mirror of
https://github.com/edubart/otclient.git
synced 2025-05-04 11:39:20 +02:00
379 lines
9.4 KiB
C++
379 lines
9.4 KiB
C++
/*
|
|
* This is the bit32 library from lua 5.2.0, backported to
|
|
* lua 5.1.4.
|
|
*
|
|
* version 5.2.0-backport4
|
|
*
|
|
* This backport was assembled by Sean Bolton (sean at smbolton
|
|
* dot com) almost entirely from the above mentioned Lua distributions,
|
|
* which are:
|
|
*
|
|
* Copyright (C) 1994-2011 Lua.org, PUC-Rio. 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.
|
|
*/
|
|
|
|
#define LUA_LIB
|
|
|
|
extern "C" {
|
|
#include <lua.h>
|
|
#include <lauxlib.h>
|
|
}
|
|
|
|
/* ----- adapted from lua-5.2.0 luaconf.h: ----- */
|
|
|
|
/*
|
|
@@ LUA_UNSIGNED is the integral type used by lua_pushunsigned/lua_tounsigned.
|
|
** It must have at least 32 bits.
|
|
*/
|
|
#ifndef LUAI_INT32
|
|
#define LUAI_INT32 int
|
|
#endif
|
|
#define LUA_UNSIGNED unsigned LUAI_INT32
|
|
|
|
#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) /* { */
|
|
|
|
/* On a Microsoft compiler on a Pentium, use assembler to avoid clashes
|
|
with a DirectX idiosyncrasy */
|
|
#if defined(LUA_WIN) && defined(_MSC_VER) && defined(_M_IX86) /* { */
|
|
|
|
#define MS_ASMTRICK
|
|
|
|
#else /* }{ */
|
|
/* the next definition uses a trick that should work on any machine
|
|
using IEEE754 with a 32-bit integer type */
|
|
|
|
#define LUA_IEEE754TRICK
|
|
|
|
/*
|
|
@@ LUA_IEEEENDIAN is the endianness of doubles in your machine
|
|
** (0 for little endian, 1 for big endian); if not defined, Lua will
|
|
** check it dynamically.
|
|
*/
|
|
/* check for known architectures */
|
|
#if defined(__i386__) || defined(__i386) || defined(__X86__) || \
|
|
defined (__x86_64)
|
|
#define LUA_IEEEENDIAN 0
|
|
#elif defined(__POWERPC__) || defined(__ppc__)
|
|
#define LUA_IEEEENDIAN 1
|
|
#endif
|
|
|
|
#endif /* } */
|
|
|
|
#endif /* } */
|
|
|
|
/* ----- from lua-5.2.0 lua.h: ----- */
|
|
|
|
/* unsigned integer type */
|
|
typedef LUA_UNSIGNED lua_Unsigned;
|
|
|
|
/* ----- adapted from lua-5.2.0 llimits.h: ----- */
|
|
|
|
/* lua_number2unsigned is a macro to convert a lua_Number to a lua_Unsigned.
|
|
** lua_unsigned2number is a macro to convert a lua_Unsigned to a lua_Number.
|
|
*/
|
|
|
|
#if defined(MS_ASMTRICK) /* { */
|
|
/* trick with Microsoft assembler for X86 */
|
|
|
|
#define lua_number2unsigned(i,n) \
|
|
{__int64 l; __asm {__asm fld n __asm fistp l} i = (unsigned int)l;}
|
|
|
|
#elif defined(LUA_IEEE754TRICK) /* }{ */
|
|
/* the next trick should work on any machine using IEEE754 with
|
|
a 32-bit integer type */
|
|
|
|
union luai_Cast2 { double l_d; LUAI_INT32 l_p[2]; };
|
|
|
|
#if !defined(LUA_IEEEENDIAN) /* { */
|
|
#define LUAI_EXTRAIEEE \
|
|
static const union luai_Cast2 ieeeendian = {-(33.0 + 6755399441055744.0)};
|
|
#define LUA_IEEEENDIAN (ieeeendian.l_p[1] == 33)
|
|
#else
|
|
#define LUAI_EXTRAIEEE /* empty */
|
|
#endif /* } */
|
|
|
|
#define lua_number2int32(i,n,t) \
|
|
{ LUAI_EXTRAIEEE \
|
|
volatile union luai_Cast2 u; u.l_d = (n) + 6755399441055744.0; \
|
|
(i) = (t)u.l_p[LUA_IEEEENDIAN]; }
|
|
|
|
#define lua_number2unsigned(i,n) lua_number2int32(i, n, lua_Unsigned)
|
|
|
|
#endif /* } */
|
|
|
|
