glib/gio/gfileinfo.c

/* GIO - GLib Input, Output and Streaming Library
 * 
 * Copyright (C) 2006-2007 Red Hat, Inc.
 *
 * 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.
 *
 * Author: Alexander Larsson <alexl@redhat.com>
 */

/**
 * SECTION:gfileinfo
 * @short_description: File Information and Attributes
 * @see_also: #GFile
 * 
 * Functionality for manipulating basic metadata for files. #GFileInfo
 * implements methods for getting information that all files should 
 * contain, and allows for manipulation of extended attributes. 
 * #GFileAttributeMatcher allows for searching through a #GFileInfo for 
 * attributes.
 * 
 * 
 * 
 **/

#include <config.h>

#include <string.h>

#include "gfileinfo.h"
#include "glibintl.h"

#include "gioalias.h"

/* We use this nasty thing, because NULL is a valid attribute matcher (matches nothing) */
#define NO_ATTRIBUTE_MASK ((GFileAttributeMatcher *)1)

typedef struct  {
  guint32 attribute;
  GFileAttributeValue value;
} GFileAttribute;

struct _GFileInfo
{
  GObject parent_instance;

  GArray *attributes;
  GFileAttributeMatcher *mask;
};

struct _GFileInfoClass
{
  GObjectClass parent_class;
};

static gboolean g_file_attribute_matcher_matches_id (GFileAttributeMatcher *matcher,
						     guint32 id);

G_DEFINE_TYPE (GFileInfo, g_file_info, G_TYPE_OBJECT);

typedef struct {
  guint32 id;
  guint32 attribute_id_counter;
} NSInfo;

G_LOCK_DEFINE_STATIC (attribute_hash);
static int namespace_id_counter = 0;
static GHashTable *ns_hash = NULL;
static GHashTable *attribute_hash = NULL;
static char ***attributes = NULL;

/* Attribute ids are 32bit, we split it up like this:
 * |------------|--------------------|
 *   12 bit          20 bit       
 *   namespace      attribute id    
 *
 * This way the attributes gets sorted in namespace order
 */

#define NS_POS 20
#define NS_MASK ((guint32)((1<<12) - 1))
#define ID_POS 0
#define ID_MASK ((guint32)((1<<20) - 1))

#define GET_NS(_attr_id) \
    (((guint32) (_attr_id) >> NS_POS) & NS_MASK)
#define GET_ID(_attr_id) \
    (((guint32)(_attr_id) >> ID_POS) & ID_MASK)

#define MAKE_ATTR_ID(_ns, _id)				\
    ( ((((guint32) _ns) & NS_MASK) << NS_POS) |		\
      ((((guint32) _id) & ID_MASK) << ID_POS) )

static NSInfo *
_lookup_namespace (const char *namespace)
{
  NSInfo *ns_info;
  
  ns_info = g_hash_table_lookup (ns_hash, namespace);
  if (ns_info == NULL)
    {
      ns_info = g_new0 (NSInfo, 1);
      ns_info->id = ++namespace_id_counter;
      g_hash_table_insert (ns_hash, g_strdup (namespace), ns_info);
      attributes = g_realloc (attributes, (ns_info->id + 1) * sizeof (char **));
      attributes[ns_info->id] = NULL;
    }
  return ns_info;
}

static guint32
lookup_namespace (const char *namespace)
{
  NSInfo *ns_info;
  guint32 id;
  
  G_LOCK (attribute_hash);
  
  if (attribute_hash == NULL)
    {
      ns_hash = g_hash_table_new (g_str_hash, g_str_equal);
      attribute_hash = g_hash_table_new (g_str_hash, g_str_equal);
    }

  ns_info = _lookup_namespace (namespace);
  id = 0;
  if (ns_info)
    id = ns_info->id;
  
  G_UNLOCK (attribute_hash);

  return id;
}

static char *
get_attribute_for_id (int attribute)
{
  char *s;
  G_LOCK (attribute_hash);
  s = attributes[GET_NS(attribute)][GET_ID(attribute)];
  G_UNLOCK (attribute_hash);
  return s;
}

static guint32
lookup_attribute (const char *attribute)
{
  guint32 attr_id, id;
  char *ns;
  const char *colon;
  NSInfo *ns_info;
  
  G_LOCK (attribute_hash);
  if (attribute_hash == NULL)
    {
      ns_hash = g_hash_table_new (g_str_hash, g_str_equal);
      attribute_hash = g_hash_table_new (g_str_hash, g_str_equal);
    }

  attr_id = GPOINTER_TO_UINT (g_hash_table_lookup (attribute_hash, attribute));

  if (attr_id != 0)
    {
      G_UNLOCK (attribute_hash);
      return attr_id;
    }

  colon = strchr (attribute, ':');
  if (colon)
    ns = g_strndup (attribute, colon - attribute);
  else
    ns = g_strdup ("");

  ns_info = _lookup_namespace (ns);
  g_free (ns);

  id = ++ns_info->attribute_id_counter;
  attributes[ns_info->id] = g_realloc (attributes[ns_info->id], (id + 1) * sizeof (char *));
  attributes[ns_info->id][id] = g_strdup (attribute);
  
  attr_id = MAKE_ATTR_ID (ns_info->id, id);

  g_hash_table_insert (attribute_hash, attributes[ns_info->id][id], GUINT_TO_POINTER (attr_id));
  
  G_UNLOCK (attribute_hash);
  
  return attr_id;
}

static void
g_file_info_finalize (GObject *object)
{
  GFileInfo *info;
  int i;
  GFileAttribute *attrs;

  info = G_FILE_INFO (object);

  attrs = (GFileAttribute *)info->attributes->data;
  for (i = 0; i < info->attributes->len; i++)
    g_file_attribute_value_clear (&attrs[i].value);
  g_array_free (info->attributes, TRUE);  

  if (info->mask != NO_ATTRIBUTE_MASK)
    g_file_attribute_matcher_unref (info->mask);
  
  if (G_OBJECT_CLASS (g_file_info_parent_class)->finalize)
    (*G_OBJECT_CLASS (g_file_info_parent_class)->finalize) (object);
}

static void
g_file_info_class_init (GFileInfoClass *klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  
  gobject_class->finalize = g_file_info_finalize;
}

static void
g_file_info_init (GFileInfo *info)
{
  info->mask = NO_ATTRIBUTE_MASK;
  info->attributes = g_array_new (FALSE, FALSE,
				  sizeof (GFileAttribute));
}

