From beb635c403ebf905993bfa807a7e82af9035a5ac Mon Sep 17 00:00:00 2001
From: "Tristan B. Kildaire" <deavmi@localhost.localdomain>
Date: Fri, 4 Dec 2020 17:28:29 +0200
Subject: [PATCH] Byte swap when the numbers are encoded as Big Endian on BE
 platforms, such that they are in little endian (the protocol's spec)

---
 source/bmessage.d | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/source/bmessage.d b/source/bmessage.d
index fbba8cf..299d522 100644
--- a/source/bmessage.d
+++ b/source/bmessage.d
@@ -138,10 +138,25 @@ public bool sendMessage(Socket recipient, byte[] message)
 	/* Encode the 4 byte message length header (little endian) */
 	int payloadLength = cast(int)message.length;
 	byte* lengthBytes = cast(byte*)&payloadLength;
-	messageBuffer ~= *(lengthBytes+0);
-	messageBuffer ~= *(lengthBytes+1);
-	messageBuffer ~= *(lengthBytes+2);
-	messageBuffer ~= *(lengthBytes+3);
+
+	/* On little endian simply get the bytes as is (it would be encoded as little endian) */
+	version(LittleEndian)
+	{
+		messageBuffer ~= *(lengthBytes+0);
+		messageBuffer ~= *(lengthBytes+1);
+		messageBuffer ~= *(lengthBytes+2);
+		messageBuffer ~= *(lengthBytes+3);
+	}
+
+	/* On Big Endian you must swap the big-endian-encoded number to be in little endian ordering */
+	version(BigEndian)
+	{
+		messageBuffer ~= *(lengthBytes+3);
+		messageBuffer ~= *(lengthBytes+2);
+		messageBuffer ~= *(lengthBytes+1);
+		messageBuffer ~= *(lengthBytes+0);
+	}
+	
 
 	/* Add the message to the buffer */
 	messageBuffer ~= cast(byte[])message;