1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 3 of
// the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#include "vmime/utility/seekableInputStreamRegionAdapter.hpp"
namespace vmime {
namespace utility {
seekableInputStreamRegionAdapter::seekableInputStreamRegionAdapter(
const shared_ptr <seekableInputStream>& stream,
const size_t begin,
const size_t length
)
: m_stream(stream),
m_begin(begin),
m_length(length),
m_position(0) {
}
bool seekableInputStreamRegionAdapter::eof() const {
return m_position >= m_length;
}
void seekableInputStreamRegionAdapter::reset() {
m_position = 0;
}
size_t seekableInputStreamRegionAdapter::read(byte_t* const data, const size_t count) {
m_stream->seek(m_begin + m_position);
size_t readBytes = 0;
if (m_position + count >= m_length) {
const size_t remaining = m_length - m_position;
readBytes = m_stream->read(data, remaining);
} else {
readBytes = m_stream->read(data, count);
}
m_position += readBytes;
return readBytes;
}
size_t seekableInputStreamRegionAdapter::skip(const size_t count) {
if (m_position + count >= m_length) {
const size_t remaining = m_length - m_position;
m_position += remaining;
return remaining;
} else {
m_position += count;
return count;
}
}
size_t seekableInputStreamRegionAdapter::getPosition() const {
return m_position;
}
void seekableInputStreamRegionAdapter::seek(const size_t pos) {
if (pos > m_length) {
m_position = m_length;
} else {
m_position = pos;
}
}
} // utility
} // vmime
|
