gvariant.c 130 KB
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/*
 * Copyright © 2007, 2008 Ryan Lortie
 * Copyright © 2010 Codethink Limited
 *
 * 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 licence, 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: Ryan Lortie <desrt@desrt.ca>
 */

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/* Prologue {{{1 */

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#include "config.h"

#include <glib/gvariant-serialiser.h>
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#include "gvariant-internal.h"
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#include <glib/gvariant-core.h>
#include <glib/gtestutils.h>
#include <glib/gstrfuncs.h>
#include <glib/ghash.h>
#include <glib/gmem.h>

#include <string.h>


/**
 * SECTION: gvariant
 * @title: GVariant
 * @short_description: strongly typed value datatype
 * @see_also: GVariantType
 *
 * #GVariant is a variant datatype; it stores a value along with
 * information about the type of that value.  The range of possible
 * values is determined by the type.  The type system used by #GVariant
 * is #GVariantType.
 *
 * #GVariant instances always have a type and a value (which are given
 * at construction time).  The type and value of a #GVariant instance
 * can never change other than by the #GVariant itself being
 * destroyed.  A #GVariant can not contain a pointer.
 *
 * #GVariant is reference counted using g_variant_ref() and
 * g_variant_unref().  #GVariant also has floating reference counts --
 * see g_variant_ref_sink().
 *
 * #GVariant is completely threadsafe.  A #GVariant instance can be
 * concurrently accessed in any way from any number of threads without
 * problems.
 *
 * #GVariant is heavily optimised for dealing with data in serialised
 * form.  It works particularly well with data located in memory-mapped
 * files.  It can perform nearly all deserialisation operations in a
 * small constant time, usually touching only a single memory page.
 * Serialised #GVariant data can also be sent over the network.
 *
 * #GVariant is largely compatible with DBus.  Almost all types of
 * #GVariant instances can be sent over DBus.  See #GVariantType for
 * exceptions.
 *
 * For convenience to C programmers, #GVariant features powerful
 * varargs-based value construction and destruction.  This feature is
 * designed to be embedded in other libraries.
 *
 * There is a Python-inspired text language for describing #GVariant
 * values.  #GVariant includes a printer for this language and a parser
 * with type inferencing.
 *
 * <refsect2>
 *  <title>Memory Use</title>
 *  <para>
 *   #GVariant tries to be quite efficient with respect to memory use.
 *   This section gives a rough idea of how much memory is used by the
 *   current implementation.  The information here is subject to change
 *   in the future.
 *  </para>
 *  <para>
 *   The memory allocated by #GVariant can be grouped into 4 broad
 *   purposes: memory for serialised data, memory for the type
 *   information cache, buffer management memory and memory for the
 *   #GVariant structure itself.
 *  </para>
 *  <refsect3>
 *   <title>Serialised Data Memory</title>
 *   <para>
 *    This is the memory that is used for storing GVariant data in
 *    serialised form.  This is what would be sent over the network or
 *    what would end up on disk.
 *   </para>
 *   <para>
 *    The amount of memory required to store a boolean is 1 byte.  16,
 *    32 and 64 bit integers and double precision floating point numbers
 *    use their "natural" size.  Strings (including object path and
 *    signature strings) are stored with a nul terminator, and as such
 *    use the length of the string plus 1 byte.
 *   </para>
 *   <para>
 *    Maybe types use no space at all to represent the null value and
 *    use the same amount of space (sometimes plus one byte) as the
 *    equivalent non-maybe-typed value to represent the non-null case.
 *   </para>
 *   <para>
 *    Arrays use the amount of space required to store each of their
 *    members, concatenated.  Additionally, if the items stored in an
 *    array are not of a fixed-size (ie: strings, other arrays, etc)
 *    then an additional framing offset is stored for each item.  The
 *    size of this offset is either 1, 2 or 4 bytes depending on the
 *    overall size of the container.  Additionally, extra padding bytes
 *    are added as required for alignment of child values.
 *   </para>
 *   <para>
 *    Tuples (including dictionary entries) use the amount of space
 *    required to store each of their members, concatenated, plus one
 *    framing offset (as per arrays) for each non-fixed-sized item in
 *    the tuple, except for the last one.  Additionally, extra padding
 *    bytes are added as required for alignment of child values.
 *   </para>
 *   <para>
 *    Variants use the same amount of space as the item inside of the
 *    variant, plus 1 byte, plus the length of the type string for the
 *    item inside the variant.
 *   </para>
 *   <para>
 *    As an example, consider a dictionary mapping strings to variants.
 *    In the case that the dictionary is empty, 0 bytes are required for
 *    the serialisation.
 *   </para>
 *   <para>
 *    If we add an item "width" that maps to the int32 value of 500 then
 *    we will use 4 byte to store the int32 (so 6 for the variant
 *    containing it) and 6 bytes for the string.  The variant must be
 *    aligned to 8 after the 6 bytes of the string, so that's 2 extra
 *    bytes.  6 (string) + 2 (padding) + 6 (variant) is 14 bytes used
 *    for the dictionary entry.  An additional 1 byte is added to the
 *    array as a framing offset making a total of 15 bytes.
 *   </para>
 *   <para>
 *    If we add another entry, "title" that maps to a nullable string
 *    that happens to have a value of null, then we use 0 bytes for the
 *    null value (and 3 bytes for the variant to contain it along with
 *    its type string) plus 6 bytes for the string.  Again, we need 2
 *    padding bytes.  That makes a total of 6 + 2 + 3 = 11 bytes.
 *   </para>
 *   <para>
 *    We now require extra padding between the two items in the array.
 *    After the 14 bytes of the first item, that's 2 bytes required.  We
 *    now require 2 framing offsets for an extra two bytes.  14 + 2 + 11
 *    + 2 = 29 bytes to encode the entire two-item dictionary.
 *   </para>
 *  </refsect3>
 *  <refsect3>
 *   <title>Type Information Cache</title>
 *   <para>
 *    For each GVariant type that currently exists in the program a type
 *    information structure is kept in the type information cache.  The
 *    type information structure is required for rapid deserialisation.
 *   </para>
 *   <para>
 *    Continuing with the above example, if a #GVariant exists with the
 *    type "a{sv}" then a type information struct will exist for
 *    "a{sv}", "{sv}", "s", and "v".  Multiple uses of the same type
 *    will share the same type information.  Additionally, all
 *    single-digit types are stored in read-only static memory and do
 *    not contribute to the writable memory footprint of a program using
 *    #GVariant.
 *   </para>
 *   <para>
 *    Aside from the type information structures stored in read-only
 *    memory, there are two forms of type information.  One is used for
 *    container types where there is a single element type: arrays and
 *    maybe types.  The other is used for container types where there
 *    are multiple element types: tuples and dictionary entries.
 *   </para>
 *   <para>
 *    Array type info structures are 6 * sizeof (void *), plus the
 *    memory required to store the type string itself.  This means that
 *    on 32bit systems, the cache entry for "a{sv}" would require 30
 *    bytes of memory (plus malloc overhead).
 *   </para>
 *   <para>
 *    Tuple type info structures are 6 * sizeof (void *), plus 4 *
 *    sizeof (void *) for each item in the tuple, plus the memory
 *    required to store the type string itself.  A 2-item tuple, for
 *    example, would have a type information structure that consumed
 *    writable memory in the size of 14 * sizeof (void *) (plus type
 *    string)  This means that on 32bit systems, the cache entry for
 *    "{sv}" would require 61 bytes of memory (plus malloc overhead).
 *   </para>
 *   <para>
 *    This means that in total, for our "a{sv}" example, 91 bytes of
 *    type information would be allocated.
 *   </para>
 *   <para>
 *    The type information cache, additionally, uses a #GHashTable to
 *    store and lookup the cached items and stores a pointer to this
 *    hash table in static storage.  The hash table is freed when there
 *    are zero items in the type cache.
 *   </para>
 *   <para>
 *    Although these sizes may seem large it is important to remember
 *    that a program will probably only have a very small number of
 *    different types of values in it and that only one type information
 *    structure is required for many different values of the same type.
 *   </para>
 *  </refsect3>
 *  <refsect3>
 *   <title>Buffer Management Memory</title>
 *   <para>
 *    #GVariant uses an internal buffer management structure to deal
 *    with the various different possible sources of serialised data
 *    that it uses.  The buffer is responsible for ensuring that the
 *    correct call is made when the data is no longer in use by
 *    #GVariant.  This may involve a g_free() or a g_slice_free() or
 *    even g_mapped_file_unref().
 *   </para>
 *   <para>
 *    One buffer management structure is used for each chunk of
 *    serialised data.  The size of the buffer management structure is 4
 *    * (void *).  On 32bit systems, that's 16 bytes.
 *   </para>
 *  </refsect3>
 *  <refsect3>
 *   <title>GVariant structure</title>
 *   <para>
 *    The size of a #GVariant structure is 6 * (void *).  On 32 bit
 *    systems, that's 24 bytes.
 *   </para>
 *   <para>
 *    #GVariant structures only exist if they are explicitly created
 *    with API calls.  For example, if a #GVariant is constructed out of
 *    serialised data for the example given above (with the dictionary)
 *    then although there are 9 individual values that comprise the
 *    entire dictionary (two keys, two values, two variants containing
 *    the values, two dictionary entries, plus the dictionary itself),
 *    only 1 #GVariant instance exists -- the one refering to the
 *    dictionary.
 *   </para>
 *   <para>
 *    If calls are made to start accessing the other values then
 *    #GVariant instances will exist for those values only for as long
 *    as they are in use (ie: until you call g_variant_unref()).  The
 *    type information is shared.  The serialised data and the buffer
 *    management structure for that serialised data is shared by the
 *    child.
 *   </para>
 *  </refsect3>
 *  <refsect3>
 *   <title>Summary</title>
 *   <para>
 *    To put the entire example together, for our dictionary mapping
 *    strings to variants (with two entries, as given above), we are
 *    using 91 bytes of memory for type information, 29 byes of memory
 *    for the serialised data, 16 bytes for buffer management and 24
 *    bytes for the #GVariant instance, or a total of 160 bytes, plus
 *    malloc overhead.  If we were to use g_variant_get_child_value() to
 *    access the two dictionary entries, we would use an additional 48
 *    bytes.  If we were to have other dictionaries of the same type, we
 *    would use more memory for the serialised data and buffer
 *    management for those dictionaries, but the type information would
 *    be shared.
 *   </para>
 *  </refsect3>
 * </refsect2>
 */

