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 #include <precomp.h>
25 #include <cosv/mbstream.hxx>
26
27 // NOT FULLY DECLARED SERVICES
28 #include <string.h>
29
30
31 namespace csv
32 {
33
34
35
mbstream(uintt i_nSize)36 mbstream::mbstream( uintt i_nSize )
37 : dpOwnedMemorySpace( new char[i_nSize+1] ),
38 nSize( i_nSize ),
39 nCurPosition( 0 )
40 {
41 dpOwnedMemorySpace[i_nSize] = '\0';
42 }
43
~mbstream()44 mbstream::~mbstream()
45 {
46 delete [] dpOwnedMemorySpace;
47 }
48
49 void
resize(uintt i_nSize)50 mbstream::resize( uintt i_nSize )
51 {
52 DYN char * pNew = new char[i_nSize];
53 memcpy( pNew, dpOwnedMemorySpace, min(i_nSize,nSize) );
54 delete [] dpOwnedMemorySpace;
55 dpOwnedMemorySpace = pNew;
56 nSize = i_nSize;
57 }
58
59 uintt
do_read(void * out_pDest,uintt i_nNrofBytes)60 mbstream::do_read( void * out_pDest,
61 uintt i_nNrofBytes )
62 {
63 uintt ret = min( i_nNrofBytes, nSize - nCurPosition );
64 memcpy( out_pDest, dpOwnedMemorySpace, ret );
65 nCurPosition += ret;
66 return ret;
67 }
68
69 bool
inq_eod() const70 mbstream::inq_eod() const
71 {
72 return nCurPosition == nSize;
73 }
74
75 uintt
do_write(const void * i_pSrc,uintt i_nNrofBytes)76 mbstream::do_write( const void * i_pSrc,
77 uintt i_nNrofBytes )
78 {
79 resize( max( 3 * (nSize+1) / 2, nCurPosition + i_nNrofBytes) );
80 memcpy( dpOwnedMemorySpace+nCurPosition, i_pSrc, i_nNrofBytes );
81 nCurPosition += i_nNrofBytes;
82 return i_nNrofBytes;
83 }
84
85 uintt
do_seek(intt i_nDistance,seek_dir i_eStartPoint)86 mbstream::do_seek( intt i_nDistance,
87 seek_dir i_eStartPoint )
88 {
89 switch ( i_eStartPoint )
90 {
91 case beg: if ( uintt(i_nDistance) < nSize )
92 nCurPosition = uintt(i_nDistance);
93 break;
94 case cur: if ( i_nDistance < 0
95 ? uintt(-i_nDistance) <= nCurPosition
96 : uintt(i_nDistance) + nCurPosition < nSize )
97 nCurPosition = uintt( intt(nCurPosition) + i_nDistance );
98 break;
99 case end: if ( i_nDistance < 0
100 AND uintt(-i_nDistance) < nSize - 1 )
101 nCurPosition = uintt( intt(nSize) - 1 + i_nDistance );
102 break;
103 }
104 return position();
105 }
106
107 uintt
inq_position() const108 mbstream::inq_position() const
109 {
110 return nCurPosition;
111 }
112
113
114 } // namespace csv
115
116