Initially split utility.h to multiple files in util/

1 files changed, 119 insertions, 0 deletions

diff --git a/src/util/serialize.cpp b/src/util/serialize.cpp
new file mode 100644
index 000000000..16825b677
--- /dev/null
+++ b/src/util/serialize.cpp
@@ -0,0 +1,119 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "serialize.h"
+
+#include <sstream>
+#include <iomanip>
+
+// Creates a string encoded in JSON format (almost equivalent to a C string literal)
+std::string serializeJsonString(const std::string &plain)
+{
+	std::ostringstream os(std::ios::binary);
+	os<<"\"";
+	for(size_t i = 0; i < plain.size(); i++)
+	{
+		char c = plain[i];
+		switch(c)
+		{
+			case '"': os<<"\\\""; break;
+			case '\\': os<<"\\\\"; break;
+			case '/': os<<"\\/"; break;
+			case '\b': os<<"\\b"; break;
+			case '\f': os<<"\\f"; break;
+			case '\n': os<<"\\n"; break;
+			case '\r': os<<"\\r"; break;
+			case '\t': os<<"\\t"; break;
+			default:
+			{
+				if(c >= 32 && c <= 126)
+				{
+					os<<c;
+				}
+				else
+				{
+					u32 cnum = (u32) (u8) c;
+					os<<"\\u"<<std::hex<<std::setw(4)<<std::setfill('0')<<cnum;
+				}
+				break;
+			}
+		}
+	}
+	os<<"\"";
+	return os.str();
+}
+
+// Reads a string encoded in JSON format
+std::string deSerializeJsonString(std::istream &is)
+{
+	std::ostringstream os(std::ios::binary);
+	char c, c2;
+
+	// Parse initial doublequote
+	is >> c;
+	if(c != '"')
+		throw SerializationError("JSON string must start with doublequote");
+
+	// Parse characters
+	for(;;)
+	{
+		c = is.get();
+		if(is.eof())
+			throw SerializationError("JSON string ended prematurely");
+		if(c == '"')
+		{
+			return os.str();
+		}
+		else if(c == '\\')
+		{
+			c2 = is.get();
+			if(is.eof())
+				throw SerializationError("JSON string ended prematurely");
+			switch(c2)
+			{
+				default:  os<<c2; break;
+				case 'b': os<<'\b'; break;
+				case 'f': os<<'\f'; break;
+				case 'n': os<<'\n'; break;
+				case 'r': os<<'\r'; break;
+				case 't': os<<'\t'; break;
+				case 'u':
+				{
+					char hexdigits[4+1];
+					is.read(hexdigits, 4);
+					if(is.eof())
+						throw SerializationError("JSON string ended prematurely");
+					hexdigits[4] = 0;
+					std::istringstream tmp_is(hexdigits, std::ios::binary);
+					int hexnumber;
+					tmp_is >> std::hex >> hexnumber;
+					os<<((char)hexnumber);
+					break;
+				}
+			}
+		}
+		else
+		{
+			os<<c;
+		}
+	}
+	return os.str();
+}
+
+