/* definition of GVariant structure is in gvariant-core.c */

/* this is a g_return_val_if_fail() for making
 * sure a (GVariant *) has the required type.
 */
#define TYPE_CHECK(value, TYPE, val) \
  if G_UNLIKELY (!g_variant_is_of_type (value, TYPE)) {           \
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    g_return_if_fail_warning (G_LOG_DOMAIN, G_STRFUNC,            \
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                              "g_variant_is_of_type (" #value     \
                              ", " #TYPE ")");                    \
    return val;                                                   \
  }

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/* Numeric Type Constructor/Getters {{{1 */
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/* < private >
 * g_variant_new_from_trusted:
 * @type: the #GVariantType
 * @data: the data to use
 * @size: the size of @data
 * @returns: a new floating #GVariant
 *
 * Constructs a new trusted #GVariant instance from the provided data.
 * This is used to implement g_variant_new_* for all the basic types.
 */
static GVariant *
g_variant_new_from_trusted (const GVariantType *type,
                            gconstpointer       data,
                            gsize               size)
{
  GVariant *value;
  GBuffer *buffer;

  buffer = g_buffer_new_from_data (data, size);
  value = g_variant_new_from_buffer (type, buffer, TRUE);
  g_buffer_unref (buffer);

  return value;
}

/**
 * g_variant_new_boolean:
 * @boolean: a #gboolean value
 * @returns: a new boolean #GVariant instance
 *
 * Creates a new boolean #GVariant instance -- either %TRUE or %FALSE.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_new_boolean (gboolean value)
{
  guchar v = value;

  return g_variant_new_from_trusted (G_VARIANT_TYPE_BOOLEAN, &v, 1);
}

/**
 * g_variant_get_boolean:
 * @value: a boolean #GVariant instance
 * @returns: %TRUE or %FALSE
 *
 * Returns the boolean value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_BOOLEAN.
 *
 * Since: 2.24
 **/
gboolean
g_variant_get_boolean (GVariant *value)
{
  const guchar *data;

  TYPE_CHECK (value, G_VARIANT_TYPE_BOOLEAN, FALSE);

  data = g_variant_get_data (value);

  return data != NULL ? *data != 0 : FALSE;
}

/* the constructors and accessors for byte, int{16,32,64}, handles and
 * doubles all look pretty much exactly the same, so we reduce
 * copy/pasting here.
 */
#define NUMERIC_TYPE(TYPE, type, ctype) \
  GVariant *g_variant_new_##type (ctype value) {                \
    return g_variant_new_from_trusted (G_VARIANT_TYPE_##TYPE,   \
                                       &value, sizeof value);   \
  }                                                             \
  ctype g_variant_get_##type (GVariant *value) {                \
    const ctype *data;                                          \
    TYPE_CHECK (value, G_VARIANT_TYPE_ ## TYPE, 0);             \
    data = g_variant_get_data (value);                          \
    return data != NULL ? *data : 0;                            \
  }


/**
 * g_variant_new_byte:
 * @byte: a #guint8 value
 * @returns: a new byte #GVariant instance
 *
 * Creates a new byte #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_byte:
 * @value: a byte #GVariant instance
 * @returns: a #guchar
 *
 * Returns the byte value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_BYTE.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (BYTE, byte, guchar)

/**
 * g_variant_new_int16:
 * @int16: a #gint16 value
 * @returns: a new int16 #GVariant instance
 *
 * Creates a new int16 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_int16:
 * @value: a int16 #GVariant instance
 * @returns: a #gint16
 *
 * Returns the 16-bit signed integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_INT16.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (INT16, int16, gint16)

/**
 * g_variant_new_uint16:
 * @uint16: a #guint16 value
 * @returns: a new uint16 #GVariant instance
 *
 * Creates a new uint16 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_uint16:
 * @value: a uint16 #GVariant instance
 * @returns: a #guint16
 *
 * Returns the 16-bit unsigned integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_UINT16.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (UINT16, uint16, guint16)

/**
 * g_variant_new_int32:
 * @int32: a #gint32 value
 * @returns: a new int32 #GVariant instance
 *
 * Creates a new int32 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_int32:
 * @value: a int32 #GVariant instance
 * @returns: a #gint32
 *
 * Returns the 32-bit signed integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_INT32.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (INT32, int32, gint32)

/**
 * g_variant_new_uint32:
 * @uint32: a #guint32 value
 * @returns: a new uint32 #GVariant instance
 *
 * Creates a new uint32 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_uint32:
 * @value: a uint32 #GVariant instance
 * @returns: a #guint32
 *
 * Returns the 32-bit unsigned integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_UINT32.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (UINT32, uint32, guint32)

/**
 * g_variant_new_int64:
 * @int64: a #gint64 value
 * @returns: a new int64 #GVariant instance
 *
 * Creates a new int64 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_int64:
 * @value: a int64 #GVariant instance
 * @returns: a #gint64
 *
 * Returns the 64-bit signed integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_INT64.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (INT64, int64, gint64)

/**
 * g_variant_new_uint64:
 * @uint64: a #guint64 value
 * @returns: a new uint64 #GVariant instance
 *
 * Creates a new uint64 #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_uint64:
 * @value: a uint64 #GVariant instance
 * @returns: a #guint64
 *
 * Returns the 64-bit unsigned integer value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_UINT64.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (UINT64, uint64, guint64)

