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comparison src/com/trilead/ssh2/packets/TypesReader.java @ 0:0ce5cc452d02

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initial version
author Carl Byington <carl@five-ten-sg.com>
date Thu, 22 May 2014 10:41:19 -0700
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-1:000000000000 0:0ce5cc452d02
1
2 package com.trilead.ssh2.packets;
3
4 import java.io.IOException;
5 import java.math.BigInteger;
6
7 import com.trilead.ssh2.util.Tokenizer;
8
9
10 /**
11 * TypesReader.
12 *
13 * @author Christian Plattner, plattner@trilead.com
14 * @version $Id: TypesReader.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
15 */
16 public class TypesReader {
17 byte[] arr;
18 int pos = 0;
19 int max = 0;
20
21 public TypesReader(byte[] arr) {
22 this.arr = arr;
23 pos = 0;
24 max = arr.length;
25 }
26
27 public TypesReader(byte[] arr, int off) {
28 this.arr = arr;
29 this.pos = off;
30 this.max = arr.length;
31
32 if ((pos < 0) || (pos > arr.length))
33 throw new IllegalArgumentException("Illegal offset.");
34 }
35
36 public TypesReader(byte[] arr, int off, int len) {
37 this.arr = arr;
38 this.pos = off;
39 this.max = off + len;
40
41 if ((pos < 0) || (pos > arr.length))
42 throw new IllegalArgumentException("Illegal offset.");
43
44 if ((max < 0) || (max > arr.length))
45 throw new IllegalArgumentException("Illegal length.");
46 }
47
48 public int readByte() throws IOException {
49 if (pos >= max)
50 throw new IOException("Packet too short.");
51
52 return (arr[pos++] & 0xff);
53 }
54
55 public byte[] readBytes(int len) throws IOException {
56 if ((pos + len) > max)
57 throw new IOException("Packet too short.");
58
59 byte[] res = new byte[len];
60 System.arraycopy(arr, pos, res, 0, len);
61 pos += len;
62 return res;
63 }
64
65 public void readBytes(byte[] dst, int off, int len) throws IOException {
66 if ((pos + len) > max)
67 throw new IOException("Packet too short.");
68
69 System.arraycopy(arr, pos, dst, off, len);
70 pos += len;
71 }
72
73 public boolean readBoolean() throws IOException {
74 if (pos >= max)
75 throw new IOException("Packet too short.");
76
77 return (arr[pos++] != 0);
78 }
79
80 public int readUINT32() throws IOException {
81 if ((pos + 4) > max)
82 throw new IOException("Packet too short.");
83
84 return ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
85 | (arr[pos++] & 0xff);
86 }
87
88 public long readUINT64() throws IOException {
89 if ((pos + 8) > max)
90 throw new IOException("Packet too short.");
91
92 long high = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
93 | (arr[pos++] & 0xff); /* sign extension may take place - will be shifted away =) */
94 long low = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8)
95 | (arr[pos++] & 0xff); /* sign extension may take place - handle below */
96 return (high << 32) | (low & 0xffffffffl); /* see Java language spec (15.22.1, 5.6.2) */
97 }
98
99 public BigInteger readMPINT() throws IOException {
100 BigInteger b;
101 byte raw[] = readByteString();
102
103 if (raw.length == 0)
104 b = BigInteger.ZERO;
105 else
106 b = new BigInteger(raw);
107
108 return b;
109 }
110
111 public byte[] readByteString() throws IOException {
112 int len = readUINT32();
113
114 if ((len + pos) > max)
115 throw new IOException("Malformed SSH byte string.");
116
117 byte[] res = new byte[len];
118 System.arraycopy(arr, pos, res, 0, len);
119 pos += len;
120 return res;
121 }
122
123 public String readString(String charsetName) throws IOException {
124 int len = readUINT32();
125
126 if ((len + pos) > max)
127 throw new IOException("Malformed SSH string.");
128
129 String res = (charsetName == null) ? new String(arr, pos, len) : new String(arr, pos, len, charsetName);
130 pos += len;
131 return res;
132 }
133
134 public String readString() throws IOException {
135 int len = readUINT32();
136
137 if ((len + pos) > max)
138 throw new IOException("Malformed SSH string.");
139
140 String res = new String(arr, pos, len, "ISO-8859-1");
141 pos += len;
142 return res;
143 }
144
145 public String[] readNameList() throws IOException {
146 return Tokenizer.parseTokens(readString(), ',');
147 }
148
149 public int remain() {
150 return max - pos;
151 }
152
153 }