#if !defined(lua_number2unsigned) /* { */
|
|
/* the following definition assures proper modulo behavior */
|
|
#if defined(LUA_NUMBER_DOUBLE)
|
|
#include <cmath>
|
|
#define SUPUNSIGNED ((lua_Number)(~(lua_Unsigned)0) + 1)
|
|
#define lua_number2unsigned(i,n) \
|
|
((i)=(lua_Unsigned)((n) - floor((n)/SUPUNSIGNED)*SUPUNSIGNED))
|
|
#else
|
|
#define lua_number2unsigned(i,n) ((i)=(lua_Unsigned)(n))
|
|
#endif
|
|
#endif /* } */
|
|
|
|
/* on several machines, coercion from unsigned to double is slow,
|
|
so it may be worth to avoid */
|
|
#define lua_unsigned2number(u) \
|
|
(((u) <= (lua_Unsigned)INT_MAX) ? (lua_Number)(int)(u) : (lua_Number)(u))
|
|
|
|
/* ----- adapted from lua-5.2.0 lapi.c: ----- */
|
|
|
|
static void lua_pushunsigned (lua_State *L, lua_Unsigned u) {
|
|
lua_Number n;
|
|
n = lua_unsigned2number(u);
|
|
lua_pushnumber(L, n);
|
|
}
|
|
|
|
/* ----- adapted from lua-5.2.0-work3 lbitlib.c getuintarg(): ----- */
|
|
|
|
static lua_Unsigned luaL_checkunsigned (lua_State *L, int arg) {
|
|
lua_Unsigned r;
|
|
lua_Number x = lua_tonumber(L, arg);
|
|
if (x == 0) luaL_checktype(L, arg, LUA_TNUMBER);
|
|
lua_number2unsigned(r, x);
|
|
return r;
|
|
}
|
|
|
|
/* ----- Lua 5.2 luaL_newlib() compatibility: ----- */
|
|
|
|
#define LUAMOD_API LUALIB_API
|
|
#define LUA_BIT32LIBNAME "bit32"
|
|
#undef luaL_newlib
|
|
#define luaL_newlib(x, y) luaL_register(x, LUA_BIT32LIBNAME, y)
|
|
|
|
/* ----- avoid a 'symbol redefined' warning below ----- */
|
|
|
|
#undef LUA_LIB
|
|
|
|
/* ----- here follows the unmodified lbitlib.c from Lua 5.2.0 ----- */
|
|
|
|
/*
|
|
** $Id: lbitlib.c,v 1.16 2011/06/20 16:35:23 roberto Exp $
|
|
** Standard library for bitwise operations
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#define lbitlib_c
|
|
#define LUA_LIB
|
|
|
|
#include "lua.h"
|
|
|
|
#include "lauxlib.h"
|
|
#include "lualib.h"
|
|
|
|
|
|
/* number of bits to consider in a number */
|
|
#if !defined(LUA_NBITS)
|
|
#define LUA_NBITS 32
|
|
#endif
|
|
|
|
|
|
#define ALLONES (~(((~(lua_Unsigned)0) << (LUA_NBITS - 1)) << 1))
|
|
|
|
/* macro to trim extra bits */
|
|
#define trim(x) ((x) & ALLONES)
|
|
|
|
|
|
/* builds a number with 'n' ones (1 <= n <= LUA_NBITS) */
|
|
#define mask(n) (~((ALLONES << 1) << ((n) - 1)))
|
|
|
|
|
|
typedef lua_Unsigned b_uint;
|
|
|
|
|
|
|
|
static b_uint andaux (lua_State *L) {
|
|
int i, n = lua_gettop(L);
|
|
b_uint r = ~(b_uint)0;
|
|
for (i = 1; i <= n; i++)
|
|
r &= luaL_checkunsigned(L, i);
|
|
return trim(r);
|
|
}
|
|
|
|
|
|
static int b_and (lua_State *L) {
|
|
b_uint r = andaux(L);
|
|
lua_pushunsigned(L, r);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_test (lua_State *L) {
|
|
b_uint r = andaux(L);
|
|
lua_pushboolean(L, r != 0);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_or (lua_State *L) {
|
|
int i, n = lua_gettop(L);
|
|
b_uint r = 0;
|
|
for (i = 1; i <= n; i++)
|
|
r |= luaL_checkunsigned(L, i);
|
|
lua_pushunsigned(L, trim(r));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_xor (lua_State *L) {
|
|
int i, n = lua_gettop(L);
|
|
b_uint r = 0;
|
|
for (i = 1; i <= n; i++)
|
|
r ^= luaL_checkunsigned(L, i);
|
|
lua_pushunsigned(L, trim(r));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_not (lua_State *L) {