/**
 * g_variant_new_handle:
 * @handle: a #gint32 value
 * @returns: a new handle #GVariant instance
 *
 * Creates a new handle #GVariant instance.
 *
 * By convention, handles are indexes into an array of file descriptors
 * that are sent alongside a DBus message.  If you're not interacting
 * with DBus, you probably don't need them.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_handle:
 * @value: a handle #GVariant instance
 * @returns: a #gint32
 *
 * Returns the 32-bit signed integer value of @value.
 *
 * It is an error to call this function with a @value of any type other
 * than %G_VARIANT_TYPE_HANDLE.
 *
 * By convention, handles are indexes into an array of file descriptors
 * that are sent alongside a DBus message.  If you're not interacting
 * with DBus, you probably don't need them.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (HANDLE, handle, gint32)

/**
 * g_variant_new_double:
 * @floating: a #gdouble floating point value
 * @returns: a new double #GVariant instance
 *
 * Creates a new double #GVariant instance.
 *
 * Since: 2.24
 **/
/**
 * g_variant_get_double:
 * @value: a double #GVariant instance
 * @returns: a #gdouble
 *
 * Returns the double precision floating point value of @value.
 *
 * It is an error to call this function with a @value of any type
 * other than %G_VARIANT_TYPE_DOUBLE.
 *
 * Since: 2.24
 **/
NUMERIC_TYPE (DOUBLE, double, gdouble)

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/* Container type Constructor / Deconstructors {{{1 */
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/**
 * g_variant_new_maybe:
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 * @child_type: (allow-none): the #GVariantType of the child, or %NULL
 * @child: (allow-none): the child value, or %NULL
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 * @returns: a new #GVariant maybe instance
 *
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 * Depending on if @child is %NULL, either wraps @child inside of a
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 * maybe container or creates a Nothing instance for the given @type.
 *
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 * At least one of @child_type and @child must be non-%NULL.
 * If @child_type is non-%NULL then it must be a definite type.
 * If they are both non-%NULL then @child_type must be the type
 * of @child.
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 *
 * Since: 2.24
 **/
GVariant *
g_variant_new_maybe (const GVariantType *child_type,
                     GVariant           *child)
{
  GVariantType *maybe_type;
  GVariant *value;

  g_return_val_if_fail (child_type == NULL || g_variant_type_is_definite
                        (child_type), 0);
  g_return_val_if_fail (child_type != NULL || child != NULL, NULL);
  g_return_val_if_fail (child_type == NULL || child == NULL ||
                        g_variant_is_of_type (child, child_type),
                        NULL);

  if (child_type == NULL)
    child_type = g_variant_get_type (child);

  maybe_type = g_variant_type_new_maybe (child_type);

  if (child != NULL)
    {
      GVariant **children;
      gboolean trusted;

      children = g_new (GVariant *, 1);
      children[0] = g_variant_ref_sink (child);
      trusted = g_variant_is_trusted (children[0]);

      value = g_variant_new_from_children (maybe_type, children, 1, trusted);
    }
  else
    value = g_variant_new_from_children (maybe_type, NULL, 0, TRUE);

  g_variant_type_free (maybe_type);

  return value;
}

/**
 * g_variant_get_maybe:
 * @value: a maybe-typed value
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 * @returns: (allow-none): the contents of @value, or %NULL
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 *
 * Given a maybe-typed #GVariant instance, extract its value.  If the
 * value is Nothing, then this function returns %NULL.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_get_maybe (GVariant *value)
{
  TYPE_CHECK (value, G_VARIANT_TYPE_MAYBE, NULL);

  if (g_variant_n_children (value))
    return g_variant_get_child_value (value, 0);

  return NULL;
}

/**
 * g_variant_new_variant:
 * @value: a #GVariance instance
 * @returns: a new variant #GVariant instance
 *
 * Boxes @value.  The result is a #GVariant instance representing a
 * variant containing the original value.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_new_variant (GVariant *value)
{
  g_return_val_if_fail (value != NULL, NULL);

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  g_variant_ref_sink (value);

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  return g_variant_new_from_children (G_VARIANT_TYPE_VARIANT,
                                      g_memdup (&value, sizeof value),
                                      1, g_variant_is_trusted (value));
}

/**
 * g_variant_get_variant:
 * @value: a variant #GVariance instance
 * @returns: the item contained in the variant
 *
 * Unboxes @value.  The result is the #GVariant instance that was
 * contained in @value.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_get_variant (GVariant *value)
{
  TYPE_CHECK (value, G_VARIANT_TYPE_VARIANT, NULL);

  return g_variant_get_child_value (value, 0);
}

/**
706
 * g_variant_new_array:
707 708 709
 * @child_type: (allow-none): the element type of the new array
 * @children: (allow-none) (array length=n_children): an array of
 *            #GVariant pointers, the children
710 711
 * @n_children: the length of @children
 * @returns: a new #GVariant array
712
 *
713 714 715 716 717 718 719 720 721 722 723 724
 * Creates a new #GVariant array from @children.
 *
 * @child_type must be non-%NULL if @n_children is zero.  Otherwise, the
 * child type is determined by inspecting the first element of the
 * @children array.  If @child_type is non-%NULL then it must be a
 * definite type.
 *
 * The items of the array are taken from the @children array.  No entry
 * in the @children array may be %NULL.
 *
 * All items in the array must have the same type, which must be the
 * same as @child_type, if given.
725 726 727 728
 *
 * Since: 2.24
 **/
GVariant *
729 730 731
g_variant_new_array (const GVariantType *child_type,
                     GVariant * const   *children,
                     gsize               n_children)
732
{
733 734 735 736 737
  GVariantType *array_type;
  GVariant **my_children;
  gboolean trusted;
  GVariant *value;
  gsize i;
738

739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
  g_return_val_if_fail (n_children > 0 || child_type != NULL, NULL);
  g_return_val_if_fail (n_children == 0 || children != NULL, NULL);
  g_return_val_if_fail (child_type == NULL ||
                        g_variant_type_is_definite (child_type), NULL);

  my_children = g_new (GVariant *, n_children);
  trusted = TRUE;

  if (child_type == NULL)
    child_type = g_variant_get_type (children[0]);
  array_type = g_variant_type_new_array (child_type);

  for (i = 0; i < n_children; i++)
    {
      TYPE_CHECK (children[i], child_type, NULL);
      my_children[i] = g_variant_ref_sink (children[i]);
      trusted &= g_variant_is_trusted (children[i]);
    }

  value = g_variant_new_from_children (array_type, my_children,
                                       n_children, trusted);
  g_variant_type_free (array_type);

  return value;
763 764
}

765 766
/*< private >
 * g_variant_make_tuple_type:
767
 * @children: (array length=n_children): an array of GVariant *
768
 * @n_children: the length of @children
769
 *
770
 * Return the type of a tuple containing @children as its items.
771
 **/
772 773 774
static GVariantType *
g_variant_make_tuple_type (GVariant * const *children,
                           gsize             n_children)
775
{
776 777 778
  const GVariantType **types;
  GVariantType *type;
  gsize i;
779

780 781 782 783 784 785 786 787 788
  types = g_new (const GVariantType *, n_children);

  for (i = 0; i < n_children; i++)
    types[i] = g_variant_get_type (children[i]);

  type = g_variant_type_new_tuple (types, n_children);
  g_free (types);

  return type;
789 790 791
}

/**
792
 * g_variant_new_tuple:
793
 * @children: (array length=n_children): the items to make the tuple out of
794 795
 * @n_children: the length of @children
 * @returns: a new #GVariant tuple
796
 *
797 798 799
 * Creates a new tuple #GVariant out of the items in @children.  The
 * type is determined from the types of @children.  No entry in the
 * @children array may be %NULL.
800
 *
801
 * If @n_children is 0 then the unit tuple is constructed.
802 803 804
 *
 * Since: 2.24
 **/
805 806 807
GVariant *
g_variant_new_tuple (GVariant * const *children,
                     gsize             n_children)
808
{
809 810 811 812 813
  GVariantType *tuple_type;
  GVariant **my_children;
  gboolean trusted;
  GVariant *value;
  gsize i;
814

