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477d53b2b0
gio/gbufferedoutputstream.c: In function ‘g_buffered_output_stream_set_buffer_size’:
glib/gmacros.h:806:26: error: comparison of integer expressions of different signedness: ‘gsize’ {aka ‘long unsigned int’} and ‘goffset’ {aka ‘long int’}
806 | #define MAX(a, b) (((a) > (b)) ? (a) : (b))
| ^
gio/gbufferedoutputstream.c:211:14: note: in expansion of macro ‘MAX’
211 | size = MAX (size, priv->pos);
| ^~~
Fix signedness warning in gio/gbufferedinputstream.c:g_buffered_input_stream_real_fill()
gio/gbufferedinputstream.c: In function ‘g_buffered_input_stream_real_fill’:
glib/gmacros.h:809:26: error: comparison of integer expressions of different signedness: ‘gssize’ {aka ‘long int’} and ‘gsize’ {aka ‘long unsigned int’}K [-Werror=sign-compare]
809 | #define MIN(a, b) (((a) < (b)) ? (a) : (b))
| ^
gio/gbufferedinputstream.c:664:11: note: in expansion of macro ‘MIN’
664 | count = MIN (count, priv->len - in_buffer);
| ^~~
gio/gbufferedinputstream.c:667:29: error: comparison of integer expressions of different signedness: ‘gsize’ {aka ‘long unsigned int’} and ‘gssize’ {aka ‘long int’}
667 | if (priv->len - priv->end < count)
| ^
Fix signedness warnings in gio/gbufferedinputstream.c:g_buffered_input_stream_real_fill_async()
gio/gbufferedinputstream.c: In function ‘g_buffered_input_stream_real_fill_async’:
glib/gmacros.h:809:26: error: comparison of integer expressions of different signedness: ‘gssize’ {aka ‘long int’} and ‘gsize’ {aka ‘long unsigned int’}
809 | #define MIN(a, b) (((a) < (b)) ? (a) : (b))
| ^
gio/gbufferedinputstream.c:1075:11: note: in expansion of macro ‘MIN’
1075 | count = MIN (count, priv->len - in_buffer);
| ^~~
gio/gbufferedinputstream.c:1078:29: error: comparison of integer expressions of different signedness: ‘gsize’ {aka ‘long unsigned int’} and ‘gssize’ {aka ‘long int’}
1078 | if (priv->len - priv->end < count)
| ^
1271 lines
38 KiB
C
1271 lines
38 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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* Copyright (C) 2007 Jürg Billeter
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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: Christian Kellner <gicmo@gnome.org>
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*/
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#include "config.h"
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#include "gbufferedinputstream.h"
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#include "ginputstream.h"
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#include "gcancellable.h"
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#include "gasyncresult.h"
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#include "gtask.h"
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#include "gseekable.h"
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#include "gioerror.h"
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#include <string.h>
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#include "glibintl.h"
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/**
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* SECTION:gbufferedinputstream
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* @short_description: Buffered Input Stream
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* @include: gio/gio.h
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* @see_also: #GFilterInputStream, #GInputStream
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*
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* Buffered input stream implements #GFilterInputStream and provides
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* for buffered reads.
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*
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* By default, #GBufferedInputStream's buffer size is set at 4 kilobytes.
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*
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* To create a buffered input stream, use g_buffered_input_stream_new(),
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* or g_buffered_input_stream_new_sized() to specify the buffer's size at
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* construction.
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*
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* To get the size of a buffer within a buffered input stream, use
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* g_buffered_input_stream_get_buffer_size(). To change the size of a
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* buffered input stream's buffer, use
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* g_buffered_input_stream_set_buffer_size(). Note that the buffer's size
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* cannot be reduced below the size of the data within the buffer.
