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File indexing completed on 2025-12-16 10:34:40
0001 //------------------------------------------------------------------------------ 0002 // Copyright (c) 2011-2014 by European Organization for Nuclear Research (CERN) 0003 // Author: Michal Simon <michal.simon@cern.ch> 0004 //------------------------------------------------------------------------------ 0005 // This file is part of the XRootD software suite. 0006 // 0007 // XRootD is free software: you can redistribute it and/or modify 0008 // it under the terms of the GNU Lesser General Public License as published by 0009 // the Free Software Foundation, either version 3 of the License, or 0010 // (at your option) any later version. 0011 // 0012 // XRootD is distributed in the hope that it will be useful, 0013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 0014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0015 // GNU General Public License for more details. 0016 // 0017 // You should have received a copy of the GNU Lesser General Public License 0018 // along with XRootD. If not, see <http://www.gnu.org/licenses/>. 0019 // 0020 // In applying this licence, CERN does not waive the privileges and immunities 0021 // granted to it by virtue of its status as an Intergovernmental Organization 0022 // or submit itself to any jurisdiction. 0023 //------------------------------------------------------------------------------ 0024 0025 #ifndef SRC_XRDZIP_XRDZIPUTILS_HH_ 0026 #define SRC_XRDZIP_XRDZIPUTILS_HH_ 0027 0028 #include "XrdSys/XrdSysPlatform.hh" 0029 0030 #include <algorithm> 0031 #include <cstdint> 0032 #include <cstring> 0033 #include <ctime> 0034 #include <iterator> 0035 #include <vector> 0036 0037 namespace XrdZip 0038 { 0039 //--------------------------------------------------------------------------- 0040 // Exception indicating corrupted data 0041 //--------------------------------------------------------------------------- 0042 struct bad_data : public std::exception { }; 0043 0044 //--------------------------------------------------------------------------- 0045 // Provides overflow value for unsigned int types 0046 //--------------------------------------------------------------------------- 0047 template<typename UINT> 0048 struct ovrflw 0049 { 0050 static const UINT value = -1; 0051 }; 0052 0053 //--------------------------------------------------------------------------- 0054 // Buffer type (a typedef for std::vector<char>) 0055 //--------------------------------------------------------------------------- 0056 typedef std::vector<char> buffer_t; 0057 0058 //--------------------------------------------------------------------------- 0059 // Copies integer byte by byte into a buffer 0060 //--------------------------------------------------------------------------- 0061 template<typename INT> 0062 inline static void copy_bytes( const INT value, buffer_t &buffer) 0063 { 0064 const char *begin = reinterpret_cast<const char*>( &value ); 0065 const char *end = begin + sizeof( INT ); 0066 #ifdef Xrd_Big_Endian 0067 std::reverse_copy( begin, end, std::back_inserter( buffer ) ); 0068 #else 0069 std::copy( begin, end, std::back_inserter( buffer ) ); 0070 #endif 0071 } 0072 0073 //--------------------------------------------------------------------------- 0074 // Copies bytes into an integer type and advances the buffer by the number 0075 // of bytes read. 0076 //--------------------------------------------------------------------------- 0077 template<typename INT> 0078 inline static void from_buffer( INT &var, const char *&buffer ) 0079 { 0080 memcpy( &var, buffer, sizeof( INT ) ); 0081 #ifdef Xrd_Big_Endian 0082 var = bswap(var); 0083 #endif 0084 buffer += sizeof( INT ); 0085 } 0086 0087 //--------------------------------------------------------------------------- 0088 // Converts bytes into an integer type 0089 //--------------------------------------------------------------------------- 0090 template<typename INT> 0091 inline static INT to( const char *buffer ) 0092 { 0093 INT value; 0094 memcpy( &value, buffer, sizeof( INT ) ); 0095 #ifdef Xrd_Big_Endian 0096 value = bswap(value); 0097 #endif 0098 return value; 0099 } 0100 0101 //--------------------------------------------------------------------------- 0102 // Generate a DOS timestamp (time/date) 0103 //--------------------------------------------------------------------------- 0104 struct dos_timestmp 0105 { 0106 //------------------------------------------------------------------------- 0107 // Default constructor (creates a timestamp for current time) 0108 //------------------------------------------------------------------------- 0109 inline dos_timestmp() : time( 0 ), date( 0 ) 0110 { 0111 const std::time_t now = std::time( nullptr ); 0112 const std::tm calendar_time = *std::localtime( std::addressof( now ) ); 0113 0114 time |= ( hour_mask & uint16_t( calendar_time.tm_hour ) ) << hour_shift; 0115 time |= ( min_mask & uint16_t( calendar_time.tm_min ) ) << min_shift; 0116 time |= ( sec_mask & uint16_t( calendar_time.tm_sec / 2 ) ) << sec_shift; 0117 0118 date |= ( year_mask & uint16_t( calendar_time.tm_year - 1980 ) ) << year_shift; 0119 date |= ( mon_mask & uint16_t( calendar_time.tm_mon ) ) << mon_shift; 0120 date |= ( day_mask & uint16_t( calendar_time.tm_mday ) ) << day_shift; 0121 } 0122 0123 //------------------------------------------------------------------------- 0124 // Constructs a DOS timestamp from time_t value 0125 //------------------------------------------------------------------------- 0126 inline dos_timestmp( time_t timestmp ) : time( 0 ), date( 0 ) 0127 { 0128 const std::tm calendar_time = *std::localtime( std::addressof( timestmp ) ); 0129 0130 time |= ( hour_mask & uint16_t( calendar_time.tm_hour ) ) << hour_shift; 0131 time |= ( min_mask & uint16_t( calendar_time.tm_min ) ) << min_shift; 0132 time |= ( sec_mask & uint16_t( calendar_time.tm_sec / 2 ) ) << sec_shift; 0133 0134 date |= ( year_mask & uint16_t( calendar_time.tm_year - 1980 ) ) << year_shift; 0135 date |= ( mon_mask & uint16_t( calendar_time.tm_mon ) ) << mon_shift; 0136 date |= ( day_mask & uint16_t( calendar_time.tm_mday ) ) << day_shift; 0137 } 0138 0139 //------------------------------------------------------------------------- 0140 // The time part of the DOS timestamp 0141 //------------------------------------------------------------------------- 0142 uint16_t time; 0143 0144 static const uint16_t sec_mask = 0x1f; //< seconds mask 0145 static const uint16_t min_mask = 0x3f; //< minutes mask 0146 static const uint16_t hour_mask = 0x1f; //< hour mask 0147 0148 static const uint8_t sec_shift = 0; //< seconds shift 0149 static const uint8_t min_shift = 5; //< minutes shift 0150 static const uint8_t hour_shift = 11; //< hour shift 0151 0152 //------------------------------------------------------------------------- 0153 // The date part of the DOS timestamp 0154 //------------------------------------------------------------------------- 0155 uint16_t date; 0156 0157 static const uint16_t day_mask = 0x1f; //< day mask 0158 static const uint16_t mon_mask = 0x0f; //< month mask 0159 static const uint16_t year_mask = 0x7f; //< year mask 0160 0161 static const uint8_t day_shift = 0; //< day shift 0162 static const uint8_t mon_shift = 5; //< month shift 0163 static const uint8_t year_shift = 9; //< year shift 0164 }; 0165 } 0166 0167 #endif /* SRC_XRDZIP_XRDZIPUTILS_HH_ */
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