author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 18 Jan 2010 20:28:24 +0200 | |
changeset 2 | 661f3784fe57 |
parent 1 | c42dffbd5b4f |
permissions | -rw-r--r-- |
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#if !defined(WEAVEPATH_CPP) |
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#define WEAVEPATH_CPP |
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|
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/*** |
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* |
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* Previously, each <OS>PlatformUtils.cpp has its onw copy of the |
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* method weavePaths(), and almost of them implemented the same logic, |
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* with few platform specific difference, and unfortunately that |
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* implementation was wrong. |
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* |
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* The only platform specific issue is slash character. |
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* On all platforms other than Windows, chForwardSlash and chBackSlash |
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* are considered slash, while on Windows, two additional characters, |
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* chYenSign and chWonSign are slash as well. |
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* |
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* The idea is to maintain a SINGLE copy of this method rather than |
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* each <OS>PlatformUtils.cpp has its own copy, we introduce a new |
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* method, XMLPlatformUtils::isAnySlash(), to replace the direct checking |
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* code ( if ( c == chForwardSlash || c == chBackSlash). |
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* |
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* With this approach, we might have a performance hit since isAnySlash() |
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* is so frequently used in this implementation, so we intend to make it |
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* inline. Then we face a complier issue. |
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* |
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* There are two compilation units involved, one is PlatformUtils.cpp and |
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* the other <OS>PlatformUtils.cpp. When PlatformUtils.cp get compiled, |
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* the weavePath(), remove**Slash() have dependency upon isAnySlash() which |
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* is in <OS>PlatformUtils.cpp (and what is worse, it is inlined), so we have |
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* undefined/unresolved symbol: isAnySlash() on AIX/xlc_r, Solaris/cc and |
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* Linux/gcc, while MSVC and HP/aCC are fine with this. |
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* |
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* That means we can not place these new methods in PlatformUtils.cpp with |
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* inlined XMLPlatformUtils::isAnySlash() in <OS>PlatformUtils.cpp. |
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* |
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* The solution to this is <os>PlatformUtils.cpp will include this file so that |
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* we have only one copy of these methods while get compiled in <os>PlatformUtils |
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* inlined isAnySlash(). |
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* |
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***/ |
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XMLCh* XMLPlatformUtils::weavePaths(const XMLCh* const basePath |
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, const XMLCh* const relativePath |
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, MemoryManager* const manager) |
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|
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{ |
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// Create a buffer as large as both parts and empty it |
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XMLCh* tmpBuf = (XMLCh*) manager->allocate |
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( |
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(XMLString::stringLen(basePath) |
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+ XMLString::stringLen(relativePath) + 2) * sizeof(XMLCh) |
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);//new XMLCh[XMLString::stringLen(basePath) + XMLString::stringLen(relativePath) + 2]; |
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*tmpBuf = 0; |
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|
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// |
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// If we have no base path, then just take the relative path as is. |
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// |
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if ((!basePath) || (!*basePath)) |
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{ |
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XMLString::copyString(tmpBuf, relativePath); |
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return tmpBuf; |
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} |
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|
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// |
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// Remove anything after the last slash |
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// |
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const XMLCh* basePtr = basePath + (XMLString::stringLen(basePath) - 1); |
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while ((basePtr >= basePath) && ((isAnySlash(*basePtr) == false))) |
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{ |
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basePtr--; |
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} |
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|
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// There is no relevant base path, so just take the relative part |
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if (basePtr < basePath) |
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{ |
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XMLString::copyString(tmpBuf, relativePath); |
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return tmpBuf; |
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} |
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|
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// |
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// 1. concatenate the base and relative |
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// 2. remove all occurences of "/./" |
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// 3. remove all occurences of segment/../ where segment is not ../ |
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// |
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|
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XMLString::subString(tmpBuf, basePath, 0, (basePtr - basePath + 1), manager); |
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tmpBuf[basePtr - basePath + 1] = 0; |
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XMLString::catString(tmpBuf, relativePath); |
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removeDotSlash(tmpBuf, manager); |
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removeDotDotSlash(tmpBuf, manager); |
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return tmpBuf; |
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} |
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// |
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// Remove all occurences of './' when it is part of '/./' |
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// |
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// Since it could be '.\' or other combination on windows ( eg, '.'+chYanSign) |
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// we can't make use of patterMatch(). |
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// |
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102 |
// |
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103 |
void XMLPlatformUtils::removeDotSlash(XMLCh* const path |
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104 |
, MemoryManager* const manager) |
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105 |
{ |
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106 |
if ((!path) || (!*path)) |
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107 |
return; |
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108 |
|
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109 |
XMLCh* srcPtr = XMLString::replicate(path, manager); |
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110 |
int srcLen = XMLString::stringLen(srcPtr); |
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111 |
ArrayJanitor<XMLCh> janName(srcPtr, manager); |
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112 |
XMLCh* tarPtr = path; |
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113 |
|
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114 |
while (*srcPtr) |
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115 |
{ |
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116 |
if ( 3 <= srcLen ) |
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117 |
{ |
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118 |
if ( (isAnySlash(*srcPtr)) && |
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119 |
(chPeriod == *(srcPtr+1)) && |
