gio/gzlibcompressor.c

   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, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gzlibcompressor.h"
  26
  27 #include <errno.h>
  28 #include <zlib.h>
  29 #include <string.h>
  30
  31 #include "gfileinfo.h"
  32 #include "gioerror.h"
  33 #include "gioenums.h"
  34 #include "gioenumtypes.h"
  35 #include "glibintl.h"
  36
  37
  38 enum {
  39   PROP_0,
  40   PROP_FORMAT,
  41   PROP_LEVEL,
  42   PROP_FILE_INFO
  43 };
  44
  45 /**
  46  * SECTION:gzcompressor
  47  * @short_description: Zlib compressor
  48  * @include: gio/gio.h
  49  *
  50  * #GZlibCompressor is an implementation of #GConverter that
  51  * compresses data using zlib.
  52  */
  53
  54 static void g_zlib_compressor_iface_init          (GConverterIface *iface);
  55
  56 /**
  57  * GZlibCompressor:
  58  *
  59  * Zlib decompression
  60  */
  61 struct _GZlibCompressor
  62 {
  63   GObject parent_instance;
  64
  65   GZlibCompressorFormat format;
  66   int level;
  67   z_stream zstream;
  68   gz_header gzheader;
  69   GFileInfo *file_info;
  70 };
  71
  72 static void
  73 g_zlib_compressor_set_gzheader (GZlibCompressor *compressor)
  74 {
  75   /* On win32, these functions were not exported before 1.2.4 */
  76 #if !defined (G_OS_WIN32) || ZLIB_VERNUM >= 0x1240
  77   const gchar *filename;
  78
  79   if (compressor->format != G_ZLIB_COMPRESSOR_FORMAT_GZIP ||
  80       compressor->file_info == NULL)
  81     return;
  82
  83   memset (&compressor->gzheader, 0, sizeof (gz_header));
  84   compressor->gzheader.os = 0x03; /* Unix */
  85
  86   filename = g_file_info_get_name (compressor->file_info);
  87   compressor->gzheader.name = (Bytef *) filename;
  88   compressor->gzheader.name_max = filename ? strlen (filename) + 1 : 0;
  89
  90   compressor->gzheader.time =
  91       (uLong) g_file_info_get_attribute_uint64 (compressor->file_info,
  92                                                 G_FILE_ATTRIBUTE_TIME_MODIFIED);
  93
  94   if (deflateSetHeader (&compressor->zstream, &compressor->gzheader) != Z_OK)
  95     g_warning ("unexpected zlib error: %s\n", compressor->zstream.msg);
  96 #endif /* !G_OS_WIN32 || ZLIB >= 1.2.4 */
  97 }
  98
  99 G_DEFINE_TYPE_WITH_CODE (GZlibCompressor, g_zlib_compressor, G_TYPE_OBJECT,
 100                          G_IMPLEMENT_INTERFACE (G_TYPE_CONVERTER,
 101                                                 g_zlib_compressor_iface_init))
 102
 103 static void
 104 g_zlib_compressor_finalize (GObject *object)
 105 {
 106   GZlibCompressor *compressor;
 107
 108   compressor = G_ZLIB_COMPRESSOR (object);
 109
 110   deflateEnd (&compressor->zstream);
 111
 112   if (compressor->file_info)
 113     g_object_unref (compressor->file_info);
 114
 115   G_OBJECT_CLASS (g_zlib_compressor_parent_class)->finalize (object);
 116 }
 117
 118
 119 static void
 120 g_zlib_compressor_set_property (GObject      *object,
 121                                   guint         prop_id,
 122                                   const GValue *value,
 123                                   GParamSpec   *pspec)
 124 {
 125   GZlibCompressor *compressor;
 126
 127   compressor = G_ZLIB_COMPRESSOR (object);
 128
 129   switch (prop_id)
 130     {
 131     case PROP_FORMAT:
 132       compressor->format = g_value_get_enum (value);
 133       break;
 134
 135     case PROP_LEVEL:
 136       compressor->level = g_value_get_int (value);
 137       break;
 138
 139     case PROP_FILE_INFO:
 140       g_zlib_compressor_set_file_info (compressor, g_value_get_object (value));
 141       break;
 142
 143     default:
 144       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 145       break;
 146     }
 147
 148 }
 149
 150 static void
 151 g_zlib_compressor_get_property (GObject    *object,
 152                                   guint       prop_id,
 153                                   GValue     *value,
 154                                   GParamSpec *pspec)
 155 {
 156   GZlibCompressor *compressor;
 157
 158   compressor = G_ZLIB_COMPRESSOR (object);
 159
 160   switch (prop_id)
 161     {
 162     case PROP_FORMAT:
 163       g_value_set_enum (value, compressor->format);
 164       break;
 165
 166     case PROP_LEVEL:
 167       g_value_set_int (value, compressor->level);
 168       break;
 169
 170     case PROP_FILE_INFO:
 171       g_value_set_object (value, compressor->file_info);
 172       break;
 173
 174     default:
 175       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 176       break;
 177     }
 178 }
 179
 180 static void
 181 g_zlib_compressor_init (GZlibCompressor *compressor)
 182 {
 183 }
 184
 185 static void
 186 g_zlib_compressor_constructed (GObject *object)
 187 {
 188   GZlibCompressor *compressor;
 189   int res;
 190
 191   compressor = G_ZLIB_COMPRESSOR (object);
