org/luaj/vm3/lib/Bit32Lib.java - minecraft/opencomputers - Rivoreo Source Code Repositories

 /*******************************************************************************
 * Copyright (c) 2012 Luaj.org. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 ******************************************************************************/
 package org.luaj.vm3.lib;

 import org.luaj.vm3.LuaTable;
 import org.luaj.vm3.LuaValue;
 import org.luaj.vm3.Varargs;

 /**
  * Subclass of LibFunction that implements the Lua standard {@code bit32} library.
  * <p>
  * Typically, this library is included as part of a call to either
  * {@link JsePlatform#standardGlobals()} or {@link JmePlatform#standardGlobals()}
  * <pre> {@code
  * Globals globals = JsePlatform.standardGlobals();
  * System.out.println( globals.get("bit32").get("bnot").call( LuaValue.valueOf(2) ) );
  * } </pre>
  * <p>
  * To instantiate and use it directly,
  * link it into your globals table via {@link LuaValue#load(LuaValue)} using code such as:
  * <pre> {@code
  * Globals globals = new Globals();
  * globals.load(new JseBaseLib());
  * globals.load(new PackageLib());
  * globals.load(new Bit32Lib());
  * System.out.println( globals.get("bit32").get("bnot").call( LuaValue.valueOf(2) ) );
  * } </pre>
  * <p>
  * This has been implemented to match as closely as possible the behavior in the corresponding library in C.
  * @see LibFunction
  * @see JsePlatform
  * @see JmePlatform
  * @see <a href="http://www.lua.org/manual/5.2/manual.html#6.7">Lua 5.2 Bitwise Operation Lib Reference</a>
  */
 public class Bit32Lib extends TwoArgFunction {

 	public Bit32Lib() {
 	}

 	public LuaValue call(LuaValue modname, LuaValue env) {
 		LuaTable t = new LuaTable();
 		bind(t, Bit32LibV.class, new String[] {
 			"band", "bnot", "bor", "btest", "bxor", "extract", "replace"
 		});
 		bind(t, Bit32Lib2.class, new String[] {
 			"arshift", "lrotate", "lshift", "rrotate", "rshift"
 		});
 		env.set("bit32", t);
 		env.get("package").get("loaded").set("bit32", t);
 		return t;
 	}

 	static final class Bit32LibV extends VarArgFunction {
 		public Varargs invoke(Varargs args) {
 			switch ( opcode ) {
 			case 0: return Bit32Lib.band( args );
 			case 1: return Bit32Lib.bnot( args );
 			case 2: return Bit32Lib.bor( args );
 			case 3: return Bit32Lib.btest( args );
 			case 4: return Bit32Lib.bxor( args );
 			case 5:
 				return Bit32Lib.extract( args.checkint(1), args.checkint(2), args.optint(3, 1) );
 			case 6:
 				return Bit32Lib.replace( args.checkint(1), args.checkint(2),
 						args.checkint(3), args.optint(4, 1) );
 			}
 			return NIL;
 		}
 	}

 	static final class Bit32Lib2 extends TwoArgFunction {

 		public LuaValue call(LuaValue arg1, LuaValue arg2) {
 			switch ( opcode ) {
 			case 0: return Bit32Lib.arshift(arg1.checkint(), arg2.checkint());
 			case 1: return Bit32Lib.lrotate(arg1.checkint(), arg2.checkint());
 			case 2: return Bit32Lib.lshift(arg1.checkint(), arg2.checkint());
 			case 3: return Bit32Lib.rrotate(arg1.checkint(), arg2.checkint());
 			case 4: return Bit32Lib.rshift(arg1.checkint(), arg2.checkint());
 			}
 			return NIL;
 		}

 	}

 	static LuaValue arshift(int x, int disp) {
 		if (disp >= 0) {
 			return bitsToValue(x >> disp);
 		} else {
 			return bitsToValue(x << -disp);
 		}
 	}

 	static LuaValue rshift(int x, int disp) {
 		if (disp >= 32 || disp <= -32) {
 			return ZERO;
 		} else if (disp >= 0) {
 			return bitsToValue(x >>> disp);
 		} else {
 			return bitsToValue(x << -disp);
 		}
 	}

 	static LuaValue lshift(int x, int disp) {
 		if (disp >= 32 || disp <= -32) {
 			return ZERO;
 		} else if (disp >= 0) {
 			return bitsToValue(x << disp);
 		} else {
 			return bitsToValue(x >>> -disp);
 		}
 	}

