Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/src/lib/iostream-proxy.c b/src/lib/iostream-proxy.c
new file mode 100644
index 0000000..2663420
--- /dev/null
+++ b/src/lib/iostream-proxy.c
@@ -0,0 +1,173 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file
+ */
+#include "lib.h"
+#include "buffer.h"
+#include "str.h"
+#include "iostream-pump.h"
+#include "iostream-proxy.h"
+#include <unistd.h>
+
+#undef iostream_proxy_set_completion_callback
+
+struct iostream_proxy {
+	struct iostream_pump *ltr;
+	struct iostream_pump *rtl;
+
+	unsigned int ref;
+
+	iostream_proxy_callback_t *callback;
+	void *context;
+};
+
+static void
+iostream_proxy_completion(struct iostream_proxy *proxy,
+			  enum iostream_proxy_side side,
+			  enum iostream_pump_status pump_status)
+{
+	enum iostream_proxy_status status;
+
+	switch (pump_status) {
+	case IOSTREAM_PUMP_STATUS_INPUT_EOF:
+		status = IOSTREAM_PROXY_STATUS_INPUT_EOF;
+		break;
+	case IOSTREAM_PUMP_STATUS_INPUT_ERROR:
+		status = IOSTREAM_PROXY_STATUS_INPUT_ERROR;
+		break;
+	case IOSTREAM_PUMP_STATUS_OUTPUT_ERROR:
+		status = IOSTREAM_PROXY_STATUS_OTHER_SIDE_OUTPUT_ERROR;
+		break;
+	default:
+		i_unreached();
+	}
+	proxy->callback(side, status, proxy->context);
+}
+
+static
+void iostream_proxy_rtl_completion(enum iostream_pump_status status,
+				   struct iostream_proxy *proxy)
+{
+	iostream_proxy_completion(proxy, IOSTREAM_PROXY_SIDE_RIGHT, status);
+}
+
+static
+void iostream_proxy_ltr_completion(enum iostream_pump_status status,
+				   struct iostream_proxy *proxy)
+{
+	iostream_proxy_completion(proxy, IOSTREAM_PROXY_SIDE_LEFT, status);
+}
+
+struct iostream_proxy *
+iostream_proxy_create(struct istream *left_input, struct ostream *left_output,
+		      struct istream *right_input, struct ostream *right_output)
+{
+	i_assert(left_input != NULL &&
+		 right_input != NULL &&
+		 left_output != NULL &&
+		 right_output != NULL);
+
+	/* create proxy */
+	struct iostream_proxy *proxy = i_new(struct iostream_proxy, 1);
+
+	proxy->ltr = iostream_pump_create(left_input, right_output);
+	proxy->rtl = iostream_pump_create(right_input, left_output);
+
+	iostream_pump_set_completion_callback(proxy->ltr, iostream_proxy_ltr_completion, proxy);
+	iostream_pump_set_completion_callback(proxy->rtl, iostream_proxy_rtl_completion, proxy);
+
+	proxy->ref = 1;
+
+	return proxy;
+}
+
+void iostream_proxy_start(struct iostream_proxy *proxy)
+{
+	i_assert(proxy != NULL);
+	i_assert(proxy->callback != NULL);
+
+	iostream_pump_start(proxy->rtl);
+	iostream_pump_start(proxy->ltr);
+}
+
+void iostream_proxy_set_completion_callback(struct iostream_proxy *proxy,
+					    iostream_proxy_callback_t *callback,
+					    void *context)
+{
+	i_assert(proxy != NULL);
+
+	proxy->callback = callback;
+	proxy->context = context;
+}
+
+struct istream *iostream_proxy_get_istream(struct iostream_proxy *proxy, enum iostream_proxy_side side)
+{
+	i_assert(proxy != NULL);
+
+	switch(side) {
+	case IOSTREAM_PROXY_SIDE_LEFT: return iostream_pump_get_input(proxy->ltr);
+	case IOSTREAM_PROXY_SIDE_RIGHT: return iostream_pump_get_input(proxy->rtl);
+	default: i_unreached();
+	}
+}
+
+struct ostream *iostream_proxy_get_ostream(struct iostream_proxy *proxy, enum iostream_proxy_side side)
+{
+	i_assert(proxy != NULL);
+
+	switch(side) {
+	case IOSTREAM_PROXY_SIDE_LEFT: return iostream_pump_get_output(proxy->ltr);
+	case IOSTREAM_PROXY_SIDE_RIGHT: return iostream_pump_get_output(proxy->rtl);
+	default: i_unreached();
+	}
+}
+
+void iostream_proxy_ref(struct iostream_proxy *proxy)
+{
+	i_assert(proxy != NULL && proxy->ref > 0);
+	proxy->ref++;
+}
+
+void iostream_proxy_unref(struct iostream_proxy **proxy_r)
+{
+	struct iostream_proxy *proxy;
+
+	if (proxy_r == NULL || *proxy_r == NULL)
+		return;
+
+	proxy = *proxy_r;
+	*proxy_r = NULL;
+
+	i_assert(proxy->ref > 0);
+	if (--proxy->ref == 0) {
+		/* pumps will call stop internally
+		   if refcount drops to 0 */
+		iostream_pump_unref(&proxy->ltr);
+		iostream_pump_unref(&proxy->rtl);
+		i_free(proxy);
+	}
+}
+
+void iostream_proxy_stop(struct iostream_proxy *proxy)
+{
+	i_assert(proxy != NULL);
+	iostream_pump_stop(proxy->ltr);
+	iostream_pump_stop(proxy->rtl);
+}
+
+bool iostream_proxy_is_waiting_output(struct iostream_proxy *proxy,
+				      enum iostream_proxy_side side)
+{
+	switch (side) {
+	case IOSTREAM_PROXY_SIDE_LEFT:
+		return iostream_pump_is_waiting_output(proxy->ltr);
+	case IOSTREAM_PROXY_SIDE_RIGHT:
+		return iostream_pump_is_waiting_output(proxy->rtl);
+	}
+	i_unreached();
+}
+
+void iostream_proxy_switch_ioloop(struct iostream_proxy *proxy)
+{
+	i_assert(proxy != NULL);
+	iostream_pump_switch_ioloop(proxy->ltr);
+	iostream_pump_switch_ioloop(proxy->rtl);
+}