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glib/glib/garray.c
Christian Hergert 0c7dc75844 garray: add overflow checks before expanding array 
We should bail when we detect that adding a number of items to an array
would cause it to overflow. Since we can't change to using gsize for ABI
reasons we should protect the integrity of the process even if that means
crashing.
2018-07-23 21:05:11 -07:00

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include "garray.h"
#include "gbytes.h"
#include "ghash.h"
#include "gslice.h"
#include "gmem.h"
#include "gtestutils.h"
#include "gthread.h"
#include "gmessages.h"
#include "gqsort.h"
#include "grefcount.h"
/**
* SECTION:arrays
* @title: Arrays
* @short_description: arrays of arbitrary elements which grow
* automatically as elements are added
*
* Arrays are similar to standard C arrays, except that they grow
* automatically as elements are added.
*
* Array elements can be of any size (though all elements of one array
* are the same size), and the array can be automatically cleared to
* '0's and zero-terminated.
*
* To create a new array use g_array_new().
*
* To add elements to an array, use g_array_append_val(),
* g_array_append_vals(), g_array_prepend_val(), and
* g_array_prepend_vals().
*
* To access an element of an array, use g_array_index().
*
* To set the size of an array, use g_array_set_size().
*
* To free an array, use g_array_free().
*
* Here is an example that stores integers in a #GArray:
* |[<!-- language="C" -->
* GArray *garray;
* gint i;
* // We create a new array to store gint values.
* // We don't want it zero-terminated or cleared to 0's.
* garray = g_array_new (FALSE, FALSE, sizeof (gint));
* for (i = 0; i < 10000; i++)
* g_array_append_val (garray, i);
* for (i = 0; i < 10000; i++)
* if (g_array_index (garray, gint, i) != i)
* g_print ("ERROR: got %d instead of %d\n",
* g_array_index (garray, gint, i), i);
* g_array_free (garray, TRUE);
* ]|
*/
#define MIN_ARRAY_SIZE 16
typedef struct _GRealArray GRealArray;
/**
* GArray:
* @data: a pointer to the element data. The data may be moved as
* elements are added to the #GArray.
* @len: the number of elements in the #GArray not including the
* possible terminating zero element.
*
* Contains the public fields of a GArray.
*/
struct _GRealArray
{
guint8 *data;
guint len;
guint alloc;
guint elt_size;
guint zero_terminated : 1;
guint clear : 1;
gatomicrefcount ref_count;
GDestroyNotify clear_func;
};
/**
* g_array_index:
* @a: a #GArray
* @t: the type of the elements
* @i: the index of the element to return
*
* Returns the element of a #GArray at the given index. The return
* value is cast to the given type.
*
* This example gets a pointer to an element in a #GArray:
* |[<!-- language="C" -->
* EDayViewEvent *event;
* // This gets a pointer to the 4th element in the array of
* // EDayViewEvent structs.
* event = &g_array_index (events, EDayViewEvent, 3);
* ]|
*
* Returns: the element of the #GArray at the index given by @i
*/
#define g_array_elt_len(array,i) ((array)->elt_size * (i))
#define g_array_elt_pos(array,i) ((array)->data + g_array_elt_len((array),(i)))
#define g_array_elt_zero(array, pos, len) \
(memset (g_array_elt_pos ((array), pos), 0, g_array_elt_len ((array), len)))
#define g_array_zero_terminate(array) G_STMT_START{ \
if ((array)->zero_terminated) \
g_array_elt_zero ((array), (array)->len, 1); \
}G_STMT_END
static guint g_nearest_pow (guint num) G_GNUC_CONST;
static void g_array_maybe_expand (GRealArray *array,
guint len);
/**
* g_array_new:
* @zero_terminated: %TRUE if the array should have an extra element at
* the end which is set to 0
* @clear_: %TRUE if #GArray elements should be automatically cleared
* to 0 when they are allocated
* @element_size: the size of each element in bytes
*
* Creates a new #GArray with a reference count of 1.
*
* Returns: the new #GArray
*/
GArray*
g_array_new (gboolean zero_terminated,
gboolean clear,
guint elt_size)
{
g_return_val_if_fail (elt_size > 0, NULL);
return g_array_sized_new (zero_terminated, clear, elt_size, 0);
}
/**
* g_array_sized_new:
* @zero_terminated: %TRUE if the array should have an extra element at
* the end with all bits cleared
* @clear_: %TRUE if all bits in the array should be cleared to 0 on
* allocation
* @element_size: size of each element in the array
* @reserved_size: number of elements preallocated
*
* Creates a new #GArray with @reserved_size elements preallocated and
* a reference count of 1. This avoids frequent reallocation, if you
* are going to add many elements to the array. Note however that the
* size of the array is still 0.
*
* Returns: the new #GArray
*/
GArray*
g_array_sized_new (gboolean zero_terminated,
gboolean clear,
guint elt_size,
guint reserved_size)
{
GRealArray *array;
g_return_val_if_fail (elt_size > 0, NULL);
array = g_slice_new (GRealArray);
array->data = NULL;
array->len = 0;
array->alloc = 0;
array->zero_terminated = (zero_terminated ? 1 : 0);
array->clear = (clear ? 1 : 0);
array->elt_size = elt_size;
array->clear_func = NULL;
g_atomic_ref_count_init (&array->ref_count);
if (array->zero_terminated || reserved_size != 0)
{
g_array_maybe_expand (array, reserved_size);
g_array_zero_terminate(array);
}
return (GArray*) array;
}
/**
* g_array_set_clear_func:
* @array: A #GArray
* @clear_func: a function to clear an element of @array
*
* Sets a function to clear an element of @array.
*
* The @clear_func will be called when an element in the array
* data segment is removed and when the array is freed and data
* segment is deallocated as well. @clear_func will be passed a
* pointer to the element to clear, rather than the element itself.
*
* Note that in contrast with other uses of #GDestroyNotify
* functions, @clear_func is expected to clear the contents of
* the array element it is given, but not free the element itself.
*
* Since: 2.32
*/
void
g_array_set_clear_func (GArray *array,
GDestroyNotify clear_func)
{
GRealArray *rarray = (GRealArray *) array;
g_return_if_fail (array != NULL);
rarray->clear_func = clear_func;
}
/**
* g_array_ref:
* @array: A #GArray
*
* Atomically increments the reference count of @array by one.
* This function is thread-safe and may be called from any thread.