815 816 817 818
  g_return_val_if_fail (n_children == 0 || children != NULL, NULL);

  my_children = g_new (GVariant *, n_children);
  trusted = TRUE;
819

820 821 822 823 824
  for (i = 0; i < n_children; i++)
    {
      my_children[i] = g_variant_ref_sink (children[i]);
      trusted &= g_variant_is_trusted (children[i]);
    }
825

826 827 828 829 830 831 832 833 834 835 836 837
  tuple_type = g_variant_make_tuple_type (children, n_children);
  value = g_variant_new_from_children (tuple_type, my_children,
                                       n_children, trusted);
  g_variant_type_free (tuple_type);

  return value;
}

/*< private >
 * g_variant_make_dict_entry_type:
 * @key: a #GVariant, the key
 * @val: a #GVariant, the value
838
 *
839 840
 * Return the type of a dictionary entry containing @key and @val as its
 * children.
841
 **/
842 843 844
static GVariantType *
g_variant_make_dict_entry_type (GVariant *key,
                                GVariant *val)
845
{
846 847
  return g_variant_type_new_dict_entry (g_variant_get_type (key),
                                        g_variant_get_type (val));
848 849 850
}

/**
851 852 853 854
 * g_variant_new_dict_entry:
 * @key: a basic #GVariant, the key
 * @value: a #GVariant, the value
 * @returns: a new dictionary entry #GVariant
855
 *
856 857
 * Creates a new dictionary entry #GVariant.  @key and @value must be
 * non-%NULL.
858
 *
859
 * @key must be a value of a basic type (ie: not a container).
860 861 862
 *
 * Since: 2.24
 **/
863 864 865
GVariant *
g_variant_new_dict_entry (GVariant *key,
                          GVariant *value)
866
{
867 868 869
  GVariantType *dict_type;
  GVariant **children;
  gboolean trusted;
870

871 872
  g_return_val_if_fail (key != NULL && value != NULL, NULL);
  g_return_val_if_fail (!g_variant_is_container (key), NULL);
873

874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
  children = g_new (GVariant *, 2);
  children[0] = g_variant_ref_sink (key);
  children[1] = g_variant_ref_sink (value);
  trusted = g_variant_is_trusted (key) && g_variant_is_trusted (value);

  dict_type = g_variant_make_dict_entry_type (key, value);
  value = g_variant_new_from_children (dict_type, children, 2, trusted);
  g_variant_type_free (dict_type);

  return value;
}

/**
 * g_variant_get_fixed_array:
 * @value: a #GVariant array with fixed-sized elements
 * @n_elements: a pointer to the location to store the number of items
 * @element_size: the size of each element
891
 * @returns: (array length=n_elements): a pointer to the fixed array
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
 *
 * Provides access to the serialised data for an array of fixed-sized
 * items.
 *
 * @value must be an array with fixed-sized elements.  Numeric types are
 * fixed-size as are tuples containing only other fixed-sized types.
 *
 * @element_size must be the size of a single element in the array.  For
 * example, if calling this function for an array of 32 bit integers,
 * you might say <code>sizeof (gint32)</code>.  This value isn't used
 * except for the purpose of a double-check that the form of the
 * seralised data matches the caller's expectation.
 *
 * @n_elements, which must be non-%NULL is set equal to the number of
 * items in the array.
 *
 * Since: 2.24
 **/
gconstpointer
g_variant_get_fixed_array (GVariant *value,
                           gsize    *n_elements,
                           gsize     element_size)
{
  GVariantTypeInfo *array_info;
  gsize array_element_size;
  gconstpointer data;
  gsize size;

  TYPE_CHECK (value, G_VARIANT_TYPE_ARRAY, NULL);

  g_return_val_if_fail (n_elements != NULL, NULL);
  g_return_val_if_fail (element_size > 0, NULL);

  array_info = g_variant_get_type_info (value);
  g_variant_type_info_query_element (array_info, NULL, &array_element_size);

  g_return_val_if_fail (array_element_size, NULL);

  if G_UNLIKELY (array_element_size != element_size)
    {
      if (array_element_size)
        g_critical ("g_variant_get_fixed_array: assertion "
                    "`g_variant_array_has_fixed_size (value, element_size)' "
                    "failed: array size %"G_GSIZE_FORMAT" does not match "
                    "given element_size %"G_GSIZE_FORMAT".",
                    array_element_size, element_size);
      else
        g_critical ("g_variant_get_fixed_array: assertion "
                    "`g_variant_array_has_fixed_size (value, element_size)' "
                    "failed: array does not have fixed size.");
    }

  data = g_variant_get_data (value);
  size = g_variant_get_size (value);

  if (size % element_size)
    *n_elements = 0;
  else
    *n_elements = size / element_size;

  if (*n_elements)
    return data;

  return NULL;
}

/* String type constructor/getters/validation {{{1 */
/**
 * g_variant_new_string:
961
 * @string: a normal utf8 nul-terminated string
962 963 964 965
 * @returns: a new string #GVariant instance
 *
 * Creates a string #GVariant with the contents of @string.
 *
966 967
 * @string must be valid utf8.
 *
968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
 * Since: 2.24
 **/
GVariant *
g_variant_new_string (const gchar *string)
{
  g_return_val_if_fail (string != NULL, NULL);

  return g_variant_new_from_trusted (G_VARIANT_TYPE_STRING,
                                     string, strlen (string) + 1);
}

/**
 * g_variant_new_object_path:
 * @object_path: a normal C nul-terminated string
 * @returns: a new object path #GVariant instance
 *
 * Creates a DBus object path #GVariant with the contents of @string.
 * @string must be a valid DBus object path.  Use
 * g_variant_is_object_path() if you're not sure.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_new_object_path (const gchar *object_path)
{
  g_return_val_if_fail (g_variant_is_object_path (object_path), NULL);

  return g_variant_new_from_trusted (G_VARIANT_TYPE_OBJECT_PATH,
                                     object_path, strlen (object_path) + 1);
}

/**
 * g_variant_is_object_path:
 * @string: a normal C nul-terminated string
 * @returns: %TRUE if @string is a DBus object path
 *
 * Determines if a given string is a valid DBus object path.  You
 * should ensure that a string is a valid DBus object path before
 * passing it to g_variant_new_object_path().
 *
 * A valid object path starts with '/' followed by zero or more
 * sequences of characters separated by '/' characters.  Each sequence
 * must contain only the characters "[A-Z][a-z][0-9]_".  No sequence
 * (including the one following the final '/' character) may be empty.
 *
 * Since: 2.24
 **/
gboolean
g_variant_is_object_path (const gchar *string)
{
  g_return_val_if_fail (string != NULL, FALSE);

  return g_variant_serialiser_is_object_path (string, strlen (string) + 1);
}

/**
 * g_variant_new_signature:
 * @signature: a normal C nul-terminated string
 * @returns: a new signature #GVariant instance
 *
 * Creates a DBus type signature #GVariant with the contents of
 * @string.  @string must be a valid DBus type signature.  Use
 * g_variant_is_signature() if you're not sure.
 *
 * Since: 2.24
 **/
GVariant *
g_variant_new_signature (const gchar *signature)
{
  g_return_val_if_fail (g_variant_is_signature (signature), NULL);

  return g_variant_new_from_trusted (G_VARIANT_TYPE_SIGNATURE,
                                     signature, strlen (signature) + 1);
}