 192
 193   if (compressor->format == G_ZLIB_COMPRESSOR_FORMAT_GZIP)
 194     {
 195       /* + 16 for gzip */
 196       res = deflateInit2 (&compressor->zstream,
 197                           compressor->level, Z_DEFLATED,
 198                           MAX_WBITS + 16, 8,
 199                           Z_DEFAULT_STRATEGY);
 200     }
 201   else if (compressor->format == G_ZLIB_COMPRESSOR_FORMAT_RAW)
 202     {
 203       /* negative wbits for raw */
 204       res = deflateInit2 (&compressor->zstream,
 205                           compressor->level, Z_DEFLATED,
 206                           -MAX_WBITS, 8,
 207                           Z_DEFAULT_STRATEGY);
 208     }
 209   else /* ZLIB */
 210     res = deflateInit (&compressor->zstream, compressor->level);
 211
 212   if (res == Z_MEM_ERROR )
 213     g_error ("GZlibCompressor: Not enough memory for zlib use");
 214
 215   if (res != Z_OK)
 216     g_warning ("unexpected zlib error: %s\n", compressor->zstream.msg);
 217
 218   g_zlib_compressor_set_gzheader (compressor);
 219 }
 220
 221 static void
 222 g_zlib_compressor_class_init (GZlibCompressorClass *klass)
 223 {
 224   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 225
 226   gobject_class->finalize = g_zlib_compressor_finalize;
 227   gobject_class->constructed = g_zlib_compressor_constructed;
 228   gobject_class->get_property = g_zlib_compressor_get_property;
 229   gobject_class->set_property = g_zlib_compressor_set_property;
 230
 231   g_object_class_install_property (gobject_class,
 232                                    PROP_FORMAT,
 233                                    g_param_spec_enum ("format",
 234                                                       P_("compression format"),
 235                                                       P_("The format of the compressed data"),
 236                                                       G_TYPE_ZLIB_COMPRESSOR_FORMAT,
 237                                                       G_ZLIB_COMPRESSOR_FORMAT_ZLIB,
 238                                                       G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 239                                                       G_PARAM_STATIC_STRINGS));
 240   g_object_class_install_property (gobject_class,
 241                                    PROP_LEVEL,
 242                                    g_param_spec_int ("level",
 243                                                      P_("compression level"),
 244                                                      P_("The level of compression from 0 (no compression) to 9 (most compression), -1 for the default level"),
 245                                                      -1, 9,
 246                                                      -1,
 247                                                      G_PARAM_READWRITE |
 248                                                      G_PARAM_CONSTRUCT_ONLY |
 249                                                      G_PARAM_STATIC_STRINGS));
 250
 251   /**
 252    * GZlibCompressor:file-info:
 253    *
 254    * If set to a non-%NULL #GFileInfo object, and #GZlibCompressor:format is
 255    * %G_ZLIB_COMPRESSOR_FORMAT_GZIP, the compressor will write the file name
 256    * and modification time from the file info to the GZIP header.
 257    *
 258    * Since: 2.26
 259    */
 260   g_object_class_install_property (gobject_class,
 261                                    PROP_FILE_INFO,
 262                                    g_param_spec_object ("file-info",
 263                                                        P_("file info"),
 264                                                        P_("File info"),
 265                                                        G_TYPE_FILE_INFO,
 266                                                        G_PARAM_READWRITE |
 267                                                        G_PARAM_STATIC_STRINGS));
 268 }
 269
 270 /**
 271  * g_zlib_compressor_new:
 272  * @format: The format to use for the compressed data
 273  * @level: compression level (0-9), -1 for default
 274  *
 275  * Creates a new #GZlibCompressor.
 276  *
 277  * Returns: a new #GZlibCompressor
 278  *
 279  * Since: 2.24
 280  **/
 281 GZlibCompressor *
 282 g_zlib_compressor_new (GZlibCompressorFormat format,
 283                        int level)
 284 {
 285   GZlibCompressor *compressor;
 286
 287   compressor = g_object_new (G_TYPE_ZLIB_COMPRESSOR,
 288                              "format", format,
 289                              "level", level,
 290                              NULL);
 291
 292   return compressor;
 293 }
 294
 295 /**
 296  * g_zlib_compressor_get_file_info:
 297  * @compressor: a #GZlibCompressor
 298  *
 299  * Returns the #GZlibCompressor:file-info property.
