mirror of https://gitee.com/openkylin/glib2.0.git
594 lines
16 KiB
C
594 lines
16 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include <string.h>
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#include "gdataoutputstream.h"
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#include "gseekable.h"
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#include "gioenumtypes.h"
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#include "gioerror.h"
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#include "glibintl.h"
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/**
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* GDataOutputStream:
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*
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* Data output stream implements [class@Gio.OutputStream] and includes functions
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* for writing data directly to an output stream.
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*/
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struct _GDataOutputStreamPrivate {
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GDataStreamByteOrder byte_order;
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};
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enum {
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PROP_0,
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PROP_BYTE_ORDER
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};
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static void g_data_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void g_data_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void g_data_output_stream_seekable_iface_init (GSeekableIface *iface);
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static goffset g_data_output_stream_tell (GSeekable *seekable);
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static gboolean g_data_output_stream_can_seek (GSeekable *seekable);
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static gboolean g_data_output_stream_seek (GSeekable *seekable,
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goffset offset,
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GSeekType type,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_data_output_stream_can_truncate (GSeekable *seekable);
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static gboolean g_data_output_stream_truncate (GSeekable *seekable,
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goffset offset,
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GCancellable *cancellable,
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GError **error);
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G_DEFINE_TYPE_WITH_CODE (GDataOutputStream,
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g_data_output_stream,
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G_TYPE_FILTER_OUTPUT_STREAM,
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G_ADD_PRIVATE (GDataOutputStream)
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G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
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g_data_output_stream_seekable_iface_init))
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static void
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g_data_output_stream_class_init (GDataOutputStreamClass *klass)
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{
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GObjectClass *object_class;
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = g_data_output_stream_get_property;
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object_class->set_property = g_data_output_stream_set_property;
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/**
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* GDataOutputStream:byte-order:
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*
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* Determines the byte ordering that is used when writing
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* multi-byte entities (such as integers) to the stream.
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*/
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g_object_class_install_property (object_class,
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PROP_BYTE_ORDER,
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g_param_spec_enum ("byte-order", NULL, NULL,
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G_TYPE_DATA_STREAM_BYTE_ORDER,
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G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN,
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G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB));
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}
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static void
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g_data_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GDataOutputStream *dstream;
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dstream = G_DATA_OUTPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_BYTE_ORDER:
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g_data_output_stream_set_byte_order (dstream, g_value_get_enum (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_data_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GDataOutputStreamPrivate *priv;
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GDataOutputStream *dstream;
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dstream = G_DATA_OUTPUT_STREAM (object);
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priv = dstream->priv;
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switch (prop_id)
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{
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case PROP_BYTE_ORDER:
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g_value_set_enum (value, priv->byte_order);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_data_output_stream_init (GDataOutputStream *stream)
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{
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stream->priv = g_data_output_stream_get_instance_private (stream);
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stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
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}
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static void
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g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
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{
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iface->tell = g_data_output_stream_tell;
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iface->can_seek = g_data_output_stream_can_seek;
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iface->seek = g_data_output_stream_seek;
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iface->can_truncate = g_data_output_stream_can_truncate;
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iface->truncate_fn = g_data_output_stream_truncate;
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}
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/**
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* g_data_output_stream_new:
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* @base_stream: a #GOutputStream.
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*
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* Creates a new data output stream for @base_stream.
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*
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* Returns: #GDataOutputStream.
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**/
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GDataOutputStream *
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g_data_output_stream_new (GOutputStream *base_stream)
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{
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GDataOutputStream *stream;
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g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
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stream = g_object_new (G_TYPE_DATA_OUTPUT_STREAM,
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"base-stream", base_stream,
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NULL);
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return stream;
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}
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/**
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* g_data_output_stream_set_byte_order:
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* @stream: a #GDataOutputStream.
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* @order: a %GDataStreamByteOrder.
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*
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* Sets the byte order of the data output stream to @order.
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**/
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void
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g_data_output_stream_set_byte_order (GDataOutputStream *stream,
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GDataStreamByteOrder order)
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{
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GDataOutputStreamPrivate *priv;
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g_return_if_fail (G_IS_DATA_OUTPUT_STREAM (stream));
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priv = stream->priv;
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if (priv->byte_order != order)
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{
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priv->byte_order = order;
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g_object_notify (G_OBJECT (stream), "byte-order");
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}
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}
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/**
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* g_data_output_stream_get_byte_order:
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* @stream: a #GDataOutputStream.
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*
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* Gets the byte order for the stream.
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*
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* Returns: the #GDataStreamByteOrder for the @stream.
