File pidgin-nonblock-common.patch of Package pidgin.6596

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File pidgin-nonblock-common.patch of Package pidgin.6596

--- a/libpurple/plugins/ssl/ssl-gnutls.c
+++ b/libpurple/plugins/ssl/ssl-gnutls.c
@@ -435,8 +435,6 @@ ssl_gnutls_close(PurpleSslConnection *gs
 	if (gnutls_data->handshake_timer)
 		purple_timeout_remove(gnutls_data->handshake_timer);
 
-	gnutls_bye(gnutls_data->session, GNUTLS_SHUT_RDWR);
-
 	gnutls_deinit(gnutls_data->session);
 
 	g_free(gnutls_data);
@@ -524,6 +522,22 @@ ssl_gnutls_read(PurpleSslConnection *gsc
 }
 
 static size_t
+ssl_gnutls_read_nonblock(PurpleSslConnection *gsc, void *data, size_t len)
+{
+	PurpleSslGnutlsData *gnutls_data = PURPLE_SSL_GNUTLS_DATA(gsc);
+	int s;
+
+	s = gnutls_record_recv(gnutls_data->session, data, len);
+
+	if (s == GNUTLS_E_AGAIN)
+		s = PURPLE_SSL_IO_AGAIN;
+	else if (s == GNUTLS_E_INTERRUPTED)
+		s = PURPLE_SSL_IO_INTERRUPTED;
+
+	return s;
+}
+
+static size_t
 ssl_gnutls_write(PurpleSslConnection *gsc, const void *data, size_t len)
 {
 	PurpleSslGnutlsData *gnutls_data = PURPLE_SSL_GNUTLS_DATA(gsc);
@@ -1296,6 +1310,23 @@ static PurpleCertificateScheme x509_gnut
 	x509_compare_pubkeys,            /* Compare public keys */
 };
 
+static size_t
+ssl_gnutls_write_nonblock(PurpleSslConnection *gsc, const void *data, size_t len)
+{
+	PurpleSslGnutlsData *gnutls_data = PURPLE_SSL_GNUTLS_DATA(gsc);
+	size_t s = 0;
+
+	if(gnutls_data)
+		s = gnutls_record_send(gnutls_data->session, data, len);
+
+	if (s == GNUTLS_E_AGAIN)
+		s = PURPLE_SSL_IO_AGAIN;
+	else if (s == GNUTLS_E_INTERRUPTED)
+		s = PURPLE_SSL_IO_INTERRUPTED;
+
+	return s;
+}
+
 static PurpleSslOps ssl_ops =
 {
 	ssl_gnutls_init,
@@ -1303,7 +1334,9 @@ static PurpleSslOps ssl_ops =
 	ssl_gnutls_connect,
 	ssl_gnutls_close,
 	ssl_gnutls_read,
+    ssl_gnutls_read_nonblock,
 	ssl_gnutls_write,
+    ssl_gnutls_write_nonblock,
 	ssl_gnutls_get_peer_certificates,
 
 	/* padding */
--- a/libpurple/plugins/ssl/ssl-nss.c
+++ b/libpurple/plugins/ssl/ssl-nss.c
@@ -1235,6 +1235,8 @@ static PurpleSslOps ssl_ops =
 	ssl_nss_connect,
 	ssl_nss_close,
 	ssl_nss_read,
+	ssl_nss_read,
+	ssl_nss_write,
 	ssl_nss_write,
 	ssl_nss_peer_certs,
 
