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comparison app/src/main/java/ch/ethz/ssh2/packets/TypesReader.java @ 438:d29cce60f393

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migrate from Eclipse to Android Studio
author Carl Byington <carl@five-ten-sg.com>
date Thu, 03 Dec 2015 11:23:55 -0800
parents src/ch/ethz/ssh2/packets/TypesReader.java@071eccdff8ea
children
comparison
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437:208b31032318 438:d29cce60f393
1 /*
2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
3 * Please refer to the LICENSE.txt for licensing details.
4 */
5 package ch.ethz.ssh2.packets;
6
7 import java.io.IOException;
8 import java.math.BigInteger;
9
10 import ch.ethz.ssh2.PacketFormatException;
11 import ch.ethz.ssh2.util.StringEncoder;
12
13 /**
14 * @author Christian Plattner
15 * @version $Id: TypesReader.java 160 2014-05-01 14:30:26Z dkocher@sudo.ch $
16 */
17 public final class TypesReader {
18 byte[] arr;
19 int pos = 0;
20 int max = 0;
21
22 public TypesReader(byte[] arr) {
23 this.arr = arr;
24 pos = 0;
25 max = arr.length;
26 }
27
28 public TypesReader(byte[] arr, int off) {
29 this.arr = arr;
30 this.pos = off;
31 this.max = arr.length;
32
33 if ((pos < 0) || (pos > arr.length)) {
34 throw new IllegalArgumentException("Illegal offset.");
35 }
36 }
37
38 public TypesReader(byte[] arr, int off, int len) {
39 this.arr = arr;
40 this.pos = off;
41 this.max = off + len;
42
43 if ((pos < 0) || (pos > arr.length)) {
44 throw new IllegalArgumentException("Illegal offset.");
45 }
46
47 if ((max < 0) || (max > arr.length)) {
48 throw new IllegalArgumentException("Illegal length.");
49 }
50 }
51
52 public int readByte() throws IOException {
53 if (pos >= max) {
54 throw new PacketFormatException("Packet too short.");
55 }
56
57 return (arr[pos++] & 0xff);
58 }
59
60 public byte[] readBytes(int len) throws IOException {
61 if ((pos + len) > max) {
62 throw new PacketFormatException("Packet too short.");
63 }
64
65 byte[] res = new byte[len];
66 System.arraycopy(arr, pos, res, 0, len);
67 pos += len;
68 return res;
69 }
70
71 public void readBytes(byte[] dst, int off, int len) throws IOException {
72 if ((pos + len) > max) {
73 throw new PacketFormatException("Packet too short.");
74 }
75
76 System.arraycopy(arr, pos, dst, off, len);
77 pos += len;
78 }
79
80 public boolean readBoolean() throws IOException {
81 if (pos >= max) {
82 throw new PacketFormatException("Packet too short.");
83 }
84
85 return (arr[pos++] != 0);
86 }
87
88 public int readUINT32() throws IOException {
89 if ((pos + 4) > max) {
90 throw new PacketFormatException("Packet too short.");
91 }
92
93 return ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
94 | (arr[pos++] & 0xff);
95 }
96
97 public long readUINT64() throws IOException {
98 if ((pos + 8) > max) {
99 throw new PacketFormatException("Packet too short.");
100 }
101
102 long high = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
103 | (arr[pos++] & 0xff); /* sign extension may take place - will be shifted away =) */
104 long low = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
105 | (arr[pos++] & 0xff); /* sign extension may take place - handle below */
106 return (high << 32) | (low & 0xffffffffl); /* see Java language spec (15.22.1, 5.6.2) */
107 }
108
109 public BigInteger readMPINT() throws IOException {
110 BigInteger b;
111 byte raw[] = readByteString();
112
113 if (raw.length == 0) {
114 b = BigInteger.ZERO;
115 }
116 else {
117 b = new BigInteger(raw);
118 }
119
120 return b;
121 }
122
123 public byte[] readByteString() throws IOException {
124 int len = readUINT32();
125
126 if ((len + pos) > max) {
127 throw new PacketFormatException("Malformed SSH byte string.");
128 }
129
130 byte[] res = new byte[len];
131 System.arraycopy(arr, pos, res, 0, len);
132 pos += len;
133 return res;
134 }
135
136 public String readString(String charsetName) throws IOException {
137 int len = readUINT32();
138
139 if ((len + pos) > max) {
140 throw new PacketFormatException("Malformed SSH string.");
141 }
142
143 String res = (charsetName == null) ? new String(arr, pos, len) : new String(arr, pos, len, charsetName);
144 pos += len;
145 return res;
146 }
147
148 public String readString() throws IOException {
149 int len = readUINT32();
150
151 if ((len + pos) > max) {
152 throw new PacketFormatException("Malformed SSH string.");
153 }
154
155 String res = StringEncoder.GetString(arr, pos, len);
156 pos += len;
157 return res;
158 }
159
160 public String[] readNameList() throws IOException {
161 return readString().split(",");
162 }
163
164 public int remain() {
165 return max - pos;
166 }
167
168 }