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PIKApp/libpikathumb/pikathumb-utils.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* Thumbnail handling according to the Thumbnail Managing Standard.
* https://specifications.freedesktop.org/thumbnail-spec/
*
* Copyright (C) 2001-2003 Sven Neumann <sven@gimp.org>
* Michael Natterer <mitch@gimp.org>
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#ifdef PLATFORM_OSX
#include <AppKit/AppKit.h>
#endif
#include <gio/gio.h>
#include <glib/gstdio.h>
#ifdef G_OS_WIN32
#include "libpikabase/pikawin32-io.h"
#endif
#include "pikathumb-error.h"
#include "pikathumb-types.h"
#include "pikathumb-utils.h"
#include "libpika/libpika-intl.h"
/**
* SECTION: pikathumb-utils
* @title: PikaThumb-utils
* @short_description: Utility functions provided and used by libpikathumb
*
* Utility functions provided and used by libpikathumb
**/
static gint pika_thumb_size (PikaThumbSize size);
static gchar * pika_thumb_png_lookup (const gchar *name,
const gchar *basedir,
PikaThumbSize *size) G_GNUC_MALLOC;
static const gchar * pika_thumb_png_name (const gchar *uri);
static void pika_thumb_exit (void);
static gboolean pika_thumb_initialized = FALSE;
static gint thumb_num_sizes = 0;
static gint *thumb_sizes = NULL;
static const gchar **thumb_sizenames = NULL;
static gchar *thumb_dir = NULL;
static gchar **thumb_subdirs = NULL;
static gchar *thumb_fail_subdir = NULL;
/**
* pika_thumb_init:
* @creator: an ASCII string that identifies the thumbnail creator
* @thumb_basedir: an absolute path or %NULL to use the default
*
* This function initializes the thumbnail system. It must be called
* before any other functions from libpikathumb are used. You may call
* it more than once if you want to change the @thumb_basedir but if
* you do that, you should make sure that no thread is still using the
* library. Apart from this function, libpikathumb is multi-thread
* safe.
*
* The @creator string must be 7bit ASCII and should contain the name
* of the software that creates the thumbnails. It is used to handle
* thumbnail creation failures. See the spec for more details.
*
* Usually you will pass %NULL for @thumb_basedir. Thumbnails will
* then be stored in the user's personal thumbnail directory as
* defined in the spec. If you wish to use libpikathumb to store
* application-specific thumbnails, you can specify a different base
* directory here.
*
* Returns: %TRUE if the library was successfully initialized.
**/
gboolean
pika_thumb_init (const gchar *creator,
const gchar *thumb_basedir)
{
GEnumClass *enum_class;
GEnumValue *enum_value;
guint i;
g_return_val_if_fail (creator != NULL, FALSE);
g_return_val_if_fail (thumb_basedir == NULL ||
g_path_is_absolute (thumb_basedir), FALSE);
if (pika_thumb_initialized)
pika_thumb_exit ();
if (thumb_basedir)
{
thumb_dir = g_strdup (thumb_basedir);
}
else
{
#ifdef PLATFORM_OSX
NSAutoreleasePool *pool;
NSArray *path;
NSString *cache_dir;
pool = [[NSAutoreleasePool alloc] init];
path = NSSearchPathForDirectoriesInDomains (NSCachesDirectory,
NSUserDomainMask, YES);
cache_dir = [path objectAtIndex:0];
thumb_dir = g_build_filename ([cache_dir UTF8String], "org.freedesktop.thumbnails",
NULL);
[pool drain];
#else
const gchar *cache_dir = g_get_user_cache_dir ();
if (cache_dir && g_file_test (cache_dir, G_FILE_TEST_IS_DIR))
{
thumb_dir = g_build_filename (cache_dir, "thumbnails", NULL);
}
#endif
if (! thumb_dir)
{
gchar *name = g_filename_display_name (g_get_tmp_dir ());
g_message (_("Cannot determine a valid thumbnails directory.\n"
"Thumbnails will be stored in the folder for "
"temporary files (%s) instead."), name);
g_free (name);
thumb_dir = g_build_filename (g_get_tmp_dir (), ".thumbnails", NULL);
}
}
enum_class = g_type_class_ref (PIKA_TYPE_THUMB_SIZE);
thumb_num_sizes = enum_class->n_values;
thumb_sizes = g_new (gint, thumb_num_sizes);
thumb_sizenames = g_new (const gchar *, thumb_num_sizes);
thumb_subdirs = g_new (gchar *, thumb_num_sizes);
for (i = 0, enum_value = enum_class->values;
i < enum_class->n_values;
i++, enum_value++)
{
thumb_sizes[i] = enum_value->value;
thumb_sizenames[i] = enum_value->value_nick;
thumb_subdirs[i] = g_build_filename (thumb_dir,
enum_value->value_nick, NULL);
}
thumb_fail_subdir = thumb_subdirs[0];
thumb_subdirs[0] = g_build_filename (thumb_fail_subdir, creator, NULL);
g_type_class_unref (enum_class);
pika_thumb_initialized = TRUE;
return pika_thumb_initialized;
}
/**
* pika_thumb_get_thumb_base_dir:
*
* Returns the base directory of thumbnails cache.
