Add ZLIB for Windows (#768)

Added ZLIB for Windows.  Packets for character creation are now compressed on windows before sending and ZCompression can now be used on Windows.

CMakeLists.txt

@@ -160,7 +160,6 @@ elseif (UNIX)
 	set(INCLUDED_DIRECTORIES ${INCLUDED_DIRECTORIES} "thirdparty/libbcrypt/include/bcrypt")
 endif()
 
-include_directories(${ZLIB_INCLUDE_DIRS})
 # Add binary directory as an include directory
 include_directories(${PROJECT_BINARY_DIR})
 

CMakePresets.json

@@ -118,6 +118,11 @@
 		"execution": {
 			"jobs": 2
 		},
+		"filter": {
+			"exclude": {
+				"name": "((example)|(minigzip))+"
+			}
+		},
       "output": {
         "outputOnFailure": true
       }

dCommon/CMakeLists.txt

@@ -23,5 +23,31 @@ target_link_libraries(dCommon bcrypt)
 
 if (UNIX)
 	find_package(ZLIB REQUIRED)
-	target_link_libraries(dCommon ZLIB::ZLIB)
+elseif (WIN32)
+	include(FetchContent)
+
+	# TODO Keep an eye on the zlib repository for an update to disable testing.  Don't forget to update CMakePresets
+	FetchContent_Declare(
+		zlib
+		URL https://github.com/madler/zlib/archive/refs/tags/v1.2.11.zip
+		URL_HASH MD5=9d6a627693163bbbf3f26403a3a0b0b1
+	)
+
+	# Disable warning about no project version.
+	set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
+	# Disable warning about the minimum version of cmake used for bcrypt being deprecated in the future
+	set(CMAKE_WARN_DEPRECATED OFF CACHE BOOL "" FORCE)
+
+	FetchContent_MakeAvailable(zlib)
+
+	set(ZLIB_INCLUDE_DIRS ${zlib_SOURCE_DIR} ${zlib_BINARY_DIR})
+	set_target_properties(zlib PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${ZLIB_INCLUDE_DIRS}")
+	add_library(ZLIB::ZLIB ALIAS zlib)
+else ()
+	message(
+		FATAL_ERROR
+		"This platform does not have a way to use zlib.\nCreate an issue on GitHub with your build system so it can be configured."
+	)
 endif ()
+
+target_link_libraries(dCommon ZLIB::ZLIB)

dCommon/ZCompression.cpp

@@ -1,7 +1,5 @@
 #include "ZCompression.h"
 
-#ifndef _WIN32
-
 #include <zlib.h>
 
 namespace ZCompression {
@@ -27,7 +25,6 @@ namespace ZCompression {
 		}
 		deflateEnd(&zInfo);    // zlib function
 		return(nRet);
-
 	}
 
 	int32_t Decompress(const uint8_t* abSrc, int32_t nLenSrc, uint8_t* abDst, int32_t nLenDst, int32_t& nErr) {
@@ -48,26 +45,6 @@ namespace ZCompression {
 		}
 		inflateEnd(&zInfo); // zlib function
 		return(nRet);
-
-		/*
-		z_stream zInfo = { 0 };
-		zInfo.total_in = zInfo.avail_in = nLenSrc;
-		zInfo.total_out = zInfo.avail_out = nLenDst;
-		zInfo.next_in = const_cast<Bytef*>(abSrc);
-		zInfo.next_out = const_cast<Bytef*>(abDst);
-
-		int nRet = -1;
-		nErr = inflateInit(&zInfo);               // zlib function
-		if (nErr == Z_OK) {
-			nErr = inflate(&zInfo, Z_FINISH);     // zlib function
-			if (nErr == Z_STREAM_END) {
-				nRet = zInfo.total_out;
-			}
-		}
-		inflateEnd(&zInfo);   // zlib function
-		return(nRet); // -1 or len of output
-		*/
 	}
 }
 
-#endif

dCommon/ZCompression.h

@@ -2,10 +2,6 @@
 
 #include <cstdint>
 
-#include "dPlatforms.h"
-
-#ifndef DARKFLAME_PLATFORM_WIN32
-
 namespace ZCompression {
 	int32_t GetMaxCompressedLength(int32_t nLenSrc);
 
@@ -14,4 +10,3 @@ namespace ZCompression {
 	int32_t Decompress(const uint8_t* abSrc, int32_t nLenSrc, uint8_t* abDst, int32_t nLenDst, int32_t& nErr);
 }
 
-#endif

dNet/WorldPackets.cpp

@@ -164,27 +164,35 @@ void WorldPackets::SendCreateCharacter(const SystemAddress& sysAddr, Entity* ent
 	delete name;
 	delete reputation;
 
-#ifdef _WIN32
-	bitStream.Write<uint32_t>(data.GetNumberOfBytesUsed() + 1);
-	bitStream.Write<uint8_t>(0);
-	bitStream.Write((char*)data.GetData(), data.GetNumberOfBytesUsed());
-#else
 	//Compress the data before sending:
-	const int reservedSize = 5 * 1024 * 1024;
+    const uint32_t reservedSize = ZCompression::GetMaxCompressedLength(data.GetNumberOfBytesUsed());
-	uint8_t compressedData[reservedSize];
+    uint8_t* compressedData = new uint8_t[reservedSize];
+
+	// TODO There should be better handling here for not enough memory...
+	if (!compressedData) return;
+
 	size_t size = ZCompression::Compress(data.GetData(), data.GetNumberOfBytesUsed(), compressedData, reservedSize);
 
+	assert(size <= reservedSize);
+
 	bitStream.Write<uint32_t>(size + 9); //size of data + header bytes (8)
 	bitStream.Write<uint8_t>(1);         //compressed boolean, true
 	bitStream.Write<uint32_t>(data.GetNumberOfBytesUsed());
 	bitStream.Write<uint32_t>(size);
 
+	/**
+	 * In practice, this warning serves no purpose for us.  We allocate the max memory needed on the heap
+	 * and then compress the data.  In the off chance that the compression actually increases the size,
+	 * an assertion is done to prevent bad data from being saved or sent.
+	 */
+#pragma warning(disable:6385) // C6385 Reading invalid data from 'compressedData'.
 	for (size_t i = 0; i < size; i++)
 		bitStream.Write(compressedData[i]);
-#endif
+#pragma warning(default:6385)
 
-	PacketUtils::SavePacket("chardata.bin", (const char*)bitStream.GetData(), static_cast<uint32_t>(bitStream.GetNumberOfBytesUsed()));
+	// PacketUtils::SavePacket("chardata.bin", (const char*)bitStream.GetData(), static_cast<uint32_t>(bitStream.GetNumberOfBytesUsed()));
 	SEND_PACKET;
+	delete[] compressedData;
 	Game::logger->Log("WorldPackets", "Sent CreateCharacter for ID: %llu", entity->GetObjectID());
 }