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glib/gio/gbufferedinputstream.c
Matthias Clasen c524cabff2 Add docs for etags 
svn path=/trunk/; revision=6001
2007-11-30 18:11:03 +00:00

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
* Copyright (C) 2007 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Christian Kellner <gicmo@gnome.org>
*/
#include <config.h>
#include "gbufferedinputstream.h"
#include "ginputstream.h"
#include "gsimpleasyncresult.h"
#include <string.h>
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gbufferedinputstream
* @short_description: Buffered Input Stream
* @see_also: #GFilterInputStream, #GInputStream
*
* Buffered input stream implements #GFilterInputStream and provides
* for buffered reads.
*
* By default, #GBufferedInputStream's buffer size is set at 4 kilobytes.
*
* To create a buffered input stream, use g_buffered_input_stream_new(), or
* g_buffered_input_stream_new_sized() to specify the buffer's size at construction.
*
* To get the size of a buffer within a buffered input stream, use
* g_buffered_input_stream_get_buffer_size(). To change the size of a
* buffered input stream's buffer, use g_buffered_input_stream_set_buffer_size().
* Note: the buffer's size cannot be reduced below the size of the data within the
* buffer.
*
**/
#define DEFAULT_BUFFER_SIZE 4096
struct _GBufferedInputStreamPrivate {
guint8 *buffer;
gsize len;
gsize pos;
gsize end;
GAsyncReadyCallback outstanding_callback;
};
enum {
PROP_0,
PROP_BUFSIZE
};
static void g_buffered_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_buffered_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void g_buffered_input_stream_finalize (GObject *object);
static gssize g_buffered_input_stream_skip (GInputStream *stream,
gsize count,
GCancellable *cancellable,
GError **error);
static void g_buffered_input_stream_skip_async (GInputStream *stream,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
static gssize g_buffered_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static gssize g_buffered_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static void g_buffered_input_stream_read_async (GInputStream *stream,
void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
static gssize g_buffered_input_stream_read_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static gssize g_buffered_input_stream_real_fill (GBufferedInputStream *stream,
gssize count,
GCancellable *cancellable,
GError **error);
static void g_buffered_input_stream_real_fill_async (GBufferedInputStream *stream,
gssize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
static gssize g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream,
GAsyncResult *result,
GError **error);
static void compact_buffer (GBufferedInputStream *stream);
G_DEFINE_TYPE (GBufferedInputStream,
g_buffered_input_stream,
G_TYPE_FILTER_INPUT_STREAM)
static void
g_buffered_input_stream_class_init (GBufferedInputStreamClass *klass)
{
GObjectClass *object_class;
GInputStreamClass *istream_class;
GBufferedInputStreamClass *bstream_class;
g_type_class_add_private (klass, sizeof (GBufferedInputStreamPrivate));
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = g_buffered_input_stream_get_property;
object_class->set_property = g_buffered_input_stream_set_property;
object_class->finalize = g_buffered_input_stream_finalize;
istream_class = G_INPUT_STREAM_CLASS (klass);
istream_class->skip = g_buffered_input_stream_skip;
istream_class->skip_async = g_buffered_input_stream_skip_async;
istream_class->skip_finish = g_buffered_input_stream_skip_finish;
istream_class->read = g_buffered_input_stream_read;
istream_class->read_async = g_buffered_input_stream_read_async;
istream_class->read_finish = g_buffered_input_stream_read_finish;
bstream_class = G_BUFFERED_INPUT_STREAM_CLASS (klass);
bstream_class->fill = g_buffered_input_stream_real_fill;
bstream_class->fill_async = g_buffered_input_stream_real_fill_async;
bstream_class->fill_finish = g_buffered_input_stream_real_fill_finish;
g_object_class_install_property (object_class,
PROP_BUFSIZE,
g_param_spec_uint ("buffer-size",
P_("Buffer Size"),
P_("The size of the backend buffer"),
1,
G_MAXUINT,
DEFAULT_BUFFER_SIZE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
}
/**
* g_buffered_input_stream_get_buffer_size:
* @stream: #GBufferedInputStream.