/**
 * g_variant_is_signature:
 * @string: a normal C nul-terminated string
 * @returns: %TRUE if @string is a DBus type signature
 *
 * Determines if a given string is a valid DBus type signature.  You
1049
 * should ensure that a string is a valid DBus type signature before
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
 * passing it to g_variant_new_signature().
 *
 * DBus type signatures consist of zero or more definite #GVariantType
 * strings in sequence.
 *
 * Since: 2.24
 **/
gboolean
g_variant_is_signature (const gchar *string)
{
  g_return_val_if_fail (string != NULL, FALSE);

  return g_variant_serialiser_is_signature (string, strlen (string) + 1);
}

/**
 * g_variant_get_string:
 * @value: a string #GVariant instance
1068 1069
 * @length: (allow-none) (default NULL): a pointer to a #gsize,
 *          to store the length
1070
 * @returns: the constant string, utf8 encoded
1071 1072 1073
 *
 * Returns the string value of a #GVariant instance with a string
 * type.  This includes the types %G_VARIANT_TYPE_STRING,
1074 1075
 * %G_VARIANT_TYPE_OBJECT_PATH and %G_VARIANT_TYPE_SIGNATURE.
 *
1076 1077
 * The string will always be utf8 encoded.
 *
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
 * If @length is non-%NULL then the length of the string (in bytes) is
 * returned there.  For trusted values, this information is already
 * known.  For untrusted values, a strlen() will be performed.
 *
 * It is an error to call this function with a @value of any type
 * other than those three.
 *
 * The return value remains valid as long as @value exists.
 *
 * Since: 2.24
 **/
const gchar *
g_variant_get_string (GVariant *value,
                      gsize    *length)
{
1093 1094 1095
  gconstpointer data;
  gsize size;

1096 1097 1098 1099 1100
  g_return_val_if_fail (value != NULL, NULL);
  g_return_val_if_fail (
    g_variant_is_of_type (value, G_VARIANT_TYPE_STRING) ||
    g_variant_is_of_type (value, G_VARIANT_TYPE_OBJECT_PATH) ||
    g_variant_is_of_type (value, G_VARIANT_TYPE_SIGNATURE), NULL);
1101 1102 1103

  data = g_variant_get_data (value);
  size = g_variant_get_size (value);
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147

  if (!g_variant_is_trusted (value))
    {
      switch (g_variant_classify (value))
        {
        case G_VARIANT_CLASS_STRING:
          if (g_variant_serialiser_is_string (data, size))
            break;

          data = "";
          size = 1;
          break;

        case G_VARIANT_CLASS_OBJECT_PATH:
          if (g_variant_serialiser_is_object_path (data, size))
            break;

          data = "/";
          size = 2;
          break;

        case G_VARIANT_CLASS_SIGNATURE:
          if (g_variant_serialiser_is_signature (data, size))
            break;

          data = "";
          size = 1;
          break;

        default:
          g_assert_not_reached ();
        }
    }

  if (length)
    *length = size - 1;

  return data;
}

/**
 * g_variant_dup_string:
 * @value: a string #GVariant instance
 * @length: a pointer to a #gsize, to store the length
1148
 * @returns: a newly allocated string, utf8 encoded
1149 1150 1151 1152
 *
 * Similar to g_variant_get_string() except that instead of returning
 * a constant string, the string is duplicated.
 *
1153 1154
 * The string will always be utf8 encoded.
 *
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
 * The return value must be freed using g_free().
 *
 * Since: 2.24
 **/
gchar *
g_variant_dup_string (GVariant *value,
                      gsize    *length)
{
  return g_strdup (g_variant_get_string (value, length));
}

1166
/**
1167 1168 1169
 * g_variant_new_strv:
 * @strv: (array length=length): an array of strings
 * @length: the length of @strv, or -1
1170 1171
 * @returns: a new floating #GVariant instance
 *
1172 1173
 * Constructs an array of strings #GVariant from the given array of
 * strings.
1174
 *
1175
 * If @length is -1 then @strv is %NULL-terminated.
1176
 *
1177
 * Since: 2.24
1178 1179
 **/
GVariant *
1180 1181
g_variant_new_strv (const gchar * const *strv,
                    gssize               length)
1182
{
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
  GVariant **strings;
  gsize i;

  g_return_val_if_fail (length == 0 || strv != NULL, NULL);

  if (length < 0)
    length = g_strv_length ((gchar **) strv);

  strings = g_new (GVariant *, length);
  for (i = 0; i < length; i++)
    strings[i] = g_variant_ref_sink (g_variant_new_string (strv[i]));

  return g_variant_new_from_children (G_VARIANT_TYPE_STRING_ARRAY,
                                      strings, length, TRUE);
}

/**
 * g_variant_get_strv:
 * @value: an array of strings #GVariant
 * @length: (allow-none): the length of the result, or %NULL
 * @returns: (array length=length): an array of constant strings
 *
 * Gets the contents of an array of strings #GVariant.  This call
 * makes a shallow copy; the return result should be released with
 * g_free(), but the individual strings must not be modified.
 *
 * If @length is non-%NULL then the number of elements in the result
 * is stored there.  In any case, the resulting array will be
 * %NULL-terminated.
 *
 * For an empty array, @length will be set to 0 and a pointer to a
 * %NULL pointer will be returned.
 *
 * Since: 2.24
 **/
const gchar **
g_variant_get_strv (GVariant *value,
                    gsize    *length)
{
  const gchar **strv;
  gsize n;
  gsize i;

  TYPE_CHECK (value, G_VARIANT_TYPE_STRING_ARRAY, NULL);

  g_variant_get_data (value);
  n = g_variant_n_children (value);
  strv = g_new (const gchar *, n + 1);

  for (i = 0; i < n; i++)
1233
    {
1234
      GVariant *string;
1235

1236 1237 1238
      string = g_variant_get_child_value (value, i);
      strv[i] = g_variant_get_string (string, NULL);
      g_variant_unref (string);
1239
    }
1240
  strv[i] = NULL;
1241

1242 1243 1244 1245
  if (length)
    *length = n;

  return strv;
1246 1247 1248
}

/**
1249 1250
 * g_variant_dup_strv:
 * @value: an array of strings #GVariant
1251
 * @length: (allow-none): the length of the result, or %NULL
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
 * @returns: (array length=length): an array of strings
 *
 * Gets the contents of an array of strings #GVariant.  This call
 * makes a deep copy; the return result should be released with
 * g_strfreev().
 *
 * If @length is non-%NULL then the number of elements in the result
 * is stored there.  In any case, the resulting array will be
 * %NULL-terminated.
 *
 * For an empty array, @length will be set to 0 and a pointer to a
 * %NULL pointer will be returned.
 *
 * Since: 2.24
 **/
gchar **
g_variant_dup_strv (GVariant *value,
                    gsize    *length)
{
  gchar **strv;
  gsize n;
  gsize i;

  TYPE_CHECK (value, G_VARIANT_TYPE_STRING_ARRAY, NULL);

  n = g_variant_n_children (value);
  strv = g_new (gchar *, n + 1);

  for (i = 0; i < n; i++)
    {
      GVariant *string;

      string = g_variant_get_child_value (value, i);
      strv[i] = g_variant_dup_string (string, NULL);
      g_variant_unref (string);
    }
  strv[i] = NULL;

  if (length)
    *length = n;

  return strv;
}

/**
 * g_variant_new_bytestring:
1298
 * @string: a normal nul-terminated string in no particular encoding
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
 * @returns: a new bytestring #GVariant instance
 *
 * Creates an array-of-bytes #GVariant with the contents of @string.
 * This function is just like g_variant_new_string() except that the
 * string need not be valid utf8.
 *
 * The nul terminator character at the end of the string is stored in
 * the array.
 *
 * Since: 2.26
 **/
GVariant *
g_variant_new_bytestring (const gchar *string)
{
  g_return_val_if_fail (string != NULL, NULL);

  return g_variant_new_from_trusted (G_VARIANT_TYPE_BYTESTRING,
                                     string, strlen (string) + 1);
}

/**
 * g_variant_get_bytestring:
 * @value: an array-of-bytes #GVariant instance
 * @returns: the constant string
 *
 * Returns the string value of a #GVariant instance with an
 * array-of-bytes type.  The string has no particular encoding.
1326
 *
1327 1328 1329
 * If the array does not end with a nul terminator character, the empty
 * string is returned.  For this reason, you can always trust that a
 * non-%NULL nul-terminated string will be returned by this function.
1330
 *
1331 1332 1333
 * If the array contains a nul terminator character somewhere other than
 * the last byte then the returned string is the string, up to the first
 * such nul character.
1334
 *
1335 1336
 * It is an error to call this function with a @value that is not an
 * array of bytes.
1337 1338 1339 1340 1341
 *
 * The return value remains valid as long as @value exists.
 *
 * Since: 2.26
 **/
1342 1343
const gchar *
g_variant_get_bytestring (GVariant *value)
1344
{
1345
  const gchar *string;
1346 1347
  gsize size;