/**
 * g_file_info_new:
 * 
 * Creates a new file info structure.
 * 
 * Returns: a #GFileInfo.
 **/
GFileInfo *
g_file_info_new (void)
{
  return g_object_new (G_TYPE_FILE_INFO, NULL);
}

/**
 * g_file_info_copy_into:
 * @src_info: source to copy attributes from.
 * @dest_info: destination to copy attributes to.
 * 
 * Copies all of the #GFileAttribute<!-- -->s from @src_info to @dest_info.
 **/
void
g_file_info_copy_into (GFileInfo *src_info, 
                       GFileInfo *dest_info)
{
  GFileAttribute *source, *dest;
  int i;

  g_return_if_fail (G_IS_FILE_INFO (src_info));
  g_return_if_fail (G_IS_FILE_INFO (dest_info));

  dest = (GFileAttribute *)dest_info->attributes->data;
  for (i = 0; i < dest_info->attributes->len; i++)
    g_file_attribute_value_clear (&dest[i].value);
  
  g_array_set_size (dest_info->attributes,
		    src_info->attributes->len);

  source = (GFileAttribute *)src_info->attributes->data;
  dest = (GFileAttribute *)dest_info->attributes->data;
  
  for (i = 0; i < src_info->attributes->len; i++)
    {
      dest[i].attribute = source[i].attribute;
      dest[i].value.type = G_FILE_ATTRIBUTE_TYPE_INVALID;
      g_file_attribute_value_set (&dest[i].value, &source[i].value);
    }

  if (src_info->mask == NO_ATTRIBUTE_MASK)
    dest_info->mask = NO_ATTRIBUTE_MASK;
  else
    dest_info->mask = g_file_attribute_matcher_ref (src_info->mask);
}

/**
 * g_file_info_dup:
 * @other: a #GFileInfo.
 * 
 * Duplicates a file info structure.
 * 
 * Returns: a duplicate #GFileInfo of @other.
 **/
GFileInfo *
g_file_info_dup (GFileInfo *other)
{
  GFileInfo *new;
  
  g_return_val_if_fail (G_IS_FILE_INFO (other), NULL);
  
  new = g_file_info_new ();
  g_file_info_copy_into (other, new);
  return new;
}

/**
 * g_file_info_set_attribute_mask:
 * @info: a #GFileInfo.
 * @mask: a #GFileAttributeMatcher.
 *
 * Sets @mask on @info to match specific attribute types.
 **/
void
g_file_info_set_attribute_mask (GFileInfo             *info,
				GFileAttributeMatcher *mask)
{
  GFileAttribute *attr;
  int i;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (mask != NULL);
  
  if (mask != info->mask)
    {
      if (info->mask != NO_ATTRIBUTE_MASK)
	g_file_attribute_matcher_unref (info->mask);
      info->mask = g_file_attribute_matcher_ref (mask);

      /* Remove non-matching attributes */
      for (i = 0; i < info->attributes->len; i++)
	{
	  attr = &g_array_index (info->attributes, GFileAttribute, i);
	  if (!g_file_attribute_matcher_matches_id (mask,
						    attr->attribute))
	    {
	      g_file_attribute_value_clear (&attr->value);
	      g_array_remove_index (info->attributes, i);
	      i--;
	    }
	}
    }
}

/**
 * g_file_info_unset_attribute_mask:
 * @info: #GFileInfo.
 * 
 * Unsets a mask set by g_file_info_set_attribute_mask(), if one
 * is set.
 **/
void
g_file_info_unset_attribute_mask (GFileInfo *info)
{
  g_return_if_fail (G_IS_FILE_INFO (info));

  if (info->mask != NO_ATTRIBUTE_MASK)
    g_file_attribute_matcher_unref (info->mask);
  info->mask = NO_ATTRIBUTE_MASK;
}

/**
 * g_file_info_clear_status:
 * @info: a #GFileInfo.
 *
 * Clears the status information from @info.
 **/
void
g_file_info_clear_status (GFileInfo  *info)
{
  GFileAttribute *attrs;
  int i;
  
  g_return_if_fail (G_IS_FILE_INFO (info));

  attrs = (GFileAttribute *)info->attributes->data;
  for (i = 0; i < info->attributes->len; i++)
    attrs[i].value.status = G_FILE_ATTRIBUTE_STATUS_UNSET;
}

static int
g_file_info_find_place (GFileInfo  *info,
			guint32     attribute)
{
  int min, max, med;
  GFileAttribute *attrs;
  /* Binary search for the place where attribute would be, if its
     in the array */

  min = 0;
  max = info->attributes->len;

  attrs = (GFileAttribute *)info->attributes->data;

  while (min < max)
    {
      med = min + (max - min) / 2;
      if (attrs[med].attribute == attribute)
	{
	  min = med;
	  break;
	}
      else if (attrs[med].attribute < attribute)
	min = med + 1;
      else /* attrs[med].attribute > attribute */
	max = med;
    }

  return min;
}

static GFileAttributeValue *
g_file_info_find_value (GFileInfo *info,
			guint32    attr_id)
{
  GFileAttribute *attrs;
  int i;

  i = g_file_info_find_place (info, attr_id);
  attrs = (GFileAttribute *)info->attributes->data;
  if (i < info->attributes->len &&
      attrs[i].attribute == attr_id)
    return &attrs[i].value;
  
  return NULL;
}

static GFileAttributeValue *
g_file_info_find_value_by_name (GFileInfo  *info,
				const char *attribute)
{
  guint32 attr_id;

  attr_id = lookup_attribute (attribute);
  return g_file_info_find_value (info, attr_id);
}