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*/
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#define DEFAULT_BUFFER_SIZE 4096
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struct _GBufferedInputStreamPrivate {
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guint8 *buffer;
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gsize len;
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gsize pos;
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gsize end;
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GAsyncReadyCallback outstanding_callback;
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};
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enum {
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PROP_0,
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PROP_BUFSIZE
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};
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static void g_buffered_input_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_buffered_input_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_buffered_input_stream_finalize (GObject *object);
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static gssize g_buffered_input_stream_skip (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static void g_buffered_input_stream_skip_async (GInputStream *stream,
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gsize count,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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static gssize g_buffered_input_stream_skip_finish (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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static gssize g_buffered_input_stream_read (GInputStream *stream,
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void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static gssize g_buffered_input_stream_real_fill (GBufferedInputStream *stream,
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gssize count,
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GCancellable *cancellable,
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GError **error);
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static void g_buffered_input_stream_real_fill_async (GBufferedInputStream *stream,
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gssize count,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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static gssize g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream,
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GAsyncResult *result,
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GError **error);
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static void g_buffered_input_stream_seekable_iface_init (GSeekableIface *iface);
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static goffset g_buffered_input_stream_tell (GSeekable *seekable);
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static gboolean g_buffered_input_stream_can_seek (GSeekable *seekable);
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static gboolean g_buffered_input_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_buffered_input_stream_can_truncate (GSeekable *seekable);
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static gboolean g_buffered_input_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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static void compact_buffer (GBufferedInputStream *stream);
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G_DEFINE_TYPE_WITH_CODE (GBufferedInputStream,
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g_buffered_input_stream,
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G_TYPE_FILTER_INPUT_STREAM,
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G_ADD_PRIVATE (GBufferedInputStream)
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G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
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g_buffered_input_stream_seekable_iface_init))
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static void
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g_buffered_input_stream_class_init (GBufferedInputStreamClass *klass)
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{
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GObjectClass *object_class;
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GInputStreamClass *istream_class;
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GBufferedInputStreamClass *bstream_class;
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = g_buffered_input_stream_get_property;
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object_class->set_property = g_buffered_input_stream_set_property;
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object_class->finalize = g_buffered_input_stream_finalize;
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istream_class = G_INPUT_STREAM_CLASS (klass);
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istream_class->skip = g_buffered_input_stream_skip;
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istream_class->skip_async = g_buffered_input_stream_skip_async;
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istream_class->skip_finish = g_buffered_input_stream_skip_finish;
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istream_class->read_fn = g_buffered_input_stream_read;
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bstream_class = G_BUFFERED_INPUT_STREAM_CLASS (klass);
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bstream_class->fill = g_buffered_input_stream_real_fill;
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bstream_class->fill_async = g_buffered_input_stream_real_fill_async;
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bstream_class->fill_finish = g_buffered_input_stream_real_fill_finish;
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g_object_class_install_property (object_class,
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PROP_BUFSIZE,
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g_param_spec_uint ("buffer-size",
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P_("Buffer Size"),
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P_("The size of the backend buffer"),
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1,
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G_MAXUINT,
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DEFAULT_BUFFER_SIZE,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
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G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
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}
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/**
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* g_buffered_input_stream_get_buffer_size:
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* @stream: a #GBufferedInputStream
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*
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* Gets the size of the input buffer.
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*
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* Returns: the current buffer size.
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*/
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gsize
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g_buffered_input_stream_get_buffer_size (GBufferedInputStream *stream)
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{
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g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), 0);
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return stream->priv->len;
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}
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/**
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* g_buffered_input_stream_set_buffer_size:
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* @stream: a #GBufferedInputStream
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* @size: a #gsize
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*
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* Sets the size of the internal buffer of @stream to @size, or to the
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* size of the contents of the buffer. The buffer can never be resized
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* smaller than its current contents.
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*/
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void
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g_buffered_input_stream_set_buffer_size (GBufferedInputStream *stream,
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gsize size)
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{
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GBufferedInputStreamPrivate *priv;
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gsize in_buffer;
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guint8 *buffer;
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g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream));
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priv = stream->priv;
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if (priv->len == size)
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return;
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if (priv->buffer)
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{
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in_buffer = priv->end - priv->pos;
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/* Never resize smaller than current buffer contents */
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size = MAX (size, in_buffer);
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buffer = g_malloc (size);
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memcpy (buffer, priv->buffer + priv->pos, in_buffer);
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priv->len = size;
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priv->pos = 0;
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priv->end = in_buffer;
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g_free (priv->buffer);
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priv->buffer = buffer;
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}
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else
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{
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priv->len = size;
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priv->pos = 0;
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priv->end = 0;
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priv->buffer = g_malloc (size);
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}
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g_object_notify (G_OBJECT (stream), "buffer-size");
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}
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static void
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g_buffered_input_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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GBufferedInputStream *bstream;
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bstream = G_BUFFERED_INPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_BUFSIZE:
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g_buffered_input_stream_set_buffer_size (bstream, g_value_get_uint (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_buffered_input_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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GBufferedInputStreamPrivate *priv;
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GBufferedInputStream *bstream;
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bstream = G_BUFFERED_INPUT_STREAM (object);
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priv = bstream->priv;
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switch (prop_id)
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{
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case PROP_BUFSIZE:
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g_value_set_uint (value, priv->len);
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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_buffered_input_stream_finalize (GObject *object)
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{
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GBufferedInputStreamPrivate *priv;
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GBufferedInputStream *stream;
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stream = G_BUFFERED_INPUT_STREAM (object);
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priv = stream->priv;
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g_free (priv->buffer);
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G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize (object);
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}
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static void
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g_buffered_input_stream_seekable_iface_init (GSeekableIface *iface)
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{
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iface->tell = g_buffered_input_stream_tell;
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iface->can_seek = g_buffered_input_stream_can_seek;
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iface->seek = g_buffered_input_stream_seek;
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iface->can_truncate = g_buffered_input_stream_can_truncate;
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iface->truncate_fn = g_buffered_input_stream_truncate;
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}
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static void
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g_buffered_input_stream_init (GBufferedInputStream *stream)
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{
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stream->priv = g_buffered_input_stream_get_instance_private (stream);
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}
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/**
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* g_buffered_input_stream_new:
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* @base_stream: a #GInputStream
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*
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* Creates a new #GInputStream from the given @base_stream, with
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* a buffer set to the default size (4 kilobytes).
