/* GdkPixbuf library - Main loading interface. * * Copyright (C) 1999 The Free Software Foundation * * Authors: Miguel de Icaza * Federico Mena-Quintero * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include "gdk-pixbuf-io.h" static gboolean pixbuf_check_png (guchar *buffer, int size) { if (size < 28) return FALSE; if (buffer [0] != 0x89 || buffer [1] != 'P' || buffer [2] != 'N' || buffer [3] != 'G' || buffer [4] != 0x0d || buffer [5] != 0x0a || buffer [6] != 0x1a || buffer [7] != 0x0a) return FALSE; return TRUE; } static gboolean pixbuf_check_jpeg (guchar *buffer, int size) { if (size < 10) return FALSE; if (buffer [0] != 0xff || buffer [1] != 0xd8) return FALSE; return TRUE; } static gboolean pixbuf_check_tiff (guchar *buffer, int size) { if (size < 10) return FALSE; if (buffer [0] == 'M' && buffer [1] == 'M' && buffer [2] == 0 && buffer [3] == 0x2a) return TRUE; if (buffer [0] == 'I' && buffer [1] == 'I' && buffer [2] == 0x2a && buffer [3] == 0) return TRUE; return FALSE; } static gboolean pixbuf_check_gif (guchar *buffer, int size) { if (size < 20) return FALSE; if (strncmp (buffer, "GIF8", 4) == 0) return TRUE; return FALSE; } static gboolean pixbuf_check_xpm (guchar *buffer, int size) { if (size < 20) return FALSE; if (strncmp (buffer, "/* XPM */", 9) == 0) return TRUE; return FALSE; } #if 0 static gboolean pixbuf_check_bmp (guchar *buffer, int size) { if (size < 20) return FALSE; if (buffer [0] != 'B' || buffer [1] != 'M') return FALSE; return TRUE; } static gboolean pixbuf_check_ppm (guchar *buffer, int size) { if (size < 20) return FALSE; if (buffer [0] == 'P') { if (buffer [1] == '1' || buffer [1] == '2' || buffer [1] == '3' || buffer [1] == '4' || buffer [1] == '5' || buffer [1] == '6') return TRUE; } return FALSE; } #endif GdkPixbufModule file_formats [] = { { "png", pixbuf_check_png, NULL, NULL, NULL, NULL, NULL, NULL }, { "jpeg", pixbuf_check_jpeg, NULL, NULL, NULL, NULL, NULL, NULL }, { "tiff", pixbuf_check_tiff, NULL, NULL, NULL, NULL, NULL, NULL }, { "gif", pixbuf_check_gif, NULL, NULL, NULL, NULL, NULL, NULL }, #define XPM_FILE_FORMAT_INDEX 4 { "xpm", pixbuf_check_xpm, NULL, NULL, NULL, NULL, NULL, NULL }, #if 0 { "bmp", pixbuf_check_bmp, NULL, NULL, NULL, NULL, NULL, NULL }, { "ppm", pixbuf_check_ppm, NULL, NULL, NULL, NULL, NULL, NULL }, #endif { NULL, NULL, NULL, NULL, NULL, NULL, NULL } }; /* actually load the image handler - gdk_pixbuf_get_module only get a */ /* reference to the module to load, it doesn't actually load it */ /* perhaps these actions should be combined in one function */ void gdk_pixbuf_load_module (GdkPixbufModule *image_module) { char *module_name; char *path; GModule *module; gpointer load_sym; g_return_if_fail(image_module->module == NULL); module_name = g_strconcat ("pixbuf-", image_module->module_name, NULL); path = g_module_build_path (PIXBUF_LIBDIR, module_name); module = g_module_open (path, G_MODULE_BIND_LAZY); if (!module) { /* Debug feature, check in present working directory */ g_free(path); path = g_module_build_path("", module_name); module = g_module_open(path, G_MODULE_BIND_LAZY); if (!module) { g_warning ("Unable to load module: %s: %s", path, g_module_error()); g_free (module_name); g_free(path); return; } else { printf("loaded module `%s'\n", module_name); } g_free(path); } else { printf("loaded module `%s'\n", path); g_free (path); } g_free (module_name); image_module->module = module; if (g_module_symbol (module, "image_load", &load_sym)) image_module->load = load_sym; if (g_module_symbol (module, "image_load_xpm_data", &load_sym)) image_module->load_xpm_data = load_sym; if (g_module_symbol (module, "image_begin_load", &load_sym)) image_module->begin_load = load_sym; if (g_module_symbol (module, "image_stop_load", &load_sym)) image_module->stop_load = load_sym; if (g_module_symbol (module, "image_load_increment", &load_sym)) image_module->load_increment = load_sym; } GdkPixbufModule * gdk_pixbuf_get_module (gchar *buffer, gint size) { gint i; for (i = 0; file_formats [i].module_name; i++) { if ((* file_formats [i].format_check) (buffer, size)) return &(file_formats[i]); } return NULL; } GdkPixbuf * gdk_pixbuf_new_from_file (const char *filename) { GdkPixbuf *pixbuf; gint size; FILE *f; char buffer [128]; GdkPixbufModule *image_module; f = fopen (filename, "r"); if (!f) return NULL; size = fread (&buffer, 1, sizeof (buffer), f); if (size == 0) { fclose (f); return NULL; } image_module = gdk_pixbuf_get_module (buffer, size); if (image_module){ if (image_module->module == NULL) gdk_pixbuf_load_module (image_module); if (image_module->load == NULL) { fclose (f); return NULL; } fseek (f, 0, SEEK_SET); pixbuf = (* image_module->load) (f); fclose (f); if (pixbuf) g_assert (pixbuf->ref_count != 0); return pixbuf; } else { g_warning ("Unable to find handler for file: %s", filename); } fclose (f); return NULL; } GdkPixbuf * gdk_pixbuf_new_from_xpm_data (const gchar **data) { GdkPixbuf *(* load_xpm_data) (const gchar **data); GdkPixbuf *pixbuf; if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL) { gdk_pixbuf_load_module(&file_formats[XPM_FILE_FORMAT_INDEX]); } if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL) { g_warning("Can't find gdk-pixbuf module for parsing inline XPM data"); return NULL; } else if (file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data == NULL) { g_warning("gdk-pixbuf XPM module lacks XPM data capability"); return NULL; } else { load_xpm_data = file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data; } pixbuf = load_xpm_data(data); return pixbuf; }