/**
 * g_file_info_has_attribute:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Checks if a file info structure has an attribute named @attribute.
 * 
 * Returns: %TRUE if @GFileInfo has an attribute named @attribute, 
 * %FALSE otherwise.
 **/
gboolean
g_file_info_has_attribute (GFileInfo  *info,
			   const char *attribute)
{
  GFileAttributeValue *value;

  g_return_val_if_fail (G_IS_FILE_INFO (info), FALSE);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', FALSE);

  value = g_file_info_find_value_by_name (info, attribute);
  return value != NULL;
}

/**
 * g_file_info_list_attributes:
 * @info: a #GFileInfo.
 * @name_space: a file attribute key's namespace.
 * 
 * Lists the file info structure's attributes.
 * 
 * Returns: a null-terminated array of strings of all of the 
 * possible attribute types for the given @name_space, or 
 * %NULL on error.
 **/
char **
g_file_info_list_attributes (GFileInfo  *info,
			     const char *name_space)
{
  GPtrArray *names;
  GFileAttribute *attrs;
  guint32 attribute;
  guint32 ns_id = (name_space) ? lookup_namespace (name_space) : 0;
  int i;
 
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);

  names = g_ptr_array_new ();
  attrs = (GFileAttribute *)info->attributes->data;
  for (i = 0; i < info->attributes->len; i++)
    {
      attribute = attrs[i].attribute;
      if (ns_id == 0 || GET_NS (attribute) == ns_id)
        g_ptr_array_add (names, g_strdup (get_attribute_for_id (attribute)));
    }

  /* NULL terminate */
  g_ptr_array_add (names, NULL);
  
  return (char **)g_ptr_array_free (names, FALSE);
}

/**
 * g_file_info_get_attribute_type:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets the attribute type for an attribute key.
 * 
 * Returns: a #GFileAttributeType for the given @attribute, or 
 * %G_FILE_ATTRIBUTE_TYPE_INVALID if the key is invalid.
 **/
GFileAttributeType
g_file_info_get_attribute_type (GFileInfo  *info,
				const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), G_FILE_ATTRIBUTE_TYPE_INVALID);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', G_FILE_ATTRIBUTE_TYPE_INVALID);

  value = g_file_info_find_value_by_name (info, attribute);
  if (value)
    return value->type;
  else
    return G_FILE_ATTRIBUTE_TYPE_INVALID;
}

/**
 * g_file_info_remove_attribute:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Removes all cases of @attribute from @info if it exists.
 *
 **/
void
g_file_info_remove_attribute (GFileInfo  *info,
			      const char *attribute)
{
  guint32 attr_id;
  GFileAttribute *attrs;
  int i;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  attr_id = lookup_attribute (attribute);
  
  i = g_file_info_find_place (info, attr_id);
  attrs = (GFileAttribute *)info->attributes->data;
  if (i < info->attributes->len &&
      attrs[i].attribute == attr_id)
    {
      g_file_attribute_value_clear (&attrs[i].value);
      g_array_remove_index (info->attributes, i);
    }
}

/**
 * g_file_info_get_attribute:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets an attribute value from a file info structure.
 * 
 * Returns: a #GFileAttributeValue for the given @attribute, or 
 * %NULL otherwise.
 **/
GFileAttributeValue *
g_file_info_get_attribute (GFileInfo  *info,
			   const char *attribute)
  
{
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', NULL);

  return g_file_info_find_value_by_name (info, attribute);
}

/**
 * g_file_info_get_attribute_object:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets the value of a #GObject attribute. If the attribute does 
 * not contain a #GObject, %NULL will be returned.
 * 
 * Returns: a #GObject associated with the given @attribute, or
 * %NULL otherwise.
 **/
GObject *
g_file_info_get_attribute_object (GFileInfo  *info,
				  const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', NULL);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_object (value);
}

/**
 * g_file_info_get_attribute_string:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets the value of a string attribute. If the attribute does 
 * not contain a string, %NULL will be returned.
 * 
 * Returns: the contents of the @attribute value as a string, or 
 * %NULL otherwise.
 **/
const char *
g_file_info_get_attribute_string (GFileInfo  *info,
				  const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', NULL);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_string (value);
}

/**
 * g_file_info_get_attribute_byte_string:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets the value of a byte string attribute. If the attribute does 
 * not contain a byte string, %NULL will be returned.
 * 
 * Returns: the contents of the @attribute value as a byte string, or 
 * %NULL otherwise.
 **/
const char *
g_file_info_get_attribute_byte_string (GFileInfo  *info,
				       const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', NULL);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_byte_string (value);
}

/**
 * g_file_info_get_attribute_boolean:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets the value of a boolean attribute. If the attribute does not
 * contain a boolean value, %FALSE will be returned.
 * 
 * Returns: the boolean value contained within the attribute. 
 **/
gboolean
g_file_info_get_attribute_boolean (GFileInfo  *info,
				   const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), FALSE);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', FALSE);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_boolean (value);
}

/**
 * g_file_info_get_attribute_uint32:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets an unsigned 32-bit integer contained within the attribute. If the 
 * attribute does not contain an unsigned 32-bit integer, or is invalid, 
 * 0 will be returned.
 * 
 * Returns: an unsigned 32-bit integer from the attribute. 
 **/
guint32
g_file_info_get_attribute_uint32 (GFileInfo  *info,
				  const char *attribute)
{
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), 0);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', 0);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_uint32 (value);
}