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*
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* Returns: a #GInputStream for the given @base_stream.
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*/
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GInputStream *
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g_buffered_input_stream_new (GInputStream *base_stream)
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{
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GInputStream *stream;
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g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL);
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stream = g_object_new (G_TYPE_BUFFERED_INPUT_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_buffered_input_stream_new_sized:
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* @base_stream: a #GInputStream
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* @size: a #gsize
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*
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* Creates a new #GBufferedInputStream from the given @base_stream,
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* with a buffer set to @size.
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*
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* Returns: a #GInputStream.
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*/
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GInputStream *
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g_buffered_input_stream_new_sized (GInputStream *base_stream,
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gsize size)
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{
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GInputStream *stream;
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g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL);
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stream = g_object_new (G_TYPE_BUFFERED_INPUT_STREAM,
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"base-stream", base_stream,
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"buffer-size", (guint)size,
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NULL);
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return stream;
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}
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/**
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* g_buffered_input_stream_fill:
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* @stream: a #GBufferedInputStream
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* @count: the number of bytes that will be read from the stream
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
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* @error: location to store the error occurring, or %NULL to ignore
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*
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* Tries to read @count bytes from the stream into the buffer.
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* Will block during this read.
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*
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* If @count is zero, returns zero and does nothing. A value of @count
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* larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
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*
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* On success, the number of bytes read into the buffer is returned.
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* It is not an error if this is not the same as the requested size, as it
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* can happen e.g. near the end of a file. Zero is returned on end of file
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* (or if @count is zero), but never otherwise.
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*
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* If @count is -1 then the attempted read size is equal to the number of
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* bytes that are required to fill the buffer.
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*
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* If @cancellable is not %NULL, then the operation can be cancelled by
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* triggering the cancellable object from another thread. If the operation
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* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
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* operation was partially finished when the operation was cancelled the
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* partial result will be returned, without an error.
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*
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* On error -1 is returned and @error is set accordingly.
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*
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* For the asynchronous, non-blocking, version of this function, see
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* g_buffered_input_stream_fill_async().
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*
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* Returns: the number of bytes read into @stream's buffer, up to @count,
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* or -1 on error.
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*/
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gssize
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g_buffered_input_stream_fill (GBufferedInputStream *stream,
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gssize count,
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GCancellable *cancellable,
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GError **error)
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{
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GBufferedInputStreamClass *class;
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GInputStream *input_stream;
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gssize res;
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g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
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input_stream = G_INPUT_STREAM (stream);
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if (count < -1)
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
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_("Too large count value passed to %s"), G_STRFUNC);
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return -1;
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}
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if (!g_input_stream_set_pending (input_stream, error))
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return -1;
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|
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if (cancellable)
|
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g_cancellable_push_current (cancellable);
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|
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class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
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res = class->fill (stream, count, cancellable, error);
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|
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if (cancellable)
|
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g_cancellable_pop_current (cancellable);
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|
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g_input_stream_clear_pending (input_stream);
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|
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return res;
|
|
}
|
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|
|
static void
|
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async_fill_callback_wrapper (GObject *source_object,
|
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GAsyncResult *res,
|
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gpointer user_data)
|
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{
|
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GBufferedInputStream *stream = G_BUFFERED_INPUT_STREAM (source_object);
|
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|
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g_input_stream_clear_pending (G_INPUT_STREAM (stream));
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(*stream->priv->outstanding_callback) (source_object, res, user_data);
|
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g_object_unref (stream);
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_fill_async:
|
|
* @stream: a #GBufferedInputStream
|
|
* @count: the number of bytes that will be read from the stream
|
|
* @io_priority: the [I/O priority][io-priority] of the request
|
|
* @cancellable: (nullable): optional #GCancellable object
|
|
* @callback: (scope async): a #GAsyncReadyCallback
|
|
* @user_data: (closure): a #gpointer
|
|
*
|
|
* Reads data into @stream's buffer asynchronously, up to @count size.