--- /dev/null
+++ b/libpurple/purple-fifo.c
@@ -0,0 +1,232 @@
+/*
+ * @file purple-fifo.c  A FIFO byte queue.
+ * @ingroup core
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "internal.h"
+
+#define BUFFER_SIZE 256
+
+typedef struct
+{
+	GList *buffer_list;
+	GList *enqueue_buffer;
+	gint   enqueue_pos;
+	GList *dequeue_buffer;
+	gint   dequeue_pos;
+
+	gint   total_used;
+}
+PurpleFifo;
+
+PurpleFifo *
+purple_fifo_new (void)
+{
+	return g_new0 (PurpleFifo, 1);
+}
+
+void
+purple_fifo_destroy (PurpleFifo *fifo)
+{
+	GList *l;
+
+	for (l = fifo->buffer_list; l; l = g_list_next (l))
+		g_free (l->data);
+
+	g_list_free (fifo->buffer_list);
+}
+
+gint
+purple_fifo_get_used (PurpleFifo *fifo)
+{
+	return fifo->total_used;
+}
+
+static void
+ensure_buffers (PurpleFifo *fifo)
+{
+	if (!fifo->buffer_list)
+	{
+		fifo->buffer_list = g_list_append (NULL, g_malloc (BUFFER_SIZE));
+		fifo->enqueue_buffer = fifo->buffer_list;
+		fifo->dequeue_buffer = fifo->buffer_list;
+
+		fifo->buffer_list->data = g_malloc (BUFFER_SIZE);
+	}
+}
+
+static void
+enqueue_next_buffer (PurpleFifo *fifo)
+{
+	g_list_append (fifo->enqueue_buffer, g_malloc (BUFFER_SIZE));
+	fifo->enqueue_buffer = g_list_next (fifo->enqueue_buffer);
+	fifo->enqueue_pos = 0;
+}
+
+static void
+dequeue_next_buffer (PurpleFifo *fifo)
+{
+	g_free (fifo->dequeue_buffer->data);
+	fifo->dequeue_buffer = g_list_delete_link (fifo->dequeue_buffer, fifo->dequeue_buffer);
+
+	fifo->buffer_list = fifo->dequeue_buffer;
+	if (!fifo->buffer_list)
+		fifo->enqueue_buffer = NULL;
+
+	fifo->dequeue_pos = 0;
+}
+
+void
+purple_fifo_enqueue (PurpleFifo *fifo, gconstpointer libpurple, gint n)
+{
+	gint in_pos;
+
+	ensure_buffers (fifo);
+
+	for (in_pos = 0; in_pos < n; )
+	{
+		gint n_copied = MIN (BUFFER_SIZE - fifo->enqueue_pos, n - in_pos);
+
+		memcpy (((guint8 *) fifo->enqueue_buffer->data) + fifo->enqueue_pos, ((const guint8 *) libpurple) + in_pos, n_copied);
+
+		fifo->enqueue_pos += n_copied;
+		in_pos            += n_copied;
+
+		if (fifo->enqueue_pos == BUFFER_SIZE)
+			enqueue_next_buffer (fifo);
+	}
+
+	fifo->total_used += n;
+}
+
+gboolean
+purple_fifo_dequeue (PurpleFifo *fifo, gpointer dest, gint n)
+{
+	gint out_pos;
+
+	if (n > fifo->total_used)
+		return FALSE;
+
+	for (out_pos = 0; out_pos < n; )
+	{
+		gint n_copied = MIN (BUFFER_SIZE - fifo->dequeue_pos, n - out_pos);
+
+		if (dest)
+			memcpy (((guint8 *) dest) + out_pos,
+				((guint8 *) fifo->dequeue_buffer->data) + fifo->dequeue_pos,
+				n_copied);
+
+		fifo->dequeue_pos += n_copied;
+		out_pos           += n_copied;
+
+		if (fifo->dequeue_pos == BUFFER_SIZE)
+			dequeue_next_buffer (fifo);
+	}
+
+	fifo->total_used -= n;
+	return TRUE;
+}
+
+gboolean
+purple_fifo_dequeue_line (PurpleFifo *fifo, gchar **dest)
+{
+	gchar    *line;
+	gboolean  have_cr   = FALSE;
+	gboolean  have_crlf = FALSE;
+	GList    *buffer_l;
+	gint      pos;
+	gint      n;
+
+	buffer_l = fifo->dequeue_buffer;
+	n = 0;
+
+	for (pos = fifo->dequeue_pos; n < fifo->total_used && !have_crlf; pos++, n++)
+	{
+		guint8 *p = ((guint8 *) buffer_l->data) + fifo->dequeue_pos;
+		guint8  c = *p;
+
+		if (c == '\r')
+		{
+			have_cr   = TRUE;
+			have_crlf = FALSE;
+		}
+		else if (c == '\n' && have_cr)
+		{
+			have_crlf = TRUE;
+		}
+
+		if (pos == BUFFER_SIZE)
+		{
+			buffer_l = g_list_next (buffer_l);
+			pos = 0;
+		}
+	}
+
+	if (!have_crlf)
+		return FALSE;
+
+	line = g_malloc (n + 1);
+	if (!purple_fifo_dequeue (fifo, line, n))
+	{
+		/* Paranoid check; can't happen in practice */
+		g_free (line);
+		return FALSE;
+	}
+
+	*(line + n) = '\0';
+	*dest = line;
+
+	return TRUE;
+}
+
+gboolean
+purple_fifo_peek (PurpleFifo *fifo, gpointer dest, gint n)
+{
+	GList *dequeue_buffer;
+	gint   dequeue_pos;
+	gint   out_pos;
+
+	if (n > fifo->total_used)
+		return FALSE;
+
+	dequeue_buffer = fifo->dequeue_buffer;
