444 lines
13 KiB
C++
444 lines
13 KiB
C++
//========= Copyright Valve Corporation ============//
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#include "strtools.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __linux__
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#define stricmp strcasecmp
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#define strnicmp strncasecmp
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#endif
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//-----------------------------------------------------------------------------
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// Purpose:
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//-----------------------------------------------------------------------------
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bool StringHasPrefix( const std::string & sString, const std::string & sPrefix )
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{
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return 0 == strnicmp( sString.c_str(), sPrefix.c_str(), sPrefix.length() );
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}
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bool StringHasPrefixCaseSensitive( const std::string & sString, const std::string & sPrefix )
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{
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return 0 == strncmp( sString.c_str(), sPrefix.c_str(), sPrefix.length() );
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}
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bool StringHasSuffix( const std::string &sString, const std::string &sSuffix )
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{
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size_t cStrLen = sString.length();
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size_t cSuffixLen = sSuffix.length();
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if ( cSuffixLen > cStrLen )
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return false;
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std::string sStringSuffix = sString.substr( cStrLen - cSuffixLen, cSuffixLen );
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return 0 == stricmp( sStringSuffix.c_str(), sSuffix.c_str() );
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}
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bool StringHasSuffixCaseSensitive( const std::string &sString, const std::string &sSuffix )
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{
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size_t cStrLen = sString.length();
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size_t cSuffixLen = sSuffix.length();
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if ( cSuffixLen > cStrLen )
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return false;
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std::string sStringSuffix = sString.substr( cStrLen - cSuffixLen, cSuffixLen );
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return 0 == strncmp( sStringSuffix.c_str(), sSuffix.c_str(),cSuffixLen );
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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//-----------------------------------------------------------------------------
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std::string UTF16to8(const wchar_t * in)
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{
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std::string out;
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unsigned int codepoint = 0;
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for ( ; in && *in != 0; ++in )
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{
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if (*in >= 0xd800 && *in <= 0xdbff)
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codepoint = ((*in - 0xd800) << 10) + 0x10000;
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else
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{
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if (*in >= 0xdc00 && *in <= 0xdfff)
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codepoint |= *in - 0xdc00;
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else
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codepoint = *in;
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if (codepoint <= 0x7f)
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out.append(1, static_cast<char>(codepoint));
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else if (codepoint <= 0x7ff)
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{
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out.append(1, static_cast<char>(0xc0 | ((codepoint >> 6) & 0x1f)));
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out.append(1, static_cast<char>(0x80 | (codepoint & 0x3f)));
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}
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else if (codepoint <= 0xffff)
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{
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out.append(1, static_cast<char>(0xe0 | ((codepoint >> 12) & 0x0f)));
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out.append(1, static_cast<char>(0x80 | ((codepoint >> 6) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | (codepoint & 0x3f)));
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}
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else
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{
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out.append(1, static_cast<char>(0xf0 | ((codepoint >> 18) & 0x07)));
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out.append(1, static_cast<char>(0x80 | ((codepoint >> 12) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | ((codepoint >> 6) & 0x3f)));
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out.append(1, static_cast<char>(0x80 | (codepoint & 0x3f)));
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}
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codepoint = 0;
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}
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}
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return out;
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}
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std::wstring UTF8to16(const char * in)
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{
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std::wstring out;
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unsigned int codepoint = 0;
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int following = 0;
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for ( ; in && *in != 0; ++in )
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{
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unsigned char ch = *in;
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if (ch <= 0x7f)
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{
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codepoint = ch;
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following = 0;
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}
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else if (ch <= 0xbf)
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{
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if (following > 0)
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{
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codepoint = (codepoint << 6) | (ch & 0x3f);
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--following;
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}
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}
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else if (ch <= 0xdf)
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{
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codepoint = ch & 0x1f;
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following = 1;
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}
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else if (ch <= 0xef)
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{
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codepoint = ch & 0x0f;
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following = 2;
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}
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else
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{
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codepoint = ch & 0x07;
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following = 3;
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}
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if (following == 0)
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{
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if (codepoint > 0xffff)
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{
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out.append(1, static_cast<wchar_t>(0xd800 + (codepoint >> 10)));
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out.append(1, static_cast<wchar_t>(0xdc00 + (codepoint & 0x03ff)));
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}
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else
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out.append(1, static_cast<wchar_t>(codepoint));
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codepoint = 0;
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}
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}
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return out;
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}
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void strcpy_safe( char *pchBuffer, size_t unBufferSizeBytes, const char *pchSource )
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{
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pchBuffer[ unBufferSizeBytes - 1 ] = '\0';
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strncpy( pchBuffer, pchSource, unBufferSizeBytes - 1 );
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}
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// --------------------------------------------------------------------
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// Purpose: converts a string to upper case
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// --------------------------------------------------------------------
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std::string StringToUpper( const std::string & sString )
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{
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std::string sOut;
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sOut.reserve( sString.size() + 1 );
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for( std::string::const_iterator i = sString.begin(); i != sString.end(); i++ )
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{
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sOut.push_back( (char)toupper( *i ) );