* It uses the Freedesktop Thumbnail Managing Standard on UNIX,
* "~/Library/Caches/org.freedesktop.thumbnails" on OSX, and a cache
* folder determined by glib on Windows (currently the common repository
* for temporary Internet files).
* The returned string belongs to PIKA and must not be changed nor freed.
*
* Returns: the thumbnails cache directory.
*
* Since: 2.10
**/
const gchar *
pika_thumb_get_thumb_base_dir (void)
{
g_return_val_if_fail (pika_thumb_initialized, NULL);
return thumb_dir;
}
/**
* pika_thumb_get_thumb_dir:
* @size: a PikaThumbSize
*
* Retrieve the name of the thumbnail folder for a specific size. The
* returned pointer will become invalid if pika_thumb_init() is used
* again. It must not be changed or freed.
*
* Returns: the thumbnail directory in the encoding of the filesystem
**/
const gchar *
pika_thumb_get_thumb_dir (PikaThumbSize size)
{
g_return_val_if_fail (pika_thumb_initialized, NULL);
size = pika_thumb_size (size);
return thumb_subdirs[size];
}
/**
* pika_thumb_get_thumb_dir_local:
* @dirname: the basename of the dir, without the actual dirname itself
* @size: a PikaThumbSize
*
* Retrieve the name of the local thumbnail folder for a specific
* size. Unlike pika_thumb_get_thumb_dir() the returned string is not
* constant and should be free'd when it is not any longer needed.
*
* Returns: the thumbnail directory in the encoding of the filesystem
*
* Since: 2.2
**/
gchar *
pika_thumb_get_thumb_dir_local (const gchar *dirname,
PikaThumbSize size)
{
g_return_val_if_fail (pika_thumb_initialized, NULL);
g_return_val_if_fail (dirname != NULL, NULL);
g_return_val_if_fail (size > PIKA_THUMB_SIZE_FAIL, NULL);
size = pika_thumb_size (size);
return g_build_filename (dirname, thumb_sizenames[size], NULL);
}
/**
* pika_thumb_ensure_thumb_dir:
* @size: a PikaThumbSize
* @error: return location for possible errors
*
* This function checks if the directory that is required to store
* thumbnails for a particular @size exist and attempts to create it
* if necessary.
*
* You shouldn't have to call this function directly since
* pika_thumbnail_save_thumb() and pika_thumbnail_save_failure() will
* do this for you.
*
* Returns: %TRUE is the directory exists, %FALSE if it could not
* be created
**/
gboolean
pika_thumb_ensure_thumb_dir (PikaThumbSize size,
GError **error)
{
g_return_val_if_fail (pika_thumb_initialized, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
size = pika_thumb_size (size);
if (g_file_test (thumb_subdirs[size], G_FILE_TEST_IS_DIR))
return TRUE;
if (g_file_test (thumb_dir, G_FILE_TEST_IS_DIR) ||
(g_mkdir_with_parents (thumb_dir, S_IRUSR | S_IWUSR | S_IXUSR) == 0))
{
if (size == 0)
g_mkdir_with_parents (thumb_fail_subdir, S_IRUSR | S_IWUSR | S_IXUSR);
g_mkdir_with_parents (thumb_subdirs[size], S_IRUSR | S_IWUSR | S_IXUSR);
}
if (g_file_test (thumb_subdirs[size], G_FILE_TEST_IS_DIR))
return TRUE;
g_set_error (error,
PIKA_THUMB_ERROR, PIKA_THUMB_ERROR_MKDIR,
_("Failed to create thumbnail folder '%s'."),
thumb_subdirs[size]);
return FALSE;
}
/**
* pika_thumb_ensure_thumb_dir_local:
* @dirname: the basename of the dir, without the actual dirname itself
* @size: a PikaThumbSize
* @error: return location for possible errors
*
* This function checks if the directory that is required to store
* local thumbnails for a particular @size exist and attempts to
* create it if necessary.