+	dequeue_pos    = fifo->dequeue_pos;
+
+	for (out_pos = 0; out_pos < n; )
+	{
+		gint n_copied = MIN (BUFFER_SIZE - dequeue_pos, n - out_pos);
+
+		if (dest)
+			memcpy (((guint8 *) dest) + out_pos,
+				((guint8 *) dequeue_buffer->data) + dequeue_pos,
+				n_copied);
+
+		dequeue_pos += n_copied;
+		out_pos     += n_copied;
+
+		if (dequeue_pos == BUFFER_SIZE)
+		{
+			dequeue_buffer = g_list_next (dequeue_buffer);
+			dequeue_pos    = 0;
+		}
+	}
+
+	return TRUE;
+}
--- /dev/null
+++ b/libpurple/purple-fifo.h
@@ -0,0 +1,54 @@
+/**
+ * @file purple-fifo.h  A FIFO byte queue.
+ * @ingroup core
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _purple_fifo_H_
+#define _purple_fifo_H_
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef struct
+{
+	GList *buffer_list;
+	GList *enqueue_buffer;
+	gint   enqueue_pos;
+	GList *dequeue_buffer;
+	gint   dequeue_pos;
+}
+PurpleFifo;
+
+PurpleFifo *purple_fifo_new          (void);
+void      purple_fifo_destroy      (PurpleFifo *fifo);
+
+gint      purple_fifo_get_used     (PurpleFifo *fifo);
+
+void      purple_fifo_enqueue      (PurpleFifo *fifo, gconstpointer libpurple, gint n);
+gboolean  purple_fifo_dequeue      (PurpleFifo *fifo, gpointer dest, gint n);
+gboolean  purple_fifo_dequeue_line (PurpleFifo *fifo, gchar **dest);
+
+gboolean  purple_fifo_peek         (PurpleFifo *fifo, gpointer dest, gint n);
+
+G_END_DECLS
+
+#endif /* _purple_fifo_H_ */
--- /dev/null
+++ b/libpurple/purple-io.c
@@ -0,0 +1,391 @@
+/*
+ * @file purple-io.c  Buffering I/O layer.
+ * @ingroup core
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "internal.h"
+#include "eventloop.h"
+#include "purple-io.h"
+
+#define OPERATION_MAX_BYTES 4096
+#define WRITE_LOW_WATER     512
+
+static void update_watches (PurpleIO *io);
+
+static gboolean
+can_read (PurpleIO *io)
+{
+	fd_set rfds;
+	struct timeval tv;
+	int retval;
+
+	FD_ZERO(&rfds);
+	FD_SET(io->fd, &rfds);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = 1;
+
+	retval = select (io->fd + 1, &rfds, NULL, NULL, &tv);
+
+	return retval ? TRUE : FALSE;
+}
+
+static gint
+try_read (PurpleIO *io, gint max_read, gint *read_errno)
+{
+	guint8 buf [OPERATION_MAX_BYTES];
+	glong  flags;
+	gint   n_read;
+
+	/* Do a non-blocking read */
+	flags = fcntl (io->fd, F_GETFL);
+	fcntl (io->fd, F_SETFL, flags | O_NONBLOCK);
+
+	if (io->gsc) {
+		n_read = purple_ssl_read_nonblock (io->gsc, buf, MIN (max_read, OPERATION_MAX_BYTES));
+
+		if (read_errno) {
+			if (n_read == PURPLE_SSL_IO_AGAIN)
+				*read_errno = EAGAIN;
+			else if (n_read == PURPLE_SSL_IO_INTERRUPTED)
+				*read_errno = EINTR;
+			else
+				*read_errno = 0;
+		}
+
+		if (n_read < 0)
+			n_read = 0;
+ 	} else {
+		n_read = read (io->fd, buf, MIN (max_read, OPERATION_MAX_BYTES));
+		if (read_errno)
+			*read_errno = errno;
+	}
+
+	fcntl (io->fd, F_SETFL, flags);
+
+	if (n_read > 0) {
+		/* Got some data */
+		purple_fifo_enqueue (io->read_fifo, buf, n_read);
+	}
+
+	return n_read;
+}
+
+static void
+read_nonblock (PurpleIO *io, gint max_read)
+{
+	gint read_errno;
+
+	if (io->got_eof)
+		return;
+
+	if (max_read <= purple_fifo_get_used (io->read_fifo))
+		return;
+
+	max_read -= purple_fifo_get_used (io->read_fifo);
+
+	if (can_read (io) && try_read (io, max_read, &read_errno) < 1 && read_errno != EINTR)
+	{
+		/* Disconnected */
+		io->got_eof = TRUE;
+		update_watches (io);
+
+		if (io->eof_func)
+			io->eof_func (io, io->eof_func_data);
+	}
+}
+
+static void
+read_cb (gpointer data, gint source, PurpleInputCondition condition)
+{
+	PurpleIO *io = data;
+	gint    n_read;
+	gint    read_errno;
+
+	n_read = try_read (io, OPERATION_MAX_BYTES, &read_errno);
+
+	/* If interrupted by signal, just retry later */
+	if (n_read < 0 && read_errno == EINTR)
+		return;
+
+	/* If we got 0 bytes or an error that's not EINTR, the connection was closed */
+	if (n_read < 1) {
