Mercurial > cgi-bin > hgweb.cgi > JpegWasher

annotate lib/mod/src/de/masters_of_disaster/ant/tasks/ar/ArUtils.java @ 33:3d86f0391168

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Work on improving the build system.
author David Barts <davidb@stashtea.com>
date Fri, 24 Apr 2020 19:45:57 -0700
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33
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1 package de.masters_of_disaster.ant.tasks.ar;
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2
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3 /**
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4 * This class provides static utility methods to work with byte streams.
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5 */
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6 public class ArUtils {
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7 /**
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8 * Parse an octal string from a header buffer. This is used for the
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9 * file permission mode value.
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10 *
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11 * @param header The header buffer from which to parse.
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12 * @param offset The offset into the buffer from which to parse.
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13 * @param length The number of header bytes to parse.
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14 * @return The long value of the octal string.
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15 */
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16 public static long parseOctal(byte[] header, int offset, int length) {
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17 long result = 0;
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18 int end = offset + length;
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19
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20 for (int i=offset ; i<end ; i++) {
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21 if (header[i] == (byte) ' ') {
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22 break;
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23 }
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24 result = (result << 3) + (header[i] - '0');
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25 }
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26
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27 return result;
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28 }
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29
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30 /**
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31 * Parse an entry name from a header buffer.
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32 *
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33 * @param header The header buffer from which to parse.
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34 * @param offset The offset into the buffer from which to parse.
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35 * @param length The number of header bytes to parse.
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36 * @return The header's entry name.
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37 */
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38 public static StringBuffer parseName(byte[] header, int offset, int length) {
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39 StringBuffer result = new StringBuffer(length);
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40 int end = offset + length;
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41
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42 for (int i=offset ; i<end ; i++) {
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43 if (header[i] == ' ') {
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44 break;
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45 }
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46
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47 result.append((char) header[i]);
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48 }
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49
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50 return result;
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51 }
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52
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53 /**
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54 * Write a name into a byte array.
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55 *
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56 * @param name The name to write.
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57 * @param buf The byte array into which to write.
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58 * @param offset The offset into the buffer from which to write.
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59 * @param length The number of header bytes to write.
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60 * @return The number of bytes written to the buffer.
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61 */
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62 public static int getNameBytes(StringBuffer name, byte[] buf, int offset, int length) {
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63 int i;
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64 int c = name.length();
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65
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66 for (i=0 ; i<length && i<c ; i++) {
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67 buf[offset+i] = (byte) name.charAt(i);
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68 }
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69
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70 while (i<length) {
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71 buf[offset+i] = (byte) ' ';
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72 i++;
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73 }
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74
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75 return offset + length;
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76 }
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77
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78 /**
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79 * Write a long value into a byte array.
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80 *
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81 * @param value The value to write.
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82 * @param buf The byte array into which to write.
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83 * @param offset The offset into the buffer from which to write.
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84 * @param length The number of header bytes to write.
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85 * @return The number of bytes written to the buffer.
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86 */
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87 public static int getLongBytes(long value, byte[] buf, int offset, int length) {
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88 int i;
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89 String tmp = Long.toString(value);
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90 int c = tmp.length();
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91
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92 for (i=0 ; i<length && i<c ; i++) {
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93 buf[offset+i] = (byte) tmp.charAt(i);
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94 }
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95
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96 while (i<length) {
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97 buf[offset+i] = (byte) ' ';
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98 i++;
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99 }
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100
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101 return offset + length;
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102 }
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103
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104 /**
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105 * Write an int value into a byte array.
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106 *
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107 * @param value The value to write.
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108 * @param buf The byte array into which to write.
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109 * @param offset The offset into the buffer from which to write.
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110 * @param length The number of header bytes to write.
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111 * @return The number of bytes written to the buffer.
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112 */
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113 public static int getIntegerBytes(int value, byte[] buf, int offset, int length) {
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114 int i;
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115 String tmp = Integer.toString(value);
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116 int c = tmp.length();
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117
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118 for (i=0 ; i<length && i<c ; i++) {
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119 buf[offset+i] = (byte) tmp.charAt(i);
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120 }
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121
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122 while (i<length) {
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123 buf[offset+i] = (byte) ' ';
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124 i++;
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125 }
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126
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127 return offset + length;
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128 }
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129
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130 /**
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131 * Write an octal value into a byte array.
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132 *
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133 * @param value The value to write.
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134 * @param buf The byte array into which to write.
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135 * @param offset The offset into the buffer from which to write.
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136 * @param length The number of header bytes to write.
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137 * @return The number of bytes written to the buffer.
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138 */
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139 public static int getOctalBytes(long value, byte[] buf, int offset, int length) {
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140 int i;
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141 String tmp = Long.toOctalString(value);
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142 int c = tmp.length();
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143
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144 for (i=0 ; i<length && i<c ; i++) {
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145 buf[offset+i] = (byte) tmp.charAt(i);
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146 }
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147
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148 while (i<length) {
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149 buf[offset+i] = (byte) ' ';
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150 i++;
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151 }
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152
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153 return offset + length;
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154 }
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155 }