Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/StoragePathHelper.java @ 176:a8df7162ec75

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Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents bb1d02f9eff6
children a415fe296a50
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.util.Arrays;
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20 import java.util.TreeSet;
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21
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22 import org.tmatesoft.hg.util.PathRewrite;
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23
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24 /**
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25 * @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
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26 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 class StoragePathHelper implements PathRewrite {
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32
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33 private final boolean store;
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34 private final boolean fncache;
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35 private final boolean dotencode;
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36
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37 public StoragePathHelper(boolean isStore, boolean isFncache, boolean isDotencode) {
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38 store = isStore;
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39 fncache = isFncache;
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40 dotencode = isDotencode;
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41 }
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42
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43 // FIXME document what path argument is, whether it includes .i or .d, and whether it's 'normalized' (slashes) or not.
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44 // since .hg/store keeps both .i files and files without extension (e.g. fncache), guees, for data == false
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45 // we shall assume path has extension
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46 public String rewrite(String path) {
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47 final String STR_STORE = "store/";
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48 final String STR_DATA = "data/";
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49 final String STR_DH = "dh/";
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50 final String reservedChars = "\\:*?\"<>|";
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51 char[] hexByte = new char[2];
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52
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53 path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
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54 StringBuilder sb = new StringBuilder(path.length() << 1);
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55 if (store || fncache) {
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56 // encodefilename
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57 for (int i = 0; i < path.length(); i++) {
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58 final char ch = path.charAt(i);
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59 if (ch >= 'a' && ch <= 'z') {
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60 sb.append(ch); // POIRAE
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61 } else if (ch >= 'A' && ch <= 'Z') {
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62 sb.append('_');
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63 sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20?
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64 } else if (reservedChars.indexOf(ch) != -1) {
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65 sb.append('~');
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66 sb.append(toHexByte(ch, hexByte));
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67 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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68 sb.append('~');
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69 sb.append(toHexByte(ch, hexByte));
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70 } else if (ch == '_') {
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71 sb.append('_');
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72 sb.append('_');
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73 } else {
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74 sb.append(ch);
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75 }
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76 }
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77 // auxencode
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78 if (fncache) {
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79 encodeWindowsDeviceNames(sb);
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80 }
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81 }
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82 final int MAX_PATH_LEN = 120;
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83 if (fncache && (sb.length() + STR_DATA.length() + ".i".length() > MAX_PATH_LEN)) {
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84 String digest = new DigestHelper().sha1(STR_DATA, path, ".i").asHexString();
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85 final int DIR_PREFIX_LEN = 8;
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86 // not sure why (-4) is here. 120 - 40 = up to 80 for path with ext. dh/ + ext(.i) = 3+2
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87 final int MAX_DIR_PREFIX = 8 * (DIR_PREFIX_LEN + 1) - 4;
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88 sb = new StringBuilder(MAX_PATH_LEN);
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89 for (int i = 0; i < path.length(); i++) {
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90 final char ch = path.charAt(i);
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91 if (ch >= 'a' && ch <= 'z') {
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92 sb.append(ch);
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93 } else if (ch >= 'A' && ch <= 'Z') {
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94 sb.append((char) (ch | 0x20)); // lowercase
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95 } else if (reservedChars.indexOf(ch) != -1) {
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96 sb.append('~');
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97 sb.append(toHexByte(ch, hexByte));
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98 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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99 sb.append('~');
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100 sb.append(toHexByte(ch, hexByte));
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101 } else {
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102 sb.append(ch);
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103 }
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104 }
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105 encodeWindowsDeviceNames(sb);
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106 int fnameStart = sb.lastIndexOf("/"); // since we rewrite file names, it never ends with slash (for dirs, I'd pass length-2);
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107 StringBuilder completeHashName = new StringBuilder(MAX_PATH_LEN);
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108 completeHashName.append(STR_STORE);
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109 completeHashName.append(STR_DH);
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110 if (fnameStart == -1) {
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111 // no dirs, just long filename
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112 sb.setLength(MAX_PATH_LEN - 40 /*digest.length()*/ - STR_DH.length() - ".i".length());
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113 completeHashName.append(sb);
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114 } else {
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115 StringBuilder sb2 = new StringBuilder(MAX_PATH_LEN);
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116 int x = 0;
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117 do {
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118 int i = sb.indexOf("/", x);
