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glib/gio/gmemoryoutputstream.c
Alexander Larsson 2c362b7f9e Rename all struct members named: read, write, close, truncate, or mount to 
2007-12-05  Alexander Larsson  <alexl@redhat.com>

        * gbufferedinputstream.c:
        * gbufferedoutputstream.c:
        * gdrive.[ch]:
        * gfile.[ch]:
        * gfileenumerator.[ch]:
        * gfileinputstream.c:
        * gfileoutputstream.[ch]:
        * gfilterinputstream.c:
        * gfilteroutputstream.c:
        * ginputstream.[ch]:
        * glocalfile.c:
        * glocalfileenumerator.c:
        * glocalfileinputstream.c:
        * glocalfileoutputstream.c:
        * gmemoryinputstream.c:
        * gmemoryoutputstream.c:
        * goutputstream.[ch]:
        * gseekable.[ch]:
        * gunixdrive.c:
        * gunixinputstream.c:
        * gunixoutputstream.c:
	Rename all struct members named:
	read, write, close, truncate, or mount
	to foo_fn, as these are reserved names
	and could be defined as macros in libc.
	(#501645)


svn path=/trunk/; revision=6048
2007-12-05 10:38:03 +00:00

683 lines
21 KiB
C
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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Christian Kellner <gicmo@gnome.org>
*/
#include <config.h>
#include "gmemoryoutputstream.h"
#include "goutputstream.h"
#include "gseekable.h"
#include "gsimpleasyncresult.h"
#include "string.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gmemoryoutputstream
* @short_description: Streaming output operations on memory chunks
* @see_also: #GMemoryInputStream
*
* #GMemoryOutputStream is a class for using arbitrary
* memory chunks as output for GIO streaming output operations.
*
*/
struct _GMemoryOutputStreamPrivate {
GByteArray *data;
goffset pos;
guint max_size;
guint free_data : 1;
};
enum {
PROP_0,
PROP_DATA,
PROP_FREE_ARRAY,
PROP_SIZE_LIMIT
};
static void g_memory_output_stream_finalize (GObject *object);
static void g_memory_output_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_memory_output_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static gssize g_memory_output_stream_write (GOutputStream *stream,
const void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static gboolean g_memory_output_stream_close (GOutputStream *stream,
GCancellable *cancellable,
GError **error);
static void g_memory_output_stream_write_async (GOutputStream *stream,
const void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gssize g_memory_output_stream_write_finish (GOutputStream *stream,
GAsyncResult *result,
GError **error);
static void g_memory_output_stream_close_async (GOutputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gboolean g_memory_output_stream_close_finish (GOutputStream *stream,
GAsyncResult *result,
GError **error);
static void g_memory_output_stream_seekable_iface_init (GSeekableIface *iface);
static goffset g_memory_output_stream_tell (GSeekable *seekable);
static gboolean g_memory_output_stream_can_seek (GSeekable *seekable);
static gboolean g_memory_output_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error);
static gboolean g_memory_output_stream_can_truncate (GSeekable *seekable);
static gboolean g_memory_output_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error);
G_DEFINE_TYPE_WITH_CODE (GMemoryOutputStream, g_memory_output_stream, G_TYPE_OUTPUT_STREAM,
G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
g_memory_output_stream_seekable_iface_init))
static void
g_memory_output_stream_class_init (GMemoryOutputStreamClass *klass)
{
GOutputStreamClass *ostream_class;
GObjectClass *gobject_class;
g_type_class_add_private (klass, sizeof (GMemoryOutputStreamPrivate));
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_memory_output_stream_finalize;
gobject_class->get_property = g_memory_output_stream_get_property;
gobject_class->set_property = g_memory_output_stream_set_property;
ostream_class = G_OUTPUT_STREAM_CLASS (klass);
ostream_class->write_fn = g_memory_output_stream_write;
ostream_class->close_fn = g_memory_output_stream_close;
ostream_class->write_async = g_memory_output_stream_write_async;
ostream_class->write_finish = g_memory_output_stream_write_finish;
ostream_class->close_async = g_memory_output_stream_close_async;
ostream_class->close_finish = g_memory_output_stream_close_finish;
g_object_class_install_property (gobject_class,
PROP_DATA,
g_param_spec_pointer ("data",
P_("Data byte array"),
P_("The byte array used as internal storage."),
G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
g_object_class_install_property (gobject_class,
PROP_FREE_ARRAY,
g_param_spec_boolean ("free-array",
P_("Free array data"),
P_("Wether or not the interal array should be free on close."),
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
g_object_class_install_property (gobject_class,
PROP_SIZE_LIMIT,
g_param_spec_uint ("size-limit",
P_("Limit"),
P_("Maximum amount of bytes that can be written to the stream."),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
}
static void
g_memory_output_stream_finalize (GObject *object)
{
GMemoryOutputStream *stream;
stream = G_MEMORY_OUTPUT_STREAM (object);
if (stream->priv->free_data)
g_byte_array_free (stream->priv->data, TRUE);
if (G_OBJECT_CLASS (g_memory_output_stream_parent_class)->finalize)
(*G_OBJECT_CLASS (g_memory_output_stream_parent_class)->finalize) (object);
}
static void
g_memory_output_stream_seekable_iface_init (GSeekableIface *iface)
{
iface->tell = g_memory_output_stream_tell;
iface->can_seek = g_memory_output_stream_can_seek;
iface->seek = g_memory_output_stream_seek;
iface->can_truncate = g_memory_output_stream_can_truncate;
iface->truncate_fn = g_memory_output_stream_truncate;
}
static void
g_memory_output_stream_init (GMemoryOutputStream *stream)
{
GMemoryOutputStreamPrivate *priv;
stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
G_TYPE_MEMORY_OUTPUT_STREAM,
GMemoryOutputStreamPrivate);
priv = stream->priv;
priv->data = NULL;
}
/**
* g_memory_output_stream_new:
* @data: a #GByteArray.