*
* Gets the size of the input buffer.
*
* Returns: the current buffer size, or %-1 on error.
**/
gsize
g_buffered_input_stream_get_buffer_size (GBufferedInputStream *stream)
{
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
return stream->priv->len;
}
/**
* g_buffered_input_stream_set_buffer_size:
* @stream: #GBufferedInputStream.
* @size: a #gsize.
*
* Sets the size of the internal buffer of @stream to @size, or to the
* size of the contents of the buffer. The buffer can never be resized
* smaller than its current contents.
**/
void
g_buffered_input_stream_set_buffer_size (GBufferedInputStream *stream,
gsize size)
{
GBufferedInputStreamPrivate *priv;
gsize in_buffer;
guint8 *buffer;
g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream));
priv = stream->priv;
if (priv->buffer)
{
in_buffer = priv->end - priv->pos;
/* Never resize smaller than current buffer contents */
size = MAX (size, in_buffer);
buffer = g_malloc (size);
memcpy (buffer, priv->buffer + priv->pos, in_buffer);
priv->len = size;
priv->pos = 0;
priv->end = in_buffer;
g_free (priv->buffer);
priv->buffer = buffer;
}
else
{
priv->len = size;
priv->pos = 0;
priv->end = 0;
priv->buffer = g_malloc (size);
}
}
static void
g_buffered_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GBufferedInputStreamPrivate *priv;
GBufferedInputStream *bstream;
bstream = G_BUFFERED_INPUT_STREAM (object);
priv = bstream->priv;
switch (prop_id)
{
case PROP_BUFSIZE:
g_buffered_input_stream_set_buffer_size (bstream, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_buffered_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GBufferedInputStreamPrivate *priv;
GBufferedInputStream *bstream;
bstream = G_BUFFERED_INPUT_STREAM (object);
priv = bstream->priv;
switch (prop_id)
{
case PROP_BUFSIZE:
g_value_set_uint (value, priv->len);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_buffered_input_stream_finalize (GObject *object)
{
GBufferedInputStreamPrivate *priv;
GBufferedInputStream *stream;
stream = G_BUFFERED_INPUT_STREAM (object);
priv = stream->priv;
g_free (priv->buffer);
if (G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize)
(*G_OBJECT_CLASS (g_buffered_input_stream_parent_class)->finalize) (object);
}
static void
g_buffered_input_stream_init (GBufferedInputStream *stream)
{
stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
G_TYPE_BUFFERED_INPUT_STREAM,
GBufferedInputStreamPrivate);
}
/**
* g_buffered_input_stream_new:
* @base_stream: a #GInputStream.
*
* Creates a new #GInputStream from the given @base_stream, with
* a buffer set to the default size (4 kilobytes).
*
* Returns: a #GInputStream for the given @base_stream.
**/
GInputStream *
g_buffered_input_stream_new (GInputStream *base_stream)
{
GInputStream *stream;
g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL);
stream = g_object_new (G_TYPE_BUFFERED_INPUT_STREAM,
"base-stream", base_stream,
NULL);
return stream;
}
/**
* g_buffered_input_stream_new_sized:
* @base_stream: a #GOutputStream.
* @size: a #gsize.
*
* Creates a new #GBufferedInputStream from the given @base_stream,
* with a buffer set to @size.
*
* Returns: a #GInputStream.
**/
GInputStream *
g_buffered_input_stream_new_sized (GInputStream *base_stream,
gsize size)
{
GInputStream *stream;
g_return_val_if_fail (G_IS_INPUT_STREAM (base_stream), NULL);
stream = g_object_new (G_TYPE_BUFFERED_INPUT_STREAM,
"base-stream", base_stream,
"buffer-size", (guint)size,
NULL);
return stream;
}
/**
* g_buffered_input_stream_fill:
* @stream: #GBufferedInputStream.
* @count: the number of bytes that will be read from the stream.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occuring, or %NULL to ignore.