 	static Varargs band( Varargs args ) {
 		int result = -1;
 		for ( int i = 1; i <= args.narg(); i++ ) {
 			result &= args.checkint(i);
 		}
 		return bitsToValue( result );
 	}

 	static Varargs bnot( Varargs args ) {
 		return bitsToValue( ~args.checkint(1) );
 	}

 	static Varargs bor( Varargs args ) {
 		int result = 0;
 		for ( int i = 1; i <= args.narg(); i++ ) {
 			result |= args.checkint(i);
 		}
 		return bitsToValue( result );
 	}

 	static Varargs btest( Varargs args ) {
 		int bits = -1;
 		for ( int i = 1; i <= args.narg(); i++ ) {
 			bits &= args.checkint(i);
 		}
 		return valueOf( bits != 0 );
 	}

 	static Varargs bxor( Varargs args ) {
 		int result = 0;
 		for ( int i = 1; i <= args.narg(); i++ ) {
 			result ^= args.checkint(i);
 		}
 		return bitsToValue( result );
 	}

 	static LuaValue lrotate(int x, int disp) {
 		if (disp < 0) {
 			return rrotate(x, -disp);
 		} else {
 			disp = disp & 31;
 			return bitsToValue((x << disp) | (x >>> (32 - disp)));
 		}
 	}

 	static LuaValue rrotate(int x, int disp) {
 		if (disp < 0) {
 			return lrotate(x, -disp);
 		} else {
 			disp = disp & 31;
 			return bitsToValue((x >>> disp) | (x << (32 - disp)));
 		}
 	}

 	static LuaValue extract(int n, int field, int width) {
 		if (field < 0) {
 			argerror(2, "field cannot be negative");
 		}
 		if (width < 0) {
 			argerror(3, "width must be postive");
 		}
 		if (field + width > 32) {
 			error("trying to access non-existent bits");
 		}
 		return bitsToValue((n >>> field) & (-1 >>> (32 - width)));
 	}

 	static LuaValue replace(int n, int v, int field, int width) {
 		if (field < 0) {
 			argerror(3, "field cannot be negative");
 		}
 		if (width < 0) {
 			argerror(4, "width must be postive");
 		}
 		if (field + width > 32) {
 			error("trying to access non-existent bits");
 		}
 		int mask = (-1 >>> (32 - width)) << field;
 		n = (n & ~mask) | ((v << field) & mask);
 		return bitsToValue(n);
 	}

 	private static LuaValue bitsToValue( int x ) {
 		return ( x < 0 ) ? valueOf((double) ((long) x & 0xFFFFFFFFL)) : valueOf(x);
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2012 Luaj.org. All rights reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	******************************************************************************/
	package org.luaj.vm3.lib;

	import org.luaj.vm3.LuaTable;
	import org.luaj.vm3.LuaValue;
	import org.luaj.vm3.Varargs;

	/**
	* Subclass of LibFunction that implements the Lua standard {@code bit32} library.
	* <p>
	* Typically, this library is included as part of a call to either
	* {@link JsePlatform#standardGlobals()} or {@link JmePlatform#standardGlobals()}
	* <pre> {@code
	* Globals globals = JsePlatform.standardGlobals();
	* System.out.println( globals.get("bit32").get("bnot").call( LuaValue.valueOf(2) ) );
	* } </pre>
	* <p>
	* To instantiate and use it directly,
	* link it into your globals table via {@link LuaValue#load(LuaValue)} using code such as:
	* <pre> {@code
	* Globals globals = new Globals();
	* globals.load(new JseBaseLib());
	* globals.load(new PackageLib());
	* globals.load(new Bit32Lib());
	* System.out.println( globals.get("bit32").get("bnot").call( LuaValue.valueOf(2) ) );
	* } </pre>
	* <p>
	* This has been implemented to match as closely as possible the behavior in the corresponding library in C.
	* @see LibFunction
	* @see JsePlatform
	* @see JmePlatform
	* @see <a href="http://www.lua.org/manual/5.2/manual.html#6.7">Lua 5.2 Bitwise Operation Lib Reference</a>
	*/
	public class Bit32Lib extends TwoArgFunction {

	public Bit32Lib() {
	}

	public LuaValue call(LuaValue modname, LuaValue env) {
	LuaTable t = new LuaTable();
	bind(t, Bit32LibV.class, new String[] {
	"band", "bnot", "bor", "btest", "bxor", "extract", "replace"
	});
	bind(t, Bit32Lib2.class, new String[] {
	"arshift", "lrotate", "lshift", "rrotate", "rshift"
	});
	env.set("bit32", t);
	env.get("package").get("loaded").set("bit32", t);
	return t;
	}

