annotate app/src/main/java/org/tn5250j/framework/tn5250/Stream5250.java @ 507:f7498bd7621b

Added tag stable-1.9.4-5 for changeset b8cc360e1550
author Carl Byington <carl@five-ten-sg.com>
date Wed, 16 Nov 2022 12:07:04 -0700
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1 /**
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2 * Title: tn5250J
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3 * Copyright: Copyright (c) 2001
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4 * Company:
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5 * @author Kenneth J. Pouncey
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6 * @version 0.4
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7 *
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8 * Description:
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9 *
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10 * This program is free software; you can redistribute it and/or modify
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11 * it under the terms of the GNU General Public License as published by
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12 * the Free Software Foundation; either version 2, or (at your option)
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13 * any later version.
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14 *
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15 * This program is distributed in the hope that it will be useful,
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16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 * GNU General Public License for more details.
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19 *
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20 * You should have received a copy of the GNU General Public License
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21 * along with this software; see the file COPYING. If not, write to
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22 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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23 * Boston, MA 02111-1307 USA
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24 *
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25 */
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26 package org.tn5250j.framework.tn5250;
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27
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28 public class Stream5250 {
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29 public static final int OPCODE_OFFSET = 9;
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30
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31 public int streamSize;
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32 public int opCode;
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33 public int dataStart;
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34 public int pos;
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35 public byte buffer[];
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36
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37 public Stream5250(byte abyte0[]) {
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38 buffer = abyte0;
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39 // size without end of record 0xFF 0xEF
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40 streamSize = (abyte0[0] & 0xff) << 8 | abyte0[1] & 0xff;
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41 opCode = abyte0[9];
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42 dataStart = 6 + abyte0[6];
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43 pos = dataStart;
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44 }
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45
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46 public Stream5250() {
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47 buffer = null;
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48 streamSize = 0;
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49 opCode = 0;
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50 dataStart = 0;
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51 pos = dataStart;
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52 }
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53
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54 /**
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55 * This method takes a byte array and initializes the object information
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56 * to be used.
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57 *
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58 * @param abyte0
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59 */
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60 public void initialize(byte abyte0[]) {
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61 buffer = abyte0;
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62 // size without end of record 0xFF 0xEF
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63 streamSize = (abyte0[0] & 0xff) << 8 | abyte0[1] & 0xff;
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64 opCode = abyte0[OPCODE_OFFSET];
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65 dataStart = 6 + abyte0[6];
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66 pos = dataStart;
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67 }
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68
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69 public final int getOpCode() {
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70 return opCode;
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71 }
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72
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73 public final byte getNextByte()
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74 throws Exception {
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75 if (buffer == null || pos > buffer.length)
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76 throw new Exception("Buffer length exceeded: " + pos);
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77 else
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78 return buffer[pos++];
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79 }
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80
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81 public final void setPrevByte()
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82 throws Exception {
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83 if (pos == 0) {
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84 throw new Exception("Index equals zero.");
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85 }
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86 else {
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87 pos--;
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88 return;
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89 }
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90 }
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91
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92 /**
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93 * Returns where we are in the buffer
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94 * @return position in the buffer
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95 */
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96 public final int getCurrentPos() {
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97 return pos;
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98 }
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99
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100 public final byte getByteOffset(int off)
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101 throws Exception {
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102 if (buffer == null || (pos + off) > buffer.length)
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103 throw new Exception("Buffer length exceeded: " + pos);
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104 else
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105 return buffer[pos + off];
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106 }
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107
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108 public final boolean size() {
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109 return pos >= streamSize;
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110 }
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112
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113 /**
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114 * Determines if any more bytes are available in the buffer to be processed.
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115 * @return yes or no
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116 */
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117 public final boolean hasNext() {
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118 // return pos >= buffer.length;
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119 return pos < streamSize;
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120 }
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121
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122 /**
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123 * This routine will retrieve a segment based on the first two bytes being
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124 * the length of the segment.
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125 *
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126 * @return a new byte array containing the bytes of the segment.
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127 * @throws Exception
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128 */
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129 public final byte[] getSegment() throws Exception {
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130 // The first two bytes contain the length of the segment.
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131 int length = ((buffer[pos] & 0xff) << 8 | (buffer[pos + 1] & 0xff));
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132 // allocate space for it.
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133 byte[] segment = new byte[length];
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134 getSegment(segment, length, true);
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135 return segment;
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136 }
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138
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139 /**
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140 * This routine will retrieve a byte array based on the first two bytes being
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141 * the length of the segment.
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142 *
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143 * @param segment - byte array
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144 * @param length - length of segment to return
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145 * @param adjustPos - adjust the position of the buffer to the end of the seg
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146 * ment
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147 * @throws Exception
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148 */
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149 public final void getSegment(byte[] segment, int length, boolean adjustPos)
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150 throws Exception {
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151 // If the length is larger than what is available throw an exception
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152 if ((pos + length) > buffer.length)
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153 throw new Exception("Buffer length exceeded: start " + pos
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154 + " length " + length);
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155
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156 // use the system array copy to move the bytes from the buffer
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157 // to the allocated byte array
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158 System.arraycopy(buffer, pos, segment, 0, length);
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159
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160 // update the offset to be after the segment so the next byte can be read
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161 if (adjustPos)
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162 pos += length;
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163 }
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164
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165 }