g_file_info_get/set_attribute_string*(): Document the UTF-8ness.

* gio/gfileattribute.c: (_g_file_attribute_value_get_string,
_g_file_attribute_value_set_string): These use
G_FILE_ATTRIBUTE_TYPE_STRING, which is documented as UTF-8, so
document these private functions as using UTF-8.
* gio/gfileinfo.c: (g_file_info_get_attribute_string,
g_file_info_set_attribute_string, and stringv versions):
Document that the strings are UTF-8 because the implementation uses
those private functions, that use UTF-8.

This helps language bindings (such as glibmm) whose API
distinguishes between known and unknown encodings.

gio/gfileattribute.c

@@ -1,5 +1,5 @@
 /* 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
@@ -35,29 +35,29 @@
  * @short_description: Key-Value Paired File Attributes
  * @include: gio/gio.h
  * @see_also: #GFile, #GFileInfo
- * 
+ *
- * File attributes in GIO consist of a list of key-value pairs. 
+ * File attributes in GIO consist of a list of key-value pairs.
- * 
+ *
  * Keys are strings that contain a key namespace and a key name, separated
  * by a colon, e.g. "namespace:keyname". Namespaces are included to sort
- * key-value pairs by namespaces for relevance. Keys can be retrived 
+ * key-value pairs by namespaces for relevance. Keys can be retrived
- * using wildcards, e.g. "standard::*" will return all of the keys in the 
+ * using wildcards, e.g. "standard::*" will return all of the keys in the
  * "standard" namespace.
- * 
+ *
  * Values are stored within the list in #GFileAttributeValue structures.
  * Values can store different types, listed in the enum #GFileAttributeType.
- * Upon creation of a #GFileAttributeValue, the type will be set to 
+ * Upon creation of a #GFileAttributeValue, the type will be set to
- * %G_FILE_ATTRIBUTE_TYPE_INVALID. 
+ * %G_FILE_ATTRIBUTE_TYPE_INVALID.
- * 
+ *
  * The list of possible attributes for a filesystem (pointed to by a #GFile) is
- * availible as a #GFileAttributeInfoList. This list is queryable by key names 
+ * availible as a #GFileAttributeInfoList. This list is queryable by key names
  * as indicated earlier.
- * 
+ *
- * Classes that implement #GFileIface will create a #GFileAttributeInfoList and 
+ * Classes that implement #GFileIface will create a #GFileAttributeInfoList and
- * install default keys and values for their given file system, architecture, 
+ * install default keys and values for their given file system, architecture,
- * and other possible implementation details (e.g., on a UNIX system, a file 
+ * and other possible implementation details (e.g., on a UNIX system, a file
  * attribute key will be registered for the user id for a given file).
- * 
+ *
  * <para>
  * <table>
  * <title>GFileAttributes Default Namespaces</title>
@@ -66,29 +66,29 @@
  * </thead>
  * <tbody>
  * <row><entry>"standard"</entry><entry>The "Standard" namespace. General file
- * information that any application may need should be put in this namespace. 
+ * information that any application may need should be put in this namespace.
- * Examples include the file's name, type, and size.</entry></row> 
+ * Examples include the file's name, type, and size.</entry></row>
- * <row><entry>"etag"</entry><entry>The <link linkend="gfile-etag">"Entity Tag"</link> 
+ * <row><entry>"etag"</entry><entry>The <link linkend="gfile-etag">"Entity Tag"</link>
- * namespace. Currently, the only key in this namespace is "value", which contains 
+ * namespace. Currently, the only key in this namespace is "value", which contains
  * the value of the current entity tag.</entry></row>
- * <row><entry>"id"</entry><entry>The "Identification" namespace. This 
+ * <row><entry>"id"</entry><entry>The "Identification" namespace. This
  * namespace is used by file managers and applications that list directories
  * to check for loops and to uniquely identify files.</entry></row>
  * <row><entry>"access"</entry><entry>The "Access" namespace. Used to check
  * if a user has the proper privilidges to access files and perform
- * file operations. Keys in this namespace are made to be generic 
+ * file operations. Keys in this namespace are made to be generic
- * and easily understood, e.g. the "can_read" key is %TRUE if 
+ * and easily understood, e.g. the "can_read" key is %TRUE if
  * the current user has permission to read the file. UNIX permissions and
  * NTFS ACLs in Windows should be mapped to these values.</entry></row>
- * <row><entry>"mountable"</entry><entry>The "Mountable" namespace. Includes 
+ * <row><entry>"mountable"</entry><entry>The "Mountable" namespace. Includes
  * simple boolean keys for checking if a file or path supports mount operations, e.g.
  * mount, unmount, eject. These are used for files of type %G_FILE_TYPE_MOUNTABLE.</entry></row>
