--- /dev/null
+/*
+** Lua BitOp -- a bit operations library for Lua 5.1/5.2.
+** http://bitop.luajit.org/
+**
+** Copyright (C) 2008-2012 Mike Pall. 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.
+**
+** [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
+*/
+
+#define LUA_BITOP_VERSION "1.0.2"
+
+#define LUA_LIB
+#include "lua.h"
+#include "lauxlib.h"
+
+#ifdef _MSC_VER
+/* MSVC is stuck in the last century and doesn't have C99's stdint.h. */
+typedef __int32 int32_t;
+typedef unsigned __int32 uint32_t;
+typedef unsigned __int64 uint64_t;
+#else
+#include <stdint.h>
+#endif
+
+typedef int32_t SBits;
+typedef uint32_t UBits;
+
+typedef union {
+ lua_Number n;
+#if defined(LUA_NUMBER_DOUBLE) || defined(LUA_FLOAT_DOUBLE)
+ uint64_t b;
+#else
+ UBits b;
+#endif
+} BitNum;
+
+/* Convert argument to bit type. */
+static UBits barg(lua_State *L, int idx)
+{
+ BitNum bn;
+ UBits b;
+#if LUA_VERSION_NUM < 502
+ bn.n = lua_tonumber(L, idx);
+#else
+ bn.n = luaL_checknumber(L, idx);
+#endif
+#if defined(LUA_NUMBER_DOUBLE) || defined(LUA_FLOAT_DOUBLE)
+ bn.n += 6755399441055744.0; /* 2^52+2^51 */
+#ifdef SWAPPED_DOUBLE
+ b = (UBits)(bn.b >> 32);
+#else
+ b = (UBits)bn.b;
+#endif
+#elif defined(LUA_NUMBER_INT) || defined(LUA_INT_INT) || \
+ defined(LUA_NUMBER_LONG) || defined(LUA_INT_LONG) || \
+ defined(LUA_NUMBER_LONGLONG) || defined(LUA_INT_LONGLONG) || \
+ defined(LUA_NUMBER_LONG_LONG) || defined(LUA_NUMBER_LLONG)
+ if (sizeof(UBits) == sizeof(lua_Number))
+ b = bn.b;
+ else
+ b = (UBits)(SBits)bn.n;
+#elif defined(LUA_NUMBER_FLOAT) || defined(LUA_FLOAT_FLOAT)
+#error "A 'float' lua_Number type is incompatible with this library"
+#else
+#error "Unknown number type, check LUA_NUMBER_*, LUA_FLOAT_*, LUA_INT_* in luaconf.h"
+#endif
+#if LUA_VERSION_NUM < 502
+ if (b == 0 && !lua_isnumber(L, idx)) {
+ luaL_typerror(L, idx, "number");
+ }
+#endif
+ return b;
+}
+
+/* Return bit type. */
+#if LUA_VERSION_NUM < 503
+#define BRET(b) lua_pushnumber(L, (lua_Number)(SBits)(b)); return 1;
+#else
+#define BRET(b) lua_pushinteger(L, (lua_Integer)(SBits)(b)); return 1;
+#endif
+
+static int bit_tobit(lua_State *L) { BRET(barg(L, 1)) }
+static int bit_bnot(lua_State *L) { BRET(~barg(L, 1)) }
+
+#define BIT_OP(func, opr) \
+ static int func(lua_State *L) { int i; UBits b = barg(L, 1); \
+ for (i = lua_gettop(L); i > 1; i--) b opr barg(L, i); BRET(b) }
+BIT_OP(bit_band, &=)
+BIT_OP(bit_bor, |=)
+BIT_OP(bit_bxor, ^=)
+
+#define bshl(b, n) (b << n)
+#define bshr(b, n) (b >> n)
+#define bsar(b, n) ((SBits)b >> n)
+#define brol(b, n) ((b << n) | (b >> (32-n)))
+#define bror(b, n) ((b << (32-n)) | (b >> n))
+#define BIT_SH(func, fn) \
+ static int func(lua_State *L) { \
+ UBits b = barg(L, 1); UBits n = barg(L, 2) & 31; BRET(fn(b, n)) }
+BIT_SH(bit_lshift, bshl)
+BIT_SH(bit_rshift, bshr)
+BIT_SH(bit_arshift, bsar)
+BIT_SH(bit_rol, brol)
+BIT_SH(bit_ror, bror)
+
+static int bit_bswap(lua_State *L)
+{
+ UBits b = barg(L, 1);
+ b = (b >> 24) | ((b >> 8) & 0xff00) | ((b & 0xff00) << 8) | (b << 24);
+ BRET(b)
+}
+
+static int bit_tohex(lua_State *L)
+{
+ UBits b = barg(L, 1);
+ SBits n = lua_isnone(L, 2) ? 8 : (SBits)barg(L, 2);
+ const char *hexdigits = "0123456789abcdef";
+ char buf[8];
+ int i;
+ if (n < 0) { n = -n; hexdigits = "0123456789ABCDEF"; }
+ if (n > 8) n = 8;
+ for (i = (int)n; --i >= 0; ) { buf[i] = hexdigits[b & 15]; b >>= 4; }
+ lua_pushlstring(L, buf, (size_t)n);
+ return 1;
+}
+
+static const struct luaL_Reg bit_funcs[] = {
+ { "tobit", bit_tobit },
+ { "bnot", bit_bnot },
+ { "band", bit_band },
+ { "bor", bit_bor },
+ { "bxor", bit_bxor },
+ { "lshift", bit_lshift },
+ { "rshift", bit_rshift },
+ { "arshift", bit_arshift },
+ { "rol", bit_rol },
+ { "ror", bit_ror },
+ { "bswap", bit_bswap },
+ { "tohex", bit_tohex },
+ { NULL, NULL }
+};
+
+/* Signed right-shifts are implementation-defined per C89/C99.
+** But the de facto standard are arithmetic right-shifts on two's
+** complement CPUs. This behaviour is required here, so test for it.
+*/
+#define BAD_SAR (bsar(-8, 2) != (SBits)-2)
+
+LUALIB_API int luaopen_bit(lua_State *L)
+{
+ UBits b;
+#if LUA_VERSION_NUM < 503
+ lua_pushnumber(L, (lua_Number)1437217655L);
+#else
+ lua_pushinteger(L, (lua_Integer)1437217655L);
+#endif
+ b = barg(L, -1);
+ if (b != (UBits)1437217655L || BAD_SAR) { /* Perform a simple self-test. */
+ const char *msg = "compiled with incompatible luaconf.h";
+#if defined(LUA_NUMBER_DOUBLE) || defined(LUA_FLOAT_DOUBLE)
+#ifdef _WIN32
+ if (b == (UBits)1610612736L)
+ msg = "use D3DCREATE_FPU_PRESERVE with DirectX";
+#endif
+ if (b == (UBits)1127743488L)
+ msg = "not compiled with SWAPPED_DOUBLE";
+#endif
+ if (BAD_SAR)
+ msg = "arithmetic right-shift broken";
+ luaL_error(L, "bit library self-test failed (%s)", msg);
+ }
+#if LUA_VERSION_NUM < 502
+ luaL_register(L, "bit", bit_funcs);
+#else
+ luaL_newlib(L, bit_funcs);
+#endif
+ return 1;
+}
+
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