|
|
* @io_priority can be used to prioritize reads. For the synchronous
|
|
* version of this function, see g_buffered_input_stream_fill().
|
|
*
|
|
* If @count is -1 then the attempted read size is equal to the number
|
|
* of bytes that are required to fill the buffer.
|
|
*/
|
|
void
|
|
g_buffered_input_stream_fill_async (GBufferedInputStream *stream,
|
|
gssize count,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
GBufferedInputStreamClass *class;
|
|
GError *error = NULL;
|
|
|
|
g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream));
|
|
|
|
if (count == 0)
|
|
{
|
|
GTask *task;
|
|
|
|
task = g_task_new (stream, cancellable, callback, user_data);
|
|
g_task_set_source_tag (task, g_buffered_input_stream_fill_async);
|
|
g_task_return_int (task, 0);
|
|
g_object_unref (task);
|
|
return;
|
|
}
|
|
|
|
if (count < -1)
|
|
{
|
|
g_task_report_new_error (stream, callback, user_data,
|
|
g_buffered_input_stream_fill_async,
|
|
G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
|
|
_("Too large count value passed to %s"),
|
|
G_STRFUNC);
|
|
return;
|
|
}
|
|
|
|
if (!g_input_stream_set_pending (G_INPUT_STREAM (stream), &error))
|
|
{
|
|
g_task_report_error (stream, callback, user_data,
|
|
g_buffered_input_stream_fill_async,
|
|
error);
|
|
return;
|
|
}
|
|
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
|
|
stream->priv->outstanding_callback = callback;
|
|
g_object_ref (stream);
|
|
class->fill_async (stream, count, io_priority, cancellable,
|
|
async_fill_callback_wrapper, user_data);
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_fill_finish:
|
|
* @stream: a #GBufferedInputStream
|
|
* @result: a #GAsyncResult
|
|
* @error: a #GError
|
|
*
|
|
* Finishes an asynchronous read.
|
|
*
|
|
* Returns: a #gssize of the read stream, or `-1` on an error.
|
|
*/
|
|
gssize
|
|
g_buffered_input_stream_fill_finish (GBufferedInputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStreamClass *class;
|
|
|
|
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
|
|
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), -1);
|
|
|
|
if (g_async_result_legacy_propagate_error (result, error))
|
|
return -1;
|
|
else if (g_async_result_is_tagged (result, g_buffered_input_stream_fill_async))
|
|
return g_task_propagate_int (G_TASK (result), error);
|
|
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
return class->fill_finish (stream, result, error);
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_get_available:
|
|
* @stream: #GBufferedInputStream
|
|
*
|
|
* Gets the size of the available data within the stream.
|
|
*
|
|
* Returns: size of the available stream.
|
|
*/
|
|
gsize
|
|
g_buffered_input_stream_get_available (GBufferedInputStream *stream)
|
|
{
|
|
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
|
|
|
|
return stream->priv->end - stream->priv->pos;
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_peek:
|
|
* @stream: a #GBufferedInputStream
|
|
* @buffer: (array length=count) (element-type guint8): a pointer to
|
|
* an allocated chunk of memory
|
|
* @offset: a #gsize
|
|
* @count: a #gsize
|
|
*
|
|
* Peeks in the buffer, copying data of size @count into @buffer,
|
|
* offset @offset bytes.
|
|
*
|
|
* Returns: a #gsize of the number of bytes peeked, or -1 on error.
