src/image-load-cr3.cc

   1 /*
   2  * Copyright (C) 2020 The Geeqie Team
   3  *
   4  * Authors: Colin Clark
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 /** This is a Will Not Fix */
  22 #pragma GCC diagnostic ignored "-Wclobbered"
  23
  24 #include "image-load-cr3.h"
  25
  26 #include <cstring>
  27
  28 #include <glib.h>
  29
  30 #include "image-load-jpeg.h"
  31 #include "image-load.h"
  32
  33 namespace
  34 {
  35
  36 struct ImageLoaderCr3 : public ImageLoaderJpeg
  37 {
  38 public:
  39         gboolean write(const guchar *buf, gsize &chunk_size, gsize count, GError **error) override;
  40         gchar *get_format_name() override;
  41         gchar **get_format_mime_types() override;
  42 };
  43
  44 gboolean ImageLoaderCr3::write(const guchar *buf, gsize &chunk_size, gsize count, GError **error)
  45 {
  46         /** @FIXME Just start search at where full size jpeg should be,
  47          * then search through the file looking for a jpeg end-marker
  48          */
  49         gboolean found = FALSE;
  50         gint i;
  51         guint n;
  52
  53         n = 0;
  54         while (n < count - 4 && !found)
  55                 {
  56                 if (memcmp(&buf[n], "mdat", 4) == 0)
  57                         {
  58                         if (memcmp(&buf[n + 12], "\xFF\xD8", 2) == 0)
  59                                 {
  60                                 i = 0;
  61                                 while (!found )
  62                                         {
  63                                         if (memcmp(&buf[n + 12 + i], "\xFF\xD9", 2) == 0)
  64                                                 {
  65                                                 found = TRUE;
  66                                                 }
  67                                         i++;
  68                                         }
  69                                 }
  70                         else
  71                                 {
  72                                 break;
  73                                 }
  74                         }
  75                 else
  76                         {
  77                         n++;
  78                         }
  79                 }
  80
  81         if (!found)
  82                 {
  83                 return FALSE;
  84                 }
  85
  86         gboolean ret = ImageLoaderJpeg::write(buf + n + 12, chunk_size, i, error);
  87         if (ret)
  88                 {
  89                 chunk_size = count;
  90                 }
  91         return ret;
  92 }
  93
  94 gchar *ImageLoaderCr3::get_format_name()
  95 {
  96         return g_strdup("cr3");
  97 }
  98
  99 gchar **ImageLoaderCr3::get_format_mime_types()
 100 {
 101         static const gchar *mime[] = {"image/x-canon-cr3", nullptr};
 102         return g_strdupv(const_cast<gchar **>(mime));
 103 }
 104
 105 } // namespace
 106
 107 std::unique_ptr<ImageLoaderBackend> get_image_loader_backend_cr3()
 108 {
 109         return std::make_unique<ImageLoaderCr3>();
 110 }
 111
 112 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */