1 /**************************************************************
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
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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
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11 * http://www.apache.org/licenses/LICENSE-2.0
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15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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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
~bistream()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
~bostream()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
read(void * o_pDest,uintt i_nNrofBytes)114 bistream::read( void * o_pDest,
115 uintt i_nNrofBytes)
116 { return do_read(o_pDest, i_nNrofBytes); }
117 inline bool
eod() const118 bistream::eod() const
119 { return inq_eod(); }
120
121 inline uintt
write(const void * i_pSrc,uintt i_nNrofBytes)122 bostream::write( const void * i_pSrc,
123 uintt i_nNrofBytes)
124 { return do_write( i_pSrc, i_nNrofBytes ); }
125 inline uintt
write(const char * i_sSrc)126 bostream::write( const char * i_sSrc )
127 { return write( i_sSrc, strlen(i_sSrc) ); }
128 inline uintt
write(const String & i_sSrc)129 bostream::write( const String & i_sSrc )
130 { return write( i_sSrc.c_str(), i_sSrc.length() ); }
131
132 inline uintt
seek(intt i_nDistance,seek_dir i_eStartPoint)133 bstream::seek( intt i_nDistance,
134 seek_dir i_eStartPoint )
135 { return do_seek( i_nDistance, i_eStartPoint ); }
136 inline uintt
position() const137 bstream::position() const
138 { return inq_position(); }
139
140
141
142 } // namespace csv
143
144
145 #endif
146
147