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/*
* Copyright (C) 2010 Xavier Claessens <xclaesse@gmail.com>
* Copyright (C) 2010 Collabora Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "common.h"
typedef struct
{
GIOStream *stream1;
GIOStream *stream2;
_GIOStreamSpliceFlags flags;
gint io_priority;
GCancellable *cancellable;
gulong cancelled_id;
GCancellable *op1_cancellable;
GCancellable *op2_cancellable;
guint completed;
GError *error;
} SpliceContext;
static void
splice_context_free (SpliceContext *ctx)
{
g_object_unref (ctx->stream1);
g_object_unref (ctx->stream2);
if (ctx->cancellable != NULL)
g_object_unref (ctx->cancellable);
g_object_unref (ctx->op1_cancellable);
g_object_unref (ctx->op2_cancellable);
g_clear_error (&ctx->error);
g_slice_free (SpliceContext, ctx);
}
static void
splice_complete (GSimpleAsyncResult *simple,
SpliceContext *ctx)
{
if (ctx->cancelled_id != 0)
g_cancellable_disconnect (ctx->cancellable, ctx->cancelled_id);
ctx->cancelled_id = 0;
if (ctx->error != NULL)
g_simple_async_result_set_from_error (simple, ctx->error);
g_simple_async_result_complete (simple);
}
static void
splice_close_cb (GObject *iostream,
GAsyncResult *res,
gpointer user_data)
{
GSimpleAsyncResult *simple = user_data;
SpliceContext *ctx;
GError *error = NULL;
g_io_stream_close_finish (G_IO_STREAM (iostream), res, &error);
ctx = g_simple_async_result_get_op_res_gpointer (simple);
ctx->completed++;
/* Keep the first error that occured */
if (error != NULL && ctx->error == NULL)
ctx->error = error;
else
g_clear_error (&error);
/* If all operations are done, complete now */
if (ctx->completed == 4)
splice_complete (simple, ctx);
g_object_unref (simple);
}
static void
splice_cb (GObject *ostream,
GAsyncResult *res,
gpointer user_data)
{
GSimpleAsyncResult *simple = user_data;
SpliceContext *ctx;
GError *error = NULL;
g_output_stream_splice_finish (G_OUTPUT_STREAM (ostream), res, &error);
ctx = g_simple_async_result_get_op_res_gpointer (simple);
ctx->completed++;
/* ignore cancellation error if it was not requested by the user */
if (error != NULL &&
g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED) &&
(ctx->cancellable == NULL ||
!g_cancellable_is_cancelled (ctx->cancellable)))
g_clear_error (&error);
/* Keep the first error that occured */
if (error != NULL && ctx->error == NULL)
ctx->error = error;
else
g_clear_error (&error);
if (ctx->completed == 1 &&
(ctx->flags & _G_IO_STREAM_SPLICE_WAIT_FOR_BOTH) == 0)
{
/* We don't want to wait for the 2nd operation to finish, cancel it */
g_cancellable_cancel (ctx->op1_cancellable);
g_cancellable_cancel (ctx->op2_cancellable);
}
else if (ctx->completed == 2)
{
if (ctx->cancellable == NULL ||
!g_cancellable_is_cancelled (ctx->cancellable))
{
g_cancellable_reset (ctx->op1_cancellable);
g_cancellable_reset (ctx->op2_cancellable);
}
/* Close the IO streams if needed */
if ((ctx->flags & _G_IO_STREAM_SPLICE_CLOSE_STREAM1) != 0)
g_io_stream_close_async (ctx->stream1, ctx->io_priority,
ctx->op1_cancellable, splice_close_cb, g_object_ref (simple));
else
ctx->completed++;
if ((ctx->flags & _G_IO_STREAM_SPLICE_CLOSE_STREAM2) != 0)
g_io_stream_close_async (ctx->stream2, ctx->io_priority,
ctx->op2_cancellable, splice_close_cb, g_object_ref (simple));
else
ctx->completed++;
/* If all operations are done, complete now */
if (ctx->completed == 4)
splice_complete (simple, ctx);
}
g_object_unref (simple);
}
static void
splice_cancelled_cb (GCancellable *cancellable,
GSimpleAsyncResult *simple)
{
SpliceContext *ctx;
ctx = g_simple_async_result_get_op_res_gpointer (simple);
g_cancellable_cancel (ctx->op1_cancellable);
g_cancellable_cancel (ctx->op2_cancellable);
}
void
_g_io_stream_splice_async (GIOStream *stream1,
GIOStream *stream2,
_GIOStreamSpliceFlags flags,
gint io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *simple;
SpliceContext *ctx;
GInputStream *istream;
GOutputStream *ostream;
if (cancellable != NULL && g_cancellable_is_cancelled (cancellable))
{
g_simple_async_report_error_in_idle (NULL, callback,
user_data, G_IO_ERROR, G_IO_ERROR_CANCELLED,
"Operation has been cancelled");
return;
}
ctx = g_slice_new0 (SpliceContext);
ctx->stream1 = g_object_ref (stream1);
ctx->stream2 = g_object_ref (stream2);
ctx->flags = flags;
ctx->io_priority = io_priority;
ctx->op1_cancellable = g_cancellable_new ();
ctx->op2_cancellable = g_cancellable_new ();
ctx->completed = 0;
simple = g_simple_async_result_new (NULL, callback, user_data,
_g_io_stream_splice_finish);
g_simple_async_result_set_op_res_gpointer (simple, ctx,
(GDestroyNotify) splice_context_free);
if (cancellable != NULL)
{
ctx->cancellable = g_object_ref (cancellable);
ctx->cancelled_id = g_cancellable_connect (cancellable,
G_CALLBACK (splice_cancelled_cb), g_object_ref (simple),
g_object_unref);
}
istream = g_io_stream_get_input_stream (stream1);
ostream = g_io_stream_get_output_stream (stream2);
g_output_stream_splice_async (ostream, istream, G_OUTPUT_STREAM_SPLICE_NONE,
io_priority, ctx->op1_cancellable, splice_cb,
g_object_ref (simple));
istream = g_io_stream_get_input_stream (stream2);
ostream = g_io_stream_get_output_stream (stream1);
g_output_stream_splice_async (ostream, istream, G_OUTPUT_STREAM_SPLICE_NONE,
io_priority, ctx->op2_cancellable, splice_cb,
g_object_ref (simple));
g_object_unref (simple);
}
gboolean
_g_io_stream_splice_finish (GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple;
g_return_val_if_fail (G_IS_SIMPLE_ASYNC_RESULT (result), FALSE);
simple = G_SIMPLE_ASYNC_RESULT (result);
if (g_simple_async_result_propagate_error (simple, error))
return FALSE;
g_return_val_if_fail (g_simple_async_result_is_valid (result, NULL,
_g_io_stream_splice_finish), FALSE);
return TRUE;
}
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