Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/StoragePathHelper.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents a415fe296a50
children 6d2c6b2469fc
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 CharSequence rewrite(CharSequence p) {
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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 String path = p.toString();
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54 path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
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55 StringBuilder sb = new StringBuilder(path.length() << 1);
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56 if (store || fncache) {
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57 // encodefilename
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58 for (int i = 0; i < path.length(); i++) {
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59 final char ch = path.charAt(i);
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60 if (ch >= 'a' && ch <= 'z') {
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61 sb.append(ch); // POIRAE
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62 } else if (ch >= 'A' && ch <= 'Z') {
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63 sb.append('_');
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64 sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20?
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65 } else if (reservedChars.indexOf(ch) != -1) {
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66 sb.append('~');
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67 sb.append(toHexByte(ch, hexByte));
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68 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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69 sb.append('~');
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70 sb.append(toHexByte(ch, hexByte));
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71 } else if (ch == '_') {
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72 sb.append('_');
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73 sb.append('_');
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74 } else {
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75 sb.append(ch);
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76 }
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77 }
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78 // auxencode
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79 if (fncache) {
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80 encodeWindowsDeviceNames(sb);
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81 }
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82 }
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83 final int MAX_PATH_LEN = 120;
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84 if (fncache && (sb.length() + STR_DATA.length() + ".i".length() > MAX_PATH_LEN)) {
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85 String digest = new DigestHelper().sha1(STR_DATA, path, ".i").asHexString();
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86 final int DIR_PREFIX_LEN = 8;
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87 // not sure why (-4) is here. 120 - 40 = up to 80 for path with ext. dh/ + ext(.i) = 3+2
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88 final int MAX_DIR_PREFIX = 8 * (DIR_PREFIX_LEN + 1) - 4;
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89 sb = new StringBuilder(MAX_PATH_LEN);
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90 for (int i = 0; i < path.length(); i++) {
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91 final char ch = path.charAt(i);
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92 if (ch >= 'a' && ch <= 'z') {
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93 sb.append(ch);
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94 } else if (ch >= 'A' && ch <= 'Z') {
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95 sb.append((char) (ch | 0x20)); // lowercase
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96 } else if (reservedChars.indexOf(ch) != -1) {
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97 sb.append('~');
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98 sb.append(toHexByte(ch, hexByte));
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99 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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100 sb.append('~');
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101 sb.append(toHexByte(ch, hexByte));
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102 } else {
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103 sb.append(ch);
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104 }
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105 }
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106 encodeWindowsDeviceNames(sb);
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107 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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108 StringBuilder completeHashName = new StringBuilder(MAX_PATH_LEN);
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109 completeHashName.append(STR_STORE);
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110 completeHashName.append(STR_DH);
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111 if (fnameStart == -1) {
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112 // no dirs, just long filename
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113 sb.setLength(MAX_PATH_LEN - 40 /*digest.length()*/ - STR_DH.length() - ".i".length());
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114 completeHashName.append(sb);
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115 } else {
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116 StringBuilder sb2 = new StringBuilder(MAX_PATH_LEN);
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117 int x = 0;
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118 do {
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119 int i = sb.indexOf("/", x);
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120 final int sb2Len = sb2.length();
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121 if (i-x <= DIR_PREFIX_LEN) { // a b c d e f g h /
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122 sb2.append(sb, x, i + 1); // with slash
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123 } else {
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124 sb2.append(sb, x, x + DIR_PREFIX_LEN);
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125 // may unexpectedly end with bad character
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126 final int last = sb2.length()-1;
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127 char lastChar = sb2.charAt(last);
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128 assert lastChar == sb.charAt(x + DIR_PREFIX_LEN - 1);
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129 if (lastChar == '.' || lastChar == ' ') {
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130 sb2.setCharAt(last, '_');
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131 }
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132 sb2.append('/');
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133 }
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134 if (sb2.length()-1 > MAX_DIR_PREFIX) {
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135 sb2.setLength(sb2Len); // strip off last segment, it's too much
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136 break;
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137 }
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138 x = i+1;
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139 } while (x < fnameStart);
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140 assert sb2.charAt(sb2.length() - 1) == '/';
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141 int left = MAX_PATH_LEN - sb2.length() - 40 /*digest.length()*/ - STR_DH.length() - ".i".length();
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142 assert left >= 0;
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143 fnameStart++; // move from / to actual name
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144 sb2.append(sb, fnameStart, fnameStart + left > sb.length() ? sb.length() : fnameStart+left);
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145 completeHashName.append(sb2);
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146 }
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147 completeHashName.append(digest);
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148 sb = completeHashName;
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149 } else if (store) {
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150 sb.insert(0, STR_STORE + STR_DATA);
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151 }
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152 sb.append(".i");
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153 return sb.toString();
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154 }
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155
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156 private void encodeWindowsDeviceNames(StringBuilder sb) {
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157 char[] hexByte = new char[2];
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158 int x = 0; // last segment start
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159 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
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160 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(" ")));
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161 do {
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162 int i = sb.indexOf("/", x);
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163 if (i == -1) {
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164 i = sb.length();
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165 }
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166 // windows reserved filenames are at least of length 3
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167 if (i - x >= 3) {
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168 boolean found = false;
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169 if (i-x == 3 || i-x == 4) {
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170 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
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171 } else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
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172 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
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173 } else if (i-x > 4 && sb.charAt(x+4) == '.') {
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174 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
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175 }
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176 if (found) {
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177 sb.insert(x+3, toHexByte(sb.charAt(x+2), hexByte));
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178 sb.setCharAt(x+2, '~');
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179 i += 2;
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180 }
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181 }
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182 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
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183 sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
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diff changeset
184 sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
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185 i += 2;
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186 }
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187 x = i+1;
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188 } while (x < sb.length());
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189 }
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190
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191 private static char[] toHexByte(int ch, char[] buf) {
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192 assert buf.length > 1;
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193 final String hexDigits = "0123456789abcdef";
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194 buf[0] = hexDigits.charAt((ch & 0x00F0) >>> 4);
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195 buf[1] = hexDigits.charAt(ch & 0x0F);
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196 return buf;
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197 }
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198 }