*
* Returns: The passed in #GArray
*
* Since: 2.22
*/
GArray *
g_array_ref (GArray *array)
{
GRealArray *rarray = (GRealArray*) array;
g_return_val_if_fail (array, NULL);
g_atomic_ref_count_inc (&rarray->ref_count);
return array;
}
typedef enum
{
FREE_SEGMENT = 1 << 0,
PRESERVE_WRAPPER = 1 << 1
} ArrayFreeFlags;
static gchar *array_free (GRealArray *, ArrayFreeFlags);
/**
* g_array_unref:
* @array: A #GArray
*
* Atomically decrements the reference count of @array by one. If the
* reference count drops to 0, all memory allocated by the array is
* released. This function is thread-safe and may be called from any
* thread.
*
* Since: 2.22
*/
void
g_array_unref (GArray *array)
{
GRealArray *rarray = (GRealArray*) array;
g_return_if_fail (array);
if (g_atomic_ref_count_dec (&rarray->ref_count))
array_free (rarray, FREE_SEGMENT);
}
/**
* g_array_get_element_size:
* @array: A #GArray
*
* Gets the size of the elements in @array.
*
* Returns: Size of each element, in bytes
*
* Since: 2.22
*/
guint
g_array_get_element_size (GArray *array)
{
GRealArray *rarray = (GRealArray*) array;
g_return_val_if_fail (array, 0);
return rarray->elt_size;
}
/**
* g_array_free:
* @array: a #GArray
* @free_segment: if %TRUE the actual element data is freed as well
*
* Frees the memory allocated for the #GArray. If @free_segment is
* %TRUE it frees the memory block holding the elements as well and
* also each element if @array has a @element_free_func set. Pass
* %FALSE if you want to free the #GArray wrapper but preserve the
* underlying array for use elsewhere. If the reference count of @array
* is greater than one, the #GArray wrapper is preserved but the size
* of @array will be set to zero.
*
* If array elements contain dynamically-allocated memory, they should
* be freed separately.
*
* This function is not thread-safe. If using a #GArray from multiple
* threads, use only the atomic g_array_ref() and g_array_unref()
* functions.
*
* Returns: the element data if @free_segment is %FALSE, otherwise
* %NULL. The element data should be freed using g_free().
*/
gchar*
g_array_free (GArray *farray,
gboolean free_segment)
{
GRealArray *array = (GRealArray*) farray;
ArrayFreeFlags flags;
g_return_val_if_fail (array, NULL);
flags = (free_segment ? FREE_SEGMENT : 0);
/* if others are holding a reference, preserve the wrapper but do free/return the data */
if (!g_atomic_ref_count_dec (&array->ref_count))
flags |= PRESERVE_WRAPPER;
return array_free (array, flags);
}
static gchar *
array_free (GRealArray *array,
ArrayFreeFlags flags)
{
gchar *segment;
if (flags & FREE_SEGMENT)
{
if (array->clear_func != NULL)
{
guint i;
for (i = 0; i < array->len; i++)
array->clear_func (g_array_elt_pos (array, i));
}
g_free (array->data);
segment = NULL;
}
else
segment = (gchar*) array->data;
if (flags & PRESERVE_WRAPPER)
{
array->data = NULL;
array->len = 0;
array->alloc = 0;
}
else
{
g_slice_free1 (sizeof (GRealArray), array);
}
return segment;
}
/**
* g_array_append_vals:
* @array: a #GArray
* @data: (not nullable): a pointer to the elements to append to the end of the array
* @len: the number of elements to append
*
* Adds @len elements onto the end of the array.
*
* Returns: the #GArray
*/
/**
* g_array_append_val:
* @a: a #GArray
* @v: the value to append to the #GArray
*
* Adds the value on to the end of the array. The array will grow in
* size automatically if necessary.
*
* g_array_append_val() is a macro which uses a reference to the value
* parameter @v. This means that you cannot use it with literal values
* such as "27". You must use variables.
*
* Returns: the #GArray
*/
GArray*
g_array_append_vals (GArray *farray,
gconstpointer data,
guint len)
{
GRealArray *array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
if (len == 0)
return farray;
g_array_maybe_expand (array, len);
memcpy (g_array_elt_pos (array, array->len), data,
g_array_elt_len (array, len));
array->len += len;
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_prepend_vals:
* @array: a #GArray
* @data: (nullable): a pointer to the elements to prepend to the start of the array
* @len: the number of elements to prepend, which may be zero
*
* Adds @len elements onto the start of the array.
*
* @data may be %NULL if (and only if) @len is zero. If @len is zero, this
* function is a no-op.
*
* This operation is slower than g_array_append_vals() since the
* existing elements in the array have to be moved to make space for
* the new elements.
*
* Returns: the #GArray
*/
/**
* g_array_prepend_val:
* @a: a #GArray
* @v: the value to prepend to the #GArray
*
* Adds the value on to the start of the array. The array will grow in
* size automatically if necessary.
*
* This operation is slower than g_array_append_val() since the
* existing elements in the array have to be moved to make space for
* the new element.
*
* g_array_prepend_val() is a macro which uses a reference to the value
* parameter @v. This means that you cannot use it with literal values
* such as "27". You must use variables.
*
* Returns: the #GArray
*/
GArray*
g_array_prepend_vals (GArray *farray,
gconstpointer data,
guint len)
{
GRealArray *array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
if (len == 0)
return farray;
g_array_maybe_expand (array, len);
memmove (g_array_elt_pos (array, len), g_array_elt_pos (array, 0),
g_array_elt_len (array, array->len));
memcpy (g_array_elt_pos (array, 0), data, g_array_elt_len (array, len));
array->len += len;
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_insert_vals:
* @array: a #GArray
* @index_: the index to place the elements at
* @data: (nullable): a pointer to the elements to insert
* @len: the number of elements to insert
*
* Inserts @len elements into a #GArray at the given index.
*
* If @index_ is greater than the array’s current length, the array is expanded.
* The elements between the old end of the array and the newly inserted elements
* will be initialised to zero if the array was configured to clear elements;
* otherwise their values will be undefined.
*
* @data may be %NULL if (and only if) @len is zero. If @len is zero, this
* function is a no-op.
*
* Returns: the #GArray
*/
/**
* g_array_insert_val:
* @a: a #GArray
* @i: the index to place the element at
* @v: the value to insert into the array
*
* Inserts an element into an array at the given index.
*
* g_array_insert_val() is a macro which uses a reference to the value
* parameter @v. This means that you cannot use it with literal values
* such as "27". You must use variables.
