commit b8fd0ed6d85ecf09d927c6551d1e233f41bd68ab
from: Omar Polo <op@omarpolo.com>
date: Mon Sep 13 15:47:10 2021 UTC

send received page in chunks

imsg can't handle buffer "too big" (around INT16_MAX) and solene@
capsule index is ~29K.  The 4K chunk size is completely arbitrary.

commit - 7b0be57c7cb536303ba948e71fcd81f40f85f0c3
commit + b8fd0ed6d85ecf09d927c6551d1e233f41bd68ab
blob - 88b9b979998d210062fdde5d8e9507772e1a56d3
blob + 6d8e0e4e3262ab70488c88ff0cdbc9e1f647b5a8
--- net.c
+++ net.c
@@ -541,7 +541,7 @@ net_read(struct bufferevent *bev, void *d)
 	struct req	*req = d;
 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
 	void		*data;
-	size_t		 len;
+	size_t		 len, chunk;
 	int		 r;
 	char		*header;
 
@@ -562,8 +562,19 @@ net_read(struct bufferevent *bev, void *d)
 	if ((len = EVBUFFER_LENGTH(src)) == 0)
 		return;
 	data = EVBUFFER_DATA(src);
-	net_send_ui(IMSG_BUF, req->id, data, len);
-	evbuffer_drain(src, len);
+
+	/*
+	 * Split data into chunks before sending.  imsg can't handle
+	 * message that are "too big".
+	 */
+	while (len != 0) {
+		chunk = MIN(len, 4096);
+		net_send_ui(IMSG_BUF, req->id, data, chunk);
+		data += chunk;
+		len -= chunk;
+	}
+
+	evbuffer_drain(src, EVBUFFER_LENGTH(src));
 	return;
 
 err: