114 lines
3.1 KiB
C#
114 lines
3.1 KiB
C#
using System;
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using System.ComponentModel;
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using NLua;
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namespace BizHawk.Client.Common
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{
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[Description("A library for performing standard bitwise operations.")]
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public sealed class BitLuaLibrary : LuaLibraryBase
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{
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public BitLuaLibrary(Lua lua)
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: base(lua) { }
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public BitLuaLibrary(Lua lua, Action<string> logOutputCallback)
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: base(lua, logOutputCallback) { }
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public override string Name => "bit";
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[LuaMethod("band", "Bitwise AND of 'val' against 'amt'")]
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public static uint Band(uint val, uint amt)
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{
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return val & amt;
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}
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[LuaMethod("bnot", "Bitwise NOT of 'val' against 'amt'")]
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public static uint Bnot(uint val)
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{
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return ~val;
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}
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[LuaMethod("bor", "Bitwise OR of 'val' against 'amt'")]
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public static uint Bor(uint val, uint amt)
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{
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return val | amt;
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}
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[LuaMethod("bxor", "Bitwise XOR of 'val' against 'amt'")]
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public static uint Bxor(uint val, uint amt)
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{
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return val ^ amt;
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}
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[LuaMethod("lshift", "Logical shift left of 'val' by 'amt' bits")]
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public static uint Lshift(uint val, int amt)
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{
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return val << amt;
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}
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[LuaMethod("rol", "Left rotate 'val' by 'amt' bits")]
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public static uint Rol(uint val, int amt)
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{
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return (val << amt) | (val >> (32 - amt));
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}
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[LuaMethod("ror", "Right rotate 'val' by 'amt' bits")]
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public static uint Ror(uint val, int amt)
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{
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return (val >> amt) | (val << (32 - amt));
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}
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[LuaMethod("rshift", "Logical shift right of 'val' by 'amt' bits")]
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public static uint Rshift(uint val, int amt)
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{
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return (uint)(val >> amt);
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}
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[LuaMethod("arshift", "Arithmetic shift right of 'val' by 'amt' bits")]
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public static int Arshift(int val, int amt)
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{
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return val >> amt;
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}
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[LuaMethod("check", "Returns result of bit 'pos' being set in 'num'")]
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public static bool Check(long num, int pos)
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{
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return (num & (1 << pos)) != 0;
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}
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[LuaMethod("set", "Sets the bit 'pos' in 'num'")]
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public static uint Set(uint num, int pos)
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{
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return (uint)(num | (uint)1 << pos);
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}
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[LuaMethod("clear", "Clears the bit 'pos' in 'num'")]
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public static long Clear(uint num, int pos)
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{
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return num & ~(1 << pos);
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}
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[LuaMethod("byteswap_16", "Byte swaps 'short', i.e. bit.byteswap_16(0xFF00) would return 0x00FF")]
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public static ushort Byteswap16(ushort val)
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{
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return (ushort)((val & 0xFFU) << 8 | (val & 0xFF00U) >> 8);
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}
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[LuaMethod("byteswap_32", "Byte swaps 'dword'")]
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public static uint Byteswap32(uint val)
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{
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return (val & 0x000000FFU) << 24 | (val & 0x0000FF00U) << 8 |
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(val & 0x00FF0000U) >> 8 | (val & 0xFF000000U) >> 24;
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}
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[LuaMethod("byteswap_64", "Byte swaps 'long'")]
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public static ulong Byteswap64(ulong val)
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{
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return (val & 0x00000000000000FFUL) << 56 | (val & 0x000000000000FF00UL) << 40 |
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(val & 0x0000000000FF0000UL) << 24 | (val & 0x00000000FF000000UL) << 8 |
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(val & 0x000000FF00000000UL) >> 8 | (val & 0x0000FF0000000000UL) >> 24 |
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(val & 0x00FF000000000000UL) >> 40 | (val & 0xFF00000000000000UL) >> 56;
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}
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}
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}
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