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378 lines
9.4 KiB
378 lines
9.4 KiB
/*
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* This is the bit32 library from lua 5.2.0, backported to
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* lua 5.1.4.
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*
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* version 5.2.0-backport4
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*
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* This backport was assembled by Sean Bolton (sean at smbolton
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* dot com) almost entirely from the above mentioned Lua distributions,
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* which are:
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*
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* Copyright (C) 1994-2011 Lua.org, PUC-Rio. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#define LUA_LIB
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extern "C" {
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#include <lua.h>
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#include <lauxlib.h>
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}
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/* ----- adapted from lua-5.2.0 luaconf.h: ----- */
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/*
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@@ LUA_UNSIGNED is the integral type used by lua_pushunsigned/lua_tounsigned.
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** It must have at least 32 bits.
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*/
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#ifndef LUAI_INT32
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#define LUAI_INT32 int
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#endif
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#define LUA_UNSIGNED unsigned LUAI_INT32
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#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) /* { */
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/* On a Microsoft compiler on a Pentium, use assembler to avoid clashes
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with a DirectX idiosyncrasy */
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#if defined(LUA_WIN) && defined(_MSC_VER) && defined(_M_IX86) /* { */
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#define MS_ASMTRICK
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#else /* }{ */
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/* the next definition uses a trick that should work on any machine
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using IEEE754 with a 32-bit integer type */
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#define LUA_IEEE754TRICK
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/*
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@@ LUA_IEEEENDIAN is the endianness of doubles in your machine
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** (0 for little endian, 1 for big endian); if not defined, Lua will
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** check it dynamically.
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*/
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/* check for known architectures */
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#if defined(__i386__) || defined(__i386) || defined(__X86__) || \
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defined (__x86_64)
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#define LUA_IEEEENDIAN 0
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#elif defined(__POWERPC__) || defined(__ppc__)
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#define LUA_IEEEENDIAN 1
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#endif
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#endif /* } */
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#endif /* } */
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/* ----- from lua-5.2.0 lua.h: ----- */
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/* unsigned integer type */
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typedef LUA_UNSIGNED lua_Unsigned;
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/* ----- adapted from lua-5.2.0 llimits.h: ----- */
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/* lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.
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** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.
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*/
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#if defined(MS_ASMTRICK) /* { */
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/* trick with Microsoft assembler for X86 */
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#define lua_number2unsigned(i,n) \
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{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
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#elif defined(LUA_IEEE754TRICK) /* }{ */
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/* the next trick should work on any machine using IEEE754 with
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a 32-bit integer type */
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union luai_Cast2 { double l_d; LUAI_INT32 l_p[2]; };
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#if !defined(LUA_IEEEENDIAN) /* { */
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#define LUAI_EXTRAIEEE \
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static const union luai_Cast2 ieeeendian = {-(33.0 + 6755399441055744.0)};
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#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
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#else
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#define LUAI_EXTRAIEEE /* empty */
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#endif /* } */
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#define lua_number2int32(i,n,t) \
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{ LUAI_EXTRAIEEE \
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volatile union luai_Cast2 u; u.l_d = (n) + 6755399441055744.0; \
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(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
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#define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned)
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#endif /* } */
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#if !defined(lua_number2unsigned) /* { */
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/* the following definition assures proper modulo behavior */
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#if defined(LUA_NUMBER_DOUBLE)
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#include <math.h>
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#define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1)
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#define lua_number2unsigned(i,n) \
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((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))
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#else
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#define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n))
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#endif
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#endif /* } */
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/* on several machines, coercion from unsigned to double is slow,
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so it may be worth to avoid */
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#define lua_unsigned2number(u) \
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(((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))
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/* ----- adapted from lua-5.2.0 lapi.c: ----- */
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static void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
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lua_Number n;
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n = lua_unsigned2number(u);
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lua_pushnumber(L, n);
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}
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/* ----- adapted from lua-5.2.0-work3 lbitlib.c getuintarg(): ----- */
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static lua_Unsigned luaL_checkunsigned (lua_State *L, int arg) {
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lua_Unsigned r;
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lua_Number x = lua_tonumber(L, arg);
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if (x == 0) luaL_checktype(L, arg, LUA_TNUMBER);
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lua_number2unsigned(r, x);
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return r;
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}
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/* ----- Lua 5.2 luaL_newlib() compatibility: ----- */
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#define LUAMOD_API LUALIB_API
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#define LUA_BIT32LIBNAME "bit32"
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#define luaL_newlib(x, y) luaL_register(x, LUA_BIT32LIBNAME, y)
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/* ----- avoid a 'symbol redefined' warning below ----- */
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#undef LUA_LIB
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/* ----- here follows the unmodified lbitlib.c from Lua 5.2.0 ----- */
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/*
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** $Id: lbitlib.c,v 1.16 2011/06/20 16:35:23 roberto Exp $
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** Standard library for bitwise operations
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** See Copyright Notice in lua.h
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*/
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#define lbitlib_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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/* number of bits to consider in a number */
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#if !defined(LUA_NBITS)
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#define LUA_NBITS 32
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#endif
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#define ALLONES (~(((~(lua_Unsigned)0) << (LUA_NBITS - 1)) << 1))
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/* macro to trim extra bits */
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#define trim(x) ((x) & ALLONES)
