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
|
/*
* Copyright 2018 - 2022 Anton Tananaev (anton@traccar.org)
* Copyright 2018 Andrey Kunitsyn (andrey@traccar.org)
*
* 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 org.traccar.helper;
import java.nio.charset.StandardCharsets;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.Unpooled;
public final class BufferUtil {
private BufferUtil() {
}
public static int readSignedMagnitudeInt(ByteBuf buffer) {
long value = buffer.readUnsignedInt();
int result = (int) BitUtil.to(value, 31);
return BitUtil.check(value, 31) ? -result : result;
}
public static int indexOf(ByteBuf buffer, int fromIndex, int toIndex, byte value, int count) {
int startIndex = fromIndex;
for (int i = 0; i < count; i++) {
int result = buffer.indexOf(startIndex, toIndex, value);
if (result < 0 || i == count - 1) {
return result;
}
startIndex = result + 1;
}
return -1;
}
public static int indexOf(String needle, ByteBuf haystack) {
return indexOf(needle, haystack, haystack.readerIndex(), haystack.writerIndex());
}
public static int indexOf(String needle, ByteBuf haystack, int startIndex, int endIndex) {
ByteBuf wrappedNeedle = Unpooled.wrappedBuffer(needle.getBytes(StandardCharsets.US_ASCII));
try {
return indexOf(wrappedNeedle, haystack, startIndex, endIndex);
} finally {
wrappedNeedle.release();
}
}
public static int indexOf(ByteBuf needle, ByteBuf haystack, int startIndex, int endIndex) {
int originalReaderIndex = haystack.readerIndex();
int originalWriterIndex = haystack.writerIndex();
try {
haystack.readerIndex(startIndex);
haystack.writerIndex(endIndex);
return ByteBufUtil.indexOf(needle, haystack);
} finally {
haystack.readerIndex(originalReaderIndex);
haystack.writerIndex(originalWriterIndex);
}
}
public static boolean isPrintable(ByteBuf buf, int length) {
boolean printable = true;
for (int i = 0; i < length; i++) {
byte b = buf.getByte(buf.readerIndex() + i);
if (b < 32 && b != '\r' && b != '\n') {
printable = false;
break;
}
}
return printable;
}
public static String readString(ByteBuf buf, int length) {
return buf.readCharSequence(length, StandardCharsets.US_ASCII).toString();
}
}
|
