From 3ac2abb0b5f84819abe6feea9d7b883b40369610 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Mon, 13 Dec 2010 21:32:35 +0200
Subject: commit before content-tile separation

---
 src/serialization.cpp | 182 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 177 insertions(+), 5 deletions(-)

(limited to 'src/serialization.cpp')

diff --git a/src/serialization.cpp b/src/serialization.cpp
index 57db2b40f..eb80f3c60 100644
--- a/src/serialization.cpp
+++ b/src/serialization.cpp
@@ -17,18 +17,184 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-/*
-(c) 2010 Perttu Ahola <celeron55@gmail.com>
-*/
-
 #include "serialization.h"
 #include "utility.h"
+#include "zlib.h"
+
+/* report a zlib or i/o error */
+void zerr(int ret)
+{   
+    fputs("zerr: ", stderr);
+    switch (ret) {
+    case Z_ERRNO:
+        if (ferror(stdin))
+            fputs("error reading stdin\n", stderr);
+        if (ferror(stdout))
+            fputs("error writing stdout\n", stderr);
+        break;
+    case Z_STREAM_ERROR:
+        fputs("invalid compression level\n", stderr);
+        break;
+    case Z_DATA_ERROR:
+        fputs("invalid or incomplete deflate data\n", stderr);
+        break;
+    case Z_MEM_ERROR:
+        fputs("out of memory\n", stderr);
+        break;
+    case Z_VERSION_ERROR:
+        fputs("zlib version mismatch!\n", stderr);
+		break;
+	default:
+		dstream<<"return value = "<<ret<<"\n";
+    }
+}
+
+void compressZlib(SharedBuffer<u8> data, std::ostream &os)
+{
+	z_stream z;
+	const s32 bufsize = 16384;
+	//char input_buffer[bufsize];
+	char output_buffer[bufsize];
+	int input_i = 0;
+	int status = 0;
+	int ret;
+
+	z.zalloc = Z_NULL;
+	z.zfree = Z_NULL;
+	z.opaque = Z_NULL;
+
+	ret = deflateInit(&z, -1);
+	if(ret != Z_OK)
+		throw SerializationError("compressZlib: deflateInit failed");
+	
+	z.avail_in = 0;
+	
+	for(;;)
+	{
+		int flush = Z_NO_FLUSH;
+		z.next_out = (Bytef*)output_buffer;
+		z.avail_out = bufsize;
+
+		if(z.avail_in == 0)
+		{
+			//z.next_in = (char*)&data[input_i];
+			z.next_in = (Bytef*)&data[input_i];
+			z.avail_in = data.getSize() - input_i;
+			input_i += z.avail_in;
+			if(input_i == (int)data.getSize())
+				flush = Z_FINISH;
+		}
+		if(z.avail_in == 0)
+			break;
+		status = deflate(&z, flush);
+		if(status == Z_NEED_DICT || status == Z_DATA_ERROR
+				|| status == Z_MEM_ERROR)
+		{
+			zerr(status);
+			throw SerializationError("compressZlib: deflate failed");
+		}
+		int count = bufsize - z.avail_out;
+		if(count)
+			os.write(output_buffer, count);
+	}
+
+	deflateEnd(&z);
+
+}
+
+void decompressZlib(std::istream &is, std::ostream &os)
+{
+	z_stream z;
+	const s32 bufsize = 16384;
+	char input_buffer[bufsize];
+	char output_buffer[bufsize];
+	int status = 0;
+	int ret;
+	int bytes_read = 0;
+	int input_buffer_len = 0;
+
+	z.zalloc = Z_NULL;
+	z.zfree = Z_NULL;
+	z.opaque = Z_NULL;
+
+	ret = inflateInit(&z);
+	if(ret != Z_OK)
+		throw SerializationError("compressZlib: inflateInit failed");
+	
+	z.avail_in = 0;
+	
+	//dstream<<"initial fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
+
+	for(;;)
+	{
+		z.next_out = (Bytef*)output_buffer;
+		z.avail_out = bufsize;
+
+		if(z.avail_in == 0)
+		{
+			z.next_in = (Bytef*)input_buffer;
+			input_buffer_len = is.readsome(input_buffer, bufsize);
+			z.avail_in = input_buffer_len;
+			//dstream<<"read fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
+		}
+		if(z.avail_in == 0)
+		{
+			//dstream<<"z.avail_in == 0"<<std::endl;
+			break;
+		}
+			
+		//dstream<<"1 z.avail_in="<<z.avail_in<<std::endl;
+		status = inflate(&z, Z_NO_FLUSH);
+		//dstream<<"2 z.avail_in="<<z.avail_in<<std::endl;
+		bytes_read += is.gcount() - z.avail_in;
+		//dstream<<"bytes_read="<<bytes_read<<std::endl;
+
+		if(status == Z_NEED_DICT || status == Z_DATA_ERROR
+				|| status == Z_MEM_ERROR)
+		{
+			zerr(status);
+			throw SerializationError("compressZlib: inflate failed");
+		}
+		int count = bufsize - z.avail_out;
+		//dstream<<"count="<<count<<std::endl;
+		if(count)
+			os.write(output_buffer, count);
+		if(status == Z_STREAM_END)
+		{
+			//dstream<<"Z_STREAM_END"<<std::endl;
+			
+			//dstream<<"z.avail_in="<<z.avail_in<<std::endl;
+			//dstream<<"fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
+			// Unget all the data that inflate didn't take
+			for(u32 i=0; i < z.avail_in; i++)
+			{
+				is.unget();
+				if(is.fail() || is.bad())
+				{
+					dstream<<"unget #"<<i<<" failed"<<std::endl;
+					dstream<<"fail="<<is.fail()<<" bad="<<is.bad()<<std::endl;
+					throw SerializationError("compressZlib: unget failed");
+				}
+			}
+			
+			break;
+		}
+	}
+
+	inflateEnd(&z);
+}
 
 void compress(SharedBuffer<u8> data, std::ostream &os, u8 version)
 {
-	if(data.getSize() == 0)
+	if(version >= 11)
+	{
+		compressZlib(data, os);
 		return;
+	}
 
+	if(data.getSize() == 0)
+		return;
+	
 	// Write length (u32)
 
 	u8 tmp[4];
@@ -63,6 +229,12 @@ void compress(SharedBuffer<u8> data, std::ostream &os, u8 version)
 
 void decompress(std::istream &is, std::ostream &os, u8 version)
 {
+	if(version >= 11)
+	{
+		decompressZlib(is, os);
+		return;
+	}
+
 	// Read length (u32)
 
 	u8 tmp[4];
-- 
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