*
* Tries to read @count bytes from the stream into the buffer.
* Will block during this read.
*
* If @count is zero, returns zero and does nothing. A value of @count
* larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
*
* On success, the number of bytes read into the buffer is returned.
* It is not an error if this is not the same as the requested size, as it
* can happen e.g. near the end of a file. Zero is returned on end of file
* (or if @count is zero), but never otherwise.
*
* 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.
*
* For the asynchronous, non-blocking, version of this function, see
* g_buffered_input_stream_fill_async().
*
* Returns: the number of bytes read into @stream's buffer, up to @count,
* or -1 on error.
**/
gssize
g_buffered_input_stream_fill (GBufferedInputStream *stream,
gssize count,
GCancellable *cancellable,
GError **error)
{
GBufferedInputStreamClass *class;
GInputStream *input_stream;
gssize res;
g_return_val_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream), -1);
input_stream = G_INPUT_STREAM (stream);
if (g_input_stream_is_closed (input_stream))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
_("Stream is already closed"));
return -1;
}
if (g_input_stream_has_pending (input_stream))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PENDING,
_("Stream has outstanding operation"));
return -1;
}
g_input_stream_set_pending (input_stream, TRUE);
if (cancellable)
g_push_current_cancellable (cancellable);
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
res = class->fill (stream, count, cancellable, error);
if (cancellable)
g_pop_current_cancellable (cancellable);
g_input_stream_set_pending (input_stream, FALSE);
return res;
}
static void
async_fill_callback_wrapper (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GBufferedInputStream *stream = G_BUFFERED_INPUT_STREAM (source_object);
g_input_stream_set_pending (G_INPUT_STREAM (stream), FALSE);
(*stream->priv->outstanding_callback) (source_object, res, user_data);
g_object_unref (stream);
}
/**
* g_buffered_input_stream_fill_async:
* @stream: #GBufferedInputStream.
* @count: a #gssize.
* @io_priority: the <link linkend="io-priority">I/O priority</link>
* of the request.
* @cancellable: optional #GCancellable object
* @callback: a #GAsyncReadyCallback.
* @user_data: 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().
**/
void
g_buffered_input_stream_fill_async (GBufferedInputStream *stream,
gssize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GBufferedInputStreamClass *class;
GSimpleAsyncResult *simple;
g_return_if_fail (G_IS_BUFFERED_INPUT_STREAM (stream));
if (count == 0)
{
simple = g_simple_async_result_new (G_OBJECT (stream),
callback,
user_data,
g_buffered_input_stream_fill_async);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
return;
}
if (((gssize) count) < 0)
{
g_simple_async_report_error_in_idle (G_OBJECT (stream),
callback,
user_data,
G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
_("Too large count value passed to g_input_stream_read_async"));
return;
}
if (g_input_stream_is_closed (G_INPUT_STREAM (stream)))
{
g_simple_async_report_error_in_idle (G_OBJECT (stream),
callback,
user_data,
G_IO_ERROR, G_IO_ERROR_CLOSED,
_("Stream is already closed"));
return;
}
if (g_input_stream_has_pending (G_INPUT_STREAM (stream)))
{
g_simple_async_report_error_in_idle (G_OBJECT (stream),
callback,
user_data,
G_IO_ERROR, G_IO_ERROR_PENDING,
_("Stream has outstanding operation"));
return;
}
class = G_BUFFERED_INPUT_STREAM_GET_CLASS (stream);
g_input_stream_set_pending (G_INPUT_STREAM (stream), TRUE);
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)
{
GSimpleAsyncResult *simple;
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_IS_SIMPLE_ASYNC_RESULT (result))
{
simple = G_SIMPLE_ASYNC_RESULT (result);
if (g_simple_async_result_propagate_error (simple, error))
return -1;
/* Special case read of 0 bytes */
if (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_fill_async)
return 0;
}
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: 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: 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: 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;
g_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 (count, priv->len - in_buffer);
/* If requested length does not fit at end, compact */
if (priv->len - priv->end < 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;
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;
