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/*
Minetest
Copyright (C) 2010-2013 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 "pointer.h"
#include "../exceptions.h"
#include <sstream>
#include <iomanip>
// Creates a string with the length as the first two bytes
std::string serializeString(const std::string &plain)
{
//assert(plain.size() <= 65535);
if(plain.size() > 65535)
throw SerializationError("String too long for serializeString");
char buf[2];
writeU16((u8*)&buf[0], plain.size());
std::string s;
s.append(buf, 2);
s.append(plain);
return s;
}
// Creates a string with the length as the first two bytes from wide string
std::string serializeWideString(const std::wstring &plain)
{
//assert(plain.size() <= 65535);
if(plain.size() > 65535)
throw SerializationError("String too long for serializeString");
char buf[2];
writeU16((u8*)buf, plain.size());
std::string s;
s.append(buf, 2);
for(u32 i=0; i<plain.size(); i++)
{
writeU16((u8*)buf, plain[i]);
s.append(buf, 2);
}
return s;
}
// Reads a string with the length as the first two bytes
std::string deSerializeString(std::istream &is)
{
char buf[2];
is.read(buf, 2);
if(is.gcount() != 2)
throw SerializationError("deSerializeString: size not read");
u16 s_size = readU16((u8*)buf);
if(s_size == 0)
return "";
Buffer<char> buf2(s_size);
is.read(&buf2[0], s_size);
std::string s;
s.reserve(s_size);
s.append(&buf2[0], s_size);
return s;
}
// Reads a wide string with the length as the first two bytes
std::wstring deSerializeWideString(std::istream &is)
{
char buf[2];
is.read(buf, 2);
if(is.gcount() != 2)
throw SerializationError("deSerializeString: size not read");
u16 s_size = readU16((u8*)buf);
if(s_size == 0)
return L"";
std::wstring s;
s.reserve(s_size);
for(u32 i=0; i<s_size; i++)
{
is.read(&buf[0], 2);
wchar_t c16 = readU16((u8*)buf);
s.append(&c16, 1);
}
return s;
}
// Creates a string with the length as the first four bytes
std::string serializeLongString(const std::string &plain)
{
char buf[4];
writeU32((u8*)&buf[0], plain.size());
std::string s;
s.append(buf, 4);
s.append(plain);
return s;
}
// Reads a string with the length as the first four bytes
std::string deSerializeLongString(std::istream &is)
{
char buf[4];
is.read(buf, 4);
if(is.gcount() != 4)
throw SerializationError("deSerializeLongString: size not read");
u32 s_size = readU32((u8*)buf);
if(s_size == 0)
return "";
Buffer<char> buf2(s_size);
is.read(&buf2[0], s_size);
std::string s;
s.reserve(s_size);
s.append(&buf2[0], s_size);
return s;
}
// 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();
}
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