*
* You shouldn't have to call this function directly since
* pika_thumbnail_save_thumb_local() will do this for you.
*
* Returns: %TRUE is the directory exists, %FALSE if it could not
* be created
*
* Since: 2.2
**/
gboolean
pika_thumb_ensure_thumb_dir_local (const gchar *dirname,
PikaThumbSize size,
GError **error)
{
gchar *basedir;
gchar *subdir;
g_return_val_if_fail (pika_thumb_initialized, FALSE);
g_return_val_if_fail (dirname != NULL, FALSE);
g_return_val_if_fail (g_path_is_absolute (dirname), FALSE);
g_return_val_if_fail (size > PIKA_THUMB_SIZE_FAIL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
size = pika_thumb_size (size);
subdir = g_build_filename (dirname,
".thumblocal", thumb_sizenames[size],
NULL);
if (g_file_test (subdir, G_FILE_TEST_IS_DIR))
{
g_free (subdir);
return TRUE;
}
basedir = g_build_filename (dirname, ".thumblocal", NULL);
if (g_file_test (basedir, G_FILE_TEST_IS_DIR) ||
(g_mkdir (thumb_dir, S_IRUSR | S_IWUSR | S_IXUSR) == 0))
{
g_mkdir (subdir, S_IRUSR | S_IWUSR | S_IXUSR);
}
g_free (basedir);
if (g_file_test (subdir, G_FILE_TEST_IS_DIR))
{
g_free (subdir);
return TRUE;
}
g_set_error (error,
PIKA_THUMB_ERROR, PIKA_THUMB_ERROR_MKDIR,
_("Failed to create thumbnail folder '%s'."),
subdir);
g_free (subdir);
return FALSE;
}
/**
* pika_thumb_name_from_uri:
* @uri: an escaped URI
* @size: a #PikaThumbSize
*
* Creates the name of the thumbnail file of the specified @size that
* belongs to an image file located at the given @uri.
*
* Returns: a newly allocated filename in the encoding of the
* filesystem or %NULL if @uri points to the user's
* thumbnail repository.
**/
gchar *
pika_thumb_name_from_uri (const gchar *uri,
PikaThumbSize size)
{
g_return_val_if_fail (pika_thumb_initialized, NULL);
g_return_val_if_fail (uri != NULL, NULL);
if (strstr (uri, thumb_dir))
return NULL;
size = pika_thumb_size (size);
return g_build_filename (thumb_subdirs[size],
pika_thumb_png_name (uri),
NULL);
}
/**
* pika_thumb_name_from_uri_local:
* @uri: an escaped URI
* @size: a #PikaThumbSize
*
* Creates the name of a local thumbnail file of the specified @size
* that belongs to an image file located at the given @uri. Local
* thumbnails have been introduced with version 0.7 of the spec.
*
* Returns: a newly allocated filename in the encoding of the
* filesystem or %NULL if @uri is a remote file or
* points to the user's thumbnail repository.
*
* Since: 2.2
**/
gchar *
pika_thumb_name_from_uri_local (const gchar *uri,
PikaThumbSize size)
{
gchar *filename;
gchar *result = NULL;
g_return_val_if_fail (pika_thumb_initialized, NULL);
g_return_val_if_fail (uri != NULL, NULL);
g_return_val_if_fail (size > PIKA_THUMB_SIZE_FAIL, NULL);
if (strstr (uri, thumb_dir))
return NULL;
filename = _pika_thumb_filename_from_uri (uri);
if (filename)
{
const gchar *baseuri = strrchr (uri, '/');
if (baseuri && baseuri[0] && baseuri[1])
{
gchar *dirname = g_path_get_dirname (filename);
gint i = pika_thumb_size (size);
result = g_build_filename (dirname,
".thumblocal", thumb_sizenames[i],
pika_thumb_png_name (uri),
NULL);
g_free (dirname);
}
g_free (filename);
}
return result;
}
/**
* pika_thumb_find_thumb:
* @uri: an escaped URI
* @size: pointer to a #PikaThumbSize
*
* This function attempts to locate a thumbnail for the given
* @uri. First it tries the size that is stored at @size. If no
* thumbnail of that size is found, it will look for a larger
* thumbnail, then falling back to a smaller size.
*
* If the user's thumbnail repository doesn't provide a thumbnail but
* a local thumbnail repository exists for the folder the image is
* located in, the same search is done among the local thumbnails (if
* there are any).
*
* If a thumbnail is found, it's size is written to the variable
* pointer to by @size and the file location is returned.