+		io->got_eof = TRUE;
+		update_watches (io);
+
+		if (io->eof_func)
+			io->eof_func (io, io->eof_func_data);
+
+		return;
+	}
+
+	if (io->read_func)
+		io->read_func (io, io->read_func_data);
+
+	update_watches (io);
+}
+
+static void
+write_cb (gpointer data, gint source, PurpleInputCondition condition)
+{
+	PurpleIO *io = data;
+	guint8  buf [OPERATION_MAX_BYTES];
+	gint    n_written;
+	glong   flags;
+
+	n_written = purple_fifo_get_used (io->write_fifo);
+	n_written = MIN (OPERATION_MAX_BYTES, n_written);
+
+	/* Paranoid: Shouldn't happen */
+	if (n_written < 1)
+		return;
+
+	purple_fifo_peek (io->write_fifo, buf, n_written);
+
+	flags = fcntl (io->fd, F_GETFL);
+	fcntl (io->fd, F_SETFL, flags | O_NONBLOCK);
+
+	if (io->gsc) {
+		n_written = purple_ssl_write_nonblock (io->gsc, buf, n_written);
+ 	} else {
+		n_written = write (io->fd, buf, n_written);
+	}
+
+	fcntl (io->fd, F_SETFL, flags);
+
+	if (n_written < 0)
+		io->got_eof = TRUE;
+
+	if (n_written < 1)
+		return;
+
+	/* Drop written data from buffer */
+	purple_fifo_dequeue (io->write_fifo, NULL, n_written);
+
+	if (io->flushed_func &&
+	    purple_fifo_get_used (io->write_fifo) == 0)
+		io->flushed_func (io, io->flushed_func_data);
+
+	if (io->write_func &&
+	    purple_fifo_get_used (io->write_fifo) < WRITE_LOW_WATER)
+		io->write_func (io, io->write_func_data);
+
+	update_watches (io);
+}
+
+static void
+update_watches (PurpleIO *io)
+{
+	gboolean want_read_watch  = FALSE;
+	gboolean want_write_watch = FALSE;
+
+	if (!io->got_eof) {
+		if (io->read_func)
+			want_read_watch = TRUE;
+
+		if (purple_fifo_get_used (io->write_fifo))
+			want_write_watch = TRUE;
+	}
+
+	if (want_read_watch && !io->read_watch_id) {
+		io->read_watch_id = purple_input_add (io->fd, PURPLE_INPUT_READ, read_cb, io);
+	} else if (!want_read_watch && io->read_watch_id) {
+		purple_input_remove (io->read_watch_id);
+		io->read_watch_id = 0;
+	}
+
+	if (want_write_watch && !io->write_watch_id) {
+		io->write_watch_id = purple_input_add (io->fd, PURPLE_INPUT_WRITE, write_cb, io);
+	} else if (!want_write_watch && io->write_watch_id) {
+		purple_input_remove (io->write_watch_id);
+		io->write_watch_id = 0;
+	}
+}
+
+PurpleIO *
+purple_io_new (gint fd)
+{
+	PurpleIO *io;
+
+	io = g_new0 (PurpleIO, 1);
+
+	io->fd         = fd;
+	io->read_fifo  = purple_fifo_new ();
+	io->write_fifo = purple_fifo_new ();
+
+	return io;
+}
+
+PurpleIO *
+purple_io_new_ssl (PurpleSslConnection *gsc)
+{
+	PurpleIO *io;
+
+	io = g_new0 (PurpleIO, 1);
+
+	io->gsc        = gsc;
+	io->fd         = gsc->fd;
+	io->read_fifo  = purple_fifo_new ();
+	io->write_fifo = purple_fifo_new ();
+
+	return io;
+}
+
+void
+purple_io_destroy (PurpleIO *io)
+{
+#if 0
+	if (purple_fifo_get_used (io->write_fifo) > 0)
+		g_print ("Throwing away outbound data!\n");
+#endif
+
+	if (io->read_watch_id)
+		purple_input_remove (io->read_watch_id);
+	if (io->write_watch_id)
+		purple_input_remove (io->write_watch_id);
+
+	purple_fifo_destroy (io->read_fifo);
+	purple_fifo_destroy (io->write_fifo);
+
+	if (io->gsc)
+		purple_ssl_close (io->gsc);
+	else
+		close (io->fd);
+
+	g_free (io);
+}
+
+gint
+purple_io_get_fd (PurpleIO *io)
+{
+	return io->fd;
+}
+
+PurpleSslConnection *
+purple_io_get_ssl_connection (PurpleIO *io)
+{
+	return io->gsc;
+}
+
+gboolean
+purple_io_is_connected (PurpleIO *io)
+{
+	return !io->got_eof;
+}
+
+void
+purple_io_set_read_func (PurpleIO *io, PurpleIOFunc func, gpointer data)
+{
+	io->read_func      = func;
+	io->read_func_data = data;
+
+	update_watches (io);
+}
+
+void
+purple_io_set_write_func (PurpleIO *io, PurpleIOFunc func, gpointer data)
+{
+	io->write_func      = func;
+	io->write_func_data = data;
+
+	update_watches (io);
+}
+
+void
+purple_io_set_eof_func (PurpleIO *io, PurpleIOFunc func, gpointer data)
+{
+	io->eof_func      = func;
+	io->eof_func_data = data;
+
