aboutsummaryrefslogtreecommitdiffstats
path: root/src/archive/bz2_archive_plugin.c
blob: 75b4b1eceb1fc17b1acd4c87177bd26ee4344920 (plain) (blame)
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
/*
 * Copyright (C) 2003-2010 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.
 */

/**
  * single bz2 archive handling (requires libbz2)
  */

#include "config.h"
#include "archive/bz2_archive_plugin.h"
#include "archive_api.h"
#include "input_plugin.h"
#include "refcount.h"

#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <glib.h>
#include <bzlib.h>

#ifdef HAVE_OLDER_BZIP2
#define BZ2_bzDecompressInit bzDecompressInit
#define BZ2_bzDecompress bzDecompress
#endif

struct bz2_archive_file {
	struct archive_file base;

	struct refcount ref;

	char *name;
	bool reset;
	struct input_stream *istream;
};

struct bz2_input_stream {
	struct input_stream base;

	struct bz2_archive_file *archive;

	bool eof;

	bz_stream bzstream;

	char buffer[5000];
};

static const struct input_plugin bz2_inputplugin;

static inline GQuark
bz2_quark(void)
{
	return g_quark_from_static_string("bz2");
}

/* single archive handling allocation helpers */

static bool
bz2_alloc(struct bz2_input_stream *data, GError **error_r)
{
	int ret;

	data->bzstream.bzalloc = NULL;
	data->bzstream.bzfree  = NULL;
	data->bzstream.opaque  = NULL;

	data->bzstream.next_in = (void *) data->buffer;
	data->bzstream.avail_in = 0;

	ret = BZ2_bzDecompressInit(&data->bzstream, 0, 0);
	if (ret != BZ_OK) {
		g_free(data);

		g_set_error(error_r, bz2_quark(), ret,
			    "BZ2_bzDecompressInit() has failed");
		return false;
	}

	return true;
}

static void
bz2_destroy(struct bz2_input_stream *data)
{
	BZ2_bzDecompressEnd(&data->bzstream);
}

/* archive open && listing routine */

static struct archive_file *
bz2_open(const char *pathname, GError **error_r)
{
	struct bz2_archive_file *context;
	int len;

	context = g_malloc(sizeof(*context));
	archive_file_init(&context->base, &bz2_archive_plugin);
	refcount_init(&context->ref);

	//open archive
	context->istream = input_stream_open(pathname, error_r);
	if (context->istream == NULL) {
		g_free(context);
		return NULL;
	}

	context->name = g_path_get_basename(pathname);

	//remove suffix
	len = strlen(context->name);
	if (len > 4) {
		context->name[len - 4] = 0; //remove .bz2 suffix
	}

	return &context->base;
}

static void
bz2_scan_reset(struct archive_file *file)
{
	struct bz2_archive_file *context = (struct bz2_archive_file *) file;
	context->reset = true;
}

static char *
bz2_scan_next(struct archive_file *file)
{
	struct bz2_archive_file *context = (struct bz2_archive_file *) file;
	char *name = NULL;

	if (context->reset) {
		name = context->name;
		context->reset = false;
	}

	return name;
}

static void
bz2_close(struct archive_file *file)
{
	struct bz2_archive_file *context = (struct bz2_archive_file *) file;

	if (!refcount_dec(&context->ref))
		return;

	g_free(context->name);

	input_stream_close(context->istream);
	g_free(context);
}

/* single archive handling */

static struct input_stream *
bz2_open_stream(struct archive_file *file,
		G_GNUC_UNUSED const char *path, GError **error_r)
{
	struct bz2_archive_file *context = (struct bz2_archive_file *) file;
	struct bz2_input_stream *bis = g_new(struct bz2_input_stream, 1);

	input_stream_init(&bis->base, &bz2_inputplugin);

	bis->archive = context;

	bis->base.ready = true;
	bis->base.seekable = false;

	if (!bz2_alloc(bis, error_r)) {
		g_free(bis);
		return NULL;
	}

	bis->eof = false;

	refcount_inc(&context->ref);

	return &bis->base;
}

static void
bz2_is_close(struct input_stream *is)
{
	struct bz2_input_stream *bis = (struct bz2_input_stream *)is;

	bz2_destroy(bis);

	bz2_close(&bis->archive->base);

	g_free(bis);
}

static bool
bz2_fillbuffer(struct bz2_input_stream *bis, GError **error_r)
{
	size_t count;
	bz_stream *bzstream;

	bzstream = &bis->bzstream;

	if (bzstream->avail_in > 0)
		return true;

	count = input_stream_read(bis->archive->istream,
				  bis->buffer, sizeof(bis->buffer),
				  error_r);
	if (count == 0)
		return false;

	bzstream->next_in = bis->buffer;
	bzstream->avail_in = count;
	return true;
}

static size_t
bz2_is_read(struct input_stream *is, void *ptr, size_t length,
	    GError **error_r)
{
	struct bz2_input_stream *bis = (struct bz2_input_stream *)is;
	bz_stream *bzstream;
	int bz_result;
	size_t nbytes = 0;

	if (bis->eof)
		return 0;

	bzstream = &bis->bzstream;
	bzstream->next_out = ptr;
	bzstream->avail_out = length;

	do {
		if (!bz2_fillbuffer(bis, error_r))
			return 0;

		bz_result = BZ2_bzDecompress(bzstream);

		if (bz_result == BZ_STREAM_END) {
			bis->eof = true;
			break;
		}

		if (bz_result != BZ_OK) {
			g_set_error(error_r, bz2_quark(), bz_result,
				    "BZ2_bzDecompress() has failed");
			return 0;
		}
	} while (bzstream->avail_out == length);

	nbytes = length - bzstream->avail_out;
	is->offset += nbytes;

	return nbytes;
}

static bool
bz2_is_eof(struct input_stream *is)
{
	struct bz2_input_stream *bis = (struct bz2_input_stream *)is;

	return bis->eof;
}

/* exported structures */

static const char *const bz2_extensions[] = {
	"bz2",
	NULL
};

static const struct input_plugin bz2_inputplugin = {
	.close = bz2_is_close,
	.read = bz2_is_read,
	.eof = bz2_is_eof,
};

const struct archive_plugin bz2_archive_plugin = {
	.name = "bz2",
	.open = bz2_open,
	.scan_reset = bz2_scan_reset,
	.scan_next = bz2_scan_next,
	.open_stream = bz2_open_stream,
	.close = bz2_close,
	.suffixes = bz2_extensions
};