*
* Returns: a newly allocated string in the encoding of the
* filesystem or %NULL if no thumbnail for @uri was found
**/
gchar *
pika_thumb_find_thumb (const gchar *uri,
PikaThumbSize *size)
{
gchar *result;
g_return_val_if_fail (pika_thumb_initialized, NULL);
g_return_val_if_fail (uri != NULL, NULL);
g_return_val_if_fail (size != NULL, NULL);
g_return_val_if_fail (*size > PIKA_THUMB_SIZE_FAIL, NULL);
result = pika_thumb_png_lookup (pika_thumb_png_name (uri), NULL, size);
if (! result)
{
gchar *filename = _pika_thumb_filename_from_uri (uri);
if (filename)
{
const gchar *baseuri = strrchr (uri, '/');
if (baseuri && baseuri[0] && baseuri[1])
{
gchar *dirname = g_path_get_dirname (filename);
result = pika_thumb_png_lookup (pika_thumb_png_name (baseuri + 1),
dirname, size);
g_free (dirname);
}
g_free (filename);
}
}
return result;
}
/**
* pika_thumb_file_test:
* @filename: a filename in the encoding of the filesystem
* @mtime: return location for modification time
* @size: return location for file size
* @err_no: return location for system "errno"
*
* This is a convenience and portability wrapper around stat(). It
* checks if the given @filename exists and returns modification time
* and file size in 64bit integer values.
*
* Returns: The type of the file, or #PIKA_THUMB_FILE_TYPE_NONE if
* the file doesn't exist.
**/
PikaThumbFileType
pika_thumb_file_test (const gchar *filename,
gint64 *mtime,
gint64 *size,
gint *err_no)
{
PikaThumbFileType type = PIKA_THUMB_FILE_TYPE_NONE;
GFile *file;
GFileInfo *info;
g_return_val_if_fail (filename != NULL, FALSE);
file = g_file_new_for_path (filename);
info = g_file_query_info (file,
G_FILE_ATTRIBUTE_STANDARD_TYPE ","
G_FILE_ATTRIBUTE_STANDARD_SIZE ","
G_FILE_ATTRIBUTE_TIME_MODIFIED,
G_FILE_QUERY_INFO_NONE,
NULL, NULL);
if (info)
{
if (mtime)
*mtime =
g_file_info_get_attribute_uint64 (info,
G_FILE_ATTRIBUTE_TIME_MODIFIED);
if (size)
*size = g_file_info_get_size (info);
if (err_no)
*err_no = 0;
switch (g_file_info_get_attribute_uint32 (info,
G_FILE_ATTRIBUTE_STANDARD_TYPE))
{
case G_FILE_TYPE_REGULAR:
type = PIKA_THUMB_FILE_TYPE_REGULAR;
break;
case G_FILE_TYPE_DIRECTORY:
type = PIKA_THUMB_FILE_TYPE_FOLDER;
break;
default:
type = PIKA_THUMB_FILE_TYPE_SPECIAL;
break;
}
g_object_unref (info);
}
else
{
if (mtime) *mtime = 0;
if (size) *size = 0;
if (err_no) *err_no = ENOENT;
}
g_object_unref (file);
return type;
}
/**
* pika_thumbs_delete_for_uri:
* @uri: an escaped URI
*
* Deletes all thumbnails for the image file specified by @uri from the
* user's thumbnail repository.
*
* Since: 2.2
**/
void
pika_thumbs_delete_for_uri (const gchar *uri)
{
gint i;
g_return_if_fail (pika_thumb_initialized);
g_return_if_fail (uri != NULL);
for (i = 0; i < thumb_num_sizes; i++)
{
gchar *filename = pika_thumb_name_from_uri (uri, thumb_sizes[i]);
if (filename)
{
g_unlink (filename);
g_free (filename);
}
}
}
/**
* pika_thumbs_delete_for_uri_local:
* @uri: an escaped URI
*
* Deletes all thumbnails for the image file specified by @uri from
* the local thumbnail repository.