	static final class Bit32LibV extends VarArgFunction {
	public Varargs invoke(Varargs args) {
	switch ( opcode ) {
	case 0: return Bit32Lib.band( args );
	case 1: return Bit32Lib.bnot( args );
	case 2: return Bit32Lib.bor( args );
	case 3: return Bit32Lib.btest( args );
	case 4: return Bit32Lib.bxor( args );
	case 5:
	return Bit32Lib.extract( args.checkint(1), args.checkint(2), args.optint(3, 1) );
	case 6:
	return Bit32Lib.replace( args.checkint(1), args.checkint(2),
	args.checkint(3), args.optint(4, 1) );
	}
	return NIL;
	}
	}

	static final class Bit32Lib2 extends TwoArgFunction {

	public LuaValue call(LuaValue arg1, LuaValue arg2) {
	switch ( opcode ) {
	case 0: return Bit32Lib.arshift(arg1.checkint(), arg2.checkint());
	case 1: return Bit32Lib.lrotate(arg1.checkint(), arg2.checkint());
	case 2: return Bit32Lib.lshift(arg1.checkint(), arg2.checkint());
	case 3: return Bit32Lib.rrotate(arg1.checkint(), arg2.checkint());
	case 4: return Bit32Lib.rshift(arg1.checkint(), arg2.checkint());
	}
	return NIL;
	}

	}

	static LuaValue arshift(int x, int disp) {
	if (disp >= 0) {
	return bitsToValue(x >> disp);
	} else {
	return bitsToValue(x << -disp);
	}
	}

	static LuaValue rshift(int x, int disp) {
	if (disp >= 32 \|\| disp <= -32) {
	return ZERO;
	} else if (disp >= 0) {
	return bitsToValue(x >>> disp);
	} else {
	return bitsToValue(x << -disp);
	}
	}

	static LuaValue lshift(int x, int disp) {
	if (disp >= 32 \|\| disp <= -32) {
	return ZERO;
	} else if (disp >= 0) {
	return bitsToValue(x << disp);
	} else {
	return bitsToValue(x >>> -disp);
	}
	}

	static Varargs band( Varargs args ) {
	int result = -1;
	for ( int i = 1; i <= args.narg(); i++ ) {
	result &= args.checkint(i);
	}
	return bitsToValue( result );
	}

	static Varargs bnot( Varargs args ) {
	return bitsToValue( ~args.checkint(1) );
	}

	static Varargs bor( Varargs args ) {
	int result = 0;
	for ( int i = 1; i <= args.narg(); i++ ) {
	result \|= args.checkint(i);
	}
	return bitsToValue( result );
	}

	static Varargs btest( Varargs args ) {
	int bits = -1;
	for ( int i = 1; i <= args.narg(); i++ ) {
	bits &= args.checkint(i);
	}
	return valueOf( bits != 0 );
	}

	static Varargs bxor( Varargs args ) {
	int result = 0;
	for ( int i = 1; i <= args.narg(); i++ ) {
	result ^= args.checkint(i);
	}
	return bitsToValue( result );
	}

	static LuaValue lrotate(int x, int disp) {
	if (disp < 0) {
	return rrotate(x, -disp);
	} else {
	disp = disp & 31;
	return bitsToValue((x << disp) \| (x >>> (32 - disp)));
	}
	}

	static LuaValue rrotate(int x, int disp) {
	if (disp < 0) {
	return lrotate(x, -disp);
	} else {
	disp = disp & 31;
	return bitsToValue((x >>> disp) \| (x << (32 - disp)));
	}
	}

	static LuaValue extract(int n, int field, int width) {
	if (field < 0) {
	argerror(2, "field cannot be negative");
	}
	if (width < 0) {
	argerror(3, "width must be postive");
	}
	if (field + width > 32) {
	error("trying to access non-existent bits");
	}
	return bitsToValue((n >>> field) & (-1 >>> (32 - width)));
	}

	static LuaValue replace(int n, int v, int field, int width) {
	if (field < 0) {
	argerror(3, "field cannot be negative");
	}
	if (width < 0) {
	argerror(4, "width must be postive");
	}
	if (field + width > 32) {
	error("trying to access non-existent bits");
	}
	int mask = (-1 >>> (32 - width)) << field;
	n = (n & ~mask) \| ((v << field) & mask);
	return bitsToValue(n);
	}

	private static LuaValue bitsToValue( int x ) {
	return ( x < 0 ) ? valueOf((double) ((long) x & 0xFFFFFFFFL)) : valueOf(x);
	}
	}