From d1624a552151bcb152b7abf63df6501b63458d78 Mon Sep 17 00:00:00 2001
From: lhofhansl <larsh@apache.org>
Date: Tue, 31 Aug 2021 17:32:31 -0700
Subject: Switch MapBlock compression to zstd (#10788)

* Add zstd support.
* Rearrange serialization order
* Compress entire mapblock

Co-authored-by: sfan5 <sfan5@live.de>
---
 src/mapnode.cpp | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

(limited to 'src/mapnode.cpp')

diff --git a/src/mapnode.cpp b/src/mapnode.cpp
index f212ea8c9..73bd620fb 100644
--- a/src/mapnode.cpp
+++ b/src/mapnode.cpp
@@ -730,9 +730,10 @@ void MapNode::deSerialize(u8 *source, u8 version)
 		}
 	}
 }
-void MapNode::serializeBulk(std::ostream &os, int version,
+
+SharedBuffer<u8> MapNode::serializeBulk(int version,
 		const MapNode *nodes, u32 nodecount,
-		u8 content_width, u8 params_width, int compression_level)
+		u8 content_width, u8 params_width)
 {
 	if (!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapNode format not supported");
@@ -746,8 +747,7 @@ void MapNode::serializeBulk(std::ostream &os, int version,
 		throw SerializationError("MapNode::serializeBulk: serialization to "
 				"version < 24 not possible");
 
-	size_t databuf_size = nodecount * (content_width + params_width);
-	u8 *databuf = new u8[databuf_size];
+	SharedBuffer<u8> databuf(nodecount * (content_width + params_width));
 
 	u32 start1 = content_width * nodecount;
 	u32 start2 = (content_width + 1) * nodecount;
@@ -758,14 +758,7 @@ void MapNode::serializeBulk(std::ostream &os, int version,
 		writeU8(&databuf[start1 + i], nodes[i].param1);
 		writeU8(&databuf[start2 + i], nodes[i].param2);
 	}
-
-	/*
-		Compress data to output stream
-	*/
-
-	compressZlib(databuf, databuf_size, os, compression_level);
-
-	delete [] databuf;
+	return databuf;
 }
 
 // Deserialize bulk node data
@@ -781,15 +774,10 @@ void MapNode::deSerializeBulk(std::istream &is, int version,
 			|| params_width != 2)
 		FATAL_ERROR("Deserialize bulk node data error");
 
-	// Uncompress or read data
-	u32 len = nodecount * (content_width + params_width);
-	std::ostringstream os(std::ios_base::binary);
-	decompressZlib(is, os);
-	std::string s = os.str();
-	if(s.size() != len)
-		throw SerializationError("deSerializeBulkNodes: "
-				"decompress resulted in invalid size");
-	const u8 *databuf = reinterpret_cast<const u8*>(s.c_str());
+	// read data
+	const u32 len = nodecount * (content_width + params_width);
+	Buffer<u8> databuf(len);
+	is.read(reinterpret_cast<char*>(*databuf), len);
 
 	// Deserialize content
 	if(content_width == 1)
-- 
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