1348
  TYPE_CHECK (value, G_VARIANT_TYPE_BYTESTRING, NULL);
1349

1350 1351
  /* Won't be NULL since this is an array type */
  string = g_variant_get_data (value);
1352 1353
  size = g_variant_get_size (value);

1354 1355
  if (string[size - 1] == '\0')
    return string;
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  else
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    return "";
}

/**
 * g_variant_dup_bytestring:
 * @value: an array-of-bytes #GVariant instance
 * @length: (allow-none) (default NULL): a pointer to a #gsize, to store
 *          the length (not including the nul terminator)
 * @returns: a newly allocated string
 *
 * Similar to g_variant_get_bytestring() except that instead of
 * returning a constant string, the string is duplicated.
 *
 * The return value must be freed using g_free().
 *
 * Since: 2.26
 **/
gchar *
g_variant_dup_bytestring (GVariant *value,
                          gsize    *length)
{
  const gchar *original = g_variant_get_bytestring (value);
  gsize size;

  /* don't crash in case get_bytestring() had an assert failure */
  if (original == NULL)
    return NULL;

  size = strlen (original);

  if (length)
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    *length = size;

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  return g_memdup (original, size + 1);
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}

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/**
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 * g_variant_new_bytestring_array:
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 * @strv: (array length=length): an array of strings
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 * @length: the length of @strv, or -1
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 * @returns: a new floating #GVariant instance
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 *
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 * Constructs an array of bytestring #GVariant from the given array of
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 * strings.
 *
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 * If @length is -1 then @strv is %NULL-terminated.
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 *
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 * Since: 2.26
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 **/
GVariant *
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g_variant_new_bytestring_array (const gchar * const *strv,
                                gssize               length)
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{
  GVariant **strings;
  gsize i;

  g_return_val_if_fail (length == 0 || strv != NULL, NULL);

  if (length < 0)
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    length = g_strv_length ((gchar **) strv);
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  strings = g_new (GVariant *, length);
  for (i = 0; i < length; i++)
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    strings[i] = g_variant_ref_sink (g_variant_new_bytestring (strv[i]));
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  return g_variant_new_from_children (G_VARIANT_TYPE_BYTESTRING_ARRAY,
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                                      strings, length, TRUE);
}

/**
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 * g_variant_get_bytestring_array:
 * @value: an array of array of bytes #GVariant ('aay')
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 * @length: (allow-none): the length of the result, or %NULL
 * @returns: (array length=length): an array of constant strings
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 *
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 * Gets the contents of an array of array of bytes #GVariant.  This call
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 * makes a shallow copy; the return result should be released with
 * g_free(), but the individual strings must not be modified.
 *
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 * If @length is non-%NULL then the number of elements in the result is
 * stored there.  In any case, the resulting array will be
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 * %NULL-terminated.
 *
 * For an empty array, @length will be set to 0 and a pointer to a
 * %NULL pointer will be returned.
 *
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 * Since: 2.26
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 **/
const gchar **
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g_variant_get_bytestring_array (GVariant *value,
                                gsize    *length)
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{
  const gchar **strv;
  gsize n;
  gsize i;

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  TYPE_CHECK (value, G_VARIANT_TYPE_BYTESTRING_ARRAY, NULL);
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  g_variant_get_data (value);
  n = g_variant_n_children (value);
  strv = g_new (const gchar *, n + 1);

  for (i = 0; i < n; i++)
    {
      GVariant *string;

      string = g_variant_get_child_value (value, i);
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      strv[i] = g_variant_get_bytestring (string);
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      g_variant_unref (string);
    }
  strv[i] = NULL;

  if (length)
    *length = n;

  return strv;
}

/**
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 * g_variant_dup_bytestring_array:
 * @value: an array of array of bytes #GVariant ('aay')
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 * @length: (allow-none): the length of the result, or %NULL
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 * @returns: (array length=length): an array of strings
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 *
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 * Gets the contents of an array of array of bytes #GVariant.  This call
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 * makes a deep copy; the return result should be released with
 * g_strfreev().
 *
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 * If @length is non-%NULL then the number of elements in the result is
 * stored there.  In any case, the resulting array will be
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 * %NULL-terminated.
 *
 * For an empty array, @length will be set to 0 and a pointer to a
 * %NULL pointer will be returned.
 *
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 * Since: 2.26
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 **/
gchar **
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g_variant_dup_bytestring_array (GVariant *value,
                                gsize    *length)
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{
  gchar **strv;
  gsize n;
  gsize i;

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  TYPE_CHECK (value, G_VARIANT_TYPE_BYTESTRING_ARRAY, NULL);
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  g_variant_get_data (value);
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  n = g_variant_n_children (value);
  strv = g_new (gchar *, n + 1);

  for (i = 0; i < n; i++)
    {
      GVariant *string;

      string = g_variant_get_child_value (value, i);
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      strv[i] = g_variant_dup_bytestring (string, NULL);
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      g_variant_unref (string);
    }
  strv[i] = NULL;

  if (length)
    *length = n;

  return strv;
}

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/* Type checking and querying {{{1 */
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/**
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 * g_variant_get_type:
 * @value: a #GVariant
 * @returns: a #GVariantType
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 *
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 * Determines the type of @value.
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 *
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 * The return value is valid for the lifetime of @value and must not
 * be freed.
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 *
 * Since: 2.24
 **/
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const GVariantType *
g_variant_get_type (GVariant *value)
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{
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  GVariantTypeInfo *type_info;
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  g_return_val_if_fail (value != NULL, NULL);
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  type_info = g_variant_get_type_info (value);
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  return (GVariantType *) g_variant_type_info_get_type_string (type_info);
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}

/**
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 * g_variant_get_type_string:
 * @value: a #GVariant
 * @returns: the type string for the type of @value
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 *
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 * Returns the type string of @value.  Unlike the result of calling
 * g_variant_type_peek_string(), this string is nul-terminated.  This
 * string belongs to #GVariant and must not be freed.
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 *
 * Since: 2.24
 **/
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const gchar *
g_variant_get_type_string (GVariant *value)
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{
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  GVariantTypeInfo *type_info;
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  g_return_val_if_fail (value != NULL, NULL);
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  type_info = g_variant_get_type_info (value);
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  return g_variant_type_info_get_type_string (type_info);
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}

/**
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 * g_variant_is_of_type:
 * @value: a #GVariant instance
 * @type: a #GVariantType
 * @returns: %TRUE if the type of @value matches @type
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 *
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 * Checks if a value has a type matching the provided type.
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 *
 * Since: 2.24
 **/
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gboolean
g_variant_is_of_type (GVariant           *value,
                      const GVariantType *type)
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{
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  return g_variant_type_is_subtype_of (g_variant_get_type (value), type);
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}

/**
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 * g_variant_is_container:
 * @value: a #GVariant instance
 * @returns: %TRUE if @value is a container
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 *
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 * Checks if @value is a container.
 */
gboolean
g_variant_is_container (GVariant *value)
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{
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  return g_variant_type_is_container (g_variant_get_type (value));
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}