}
g_input_stream_set_pending (stream, FALSE); /* to avoid already pending error */
nread = g_buffered_input_stream_fill (bstream, priv->len, cancellable, error);
g_input_stream_set_pending (stream, TRUE); /* enable again */
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;
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 availbile 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;
}
g_input_stream_set_pending (stream, FALSE); /* to avoid already pending error */
nread = g_buffered_input_stream_fill (bstream, priv->len, cancellable, error);
g_input_stream_set_pending (stream, TRUE); /* enable again */
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;
}
/**
* g_buffered_input_stream_read_byte:
* @stream: #GBufferedInputStream.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occuring, 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;
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 (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
_("Stream is already closed"));
return -1;
}
if (g_input_stream_has_pending (input_stream))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PENDING,
_("Stream has outstanding operation"));
return -1;
}
available = priv->end - priv->pos;
if (available < 1)
return priv->buffer[priv->pos++];
/* Byte not available, request refill for more */
if (cancellable)
g_push_current_cancellable (cancellable);
priv->pos = 0;
priv->end = 0;
nread = g_buffered_input_stream_fill (stream, priv->len, cancellable, error);
if (cancellable)
g_pop_current_cancellable (cancellable);
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;
GSimpleAsyncResult *simple;
simple = user_data;
error = NULL;
res = g_input_stream_read_finish (G_INPUT_STREAM (source_object),
result, &error);
g_simple_async_result_set_op_res_gssize (simple, res);
if (res == -1)
{
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
}
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
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;
GSimpleAsyncResult *simple;
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 (count, priv->len - in_buffer);
/* If requested length does not fit at end, compact */
if (priv->len - priv->end < count)
compact_buffer (stream);
simple = g_simple_async_result_new (G_OBJECT (stream),
callback, user_data,
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,
simple);
}
static gssize
g_buffered_input_stream_real_fill_finish (GBufferedInputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
gssize nread;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_assert (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_real_fill_async);
nread = g_simple_async_result_get_op_res_gssize (simple);
return nread;
}
typedef struct {
gssize bytes_read;
gssize count;
void *buffer;
} ReadAsyncData;
static void
free_read_async_data (gpointer _data)
{
ReadAsyncData *data = _data;
g_slice_free (ReadAsyncData, data);
}
static void
large_read_callback (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
ReadAsyncData *data;
GError *error;
gssize nread;
data = g_simple_async_result_get_op_res_gpointer (simple);
error = NULL;
nread = g_input_stream_read_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_read == 0)
g_simple_async_result_set_from_error (simple, error);
if (nread > 0)
data->bytes_read += nread;
if (error)
g_error_free (error);
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
static void
read_fill_buffer_callback (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
GBufferedInputStream *bstream;
GBufferedInputStreamPrivate *priv;
ReadAsyncData *data;
GError *error;
gssize nread;
gsize available;
bstream = G_BUFFERED_INPUT_STREAM (source_object);
priv = bstream->priv;
g_input_stream_set_pending (G_INPUT_STREAM (bstream), TRUE); /* enable again */
data = g_simple_async_result_get_op_res_gpointer (simple);
error = NULL;
nread = g_buffered_input_stream_fill_finish (bstream,
result, &error);
if (nread < 0 && data->bytes_read == 0)
g_simple_async_result_set_from_error (simple, error);
if (nread > 0)
{
available = priv->end - priv->pos;
data->count = MIN (data->count, available);
memcpy ((char *)data->buffer + data->bytes_read, (char *)priv->buffer + priv->pos, data->count);
data->bytes_read += data->count;
priv->pos += data->count;
}
if (error)
g_error_free (error);
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
static void
g_buffered_input_stream_read_async (GInputStream *stream,
void *buffer,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GBufferedInputStream *bstream;
