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2 package com.trilead.ssh2.packets;
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3
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4 import java.io.UnsupportedEncodingException;
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5 import java.math.BigInteger;
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6
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7 /**
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8 * TypesWriter.
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9 *
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10 * @author Christian Plattner, plattner@trilead.com
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11 * @version $Id: TypesWriter.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
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12 */
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13 public class TypesWriter {
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14 byte arr[];
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15 int pos;
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16
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17 public TypesWriter() {
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18 arr = new byte[256];
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19 pos = 0;
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20 }
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21
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22 private void resize(int len) {
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23 byte new_arr[] = new byte[len];
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24 System.arraycopy(arr, 0, new_arr, 0, arr.length);
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25 arr = new_arr;
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26 }
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27
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28 public int length() {
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29 return pos;
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30 }
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31
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32 public byte[] getBytes() {
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33 byte[] dst = new byte[pos];
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34 System.arraycopy(arr, 0, dst, 0, pos);
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35 return dst;
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36 }
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37
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38 public void getBytes(byte dst[]) {
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39 System.arraycopy(arr, 0, dst, 0, pos);
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40 }
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41
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42 public void writeUINT32(int val, int off) {
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43 if ((off + 4) > arr.length)
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44 resize(off + 32);
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45
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46 arr[off++] = (byte)(val >> 24);
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47 arr[off++] = (byte)(val >> 16);
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48 arr[off++] = (byte)(val >> 8);
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49 arr[off++] = (byte) val;
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50 }
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51
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52 public void writeUINT32(int val) {
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53 writeUINT32(val, pos);
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54 pos += 4;
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55 }
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56
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57 public void writeUINT64(long val) {
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58 if ((pos + 8) > arr.length)
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59 resize(arr.length + 32);
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60
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61 arr[pos++] = (byte)(val >> 56);
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62 arr[pos++] = (byte)(val >> 48);
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63 arr[pos++] = (byte)(val >> 40);
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64 arr[pos++] = (byte)(val >> 32);
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65 arr[pos++] = (byte)(val >> 24);
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66 arr[pos++] = (byte)(val >> 16);
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67 arr[pos++] = (byte)(val >> 8);
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68 arr[pos++] = (byte) val;
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69 }
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70
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71 public void writeBoolean(boolean v) {
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72 if ((pos + 1) > arr.length)
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73 resize(arr.length + 32);
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74
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75 arr[pos++] = v ? (byte) 1 : (byte) 0;
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76 }
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77
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78 public void writeByte(int v, int off) {
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79 if ((off + 1) > arr.length)
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80 resize(off + 32);
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81
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82 arr[off] = (byte) v;
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83 }
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84
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85 public void writeByte(int v) {
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86 writeByte(v, pos);
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87 pos++;
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88 }
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89
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90 public void writeMPInt(BigInteger b) {
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91 byte raw[] = b.toByteArray();
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92
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93 if ((raw.length == 1) && (raw[0] == 0))
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94 writeUINT32(0); /* String with zero bytes of data */
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95 else
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96 writeString(raw, 0, raw.length);
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97 }
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98
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99 public void writeBytes(byte[] buff) {
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100 writeBytes(buff, 0, buff.length);
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101 }
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102
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103 public void writeBytes(byte[] buff, int off, int len) {
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104 if ((pos + len) > arr.length)
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105 resize(arr.length + len + 32);
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106
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107 System.arraycopy(buff, off, arr, pos, len);
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108 pos += len;
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109 }
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110
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111 public void writeString(byte[] buff, int off, int len) {
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112 writeUINT32(len);
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113 writeBytes(buff, off, len);
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114 }
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115
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116 public void writeString(String v) {
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117 byte[] b;
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118
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119 try {
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120 /* All Java JVMs must support ISO-8859-1 */
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121 b = v.getBytes("ISO-8859-1");
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122 }
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123 catch (UnsupportedEncodingException ignore) {
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124 b = v.getBytes();
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125 }
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126
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127 writeUINT32(b.length);
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128 writeBytes(b, 0, b.length);
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129 }
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130
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131 public void writeString(String v, String charsetName) throws UnsupportedEncodingException {
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132 byte[] b = (charsetName == null) ? v.getBytes() : v.getBytes(charsetName);
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133 writeUINT32(b.length);
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134 writeBytes(b, 0, b.length);
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135 }
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136
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137 public void writeNameList(String v[]) {
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138 StringBuffer sb = new StringBuffer();
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139
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140 for (int i = 0; i < v.length; i++) {
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141 if (i > 0)
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142 sb.append(',');
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143
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144 sb.append(v[i]);
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145 }
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146
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147 writeString(sb.toString());
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148 }
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149 }
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