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/**
 * g_variant_classify:
 * @value: a #GVariant
 * @returns: the #GVariantClass of @value
 *
 * Classifies @value according to its top-level type.
 *
 * Since: 2.24
 **/
/**
 * GVariantClass:
 * @G_VARIANT_CLASS_BOOLEAN: The #GVariant is a boolean.
 * @G_VARIANT_CLASS_BYTE: The #GVariant is a byte.
 * @G_VARIANT_CLASS_INT16: The #GVariant is a signed 16 bit integer.
 * @G_VARIANT_CLASS_UINT16: The #GVariant is an unsigned 16 bit integer.
 * @G_VARIANT_CLASS_INT32: The #GVariant is a signed 32 bit integer.
 * @G_VARIANT_CLASS_UINT32: The #GVariant is an unsigned 32 bit integer.
 * @G_VARIANT_CLASS_INT64: The #GVariant is a signed 64 bit integer.
 * @G_VARIANT_CLASS_UINT64: The #GVariant is an unsigned 64 bit integer.
 * @G_VARIANT_CLASS_HANDLE: The #GVariant is a file handle index.
 * @G_VARIANT_CLASS_DOUBLE: The #GVariant is a double precision floating 
 *                          point value.
 * @G_VARIANT_CLASS_STRING: The #GVariant is a normal string.
 * @G_VARIANT_CLASS_OBJECT_PATH: The #GVariant is a DBus object path 
 *                               string.
 * @G_VARIANT_CLASS_SIGNATURE: The #GVariant is a DBus signature string.
 * @G_VARIANT_CLASS_VARIANT: The #GVariant is a variant.
 * @G_VARIANT_CLASS_MAYBE: The #GVariant is a maybe-typed value.
 * @G_VARIANT_CLASS_ARRAY: The #GVariant is an array.
 * @G_VARIANT_CLASS_TUPLE: The #GVariant is a tuple.
 * @G_VARIANT_CLASS_DICT_ENTRY: The #GVariant is a dictionary entry.
 *
 * The range of possible top-level types of #GVariant instances.
 *
 * Since: 2.24
 **/
GVariantClass
g_variant_classify (GVariant *value)
{
  g_return_val_if_fail (value != NULL, 0);

  return *g_variant_get_type_string (value);
}

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/* Pretty printer {{{1 */
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/**
 * g_variant_print_string:
 * @value: a #GVariant
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 * @string: (allow-none) (default NULL): a #GString, or %NULL
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 * @type_annotate: %TRUE if type information should be included in
 *                 the output
 * @returns: a #GString containing the string
 *
 * Behaves as g_variant_print(), but operates on a #GString.
 *
 * If @string is non-%NULL then it is appended to and returned.  Else,
 * a new empty #GString is allocated and it is returned.
 *
 * Since: 2.24
 **/
GString *
g_variant_print_string (GVariant *value,
                        GString  *string,
                        gboolean  type_annotate)
{
  if G_UNLIKELY (string == NULL)
    string = g_string_new (NULL);

  switch (g_variant_classify (value))
    {
    case G_VARIANT_CLASS_MAYBE:
      if (type_annotate)
        g_string_append_printf (string, "@%s ",
                                g_variant_get_type_string (value));

      if (g_variant_n_children (value))
        {
          gchar *printed_child;
          GVariant *element;

          /* Nested maybes:
           *
           * Consider the case of the type "mmi".  In this case we could
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           * write "just just 4", but "4" alone is totally unambiguous,
           * so we try to drop "just" where possible.
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           *
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           * We have to be careful not to always drop "just", though,
           * since "nothing" needs to be distinguishable from "just
           * nothing".  The case where we need to ensure we keep the
           * "just" is actually exactly the case where we have a nested
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           * Nothing.
           *
           * Instead of searching for that nested Nothing, we just print
           * the contained value into a separate string and see if we
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           * end up with "nothing" at the end of it.  If so, we need to
           * add "just" at our level.
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           */
          element = g_variant_get_child_value (value, 0);
          printed_child = g_variant_print (element, FALSE);
          g_variant_unref (element);

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          if (g_str_has_suffix (printed_child, "nothing"))
            g_string_append (string, "just ");
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          g_string_append (string, printed_child);
          g_free (printed_child);
        }
      else
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        g_string_append (string, "nothing");
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      break;

    case G_VARIANT_CLASS_ARRAY:
      /* it's an array so the first character of the type string is 'a'
       *
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       * if the first two characters are 'ay' then it's a bytestring.
       * under certain conditions we print those as strings.
       */
      if (g_variant_get_type_string (value)[1] == 'y')
        {
          const gchar *str;
          gsize size;
          gsize i;

          /* first determine if it is a byte string.
           * that's when there's a single nul character: at the end.
           */
          str = g_variant_get_data (value);
          size = g_variant_get_size (value);

          for (i = 0; i < size; i++)
            if (str[i] == '\0')
              break;

          /* first nul byte is the last byte -> it's a byte string. */
          if (i == size - 1)
            {
              gchar *escaped = g_strescape (str, NULL);

              /* use double quotes only if a ' is in the string */
              if (strchr (str, '\''))
                g_string_append_printf (string, "b\"%s\"", escaped);
              else
                g_string_append_printf (string, "b'%s'", escaped);

              g_free (escaped);
              break;
            }

          else
            /* fall through and handle normally... */;
        }

      /*
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       * if the first two characters are 'a{' then it's an array of
       * dictionary entries (ie: a dictionary) so we print that
       * differently.
       */
      if (g_variant_get_type_string (value)[1] == '{')
        /* dictionary */
        {
          const gchar *comma = "";
          gsize n, i;

          if ((n = g_variant_n_children (value)) == 0)
            {
              if (type_annotate)
                g_string_append_printf (string, "@%s ",
                                        g_variant_get_type_string (value));
              g_string_append (string, "{}");
              break;
            }

          g_string_append_c (string, '{');
          for (i = 0; i < n; i++)
            {
              GVariant *entry, *key, *val;

              g_string_append (string, comma);
              comma = ", ";

              entry = g_variant_get_child_value (value, i);
              key = g_variant_get_child_value (entry, 0);
              val = g_variant_get_child_value (entry, 1);
              g_variant_unref (entry);

              g_variant_print_string (key, string, type_annotate);
              g_variant_unref (key);
              g_string_append (string, ": ");
              g_variant_print_string (val, string, type_annotate);
              g_variant_unref (val);
              type_annotate = FALSE;
            }
          g_string_append_c (string, '}');
        }
      else
        /* normal (non-dictionary) array */
        {
          const gchar *comma = "";
          gsize n, i;

          if ((n = g_variant_n_children (value)) == 0)
            {
              if (type_annotate)
                g_string_append_printf (string, "@%s ",
                                        g_variant_get_type_string (value));
              g_string_append (string, "[]");
              break;
            }

          g_string_append_c (string, '[');
          for (i = 0; i < n; i++)
            {
              GVariant *element;

              g_string_append (string, comma);
              comma = ", ";

              element = g_variant_get_child_value (value, i);

              g_variant_print_string (element, string, type_annotate);
              g_variant_unref (element);
              type_annotate = FALSE;
            }
          g_string_append_c (string, ']');
        }

      break;

    case G_VARIANT_CLASS_TUPLE:
      {
        gsize n, i;

        n = g_variant_n_children (value);

        g_string_append_c (string, '(');
        for (i = 0; i < n; i++)
          {
            GVariant *element;

            element = g_variant_get_child_value (value, i);
            g_variant_print_string (element, string, type_annotate);
            g_string_append (string, ", ");
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            g_variant_unref (element);
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          }

        /* for >1 item:  remove final ", "
         * for 1 item:   remove final " ", but leave the ","
         * for 0 items:  there is only "(", so remove nothing
         */
        g_string_truncate (string, string->len - (n > 0) - (n > 1));
        g_string_append_c (string, ')');
      }
      break;

    case G_VARIANT_CLASS_DICT_ENTRY:
      {
        GVariant *element;

        g_string_append_c (string, '{');

        element = g_variant_get_child_value (value, 0);
        g_variant_print_string (element, string, type_annotate);
        g_variant_unref (element);

        g_string_append (string, ", ");

        element = g_variant_get_child_value (value, 1);
        g_variant_print_string (element, string, type_annotate);
        g_variant_unref (element);

        g_string_append_c (string, '}');
      }
      break;

    case G_VARIANT_CLASS_VARIANT:
      {
        GVariant *child = g_variant_get_variant (value);