|
|
*/
|
|
gsize
|
|
g_buffered_input_stream_peek (GBufferedInputStream *stream,
|
|
void *buffer,
|
|
gsize offset,
|
|
gsize count)
|
|
{
|
|
gsize available;
|
|
gsize end;
|
|
|
|
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
|
|
g_return_val_if_fail (buffer != NULL, -1);
|
|
|
|
available = g_buffered_input_stream_get_available (stream);
|
|
|
|
if (offset > available)
|
|
return 0;
|
|
|
|
end = MIN (offset + count, available);
|
|
count = end - offset;
|
|
|
|
memcpy (buffer, stream->priv->buffer + stream->priv->pos + offset, count);
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_peek_buffer:
|
|
* @stream: a #GBufferedInputStream
|
|
* @count: (out): a #gsize to get the number of bytes available in the buffer
|
|
*
|
|
* Returns the buffer with the currently available bytes. The returned
|
|
* buffer must not be modified and will become invalid when reading from
|
|
* the stream or filling the buffer.
|
|
*
|
|
* Returns: (array length=count) (element-type guint8) (transfer none):
|
|
* read-only buffer
|
|
*/
|
|
const void*
|
|
g_buffered_input_stream_peek_buffer (GBufferedInputStream *stream,
|
|
gsize *count)
|
|
{
|
|
GBufferedInputStreamPrivate *priv;
|
|
|
|
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), NULL);
|
|
|
|
priv = stream->priv;
|
|
|
|
if (count)
|
|
*count = priv->end - priv->pos;
|
|
|
|
return priv->buffer + priv->pos;
|
|
}
|
|
|
|
static void
|
|
compact_buffer (GBufferedInputStream *stream)
|
|
{
|
|
GBufferedInputStreamPrivate *priv;
|
|
gsize current_size;
|
|
|
|
priv = stream->priv;
|
|
|
|
current_size = priv->end - priv->pos;
|
|
|
|
memmove (priv->buffer, priv->buffer + priv->pos, current_size);
|
|
|
|
priv->pos = 0;
|
|
priv->end = current_size;
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_input_stream_real_fill (GBufferedInputStream *stream,
|
|
gssize count,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStreamPrivate *priv;
|
|
GInputStream *base_stream;
|
|
gssize nread;
|
|
gsize in_buffer;
|
|
|
|
priv = stream->priv;
|
|
|
|
if (count == -1)
|
|
count = priv->len;
|
|
|
|
in_buffer = priv->end - priv->pos;
|
|
|
|
/* Never fill more than can fit in the buffer */
|
|
count = MIN ((gsize) count, priv->len - in_buffer);
|
|
|
|
/* If requested length does not fit at end, compact */
|
|
if (priv->len - priv->end < (gsize) count)
|
|
compact_buffer (stream);
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
|
|
nread = g_input_stream_read (base_stream,
|
|
priv->buffer + priv->end,
|
|
count,
|
|
cancellable,
|
|
error);
|
|
|
|
if (nread > 0)
|
|
priv->end += nread;
|
|
|
|
return nread;
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_input_stream_skip (GInputStream *stream,
|
|
gsize count,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
GBufferedInputStreamClass *class;
|
|
GInputStream *base_stream;
|
|
gsize available, bytes_skipped;
|
|
gssize nread;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (stream);
|
|
priv = bstream->priv;
|
|
|
|
available = priv->end - priv->pos;
|
|
|
|
if (count <= available)
|
|
{
|
|
priv->pos += count;
|
|
return count;
|
|
}
|
|
|
|
/* Full request not available, skip all currently available and
|
|
* request refill for more
|
|
*/
|
|
|
|
priv->pos = 0;
|
|
priv->end = 0;
|
|
bytes_skipped = available;
|
|
count -= available;
|
|
|
|
if (bytes_skipped > 0)
|
|
error = NULL; /* Ignore further errors if we already read some data */
|
|
|
|
if (count > priv->len)
|
|
{
|
|
/* Large request, shortcut buffer */
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
|
|
|
|
nread = g_input_stream_skip (base_stream,
|
|
count,
|
|
cancellable,
|
|
error);
|
|
|
|
if (nread < 0 && bytes_skipped == 0)
|
|
return -1;
|
|
|
|
if (nread > 0)
|
|
bytes_skipped += nread;
|
|
|
|
return bytes_skipped;
|
|
}
|
|
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
nread = class->fill (bstream, priv->len, cancellable, error);
|
|
|
|
if (nread < 0)
|
|
{
|
|
if (bytes_skipped == 0)
|
|
return -1;
|
|
else
|
|
return bytes_skipped;
|
|
}
|
|
|
|
available = priv->end - priv->pos;
|
|
count = MIN (count, available);
|
|
|
|
bytes_skipped += count;
|
|
priv->pos += count;
|
|
|
|
return bytes_skipped;
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_input_stream_read (GInputStream *stream,