/**
 * g_file_info_get_attribute_int32:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets a signed 32-bit integer contained within the attribute. If the 
 * attribute does not contain a signed 32-bit integer, or is invalid, 
 * 0 will be returned.
 * 
 * Returns: a signed 32-bit integer from the attribute.
 **/
gint32
g_file_info_get_attribute_int32 (GFileInfo  *info,
				 const char *attribute)
{
  GFileAttributeValue *value;

  g_return_val_if_fail (G_IS_FILE_INFO (info), 0);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', 0);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_int32 (value);
}

/**
 * g_file_info_get_attribute_uint64:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets a unsigned 64-bit integer contained within the attribute. If the 
 * attribute does not contain an unsigned 64-bit integer, or is invalid, 
 * 0 will be returned.
 * 
 * Returns: a unsigned 64-bit integer from the attribute. 
 **/
guint64
g_file_info_get_attribute_uint64 (GFileInfo  *info,
				  const char *attribute)
{
  GFileAttributeValue *value;

  g_return_val_if_fail (G_IS_FILE_INFO (info), 0);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', 0);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_uint64 (value);
}

/**
 * g_file_info_get_attribute_int64:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * 
 * Gets a signed 64-bit integer contained within the attribute. If the 
 * attribute does not contain an signed 64-bit integer, or is invalid, 
 * 0 will be returned.
 * 
 * Returns: a signed 64-bit integer from the attribute. 
 **/
gint64
g_file_info_get_attribute_int64  (GFileInfo  *info,
				  const char *attribute)
{
  GFileAttributeValue *value;

  g_return_val_if_fail (G_IS_FILE_INFO (info), 0);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', 0);

  value = g_file_info_find_value_by_name (info, attribute);
  return g_file_attribute_value_get_int64 (value);
}

static GFileAttributeValue *
g_file_info_create_value (GFileInfo *info,
			  guint32 attr_id)
{
  GFileAttribute *attrs;
  GFileAttribute attr;
  int i;

  if (info->mask != NO_ATTRIBUTE_MASK &&
      !g_file_attribute_matcher_matches_id (info->mask, attr_id))
    return NULL;
  
  i = g_file_info_find_place (info, attr_id);
  
  attrs = (GFileAttribute *)info->attributes->data;
  if (i < info->attributes->len &&
      attrs[i].attribute == attr_id)
    return &attrs[i].value;
  else
    {
      attr.attribute = attr_id;
      attr.value.type = G_FILE_ATTRIBUTE_TYPE_INVALID;
      g_array_insert_val (info->attributes, i, attr);

      attrs = (GFileAttribute *)info->attributes->data;
      return &attrs[i].value;
    }
}

static GFileAttributeValue *
g_file_info_create_value_by_name (GFileInfo *info,
				  const char *attribute)
{
  guint32 attr_id;

  attr_id = lookup_attribute (attribute);

  return g_file_info_create_value (info, attr_id);
}

/**
 * g_file_info_set_attribute:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a #GFileAttributeValue.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute (GFileInfo                 *info,
			   const char                *attribute,
			   const GFileAttributeValue *attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');
  g_return_if_fail (attr_value != NULL);

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set (value, attr_value);
}

/**
 * g_file_info_set_attribute_object:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a #GObject.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_object (GFileInfo  *info,
				  const char *attribute,
				  GObject    *attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');
  g_return_if_fail (G_IS_OBJECT (attr_value));

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_object (value, attr_value);
}

/**
 * g_file_info_set_attribute_string:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a string.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_string (GFileInfo  *info,
				  const char *attribute,
				  const char *attr_value)
{
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');
  g_return_if_fail (attr_value != NULL);

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_string (value, attr_value);
}

/**
 * g_file_info_set_attribute_byte_string:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a byte string.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_byte_string (GFileInfo  *info,
				       const char *attribute,
				       const char *attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');
  g_return_if_fail (attr_value != NULL);

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_byte_string (value, attr_value);
}

/**
 * g_file_info_set_attribute_boolean:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a boolean value.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_boolean (GFileInfo  *info,
				   const char *attribute,
				   gboolean    attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_boolean (value, attr_value);
}

/**
 * g_file_info_set_attribute_uint32:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: an unsigned 32-bit integer.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_uint32 (GFileInfo  *info,
				  const char *attribute,
				  guint32     attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_uint32 (value, attr_value);
}


/**
 * g_file_info_set_attribute_int32:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: a signed 32-bit integer
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_int32 (GFileInfo  *info,
                                 const char *attribute,
                                 gint32      attr_value)
{
  GFileAttributeValue *value;
 
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_int32 (value, attr_value);
}

/**
 * g_file_info_set_attribute_uint64:
 * @info: a #GFileInfo.
 * @attribute: a file attribute key.
 * @attr_value: an unsigned 64-bit integer.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 **/
void
g_file_info_set_attribute_uint64 (GFileInfo  *info,
				  const char *attribute,
				  guint64     attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_uint64 (value, attr_value);
}

/**
 * g_file_info_set_attribute_int64:
 * @info: a #GFileInfo.
 * @attribute: attribute name to set.
 * @attr_value: int64 value to set attribute to.
 * 
 * Sets the @attribute to contain the given @attr_value, 
 * if possible.
 * 
 **/
void
g_file_info_set_attribute_int64  (GFileInfo  *info,
				  const char *attribute,
				  gint64      attr_value)
{
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (attribute != NULL && *attribute != '\0');

  value = g_file_info_create_value_by_name (info, attribute);
  if (value)
    g_file_attribute_value_set_int64 (value, attr_value);
}

/* Helper getters */
/**
 * g_file_info_get_file_type:
 * @info: a #GFileInfo.
 * 
 * Gets a file's type (whether it is a regular file, symlink, etc). 
 * This is different from the file's content type, see g_file_info_get_content_type().
 * 
 * Returns: a #GFileType for the given file.
 **/
GFileType
g_file_info_get_file_type (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;

  g_return_val_if_fail (G_IS_FILE_INFO (info), G_FILE_TYPE_UNKNOWN);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_TYPE);
  
  value = g_file_info_find_value (info, attr);
  return (GFileType)g_file_attribute_value_get_uint32 (value);
}

