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gimp/libgimpthumb/gimpthumb-utils.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* Thumbnail handling according to the Thumbnail Managing Standard.
* http://triq.net/~pearl/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 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
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib-object.h>
#ifdef G_OS_WIN32
#include <libgimpbase/gimpwin32-io.h>
#endif
#include "libgimpmath/gimpmath.h"
#include "gimpthumb-error.h"
#include "gimpthumb-types.h"
#include "gimpthumb-utils.h"
#include "libgimp/libgimp-intl.h"
static const gchar * gimp_thumb_png_name (const gchar *uri);
static void gimp_thumb_exit (void);
static gboolean gimp_thumb_initialized = FALSE;
static gint thumb_num_sizes = 0;
static gint *thumb_sizes = NULL;
static gchar *thumb_dir = NULL;
static gchar **thumb_subdirs = NULL;
static gchar *thumb_fail_subdir = NULL;
gboolean
gimp_thumb_init (const gchar *creator,
const gchar *thumb_basedir)
{
GEnumClass *enum_class;
GEnumValue *enum_value;
gint i;
g_return_val_if_fail (creator != NULL, FALSE);
if (gimp_thumb_initialized)
gimp_thumb_exit ();
thumb_dir = (thumb_basedir ?
g_strdup (thumb_basedir) :
g_build_filename (g_get_home_dir(), ".thumbnails", NULL));
enum_class = g_type_class_ref (GIMP_TYPE_THUMB_SIZE);
thumb_num_sizes = enum_class->n_values;
thumb_sizes = g_new (gint, 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_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);
gimp_thumb_initialized = TRUE;
return gimp_thumb_initialized;
}
gboolean
gimp_thumb_ensure_thumb_dirs (GError **error)
{
gint i;
g_return_val_if_fail (gimp_thumb_initialized, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
for (i = 0; i < thumb_num_sizes; i++)
{
if (! g_file_test (thumb_subdirs[i], G_FILE_TEST_IS_DIR))
{
if (g_file_test (thumb_dir, G_FILE_TEST_IS_DIR) ||
(mkdir (thumb_dir, S_IRUSR | S_IWUSR | S_IXUSR) == 0))
{
if (i == 0)
mkdir (thumb_fail_subdir, S_IRUSR | S_IWUSR | S_IXUSR);
mkdir (thumb_subdirs[i], S_IRUSR | S_IWUSR | S_IXUSR);
}
if (! g_file_test (thumb_subdirs[i], G_FILE_TEST_IS_DIR))
{
g_set_error (error,
GIMP_THUMB_ERROR, GIMP_THUMB_ERROR_MKDIR,
_("Failed to create thumbnail folder '%s'."),
thumb_subdirs[i]);
return FALSE;
}
}
}
return TRUE;
}
gchar *
gimp_thumb_name_from_uri (const gchar *uri,
GimpThumbSize *size)
{
const gchar *name;
gint i = 0;
g_return_val_if_fail (gimp_thumb_initialized, NULL);
if (strstr (uri, thumb_dir))
return NULL;
name = gimp_thumb_png_name (uri);
if (*size != GIMP_THUMB_SIZE_FAIL)
{
for (i = 1;
i < thumb_num_sizes && thumb_sizes[i] < *size;
i++)
/* nothing */;
if (i == thumb_num_sizes)
i--;
}
*size = thumb_sizes[i];
return g_build_filename (thumb_subdirs[i], name, NULL);
}
gchar *
gimp_thumb_find_thumb (const gchar *uri,
GimpThumbSize *size)
{
const gchar *name;
gchar *thumb_name;
gint i, n;
g_return_val_if_fail (gimp_thumb_initialized, NULL);
name = gimp_thumb_png_name (uri);
for (i = 1; i < thumb_num_sizes && thumb_sizes[i] < *size; i++)
/* do nothing */;
n = i;
for (; i < thumb_num_sizes; i++)
{
thumb_name = g_build_filename (thumb_subdirs[i], name, NULL);
if (gimp_thumb_file_test (thumb_name, NULL, NULL))
{
*size = thumb_sizes[i];
return thumb_name;
}
g_free (thumb_name);
}
for (i = n - 1; i >= 0; i--)
{
thumb_name = g_build_filename (thumb_subdirs[i], name, NULL);
if (gimp_thumb_file_test (thumb_name, NULL, NULL))
{
*size = thumb_sizes[i];
return thumb_name;
}
g_free (thumb_name);
}
return NULL;
}
gboolean
gimp_thumb_file_test (const gchar *filename,
gint64 *mtime,
gint64 *size)
{
struct stat s;
if (stat (filename, &s) == 0 && (S_ISREG (s.st_mode)))
{
if (mtime)
*mtime = s.st_mtime;
if (size)
*size = s.st_size;
return TRUE;
}
return FALSE;
}
static void
gimp_thumb_exit (void)
{
gint i;
g_free (thumb_dir);
g_free (thumb_sizes);
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_dir = NULL;
thumb_subdirs = NULL;
thumb_fail_subdir = NULL;
gimp_thumb_initialized = FALSE;
}
static const gchar *
gimp_thumb_png_name (const gchar *uri)
{
static gchar name[40];
guchar digest[16];
guchar n;
gint i;
gimp_md5_get_digest (uri, -1, digest);
for (i = 0; i < 16; i++)
{
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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