|
|
void *buffer,
|
|
gsize count,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
GBufferedInputStreamClass *class;
|
|
GInputStream *base_stream;
|
|
gsize available, bytes_read;
|
|
gssize nread;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (stream);
|
|
priv = bstream->priv;
|
|
|
|
available = priv->end - priv->pos;
|
|
|
|
if (count <= available)
|
|
{
|
|
memcpy (buffer, priv->buffer + priv->pos, count);
|
|
priv->pos += count;
|
|
return count;
|
|
}
|
|
|
|
/* Full request not available, read all currently available and
|
|
* request refill for more
|
|
*/
|
|
|
|
memcpy (buffer, priv->buffer + priv->pos, available);
|
|
priv->pos = 0;
|
|
priv->end = 0;
|
|
bytes_read = available;
|
|
count -= available;
|
|
|
|
if (bytes_read > 0)
|
|
error = NULL; /* Ignore further errors if we already read some data */
|
|
|
|
if (count > priv->len)
|
|
{
|
|
/* Large request, shortcut buffer */
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
|
|
|
|
nread = g_input_stream_read (base_stream,
|
|
(char *)buffer + bytes_read,
|
|
count,
|
|
cancellable,
|
|
error);
|
|
|
|
if (nread < 0 && bytes_read == 0)
|
|
return -1;
|
|
|
|
if (nread > 0)
|
|
bytes_read += nread;
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
nread = class->fill (bstream, priv->len, cancellable, error);
|
|
if (nread < 0)
|
|
{
|
|
if (bytes_read == 0)
|
|
return -1;
|
|
else
|
|
return bytes_read;
|
|
}
|
|
|
|
available = priv->end - priv->pos;
|
|
count = MIN (count, available);
|
|
|
|
memcpy ((char *)buffer + bytes_read, (char *)priv->buffer + priv->pos, count);
|
|
bytes_read += count;
|
|
priv->pos += count;
|
|
|
|
return bytes_read;
|
|
}
|
|
|
|
static goffset
|
|
g_buffered_input_stream_tell (GSeekable *seekable)
|
|
{
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
GInputStream *base_stream;
|
|
GSeekable *base_stream_seekable;
|
|
gsize available;
|
|
goffset base_offset;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (seekable);
|
|
priv = bstream->priv;
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (seekable)->base_stream;
|
|
if (!G_IS_SEEKABLE (base_stream))
|
|
return 0;
|
|
base_stream_seekable = G_SEEKABLE (base_stream);
|
|
|
|
available = priv->end - priv->pos;
|
|
base_offset = g_seekable_tell (base_stream_seekable);
|
|
|
|
return base_offset - available;
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_input_stream_can_seek (GSeekable *seekable)
|
|
{
|
|
GInputStream *base_stream;
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (seekable)->base_stream;
|
|
return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_input_stream_seek (GSeekable *seekable,
|
|
goffset offset,
|
|
GSeekType type,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
GInputStream *base_stream;
|
|
GSeekable *base_stream_seekable;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (seekable);
|
|
priv = bstream->priv;
|
|
|
|
base_stream = G_FILTER_INPUT_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);
|
|
|
|
if (type == G_SEEK_CUR)
|
|
{
|
|
if (offset <= priv->end - priv->pos && offset >= -priv->pos)
|
|
{
|
|
priv->pos += offset;
|
|
return TRUE;
|
|
}
|
|
else
|
|
{
|
|
offset -= priv->end - priv->pos;
|
|
}
|
|
}
|
|
|
|
if (g_seekable_seek (base_stream_seekable, offset, type, cancellable, error))
|
|
{
|
|
priv->pos = 0;
|
|
priv->end = 0;
|
|
return TRUE;
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_input_stream_can_truncate (GSeekable *seekable)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_input_stream_truncate (GSeekable *seekable,
|
|
goffset offset,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_NOT_SUPPORTED,
|
|
_("Cannot truncate GBufferedInputStream"));
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* g_buffered_input_stream_read_byte:
|
|
* @stream: a #GBufferedInputStream
|
|
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
|
|
* @error: location to store the error occurring, or %NULL to ignore
|
|
*
|
|
* Tries to read a single byte from the stream or the buffer. Will block
|
|
* during this read.
|
|
*
|
|
* On success, the byte read from the stream is returned. On end of stream
|
|
* -1 is returned but it's not an exceptional error and @error is not set.
