1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef CSV_BSTREAM_HXX 25 #define CSV_BSTREAM_HXX 26 27 #include <string.h> 28 #include <cosv/string.hxx> 29 30 31 namespace csv 32 { 33 34 35 enum seek_dir 36 { 37 beg = 0, 38 cur = 1, 39 end = 2 40 }; 41 42 43 class bistream 44 { 45 public: 46 // LIFECYCLE 47 virtual ~bistream() {} 48 49 // OPERATIONS 50 /// @return Number of actually read bytes. 51 uintt read( 52 void * out_pDest, 53 uintt i_nNrofBytes); 54 // INQUIRY 55 /** @return True, if already one try to read had failed. 56 There is no guarantee, that it returns true, if end of data 57 is just reached. 58 Though it will return false, if there is still somemething 59 to read. 60 */ 61 bool eod() const; 62 63 private: 64 virtual uintt do_read( 65 void * out_pDest, 66 uintt i_nNrofBytes) = 0; 67 virtual bool inq_eod() const = 0; 68 }; 69 70 71 class bostream 72 { 73 public: 74 // LIFECYCLE 75 virtual ~bostream() {} 76 77 // OPERATIONS 78 /// @return Number of actually written bytes. 79 uintt write( 80 const void * i_pSrc, 81 uintt i_nNrofBytes); 82 /// @return Number of actually written bytes. 83 uintt write( 84 const char * i_pSrc ); 85 /// @return Number of actually written bytes. 86 uintt write( 87 const String & i_pSrc ); 88 private: 89 virtual uintt do_write( 90 const void * i_pSrc, 91 uintt i_nNrofBytes) = 0; 92 }; 93 94 95 class bstream : public bistream, 96 public bostream 97 { 98 public: 99 uintt seek( 100 intt i_nDistanceFromBegin, 101 seek_dir i_eStartPoint = ::csv::beg ); 102 uintt position() const; 103 104 private: 105 virtual uintt do_seek( 106 intt i_nDistance, 107 seek_dir i_eStartPoint = ::csv::beg ) = 0; 108 virtual uintt inq_position() const = 0; 109 }; 110 111 112 // IMPLEMENTATION 113 inline uintt 114 bistream::read( void * o_pDest, 115 uintt i_nNrofBytes) 116 { return do_read(o_pDest, i_nNrofBytes); } 117 inline bool 118 bistream::eod() const 119 { return inq_eod(); } 120 121 inline uintt 122 bostream::write( const void * i_pSrc, 123 uintt i_nNrofBytes) 124 { return do_write( i_pSrc, i_nNrofBytes ); } 125 inline uintt 126 bostream::write( const char * i_sSrc ) 127 { return write( i_sSrc, strlen(i_sSrc) ); } 128 inline uintt 129 bostream::write( const String & i_sSrc ) 130 { return write( i_sSrc.c_str(), i_sSrc.length() ); } 131 132 inline uintt 133 bstream::seek( intt i_nDistance, 134 seek_dir i_eStartPoint ) 135 { return do_seek( i_nDistance, i_eStartPoint ); } 136 inline uintt 137 bstream::position() const 138 { return inq_position(); } 139 140 141 142 } // namespace csv 143 144 145 #endif 146 147