Parent: [14ab69] (diff)

Download this file

mime-inputsource.h    223 lines (188 with data), 5.6 kB

  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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* -*- mode:c++;c-basic-offset:2 -*- */
/* --------------------------------------------------------------------
* Filename:
* src/mime-inputsource.h
*
* Description:
* The base class of the MIME input source
* --------------------------------------------------------------------
* Copyright 2002-2005 Andreas Aardal Hanssen
*
* 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., 59 Temple Street #330, Boston, MA 02111-1307, USA.
* --------------------------------------------------------------------
*/
#ifndef mime_inputsource_h_included
#define mime_inputsource_h_included
#include "autoconfig.h"
// Data source for MIME parser
// Note about large files: we might want to change the unsigned int
// used for offsets into an off_t for intellectual satisfaction, but
// in the context of recoll, we could only get into trouble if a
// *single message* exceeded 2GB, which seems rather unlikely. When
// parsing a mailbox files, we read each message in memory and use the
// stream input source (from a memory buffer, no file offsets). When
// parsing a raw message file, it's only one message.
#include <string.h>
#include "safeunistd.h"
#include <iostream>
namespace Binc {
class MimeInputSource {
public:
// Note that we do NOT take ownership of fd, won't close it on delete
inline MimeInputSource(int fd, unsigned int start = 0);
virtual inline ~MimeInputSource(void);
virtual inline ssize_t fillRaw(char *raw, size_t nbytes);
virtual inline void reset(void);
virtual inline bool fillInputBuffer(void);
inline void seek(unsigned int offset);
inline bool getChar(char *c);
inline void ungetChar(void);
inline int getFileDescriptor(void) const;
inline unsigned int getOffset(void) const;
private:
int fd;
char data[16384];
unsigned int offset;
unsigned int tail;
unsigned int head;
unsigned int start;
char lastChar;
};
inline MimeInputSource::MimeInputSource(int fd, unsigned int start)
{
this->fd = fd;
this->start = start;
offset = 0;
tail = 0;
head = 0;
lastChar = '\0';
memset(data, '\0', sizeof(data));
seek(start);
}
inline MimeInputSource::~MimeInputSource(void)
{
}
inline ssize_t MimeInputSource::fillRaw(char *raw, size_t nbytes)
{
return read(fd, raw, nbytes);
}
inline bool MimeInputSource::fillInputBuffer(void)
{
char raw[4096];
ssize_t nbytes = fillRaw(raw, 4096);
if (nbytes <= 0) {
// FIXME: If ferror(crlffile) we should log this.
return false;
}
for (ssize_t i = 0; i < nbytes; ++i) {
const char c = raw[i];
if (c == '\r') {
if (lastChar == '\r') {
data[tail++ & (0x4000-1)] = '\r';
data[tail++ & (0x4000-1)] = '\n';
}
} else if (c == '\n') {
data[tail++ & (0x4000-1)] = '\r';
data[tail++ & (0x4000-1)] = '\n';
} else {
if (lastChar == '\r') {
data[tail++ & (0x4000-1)] = '\r';
data[tail++ & (0x4000-1)] = '\n';
}
data[tail++ & (0x4000-1)] = c;
}
lastChar = c;
}
return true;
}
inline void MimeInputSource::reset(void)
{
offset = head = tail = 0;
lastChar = '\0';
if (fd != -1)
lseek(fd, 0, SEEK_SET);
}
inline void MimeInputSource::seek(unsigned int seekToOffset)
{
if (offset > seekToOffset)
reset();
char c;
int n = 0;
while (seekToOffset > offset) {
if (!getChar(&c))
break;
++n;
}
}
inline bool MimeInputSource::getChar(char *c)
{
if (head == tail && !fillInputBuffer())
return false;
*c = data[head++ & (0x4000-1)];
++offset;
return true;
}
inline void MimeInputSource::ungetChar()
{
--head;
--offset;
}
inline int MimeInputSource::getFileDescriptor(void) const
{
return fd;
}
inline unsigned int MimeInputSource::getOffset(void) const
{
return offset;
}
///////////////////////////////////
class MimeInputSourceStream : public MimeInputSource {
public:
inline MimeInputSourceStream(istream& s, unsigned int start = 0);
virtual inline ssize_t fillRaw(char *raw, size_t nb);
virtual inline void reset(void);
private:
istream& s;
};
inline MimeInputSourceStream::MimeInputSourceStream(istream& si,
unsigned int start)
: MimeInputSource(-1, start), s(si)
{
}
inline ssize_t MimeInputSourceStream::fillRaw(char *raw, size_t nb)
{
// Why can't streams tell how many characters were actually read
// when hitting eof ?
std::streampos st = s.tellg();
s.seekg(0, ios::end);
std::streampos lst = s.tellg();
s.seekg(st);
size_t nbytes = size_t(lst - st);
if (nbytes > nb) {
nbytes = nb;
}
if (nbytes <= 0) {
return (ssize_t)-1;
}
s.read(raw, nbytes);
return static_cast<ssize_t>(nbytes);
}
inline void MimeInputSourceStream::reset(void)
{
MimeInputSource::reset();
s.seekg(0);
}
}
#endif