*
* Returns: the #GArray
*/
GArray*
g_array_insert_vals (GArray *farray,
guint index_,
gconstpointer data,
guint len)
{
GRealArray *array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
if (len == 0)
return farray;
/* Is the index off the end of the array, and hence do we need to over-allocate
* and clear some elements? */
if (index_ >= array->len)
{
g_array_maybe_expand (array, index_ - array->len + len);
return g_array_append_vals (g_array_set_size (farray, index_), data, len);
}
g_array_maybe_expand (array, len);
memmove (g_array_elt_pos (array, len + index_),
g_array_elt_pos (array, index_),
g_array_elt_len (array, array->len - index_));
memcpy (g_array_elt_pos (array, index_), data, g_array_elt_len (array, len));
array->len += len;
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_set_size:
* @array: a #GArray
* @length: the new size of the #GArray
*
* Sets the size of the array, expanding it if necessary. If the array
* was created with @clear_ set to %TRUE, the new elements are set to 0.
*
* Returns: the #GArray
*/
GArray*
g_array_set_size (GArray *farray,
guint length)
{
GRealArray *array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
if (length > array->len)
{
g_array_maybe_expand (array, length - array->len);
if (array->clear)
g_array_elt_zero (array, array->len, length - array->len);
}
else if (length < array->len)
g_array_remove_range (farray, length, array->len - length);
array->len = length;
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_remove_index:
* @array: a #GArray
* @index_: the index of the element to remove
*
* Removes the element at the given index from a #GArray. The following
* elements are moved down one place.
*
* Returns: the #GArray
*/
GArray*
g_array_remove_index (GArray *farray,
guint index_)
{
GRealArray* array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
g_return_val_if_fail (index_ < array->len, NULL);
if (array->clear_func != NULL)
array->clear_func (g_array_elt_pos (array, index_));
if (index_ != array->len - 1)
memmove (g_array_elt_pos (array, index_),
g_array_elt_pos (array, index_ + 1),
g_array_elt_len (array, array->len - index_ - 1));
array->len -= 1;
if (G_UNLIKELY (g_mem_gc_friendly))
g_array_elt_zero (array, array->len, 1);
else
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_remove_index_fast:
* @array: a @GArray
* @index_: the index of the element to remove
*
* Removes the element at the given index from a #GArray. The last
* element in the array is used to fill in the space, so this function
* does not preserve the order of the #GArray. But it is faster than
* g_array_remove_index().
*
* Returns: the #GArray
*/
GArray*
g_array_remove_index_fast (GArray *farray,
guint index_)
{
GRealArray* array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
g_return_val_if_fail (index_ < array->len, NULL);
if (array->clear_func != NULL)
array->clear_func (g_array_elt_pos (array, index_));
if (index_ != array->len - 1)
memcpy (g_array_elt_pos (array, index_),
g_array_elt_pos (array, array->len - 1),
g_array_elt_len (array, 1));
array->len -= 1;
if (G_UNLIKELY (g_mem_gc_friendly))
g_array_elt_zero (array, array->len, 1);
else
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_remove_range:
* @array: a @GArray
* @index_: the index of the first element to remove
* @length: the number of elements to remove
*
* Removes the given number of elements starting at the given index
* from a #GArray. The following elements are moved to close the gap.
*
* Returns: the #GArray
*
* Since: 2.4
*/
GArray*
g_array_remove_range (GArray *farray,
guint index_,
guint length)
{
GRealArray *array = (GRealArray*) farray;
g_return_val_if_fail (array, NULL);
g_return_val_if_fail (index_ <= array->len, NULL);
g_return_val_if_fail (index_ + length <= array->len, NULL);
if (array->clear_func != NULL)
{
guint i;
for (i = 0; i < length; i++)
array->clear_func (g_array_elt_pos (array, index_ + i));
}
if (index_ + length != array->len)
memmove (g_array_elt_pos (array, index_),
g_array_elt_pos (array, index_ + length),
(array->len - (index_ + length)) * array->elt_size);
array->len -= length;
if (G_UNLIKELY (g_mem_gc_friendly))
g_array_elt_zero (array, array->len, length);
else
g_array_zero_terminate (array);
return farray;
}
/**
* g_array_sort:
* @array: a #GArray
* @compare_func: comparison function
*
* Sorts a #GArray using @compare_func which should be a qsort()-style
* comparison function (returns less than zero for first arg is less
* than second arg, zero for equal, greater zero if first arg is
* greater than second arg).
*
* This is guaranteed to be a stable sort since version 2.32.
*/
void
g_array_sort (GArray *farray,
GCompareFunc compare_func)
{
GRealArray *array = (GRealArray*) farray;
g_return_if_fail (array != NULL);
/* Don't use qsort as we want a guaranteed stable sort */
g_qsort_with_data (array->data,
array->len,
array->elt_size,
(GCompareDataFunc)compare_func,
NULL);
}
/**
* g_array_sort_with_data:
* @array: a #GArray
* @compare_func: comparison function
* @user_data: data to pass to @compare_func
*
* Like g_array_sort(), but the comparison function receives an extra
* user data argument.
*
* This is guaranteed to be a stable sort since version 2.32.
*
* There used to be a comment here about making the sort stable by
* using the addresses of the elements in the comparison function.
* This did not actually work, so any such code should be removed.
*/
void
g_array_sort_with_data (GArray *farray,
GCompareDataFunc compare_func,
gpointer user_data)
{
GRealArray *array = (GRealArray*) farray;
g_return_if_fail (array != NULL);
g_qsort_with_data (array->data,
array->len,
array->elt_size,
compare_func,
user_data);
}
/* Returns the smallest power of 2 greater than n, or n if
* such power does not fit in a guint
*/
static guint
g_nearest_pow (guint num)
{
guint n = 1;
while (n < num && n > 0)
n <<= 1;
return n ? n : num;
}
static void
g_array_maybe_expand (GRealArray *array,
guint len)
{
guint want_alloc;
/* Detect potential overflow */
if G_UNLIKELY ((G_MAXUINT - array->len) < len)
g_error ("adding %u to array would overflow", len);
want_alloc = g_array_elt_len (array, array->len + len +
array->zero_terminated);
if (want_alloc > array->alloc)
{
want_alloc = g_nearest_pow (want_alloc);
want_alloc = MAX (want_alloc, MIN_ARRAY_SIZE);
array->data = g_realloc (array->data, want_alloc);
if (G_UNLIKELY (g_mem_gc_friendly))
memset (array->data + array->alloc, 0, want_alloc - array->alloc);
array->alloc = want_alloc;
}
}
/**
* SECTION:arrays_pointer
* @title: Pointer Arrays
* @short_description: arrays of pointers to any type of data, which
* grow automatically as new elements are added
*
* Pointer Arrays are similar to Arrays but are used only for storing
* pointers.
