Who needs LZ4 compression in their network code?

Compression should be done before you pipe it over the network, not leaving it up to the ENET library to do that for you.

Source/Native/enet.h

@@ -830,10 +830,6 @@ extern "C" {
 extern "C" {
 #endif
 
-#ifdef ENET_LZ4
-	#include "lz4/lz4.h"
-#endif
-
 #ifdef __MINGW32__
 	#include "mingw/inet_ntop.c"
 	#include "mingw/inet_pton.c"
@@ -2392,20 +2388,6 @@ extern "C" {
 				return 0;
 		}
 
-		#ifdef ENET_LZ4
-			if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) {
-				size_t originalSize = LZ4_decompress_safe((const char*)host->receivedData + headerSize, (char*)host->packetData[1] + headerSize, host->receivedDataLength - headerSize, sizeof(host->packetData[1]) - headerSize);
-
-				if (originalSize <= 0 || originalSize > sizeof(host->packetData[1]) - headerSize)
-					return 0;
-
-				memcpy(host->packetData[1], header, headerSize);
-
-				host->receivedData = host->packetData[1];
-				host->receivedDataLength = headerSize + originalSize;
-			}
-		#endif
-
 		if (host->checksumCallback != NULL) {
 			enet_uint32* checksum = (enet_uint32*)&host->receivedData[headerSize - sizeof(enet_uint32)];
 			enet_uint32 desiredChecksum = *checksum;
@@ -2901,10 +2883,6 @@ extern "C" {
 		int sentLength;
 		host->continueSending = 1;
 
-		#ifdef ENET_LZ4
-			size_t shouldCompress = 0;
-		#endif
-
 		while (host->continueSending) {
 			for (host->continueSending = 0, currentPeer = host->peers; currentPeer < &host->peers[host->peerCount]; ++currentPeer) {
 				if (currentPeer->state == ENET_PEER_STATE_DISCONNECTED || currentPeer->state == ENET_PEER_STATE_ZOMBIE)
@@ -2978,44 +2956,6 @@ extern "C" {
 					host->buffers->dataLength = (size_t)&((ENetProtocolHeader*)0)->sentTime;
 				}
 
-				#ifdef ENET_LZ4
-					if (host->compression == 1 && host->packetSize > 64) {
-						size_t originalSize = host->packetSize - sizeof(ENetProtocolHeader), compressedSize = 0;
-						const ENetBuffer* buffers = &host->buffers[1];
-
-						if (host->compressionBufferSize < originalSize) {
-							enet_free(host->compressionBuffer);
-
-							host->compressionBuffer = (char*)enet_malloc(originalSize);
-							host->compressionBufferSize = originalSize;
-						}
-
-						size_t totalSize = originalSize, dataSize = 0;
-
-						while (totalSize) {
-							size_t i;
-
-							for (i = 0; i < host->bufferCount - 1; i++) {
-								size_t copySize = ENET_MIN(totalSize, buffers[i].dataLength);
-
-								memcpy(host->compressionBuffer + dataSize, buffers[i].data, copySize);
-
-								totalSize -= copySize;
-								dataSize += copySize;
-							}
-						}
-
-						compressedSize = LZ4_compress_default((const char*)host->compressionBuffer, (char*)host->packetData[1], dataSize, originalSize);
-
-						if (compressedSize > 0 && compressedSize < originalSize) {
-							host->headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED;
-							shouldCompress = compressedSize;
-
-							ENET_LOG_TRACE("peer %u: compressed %u->%u (%u%%)\n", currentPeer->incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize);
-						}
-					}
-				#endif
-
 				if (currentPeer->outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID)
 					host->headerFlags |= currentPeer->outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT;
 
@@ -3028,14 +2968,6 @@ extern "C" {
 					*checksum = host->checksumCallback(host->buffers, host->bufferCount);
 				}
 
-				#ifdef ENET_LZ4
-					if (shouldCompress > 0) {
-						host->buffers[1].data = host->packetData[1];
-						host->buffers[1].dataLength = shouldCompress;
-						host->bufferCount = 2;
-					}
-				#endif
-
 				currentPeer->lastSendTime = host->serviceTime;
 				sentLength = enet_socket_send(host->socket, &currentPeer->address, host->buffers, host->bufferCount);