- * <row><entry>"time"</entry><entry>The "Time" namespace. Includes file 
+ * <row><entry>"time"</entry><entry>The "Time" namespace. Includes file
  * access, changed, created times. </entry></row>
  * <row><entry>"unix"</entry><entry>The "Unix" namespace. Includes UNIX-specific
- * information and may not be available for all files. Examples include 
+ * information and may not be available for all files. Examples include
  * the UNIX "UID", "GID", etc.</entry></row>
- * <row><entry>"dos"</entry><entry>The "DOS" namespace. Includes DOS-specific 
+ * <row><entry>"dos"</entry><entry>The "DOS" namespace. Includes DOS-specific
  * information and may not be available for all files. Examples include
  * "is_system" for checking if a file is marked as a system file, and "is_archive"
  * for checking if a file is marked as an archive file.</entry></row>
@@ -96,8 +96,8 @@
  * about who owns a file. May not be available for all file systems. Examples include
  * "user" for getting the user name of the file owner. This information is often mapped from
  * some backend specific data such as a unix UID.</entry></row>
- * <row><entry>"thumbnail"</entry><entry>The "Thumbnail" namespace. Includes 
+ * <row><entry>"thumbnail"</entry><entry>The "Thumbnail" namespace. Includes
- * information about file thumbnails and their location within the file system. Exaples of 
+ * information about file thumbnails and their location within the file system. Exaples of
  * keys in this namespace include "path" to get the location of a thumbnail, and "failed"
  * to check if thumbnailing of the file failed.</entry></row>
  * <row><entry>"filesystem"</entry><entry>The "Filesystem" namespace. Gets information
@@ -105,14 +105,14 @@
  * space is left available, and the overall size of the file system.</entry></row>
  * <row><entry>"gvfs"</entry><entry>The "GVFS" namespace. Keys in this namespace
  * contain information about the current GVFS backend in use. </entry></row>
- * <row><entry>"xattr"</entry><entry>The "xattr" namespace. Gets information 
+ * <row><entry>"xattr"</entry><entry>The "xattr" namespace. Gets information
  * about extended user attributes. See attr(5). The "user." prefix of the
  * extended user attribute name is stripped away when constructing keys in
- * this namespace, e.g. "xattr::mime_type" for the extended attribute with 
+ * this namespace, e.g. "xattr::mime_type" for the extended attribute with
  * the name "user.mime_type". Note that this information is only available
  * if GLib has been built with extended attribute support.</entry></row>
- * <row><entry>"xattr-sys"</entry><entry>The "xattr-sys" namespace. 
+ * <row><entry>"xattr-sys"</entry><entry>The "xattr-sys" namespace.
- * Gets information about extended attributes which are not user-specific. 
+ * Gets information about extended attributes which are not user-specific.
  * See attr(5). Note that this information is only available if GLib
  * has been built with extended attribute support.</entry></row>
  * <row><entry>"selinux"</entry><entry>The "SELinux" namespace. Includes
@@ -122,14 +122,14 @@
  * </tgroup>
  * </table>
  * </para>
- * 
+ *
  * Please note that these are not all of the possible namespaces.
- * More namespaces can be added from GIO modules or by individual applications. 
+ * More namespaces can be added from GIO modules or by individual applications.
  * For more information about writing GIO modules, see #GIOModule.
  *
- * <!-- TODO: Implementation note about using extended attributes on supported 
+ * <!-- TODO: Implementation note about using extended attributes on supported
  * file systems -->
- * 
+ *
  * <para><table>
  * <title>GFileAttributes Built-in Keys and Value Types</title>
  * <tgroup cols='3' align='left'><thead>
@@ -199,21 +199,21 @@
  * <row><entry>%G_FILE_ATTRIBUTE_GVFS_BACKEND</entry><entry>gvfs::backend</entry><entry>string</entry></row>
  * <row><entry>%G_FILE_ATTRIBUTE_SELINUX_CONTEXT</entry><entry>selinux::context</entry><entry>string</entry></row>
  * </tbody></tgroup></table></para>
- *  
+ *
- * Note that there are no predefined keys in the "xattr" and "xattr-sys" 
+ * Note that there are no predefined keys in the "xattr" and "xattr-sys"
  * namespaces. Keys for the "xattr" namespace are constructed by stripping
  * away the "user." prefix from the extended user attribute, and prepending
- * "xattr::". Keys for the "xattr-sys" namespace are constructed by 
+ * "xattr::". Keys for the "xattr-sys" namespace are constructed by
  * concatenating "xattr-sys::" with the extended attribute name. All extended
  * attribute values are returned as hex-encoded strings in which bytes outside
  * the ASCII range are encoded as hexadecimal escape sequences of the form
  * \x<replaceable>nn</replaceable>.
- **/ 
+ **/
 