+	update_watches (io);
+}
+
+void
+purple_io_set_flushed_func (PurpleIO *io, PurpleIOFunc func, gpointer data)
+{
+	io->flushed_func      = func;
+	io->flushed_func_data = data;
+
+	update_watches (io);
+}
+
+gboolean
+purple_io_write_bytes (PurpleIO *io, gconstpointer libpurple, gint n_bytes)
+{
+	if (io->got_eof)
+		return FALSE;
+
+	purple_fifo_enqueue (io->write_fifo, libpurple, n_bytes);
+
+	update_watches (io);
+	return TRUE;
+}
+
+gboolean
+purple_io_write_line (PurpleIO *io, const gchar *line)
+{
+	if (io->got_eof)
+		return FALSE;
+
+	purple_fifo_enqueue (io->write_fifo, line, strlen (line));
+	purple_fifo_enqueue (io->write_fifo, "\r\n", 2);
+
+	update_watches (io);
+	return TRUE;
+}
+
+gboolean
+purple_io_read_bytes (PurpleIO *io, gpointer dest, gint n_bytes)
+{
+	gboolean result;
+
+	read_nonblock (io, n_bytes);
+
+	result = purple_fifo_dequeue (io->read_fifo, dest, n_bytes);
+
+	update_watches (io);
+	return result;
+}
+
+gboolean
+purple_io_read_line (PurpleIO *io, gchar **line)
+{
+	gboolean result;
+
+	read_nonblock (io, 65536);
+
+	result = purple_fifo_dequeue_line (io->read_fifo, line);
+
+	update_watches (io);
+	return result;
+}
+
+gint
+purple_io_get_pending_read (PurpleIO *io)
+{
+	return purple_fifo_get_used (io->read_fifo);
+}
+
+gint
+purple_io_get_pending_write (PurpleIO *io)
+{
+	return purple_fifo_get_used (io->write_fifo);
+}
--- /dev/null
+++ b/libpurple/purple-io.h
@@ -0,0 +1,87 @@
+/**
+ * @file purple-io.h  Buffering I/O layer.
+ * @ingroup core
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _PURPLE_IO_H_
+#define _PURPLE_IO_H_
+
+#include "purple-fifo.h"
+#include "sslconn.h"
+
+G_BEGIN_DECLS
+
+typedef struct PurpleIO PurpleIO;
+
+typedef void (*PurpleIOFunc) (PurpleIO *io, gpointer data);
+
+struct PurpleIO
+{
+	gint               fd;
+	PurpleSslConnection *gsc;
+
+	guint              got_eof : 1;
+
+	PurpleFifo          *read_fifo;
+	PurpleFifo          *write_fifo;
+
+	guint              read_watch_id;
+	guint              write_watch_id;
+
+	/* Callback invoked when input buffer grows */
+	PurpleIOFunc         read_func;
+	gpointer           read_func_data;
+
+	/* Callback invoked when output buffer shrinks (sufficiently) */
+	PurpleIOFunc         write_func;
+	gpointer           write_func_data;
+
+	/* Callback invoked when connection drops */
+	PurpleIOFunc         eof_func;
+	gpointer           eof_func_data;
+
+	/* Callback invoked when output buffer empty */
+	PurpleIOFunc         flushed_func;
+	gpointer           flushed_func_data;
+};
+
+PurpleIO            *purple_io_new                (gint fd);
+PurpleIO            *purple_io_new_ssl            (PurpleSslConnection *gsc);
+void               purple_io_destroy            (PurpleIO *io);
+
+gint               purple_io_get_fd             (PurpleIO *io);
+PurpleSslConnection *purple_io_get_ssl_connection (PurpleIO *io);
+gboolean           purple_io_is_connected       (PurpleIO *io);
+
+void               purple_io_set_read_func      (PurpleIO *io, PurpleIOFunc func, gpointer data);
+void               purple_io_set_write_func     (PurpleIO *io, PurpleIOFunc func, gpointer data);
+void               purple_io_set_eof_func       (PurpleIO *io, PurpleIOFunc func, gpointer data);
+void               purple_io_set_flushed_func   (PurpleIO *io, PurpleIOFunc func, gpointer data);
+
+gboolean           purple_io_write_bytes        (PurpleIO *io, gconstpointer libpurple, gint n_bytes);
+gboolean           purple_io_write_line         (PurpleIO *io, const gchar *line);
+
+gboolean           purple_io_read_bytes         (PurpleIO *io, gpointer dest, gint n_bytes);
+gboolean           purple_io_read_line          (PurpleIO *io, gchar **line);
+
+G_END_DECLS
+
+#endif /* _PURPLE_IO_H_ */
--- a/libpurple/sslconn.c
+++ b/libpurple/sslconn.c
@@ -273,6 +273,27 @@ purple_ssl_read(PurpleSslConnection *gsc
 }
 