*
* If you remove elements from the array, elements at the end of the
* array are moved into the space previously occupied by the removed
* element. This means that you should not rely on the index of particular
* elements remaining the same. You should also be careful when deleting
* elements while iterating over the array.
*
* To create a pointer array, use g_ptr_array_new().
*
* To add elements to a pointer array, use g_ptr_array_add().
*
* To remove elements from a pointer array, use g_ptr_array_remove(),
* g_ptr_array_remove_index() or g_ptr_array_remove_index_fast().
*
* To access an element of a pointer array, use g_ptr_array_index().
*
* To set the size of a pointer array, use g_ptr_array_set_size().
*
* To free a pointer array, use g_ptr_array_free().
*
* An example using a #GPtrArray:
* |[<!-- language="C" -->
* GPtrArray *array;
* gchar *string1 = "one";
* gchar *string2 = "two";
* gchar *string3 = "three";
*
* array = g_ptr_array_new ();
* g_ptr_array_add (array, (gpointer) string1);
* g_ptr_array_add (array, (gpointer) string2);
* g_ptr_array_add (array, (gpointer) string3);
*
* if (g_ptr_array_index (array, 0) != (gpointer) string1)
* g_print ("ERROR: got %p instead of %p\n",
* g_ptr_array_index (array, 0), string1);
*
* g_ptr_array_free (array, TRUE);
* ]|
*/
typedef struct _GRealPtrArray GRealPtrArray;
/**
* GPtrArray:
* @pdata: points to the array of pointers, which may be moved when the
* array grows
* @len: number of pointers in the array
*
* Contains the public fields of a pointer array.
*/
struct _GRealPtrArray
{
gpointer *pdata;
guint len;
guint alloc;
gatomicrefcount ref_count;
GDestroyNotify element_free_func;
};
/**
* g_ptr_array_index:
* @array: a #GPtrArray
* @index_: the index of the pointer to return
*
* Returns the pointer at the given index of the pointer array.
*
* This does not perform bounds checking on the given @index_,
* so you are responsible for checking it against the array length.
*
* Returns: the pointer at the given index
*/
static void g_ptr_array_maybe_expand (GRealPtrArray *array,
gint len);
/**
* g_ptr_array_new:
*
* Creates a new #GPtrArray with a reference count of 1.
*
* Returns: the new #GPtrArray
*/
GPtrArray*
g_ptr_array_new (void)
{
return g_ptr_array_sized_new (0);
}
/**
* g_ptr_array_sized_new:
* @reserved_size: number of pointers preallocated
*
* Creates a new #GPtrArray with @reserved_size pointers preallocated
* and a reference count of 1. This avoids frequent reallocation, if
* you are going to add many pointers to the array. Note however that
* the size of the array is still 0.
*
* Returns: the new #GPtrArray
*/
GPtrArray*
g_ptr_array_sized_new (guint reserved_size)
{
GRealPtrArray *array;
array = g_slice_new (GRealPtrArray);
array->pdata = NULL;
array->len = 0;
array->alloc = 0;
array->element_free_func = NULL;
g_atomic_ref_count_init (&array->ref_count);
if (reserved_size != 0)
g_ptr_array_maybe_expand (array, reserved_size);
return (GPtrArray*) array;
}
/**
* g_ptr_array_new_with_free_func:
* @element_free_func: (nullable): A function to free elements with
* destroy @array or %NULL
*
* Creates a new #GPtrArray with a reference count of 1 and use
* @element_free_func for freeing each element when the array is destroyed
* either via g_ptr_array_unref(), when g_ptr_array_free() is called with
* @free_segment set to %TRUE or when removing elements.
*
* Returns: A new #GPtrArray
*
* Since: 2.22
*/
GPtrArray*
g_ptr_array_new_with_free_func (GDestroyNotify element_free_func)
{
GPtrArray *array;
array = g_ptr_array_new ();
g_ptr_array_set_free_func (array, element_free_func);
return array;
}
/**
* g_ptr_array_new_full:
* @reserved_size: number of pointers preallocated
* @element_free_func: (nullable): A function to free elements with
* destroy @array or %NULL
*
* Creates a new #GPtrArray with @reserved_size pointers preallocated
* and a reference count of 1. This avoids frequent reallocation, if
* you are going to add many pointers to the array. Note however that
* the size of the array is still 0. It also set @element_free_func
* for freeing each element when the array is destroyed either via
* g_ptr_array_unref(), when g_ptr_array_free() is called with
* @free_segment set to %TRUE or when removing elements.
*
* Returns: A new #GPtrArray
*
* Since: 2.30
*/
GPtrArray*
g_ptr_array_new_full (guint reserved_size,
GDestroyNotify element_free_func)
{
GPtrArray *array;
array = g_ptr_array_sized_new (reserved_size);
g_ptr_array_set_free_func (array, element_free_func);
return array;
}
/**
* g_ptr_array_set_free_func:
* @array: A #GPtrArray
* @element_free_func: (nullable): A function to free elements with
* destroy @array or %NULL
*
* Sets a function for freeing each element when @array is destroyed
* either via g_ptr_array_unref(), when g_ptr_array_free() is called
* with @free_segment set to %TRUE or when removing elements.
*
* Since: 2.22
*/
void
g_ptr_array_set_free_func (GPtrArray *array,
GDestroyNotify element_free_func)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
g_return_if_fail (array);
rarray->element_free_func = element_free_func;
}
/**
* g_ptr_array_ref:
* @array: a #GPtrArray
*
* Atomically increments the reference count of @array by one.
* This function is thread-safe and may be called from any thread.
*
* Returns: The passed in #GPtrArray
*
* Since: 2.22
*/
GPtrArray*
g_ptr_array_ref (GPtrArray *array)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
g_return_val_if_fail (array, NULL);
g_atomic_ref_count_inc (&rarray->ref_count);
return array;
}
static gpointer *ptr_array_free (GPtrArray *, ArrayFreeFlags);
/**
* g_ptr_array_unref:
* @array: A #GPtrArray
*
* Atomically decrements the reference count of @array by one. If the
* reference count drops to 0, the effect is the same as calling
* g_ptr_array_free() with @free_segment set to %TRUE. This function
* is thread-safe and may be called from any thread.
*
* Since: 2.22
*/
void
g_ptr_array_unref (GPtrArray *array)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
g_return_if_fail (array);
if (g_atomic_ref_count_dec (&rarray->ref_count))
ptr_array_free (array, FREE_SEGMENT);
}
/**
* g_ptr_array_free:
* @array: a #GPtrArray
* @free_seg: if %TRUE the actual pointer array is freed as well
*
* Frees the memory allocated for the #GPtrArray. If @free_seg is %TRUE
* it frees the memory block holding the elements as well. Pass %FALSE
* if you want to free the #GPtrArray wrapper but preserve the
* underlying array for use elsewhere. If the reference count of @array
* is greater than one, the #GPtrArray wrapper is preserved but the
* size of @array will be set to zero.