|
|
*
|
|
* If @cancellable is not %NULL, then the operation can be cancelled by
|
|
* triggering the cancellable object from another thread. If the operation
|
|
* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
|
|
* operation was partially finished when the operation was cancelled the
|
|
* partial result will be returned, without an error.
|
|
*
|
|
* On error -1 is returned and @error is set accordingly.
|
|
*
|
|
* Returns: the byte read from the @stream, or -1 on end of stream or error.
|
|
*/
|
|
int
|
|
g_buffered_input_stream_read_byte (GBufferedInputStream *stream,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GBufferedInputStreamPrivate *priv;
|
|
GBufferedInputStreamClass *class;
|
|
GInputStream *input_stream;
|
|
gsize available;
|
|
gssize nread;
|
|
|
|
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
|
|
|
|
priv = stream->priv;
|
|
input_stream = G_INPUT_STREAM (stream);
|
|
|
|
if (g_input_stream_is_closed (input_stream))
|
|
{
|
|
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
|
|
_("Stream is already closed"));
|
|
return -1;
|
|
}
|
|
|
|
if (!g_input_stream_set_pending (input_stream, error))
|
|
return -1;
|
|
|
|
available = priv->end - priv->pos;
|
|
|
|
if (available != 0)
|
|
{
|
|
g_input_stream_clear_pending (input_stream);
|
|
return priv->buffer[priv->pos++];
|
|
}
|
|
|
|
/* Byte not available, request refill for more */
|
|
|
|
if (cancellable)
|
|
g_cancellable_push_current (cancellable);
|
|
|
|
priv->pos = 0;
|
|
priv->end = 0;
|
|
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
nread = class->fill (stream, priv->len, cancellable, error);
|
|
|
|
if (cancellable)
|
|
g_cancellable_pop_current (cancellable);
|
|
|
|
g_input_stream_clear_pending (input_stream);
|
|
|
|
if (nread <= 0)
|
|
return -1; /* error or end of stream */
|
|
|
|
return priv->buffer[priv->pos++];
|
|
}
|
|
|
|
/* ************************** */
|
|
/* Async stuff implementation */
|
|
/* ************************** */
|
|
|
|
static void
|
|
fill_async_callback (GObject *source_object,
|
|
GAsyncResult *result,
|
|
gpointer user_data)
|
|
{
|
|
GError *error;
|
|
gssize res;
|
|
GTask *task = user_data;
|
|
|
|
error = NULL;
|
|
res = g_input_stream_read_finish (G_INPUT_STREAM (source_object),
|
|
result, &error);
|
|
if (res == -1)
|
|
g_task_return_error (task, error);
|
|
else
|
|
{
|
|
GBufferedInputStream *stream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
|
|
stream = g_task_get_source_object (task);
|
|
priv = G_BUFFERED_INPUT_STREAM (stream)->priv;
|
|
|
|
g_assert_cmpint (priv->end + res, <=, priv->len);
|
|
priv->end += res;
|
|
|
|
g_task_return_int (task, res);
|
|
}
|
|
|
|
g_object_unref (task);
|
|
}
|
|
|
|
static void
|
|
g_buffered_input_stream_real_fill_async (GBufferedInputStream *stream,
|
|
gssize count,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
GBufferedInputStreamPrivate *priv;
|
|
GInputStream *base_stream;
|
|
GTask *task;
|
|
gsize in_buffer;
|
|
|
|
priv = stream->priv;
|
|
|
|
if (count == -1)
|
|
count = priv->len;
|
|
|
|
in_buffer = priv->end - priv->pos;
|
|
|
|
/* Never fill more than can fit in the buffer */
|
|
count = MIN ((gsize) count, priv->len - in_buffer);
|
|
|
|
/* If requested length does not fit at end, compact */
|
|
if (priv->len - priv->end < (gsize) count)
|
|
compact_buffer (stream);
|
|
|
|
task = g_task_new (stream, cancellable, callback, user_data);
|
|
g_task_set_source_tag (task, g_buffered_input_stream_real_fill_async);
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
|
|
g_input_stream_read_async (base_stream,
|
|
priv->buffer + priv->end,
|
|
count,
|
|
io_priority,
|
|
cancellable,
|
|
fill_async_callback,
|
|
task);
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (g_task_is_valid (result, stream), -1);
|
|
|
|
return g_task_propagate_int (G_TASK (result), error);
