Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/StoragePathHelper.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
parents 48f993aa2f41
children 5e0313485eef
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.nio.ByteBuffer;
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20 import java.nio.CharBuffer;
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21 import java.nio.charset.Charset;
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22 import java.nio.charset.CharsetEncoder;
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23 import java.util.Arrays;
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24 import java.util.TreeSet;
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25 import java.util.regex.Matcher;
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26 import java.util.regex.Pattern;
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28 import org.tmatesoft.hg.util.PathRewrite;
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30 /**
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31 * @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
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32 * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
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33 * @see http://mercurial.selenic.com/wiki/EncodingStrategy
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 class StoragePathHelper implements PathRewrite {
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39
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40 private final boolean store;
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41 private final boolean fncache;
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42 private final boolean dotencode;
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43 private final Pattern suffix2replace;
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44 private final CharsetEncoder csEncoder;
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45 private final char[] hexEncodedByte = new char[] {'~', '0', '0'};
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46 private final ByteBuffer byteEncodingBuf;
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47 private final CharBuffer charEncodingBuf;
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48
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49 public StoragePathHelper(boolean isStore, boolean isFncache, boolean isDotencode) {
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50 this(isStore, isFncache, isDotencode, Charset.defaultCharset());
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51 }
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52
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53 public StoragePathHelper(boolean isStore, boolean isFncache, boolean isDotencode, Charset fsEncoding) {
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54 assert fsEncoding != null;
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55 store = isStore;
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56 fncache = isFncache;
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57 dotencode = isDotencode;
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58 suffix2replace = Pattern.compile("\\.([id]|hg)/");
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59 csEncoder = fsEncoding.newEncoder();
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60 byteEncodingBuf = ByteBuffer.allocate(Math.round(csEncoder.maxBytesPerChar()) + 1/*in fact, need ceil, hence +1*/);
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61 charEncodingBuf = CharBuffer.allocate(1);
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62 }
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63
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64 /**
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65 * path argument is repository-relative name of the user's file.
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66 * It has to be normalized (slashes) and shall not include extension .i or .d.
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67 */
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68 public CharSequence rewrite(CharSequence p) {
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69 final String STR_STORE = "store/";
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70 final String STR_DATA = "data/";
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71 final String STR_DH = "dh/";
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72 final String reservedChars = "\\:*?\"<>|";
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74 Matcher suffixMatcher = suffix2replace.matcher(p);
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75 CharSequence path;
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76 // Matcher.replaceAll, but without extra toString
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77 boolean found = suffixMatcher.find();
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78 if (found) {
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79 StringBuffer sb = new StringBuffer(p.length() + 20);
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80 do {
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81 suffixMatcher.appendReplacement(sb, ".$1.hg/");
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82 } while (found = suffixMatcher.find());
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83 suffixMatcher.appendTail(sb);
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84 path = sb;
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85 } else {
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86 path = p;
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87 }
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89 StringBuilder sb = new StringBuilder(path.length() << 1);
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90 if (store || fncache) {
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91 for (int i = 0; i < path.length(); i++) {
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92 final char ch = path.charAt(i);
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93 if (ch >= 'a' && ch <= 'z') {
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94 sb.append(ch); // POIRAE
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95 } else if (ch >= 'A' && ch <= 'Z') {
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96 sb.append('_');
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97 sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20?
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98 } else if (reservedChars.indexOf(ch) != -1) {
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99 sb.append(toHexByte(ch));
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100 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
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101 sb.append(toHexByte(ch));
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102 } else if (ch == '_') {
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103 sb.append('_');
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104 sb.append('_');
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105 } else {
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106 // either ASCII char that doesn't require special handling, or an Unicode character to get encoded
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107 // according to filesystem/native encoding, see http://mercurial.selenic.com/wiki/EncodingStrategy
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108 // despite of what the page says, use of native encoding seems worst solution to me (repositories
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109 // can't be easily shared between OS'es with different encodings then, e.g. Win1251 and Linux UTF8).
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110 // If the ease of sharing was not the point, what's the reason to mangle with names at all then (
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111 // lowercase and exclude reserved device names).