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**/
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GDataStreamByteOrder
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g_data_output_stream_get_byte_order (GDataOutputStream *stream)
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{
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN);
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return stream->priv->byte_order;
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}
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/**
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* g_data_output_stream_put_byte:
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* @stream: a #GDataOutputStream.
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* @data: a #guchar.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts a byte into the output stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_byte (GDataOutputStream *stream,
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guchar data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 1,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_int16:
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* @stream: a #GDataOutputStream.
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* @data: a #gint16.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts a signed 16-bit integer into the output stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_int16 (GDataOutputStream *stream,
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gint16 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GINT16_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GINT16_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 2,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_uint16:
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* @stream: a #GDataOutputStream.
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* @data: a #guint16.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts an unsigned 16-bit integer into the output stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_uint16 (GDataOutputStream *stream,
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guint16 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GUINT16_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GUINT16_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 2,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_int32:
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* @stream: a #GDataOutputStream.
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* @data: a #gint32.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts a signed 32-bit integer into the output stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_int32 (GDataOutputStream *stream,
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gint32 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GINT32_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GINT32_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 4,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_uint32:
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* @stream: a #GDataOutputStream.
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* @data: a #guint32.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts an unsigned 32-bit integer into the stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_uint32 (GDataOutputStream *stream,
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guint32 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GUINT32_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GUINT32_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 4,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_int64:
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* @stream: a #GDataOutputStream.
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* @data: a #gint64.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts a signed 64-bit integer into the stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_int64 (GDataOutputStream *stream,
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gint64 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GINT64_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GINT64_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 8,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_uint64:
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* @stream: a #GDataOutputStream.
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* @data: a #guint64.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts an unsigned 64-bit integer into the stream.
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*
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* Returns: %TRUE if @data was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_uint64 (GDataOutputStream *stream,
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guint64 data,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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switch (stream->priv->byte_order)
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{
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case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
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data = GUINT64_TO_BE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
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data = GUINT64_TO_LE (data);
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break;
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case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
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default:
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break;
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}
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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&data, 8,
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&bytes_written,
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cancellable, error);
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}
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/**
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* g_data_output_stream_put_string:
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* @stream: a #GDataOutputStream.
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* @str: a string.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: a #GError, %NULL to ignore.
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*
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* Puts a string into the output stream.
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*
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* Returns: %TRUE if @string was successfully added to the @stream.
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**/
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gboolean
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g_data_output_stream_put_string (GDataOutputStream *stream,
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const char *str,
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GCancellable *cancellable,
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GError **error)
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{
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gsize bytes_written;
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g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
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g_return_val_if_fail (str != NULL, FALSE);
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return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
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str, strlen (str),
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&bytes_written,
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cancellable, error);
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}
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static goffset
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g_data_output_stream_tell (GSeekable *seekable)
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{
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GOutputStream *base_stream;
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GSeekable *base_stream_seekable;
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base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
|
|
if (!G_IS_SEEKABLE (base_stream))
|
|
return 0;
|
|
base_stream_seekable = G_SEEKABLE (base_stream);
|
|
return g_seekable_tell (base_stream_seekable);
|
|
}
|
|
|
|
static gboolean
|
|
g_data_output_stream_can_seek (GSeekable *seekable)
|
|
{
|
|
GOutputStream *base_stream;
|
|
|
|
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
|
|
return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
|
|
}
|
|
|
|
static gboolean
|
|
g_data_output_stream_seek (GSeekable *seekable,
|
|
goffset offset,
|
|
GSeekType type,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GOutputStream *base_stream;
|
|
GSeekable *base_stream_seekable;
|
|
|
|
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
|
|
if (!G_IS_SEEKABLE (base_stream))
|
|
{
|
|
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
|
_("Seek not supported on base stream"));
|
|
return FALSE;
|
|
}
|
|
|
|
base_stream_seekable = G_SEEKABLE (base_stream);
|
|
return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
|
|
}
|
|
|
|
static gboolean
|
|
g_data_output_stream_can_truncate (GSeekable *seekable)
|
|
{
|
|
GOutputStream *base_stream;
|
|
|
|
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
|
|
return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
|
|
}
|
|
|
|
static gboolean
|
|
g_data_output_stream_truncate (GSeekable *seekable,
|
|
goffset offset,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GOutputStream *base_stream;
|
|
GSeekable *base_stream_seekable;
|
|
|
|
base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
|
|
if (!G_IS_SEEKABLE (base_stream))
|
|
{
|
|
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
|
_("Truncate not supported on base stream"));
|
|
return FALSE;
|
|
}
|
|
|
|
base_stream_seekable = G_SEEKABLE (base_stream);
|
|
return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
|
|
}
|