File: gmime-filter.c

package info (click to toggle)
gmime2 2.0.14-2
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 5,092 kB
  • ctags: 3,177
  • sloc: ansic: 29,973; sh: 8,234; makefile: 413; perl: 6
file content (334 lines) | stat: -rw-r--r-- 8,186 bytes parent folder | download | duplicates (2)
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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001-2004 Ximian, Inc. (www.ximian.com)
 *
 *  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.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h> /* for memcpy */

#include "gmime-filter.h"


struct _GMimeFilterPrivate {
	char *inbuf;
	size_t inlen;
};

#define PRE_HEAD (64)
#define BACK_HEAD (64)
#define _PRIVATE(o) (((GMimeFilter *)(o))->priv)

static void g_mime_filter_class_init (GMimeFilterClass *klass);
static void g_mime_filter_init (GMimeFilter *filter, GMimeFilterClass *klass);
static void g_mime_filter_finalize (GObject *object);

static GMimeFilter *filter_copy (GMimeFilter *filter);
static void filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
			   char **out, size_t *outlen, size_t *outprespace);
static void filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
			     char **out, size_t *outlen, size_t *outprespace);
static void filter_reset (GMimeFilter *filter);


static GObjectClass *parent_class = NULL;


GType
g_mime_filter_get_type (void)
{
	static GType type = 0;
	
	if (!type) {
		static const GTypeInfo info = {
			sizeof (GMimeFilterClass),
			NULL, /* base_class_init */
			NULL, /* base_class_finalize */
			(GClassInitFunc) g_mime_filter_class_init,
			NULL, /* class_finalize */
			NULL, /* class_data */
			sizeof (GMimeFilter),
			0,    /* n_preallocs */
			(GInstanceInitFunc) g_mime_filter_init,
		};
		
		type = g_type_register_static (G_TYPE_OBJECT, "GMimeFilter", &info, 0);
	}
	
	return type;
}


static void
g_mime_filter_class_init (GMimeFilterClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	
	parent_class = g_type_class_ref (G_TYPE_OBJECT);
	
	object_class->finalize = g_mime_filter_finalize;
	
	klass->copy = filter_copy;
	klass->filter = filter_filter;
	klass->complete = filter_complete;
	klass->reset = filter_reset;
}

static void
g_mime_filter_init (GMimeFilter *filter, GMimeFilterClass *klass)
{
	filter->priv = g_new0 (struct _GMimeFilterPrivate, 1);
	filter->outptr = NULL;
	filter->outreal = NULL;
	filter->outbuf = NULL;
	filter->outsize = 0;
	
	filter->backbuf = NULL;
	filter->backsize = 0;
	filter->backlen = 0;
}

static void
g_mime_filter_finalize (GObject *object)
{
	GMimeFilter *filter = (GMimeFilter *) object;
	
	g_free (filter->priv->inbuf);
	g_free (filter->priv);
	g_free (filter->outreal);
	g_free (filter->backbuf);
	
	G_OBJECT_CLASS (parent_class)->finalize (object);
}


static GMimeFilter *
filter_copy (GMimeFilter *filter)
{
	return NULL;
}


/**
 * g_mime_filter_copy:
 * @filter: filter
 *
 * Copies @filter into a new GMimeFilter object.
 *
 * Returns a duplicate of @filter.
 **/
GMimeFilter *
g_mime_filter_copy (GMimeFilter *filter)
{
	g_return_val_if_fail (GMIME_IS_FILTER (filter), NULL);
	
	return GMIME_FILTER_GET_CLASS (filter)->copy (filter);
}


static void
filter_run (GMimeFilter *filter, char *in, size_t len, size_t prespace,
	    char **out, size_t *outlen, size_t *outprespace,
	    void (*filterfunc) (GMimeFilter *filter,
				char *in, size_t len, size_t prespace,
				char **out, size_t *outlen, size_t *outprespace))
{
	/* here we take a performance hit, if the input buffer doesn't
	   have the pre-space required.  We make a buffer that does... */
	if (prespace < filter->backlen) {
		struct _GMimeFilterPrivate *p = _PRIVATE (filter);
		size_t newlen = len + prespace + filter->backlen;
		
		if (p->inlen < newlen) {
			/* NOTE: g_realloc copies data, we dont need that (slower) */
			g_free (p->inbuf);
			p->inbuf = g_malloc (newlen + PRE_HEAD);
			p->inlen = newlen + PRE_HEAD;
		}
		