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112 if (ch < '~' /*126*/ || !csEncoder.canEncode(ch)) {
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113 sb.append(ch);
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114 } else {
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115 appendEncoded(sb, ch);
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116 }
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117 }
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118 }
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119 // auxencode
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120 if (fncache) {
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121 encodeWindowsDeviceNames(sb);
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122 }
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123 }
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124 final int MAX_PATH_LEN = 120;
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125 if (fncache && (sb.length() + STR_DATA.length() + ".i".length() > MAX_PATH_LEN)) {
411
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126 // TODO [post-1.0] Mercurial uses system encoding for paths, hence we need to pass bytes to DigestHelper
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127 // to ensure our sha1 value (default encoding of unicode string if one looks into DH impl) match that
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128 // produced by Mercurial (based on native string).
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129 String digest = new DigestHelper().sha1(STR_DATA, path, ".i").asHexString();
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130 final int DIR_PREFIX_LEN = 8;
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131 // not sure why (-4) is here. 120 - 40 = up to 80 for path with ext. dh/ + ext(.i) = 3+2
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132 final int MAX_DIR_PREFIX = 8 * (DIR_PREFIX_LEN + 1) - 4;
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133 sb = new StringBuilder(MAX_PATH_LEN);
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134 for (int i = 0; i < path.length(); i++) {
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135 final char ch = path.charAt(i);
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136 if (ch >= 'a' && ch <= 'z') {
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diff changeset
137 sb.append(ch);
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138 } else if (ch >= 'A' && ch <= 'Z') {
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139 sb.append((char) (ch | 0x20)); // lowercase
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140 } else if (reservedChars.indexOf(ch) != -1) {
411
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141 sb.append(toHexByte(ch));
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142 } else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
411
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143 sb.append(toHexByte(ch));
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144 } else {
411
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145 if (ch < '~' /*126*/ || !csEncoder.canEncode(ch)) {
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146 sb.append(ch);
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147 } else {
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148 appendEncoded(sb, ch);
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149 }
83
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150 }
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151 }
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152 encodeWindowsDeviceNames(sb);
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153 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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diff changeset
154 StringBuilder completeHashName = new StringBuilder(MAX_PATH_LEN);
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diff changeset
155 completeHashName.append(STR_STORE);
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diff changeset
156 completeHashName.append(STR_DH);
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diff changeset
157 if (fnameStart == -1) {
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158 // no dirs, just long filename
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159 sb.setLength(MAX_PATH_LEN - 40 /*digest.length()*/ - STR_DH.length() - ".i".length());
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diff changeset
160 completeHashName.append(sb);
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diff changeset
161 } else {
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diff changeset
162 StringBuilder sb2 = new StringBuilder(MAX_PATH_LEN);
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diff changeset
163 int x = 0;
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164 do {
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165 int i = sb.indexOf("/", x);
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166 final int sb2Len = sb2.length();
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diff changeset
167 if (i-x <= DIR_PREFIX_LEN) { // a b c d e f g h /
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diff changeset
168 sb2.append(sb, x, i + 1); // with slash
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169 } else {
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diff changeset
170 sb2.append(sb, x, x + DIR_PREFIX_LEN);
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171 // may unexpectedly end with bad character
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diff changeset
172 final int last = sb2.length()-1;
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173 char lastChar = sb2.charAt(last);
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diff changeset
174 assert lastChar == sb.charAt(x + DIR_PREFIX_LEN - 1);
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175 if (lastChar == '.' || lastChar == ' ') {
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diff changeset
176 sb2.setCharAt(last, '_');
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177 }
83
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diff changeset
178 sb2.append('/');
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179 }
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180 if (sb2.length()-1 > MAX_DIR_PREFIX) {
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181 sb2.setLength(sb2Len); // strip off last segment, it's too much
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diff changeset
182 break;
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183 }
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diff changeset
184 x = i+1;
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185 } while (x < fnameStart);
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diff changeset
186 assert sb2.charAt(sb2.length() - 1) == '/';
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diff changeset
187 int left = MAX_PATH_LEN - sb2.length() - 40 /*digest.length()*/ - STR_DH.length() - ".i".length();
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188 assert left >= 0;
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189 fnameStart++; // move from / to actual name
346
6d2c6b2469fc Issue 18: Invalid storage path for certain long names
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diff changeset
190 if (fnameStart + left > sb.length()) {
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parents: 292
diff changeset
191 // there left less chars in the mangled name that we can fit
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diff changeset
192 sb2.append(sb, fnameStart, sb.length());
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diff changeset
193 int stillAvailable = (fnameStart+left) - sb.length();
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diff changeset
194 // stillAvailable > 0;
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diff changeset
195 sb2.append(".i", 0, stillAvailable > 2 ? 2 : stillAvailable);