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119 final int sb2Len = sb2.length();
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120 if (i-x <= DIR_PREFIX_LEN) { // a b c d e f g h /
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121 sb2.append(sb, x, i + 1); // with slash
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122 } else {
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123 sb2.append(sb, x, x + DIR_PREFIX_LEN);
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124 // may unexpectedly end with bad character
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125 final int last = sb2.length()-1;
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126 char lastChar = sb2.charAt(last);
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127 assert lastChar == sb.charAt(x + DIR_PREFIX_LEN - 1);
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128 if (lastChar == '.' || lastChar == ' ') {
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129 sb2.setCharAt(last, '_');
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130 }
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131 sb2.append('/');
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132 }
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133 if (sb2.length()-1 > MAX_DIR_PREFIX) {
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134 sb2.setLength(sb2Len); // strip off last segment, it's too much
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135 break;
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136 }
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137 x = i+1;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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138 } while (x < fnameStart);
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139 assert sb2.charAt(sb2.length() - 1) == '/';
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140 int left = MAX_PATH_LEN - sb2.length() - 40 /*digest.length()*/ - STR_DH.length() - ".i".length();
a5275143664c Complete path hash calculation of fncache requirement
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141 assert left >= 0;
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142 fnameStart++; // move from / to actual name
a5275143664c Complete path hash calculation of fncache requirement
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143 sb2.append(sb, fnameStart, fnameStart + left > sb.length() ? sb.length() : fnameStart+left);
a5275143664c Complete path hash calculation of fncache requirement
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144 completeHashName.append(sb2);
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145 }
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146 completeHashName.append(digest);
a5275143664c Complete path hash calculation of fncache requirement
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147 sb = completeHashName;
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148 } else if (store) {
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149 sb.insert(0, STR_STORE + STR_DATA);
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150 }
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151 sb.append(".i");
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152 return sb.toString();
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153 }
83
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154
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155 private void encodeWindowsDeviceNames(StringBuilder sb) {
a5275143664c Complete path hash calculation of fncache requirement
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156 char[] hexByte = new char[2];
a5275143664c Complete path hash calculation of fncache requirement
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157 int x = 0; // last segment start
a5275143664c Complete path hash calculation of fncache requirement
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158 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
a5275143664c Complete path hash calculation of fncache requirement
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159 windowsReservedFilenames.addAll(Arrays.asList("con prn aux nul com1 com2 com3 com4 com5 com6 com7 com8 com9 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9".split(" ")));
a5275143664c Complete path hash calculation of fncache requirement
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160 do {
a5275143664c Complete path hash calculation of fncache requirement
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161 int i = sb.indexOf("/", x);
a5275143664c Complete path hash calculation of fncache requirement
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162 if (i == -1) {
a5275143664c Complete path hash calculation of fncache requirement
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163 i = sb.length();
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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164 }
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parents: 80
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165 // windows reserved filenames are at least of length 3
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parents: 80
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166 if (i - x >= 3) {
a5275143664c Complete path hash calculation of fncache requirement
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167 boolean found = false;
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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168 if (i-x == 3 || i-x == 4) {
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parents: 80
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169 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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170 } else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
171 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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172 } else if (i-x > 4 && sb.charAt(x+4) == '.') {
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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173 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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174 }
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parents: 80
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175 if (found) {
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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176 sb.insert(x+3, toHexByte(sb.charAt(x+2), hexByte));
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
177 sb.setCharAt(x+2, '~');
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178 i += 2;
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179 }
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180 }
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parents: 80
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181 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
182 sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
183 sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
184 i += 2;
a5275143664c Complete path hash calculation of fncache requirement
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185 }
a5275143664c Complete path hash calculation of fncache requirement
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186 x = i+1;
a5275143664c Complete path hash calculation of fncache requirement
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187 } while (x < sb.length());
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
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188 }
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189
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190 private static char[] toHexByte(int ch, char[] buf) {
6f1b88693d48 Complete refactoring to org.tmatesoft
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parents:
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191 assert buf.length > 1;
6f1b88693d48 Complete refactoring to org.tmatesoft
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192 final String hexDigits = "0123456789abcdef";
6f1b88693d48 Complete refactoring to org.tmatesoft
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193 buf[0] = hexDigits.charAt((ch & 0x00F0) >>> 4);
6f1b88693d48 Complete refactoring to org.tmatesoft
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194 buf[1] = hexDigits.charAt(ch & 0x0F);
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195 return buf;
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196 }
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197 }