1 /* ScummVM - Graphic Adventure Engine 2 * 3 * ScummVM is the legal property of its developers, whose names 4 * are too numerous to list here. Please refer to the COPYRIGHT 5 * file distributed with this source distribution. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef DOUBLE_SERIALIZATION_H 24 #define DOUBLE_SERIALIZATION_H 25 26 #include "common/types.h" 27 28 /** 29 * @defgroup lua_ds Double serialization 30 * @ingroup lua 31 * 32 * @brief Functions for encoding and decoding double values. 33 * 34 * @{ 35 */ 36 37 namespace Util { 38 39 struct SerializedDouble { 40 uint32 significandOne; 41 uint32 signAndSignificandTwo; 42 int16 exponent; 43 }; 44 45 struct CompactSerializedDouble { 46 uint32 signAndSignificandOne; 47 uint32 exponentAndSignificandTwo; 48 }; 49 50 /** 51 * Encodes a double as two uint32 and a one int16 52 * 53 * Supports denormalized numbers. Does NOT support NaN, or Inf 54 * 55 * @param value The value to encode 56 * @return The encoded value 57 */ 58 SerializedDouble encodeDouble(double value); 59 /** 60 * Decodes a previously encoded double 61 * 62 * @param value The value to decode 63 * @return The decoded value 64 */ 65 double decodeDouble(SerializedDouble value); 66 67 } // End of namespace Util 68 69 /** @} */ 70 71 #endif 72