 size_t
+purple_ssl_read_nonblock(PurpleSslConnection *gsc, void *data, size_t len)
+{
+	PurpleSslOps *ops;
+
+	g_return_val_if_fail(gsc  != NULL, 0);
+	g_return_val_if_fail(data != NULL, 0);
+	g_return_val_if_fail(len  >  0,    0);
+
+	ops = purple_ssl_get_ops();
+
+	if (ops != NULL) {
+		if (ops->read_nonblock != NULL)
+			return (ops->read_nonblock)(gsc, data, len);
+		else if (ops->read != NULL)
+			return (ops->read)(gsc, data, len);
+	}
+
+	return 0;
+}
+
+size_t
 purple_ssl_write(PurpleSslConnection *gsc, const void *data, size_t len)
 {
 	PurpleSslOps *ops;
@@ -296,6 +317,27 @@ purple_ssl_get_peer_certificates(PurpleS
 	return (ops->get_peer_certificates)(gsc);
 }
 
+size_t
+purple_ssl_write_nonblock(PurpleSslConnection *gsc, const void *data, size_t len)
+{
+	PurpleSslOps *ops;
+
+	g_return_val_if_fail(gsc  != NULL, 0);
+	g_return_val_if_fail(data != NULL, 0);
+	g_return_val_if_fail(len  >  0,    0);
+
+	ops = purple_ssl_get_ops();
+
+	if (ops != NULL) {
+		if (ops->write_nonblock != NULL)
+			return (ops->write_nonblock)(gsc, data, len);
+		else if (ops->write != NULL)
+			return (ops->write)(gsc, data, len);
+	}
+
+	return 0;
+}
+
 void
 purple_ssl_set_ops(PurpleSslOps *ops)
 {
--- a/libpurple/sslconn.h
+++ b/libpurple/sslconn.h
@@ -34,6 +34,12 @@ typedef enum
 	PURPLE_SSL_CERTIFICATE_INVALID = 3
 } PurpleSslErrorType;
 