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120 |
(isAnySlash(*(srcPtr+2))) ) |
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121 |
{ |
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122 |
// "\.\x" seen |
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123 |
// skip the first two, and start from the 3rd, |
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124 |
// since "\x" could be another "\." |
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125 |
srcPtr+=2; |
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126 |
srcLen-=2; |
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127 |
} |
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128 |
else |
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129 |
{ |
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130 |
*tarPtr++ = *srcPtr++; // eat the current char |
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131 |
srcLen--; |
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132 |
} |
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133 |
} |
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134 |
else if ( 1 == srcLen ) |
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135 |
{ |
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136 |
*tarPtr++ = *srcPtr++; |
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137 |
} |
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138 |
else if ( 2 == srcLen) |
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139 |
{ |
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140 |
*tarPtr++ = *srcPtr++; |
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141 |
*tarPtr++ = *srcPtr++; |
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142 |
} |
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143 |
|
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144 |
} |
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145 |
|
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146 |
*tarPtr = 0; |
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147 |
|
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148 |
return; |
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149 |
} |
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150 |
|
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151 |
// |
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152 |
// Remove all occurences of '/segment/../' when segment is not '..' |
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153 |
// |
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154 |
// Cases with extra /../ is left to the underlying file system. |
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155 |
// |
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156 |
void XMLPlatformUtils::removeDotDotSlash(XMLCh* const path |
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157 |
, MemoryManager* const manager) |
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158 |
{ |
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159 |
int pathLen = XMLString::stringLen(path); |
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160 |
XMLCh* tmp1 = (XMLCh*) manager->allocate |
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161 |
( |
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162 |
(pathLen+1) * sizeof(XMLCh) |
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163 |
);//new XMLCh [pathLen+1]; |
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164 |
ArrayJanitor<XMLCh> tmp1Name(tmp1, manager); |
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165 |
|
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166 |
XMLCh* tmp2 = (XMLCh*) manager->allocate |
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167 |
( |
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168 |
(pathLen+1) * sizeof(XMLCh) |
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169 |
);//new XMLCh [pathLen+1]; |
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170 |
ArrayJanitor<XMLCh> tmp2Name(tmp2, manager); |
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171 |
|
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172 |
// remove all "<segment>/../" where "<segment>" is a complete |
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173 |
// path segment not equal to ".." |
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174 |
int index = -1; |
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175 |
int segIndex = -1; |
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176 |
int offset = 1; |
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177 |
|
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178 |
while ((index = searchSlashDotDotSlash(&(path[offset]))) != -1) |
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179 |
{ |
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180 |
// Undo offset |
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181 |
index += offset; |
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182 |
|
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183 |
// Find start of <segment> within substring ending at found point. |
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184 |
XMLString::subString(tmp1, path, 0, index-1, manager); |
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185 |
segIndex = index - 1; |
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186 |
while ((segIndex >= 0) && (!isAnySlash(tmp1[segIndex]))) |
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187 |
{ |
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188 |
segIndex--; |
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189 |
} |
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190 |
|
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191 |
// Ensure <segment> exists and != ".." |
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192 |
if (segIndex >= 0 && |
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193 |
(path[segIndex+1] != chPeriod || |
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194 |
path[segIndex+2] != chPeriod || |
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195 |
segIndex + 3 != index)) |
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196 |
{ |
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197 |
|
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198 |
XMLString::subString(tmp1, path, 0, segIndex, manager); |
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199 |
XMLString::subString(tmp2, path, index+3, XMLString::stringLen(path), manager); |
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|
200 |
|
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201 |
path[0] = 0; |
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202 |
XMLString::catString(path, tmp1); |
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203 |
XMLString::catString(path, tmp2); |
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204 |
|
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205 |
offset = (segIndex == 0 ? 1 : segIndex); |
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206 |
} |
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else |
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{ |
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offset += 4; |
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} |
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|
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}// while |
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|
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} |
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|
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int XMLPlatformUtils::searchSlashDotDotSlash(XMLCh* const srcPath) |
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{ |
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if ((!srcPath) || (!*srcPath)) |
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return -1; |
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|
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XMLCh* srcPtr = srcPath; |
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int srcLen = XMLString::stringLen(srcPath); |
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int retVal = -1; |
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|
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while (*srcPtr) |
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{ |
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if ( 4 <= srcLen ) |
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{ |
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if ( (isAnySlash(*srcPtr)) && |
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(chPeriod == *(srcPtr+1)) && |
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(chPeriod == *(srcPtr+2)) && |
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(isAnySlash(*(srcPtr+3))) ) |
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{ |
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retVal = (srcPtr - srcPath); |
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break; |
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} |
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else |
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{ |
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srcPtr++; |
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srcLen--; |
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} |
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} |
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else |
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{ |
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break; |
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} |
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|
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} // while |
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|
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return retVal; |
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|
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} |
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|
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#endif |