		/* copy to end of structure */
		memcpy (p->inbuf + p->inlen - len, in, len);
		in = p->inbuf + p->inlen - len;
		prespace = p->inlen - len;
	}
	
	/* preload any backed up data */
	if (filter->backlen > 0) {
		memcpy (in - filter->backlen, filter->backbuf, filter->backlen);
		in -= filter->backlen;
		len += filter->backlen;
		prespace -= filter->backlen;
		filter->backlen = 0;
	}
	
	filterfunc (filter, in, len, prespace, out, outlen, outprespace);
}


static void
filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
	       char **out, size_t *outlen, size_t *outprespace)
{
	/* no-op */
}


/**
 * g_mime_filter_filter:
 * @filter: filter
 * @in: input buffer
 * @len: input buffer length
 * @prespace: prespace buffer length
 * @out: pointer to output buffer
 * @outlen: pointer to output length
 * @outprespace: pointer to output prespace buffer length
 *
 * Filters the input data and writes it to @out.
 **/
void
g_mime_filter_filter (GMimeFilter *filter, char *in, size_t len, size_t prespace,
		      char **out, size_t *outlen, size_t *outprespace)
{
	g_return_if_fail (GMIME_IS_FILTER (filter));
	
	filter_run (filter, in, len, prespace, out, outlen, outprespace,
		    GMIME_FILTER_GET_CLASS (filter)->filter);
}


static void
filter_complete (GMimeFilter *filter, char *in, size_t len, size_t prespace,
		 char **out, size_t *outlen, size_t *outprespace)
{
	/* no-op */
}


/**
 * g_mime_filter_complete:
 * @filter: filter
 * @in: input buffer
 * @len: input length
 * @prespace: prespace buffer length
 * @out: pointer to output buffer
 * @outlen: pointer to output length
 * @outprespace: pointer to output prespace buffer length
 *
 * Completes the filtering.
 **/
void
g_mime_filter_complete (GMimeFilter *filter,
			char *in, size_t len, size_t prespace,
			char **out, size_t *outlen, size_t *outprespace)
{
	g_return_if_fail (GMIME_IS_FILTER (filter));
	
	filter_run (filter, in, len, prespace, out, outlen, outprespace,
		    GMIME_FILTER_GET_CLASS (filter)->complete);
}


static void
filter_reset (GMimeFilter *filter)
{
	/* no-op */
}


/**
 * g_mime_filter_reset:
 * @filter:
 *
 * Resets the filter.
 **/
void
g_mime_filter_reset (GMimeFilter *filter)
{
	g_return_if_fail (GMIME_IS_FILTER (filter));
	
	GMIME_FILTER_GET_CLASS (filter)->reset (filter);
	
	/* could free some buffers, if they are really big? */
	filter->backlen = 0;
}


/**
 * g_mime_filter_backup:
 * @filter: filter
 * @data: 
 * @length: 
 *
 * Sets number of bytes backed up on the input, new calls replace
 * previous ones
 **/
void
g_mime_filter_backup (GMimeFilter *filter, const char *data, size_t length)
{
	g_return_if_fail (GMIME_IS_FILTER (filter));
	
	if (filter->backsize < length) {
		/* g_realloc copies data, unnecessary overhead */
		g_free (filter->backbuf);
		filter->backbuf = g_malloc (length + BACK_HEAD);
		filter->backsize = length + BACK_HEAD;
	}
	
	filter->backlen = length;
	memcpy (filter->backbuf, data, length);
}


/**
 * g_mime_filter_set_size:
 * @filter: filter
 * @size: 
 * @keep: 
 *
 * Ensure this much size available for filter output (if required)
 **/
void
g_mime_filter_set_size (GMimeFilter *filter, size_t size, gboolean keep)
{
	g_return_if_fail (GMIME_IS_FILTER (filter));
	
	if (filter->outsize < size) {
		size_t offset = filter->outptr - filter->outreal;
		
		if (keep) {
			filter->outreal = g_realloc (filter->outreal, size + PRE_HEAD * 4);
		} else {
			g_free (filter->outreal);
			filter->outreal = g_malloc (size + PRE_HEAD * 4);
		}
		
		filter->outptr = filter->outreal + offset;
		filter->outbuf = filter->outreal + PRE_HEAD * 4;
		filter->outsize = size;
		
		/* this could be offset from the end of the structure, but 
		   this should be good enough */
		
		filter->outpre = PRE_HEAD * 4;
	}
}