From 7a1b8a0fefe9a2a0fae6289195e2936ec9c17000 Mon Sep 17 00:00:00 2001
From: cbdev <cb@cbcdn.com>
Date: Thu, 20 Jun 2019 15:23:45 +0200
Subject: Implement fixedlength framing

---
 plugins/framing_fixedlength.c  | 36 ++++++++++++++++++++++++++++++++++++
 plugins/framing_fixedlength.md |  9 +++++++++
 plugins/makefile               |  5 ++++-
 3 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 plugins/framing_fixedlength.c
 create mode 100644 plugins/framing_fixedlength.md

(limited to 'plugins')

diff --git a/plugins/framing_fixedlength.c b/plugins/framing_fixedlength.c
new file mode 100644
index 0000000..1a66df4
--- /dev/null
+++ b/plugins/framing_fixedlength.c
@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+#include "../websocksy.h"
+
+static int64_t framing_fixedlen(uint8_t* data, size_t length, size_t last_read, ws_operation* opcode, void** framing_data, const char* config){
+	size_t* frame_size = framing_data ? (size_t*) (*framing_data) : NULL;
+
+	if(data && !frame_size){
+		frame_size = calloc(1, sizeof(size_t));
+		if(!frame_size){
+			fprintf(stderr, "Failed to allocate memory\n");
+			return -1;
+		}
+
+		*frame_size = strtoul(config, NULL, 0);
+		*framing_data = frame_size;
+	}
+	else if(!data && frame_size){
+		free(*framing_data);
+		*framing_data = NULL;
+	}
+
+	if(!(*frame_size)){
+		return length;
+	}
+
+	if(length >= *frame_size){
+		return *frame_size;
+	}
+
+	return 0;
+}
+
+static void __attribute__((constructor)) init(){
+	core_register_framing("fixedlength", framing_fixedlen);
+}
diff --git a/plugins/framing_fixedlength.md b/plugins/framing_fixedlength.md
new file mode 100644
index 0000000..bd095c4
--- /dev/null
+++ b/plugins/framing_fixedlength.md
@@ -0,0 +1,9 @@
+# The `fixedlength` framing function
+
+The `fixedlength` peer stream framing function segments the peer stream into binary frames
+at fixed byte boundaries (for example, aggregating and then sending 32-byte fragments from the
+peer stream).
+
+## Configuration
+
+The framing configuration string is simply the length of the segments to transmit in bytes.
diff --git a/plugins/makefile b/plugins/makefile
index 1a6ef36..feab4cd 100644
--- a/plugins/makefile
+++ b/plugins/makefile
@@ -1,5 +1,5 @@
 .PHONY: all clean
-PLUGINS = backend_file.so
+PLUGINS = backend_file.so framing_fixedlength.so
 
 CFLAGS += -fPIC -g -I../
 LDFLAGS += -shared
@@ -7,6 +7,9 @@ LDFLAGS += -shared
 %.so :: %.c %.h
 	$(CC) $(CFLAGS) $(LDLIBS) $< -o $@ $(LDFLAGS)
 
+%.so :: %.c
+	$(CC) $(CFLAGS) $(LDLIBS) $< -o $@ $(LDFLAGS)
+
 all: $(PLUGINS)
 
 clean:
-- 
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