 /*
  * _g_file_attribute_value_free:
- * @attr: a #GFileAttributeValue. 
+ * @attr: a #GFileAttributeValue.
- * 
+ *
  * Frees the memory used by @attr.
  *
  **/
@@ -230,9 +230,9 @@ _g_file_attribute_value_free (GFileAttributeValue *attr)
  * _g_file_attribute_value_clear:
  * @attr: a #GFileAttributeValue.
  *
- * Clears the value of @attr and sets its type to 
+ * Clears the value of @attr and sets its type to
  * %G_FILE_ATTRIBUTE_TYPE_INVALID.
- * 
+ *
  **/
 void
 _g_file_attribute_value_clear (GFileAttributeValue *attr)
@@ -242,14 +242,14 @@ _g_file_attribute_value_clear (GFileAttributeValue *attr)
   if (attr->type == G_FILE_ATTRIBUTE_TYPE_STRING ||
       attr->type == G_FILE_ATTRIBUTE_TYPE_BYTE_STRING)
     g_free (attr->u.string);
-  
+
   if (attr->type == G_FILE_ATTRIBUTE_TYPE_STRINGV)
     g_strfreev (attr->u.stringv);
 
   if (attr->type == G_FILE_ATTRIBUTE_TYPE_OBJECT &&
       attr->u.obj != NULL)
     g_object_unref (attr->u.obj);
-  
+
   attr->type = G_FILE_ATTRIBUTE_TYPE_INVALID;
 }
 
@@ -257,7 +257,7 @@ _g_file_attribute_value_clear (GFileAttributeValue *attr)
  * g_file_attribute_value_set:
  * @attr: a #GFileAttributeValue to set the value in.
  * @new_value: a #GFileAttributeValue to get the value from.
- * 
+ *
  * Sets an attribute's value from another attribute.
  **/
 void
@@ -273,7 +273,7 @@ _g_file_attribute_value_set (GFileAttributeValue        *attr,
   if (attr->type == G_FILE_ATTRIBUTE_TYPE_STRING ||
       attr->type == G_FILE_ATTRIBUTE_TYPE_BYTE_STRING)
     attr->u.string = g_strdup (attr->u.string);
-  
+
   if (attr->type == G_FILE_ATTRIBUTE_TYPE_STRINGV)
     attr->u.stringv = g_strdupv (attr->u.stringv);
 
@@ -284,9 +284,9 @@ _g_file_attribute_value_set (GFileAttributeValue        *attr,
 
 /*
  * _g_file_attribute_value_new:
- * 
+ *
  * Creates a new file attribute.
- * 
+ *
  * Returns: a #GFileAttributeValue.
  **/
 GFileAttributeValue *
@@ -318,9 +318,9 @@ _g_file_attribute_value_peek_as_pointer (GFileAttributeValue *attr)
 /*
  * g_file_attribute_value_dup:
  * @other: a #GFileAttributeValue to duplicate.
- * 
+ *
  * Duplicates a file attribute.
- * 
+ *
  * Returns: a duplicate of the @other.
  **/
 GFileAttributeValue *
@@ -466,7 +466,7 @@ _g_file_attribute_value_as_string (const GFileAttributeValue *attr)
  * Gets the string from a file attribute value. If the value is not the
  * right type then %NULL will be returned.
  *
- * Returns: the string value contained within the attribute, or %NULL.
+ * Returns: the UTF-8 string value contained within the attribute, or %NULL.
  */
 const char *
 _g_file_attribute_value_get_string (const GFileAttributeValue *attr)
@@ -695,9 +695,9 @@ _g_file_attribute_value_set_from_pointer (GFileAttributeValue *value,
 /*
  * _g_file_attribute_value_set_string:
  * @attr: a #GFileAttributeValue.
- * @string: a string to set within the type.
+ * @string: a UTF-8 string to set within the type.
  *
- * Sets the attribute value to a given string.
+ * Sets the attribute value to a given UTF-8 string.
  */
 void
 _g_file_attribute_value_set_string (GFileAttributeValue *attr,