/**
 * g_file_info_get_is_hidden:
 * @info: a #GFileInfo.
 * 
 * Checks if a file is hidden.
 * 
 * Returns: %TRUE if the file is a hidden file, %FALSE otherwise.
 **/
gboolean
g_file_info_get_is_hidden (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), FALSE);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_IS_HIDDEN);
  
  value = g_file_info_find_value (info, attr);
  return (GFileType)g_file_attribute_value_get_boolean (value);
}

/**
 * g_file_info_get_is_backup:
 * @info: a #GFileInfo.
 * 
 * Checks if a file is a backup file.
 * 
 * Returns: %TRUE if file is a backup file, %FALSE otherwise.
 **/
gboolean
g_file_info_get_is_backup (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), FALSE);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_IS_BACKUP);
  
  value = g_file_info_find_value (info, attr);
  return (GFileType)g_file_attribute_value_get_boolean (value);
}

/**
 * g_file_info_get_is_symlink:
 * @info: a #GFileInfo.
 * 
 * Checks if a file is a symlink.
 * 
 * Returns: %TRUE if the given @info is a symlink.
 **/
gboolean
g_file_info_get_is_symlink (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), FALSE);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_IS_SYMLINK);
  
  value = g_file_info_find_value (info, attr);
  return (GFileType)g_file_attribute_value_get_boolean (value);
}

/**
 * g_file_info_get_name:
 * @info: a #GFileInfo.
 * 
 * Gets the name for a file.
 * 
 * Returns: a string containing the file name.
 **/
const char *
g_file_info_get_name (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_NAME);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_byte_string (value);
}

/**
 * g_file_info_get_display_name:
 * @info: a #GFileInfo.
 * 
 * Gets a display name for a file.
 * 
 * Returns: a string containing the display name.
 **/
const char *
g_file_info_get_display_name (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_DISPLAY_NAME);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_string (value);
}

/**
 * g_file_info_get_edit_name:
 * @info: a #GFileInfo.
 * 
 * Gets the edit name for a file.
 * 
 * Returns: a string containing the edit name.
 **/
const char *
g_file_info_get_edit_name (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_EDIT_NAME);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_string (value);
}

/**
 * g_file_info_get_icon:
 * @info: a #GFileInfo.
 * 
 * Gets the icon for a file.
 * 
 * Returns: #GIcon for the given @info.
 **/
GIcon *
g_file_info_get_icon (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  GObject *obj;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_ICON);
  
  value = g_file_info_find_value (info, attr);
  obj = g_file_attribute_value_get_object (value);
  if (obj != NULL && G_IS_ICON (obj))
    return G_ICON (obj);
  return NULL;
}

/**
 * g_file_info_get_content_type:
 * @info: a #GFileInfo.
 * 
 * Gets the file's content type.
 * 
 * Returns: a string containing the file's content type.s
 **/
const char *
g_file_info_get_content_type (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_CONTENT_TYPE);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_string (value);
}

/**
 * g_file_info_get_size:
 * @info: a #GFileInfo.
 * 
 * Gets the file's size.
 * 
 * Returns: a #goffset containing the file's size. 
 **/
goffset
g_file_info_get_size (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
 
  g_return_val_if_fail (G_IS_FILE_INFO (info), (goffset) 0);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SIZE);
  
  value = g_file_info_find_value (info, attr);
  return (goffset) g_file_attribute_value_get_uint64 (value);
}

/**
 * g_file_info_get_modification_time:
 * @info: a #GFileInfo.
 * @result: a #GTimeVal.
 * 
 * Gets the modification time of the current @info and sets it
 * in @result.
 **/
void
g_file_info_get_modification_time (GFileInfo *info,
				   GTimeVal  *result)
{
  static guint32 attr_mtime = 0, attr_mtime_usec;
  GFileAttributeValue *value;

  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (result != NULL);
  
  if (attr_mtime == 0)
    {
      attr_mtime = lookup_attribute (G_FILE_ATTRIBUTE_TIME_MODIFIED);
      attr_mtime_usec = lookup_attribute (G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC);
    }
  
  value = g_file_info_find_value (info, attr_mtime);
  result->tv_sec = g_file_attribute_value_get_uint64 (value);
  value = g_file_info_find_value (info, attr_mtime_usec);
  result->tv_usec = g_file_attribute_value_get_uint32 (value);
}

/**
 * g_file_info_get_symlink_target:
 * @info: a #GFileInfo.
 * 
 * Gets the symlink target for a given #GFileInfo.
 * 
 * Returns: a string containing the symlink target.
 **/
const char *
g_file_info_get_symlink_target (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SYMLINK_TARGET);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_byte_string (value);
}

/**
 * g_file_info_get_etag:
 * @info: a #GFileInfo.
 * 
 * Gets the <link linkend="gfile-etag">entity tag</link> for a given 
 * #GFileInfo. See %G_FILE_ATTRIBUTE_ETAG_VALUE.
 * 
 * Returns: a string containing the value of the "etag:value" attribute.
 **/
const char *
g_file_info_get_etag (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_ETAG_VALUE);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_string (value);
}

/**
 * g_file_info_get_sort_order:
 * @info: a #GFileInfo.
 * 
 * Gets the value of the sort_order attribute from the #GFileInfo.
 * See %G_FILE_ATTRIBUTE_STD_SORT_ORDER.
 * 
 * Returns: a #gint32 containing the value of the "std:sort_order" attribute.
 **/
gint32
g_file_info_get_sort_order (GFileInfo *info)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_val_if_fail (G_IS_FILE_INFO (info), 0);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SORT_ORDER);
  
  value = g_file_info_find_value (info, attr);
  return g_file_attribute_value_get_int32 (value);
}

