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
125
126
127
128
129
130
131
132
133
134
135
136
|
/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimensionxx.hpp"
#include <stdio.h>
// Use a tmpfile as a buffer for a C++/C I/O interface.
namespace Dimension
{
namespace
{
void
write_cookie(FILE* file, std::istream& istr)
{
unsigned int count, pos;
const unsigned int bs = 8192;
char buffer[bs];
pos = istr.tellg();
istr.seekg(0);
while (true) {
istr.read(buffer, bs);
count = istr.gcount();
if (count != bs) {
if (istr.eof()) {
fwrite(buffer, 1, count, file);
break;
} else {
throw Dimension_Error("Error reading from input stream.");
}
}
fwrite(buffer, 1, bs, file);
}
fseek(file, pos, SEEK_SET);
}
void
read_cookie(std::ostream& ostr, FILE* file)
{
unsigned int count, pos;
const unsigned int bs = 8192;
char buffer[bs];
pos = ftell(file);
rewind(file);
while (true) {
count = fread(buffer, 1, bs, file);
if (count != bs) {
if (feof(file)) {
ostr.write(buffer, count);
break;
} else {
throw Dimension_Error("Error reading from temporary file.");
}
}
ostr.write(buffer, bs);
}
ostr.seekp(pos);
}
}
// Make an input FILE_Cookie
FILE_Cookie::FILE_Cookie(std::istream& istr)
: m_file(tmpfile()), m_istr(&istr), m_ostr(0)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
write_cookie(m_file, *m_istr);
}
// Make an output FILE_Cookie
FILE_Cookie::FILE_Cookie(std::ostream& ostr)
: m_file(tmpfile()), m_istr(0), m_ostr(&ostr)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
}
// Make an I/O FILE_Cookie
FILE_Cookie::FILE_Cookie(std::iostream& iostr)
: m_file(tmpfile()), m_istr(&iostr), m_ostr(&iostr)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
write_cookie(m_file, *m_istr);
}
// Close the tmpfile, maybe syncing a C++ stream to it first
FILE_Cookie::~FILE_Cookie() {
if (is_output()) {
read_cookie(*m_ostr, m_file);
}
std::fclose(m_file);
}
FILE* FILE_Cookie::file() { return m_file; }
const FILE* FILE_Cookie::file() const { return m_file; }
bool FILE_Cookie::is_input() const { return m_istr; }
bool FILE_Cookie::is_output() const { return m_ostr; }
std::istream& FILE_Cookie::istr() { return *m_istr; }
const std::istream& FILE_Cookie::istr() const { return *m_istr; }
std::ostream& FILE_Cookie::ostr() { return *m_ostr; }
const std::ostream& FILE_Cookie::ostr() const { return *m_ostr; }
}
|
