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1 office 1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2009 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Alexander Larsson <alexl@redhat.com>
19 */
20  
21 #include "config.h"
22  
23 #include "gzlibdecompressor.h"
24  
25 #include <errno.h>
26 #include <zlib.h>
27 #include <string.h>
28  
29 #include "gfileinfo.h"
30 #include "gioerror.h"
31 #include "gioenums.h"
32 #include "gioenumtypes.h"
33 #include "glibintl.h"
34  
35  
36 enum {
37 PROP_0,
38 PROP_FORMAT,
39 PROP_FILE_INFO
40 };
41  
42 /**
43 * SECTION:gzdecompressor
44 * @short_description: Zlib decompressor
45 * @include: gio/gio.h
46 *
47 * #GZlibDecompressor is an implementation of #GConverter that
48 * decompresses data compressed with zlib.
49 */
50  
51 static void g_zlib_decompressor_iface_init (GConverterIface *iface);
52  
53 typedef struct {
54 gz_header gzheader;
55 char filename[257];
56 GFileInfo *file_info;
57 } HeaderData;
58  
59 /**
60 * GZlibDecompressor:
61 *
62 * Zlib decompression
63 */
64 struct _GZlibDecompressor
65 {
66 GObject parent_instance;
67  
68 GZlibCompressorFormat format;
69 z_stream zstream;
70 HeaderData *header_data;
71 };
72  
73 static void
74 g_zlib_decompressor_set_gzheader (GZlibDecompressor *decompressor)
75 {
76 /* On win32, these functions were not exported before 1.2.4 */
77 #if !defined (G_OS_WIN32) || ZLIB_VERNUM >= 0x1240
78 if (decompressor->format != G_ZLIB_COMPRESSOR_FORMAT_GZIP)
79 return;
80  
81 if (decompressor->header_data != NULL)
82 {
83 if (decompressor->header_data->file_info)
84 g_object_unref (decompressor->header_data->file_info);
85  
86 memset (decompressor->header_data, 0, sizeof (HeaderData));
87 }
88 else
89 {
90 decompressor->header_data = g_new0 (HeaderData, 1);
91 }
92  
93 decompressor->header_data->gzheader.name = (Bytef*) &decompressor->header_data->filename;
94 /* We keep one byte to guarantee the string is 0-terminated */
95 decompressor->header_data->gzheader.name_max = 256;
96  
97 if (inflateGetHeader (&decompressor->zstream, &decompressor->header_data->gzheader) != Z_OK)
98 g_warning ("unexpected zlib error: %s\n", decompressor->zstream.msg);
99 #endif /* !G_OS_WIN32 || ZLIB >= 1.2.4 */
100 }
101  
102 G_DEFINE_TYPE_WITH_CODE (GZlibDecompressor, g_zlib_decompressor, G_TYPE_OBJECT,
103 G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
104 g_zlib_decompressor_iface_init))
105  
106 static void
107 g_zlib_decompressor_finalize (GObject *object)
108 {
109 GZlibDecompressor *decompressor;
110  
111 decompressor = G_ZLIB_DECOMPRESSOR (object);
112  
113 inflateEnd (&decompressor->zstream);
114  
115 if (decompressor->header_data != NULL)
116 {
117 if (decompressor->header_data->file_info)
118 g_object_unref (decompressor->header_data->file_info);
119 g_free (decompressor->header_data);
120 }
121  
122 G_OBJECT_CLASS (g_zlib_decompressor_parent_class)->finalize (object);
123 }
124  
125  
126 static void
127 g_zlib_decompressor_set_property (GObject *object,
128 guint prop_id,
129 const GValue *value,
130 GParamSpec *pspec)
131 {
132 GZlibDecompressor *decompressor;
133  
134 decompressor = G_ZLIB_DECOMPRESSOR (object);
135  
136 switch (prop_id)
137 {
138 case PROP_FORMAT:
139 decompressor->format = g_value_get_enum (value);
140 break;
141  
142 default:
143 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
144 break;
145 }
146  
147 }
148  
149 static void
150 g_zlib_decompressor_get_property (GObject *object,
151 guint prop_id,
152 GValue *value,
153 GParamSpec *pspec)
154 {
155 GZlibDecompressor *decompressor;
156  
157 decompressor = G_ZLIB_DECOMPRESSOR (object);
158  
