/* 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(); }