GBufferedInputStreamPrivate *priv;
GInputStream *base_stream;
gsize available;
GSimpleAsyncResult *simple;
ReadAsyncData *data;
bstream = G_BUFFERED_INPUT_STREAM (stream);
priv = bstream->priv;
data = g_slice_new (ReadAsyncData);
data->buffer = buffer;
data->bytes_read = 0;
simple = g_simple_async_result_new (G_OBJECT (stream),
callback, user_data,
g_buffered_input_stream_read_async);
g_simple_async_result_set_op_res_gpointer (simple, data, free_read_async_data);
available = priv->end - priv->pos;
if (count <= available)
{
memcpy (buffer, priv->buffer + priv->pos, count);
priv->pos += count;
data->bytes_read = count;
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
return;
}
/* Full request not available, read all currently availbile and request refill for more */
memcpy (buffer, priv->buffer + priv->pos, available);
priv->pos = 0;
priv->end = 0;
count -= available;
data->bytes_read = available;
data->count = count;
if (count > priv->len)
{
/* Large request, shortcut buffer */
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
g_input_stream_read_async (base_stream,
(char *)buffer + data->bytes_read,
count,
io_priority, cancellable,
large_read_callback,
simple);
}
else
{
g_input_stream_set_pending (stream, FALSE); /* to avoid already pending error */
g_buffered_input_stream_fill_async (bstream, priv->len,
io_priority, cancellable,
read_fill_buffer_callback, simple);
}
}
static gssize
g_buffered_input_stream_read_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
ReadAsyncData *data;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_assert (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_read_async);
data = g_simple_async_result_get_op_res_gpointer (simple);
return data->bytes_read;
}
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)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
SkipAsyncData *data;
GError *error;
gssize nread;
data = g_simple_async_result_get_op_res_gpointer (simple);
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_simple_async_result_set_from_error (simple, error);
if (nread > 0)
data->bytes_skipped += nread;
if (error)
g_error_free (error);
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
static void
skip_fill_buffer_callback (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
GBufferedInputStream *bstream;
GBufferedInputStreamPrivate *priv;
SkipAsyncData *data;
GError *error;
gssize nread;
gsize available;
bstream = G_BUFFERED_INPUT_STREAM (source_object);
priv = bstream->priv;
g_input_stream_set_pending (G_INPUT_STREAM (bstream), TRUE); /* enable again */
data = g_simple_async_result_get_op_res_gpointer (simple);
error = NULL;
nread = g_buffered_input_stream_fill_finish (bstream,
result, &error);
if (nread < 0 && data->bytes_skipped == 0)
g_simple_async_result_set_from_error (simple, error);
if (nread > 0)
{
available = priv->end - priv->pos;
data->count = MIN (data->count, available);
data->bytes_skipped += data->count;
priv->pos += data->count;
}
if (error)
g_error_free (error);
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
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;
GInputStream *base_stream;
gsize available;
GSimpleAsyncResult *simple;
SkipAsyncData *data;
bstream = G_BUFFERED_INPUT_STREAM (stream);
priv = bstream->priv;
data = g_slice_new (SkipAsyncData);
data->bytes_skipped = 0;
simple = g_simple_async_result_new (G_OBJECT (stream),
callback, user_data,
g_buffered_input_stream_skip_async);
g_simple_async_result_set_op_res_gpointer (simple, data, free_skip_async_data);
available = priv->end - priv->pos;
if (count <= available)
{
priv->pos += count;
data->bytes_skipped = count;
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
return;
}
/* Full request not available, skip all currently availbile 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,
simple);
}
else
{
g_input_stream_set_pending (stream, FALSE); /* to avoid already pending error */
g_buffered_input_stream_fill_async (bstream, priv->len,
io_priority, cancellable,
skip_fill_buffer_callback, simple);
}
}
static gssize
g_buffered_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
SkipAsyncData *data;
simple = G_SIMPLE_ASYNC_RESULT (result);
g_assert (g_simple_async_result_get_source_tag (simple) == g_buffered_input_stream_skip_async);
data = g_simple_async_result_get_op_res_gpointer (simple);
return data->bytes_skipped;
}
#define __G_BUFFERED_INPUT_STREAM_C__
#include "gioaliasdef.c"
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