|
|
b_uint r = ~luaL_checkunsigned(L, 1);
|
|
lua_pushunsigned(L, trim(r));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_shift (lua_State *L, b_uint r, int i) {
|
|
if (i < 0) { /* shift right? */
|
|
i = -i;
|
|
r = trim(r);
|
|
if (i >= LUA_NBITS) r = 0;
|
|
else r >>= i;
|
|
}
|
|
else { /* shift left */
|
|
if (i >= LUA_NBITS) r = 0;
|
|
else r <<= i;
|
|
r = trim(r);
|
|
}
|
|
lua_pushunsigned(L, r);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_lshift (lua_State *L) {
|
|
return b_shift(L, luaL_checkunsigned(L, 1), luaL_checkint(L, 2));
|
|
}
|
|
|
|
|
|
static int b_rshift (lua_State *L) {
|
|
return b_shift(L, luaL_checkunsigned(L, 1), -luaL_checkint(L, 2));
|
|
}
|
|
|
|
|
|
static int b_arshift (lua_State *L) {
|
|
b_uint r = luaL_checkunsigned(L, 1);
|
|
int i = luaL_checkint(L, 2);
|
|
if (i < 0 || !(r & ((b_uint)1 << (LUA_NBITS - 1))))
|
|
return b_shift(L, r, -i);
|
|
else { /* arithmetic shift for 'negative' number */
|
|
if (i >= LUA_NBITS) r = ALLONES;
|
|
else
|
|
r = trim((r >> i) | ~(~(b_uint)0 >> i)); /* add signal bit */
|
|
lua_pushunsigned(L, r);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
static int b_rot (lua_State *L, int i) {
|
|
b_uint r = luaL_checkunsigned(L, 1);
|
|
i &= (LUA_NBITS - 1); /* i = i % NBITS */
|
|
r = trim(r);
|
|
r = (r << i) | (r >> (LUA_NBITS - i));
|
|
lua_pushunsigned(L, trim(r));
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_lrot (lua_State *L) {
|
|
return b_rot(L, luaL_checkint(L, 2));
|
|
}
|
|
|
|
|
|
static int b_rrot (lua_State *L) {
|
|
return b_rot(L, -luaL_checkint(L, 2));
|
|
}
|
|
|
|
|
|
/*
|
|
** get field and width arguments for field-manipulation functions,
|
|
** checking whether they are valid
|
|
*/
|
|
static int fieldargs (lua_State *L, int farg, int *width) {
|
|
int f = luaL_checkint(L, farg);
|
|
int w = luaL_optint(L, farg + 1, 1);
|
|
luaL_argcheck(L, 0 <= f, farg, "field cannot be negative");
|
|
luaL_argcheck(L, 0 < w, farg + 1, "width must be positive");
|
|
if (f + w > LUA_NBITS)
|
|
luaL_error(L, "trying to access non-existent bits");
|
|
*width = w;
|
|
return f;
|
|
}
|
|
|
|
|
|
static int b_extract (lua_State *L) {
|
|
int w;
|
|
b_uint r = luaL_checkunsigned(L, 1);
|
|
int f = fieldargs(L, 2, &w);
|
|
r = (r >> f) & mask(w);
|
|
lua_pushunsigned(L, r);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int b_replace (lua_State *L) {
|
|
int w;
|
|
b_uint r = luaL_checkunsigned(L, 1);
|
|
b_uint v = luaL_checkunsigned(L, 2);
|
|
int f = fieldargs(L, 3, &w);
|
|
int m = mask(w);
|
|
v &= m; /* erase bits outside given width */
|
|
r = (r & ~(m << f)) | (v << f);
|
|
lua_pushunsigned(L, r);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static const luaL_Reg bitlib[] = {
|
|
{"arshift", b_arshift},
|
|
{"band", b_and},
|
|
{"bnot", b_not},
|
|
{"bor", b_or},
|
|
{"bxor", b_xor},
|
|
{"btest", b_test},
|
|
{"extract", b_extract},
|
|
{"lrotate", b_lrot},
|
|
{"lshift", b_lshift},
|
|
{"replace", b_replace},
|
|
{"rrotate", b_rrot},
|
|
{"rshift", b_rshift},
|
|
{nullptr, nullptr}
|
|
};
|
|
|
|
int luaopen_bit32 (lua_State *L) {
|
|
luaL_newlib(L, bitlib);
|
|
return 1;
|
|
}
|
|
|
|
#undef trim
|
|
|