/* Helper setters: */
/**
 * g_file_info_set_file_type:
 * @info: a #GFileInfo.
 * @type: a #GFileType.
 * 
 * Sets the file type in a #GFileInfo to @type.
 * See %G_FILE_ATTRIBUTE_STD_TYPE.
 **/
void
g_file_info_set_file_type (GFileInfo *info,
			   GFileType  type)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_TYPE);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_uint32 (value, type);
}

/**
 * g_file_info_set_is_hidden:
 * @info: a #GFileInfo.
 * @is_hidden: a #gboolean.
 * 
 * Sets the "is_hidden" attribute in a #GFileInfo according to @is_symlink.
 * See %G_FILE_ATTRIBUTE_STD_IS_HIDDEN.
 **/
void
g_file_info_set_is_hidden (GFileInfo *info,
			   gboolean   is_hidden)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_IS_HIDDEN);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_boolean (value, is_hidden);
}

/**
 * g_file_info_set_is_symlink:
 * @info: a #GFileInfo.
 * @is_symlink: a #gboolean.
 * 
 * Sets the "is_symlink" attribute in a #GFileInfo according to @is_symlink.
 * See %G_FILE_ATTRIBUTE_STD_IS_SYMLINK.
 **/
void
g_file_info_set_is_symlink (GFileInfo *info,
			    gboolean   is_symlink)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_IS_SYMLINK);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_boolean (value, is_symlink);
}

/**
 * g_file_info_set_name:
 * @info: a #GFileInfo.
 * @name: a string containing a name.
 * 
 * Sets the name attribute for the current #GFileInfo. 
 * See %G_FILE_ATTRIBUTE_STD_NAME.
 **/
void
g_file_info_set_name (GFileInfo  *info,
		      const char *name)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (name != NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_NAME);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_byte_string (value, name);
}

/**
 * g_file_info_set_display_name:
 * @info: a #GFileInfo.
 * @display_name: a string containing a display name.
 * 
 * Sets the display name for the current #GFileInfo.
 * See %G_FILE_ATTRIBUTE_STD_DISPLAY_NAME.
 **/
void
g_file_info_set_display_name (GFileInfo  *info,
			      const char *display_name)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (display_name != NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_DISPLAY_NAME);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_string (value, display_name);
}

/**
 * g_file_info_set_edit_name:
 * @info: a #GFileInfo.
 * @edit_name: a string containing an edit name.
 * 
 * Sets the edit name for the current file.
 * See %G_FILE_ATTRIBUTE_STD_EDIT_NAME.
 **/
void
g_file_info_set_edit_name (GFileInfo  *info,
			   const char *edit_name)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (edit_name != NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_EDIT_NAME);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_string (value, edit_name);
}

/**
 * g_file_info_set_icon:
 * @info: a #GFileInfo.
 * @icon: a #GIcon.
 * 
 * Sets the icon for a given #GFileInfo. 
 * See %G_FILE_ATTRIBUTE_STD_ICON.
 **/
void
g_file_info_set_icon (GFileInfo *info,
		      GIcon     *icon)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (G_IS_ICON (icon));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_ICON);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_object (value, G_OBJECT (icon));
}

/**
 * g_file_info_set_content_type:
 * @info: a #GFileInfo.
 * @content_type: a content type. See #GContentType.
 * 
 * Sets the content type attribute for a given #GFileInfo.
 * See %G_FILE_ATTRIBUTE_STD_CONTENT_TYPE.
 **/
void
g_file_info_set_content_type (GFileInfo  *info,
			      const char *content_type)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (content_type != NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_CONTENT_TYPE);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_string (value, content_type);
}

/**
 * g_file_info_set_size:
 * @info: a #GFileInfo.
 * @size: a #goffset containing the file's size.
 * 
 * Sets the %G_FILE_ATTRIBUTE_STD_SIZE attribute in the file info 
 * to the given size.
 **/
void
g_file_info_set_size (GFileInfo *info,
		      goffset    size)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SIZE);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_uint64 (value, size);
}

/**
 * g_file_info_set_modification_time
 * @info: a #GFileInfo.
 * @mtime: a #GTimeVal.
 * 
 * Sets the %G_FILE_ATTRIBUTE_TIME_MODIFIED attribute in the file
 * info to the given time value.
 **/
void
g_file_info_set_modification_time (GFileInfo *info,
				   GTimeVal  *mtime)
{
  static guint32 attr_mtime = 0, attr_mtime_usec;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (mtime != NULL);
  
  if (attr_mtime == 0)
    {
      attr_mtime = lookup_attribute (G_FILE_ATTRIBUTE_TIME_MODIFIED);
      attr_mtime_usec = lookup_attribute (G_FILE_ATTRIBUTE_TIME_MODIFIED_USEC);
    }
  
  value = g_file_info_create_value (info, attr_mtime);
  if (value)
    g_file_attribute_value_set_uint64 (value, mtime->tv_sec);
  value = g_file_info_create_value (info, attr_mtime_usec);
  if (value)
    g_file_attribute_value_set_uint32 (value, mtime->tv_usec);
}

/**
 * g_file_info_set_symlink_target:
 * @info: a #GFileInfo.
 * @symlink_target: a static string containing a path to a symlink target.
 * 
 * Sets the %G_FILE_ATTRIBUTE_STD_SYMLINK_TARGET attribute in the file info 
 * to the given symlink target.
 **/
void
g_file_info_set_symlink_target (GFileInfo  *info,
				const char *symlink_target)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  g_return_if_fail (symlink_target != NULL);
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SYMLINK_TARGET);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_byte_string (value, symlink_target);
}

/**
 * g_file_info_set_sort_order:
 * @info: a #GFileInfo.
 * @sort_order: a sort order integer.
 * 
 * Sets the sort order attribute in the file info structure. See 
 * %G_FILE_ATTRIBUTE_STD_SORT_ORDER.
 **/
void
g_file_info_set_sort_order (GFileInfo *info,
			    gint32     sort_order)
{
  static guint32 attr = 0;
  GFileAttributeValue *value;
  
  g_return_if_fail (G_IS_FILE_INFO (info));
  
  if (attr == 0)
    attr = lookup_attribute (G_FILE_ATTRIBUTE_STD_SORT_ORDER);
  
  value = g_file_info_create_value (info, attr);
  if (value)
    g_file_attribute_value_set_int32 (value, sort_order);
}


