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1
2 package ch.ethz.ssh2.packets;
3
4 import java.io.UnsupportedEncodingException  ;
5 import java.math.BigInteger ;
6
7
13 public class TypesWriter
14 {
15 byte arr[];
16 int pos;
17
18 public TypesWriter()
19 {
20 arr = new byte[256];
21 pos = 0;
22 }
23
24 private void resize(int len)
25 {
26 byte new_arr[] = new byte[len];
27 System.arraycopy(arr, 0, new_arr, 0, arr.length);
28 arr = new_arr;
29 }
30
31 public int length()
32 {
33 return pos;
34 }
35
36 public byte[] getBytes()
37 {
38 byte[] dst = new byte[pos];
39 System.arraycopy(arr, 0, dst, 0, pos);
40 return dst;
41 }
42
43 public void getBytes(byte dst[])
44 {
45 System.arraycopy(arr, 0, dst, 0, pos);
46 }
47
48 public void writeUINT32(int val, int off)
49 {
50 if ((off + 4) > arr.length)
51 resize(off + 32);
52
53 arr[off++] = (byte) (val >> 24);
54 arr[off++] = (byte) (val >> 16);
55 arr[off++] = (byte) (val >> 8);
56 arr[off++] = (byte) val;
57 }
58
59 public void writeUINT32(int val)
60 {
61 writeUINT32(val, pos);
62 pos += 4;
63 }
64
65 public void writeUINT64(long val)
66 {
67 if ((pos + 8) > arr.length)
68 resize(arr.length + 32);
69
70 arr[pos++] = (byte) (val >> 56);
71 arr[pos++] = (byte) (val >> 48);
72 arr[pos++] = (byte) (val >> 40);
73 arr[pos++] = (byte) (val >> 32);
74 arr[pos++] = (byte) (val >> 24);
75 arr[pos++] = (byte) (val >> 16);
76 arr[pos++] = (byte) (val >> 8);
77 arr[pos++] = (byte) val;
78 }
79
80 public void writeBoolean(boolean v)
81 {
82 if ((pos + 1) > arr.length)
83 resize(arr.length + 32);
84
85 arr[pos++] = v ? (byte) 1 : (byte) 0;
86 }
87
88 public void writeByte(int v, int off)
89 {
90 if ((off + 1) > arr.length)
91 resize(off + 32);
92
93 arr[off] = (byte) v;
94 }
95
96 public void writeByte(int v)
97 {
98 writeByte(v, pos);
99 pos++;
100 }
101
102 public void writeMPInt(BigInteger b)
103 {
104 byte raw[] = b.toByteArray();
105
106 if ((raw.length == 1) && (raw[0] == 0))
107 writeUINT32(0);
108 else
109 writeString(raw, 0, raw.length);
110 }
111
112 public void writeBytes(byte[] buff)
113 {
114 writeBytes(buff, 0, buff.length);
115 }
116
117 public void writeBytes(byte[] buff, int off, int len)
118 {
119 if ((pos + len) > arr.length)
120 resize(arr.length + len + 32);
121
122 System.arraycopy(buff, off, arr, pos, len);
123 pos += len;
124 }
125
126 public void writeString(byte[] buff, int off, int len)
127 {
128 writeUINT32(len);
129 writeBytes(buff, off, len);
130 }
131
132 public void writeString(String v)
133 {
134 byte[] b = v.getBytes();
135
136 writeUINT32(b.length);
137 writeBytes(b, 0, b.length);
138 }
139
140 public void writeString(String v, String charsetName) throws UnsupportedEncodingException
141 {
142 byte[] b = (charsetName == null) ? v.getBytes() : v.getBytes(charsetName);
143
144 writeUINT32(b.length);
145 writeBytes(b, 0, b.length);
146 }
147
148 public void writeNameList(String v[])
149 {
150 StringBuffer sb = new StringBuffer ();
151 for (int i = 0; i < v.length; i++)
152 {
153 if (i > 0)
154 sb.append(',');
155 sb.append(v[i]);
156 }
157 writeString(sb.toString());
158 }
159 }
160 |
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