File

util-src/strbitop.c @ 12480:7e9ebdc75ce4

net: isolate LuaSec-specifics For this, various accessor functions are now provided directly on the sockets, which reach down into the LuaSec implementation to obtain the information. While this may seem of little gain at first, it hides the implementation detail of the LuaSec+LuaSocket combination that the actual socket and the TLS layer are separate objects. The net gain here is that an alternative implementation does not have to emulate that specific implementation detail and "only" has to expose LuaSec-compatible data structures on the new functions.
author Jonas Schäfer <jonas@wielicki.name>
date Wed, 27 Apr 2022 17:44:14 +0200
parent 12469:2b3adaa6d38e
child 12575:1f6f05a98fcd
line wrap: on
line source

/*
 * This project is MIT licensed. Please see the
 * COPYING file in the source package for more information.
 *
 * Copyright (C) 2016 Kim Alvefur
 */

#include <lua.h>
#include <lauxlib.h>

#if (LUA_VERSION_NUM == 501)
#define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
#endif

/* TODO Deduplicate code somehow */

static int strop_and(lua_State *L) {
	luaL_Buffer buf;
	size_t a, b, i;
	const char *str_a = luaL_checklstring(L, 1, &a);
	const char *str_b = luaL_checklstring(L, 2, &b);

	luaL_buffinit(L, &buf);

	if(a == 0 || b == 0) {
		lua_settop(L, 1);
		return 1;
	}

	for(i = 0; i < a; i++) {
		luaL_addchar(&buf, str_a[i] & str_b[i % b]);
	}

	luaL_pushresult(&buf);
	return 1;
}

static int strop_or(lua_State *L) {
	luaL_Buffer buf;
	size_t a, b, i;
	const char *str_a = luaL_checklstring(L, 1, &a);
	const char *str_b = luaL_checklstring(L, 2, &b);

	luaL_buffinit(L, &buf);

	if(a == 0 || b == 0) {
		lua_settop(L, 1);
		return 1;
	}

	for(i = 0; i < a; i++) {
		luaL_addchar(&buf, str_a[i] | str_b[i % b]);
	}

	luaL_pushresult(&buf);
	return 1;
}

static int strop_xor(lua_State *L) {
	luaL_Buffer buf;
	size_t a, b, i;
	const char *str_a = luaL_checklstring(L, 1, &a);
	const char *str_b = luaL_checklstring(L, 2, &b);

	luaL_buffinit(L, &buf);

	if(a == 0 || b == 0) {
		lua_settop(L, 1);
		return 1;
	}

	for(i = 0; i < a; i++) {
		luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
	}

	luaL_pushresult(&buf);
	return 1;
}

LUA_API int luaopen_util_strbitop(lua_State *L) {
	luaL_Reg exports[] = {
		{ "sand", strop_and },
		{ "sor",  strop_or },
		{ "sxor", strop_xor },
		{ NULL, NULL }
	};

	lua_newtable(L);
	luaL_setfuncs(L, exports, 0);
	return 1;
}