159 switch (prop_id)
160 {
161 case PROP_FORMAT:
162 g_value_set_enum (value, decompressor->format);
163 break;
164  
165 case PROP_FILE_INFO:
166 if (decompressor->header_data)
167 g_value_set_object (value, decompressor->header_data->file_info);
168 else
169 g_value_set_object (value, NULL);
170 break;
171  
172 default:
173 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
174 break;
175 }
176 }
177  
178 static void
179 g_zlib_decompressor_init (GZlibDecompressor *decompressor)
180 {
181 }
182  
183 static void
184 g_zlib_decompressor_constructed (GObject *object)
185 {
186 GZlibDecompressor *decompressor;
187 int res;
188  
189 decompressor = G_ZLIB_DECOMPRESSOR (object);
190  
191 if (decompressor->format == G_ZLIB_COMPRESSOR_FORMAT_GZIP)
192 {
193 /* + 16 for gzip */
194 res = inflateInit2 (&decompressor->zstream, MAX_WBITS + 16);
195 }
196 else if (decompressor->format == G_ZLIB_COMPRESSOR_FORMAT_RAW)
197 {
198 /* Negative for raw */
199 res = inflateInit2 (&decompressor->zstream, -MAX_WBITS);
200 }
201 else /* ZLIB */
202 res = inflateInit (&decompressor->zstream);
203  
204 if (res == Z_MEM_ERROR )
205 g_error ("GZlibDecompressor: Not enough memory for zlib use");
206  
207 if (res != Z_OK)
208 g_warning ("unexpected zlib error: %s\n", decompressor->zstream.msg);
209  
210 g_zlib_decompressor_set_gzheader (decompressor);
211 }
212  
213 static void
214 g_zlib_decompressor_class_init (GZlibDecompressorClass *klass)
215 {
216 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
217  
218 gobject_class->finalize = g_zlib_decompressor_finalize;
219 gobject_class->constructed = g_zlib_decompressor_constructed;
220 gobject_class->get_property = g_zlib_decompressor_get_property;
221 gobject_class->set_property = g_zlib_decompressor_set_property;
222  
223 g_object_class_install_property (gobject_class,
224 PROP_FORMAT,
225 g_param_spec_enum ("format",
226 P_("compression format"),
227 P_("The format of the compressed data"),
228 G_TYPE_ZLIB_COMPRESSOR_FORMAT,
229 G_ZLIB_COMPRESSOR_FORMAT_ZLIB,
230 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
231 G_PARAM_STATIC_STRINGS));
232  
233 /**
234 * GZlibDecompressor:file-info:
235 *
236 * A #GFileInfo containing the information found in the GZIP header
237 * of the data stream processed, or %NULL if the header was not yet
238 * fully processed, is not present at all, or the compressor's
239 * #GZlibDecompressor:format property is not %G_ZLIB_COMPRESSOR_FORMAT_GZIP.
240 *
241 * Since: 2.26
242 */
243 g_object_class_install_property (gobject_class,
244 PROP_FILE_INFO,
245 g_param_spec_object ("file-info",
246 P_("file info"),
247 P_("File info"),
248 G_TYPE_FILE_INFO,
249 G_PARAM_READABLE |
250 G_PARAM_STATIC_STRINGS));
251 }
252  
253 /**
254 * g_zlib_decompressor_new:
255 * @format: The format to use for the compressed data
256 *
257 * Creates a new #GZlibDecompressor.
258 *
259 * Returns: a new #GZlibDecompressor
260 *
261 * Since: 2.24
262 **/
263 GZlibDecompressor *
264 g_zlib_decompressor_new (GZlibCompressorFormat format)
265 {
266 GZlibDecompressor *decompressor;
267  
268 decompressor = g_object_new (G_TYPE_ZLIB_DECOMPRESSOR,
269 "format", format,
270 NULL);
271  
272 return decompressor;
273 }
274  
275 /**
276 * g_zlib_decompressor_get_file_info:
277 * @decompressor: a #GZlibDecompressor
278 *
279 * Retrieves the #GFileInfo constructed from the GZIP header data
280 * of compressed data processed by @compressor, or %NULL if @decompressor's
281 * #GZlibDecompressor:format property is not %G_ZLIB_COMPRESSOR_FORMAT_GZIP,
282 * or the header data was not fully processed yet, or it not present in the
283 * data stream at all.