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}
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return sOut;
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}
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// --------------------------------------------------------------------
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// Purpose: converts a string to lower case
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// --------------------------------------------------------------------
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std::string StringToLower( const std::string & sString )
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{
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std::string sOut;
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sOut.reserve( sString.size() + 1 );
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for( std::string::const_iterator i = sString.begin(); i != sString.end(); i++ )
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{
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sOut.push_back( (char)tolower( *i ) );
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}
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return sOut;
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}
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uint32_t ReturnStdString( const std::string & sValue, char *pchBuffer, uint32_t unBufferLen )
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{
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uint32_t unLen = (uint32_t)sValue.length() + 1;
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if( !pchBuffer || !unBufferLen )
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return unLen;
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if( unBufferLen < unLen )
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{
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pchBuffer[0] = '\0';
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}
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else
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{
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memcpy( pchBuffer, sValue.c_str(), unLen );
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}
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return unLen;
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}
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void BufferToStdString( std::string & sDest, const char *pchBuffer, uint32_t unBufferLen )
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{
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sDest.resize( unBufferLen + 1 );
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memcpy( const_cast< char* >( sDest.c_str() ), pchBuffer, unBufferLen );
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const_cast< char* >( sDest.c_str() )[ unBufferLen ] = '\0';
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}
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/** Returns a std::string from a uint64_t */
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std::string Uint64ToString( uint64_t ulValue )
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{
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char buf[ 22 ];
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#if defined( _WIN32 )
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sprintf_s( buf, "%llu", ulValue );
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#else
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snprintf( buf, sizeof( buf ), "%llu", (long long unsigned int ) ulValue );
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#endif
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return buf;
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}
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/** returns a uint64_t from a string */
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uint64_t StringToUint64( const std::string & sValue )
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{
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return strtoull( sValue.c_str(), NULL, 0 );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Helper for converting a numeric value to a hex digit, value should be 0-15.
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//-----------------------------------------------------------------------------
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char cIntToHexDigit( int nValue )
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{
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//Assert( nValue >= 0 && nValue <= 15 );
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return "0123456789ABCDEF"[ nValue & 15 ];
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}
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//-----------------------------------------------------------------------------
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// Purpose: Helper for converting a hex char value to numeric, return -1 if the char
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// is not a valid hex digit.
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//-----------------------------------------------------------------------------
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int iHexCharToInt( char cValue )
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{
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int32_t iValue = cValue;
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if ( (uint32_t)( iValue - '0' ) < 10 )
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return iValue - '0';
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iValue |= 0x20;
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if ( (uint32_t)( iValue - 'a' ) < 6 )
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return iValue - 'a' + 10;
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return -1;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Internal implementation of encode, works in the strict RFC manner, or
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// with spaces turned to + like HTML form encoding.
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//-----------------------------------------------------------------------------
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void V_URLEncodeInternal( char *pchDest, int nDestLen, const char *pchSource, int nSourceLen, bool bUsePlusForSpace )
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{
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//AssertMsg( nDestLen > 3*nSourceLen, "Target buffer for V_URLEncode should be 3x source length, plus one for terminating null\n" );
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int iDestPos = 0;
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for ( int i=0; i < nSourceLen; ++i )
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{
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// worst case we need 3 additional chars
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if( (iDestPos+3) > nDestLen )
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{
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pchDest[0] = '\0';
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// AssertMsg( false, "Target buffer too short\n" );
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return;
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}
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// We allow only a-z, A-Z, 0-9, period, underscore, and hyphen to pass through unescaped.
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// These are the characters allowed by both the original RFC 1738 and the latest RFC 3986.
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// Current specs also allow '~', but that is forbidden under original RFC 1738.
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if ( !( pchSource[i] >= 'a' && pchSource[i] <= 'z' ) && !( pchSource[i] >= 'A' && pchSource[i] <= 'Z' ) && !(pchSource[i] >= '0' && pchSource[i] <= '9' )
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&& pchSource[i] != '-' && pchSource[i] != '_' && pchSource[i] != '.'
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)
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{
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if ( bUsePlusForSpace && pchSource[i] == ' ' )
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{
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pchDest[iDestPos++] = '+';
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}
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else
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{
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pchDest[iDestPos++] = '%';
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uint8_t iValue = pchSource[i];
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if ( iValue == 0 )
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{
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pchDest[iDestPos++] = '0';
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pchDest[iDestPos++] = '0';
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}
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else
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{
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char cHexDigit1 = cIntToHexDigit( iValue % 16 );
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iValue /= 16;
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char cHexDigit2 = cIntToHexDigit( iValue );
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pchDest[iDestPos++] = cHexDigit2;
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pchDest[iDestPos++] = cHexDigit1;
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}
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}
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}
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else
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{
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pchDest[iDestPos++] = pchSource[i];
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}
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}
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if( (iDestPos+1) > nDestLen )
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{
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pchDest[0] = '\0';
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//AssertMsg( false, "Target buffer too short to terminate\n" );
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return;
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}
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// Null terminate
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pchDest[iDestPos++] = 0;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Internal implementation of decode, works in the strict RFC manner, or
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// with spaces turned to + like HTML form encoding.
