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annotate src/org/tmatesoft/hg/internal/StoragePathHelper.java @ 260:61cb6724ff36

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Experimental alternative to HashMap in Pool to reduce memory footprint
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 17 Aug 2011 02:35:15 +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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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();
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141 assert left >= 0;
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142 fnameStart++; // move from / to actual name
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143 sb2.append(sb, fnameStart, fnameStart + left > sb.length() ? sb.length() : fnameStart+left);
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144 completeHashName.append(sb2);
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145 }
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146 completeHashName.append(digest);
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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 }
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154
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155 private void encodeWindowsDeviceNames(StringBuilder sb) {
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156 char[] hexByte = new char[2];
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157 int x = 0; // last segment start
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158 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
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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(" ")));
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160 do {
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161 int i = sb.indexOf("/", x);
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162 if (i == -1) {
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163 i = sb.length();
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164 }
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165 // windows reserved filenames are at least of length 3
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166 if (i - x >= 3) {
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167 boolean found = false;
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168 if (i-x == 3 || i-x == 4) {
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169 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
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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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diff changeset
171 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
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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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173 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
a5275143664c Complete path hash calculation of fncache requirement
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174 }
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175 if (found) {
a5275143664c Complete path hash calculation of fncache requirement
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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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181 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
182 sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
183 sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
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diff changeset
184 i += 2;
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185 }
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186 x = i+1;
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187 } while (x < sb.length());
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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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191 assert buf.length > 1;
6f1b88693d48 Complete refactoring to org.tmatesoft
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192 final String hexDigits = "0123456789abcdef";
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193 buf[0] = hexDigits.charAt((ch & 0x00F0) >>> 4);
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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 }