/* gtkiconcache.c * Copyright (C) 2004 Anders Carlsson * * 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 "gtkdebug.h" #include "gtkiconcache.h" #include #ifdef HAVE_MMAP #include #endif #ifdef G_OS_WIN32 #include #include #endif #include #include #ifdef HAVE_UNISTD_H #include #endif #include #include #ifndef _O_BINARY #define _O_BINARY 0 #endif #define MAJOR_VERSION 1 #define MINOR_VERSION 0 #define GET_UINT16(cache, offset) (GUINT16_FROM_BE (*(guint16 *)((cache) + (offset)))) #define GET_UINT32(cache, offset) (GUINT32_FROM_BE (*(guint32 *)((cache) + (offset)))) struct _GtkIconCache { gint ref_count; gsize size; gchar *buffer; #ifdef G_OS_WIN32 HANDLE handle; #endif }; GtkIconCache * _gtk_icon_cache_ref (GtkIconCache *cache) { cache->ref_count ++; return cache; } void _gtk_icon_cache_unref (GtkIconCache *cache) { cache->ref_count --; if (cache->ref_count == 0) { GTK_NOTE (ICONTHEME, g_print ("unmapping icon cache\n")); #ifdef HAVE_MMAP munmap (cache->buffer, cache->size); #endif #ifdef G_OS_WIN32 UnmapViewOfFile (cache->buffer); CloseHandle (cache->handle); #endif g_free (cache); } } GtkIconCache * _gtk_icon_cache_new_for_path (const gchar *path) { GtkIconCache *cache = NULL; #if defined(HAVE_MMAP) || defined(G_OS_WIN32) gchar *cache_filename; gint fd = -1; struct stat st; struct stat path_st; gchar *buffer = NULL; #ifdef G_OS_WIN32 HANDLE handle = NULL; #endif if (g_getenv ("GTK_NO_ICON_CACHE")) return NULL; /* Check if we have a cache file */ cache_filename = g_build_filename (path, "icon-theme.cache", NULL); GTK_NOTE (ICONTHEME, g_print ("look for cache in %s\n", path)); if (!g_file_test (cache_filename, G_FILE_TEST_IS_REGULAR)) goto done; if (g_stat (path, &path_st) < 0) goto done; /* Open the file and map it into memory */ fd = g_open (cache_filename, O_RDONLY|_O_BINARY, 0); if (fd < 0) { g_free (cache_filename); return NULL; } if (fstat (fd, &st) < 0 || st.st_size < 4) goto done; /* Verify cache is uptodate */ if (st.st_mtime < path_st.st_mtime) { GTK_NOTE (ICONTHEME, g_print ("cache outdated\n")); goto done; } #ifndef G_OS_WIN32 buffer = (gchar *) mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0); if (buffer == MAP_FAILED) goto done; #else handle = CreateFileMapping (_get_osfhandle (fd), NULL, PAGE_READONLY, 0, 0, NULL); if (handle == NULL) goto done; buffer = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, 0); if (buffer == NULL) { CloseHandle (handle); goto done; } #endif /* Verify version */ if (GET_UINT16 (buffer, 0) != MAJOR_VERSION || GET_UINT16 (buffer, 2) != MINOR_VERSION) { #ifndef G_OS_WIN32 munmap (buffer, st.st_size); #else UnmapViewOfFile (buffer); CloseHandle (handle); #endif GTK_NOTE (ICONTHEME, g_print ("wrong cache version\n")); goto done; } GTK_NOTE (ICONTHEME, g_print ("found cache for %s\n", path)); cache = g_new0 (GtkIconCache, 1); cache->ref_count = 1; cache->buffer = buffer; #ifdef G_OS_WIN32 cache->handle = handle; #endif cache->size = st.st_size; done: g_free (cache_filename); if (fd != -1) close (fd); #endif /* HAVE_MMAP || G_OS_WIN32 */ return cache; } static int get_directory_index (GtkIconCache *cache, const gchar *directory) { guint32 dir_list_offset; int n_dirs; int i; dir_list_offset = GET_UINT32 (cache->buffer, 8); n_dirs = GET_UINT32 (cache->buffer, dir_list_offset); for (i = 0; i < n_dirs; i++) { guint32 name_offset = GET_UINT32 (cache->buffer, dir_list_offset + 4 + 4 * i); gchar *name = cache->buffer + name_offset; if (strcmp (name, directory) == 0) return i; } return -1; } gboolean _gtk_icon_cache_has_directory (GtkIconCache *cache, const gchar *directory) { return get_directory_index (cache, directory) != -1; } static guint icon_name_hash (gconstpointer key) { const char *p = key; guint h = *p; if (h) for (p += 1; *p != '\0'; p++) h = (h << 5) - h + *p; return h; } gint _gtk_icon_cache_get_icon_flags (GtkIconCache *cache, const gchar *icon_name, const gchar *directory) { guint32 hash_offset; guint32 n_buckets; guint32 chain_offset; int hash, directory_index; guint32 image_list_offset, n_images; gboolean found = FALSE; int i; hash_offset = GET_UINT32 (cache->buffer, 4); n_buckets = GET_UINT32 (cache->buffer, hash_offset); hash = icon_name_hash (icon_name) % n_buckets; chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash); while (chain_offset != 0xffffffff) { guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4); gchar *name = cache->buffer + name_offset; if (strcmp (name, icon_name) == 0) { found = TRUE; break; } chain_offset = GET_UINT32 (cache->buffer, chain_offset); } if (!found) return 0; /* We've found an icon list, now check if we have the right icon in it */ directory_index = get_directory_index (cache, directory); image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8); n_images = GET_UINT32 (cache->buffer, image_list_offset); for (i = 0; i < n_images; i++) { if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * i) == directory_index) return GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * i + 2); } return 0; } void _gtk_icon_cache_add_icons (GtkIconCache *cache, const gchar *directory, GHashTable *hash_table) { int directory_index; guint32 hash_offset, n_buckets; guint32 chain_offset; guint32 image_list_offset, n_images; int i, j; directory_index = get_directory_index (cache, directory); if (directory_index == -1) return; hash_offset = GET_UINT32 (cache->buffer, 4); n_buckets = GET_UINT32 (cache->buffer, hash_offset); for (i = 0; i < n_buckets; i++) { chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * i); while (chain_offset != 0xffffffff) { guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4); gchar *name = cache->buffer + name_offset; image_list_offset = GET_UINT32 (cache->buffer, chain_offset + 8); n_images = GET_UINT32 (cache->buffer, image_list_offset); for (j = 0; j < n_images; j++) { if (GET_UINT16 (cache->buffer, image_list_offset + 4 + 8 * j) == directory_index) g_hash_table_insert (hash_table, name, NULL); } chain_offset = GET_UINT32 (cache->buffer, chain_offset); } } } gboolean _gtk_icon_cache_has_icon (GtkIconCache *cache, const gchar *icon_name) { guint32 hash_offset; guint32 n_buckets; guint32 chain_offset; gint hash; hash_offset = GET_UINT32 (cache->buffer, 4); n_buckets = GET_UINT32 (cache->buffer, hash_offset); hash = icon_name_hash (icon_name) % n_buckets; chain_offset = GET_UINT32 (cache->buffer, hash_offset + 4 + 4 * hash); while (chain_offset != 0xffffffff) { guint32 name_offset = GET_UINT32 (cache->buffer, chain_offset + 4); gchar *name = cache->buffer + name_offset; if (strcmp (name, icon_name) == 0) return TRUE; chain_offset = GET_UINT32 (cache->buffer, chain_offset); } return FALSE; }