73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef ULTIMA8_MISC_STREAM_H
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#define ULTIMA8_MISC_STREAM_H
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#include "common/stream.h"
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namespace Ultima {
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namespace Ultima8 {
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// Read a 3-byte value, lsb first.
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inline uint32 readUint24LE(Common::ReadStream &rs) {
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uint32 val = 0;
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val |= static_cast<uint32>(rs.readByte());
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val |= static_cast<uint32>(rs.readByte() << 8);
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val |= static_cast<uint32>(rs.readByte() << 16);
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return val;
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}
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inline uint32 readX(Common::ReadStream &rs, uint32 num_bytes) {
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assert(num_bytes > 0 && num_bytes <= 4);
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if (num_bytes == 1) return rs.readByte();
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else if (num_bytes == 2) return rs.readUint16LE();
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else if (num_bytes == 3) return readUint24LE(rs);
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else return rs.readUint32LE();
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}
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inline int32 readXS(Common::ReadStream &rs, uint32 num_bytes) {
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assert(num_bytes > 0 && num_bytes <= 4);
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if (num_bytes == 1) return static_cast<int8>(rs.readByte());
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else if (num_bytes == 2) return static_cast<int16>(rs.readUint16LE());
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else if (num_bytes == 3) return (((static_cast<int32>(readUint24LE(rs))) << 8) >> 8);
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else return static_cast<int32>(rs.readUint32LE());
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}
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inline void writeUint24LE(Common::WriteStream &ws, uint32 val) {
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ws.writeByte(static_cast<byte>(val & 0xff));
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ws.writeByte(static_cast<byte>((val >> 8) & 0xff));
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ws.writeByte(static_cast<byte>((val >> 16) & 0xff));
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}
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inline void writeX(Common::WriteStream &ws, uint32 val, uint32 num_bytes) {
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assert(num_bytes > 0 && num_bytes <= 4);
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if (num_bytes == 1) ws.writeByte(static_cast<byte>(val));
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else if (num_bytes == 2) ws.writeUint16LE(static_cast<uint16>(val));
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else if (num_bytes == 3) writeUint24LE(ws, val);
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else ws.writeUint32LE(val);
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}
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} // End of namespace Ultima8
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} // End of namespace Ultima
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#endif
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