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gio: implement GPollableInput/OutputStream in more stream types

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Implement GPollableInputStream in GMemoryInputStream and
GConverterInputStream, and likewise implement GPollableOutputStream in
the corresponding output streams.

https://bugzilla.gnome.org/show_bug.cgi?id=673997
This commit is contained in:
Dan Winship
2012-02-06 15:08:08 -05:00
parent 111ba203c2
commit 82ec4dcaed
5 changed files with 508 additions and 36 deletions
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130
gio/gconverterinputstream.c
View File

@@ -25,6 +25,7 @@
#include <string.h>
#include "gconverterinputstream.h"
#include "gpollableinputstream.h"
#include "gsimpleasyncresult.h"
#include "gcancellable.h"
#include "gioenumtypes.h"
@@ -41,6 +42,8 @@
* Converter input stream implements #GInputStream and allows
* conversion of data of various types during reading.
*
* As of GLib 2.34, #GConverterInputStream implements
* #GPollableInputStream.
**/
#define INITIAL_BUFFER_SIZE 4096
@@ -55,6 +58,7 @@ typedef struct {
struct _GConverterInputStreamPrivate {
gboolean at_input_end;
gboolean finished;
gboolean need_input;
GConverter *converter;
Buffer input_buffer;
Buffer converted_buffer;
@@ -80,9 +84,24 @@ static gssize g_converter_input_stream_read (GInputStream *stream,
GCancellable *cancellable,
GError **error);
G_DEFINE_TYPE (GConverterInputStream,
g_converter_input_stream,
G_TYPE_FILTER_INPUT_STREAM)
static gboolean g_converter_input_stream_can_poll (GPollableInputStream *stream);
static gboolean g_converter_input_stream_is_readable (GPollableInputStream *stream);
static gssize g_converter_input_stream_read_nonblocking (GPollableInputStream *stream,
void *buffer,
gsize size,
GError **error);
static GSource *g_converter_input_stream_create_source (GPollableInputStream *stream,
GCancellable *cancellable);
static void g_converter_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GConverterInputStream,
g_converter_input_stream,
G_TYPE_FILTER_INPUT_STREAM,
G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_INPUT_STREAM,
g_converter_input_stream_pollable_iface_init);
)
static void
g_converter_input_stream_class_init (GConverterInputStreamClass *klass)
@@ -112,6 +131,15 @@ g_converter_input_stream_class_init (GConverterInputStreamClass *klass)
}
static void
g_converter_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface)
{
iface->can_poll = g_converter_input_stream_can_poll;
iface->is_readable = g_converter_input_stream_is_readable;
iface->read_nonblocking = g_converter_input_stream_read_nonblocking;
iface->create_source = g_converter_input_stream_create_source;
}
static void
g_converter_input_stream_finalize (GObject *object)
{
@@ -320,6 +348,7 @@ buffer_ensure_space (Buffer *buffer,
static gssize
fill_input_buffer (GConverterInputStream *stream,
gsize at_least_size,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
@@ -332,25 +361,30 @@ fill_input_buffer (GConverterInputStream *stream,
buffer_ensure_space (&priv->input_buffer, at_least_size);
base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
nread = g_input_stream_read (base_stream,
priv->input_buffer.data + priv->input_buffer.end,
buffer_tailspace (&priv->input_buffer),
cancellable,
error);
nread = g_pollable_stream_read (base_stream,
priv->input_buffer.data + priv->input_buffer.end,
buffer_tailspace (&priv->input_buffer),
blocking,
cancellable,
error);
if (nread > 0)
priv->input_buffer.end += nread;
{
priv->input_buffer.end += nread;
priv->need_input = FALSE;
}
return nread;
}
static gssize
g_converter_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
read_internal (GInputStream *stream,
void *buffer,
gsize count,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
GConverterInputStream *cstream;
GConverterInputStreamPrivate *priv;
@@ -389,7 +423,7 @@ g_converter_input_stream_read (GInputStream *stream,
total_bytes_read == 0 &&
!priv->at_input_end)
{
nread = fill_input_buffer (cstream, count, cancellable, error);
nread = fill_input_buffer (cstream, count, blocking, cancellable, error);
if (nread < 0)
return -1;
if (nread == 0)
@@ -497,6 +531,7 @@ g_converter_input_stream_read (GInputStream *stream,
my_error2 = NULL;
nread = fill_input_buffer (cstream,
buffer_data_size (&priv->input_buffer) + 4096,
blocking,
cancellable,
&my_error2);
if (nread < 0)
@@ -504,6 +539,7 @@ g_converter_input_stream_read (GInputStream *stream,
/* Can't read any more data, return that error */
g_error_free (my_error);
g_propagate_error (error, my_error2);
priv->need_input = TRUE;
return -1;
}
else if (nread == 0)
@@ -536,6 +572,70 @@ g_converter_input_stream_read (GInputStream *stream,
g_assert_not_reached ();
}
static gssize
g_converter_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
return read_internal (stream, buffer, count, TRUE, cancellable, error);
}
static gboolean
g_converter_input_stream_can_poll (GPollableInputStream *stream)
{
GInputStream *base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
return (G_IS_POLLABLE_INPUT_STREAM (base_stream) &&
g_pollable_input_stream_can_poll (G_POLLABLE_INPUT_STREAM (base_stream)));
}
static gboolean
g_converter_input_stream_is_readable (GPollableInputStream *stream)
{
GInputStream *base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
GConverterInputStream *cstream = G_CONVERTER_INPUT_STREAM (stream);
if (buffer_data_size (&cstream->priv->converted_buffer))
return TRUE;
else if (buffer_data_size (&cstream->priv->input_buffer) &&
!cstream->priv->need_input)
return TRUE;
else
return g_pollable_input_stream_is_readable (G_POLLABLE_INPUT_STREAM (base_stream));
}
static gssize
g_converter_input_stream_read_nonblocking (GPollableInputStream *stream,
void *buffer,
gsize count,
GError **error)
{
return read_internal (G_INPUT_STREAM (stream), buffer, count,
FALSE, NULL, error);
}
static GSource *
g_converter_input_stream_create_source (GPollableInputStream *stream,
GCancellable *cancellable)
{
GInputStream *base_stream = G_FILTER_INPUT_STREAM (stream)->base_stream;
GSource *base_source, *pollable_source;
if (g_pollable_input_stream_is_readable (stream))
base_source = g_timeout_source_new (0);
else
base_source = g_pollable_input_stream_create_source (G_POLLABLE_INPUT_STREAM (base_stream), NULL);
pollable_source = g_pollable_source_new_full (stream, base_source,
cancellable);
g_source_unref (base_source);
return pollable_source;
}
/**
* g_converter_input_stream_get_converter:
* @converter_stream: a #GConverterInputStream