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
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.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 2 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.
*/
#include "config.h"
#include "BufferedReader.hxx"
#include "Reader.hxx"
#include "util/TextFile.hxx"
#include <stdexcept>
#include <stdint.h>
#include <string.h>
bool
BufferedReader::Fill(bool need_more)
{
if (eof)
return !need_more;
auto w = buffer.Write();
if (w.IsEmpty()) {
if (buffer.GetCapacity() >= MAX_SIZE)
return !need_more;
buffer.Grow(buffer.GetCapacity() * 2);
w = buffer.Write();
assert(!w.IsEmpty());
}
size_t nbytes = reader.Read(w.data, w.size);
if (nbytes == 0) {
eof = true;
return !need_more;
}
buffer.Append(nbytes);
return true;
}
void *
BufferedReader::ReadFull(size_t size)
{
while (true) {
auto r = Read();
if (r.size >= size)
return r.data;
if (!Fill(true))
throw std::runtime_error("Premature end of file");
}
}
size_t
BufferedReader::ReadFromBuffer(WritableBuffer<void> dest) noexcept
{
auto src = Read();
size_t nbytes = std::min(src.size, dest.size);
memcpy(dest.data, src.data, nbytes);
Consume(nbytes);
return nbytes;
}
void
BufferedReader::ReadFull(WritableBuffer<void> _dest)
{
auto dest = WritableBuffer<uint8_t>::FromVoid(_dest);
assert(dest.size == _dest.size);
while (true) {
size_t nbytes = ReadFromBuffer(dest.ToVoid());
dest.skip_front(nbytes);
if (dest.size == 0)
break;
if (!Fill(true))
throw std::runtime_error("Premature end of file");
}
}
char *
BufferedReader::ReadLine()
{
do {
char *line = ReadBufferedLine(buffer);
if (line != nullptr) {
++line_number;
return line;
}
} while (Fill(true));
if (!eof || buffer.IsEmpty())
return nullptr;
auto w = buffer.Write();
if (w.IsEmpty()) {
buffer.Grow(buffer.GetCapacity() + 1);
w = buffer.Write();
assert(!w.IsEmpty());
}
/* terminate the last line */
w[0] = 0;
char *line = buffer.Read().data;
buffer.Clear();
++line_number;
return line;
}
|