*
* If array contents point to dynamically-allocated memory, they should
* be freed separately if @free_seg is %TRUE and no #GDestroyNotify
* function has been set for @array.
*
* This function is not thread-safe. If using a #GPtrArray from multiple
* threads, use only the atomic g_ptr_array_ref() and g_ptr_array_unref()
* functions.
*
* Returns: the pointer array if @free_seg is %FALSE, otherwise %NULL.
* The pointer array should be freed using g_free().
*/
gpointer*
g_ptr_array_free (GPtrArray *array,
gboolean free_segment)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
ArrayFreeFlags flags;
g_return_val_if_fail (rarray, NULL);
flags = (free_segment ? FREE_SEGMENT : 0);
/* if others are holding a reference, preserve the wrapper but
* do free/return the data
*/
if (!g_atomic_ref_count_dec (&rarray->ref_count))
flags |= PRESERVE_WRAPPER;
return ptr_array_free (array, flags);
}
static gpointer *
ptr_array_free (GPtrArray *array,
ArrayFreeFlags flags)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
gpointer *segment;
if (flags & FREE_SEGMENT)
{
/* Data here is stolen and freed manually. It is an
* error to attempt to access the array data (including
* mutating the array bounds) during destruction).
*
* https://bugzilla.gnome.org/show_bug.cgi?id=769064
*/
gpointer *stolen_pdata = g_steal_pointer (&rarray->pdata);
if (rarray->element_free_func != NULL)
{
gsize i;
for (i = 0; i < rarray->len; ++i)
rarray->element_free_func (stolen_pdata[i]);
}
g_free (stolen_pdata);
segment = NULL;
}
else
segment = rarray->pdata;
if (flags & PRESERVE_WRAPPER)
{
rarray->pdata = NULL;
rarray->len = 0;
rarray->alloc = 0;
}
else
{
g_slice_free1 (sizeof (GRealPtrArray), rarray);
}
return segment;
}
static void
g_ptr_array_maybe_expand (GRealPtrArray *array,
gint len)
{
/* Detect potential overflow */
if G_UNLIKELY ((G_MAXUINT - array->len) < len)
g_error ("adding %u to array would overflow", len);
if ((array->len + len) > array->alloc)
{
guint old_alloc = array->alloc;
array->alloc = g_nearest_pow (array->len + len);
array->alloc = MAX (array->alloc, MIN_ARRAY_SIZE);
array->pdata = g_realloc (array->pdata, sizeof (gpointer) * array->alloc);
if (G_UNLIKELY (g_mem_gc_friendly))
for ( ; old_alloc < array->alloc; old_alloc++)
array->pdata [old_alloc] = NULL;
}
}
/**
* g_ptr_array_set_size:
* @array: a #GPtrArray
* @length: the new length of the pointer array
*
* Sets the size of the array. When making the array larger,
* newly-added elements will be set to %NULL. When making it smaller,
* if @array has a non-%NULL #GDestroyNotify function then it will be
* called for the removed elements.
*/
void
g_ptr_array_set_size (GPtrArray *array,
gint length)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
guint length_unsigned;
g_return_if_fail (rarray);
g_return_if_fail (rarray->len == 0 || (rarray->len != 0 && rarray->pdata != NULL));
g_return_if_fail (length >= 0);
length_unsigned = (guint) length;
if (length_unsigned > rarray->len)
{
guint i;
g_ptr_array_maybe_expand (rarray, (length_unsigned - rarray->len));
/* This is not
* memset (array->pdata + array->len, 0,
* sizeof (gpointer) * (length_unsigned - array->len));
* to make it really portable. Remember (void*)NULL needn't be
* bitwise zero. It of course is silly not to use memset (..,0,..).
*/
for (i = rarray->len; i < length_unsigned; i++)
rarray->pdata[i] = NULL;
}
else if (length_unsigned < rarray->len)
g_ptr_array_remove_range (array, length_unsigned, rarray->len - length_unsigned);
rarray->len = length_unsigned;
}
static gpointer
ptr_array_remove_index (GPtrArray *array,
guint index_,
gboolean fast,
gboolean free_element)
{
GRealPtrArray *rarray = (GRealPtrArray *) array;
gpointer result;
g_return_val_if_fail (rarray, NULL);
g_return_val_if_fail (rarray->len == 0 || (rarray->len != 0 && rarray->pdata != NULL), NULL);
g_return_val_if_fail (index_ < rarray->len, NULL);
result = rarray->pdata[index_];
if (rarray->element_free_func != NULL && free_element)
rarray->element_free_func (rarray->pdata[index_]);
if (index_ != rarray->len - 1 && !fast)
memmove (rarray->pdata + index_, rarray->pdata + index_ + 1,
sizeof (gpointer) * (rarray->len - index_ - 1));
else if (index_ != rarray->len - 1)
rarray->pdata[index_] = rarray->pdata[rarray->len - 1];
rarray->len -= 1;
if (G_UNLIKELY (g_mem_gc_friendly))
rarray->pdata[rarray->len] = NULL;
return result;
}
/**
* g_ptr_array_remove_index:
* @array: a #GPtrArray
* @index_: the index of the pointer to remove
*
* Removes the pointer at the given index from the pointer array.
* The following elements are moved down one place. If @array has
* a non-%NULL #GDestroyNotify function it is called for the removed
* element. If so, the return value from this function will potentially point
* to freed memory (depending on the #GDestroyNotify implementation).
*
* Returns: (nullable): the pointer which was removed
*/
gpointer
g_ptr_array_remove_index (GPtrArray *array,
guint index_)
{
return ptr_array_remove_index (array, index_, FALSE, TRUE);
}
/**
* g_ptr_array_remove_index_fast:
* @array: a #GPtrArray
* @index_: the index of the pointer to remove
*
* Removes the pointer at the given index from the pointer array.
* The last element in the array is used to fill in the space, so
* this function does not preserve the order of the array. But it
* is faster than g_ptr_array_remove_index(). If @array has a non-%NULL
* #GDestroyNotify function it is called for the removed element. If so, the
* return value from this function will potentially point to freed memory
* (depending on the #GDestroyNotify implementation).
*
* Returns: (nullable): the pointer which was removed
*/
gpointer
g_ptr_array_remove_index_fast (GPtrArray *array,
guint index_)
{
return ptr_array_remove_index (array, index_, TRUE, TRUE);
}
/**
* g_ptr_array_steal_index:
* @array: a #GPtrArray
* @index_: the index of the pointer to steal
*
* Removes the pointer at the given index from the pointer array.