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//
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// Returns the amount of space used in the output buffer.
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//-----------------------------------------------------------------------------
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size_t V_URLDecodeInternal( char *pchDecodeDest, int nDecodeDestLen, const char *pchEncodedSource, int nEncodedSourceLen, bool bUsePlusForSpace )
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{
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if ( nDecodeDestLen < nEncodedSourceLen )
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{
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//AssertMsg( false, "V_URLDecode needs a dest buffer at least as large as the source" );
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return 0;
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}
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int iDestPos = 0;
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for( int i=0; i < nEncodedSourceLen; ++i )
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{
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if ( bUsePlusForSpace && pchEncodedSource[i] == '+' )
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{
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pchDecodeDest[ iDestPos++ ] = ' ';
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}
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else if ( pchEncodedSource[i] == '%' )
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{
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// Percent signifies an encoded value, look ahead for the hex code, convert to numeric, and use that
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// First make sure we have 2 more chars
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if ( i < nEncodedSourceLen - 2 )
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{
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char cHexDigit1 = pchEncodedSource[i+1];
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char cHexDigit2 = pchEncodedSource[i+2];
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// Turn the chars into a hex value, if they are not valid, then we'll
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// just place the % and the following two chars direct into the string,
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// even though this really shouldn't happen, who knows what bad clients
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// may do with encoding.
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bool bValid = false;
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int iValue = iHexCharToInt( cHexDigit1 );
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if ( iValue != -1 )
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{
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iValue *= 16;
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int iValue2 = iHexCharToInt( cHexDigit2 );
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if ( iValue2 != -1 )
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{
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iValue += iValue2;
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pchDecodeDest[ iDestPos++ ] = (char)iValue;
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bValid = true;
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}
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}
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if ( !bValid )
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{
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pchDecodeDest[ iDestPos++ ] = '%';
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pchDecodeDest[ iDestPos++ ] = cHexDigit1;
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pchDecodeDest[ iDestPos++ ] = cHexDigit2;
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}
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}
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// Skip ahead
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i += 2;
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}
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else
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{
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pchDecodeDest[ iDestPos++ ] = pchEncodedSource[i];
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}
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}
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// We may not have extra room to NULL terminate, since this can be used on raw data, but if we do
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// go ahead and do it as this can avoid bugs.
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if ( iDestPos < nDecodeDestLen )
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{
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pchDecodeDest[iDestPos] = 0;
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}
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return (size_t)iDestPos;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Encodes a string (or binary data) from URL encoding format, see rfc1738 section 2.2.
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// This version of the call isn't a strict RFC implementation, but uses + for space as is
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// the standard in HTML form encoding, despite it not being part of the RFC.
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//
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// Dest buffer should be at least as large as source buffer to guarantee room for decode.
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//-----------------------------------------------------------------------------
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void V_URLEncode( char *pchDest, int nDestLen, const char *pchSource, int nSourceLen )
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{
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return V_URLEncodeInternal( pchDest, nDestLen, pchSource, nSourceLen, true );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Decodes a string (or binary data) from URL encoding format, see rfc1738 section 2.2.
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// This version of the call isn't a strict RFC implementation, but uses + for space as is
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// the standard in HTML form encoding, despite it not being part of the RFC.
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//
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// Dest buffer should be at least as large as source buffer to guarantee room for decode.
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// Dest buffer being the same as the source buffer (decode in-place) is explicitly allowed.
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//-----------------------------------------------------------------------------
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size_t V_URLDecode( char *pchDecodeDest, int nDecodeDestLen, const char *pchEncodedSource, int nEncodedSourceLen )
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{
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return V_URLDecodeInternal( pchDecodeDest, nDecodeDestLen, pchEncodedSource, nEncodedSourceLen, true );
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}
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//-----------------------------------------------------------------------------
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void V_StripExtension( std::string &in )
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{
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// Find the last dot. If it's followed by a dot or a slash, then it's part of a
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// directory specifier like ../../somedir/./blah.
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std::string::size_type test = in.rfind( '.' );
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if ( test != std::string::npos )
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{
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// This handles things like ".\blah" or "c:\my@email.com\abc\def\geh"
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// Which would otherwise wind up with "" and "c:\my@email", respectively.
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if ( in.rfind( '\\' ) < test && in.rfind( '/' ) < test )
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{
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in.resize( test );
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}
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}
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}
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