*
* Creates a new #GMemoryOutputStream. If @data is non-%NULL it will use
* that for its internal storage otherwise it will create a new #GByteArray.
* In both cases the internal #GByteArray can later be accessed through the
* "data" property.
*
* Note: The new stream will not take ownership of the supplied
* @data so you have to free it yourself after use or explicitly
* ask for it be freed on close by setting the "free-array"
* property to $TRUE.
*
* Return value: A newly created #GMemoryOutputStream object.
**/
GOutputStream *
g_memory_output_stream_new (GByteArray *data)
{
GOutputStream *stream;
if (data == NULL)
stream = g_object_new (G_TYPE_MEMORY_OUTPUT_STREAM, NULL);
else
stream = g_object_new (G_TYPE_MEMORY_OUTPUT_STREAM,
"data", data,
NULL);
return stream;
}
/**
* g_memory_output_stream_set_free_data:
* @ostream:
* @free_data:
*
**/
void
g_memory_output_stream_set_free_data (GMemoryOutputStream *ostream,
gboolean free_data)
{
GMemoryOutputStreamPrivate *priv;
g_return_if_fail (G_IS_MEMORY_OUTPUT_STREAM (ostream));
priv = ostream->priv;
priv->free_data = free_data;
}
/**
* g_memory_output_stream_set_max_size:
* @ostream:
* @max_size:
*
**/
void
g_memory_output_stream_set_max_size (GMemoryOutputStream *ostream,
guint max_size)
{
GMemoryOutputStreamPrivate *priv;
g_return_if_fail (G_IS_MEMORY_OUTPUT_STREAM (ostream));
priv = ostream->priv;
priv->max_size = max_size;
if (priv->max_size > 0 &&
priv->max_size < priv->data->len)
{
g_byte_array_set_size (priv->data, priv->max_size);
if (priv->pos > priv->max_size)
priv->pos = priv->max_size;
}
g_object_notify (G_OBJECT (ostream), "size-limit");
}
static void
g_memory_output_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GMemoryOutputStream *ostream;
GMemoryOutputStreamPrivate *priv;
GByteArray *data;
guint max_size;
ostream = G_MEMORY_OUTPUT_STREAM (object);
priv = ostream->priv;
switch (prop_id)
{
case PROP_DATA:
if (priv->data && priv->free_data)
g_byte_array_free (priv->data, TRUE);
data = g_value_get_pointer (value);
if (data == NULL)
{
data = g_byte_array_new ();
priv->free_data = TRUE;
}
else
priv->free_data = FALSE;
priv->data = data;
priv->pos = 0;
g_object_notify (G_OBJECT (ostream), "data");
break;
case PROP_FREE_ARRAY:
priv->free_data = g_value_get_boolean (value);
break;
case PROP_SIZE_LIMIT:
max_size = g_value_get_uint (value);
g_memory_output_stream_set_max_size (ostream, max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_memory_output_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GMemoryOutputStream *ostream;
GMemoryOutputStreamPrivate *priv;
ostream = G_MEMORY_OUTPUT_STREAM (object);
priv = ostream->priv;
switch (prop_id)
{
case PROP_DATA:
g_value_set_pointer (value, priv->data);
break;
case PROP_FREE_ARRAY:
g_value_set_boolean (value, priv->free_data);
break;
case PROP_SIZE_LIMIT:
g_value_set_uint (value, priv->max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* g_memory_output_stream_get_data:
* @ostream:
*
* Returns: #GByteArray of the stream's data.