#define ON_STACK_MATCHERS 5

typedef struct {
  guint32 id;
  guint32 mask;
} SubMatcher;

struct _GFileAttributeMatcher {
  gboolean all;
  SubMatcher sub_matchers[ON_STACK_MATCHERS];
  GArray *more_sub_matchers;

  /* Interator */
  guint32 iterator_ns;
  int iterator_pos;
  int ref;
};

static void
matcher_add (GFileAttributeMatcher *matcher,
	     guint                  id,
             guint                  mask)
{
  SubMatcher *sub_matchers;
  int i;
  SubMatcher s;

  for (i = 0; i < ON_STACK_MATCHERS; i++)
    {
      /* First empty spot, not found, use this */
      if (matcher->sub_matchers[i].id == 0)
	{
	  matcher->sub_matchers[i].id = id;
	  matcher->sub_matchers[i].mask = mask;
	  return;
	}
      
      /* Already added */
      if (matcher->sub_matchers[i].id == id &&
	  matcher->sub_matchers[i].mask == mask)
	return;
    }

  if (matcher->more_sub_matchers == NULL)
    matcher->more_sub_matchers = g_array_new (FALSE, FALSE, sizeof (SubMatcher));
      
  sub_matchers = (SubMatcher *)matcher->more_sub_matchers->data;
  for (i = 0; i < matcher->more_sub_matchers->len; i++)
    {
      /* Already added */
      if (sub_matchers[i].id == id &&
	  sub_matchers[i].mask == mask)
	return;
    }

  s.id = id;
  s.mask = mask;
  
  g_array_append_val (matcher->more_sub_matchers, s);
}

/**
 * g_file_attribute_matcher_new:
 * @attributes: an attribute string to match.
 * 
 * Creates a new file attribute matcher, which matches attributes 
 * against a given string. #GFileAttributeMatcher<!-- -->s are reference 
 * counted structures, and are created with a reference count of 1. If 
 * the number of references falls to 0, the #GFileAttributeMatcher is 
 * automatically destroyed.
 * 
 * The @attribute string should be formatted with specific keys separated
 * from namespaces with a colon. Several "namespace:key" strings may be 
 * concatenated with a single comma (e.g. "std:type,std:is_hidden"). 
 * The wildcard "*" may be used to match all keys and namespaces, or 
 * "namespace:*" will match all keys in a given namespace. 
 * 
 * Examples of strings to use:
 * <table>
 * <title>File Attribute Matcher strings and results</title>
 * <tgroup cols='2' align='left'><thead>
 * <row><entry> Matcher String </entry><entry> Matches </entry></row></thead>
 * <tbody>
 * <row><entry>"*"</entry><entry>matches all attributes.</entry></row>
 * <row><entry>"std:is_hidden"</entry><entry>matches only the key is_hidden in the std namespace.</entry></row>
 * <row><entry>"std:type,unix:*"</entry><entry>matches the type key in the std namespace and all keys in the unix 
 * namespace.</entry></row>
 * </tbody></tgroup>
 * </table>
 * 
 * Returns: a #GFileAttributeMatcher.
 **/
GFileAttributeMatcher *
g_file_attribute_matcher_new (const char *attributes)
{
  char **split;
  char *colon;
  int i;
  GFileAttributeMatcher *matcher;

  if (attributes == NULL || *attributes == '\0')
    return NULL;

  matcher = g_malloc0 (sizeof (GFileAttributeMatcher));
  matcher->ref = 1;

  split = g_strsplit (attributes, ",", -1);

  for (i = 0; split[i] != NULL; i++)
    {
      if (strcmp (split[i], "*") == 0)
	matcher->all = TRUE;
      else
	{
	  guint32 id, mask;
  
	  colon = strchr (split[i], ':');
	  if (colon != NULL &&
	      !(colon[1] == 0 ||
		(colon[1] == '*' &&
		 colon[2] == 0)))
	    {
	      id = lookup_attribute (split[i]);
	      mask = 0xffffffff;
	    }
	  else
	    {
	      if (colon)
		*colon = 0;

	      id = lookup_namespace (split[i]) << NS_POS;
	      mask = NS_MASK << NS_POS;
	    }
	  
	  matcher_add (matcher, id, mask);
	}
    }

  g_strfreev (split);

  return matcher;
}

/**
 * g_file_attribute_matcher_ref:
 * @matcher: a #GFileAttributeMatcher.
 * 
 * References a file attribute matcher.
 * 
 * Returns: a #GFileAttributeMatcher.
 **/
GFileAttributeMatcher *
g_file_attribute_matcher_ref (GFileAttributeMatcher *matcher)
{
  g_return_val_if_fail (matcher != NULL, NULL);
  g_return_val_if_fail (matcher->ref > 0, NULL);

  g_atomic_int_inc (&matcher->ref);
  
  return matcher;
}

/**
 * g_file_attribute_matcher_unref:
 * @matcher: a #GFileAttributeMatcher.
 * 
 * Unreferences @matcher. If the reference count falls below 1, 
 * the @matcher is automatically freed.
 * 
 **/
void
g_file_attribute_matcher_unref (GFileAttributeMatcher *matcher)
{
  g_return_if_fail (matcher != NULL);
  g_return_if_fail (matcher->ref > 0);

  if (g_atomic_int_dec_and_test (&matcher->ref))
    {
      if (matcher->more_sub_matchers)
	g_array_free (matcher->more_sub_matchers, TRUE);
      