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
gssize bytes_skipped;
|
|
gssize count;
|
|
} SkipAsyncData;
|
|
|
|
static void
|
|
free_skip_async_data (gpointer _data)
|
|
{
|
|
SkipAsyncData *data = _data;
|
|
g_slice_free (SkipAsyncData, data);
|
|
}
|
|
|
|
static void
|
|
large_skip_callback (GObject *source_object,
|
|
GAsyncResult *result,
|
|
gpointer user_data)
|
|
{
|
|
GTask *task = G_TASK (user_data);
|
|
SkipAsyncData *data;
|
|
GError *error;
|
|
gssize nread;
|
|
|
|
data = g_task_get_task_data (task);
|
|
|
|
error = NULL;
|
|
nread = g_input_stream_skip_finish (G_INPUT_STREAM (source_object),
|
|
result, &error);
|
|
|
|
/* Only report the error if we've not already read some data */
|
|
if (nread < 0 && data->bytes_skipped == 0)
|
|
g_task_return_error (task, error);
|
|
else
|
|
{
|
|
if (error)
|
|
g_error_free (error);
|
|
|
|
if (nread > 0)
|
|
data->bytes_skipped += nread;
|
|
|
|
g_task_return_int (task, data->bytes_skipped);
|
|
}
|
|
|
|
g_object_unref (task);
|
|
}
|
|
|
|
static void
|
|
skip_fill_buffer_callback (GObject *source_object,
|
|
GAsyncResult *result,
|
|
gpointer user_data)
|
|
{
|
|
GTask *task = G_TASK (user_data);
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
SkipAsyncData *data;
|
|
GError *error;
|
|
gssize nread;
|
|
gsize available;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (source_object);
|
|
priv = bstream->priv;
|
|
|
|
data = g_task_get_task_data (task);
|
|
|
|
error = NULL;
|
|
nread = g_buffered_input_stream_fill_finish (bstream,
|
|
result, &error);
|
|
|
|
if (nread < 0 && data->bytes_skipped == 0)
|
|
g_task_return_error (task, error);
|
|
else
|
|
{
|
|
if (error)
|
|
g_error_free (error);
|
|
|
|
if (nread > 0)
|
|
{
|
|
available = priv->end - priv->pos;
|
|
data->count = MIN (data->count, available);
|
|
|
|
data->bytes_skipped += data->count;
|
|
priv->pos += data->count;
|
|
}
|
|
|
|
g_task_return_int (task, data->bytes_skipped);
|
|
}
|
|
|
|
g_object_unref (task);
|
|
}
|
|
|
|
static void
|
|
g_buffered_input_stream_skip_async (GInputStream *stream,
|
|
gsize count,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
GBufferedInputStream *bstream;
|
|
GBufferedInputStreamPrivate *priv;
|
|
GBufferedInputStreamClass *class;
|
|
GInputStream *base_stream;
|
|
gsize available;
|
|
GTask *task;
|
|
SkipAsyncData *data;
|
|
|
|
bstream = G_BUFFERED_INPUT_STREAM (stream);
|
|
priv = bstream->priv;
|
|
|
|
data = g_slice_new (SkipAsyncData);
|
|
data->bytes_skipped = 0;
|
|
task = g_task_new (stream, cancellable, callback, user_data);
|
|
g_task_set_source_tag (task, g_buffered_input_stream_skip_async);
|
|
g_task_set_task_data (task, data, free_skip_async_data);
|
|
|
|
available = priv->end - priv->pos;
|
|
|
|
if (count <= available)
|
|
{
|
|
priv->pos += count;
|
|
|
|
g_task_return_int (task, count);
|
|
g_object_unref (task);
|
|
return;
|
|
}
|
|
|
|
/* Full request not available, skip all currently available
|
|
* and request refill for more
|
|
*/
|
|
|
|
priv->pos = 0;
|
|
priv->end = 0;
|
|
|
|
count -= available;
|
|
|
|
data->bytes_skipped = available;
|
|
data->count = count;
|
|
|
|
if (count > priv->len)
|
|
{
|
|
/* Large request, shortcut buffer */
|
|
|
|
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
|
|
|
|
g_input_stream_skip_async (base_stream,
|
|
count,
|
|
io_priority, cancellable,
|
|
large_skip_callback,
|
|
task);
|
|
}
|
|
else
|
|
{
|
|
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
|
|
class->fill_async (bstream, priv->len, io_priority, cancellable,
|
|
skip_fill_buffer_callback, task);
|
|
}
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_input_stream_skip_finish (GInputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (g_task_is_valid (result, stream), -1);
|
|
|
|
return g_task_propagate_int (G_TASK (result), error);
|
|
}
|