        /* Always annotate types in nested variants, because they are
         * (by nature) of variable type.
         */
        g_string_append_c (string, '<');
        g_variant_print_string (child, string, TRUE);
        g_string_append_c (string, '>');

        g_variant_unref (child);
      }
      break;

    case G_VARIANT_CLASS_BOOLEAN:
      if (g_variant_get_boolean (value))
        g_string_append (string, "true");
      else
        g_string_append (string, "false");
      break;

    case G_VARIANT_CLASS_STRING:
      {
        const gchar *str = g_variant_get_string (value, NULL);
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        gunichar quote = strchr (str, '\'') ? '"' : '\'';
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        g_string_append_c (string, quote);
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        while (*str)
          {
            gunichar c = g_utf8_get_char (str);

            if (c == quote || c == '\\')
              g_string_append_c (string, '\\');

            if (g_unichar_isprint (c))
              g_string_append_unichar (string, c);

            else
              {
                g_string_append_c (string, '\\');
                if (c < 0x10000)
                  switch (c)
                    {
                    case '\a':
                      g_string_append_c (string, 'a');
                      break;

                    case '\b':
                      g_string_append_c (string, 'b');
                      break;

                    case '\f':
                      g_string_append_c (string, 'f');
                      break;

                    case '\n':
                      g_string_append_c (string, 'n');
                      break;

                    case '\r':
                      g_string_append_c (string, 'r');
                      break;

                    case '\t':
                      g_string_append_c (string, 't');
                      break;

                    case '\v':
                      g_string_append_c (string, 'v');
                      break;

                    default:
                      g_string_append_printf (string, "u%04x", c);
                      break;
                    }
                 else
                   g_string_append_printf (string, "U%08x", c);
              }

            str = g_utf8_next_char (str);
          }

        g_string_append_c (string, quote);
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      }
      break;

    case G_VARIANT_CLASS_BYTE:
      if (type_annotate)
        g_string_append (string, "byte ");
      g_string_append_printf (string, "0x%02x",
                              g_variant_get_byte (value));
      break;

    case G_VARIANT_CLASS_INT16:
      if (type_annotate)
        g_string_append (string, "int16 ");
      g_string_append_printf (string, "%"G_GINT16_FORMAT,
                              g_variant_get_int16 (value));
      break;

    case G_VARIANT_CLASS_UINT16:
      if (type_annotate)
        g_string_append (string, "uint16 ");
      g_string_append_printf (string, "%"G_GUINT16_FORMAT,
                              g_variant_get_uint16 (value));
      break;

    case G_VARIANT_CLASS_INT32:
      /* Never annotate this type because it is the default for numbers
       * (and this is a *pretty* printer)
       */
      g_string_append_printf (string, "%"G_GINT32_FORMAT,
                              g_variant_get_int32 (value));
      break;

    case G_VARIANT_CLASS_HANDLE:
      if (type_annotate)
        g_string_append (string, "handle ");
      g_string_append_printf (string, "%"G_GINT32_FORMAT,
                              g_variant_get_handle (value));
      break;

    case G_VARIANT_CLASS_UINT32:
      if (type_annotate)
        g_string_append (string, "uint32 ");
      g_string_append_printf (string, "%"G_GUINT32_FORMAT,
                              g_variant_get_uint32 (value));
      break;

    case G_VARIANT_CLASS_INT64:
      if (type_annotate)
        g_string_append (string, "int64 ");
      g_string_append_printf (string, "%"G_GINT64_FORMAT,
                              g_variant_get_int64 (value));
      break;

    case G_VARIANT_CLASS_UINT64:
      if (type_annotate)
        g_string_append (string, "uint64 ");
      g_string_append_printf (string, "%"G_GUINT64_FORMAT,
                              g_variant_get_uint64 (value));
      break;

    case G_VARIANT_CLASS_DOUBLE:
      {
        gchar buffer[100];
        gint i;

        g_ascii_dtostr (buffer, sizeof buffer, g_variant_get_double (value));

        for (i = 0; buffer[i]; i++)
          if (buffer[i] == '.' || buffer[i] == 'e' ||
              buffer[i] == 'n' || buffer[i] == 'N')
            break;

        /* if there is no '.' or 'e' in the float then add one */
        if (buffer[i] == '\0')
          {
            buffer[i++] = '.';
            buffer[i++] = '0';
            buffer[i++] = '\0';
          }

        g_string_append (string, buffer);
      }
      break;

    case G_VARIANT_CLASS_OBJECT_PATH:
      if (type_annotate)
        g_string_append (string, "objectpath ");
2049
      g_string_append_printf (string, "\'%s\'",
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                              g_variant_get_string (value, NULL));
      break;

    case G_VARIANT_CLASS_SIGNATURE:
      if (type_annotate)
        g_string_append (string, "signature ");
2056
      g_string_append_printf (string, "\'%s\'",
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                              g_variant_get_string (value, NULL));
      break;

    default:
      g_assert_not_reached ();
  }

  return string;
}

/**
 * g_variant_print:
 * @value: a #GVariant
 * @type_annotate: %TRUE if type information should be included in
 *                 the output
 * @returns: a newly-allocated string holding the result.
 *
 * Pretty-prints @value in the format understood by g_variant_parse().
 *
 * If @type_annotate is %TRUE, then type information is included in
 * the output.
 */
gchar *
g_variant_print (GVariant *value,
                 gboolean  type_annotate)
{
  return g_string_free (g_variant_print_string (value, NULL, type_annotate),
                        FALSE);
};

2087
/* Hash, Equal, Compare {{{1 */
2088 2089
/**
 * g_variant_hash:
2090
 * @value: (type GVariant): a basic #GVariant value as a #gconstpointer
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 * @returns: a hash value corresponding to @value
 *
 * Generates a hash value for a #GVariant instance.
 *
 * The output of this function is guaranteed to be the same for a given
 * value only per-process.  It may change between different processor
 * architectures or even different versions of GLib.  Do not use this
 * function as a basis for building protocols or file formats.
 *
 * The type of @value is #gconstpointer only to allow use of this
 * function with #GHashTable.  @value must be a #GVariant.
 *
 * Since: 2.24
 **/
guint
g_variant_hash (gconstpointer value_)
{
  GVariant *value = (GVariant *) value_;

  switch (g_variant_classify (value))
    {
    case G_VARIANT_CLASS_STRING:
    case G_VARIANT_CLASS_OBJECT_PATH:
    case G_VARIANT_CLASS_SIGNATURE:
      return g_str_hash (g_variant_get_string (value, NULL));

    case G_VARIANT_CLASS_BOOLEAN:
      /* this is a very odd thing to hash... */
      return g_variant_get_boolean (value);

    case G_VARIANT_CLASS_BYTE:
      return g_variant_get_byte (value);

    case G_VARIANT_CLASS_INT16:
    case G_VARIANT_CLASS_UINT16:
      {
        const guint16 *ptr;

        ptr = g_variant_get_data (value);

        if (ptr)
          return *ptr;
        else
          return 0;
      }

    case G_VARIANT_CLASS_INT32:
    case G_VARIANT_CLASS_UINT32:
    case G_VARIANT_CLASS_HANDLE:
      {
        const guint *ptr;

        ptr = g_variant_get_data (value);

        if (ptr)
          return *ptr;
        else
          return 0;
      }

    case G_VARIANT_CLASS_INT64:
    case G_VARIANT_CLASS_UINT64:
    case G_VARIANT_CLASS_DOUBLE:
      /* need a separate case for these guys because otherwise
       * performance could be quite bad on big endian systems
       */
      {
        const guint *ptr;

        ptr = g_variant_get_data (value);

        if (ptr)
          return ptr[0] + ptr[1];
        else
          return 0;
      }

    default:
      g_return_val_if_fail (!g_variant_is_container (value), 0);
      g_assert_not_reached ();
    }
}

/**
 * g_variant_equal:
2176 2177
 * @one: (type GVariant): a #GVariant instance
 * @two: (type GVariant): a #GVariant instance
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