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annotate lib/mod/src/de/masters_of_disaster/ant/tasks/ar/ArEntry.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 import java.io.File;
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4 import java.util.Date;
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5
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6 /**
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7 * This class represents an entry in an Ar archive. It consists
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8 * of the entry's header, as well as the entry's File. Entries
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9 * can be instantiated in one of three ways, depending on how
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10 * they are to be used.
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11 * <p>
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12 * ArEntries that are created from the header bytes read from
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13 * an archive are instantiated with the ArEntry( byte[] )
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14 * constructor. These entries will be used when extracting from
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15 * or listing the contents of an archive. These entries have their
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16 * header filled in using the header bytes. They also set the File
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17 * to null, since they reference an archive entry not a file.
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18 * <p>
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19 * ArEntries that are created from Files that are to be written
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20 * into an archive are instantiated with the ArEntry( File )
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21 * constructor. These entries have their header filled in using
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22 * the File's information. They also keep a reference to the File
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23 * for convenience when writing entries.
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24 * <p>
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25 * Finally, ArEntries can be constructed from nothing but a name.
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26 * This allows the programmer to construct the entry by hand, for
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27 * instance when only an InputStream is available for writing to
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28 * the archive, and the header information is constructed from
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29 * other information. In this case the header fields are set to
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30 * defaults and the File is set to null.
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31 *
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32 * <p>
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33 * The C structure for an Ar Entry's header is:
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34 * <pre>
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35 * struct header {
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36 * char filename[16];
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37 * char filedate[12];
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38 * char uid[6];
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39 * char gid[6];
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40 * char mode[8];
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41 * char size[10];
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42 * char magic[2];
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43 * } header;
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44 * </pre>
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45 *
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46 */
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47
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48 public class ArEntry implements ArConstants {
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49 /** The entry's filename. */
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50 private StringBuffer filename;
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51
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52 /** The entry's file date. */
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53 private long fileDate;
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54
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55 /** The entry's user id. */
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56 private int userId;
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57
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58 /** The entry's group id. */
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59 private int groupId;
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60
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61 /** The entry's permission mode. */
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62 private int mode;
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63
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64 /** The entry's size. */
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65 private long size;
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66
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67 /** The entry's magic tag. */
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68 private StringBuffer magic;
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69
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70 /** The entry's file reference */
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71 private File file;
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72
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73 /** Default permissions bits for files */
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74 public static final int DEFAULT_FILE_MODE = 0100644;
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75
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76 /** Convert millis to seconds */
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77 public static final int MILLIS_PER_SECOND = 1000;
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78
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79 /**
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80 * Construct an empty entry and prepares the header values.
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81 */
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82 private ArEntry () {
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83 this.magic = new StringBuffer(HEADERMAGIC);
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84 this.filename = new StringBuffer();
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85 this.userId = 0;
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86 this.groupId = 0;
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87 this.file = null;
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88 }
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89
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90 /**
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91 * Construct an entry with only a name. This allows the programmer
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92 * to construct the entry's header "by hand". File is set to null.
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93 *
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94 * @param name the entry name
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95 */
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96 public ArEntry(String name) {
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97 this();
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98 if (name.endsWith("/")) {
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99 throw new IllegalArgumentException("ar archives can only contain files");
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100 }
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101 this.filename = new StringBuffer(name);
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102 this.mode = DEFAULT_FILE_MODE;
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103 this.userId = 0;
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104 this.groupId = 0;
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105 this.size = 0;
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106 this.fileDate = (new Date()).getTime() / MILLIS_PER_SECOND;
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107 }
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108
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109 /**
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110 * Construct an entry for a file. File is set to file, and the
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111 * header is constructed from information from the file.
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112 *
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113 * @param file The file that the entry represents.
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114 */
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115 public ArEntry(File file) {
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116 this();
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117 if (file.isDirectory()) {
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118 throw new IllegalArgumentException("ar archives can only contain files");
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119 }
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120 this.file = file;
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121 this.filename = new StringBuffer(file.getName());
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122 this.fileDate = file.lastModified() / MILLIS_PER_SECOND;
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123 this.mode = DEFAULT_FILE_MODE;
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124 this.size = file.length();
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125 }
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126
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127 /**
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128 * Construct an entry from an archive's header bytes. File is set
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129 * to null.
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130 *
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131 * @param headerBuf The header bytes from an ar archive entry.
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132 */
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133 public ArEntry(byte[] headerBuf) {
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134 this();
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135 this.parseArHeader(headerBuf);
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136 }
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137
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138 /**
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139 * Determine if the two entries are equal. Equality is determined
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140 * by the header names being equal.
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141 *
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142 * @param it Entry to be checked for equality.
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143 * @return True if the entries are equal.
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144 */
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145 public boolean equals(ArEntry it) {
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146 return this.getFilename().equals(it.getFilename());
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147 }
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148
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149 /**
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150 * Determine if the two entries are equal. Equality is determined
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151 * by the header names being equal.
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152 *
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153 * @param it Entry to be checked for equality.
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154 * @return True if the entries are equal.
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155 */
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156 public boolean equals(Object it) {
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157 if (it == null || getClass() != it.getClass()) {
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158 return false;
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159 }
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160 return equals((ArEntry) it);
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161 }
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162
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163 /**
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164 * Hashcodes are based on entry names.
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165 *
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166 * @return the entry hashcode
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167 */
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168 public int hashCode() {
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169 return getFilename().hashCode();
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170 }
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171
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172 /**
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173 * Get this entry's name.
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174 *
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175 * @return This entry's name.