      g_free (matcher);
    }
}

/**
 * g_file_attribute_matcher_matches_only:
 * @matcher: a #GFileAttributeMatcher.
 * @attribute: a file attribute key.
 * 
 * Checks if a attribute matcher only matches a given attribute. Always
 * returns %FALSE if "*" was used when creating the matcher.
 * 
 * Returns: %TRUE if the matcher only matches @attribute. %FALSE otherwise.
 **/
gboolean
g_file_attribute_matcher_matches_only (GFileAttributeMatcher *matcher,
				       const char            *attribute)
{
  guint32 id;

  g_return_val_if_fail (matcher != NULL, FALSE);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', FALSE);

  if (matcher->all)
    return FALSE;
  
  id = lookup_attribute (attribute);

  if (matcher->sub_matchers[0].id != 0 &&
      matcher->sub_matchers[1].id == 0 &&
      matcher->sub_matchers[0].mask == 0xffffffff &&
      matcher->sub_matchers[0].id == id)
    return TRUE;
  
  return FALSE;
}

static gboolean
matcher_matches_id (GFileAttributeMatcher *matcher,
                    guint32                id)
{
  SubMatcher *sub_matchers;
  int i;
  
  for (i = 0; i < ON_STACK_MATCHERS; i++)
    {
      if (matcher->sub_matchers[i].id == 0)
	return FALSE;
      
      if (matcher->sub_matchers[i].id == (id & matcher->sub_matchers[i].mask))
	return TRUE;
    }

  if (matcher->more_sub_matchers)
    {
      sub_matchers = (SubMatcher *)matcher->more_sub_matchers->data;
      for (i = 0; i < matcher->more_sub_matchers->len; i++)
	{
	  if (sub_matchers[i].id == (id & sub_matchers[i].mask))
	    return TRUE;
	}
    }
  
  return FALSE;
}

static gboolean
g_file_attribute_matcher_matches_id (GFileAttributeMatcher *matcher,
                                     guint32                id)
{
  g_return_val_if_fail (matcher != NULL, FALSE);
  
  if (matcher->all)
    return TRUE;
  
  return matcher_matches_id (matcher, id);
}

/**
 * g_file_attribute_matcher_matches:
 * @matcher: a #GFileAttributeMatcher.
 * @attribute: a file attribute key.
 *
 * Checks if an attribute will be matched by an attribute matcher. If 
 * the matcher was created with the "*" matching string, this function
 * will always return %TRUE.
 * 
 * Returns: %TRUE if @attribute matches @matcher. %FALSE otherwise.
 **/
gboolean
g_file_attribute_matcher_matches (GFileAttributeMatcher *matcher,
				  const char            *attribute)
{
  g_return_val_if_fail (matcher != NULL, FALSE);
  g_return_val_if_fail (attribute != NULL && *attribute != '\0', FALSE);

  if (matcher->all)
    return TRUE;
  
  return matcher_matches_id (matcher, lookup_attribute (attribute));
}

/* return TRUE -> all */
/**
 * g_file_attribute_matcher_enumerate_namespace:
 * @matcher: a #GFileAttributeMatcher.
 * @ns: a string containing a file attribute namespace.
 * 
 * Checks if the matcher will match all of the keys in a given namespace.
 * This will always return %TRUE if a wildcard character is in use (e.g. if 
 * matcher was created with "std:*" and @ns is "std", or if matcher was created
 * using "*" and namespace is anything.) 
 * 
 * TODO: this is awkwardly worded.
 * 
 * Returns: %TRUE if the matcher matches all of the entries
 * in the given @ns, %FALSE otherwise.
 **/
gboolean
g_file_attribute_matcher_enumerate_namespace (GFileAttributeMatcher *matcher,
					      const char            *ns)
{
  SubMatcher *sub_matchers;
  int ns_id;
  int i;
  
  g_return_val_if_fail (matcher != NULL, FALSE);
  g_return_val_if_fail (ns != NULL && *ns != '\0', FALSE);
  
  if (matcher->all)
    return TRUE;

  ns_id = lookup_namespace (ns) << NS_POS;

  for (i = 0; i < ON_STACK_MATCHERS; i++)
    {
      if (matcher->sub_matchers[i].id == ns_id)
	return TRUE;
    }

  if (matcher->more_sub_matchers)
    {
      sub_matchers = (SubMatcher *)matcher->more_sub_matchers->data;
      for (i = 0; i < matcher->more_sub_matchers->len; i++)
	{
	  if (sub_matchers[i].id == ns_id)
	    return TRUE;
	}
    }

  matcher->iterator_ns = ns_id;
  matcher->iterator_pos = 0;
  
  return FALSE;
}

/**
 * g_file_attribute_matcher_enumerate_next:
 * @matcher: a #GFileAttributeMatcher.
 * 
 * Gets the next matched attribute from a #GFileAttributeMatcher.
 * 
 * Returns: a string containing the next attribute or %NULL if 
 * no more attribute exist.
 **/
const char *
g_file_attribute_matcher_enumerate_next (GFileAttributeMatcher *matcher)
{
  int i;
  SubMatcher *sub_matcher;
  
  g_return_val_if_fail (matcher != NULL, NULL);

  while (1)
    {
      i = matcher->iterator_pos++;

      if (i < ON_STACK_MATCHERS)
	{
	  if (matcher->sub_matchers[i].id == 0)
	    return NULL;

	  sub_matcher = &matcher->sub_matchers[i];
	}
      else
	{
	  if (matcher->more_sub_matchers == NULL)
	    return NULL;
      
	  i -= ON_STACK_MATCHERS;
	  if (i < matcher->more_sub_matchers->len)
	    sub_matcher = &g_array_index (matcher->more_sub_matchers, SubMatcher, i);
	  else
	    return NULL;
	}

      if (sub_matcher->mask == 0xffffffff &&
	  (sub_matcher->id & (NS_MASK << NS_POS)) == matcher->iterator_ns)
	return get_attribute_for_id (sub_matcher->id);
    }
}

#define __G_FILE_INFO_C__
#include "gioaliasdef.c"