*
* Since: 2.2
**/
void
pika_thumbs_delete_for_uri_local (const gchar *uri)
{
gint i;
g_return_if_fail (pika_thumb_initialized);
g_return_if_fail (uri != NULL);
for (i = 0; i < thumb_num_sizes; i++)
{
gchar *filename = pika_thumb_name_from_uri_local (uri, thumb_sizes[i]);
if (filename)
{
g_unlink (filename);
g_free (filename);
}
}
}
void
_pika_thumbs_delete_others (const gchar *uri,
PikaThumbSize size)
{
gint i;
g_return_if_fail (pika_thumb_initialized);
g_return_if_fail (uri != NULL);
size = pika_thumb_size (size);
for (i = 0; i < thumb_num_sizes; i++)
{
gchar *filename;
if (i == size)
continue;
filename = pika_thumb_name_from_uri (uri, thumb_sizes[i]);
if (filename)
{
g_unlink (filename);
g_free (filename);
}
}
}
gchar *
_pika_thumb_filename_from_uri (const gchar *uri)
{
gchar *filename;
gchar *hostname;
g_return_val_if_fail (uri != NULL, NULL);
filename = g_filename_from_uri (uri, &hostname, NULL);
if (!filename)
return NULL;
if (hostname)
{
/* we have a file: URI with a hostname */
#ifdef G_OS_WIN32
/* on Win32, create a valid UNC path and use it as the filename */
gchar *tmp = g_build_filename ("//", hostname, filename, NULL);
g_free (filename);
filename = tmp;
#else
/* otherwise return NULL, caller should use URI then */
g_free (filename);
filename = NULL;
#endif
g_free (hostname);
}
return filename;
}
static void
pika_thumb_exit (void)
{
gint i;
g_free (thumb_dir);
g_free (thumb_sizes);
g_free (thumb_sizenames);
for (i = 0; i < thumb_num_sizes; i++)
g_free (thumb_subdirs[i]);
g_free (thumb_subdirs);
g_free (thumb_fail_subdir);
thumb_num_sizes = 0;
thumb_sizes = NULL;
thumb_sizenames = NULL;
thumb_dir = NULL;
thumb_subdirs = NULL;
thumb_fail_subdir = NULL;
pika_thumb_initialized = FALSE;
}
static gint
pika_thumb_size (PikaThumbSize size)
{
gint i = 0;
if (size > PIKA_THUMB_SIZE_FAIL)
{
for (i = 1;
i < thumb_num_sizes && thumb_sizes[i] < size;
i++)
/* nothing */;
if (i == thumb_num_sizes)
i--;
}
return i;
}
static gchar *
pika_thumb_png_lookup (const gchar *name,
const gchar *basedir,
PikaThumbSize *size)
{
gchar *thumb_name = NULL;
gchar **subdirs = NULL;
gint i, n;
if (basedir)
{
gchar *dir = g_build_filename (basedir, ".thumblocal", NULL);
if (g_file_test (basedir, G_FILE_TEST_IS_DIR))
{
gint i;
subdirs = g_new (gchar *, thumb_num_sizes);
subdirs[0] = NULL; /* PIKA_THUMB_SIZE_FAIL */
for (i = 1; i < thumb_num_sizes; i++)
subdirs[i] = g_build_filename (dir, thumb_sizenames[i], NULL);
}
g_free (dir);
}
else
{
subdirs = thumb_subdirs;
}
if (! subdirs)
return NULL;
i = n = pika_thumb_size (*size);
for (; i < thumb_num_sizes; i++)
{
if (! subdirs[i])
continue;
thumb_name = g_build_filename (subdirs[i], name, NULL);
if (pika_thumb_file_test (thumb_name,
NULL, NULL,
NULL) == PIKA_THUMB_FILE_TYPE_REGULAR)
{
*size = thumb_sizes[i];
goto finish;
}
g_free (thumb_name);
}
for (i = n - 1; i >= 0; i--)
{
if (! subdirs[i])
continue;
thumb_name = g_build_filename (subdirs[i], name, NULL);
if (pika_thumb_file_test (thumb_name,
NULL, NULL,
NULL) == PIKA_THUMB_FILE_TYPE_REGULAR)
{
*size = thumb_sizes[i];
goto finish;
}
g_free (thumb_name);
}
thumb_name = NULL;
finish:
if (basedir)
{
for (i = 0; i < thumb_num_sizes; i++)
g_free (subdirs[i]);
g_free (subdirs);
}
return thumb_name;
}
static const gchar *
pika_thumb_png_name (const gchar *uri)
{
static gchar name[40];
GChecksum *checksum;
guchar digest[16];
gsize len = sizeof (digest);
gsize i;
checksum = g_checksum_new (G_CHECKSUM_MD5);
g_checksum_update (checksum, (const guchar *) uri, -1);
g_checksum_get_digest (checksum, digest, &len);
g_checksum_free (checksum);
for (i = 0; i < len; i++)
{
guchar n;
n = (digest[i] >> 4) & 0xF;
name[i * 2] = (n > 9) ? 'a' + n - 10 : '0' + n;
n = digest[i] & 0xF;
name[i * 2 + 1] = (n > 9) ? 'a' + n - 10 : '0' + n;
}
strncpy (name + 32, ".png", 5);
return (const gchar *) name;
}
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