 2 * buf.length)];
System.arraycopy(old, 0, buf, 0, old.length);
old = null;
}
}
public int getSize() {
return size;
}
/**
* Returns the byte array containing the written data. Note that this array
* will almost always be larger than the amount of data actually written.
*/
public byte[] getByteArray() {
return buf;
}
@Override
public final void write(byte b[]) {
verifyBufferSize(size + b.length);
System.arraycopy(b, 0, buf, size, b.length);
size += b.length;
}
@Override
public final void write(byte b[], int off, int len) {
verifyBufferSize(size + len);
System.arraycopy(b, off, buf, size, len);
size += len;
}
@Override
public final void write(int b) {
verifyBufferSize(size + 1);
buf[size++] = (byte) b;
}
public void reset() {
size = 0;
}
/**
* Returns a ByteArrayInputStream for reading back the written data
*/
public InputStream getInputStream() {
return new FastByteArrayInputStream(buf, size);
}
}
|