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176 */
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177 public String getFilename() {
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178 return this.filename.toString();
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179 }
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180
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181 /**
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182 * Set this entry's name.
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183 *
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184 * @param name This entry's new name.
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185 */
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186 public void setFilename(String filename) {
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187 this.filename = new StringBuffer(filename);
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188 }
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189
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190 /**
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191 * Set the mode for this entry
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192 *
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193 * @param mode the mode for this entry
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194 */
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195 public void setMode(int mode) {
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196 this.mode = mode;
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197 }
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198
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199 /**
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200 * Get this entry's user id.
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201 *
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202 * @return This entry's user id.
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203 */
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204 public int getUserId() {
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205 return this.userId;
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206 }
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207
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208 /**
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209 * Set this entry's user id.
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210 *
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211 * @param userId This entry's new user id.
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212 */
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213 public void setUserId(int userId) {
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214 this.userId = userId;
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215 }
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216
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217 /**
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218 * Get this entry's group id.
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219 *
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220 * @return This entry's group id.
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221 */
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222 public int getGroupId() {
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223 return this.groupId;
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224 }
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225
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226 /**
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227 * Set this entry's group id.
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228 *
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229 * @param groupId This entry's new group id.
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230 */
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231 public void setGroupId(int groupId) {
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232 this.groupId = groupId;
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233 }
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234
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235 /**
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236 * Convenience method to set this entry's group and user ids.
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237 *
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238 * @param userId This entry's new user id.
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239 * @param groupId This entry's new group id.
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240 */
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241 public void setIds(int userId, int groupId) {
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242 this.setUserId(userId);
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243 this.setGroupId(groupId);
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244 }
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245
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246 /**
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247 * Set this entry's modification time. The parameter passed
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248 * to this method is in "Java time".
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249 *
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250 * @param time This entry's new modification time.
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251 */
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252 public void setFileDate(long time) {
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253 this.fileDate = time / MILLIS_PER_SECOND;
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254 }
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255
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256 /**
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257 * Set this entry's modification time.
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258 *
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259 * @param time This entry's new modification time.
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260 */
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261 public void setFileDate(Date time) {
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262 this.fileDate = time.getTime() / MILLIS_PER_SECOND;
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263 }
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264
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265 /**
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266 * Get this entry's modification time.
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267 *
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268 * @return time This entry's new modification time.
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269 */
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270 public Date getFileDate() {
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271 return new Date(this.fileDate * MILLIS_PER_SECOND);
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272 }
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273
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274 /**
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275 * Get this entry's file.
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276 *
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277 * @return This entry's file.
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278 */
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279 public File getFile() {
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280 return this.file;
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281 }
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282
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283 /**
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284 * Get this entry's mode.
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285 *
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286 * @return This entry's mode.
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287 */
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288 public int getMode() {
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289 return this.mode;
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290 }
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291
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292 /**
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293 * Get this entry's file size.
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294 *
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295 * @return This entry's file size.
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296 */
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297 public long getSize() {
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298 return this.size;
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299 }
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300
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301 /**
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302 * Set this entry's file size.
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303 *
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304 * @param size This entry's new file size.
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305 */
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306 public void setSize(long size) {
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307 this.size = size;
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308 }
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309
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310 /**
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311 * Write an entry's header information to a header buffer.
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312 *
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313 * @param outbuf The tar entry header buffer to fill in.
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314 */
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315 public void writeEntryHeader(byte[] outbuf) {
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316 int offset = 0;
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317
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318 offset = ArUtils.getNameBytes(this.filename, outbuf, offset, NAMELEN);
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319 offset = ArUtils.getLongBytes(this.fileDate, outbuf, offset, FILEDATELEN);
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320 offset = ArUtils.getIntegerBytes(this.userId, outbuf, offset, UIDLEN);
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321 offset = ArUtils.getIntegerBytes(this.groupId, outbuf, offset, GIDLEN);
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322 offset = ArUtils.getOctalBytes(this.mode, outbuf, offset, MODELEN);
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323 offset = ArUtils.getLongBytes(this.size, outbuf, offset, SIZELEN);
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324 offset = ArUtils.getNameBytes(this.magic, outbuf, offset, MAGICLEN);
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325
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326 while (offset < outbuf.length) {
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327 outbuf[offset++] = 0;
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328 }
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329 }
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330
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331 /**
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332 * Parse an entry's header information from a header buffer.
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333 *
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334 * @param header The ar entry header buffer to get information from.
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335 */
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336 public void parseArHeader(byte[] header) {
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337 throw new UnsupportedOperationException("parseArHeader(byte[]) not yet implmented");
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338 // int offset = 0;
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339 //
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340 // this.filename = TarUtils.parseName(header, offset, NAMELEN);
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341 // offset += NAMELEN;
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342 // this.fileDate = TarUtils.parseOctal(header, offset, FILEDATELEN);
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343 // offset += FILEDATELEN;
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344 // this.userId = (int) TarUtils.parseOctal(header, offset, UIDLEN);
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345 // offset += UIDLEN;
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346 // this.groupId = (int) TarUtils.parseOctal(header, offset, GIDLEN);
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347 // offset += GIDLEN;
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348 // this.mode = (int) TarUtils.parseOctal(header, offset, MODELEN);
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349 // offset += MODELEN;
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350 // this.size = TarUtils.parseOctal(header, offset, SIZELEN);
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351 // offset += SIZELEN;
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352 // this.magic = TarUtils.parseName(header, offset, MAGICLEN);
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353 // offset += MAGICLEN;
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354 }
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355 }