* The following elements are moved down one place. The #GDestroyNotify for
* @array is *not* called on the removed element; ownership is transferred to
* the caller of this function.
*
* Returns: (transfer full) (nullable): the pointer which was removed
* Since: 2.58
*/
gpointer
g_ptr_array_steal_index (GPtrArray *array,
guint index_)
{
return ptr_array_remove_index (array, index_, FALSE, FALSE);
}
/**
* g_ptr_array_steal_index_fast:
* @array: a #GPtrArray
* @index_: the index of the pointer to steal
*
* Removes the pointer at the given index from the pointer array.
* The last element in the array is used to fill in the space, so
* this function does not preserve the order of the array. But it
* is faster than g_ptr_array_steal_index(). The #GDestroyNotify for @array is
* *not* called on the removed element; ownership is transferred to the caller
* of this function.
*
* Returns: (transfer full) (nullable): the pointer which was removed
* Since: 2.58
*/
gpointer
g_ptr_array_steal_index_fast (GPtrArray *array,
guint index_)
{
return ptr_array_remove_index (array, index_, TRUE, FALSE);
}
/**
* g_ptr_array_remove_range:
* @array: a @GPtrArray
* @index_: the index of the first pointer to remove
* @length: the number of pointers to remove
*
* Removes the given number of pointers starting at the given index
* from a #GPtrArray. The following elements are moved to close the
* gap. If @array has a non-%NULL #GDestroyNotify function it is
* called for the removed elements.
*
* Returns: the @array
*
* Since: 2.4
*/
GPtrArray*
g_ptr_array_remove_range (GPtrArray *array,
guint index_,
guint length)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
guint n;
g_return_val_if_fail (rarray != NULL, NULL);
g_return_val_if_fail (rarray->len == 0 || (rarray->len != 0 && rarray->pdata != NULL), NULL);
g_return_val_if_fail (index_ <= rarray->len, NULL);
g_return_val_if_fail (index_ + length <= rarray->len, NULL);
if (rarray->element_free_func != NULL)
{
for (n = index_; n < index_ + length; n++)
rarray->element_free_func (rarray->pdata[n]);
}
if (index_ + length != rarray->len)
{
memmove (&rarray->pdata[index_],
&rarray->pdata[index_ + length],
(rarray->len - (index_ + length)) * sizeof (gpointer));
}
rarray->len -= length;
if (G_UNLIKELY (g_mem_gc_friendly))
{
guint i;
for (i = 0; i < length; i++)
rarray->pdata[rarray->len + i] = NULL;
}
return array;
}
/**
* g_ptr_array_remove:
* @array: a #GPtrArray
* @data: the pointer to remove
*
* Removes the first occurrence of the given pointer from the pointer
* array. The following elements are moved down one place. If @array
* has a non-%NULL #GDestroyNotify function it is called for the
* removed element.
*
* It returns %TRUE if the pointer was removed, or %FALSE if the
* pointer was not found.
*
* Returns: %TRUE if the pointer is removed, %FALSE if the pointer
* is not found in the array
*/
gboolean
g_ptr_array_remove (GPtrArray *array,
gpointer data)
{
guint i;
g_return_val_if_fail (array, FALSE);
g_return_val_if_fail (array->len == 0 || (array->len != 0 && array->pdata != NULL), FALSE);
for (i = 0; i < array->len; i += 1)
{
if (array->pdata[i] == data)
{
g_ptr_array_remove_index (array, i);
return TRUE;
}
}
return FALSE;
}
/**
* g_ptr_array_remove_fast:
* @array: a #GPtrArray
* @data: the pointer to remove
*
* Removes the first occurrence of the given pointer from the pointer
* array. The last element in the array is used to fill in the space,
* so this function does not preserve the order of the array. But it
* is faster than g_ptr_array_remove(). If @array has a non-%NULL
* #GDestroyNotify function it is called for the removed element.
*
* It returns %TRUE if the pointer was removed, or %FALSE if the
* pointer was not found.
*
* Returns: %TRUE if the pointer was found in the array
*/
gboolean
g_ptr_array_remove_fast (GPtrArray *array,
gpointer data)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
guint i;
g_return_val_if_fail (rarray, FALSE);
g_return_val_if_fail (rarray->len == 0 || (rarray->len != 0 && rarray->pdata != NULL), FALSE);
for (i = 0; i < rarray->len; i += 1)
{
if (rarray->pdata[i] == data)
{
g_ptr_array_remove_index_fast (array, i);
return TRUE;
}
}
return FALSE;
}
/**
* g_ptr_array_add:
* @array: a #GPtrArray
* @data: the pointer to add
*
* Adds a pointer to the end of the pointer array. The array will grow
* in size automatically if necessary.
*/
void
g_ptr_array_add (GPtrArray *array,
gpointer data)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
g_return_if_fail (rarray);
g_return_if_fail (rarray->len == 0 || (rarray->len != 0 && rarray->pdata != NULL));
g_ptr_array_maybe_expand (rarray, 1);
rarray->pdata[rarray->len++] = data;
}
/**
* g_ptr_array_insert:
* @array: a #GPtrArray
* @index_: the index to place the new element at, or -1 to append
* @data: the pointer to add.
*
* Inserts an element into the pointer array at the given index. The
* array will grow in size automatically if necessary.
*
* Since: 2.40
*/
void
g_ptr_array_insert (GPtrArray *array,
gint index_,
gpointer data)
{
GRealPtrArray *rarray = (GRealPtrArray *)array;
g_return_if_fail (rarray);
g_return_if_fail (index_ >= -1);
g_return_if_fail (index_ <= (gint)rarray->len);
g_ptr_array_maybe_expand (rarray, 1);
if (index_ < 0)
index_ = rarray->len;
if (index_ < rarray->len)
memmove (&(rarray->pdata[index_ + 1]),
&(rarray->pdata[index_]),
(rarray->len - index_) * sizeof (gpointer));
rarray->len++;
rarray->pdata[index_] = data;
}
/**
* g_ptr_array_sort:
* @array: a #GPtrArray
* @compare_func: comparison function
*
* Sorts the array, using @compare_func which should be a qsort()-style
* comparison function (returns less than zero for first arg is less
* than second arg, zero for equal, greater than zero if irst arg is
* greater than second arg).
*
* Note that the comparison function for g_ptr_array_sort() doesn't
* take the pointers from the array as arguments, it takes pointers to
* the pointers in the array.
*
* This is guaranteed to be a stable sort since version 2.32.