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/* builds a number with 'n' ones (1 <= n <= LUA_NBITS) */
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#define mask(n) (~((ALLONES << 1) << ((n) - 1)))
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typedef lua_Unsigned b_uint;
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static b_uint andaux (lua_State *L) {
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int i, n = lua_gettop(L);
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b_uint r = ~(b_uint)0;
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for (i = 1; i <= n; i++)
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r &= luaL_checkunsigned(L, i);
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return trim(r);
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}
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static int b_and (lua_State *L) {
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b_uint r = andaux(L);
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lua_pushunsigned(L, r);
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return 1;
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}
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static int b_test (lua_State *L) {
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b_uint r = andaux(L);
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lua_pushboolean(L, r != 0);
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return 1;
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}
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static int b_or (lua_State *L) {
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int i, n = lua_gettop(L);
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b_uint r = 0;
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for (i = 1; i <= n; i++)
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r |= luaL_checkunsigned(L, i);
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lua_pushunsigned(L, trim(r));
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return 1;
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}
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static int b_xor (lua_State *L) {
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int i, n = lua_gettop(L);
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b_uint r = 0;
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for (i = 1; i <= n; i++)
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r ^= luaL_checkunsigned(L, i);
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lua_pushunsigned(L, trim(r));
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return 1;
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}
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static int b_not (lua_State *L) {
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b_uint r = ~luaL_checkunsigned(L, 1);
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lua_pushunsigned(L, trim(r));
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return 1;
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}
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static int b_shift (lua_State *L, b_uint r, int i) {
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if (i < 0) { /* shift right? */
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i = -i;
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r = trim(r);
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if (i >= LUA_NBITS) r = 0;
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else r >>= i;
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}
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else { /* shift left */
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if (i >= LUA_NBITS) r = 0;
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else r <<= i;
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r = trim(r);
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}
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lua_pushunsigned(L, r);
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return 1;
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}
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static int b_lshift (lua_State *L) {
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return b_shift(L, luaL_checkunsigned(L, 1), luaL_checkint(L, 2));
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}
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static int b_rshift (lua_State *L) {
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return b_shift(L, luaL_checkunsigned(L, 1), -luaL_checkint(L, 2));
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}
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static int b_arshift (lua_State *L) {
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b_uint r = luaL_checkunsigned(L, 1);
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int i = luaL_checkint(L, 2);
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if (i < 0 || !(r & ((b_uint)1 << (LUA_NBITS - 1))))
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return b_shift(L, r, -i);
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else { /* arithmetic shift for 'negative' number */
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if (i >= LUA_NBITS) r = ALLONES;
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else
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r = trim((r >> i) | ~(~(b_uint)0 >> i)); /* add signal bit */
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lua_pushunsigned(L, r);
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return 1;
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}
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}
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static int b_rot (lua_State *L, int i) {
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b_uint r = luaL_checkunsigned(L, 1);
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i &= (LUA_NBITS - 1); /* i = i % NBITS */
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r = trim(r);
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r = (r << i) | (r >> (LUA_NBITS - i));
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lua_pushunsigned(L, trim(r));
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return 1;
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}
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static int b_lrot (lua_State *L) {
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return b_rot(L, luaL_checkint(L, 2));
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}
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static int b_rrot (lua_State *L) {
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return b_rot(L, -luaL_checkint(L, 2));
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}
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/*
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** get field and width arguments for field-manipulation functions,
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** checking whether they are valid
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*/
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static int fieldargs (lua_State *L, int farg, int *width) {
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int f = luaL_checkint(L, farg);
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int w = luaL_optint(L, farg + 1, 1);
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luaL_argcheck(L, 0 <= f, farg, "field cannot be negative");
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luaL_argcheck(L, 0 < w, farg + 1, "width must be positive");
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if (f + w > LUA_NBITS)
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luaL_error(L, "trying to access non-existent bits");
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*width = w;
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return f;
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}
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static int b_extract (lua_State *L) {
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int w;
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b_uint r = luaL_checkunsigned(L, 1);
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int f = fieldargs(L, 2, &w);
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r = (r >> f) & mask(w);
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lua_pushunsigned(L, r);
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return 1;
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}
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static int b_replace (lua_State *L) {
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int w;
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b_uint r = luaL_checkunsigned(L, 1);
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b_uint v = luaL_checkunsigned(L, 2);
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int f = fieldargs(L, 3, &w);
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int m = mask(w);
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v &= m; /* erase bits outside given width */
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r = (r & ~(m << f)) | (v << f);
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lua_pushunsigned(L, r);
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return 1;
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}
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static const luaL_Reg bitlib[] = {
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{"arshift", b_arshift},
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{"band", b_and},
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{"bnot", b_not},
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{"bor", b_or},
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{"bxor", b_xor},
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{"btest", b_test},
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{"extract", b_extract},
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{"lrotate", b_lrot},
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{"lshift", b_lshift},
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{"replace", b_replace},
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{"rrotate", b_rrot},
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{"rshift", b_rshift},
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{NULL, NULL}
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};
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int luaopen_bit32 (lua_State *L) {
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luaL_newlib(L, bitlib);
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return 1;
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}
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#undef trim
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