**/
GByteArray *
g_memory_output_stream_get_data (GMemoryOutputStream *ostream)
{
g_return_val_if_fail (G_IS_MEMORY_OUTPUT_STREAM (ostream), NULL);
return ostream->priv->data;
}
static gboolean
array_check_boundary (GMemoryOutputStream *stream,
goffset size,
GError **error)
{
GMemoryOutputStreamPrivate *priv;
priv = stream->priv;
if (!priv->max_size)
return TRUE;
if (priv->max_size < size || size > G_MAXUINT)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Reached maximum data array limit");
return FALSE;
}
return TRUE;
}
static gssize
array_resize (GMemoryOutputStream *stream,
goffset size,
GError **error)
{
GMemoryOutputStreamPrivate *priv;
guint old_len;
priv = stream->priv;
if (! array_check_boundary (stream, size, error))
return -1;
if (priv->data->len == size)
return priv->data->len - priv->pos;
old_len = priv->data->len;
g_byte_array_set_size (priv->data, size);
if (size > old_len && priv->pos > old_len)
memset (priv->data->data + priv->pos, 0, size - old_len);
return priv->data->len - priv->pos;
}
static gssize
g_memory_output_stream_write (GOutputStream *stream,
const void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
GMemoryOutputStream *ostream;
GMemoryOutputStreamPrivate *priv;
gsize new_size;
gssize n;
guint8 *dest;
ostream = G_MEMORY_OUTPUT_STREAM (stream);
priv = ostream->priv;
/* count < 0 is ensured by GOutputStream */
n = MIN (count, priv->data->len - priv->pos);
if (n < 1)
{
new_size = priv->pos + count;
if (priv->max_size > 0)
new_size = MIN (new_size, priv->max_size);
n = array_resize (ostream, new_size, error);
if (n == 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Reached maximum data array limit");
return -1;
}
else if (n < 0)
return -1;
}
dest = priv->data->data + priv->pos;
memcpy (dest, buffer, n);
priv->pos += n;
return n;
}
static gboolean
g_memory_output_stream_close (GOutputStream *stream,
GCancellable *cancellable,
GError **error)
{
GMemoryOutputStream *ostream;
GMemoryOutputStreamPrivate *priv;
ostream = G_MEMORY_OUTPUT_STREAM (stream);
priv = ostream->priv;
return TRUE;
}
static void
g_memory_output_stream_write_async (GOutputStream *stream,
const void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data)
{
GSimpleAsyncResult *simple;
gssize nwritten;
nwritten = g_memory_output_stream_write (stream,
buffer,
count,
cancellable,
NULL);
simple = g_simple_async_result_new (G_OBJECT (stream),
callback,
data,
g_memory_output_stream_write_async);
g_simple_async_result_set_op_res_gssize (simple, nwritten);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
static gssize
g_memory_output_stream_write_finish (GOutputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
gssize nwritten;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_assert (g_simple_async_result_get_source_tag (simple) ==
g_memory_output_stream_write_async);
nwritten = g_simple_async_result_get_op_res_gssize (simple);
return nwritten;
}
static void
g_memory_output_stream_close_async (GOutputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data)
{
GSimpleAsyncResult *simple;
simple = g_simple_async_result_new (G_OBJECT (stream),
callback,
data,
g_memory_output_stream_close_async);
/* will always return TRUE */
g_memory_output_stream_close (stream, cancellable, NULL);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
static gboolean
g_memory_output_stream_close_finish (GOutputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_assert (g_simple_async_result_get_source_tag (simple) ==
g_memory_output_stream_close_async);
return TRUE;
}
static goffset
g_memory_output_stream_tell (GSeekable *seekable)
{
GMemoryOutputStream *stream;
GMemoryOutputStreamPrivate *priv;
stream = G_MEMORY_OUTPUT_STREAM (seekable);
priv = stream->priv;
return priv->pos;
}
static gboolean
g_memory_output_stream_can_seek (GSeekable *seekable)
{
return TRUE;
}
static gboolean
g_memory_output_stream_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GMemoryOutputStream *stream;
GMemoryOutputStreamPrivate *priv;
goffset absolute;
stream = G_MEMORY_OUTPUT_STREAM (seekable);
priv = stream->priv;
switch (type)
{
case G_SEEK_CUR:
absolute = priv->pos + offset;
break;
case G_SEEK_SET:
absolute = offset;
break;
case G_SEEK_END:
absolute = priv->data->len + offset;
break;
default:
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Invalid GSeekType supplied");
return FALSE;
}
if (absolute < 0)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
"Invalid seek request");
return FALSE;
}
if (!array_check_boundary (stream, absolute, error))
return FALSE;
priv->pos = absolute;
return TRUE;
}
static gboolean
g_memory_output_stream_can_truncate (GSeekable *seekable)
{
return TRUE;
}
static gboolean
g_memory_output_stream_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error)
{
GMemoryOutputStream *ostream;
GMemoryOutputStreamPrivate *priv;
ostream = G_MEMORY_OUTPUT_STREAM (seekable);
priv = ostream->priv;
if (array_resize (ostream, offset, error) < 0)
return FALSE;
return TRUE;
}
#define __G_MEMORY_OUTPUT_STREAM_C__
#include "gioaliasdef.c"
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