*/
void
g_ptr_array_sort (GPtrArray *array,
GCompareFunc compare_func)
{
g_return_if_fail (array != NULL);
/* Don't use qsort as we want a guaranteed stable sort */
g_qsort_with_data (array->pdata,
array->len,
sizeof (gpointer),
(GCompareDataFunc)compare_func,
NULL);
}
/**
* g_ptr_array_sort_with_data:
* @array: a #GPtrArray
* @compare_func: comparison function
* @user_data: data to pass to @compare_func
*
* Like g_ptr_array_sort(), but the comparison function has an extra
* user data argument.
*
* Note that the comparison function for g_ptr_array_sort_with_data()
* doesn't take the pointers from the array as arguments, it takes
* pointers to the pointers in the array.
*
* This is guaranteed to be a stable sort since version 2.32.
*/
void
g_ptr_array_sort_with_data (GPtrArray *array,
GCompareDataFunc compare_func,
gpointer user_data)
{
g_return_if_fail (array != NULL);
g_qsort_with_data (array->pdata,
array->len,
sizeof (gpointer),
compare_func,
user_data);
}
/**
* g_ptr_array_foreach:
* @array: a #GPtrArray
* @func: the function to call for each array element
* @user_data: user data to pass to the function
*
* Calls a function for each element of a #GPtrArray. @func must not
* add elements to or remove elements from the array.
*
* Since: 2.4
*/
void
g_ptr_array_foreach (GPtrArray *array,
GFunc func,
gpointer user_data)
{
guint i;
g_return_if_fail (array);
for (i = 0; i < array->len; i++)
(*func) (array->pdata[i], user_data);
}
/**
* g_ptr_array_find: (skip)
* @haystack: pointer array to be searched
* @needle: pointer to look for
* @index_: (optional) (out caller-allocates): return location for the index of
* the element, if found
*
* Checks whether @needle exists in @haystack. If the element is found, %TRUE is
* returned and the element’s index is returned in @index_ (if non-%NULL).
* Otherwise, %FALSE is returned and @index_ is undefined. If @needle exists
* multiple times in @haystack, the index of the first instance is returned.
*
* This does pointer comparisons only. If you want to use more complex equality
* checks, such as string comparisons, use g_ptr_array_find_with_equal_func().
*
* Returns: %TRUE if @needle is one of the elements of @haystack
* Since: 2.54
*/
gboolean
g_ptr_array_find (GPtrArray *haystack,
gconstpointer needle,
guint *index_)
{
return g_ptr_array_find_with_equal_func (haystack, needle, NULL, index_);
}
/**
* g_ptr_array_find_with_equal_func: (skip)
* @haystack: pointer array to be searched
* @needle: pointer to look for
* @equal_func: (nullable): the function to call for each element, which should
* return %TRUE when the desired element is found; or %NULL to use pointer
* equality
* @index_: (optional) (out caller-allocates): return location for the index of
* the element, if found
*
* Checks whether @needle exists in @haystack, using the given @equal_func.
* If the element is found, %TRUE is returned and the element’s index is
* returned in @index_ (if non-%NULL). Otherwise, %FALSE is returned and @index_
* is undefined. If @needle exists multiple times in @haystack, the index of
* the first instance is returned.
*
* @equal_func is called with the element from the array as its first parameter,
* and @needle as its second parameter. If @equal_func is %NULL, pointer
* equality is used.
*
* Returns: %TRUE if @needle is one of the elements of @haystack
* Since: 2.54
*/
gboolean
g_ptr_array_find_with_equal_func (GPtrArray *haystack,
gconstpointer needle,
GEqualFunc equal_func,
guint *index_)
{
guint i;
g_return_val_if_fail (haystack != NULL, FALSE);
if (equal_func == NULL)
equal_func = g_direct_equal;
for (i = 0; i < haystack->len; i++)
{
if (equal_func (g_ptr_array_index (haystack, i), needle))
{
if (index_ != NULL)
*index_ = i;
return TRUE;
}
}
return FALSE;
}
/**
* SECTION:arrays_byte
* @title: Byte Arrays
* @short_description: arrays of bytes
*
* #GByteArray is a mutable array of bytes based on #GArray, to provide arrays
* of bytes which grow automatically as elements are added.
*
* To create a new #GByteArray use g_byte_array_new(). To add elements to a
* #GByteArray, use g_byte_array_append(), and g_byte_array_prepend().
*
* To set the size of a #GByteArray, use g_byte_array_set_size().
*
* To free a #GByteArray, use g_byte_array_free().
*
* An example for using a #GByteArray:
* |[<!-- language="C" -->
* GByteArray *gbarray;
* gint i;
*
* gbarray = g_byte_array_new ();
* for (i = 0; i < 10000; i++)
* g_byte_array_append (gbarray, (guint8*) "abcd", 4);
*
* for (i = 0; i < 10000; i++)
* {
* g_assert (gbarray->data[4*i] == 'a');
* g_assert (gbarray->data[4*i+1] == 'b');
* g_assert (gbarray->data[4*i+2] == 'c');
* g_assert (gbarray->data[4*i+3] == 'd');
* }
*
* g_byte_array_free (gbarray, TRUE);
* ]|
*
* See #GBytes if you are interested in an immutable object representing a
* sequence of bytes.
*/
/**
* GByteArray:
* @data: a pointer to the element data. The data may be moved as
* elements are added to the #GByteArray
* @len: the number of elements in the #GByteArray
*
* Contains the public fields of a GByteArray.
*/
/**
* g_byte_array_new:
*
* Creates a new #GByteArray with a reference count of 1.
*
* Returns: (transfer full): the new #GByteArray
*/
GByteArray*
g_byte_array_new (void)
{
return (GByteArray *)g_array_sized_new (FALSE, FALSE, 1, 0);
}
/**
* g_byte_array_new_take:
* @data: (transfer full) (array length=len): byte data for the array
* @len: length of @data
*
* Create byte array containing the data. The data will be owned by the array
* and will be freed with g_free(), i.e. it could be allocated using g_strdup().
*
* Since: 2.32
*
* Returns: (transfer full): a new #GByteArray
*/
GByteArray*
g_byte_array_new_take (guint8 *data,
gsize len)
{
GByteArray *array;
GRealArray *real;
array = g_byte_array_new ();
real = (GRealArray *)array;
g_assert (real->data == NULL);
g_assert (real->len == 0);
real->data = data;
real->len = len;
real->alloc = len;
return array;
}
/**
* g_byte_array_sized_new:
* @reserved_size: number of bytes preallocated
*
* Creates a new #GByteArray with @reserved_size bytes preallocated.