284 *
285 * Returns: (transfer none): a #GFileInfo, or %NULL
286 *
287 * Since: 2.26
288 */
289 GFileInfo *
290 g_zlib_decompressor_get_file_info (GZlibDecompressor *decompressor)
291 {
292 g_return_val_if_fail (G_IS_ZLIB_DECOMPRESSOR (decompressor), NULL);
293  
294 if (decompressor->header_data)
295 return decompressor->header_data->file_info;
296  
297 return NULL;
298 }
299  
300 static void
301 g_zlib_decompressor_reset (GConverter *converter)
302 {
303 GZlibDecompressor *decompressor = G_ZLIB_DECOMPRESSOR (converter);
304 int res;
305  
306 res = inflateReset (&decompressor->zstream);
307 if (res != Z_OK)
308 g_warning ("unexpected zlib error: %s\n", decompressor->zstream.msg);
309  
310 g_zlib_decompressor_set_gzheader (decompressor);
311 }
312  
313 static GConverterResult
314 g_zlib_decompressor_convert (GConverter *converter,
315 const void *inbuf,
316 gsize inbuf_size,
317 void *outbuf,
318 gsize outbuf_size,
319 GConverterFlags flags,
320 gsize *bytes_read,
321 gsize *bytes_written,
322 GError **error)
323 {
324 GZlibDecompressor *decompressor;
325 int res;
326  
327 decompressor = G_ZLIB_DECOMPRESSOR (converter);
328  
329 decompressor->zstream.next_in = (void *)inbuf;
330 decompressor->zstream.avail_in = inbuf_size;
331  
332 decompressor->zstream.next_out = outbuf;
333 decompressor->zstream.avail_out = outbuf_size;
334  
335 res = inflate (&decompressor->zstream, Z_NO_FLUSH);
336  
337 if (res == Z_DATA_ERROR || res == Z_NEED_DICT)
338 {
339 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA,
340 _("Invalid compressed data"));
341 return G_CONVERTER_ERROR;
342 }
343  
344 if (res == Z_MEM_ERROR)
345 {
346 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
347 _("Not enough memory"));
348 return G_CONVERTER_ERROR;
349 }
350  
351 if (res == Z_STREAM_ERROR)
352 {
353 g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
354 _("Internal error: %s"), decompressor->zstream.msg);
355 return G_CONVERTER_ERROR;
356 }
357  
358 if (res == Z_BUF_ERROR)
359 {
360 if (flags & G_CONVERTER_FLUSH)
361 return G_CONVERTER_FLUSHED;
362  
363 /* Z_FINISH not set, so this means no progress could be made */
364 /* We do have output space, so this should only happen if we
365 have no input but need some */
366  
367 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT,
368 _("Need more input"));
369 return G_CONVERTER_ERROR;
370 }
371  
372 g_assert (res == Z_OK || res == Z_STREAM_END);
373  
374 *bytes_read = inbuf_size - decompressor->zstream.avail_in;
375 *bytes_written = outbuf_size - decompressor->zstream.avail_out;
376  
377 #if !defined (G_OS_WIN32) || ZLIB_VERNUM >= 0x1240
378 if (decompressor->header_data != NULL &&
379 decompressor->header_data->gzheader.done == 1)
380 {
381 HeaderData *data = decompressor->header_data;
382  
383 /* So we don't notify again */
384 data->gzheader.done = 2;
385  
386 data->file_info = g_file_info_new ();
387 g_file_info_set_attribute_uint64 (data->file_info,
388 G_FILE_ATTRIBUTE_TIME_MODIFIED,
389 data->gzheader.time);
390 g_file_info_set_attribute_uint32 (data->file_info,
391 G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC,
392 0);
393  
394 if (data->filename[0] != '\0')
395 g_file_info_set_attribute_byte_string (data->file_info,
396 G_FILE_ATTRIBUTE_STANDARD_NAME,
397 data->filename);
398  
399 g_object_notify (G_OBJECT (decompressor), "file-info");
400 }
401 #endif /* !G_OS_WIN32 || ZLIB >= 1.2.4 */
402  
403 if (res == Z_STREAM_END)
404 return G_CONVERTER_FINISHED;
405 return G_CONVERTER_CONVERTED;
406 }
407  
408 static void
409 g_zlib_decompressor_iface_init (GConverterIface *iface)
410 {
411 iface->convert = g_zlib_decompressor_convert;
412 iface->reset = g_zlib_decompressor_reset;
413 }