+typedef enum
+{
+	PURPLE_SSL_IO_INTERRUPTED = -1,
+	PURPLE_SSL_IO_AGAIN = -2
+} PurpleSslIOErrorType;
+
 #include "certificate.h"
 #include "proxy.h"
 
@@ -115,6 +121,7 @@ typedef struct
 	 * @see purple_ssl_read
 	*/
 	size_t (*read)(PurpleSslConnection *gsc, void *data, size_t len);
+	size_t (*read_nonblock)(PurpleSslConnection *gsc, void *data, size_t len);
 	/** Writes data to a connection (like POSIX send())
 	* @param gsc    Connection context
 	* @param data   Data buffer to send data from
@@ -124,6 +131,7 @@ typedef struct
 	* @see purple_ssl_write
 	*/
 	size_t (*write)(PurpleSslConnection *gsc, const void *data, size_t len);
+    size_t (*write_nonblock)(PurpleSslConnection *gsc, const void *data, size_t len);
 	/** Obtains the certificate chain provided by the peer
 	 *
 	 * @param gsc   Connection context
@@ -281,6 +289,17 @@ void purple_ssl_close(PurpleSslConnectio
 size_t purple_ssl_read(PurpleSslConnection *gsc, void *buffer, size_t len);
 
 /**
+ * Reads data from an SSL connection without blocking.
+ *
+ * @param gsc    The SSL connection handle.
+ * @param buffer The destination buffer.
+ * @param len    The maximum number of bytes to read.
+ *
+ * @return The number of bytes read.
+ */
+size_t purple_ssl_read_nonblock(PurpleSslConnection *gsc, void *buffer, size_t len);
+
+/**
  * Writes data to an SSL connection.
  *
  * @param gsc    The SSL connection handle.
@@ -303,6 +322,17 @@ size_t purple_ssl_write(PurpleSslConnect
  */
 GList * purple_ssl_get_peer_certificates(PurpleSslConnection *gsc);
 
+/**
+ * Writes data to an SSL connection without blocking.
+ *
+ * @param gsc    The SSL connection handle.
+ * @param buffer The buffer to write.
+ * @param len    The length of the data to write.
+ *
+ * @return The number of bytes written.
+ */
+size_t purple_ssl_write_nonblock(PurpleSslConnection *gsc, const void *buffer, size_t len);
+
 /*@}*/
 
 /**************************************************************************/

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File pidgin-nonblock-common.patch of Package pidgin.6596

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