* This avoids frequent reallocation, if you are going to add many
* bytes to the array. Note however that the size of the array is still
* 0.
*
* Returns: the new #GByteArray
*/
GByteArray*
g_byte_array_sized_new (guint reserved_size)
{
return (GByteArray *)g_array_sized_new (FALSE, FALSE, 1, reserved_size);
}
/**
* g_byte_array_free:
* @array: a #GByteArray
* @free_segment: if %TRUE the actual byte data is freed as well
*
* Frees the memory allocated by the #GByteArray. If @free_segment is
* %TRUE it frees the actual byte data. If the reference count of
* @array is greater than one, the #GByteArray wrapper is preserved but
* the size of @array will be set to zero.
*
* Returns: the element data if @free_segment is %FALSE, otherwise
* %NULL. The element data should be freed using g_free().
*/
guint8*
g_byte_array_free (GByteArray *array,
gboolean free_segment)
{
return (guint8 *)g_array_free ((GArray *)array, free_segment);
}
/**
* g_byte_array_free_to_bytes:
* @array: (transfer full): a #GByteArray
*
* Transfers the data from the #GByteArray into a new immutable #GBytes.
*
* The #GByteArray is freed unless the reference count of @array is greater
* than one, the #GByteArray wrapper is preserved but the size of @array
* will be set to zero.
*
* This is identical to using g_bytes_new_take() and g_byte_array_free()
* together.
*
* Since: 2.32
*
* Returns: (transfer full): a new immutable #GBytes representing same
* byte data that was in the array
*/
GBytes*
g_byte_array_free_to_bytes (GByteArray *array)
{
gsize length;
g_return_val_if_fail (array != NULL, NULL);
length = array->len;
return g_bytes_new_take (g_byte_array_free (array, FALSE), length);
}
/**
* g_byte_array_ref:
* @array: A #GByteArray
*
* Atomically increments the reference count of @array by one.
* This function is thread-safe and may be called from any thread.
*
* Returns: The passed in #GByteArray
*
* Since: 2.22
*/
GByteArray*
g_byte_array_ref (GByteArray *array)
{
return (GByteArray *)g_array_ref ((GArray *)array);
}
/**
* g_byte_array_unref:
* @array: A #GByteArray
*
* Atomically decrements the reference count of @array by one. If the
* reference count drops to 0, all memory allocated by the array is
* released. This function is thread-safe and may be called from any
* thread.
*
* Since: 2.22
*/
void
g_byte_array_unref (GByteArray *array)
{
g_array_unref ((GArray *)array);
}
/**
* g_byte_array_append:
* @array: a #GByteArray
* @data: the byte data to be added
* @len: the number of bytes to add
*
* Adds the given bytes to the end of the #GByteArray.
* The array will grow in size automatically if necessary.
*
* Returns: the #GByteArray
*/
GByteArray*
g_byte_array_append (GByteArray *array,
const guint8 *data,
guint len)
{
g_array_append_vals ((GArray *)array, (guint8 *)data, len);
return array;
}
/**
* g_byte_array_prepend:
* @array: a #GByteArray
* @data: the byte data to be added
* @len: the number of bytes to add
*
* Adds the given data to the start of the #GByteArray.
* The array will grow in size automatically if necessary.
*
* Returns: the #GByteArray
*/
GByteArray*
g_byte_array_prepend (GByteArray *array,
const guint8 *data,
guint len)
{
g_array_prepend_vals ((GArray *)array, (guint8 *)data, len);
return array;
}
/**
* g_byte_array_set_size:
* @array: a #GByteArray
* @length: the new size of the #GByteArray
*
* Sets the size of the #GByteArray, expanding it if necessary.
*
* Returns: the #GByteArray
*/
GByteArray*
g_byte_array_set_size (GByteArray *array,
guint length)
{
g_array_set_size ((GArray *)array, length);
return array;
}
/**
* g_byte_array_remove_index:
* @array: a #GByteArray
* @index_: the index of the byte to remove
*
* Removes the byte at the given index from a #GByteArray.
* The following bytes are moved down one place.
*
* Returns: the #GByteArray
**/
GByteArray*
g_byte_array_remove_index (GByteArray *array,
guint index_)
{
g_array_remove_index ((GArray *)array, index_);
return array;
}
/**
* g_byte_array_remove_index_fast:
* @array: a #GByteArray
* @index_: the index of the byte to remove
*
* Removes the byte at the given index from a #GByteArray. The last
* element in the array is used to fill in the space, so this function
* does not preserve the order of the #GByteArray. But it is faster
* than g_byte_array_remove_index().
*
* Returns: the #GByteArray
*/
GByteArray*
g_byte_array_remove_index_fast (GByteArray *array,
guint index_)
{
g_array_remove_index_fast ((GArray *)array, index_);
return array;
}
/**
* g_byte_array_remove_range:
* @array: a @GByteArray
* @index_: the index of the first byte to remove
* @length: the number of bytes to remove
*
* Removes the given number of bytes starting at the given index from a
* #GByteArray. The following elements are moved to close the gap.
*
* Returns: the #GByteArray
*
* Since: 2.4
*/
GByteArray*
g_byte_array_remove_range (GByteArray *array,
guint index_,
guint length)
{
g_return_val_if_fail (array, NULL);
g_return_val_if_fail (index_ <= array->len, NULL);
g_return_val_if_fail (index_ + length <= array->len, NULL);
return (GByteArray *)g_array_remove_range ((GArray *)array, index_, length);
}
/**
* g_byte_array_sort:
* @array: a #GByteArray
* @compare_func: comparison function
*
* Sorts a byte array, using @compare_func which should be a
* qsort()-style comparison function (returns less than zero for first
* arg is less than second arg, zero for equal, greater than zero if
* first arg is greater than second arg).
*
* If two array elements compare equal, their order in the sorted array
* is undefined. If you want equal elements to keep their order (i.e.
* you want a stable sort) you can write a comparison function that,
* if two elements would otherwise compare equal, compares them by
* their addresses.
*/
void
g_byte_array_sort (GByteArray *array,
GCompareFunc compare_func)
{
g_array_sort ((GArray *)array, compare_func);
}
/**
* g_byte_array_sort_with_data:
* @array: a #GByteArray
* @compare_func: comparison function
* @user_data: data to pass to @compare_func
*
* Like g_byte_array_sort(), but the comparison function takes an extra
* user data argument.
*/
void
g_byte_array_sort_with_data (GByteArray *array,
GCompareDataFunc compare_func,
gpointer user_data)
{
g_array_sort_with_data ((GArray *)array, compare_func, user_data);
}
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