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diff changeset
196 } else {
6d2c6b2469fc Issue 18: Invalid storage path for certain long names
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diff changeset
197 // add as much as we can
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diff changeset
198 sb2.append(sb, fnameStart, fnameStart+left);
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diff changeset
199 }
83
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
200 completeHashName.append(sb2);
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201 }
83
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
202 completeHashName.append(digest);
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
203 sb = completeHashName;
a5275143664c Complete path hash calculation of fncache requirement
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diff changeset
204 } else if (store) {
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parents:
diff changeset
205 sb.insert(0, STR_STORE + STR_DATA);
6f1b88693d48 Complete refactoring to org.tmatesoft
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parents:
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206 }
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207 sb.append(".i");
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208 return sb.toString();
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209 }
83
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diff changeset
210
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diff changeset
211 private void encodeWindowsDeviceNames(StringBuilder sb) {
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diff changeset
212 int x = 0; // last segment start
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diff changeset
213 final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
214 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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parents: 80
diff changeset
215 do {
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diff changeset
216 int i = sb.indexOf("/", x);
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diff changeset
217 if (i == -1) {
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diff changeset
218 i = sb.length();
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219 }
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diff changeset
220 // windows reserved filenames are at least of length 3
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diff changeset
221 if (i - x >= 3) {
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diff changeset
222 boolean found = false;
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diff changeset
223 if (i-x == 3 || i-x == 4) {
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
224 found = windowsReservedFilenames.contains(sb.subSequence(x, i));
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
225 } 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
226 found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
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parents: 80
diff changeset
227 } else if (i-x > 4 && sb.charAt(x+4) == '.') {
a5275143664c Complete path hash calculation of fncache requirement
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parents: 80
diff changeset
228 found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
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diff changeset
229 }
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diff changeset
230 if (found) {
411
464b4404e75d Issue 29: Bad storage path translation - translate Unicode chars to filesystem encoding
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parents: 346
diff changeset
231 // x+2 as we change the third letter in device name
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parents: 346
diff changeset
232 replace(sb, x+2, toHexByte(sb.charAt(x+2)));
83
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diff changeset
233 i += 2;
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234 }
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235 }
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diff changeset
236 if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
411
464b4404e75d Issue 29: Bad storage path translation - translate Unicode chars to filesystem encoding
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parents: 346
diff changeset
237 char dotOrSpace = sb.charAt(x); // beware, replace() below changes charAt(x), rather get a copy
464b4404e75d Issue 29: Bad storage path translation - translate Unicode chars to filesystem encoding
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parents: 346
diff changeset
238 // not to get ~7e for '.' instead of ~2e, if later refactoring changes the logic
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diff changeset
239 replace(sb, x, toHexByte(dotOrSpace));
83
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diff changeset
240 i += 2;
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diff changeset
241 }
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diff changeset
242 x = i+1;
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diff changeset
243 } while (x < sb.length());
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244 }
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245
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246 // shall be synchronized in case of multithreaded use
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247 private void appendEncoded(StringBuilder sb, char ch) {
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248 charEncodingBuf.clear();
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249 byteEncodingBuf.clear();
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250 charEncodingBuf.put(ch).flip();
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251 csEncoder.encode(charEncodingBuf, byteEncodingBuf, false);
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252 byteEncodingBuf.flip();
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253 while (byteEncodingBuf.hasRemaining()) {
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254 sb.append(toHexByte(byteEncodingBuf.get()));
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255 }
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256 }
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257
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258 /**
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259 * replace char at sb[index] with a sequence
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260 */
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261 private static void replace(StringBuilder sb, int index, char[] with) {
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262 // there's StringBuilder.replace(int, int+1, String), but with char[] - I don't want to make a string out of hexEncodedByte
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263 sb.setCharAt(index, with[0]);
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264 sb.insert(index+1, with, 1, with.length - 1);
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265 }
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266
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267 /**
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268 * put hex representation of byte ch into buf from specified offset
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269 */
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270 private char[] toHexByte(int ch) {
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271 final String hexDigits = "0123456789abcdef";
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272 hexEncodedByte[1] = hexDigits.charAt((ch & 0x00F0) >>> 4);
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273 hexEncodedByte[2] = hexDigits.charAt(ch & 0x0F);
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274 return hexEncodedByte;
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275 }
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276 }