 300  *
 301  * Returns: (transfer none): a #GFileInfo, or %NULL
 302  *
 303  * Since: 2.26
 304  */
 305 GFileInfo *
 306 g_zlib_compressor_get_file_info (GZlibCompressor *compressor)
 307 {
 308   g_return_val_if_fail (G_IS_ZLIB_COMPRESSOR (compressor), NULL);
 309
 310   return compressor->file_info;
 311 }
 312
 313 /**
 314  * g_zlib_compressor_set_file_info:
 315  * @compressor: a #GZlibCompressor
 316  * @file_info: (allow-none): a #GFileInfo
 317  *
 318  * Sets @file_info in @compressor. If non-%NULL, and @compressor's
 319  * #GZlibCompressor:format property is %G_ZLIB_COMPRESSOR_FORMAT_GZIP,
 320  * it will be used to set the file name and modification time in
 321  * the GZIP header of the compressed data.
 322  *
 323  * Note: it is an error to call this function while a compression is in
 324  * progress; it may only be called immediately after creation of @compressor,
 325  * or after resetting it with g_converter_reset().
 326  *
 327  * Since: 2.26
 328  */
 329 void
 330 g_zlib_compressor_set_file_info (GZlibCompressor *compressor,
 331                                  GFileInfo       *file_info)
 332 {
 333   g_return_if_fail (G_IS_ZLIB_COMPRESSOR (compressor));
 334
 335   if (file_info == compressor->file_info)
 336     return;
 337
 338   if (compressor->file_info)
 339     g_object_unref (compressor->file_info);
 340   if (file_info)
 341     g_object_ref (file_info);
 342   compressor->file_info = file_info;
 343   g_object_notify (G_OBJECT (compressor), "file-info");
 344
 345   g_zlib_compressor_set_gzheader (compressor);
 346 }
 347
 348 static void
 349 g_zlib_compressor_reset (GConverter *converter)
 350 {
 351   GZlibCompressor *compressor = G_ZLIB_COMPRESSOR (converter);
 352   int res;
 353
 354   res = deflateReset (&compressor->zstream);
 355   if (res != Z_OK)
 356     g_warning ("unexpected zlib error: %s\n", compressor->zstream.msg);
 357
 358   /* deflateReset reset the header too, so re-set it */
 359   g_zlib_compressor_set_gzheader (compressor);
 360 }
 361
 362 static GConverterResult
 363 g_zlib_compressor_convert (GConverter *converter,
 364                            const void *inbuf,
 365                            gsize       inbuf_size,
 366                            void       *outbuf,
 367                            gsize       outbuf_size,
 368                            GConverterFlags flags,
 369                            gsize      *bytes_read,
 370                            gsize      *bytes_written,
 371                            GError    **error)
 372 {
 373   GZlibCompressor *compressor;
 374   int res;
 375   int flush;
 376
 377   compressor = G_ZLIB_COMPRESSOR (converter);
 378
 379   compressor->zstream.next_in = (void *)inbuf;
 380   compressor->zstream.avail_in = inbuf_size;
 381
 382   compressor->zstream.next_out = outbuf;
 383   compressor->zstream.avail_out = outbuf_size;
 384
 385   flush = Z_NO_FLUSH;
 386   if (flags & G_CONVERTER_INPUT_AT_END)
 387     flush = Z_FINISH;
 388   else if (flags & G_CONVERTER_FLUSH)
 389     flush = Z_SYNC_FLUSH;
 390
 391   res = deflate (&compressor->zstream, flush);
 392
 393   if (res == Z_MEM_ERROR)
 394     {
 395       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 396                            _("Not enough memory"));
 397       return G_CONVERTER_ERROR;
 398     }
 399
 400     if (res == Z_STREAM_ERROR)
 401     {
 402       g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
 403                    _("Internal error: %s"), compressor->zstream.msg);
 404       return G_CONVERTER_ERROR;
 405     }
 406
 407     if (res == Z_BUF_ERROR)
 408       {
 409         if (flags & G_CONVERTER_FLUSH)
 410           return G_CONVERTER_FLUSHED;
 411
 412         /* We do have output space, so this should only happen if we
 413            have no input but need some */
 414
 415         g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PARTIAL_INPUT,
 416                              _("Need more input"));
 417         return G_CONVERTER_ERROR;
 418       }
 419
 420   if (res == Z_OK || res == Z_STREAM_END)
 421     {
 422       *bytes_read = inbuf_size - compressor->zstream.avail_in;
 423       *bytes_written = outbuf_size - compressor->zstream.avail_out;
 424
 425       if (res == Z_STREAM_END)
 426         return G_CONVERTER_FINISHED;
 427       return G_CONVERTER_CONVERTED;
 428     }
 429
 430   g_assert_not_reached ();
 431 }
 432
 433 static void
 434 g_zlib_compressor_iface_init (GConverterIface *iface)
 435 {
 436   iface->convert = g_zlib_compressor_convert;
 437   iface->reset = g_zlib_compressor_reset;
 438 }