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/*
* lmo - Lua Machine Objects - Lookup utility
*
* Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lmo_lualib.h"
extern char _lmo_error[1024];
static int lmo_L_open(lua_State *L) {
const char *filename = luaL_checklstring(L, 1, NULL);
lmo_archive_t *ar, **udata;
if( (ar = lmo_open(filename)) != NULL )
{
if( (udata = lua_newuserdata(L, sizeof(lmo_archive_t *))) != NULL )
{
*udata = ar;
luaL_getmetatable(L, LMO_ARCHIVE_META);
lua_setmetatable(L, -2);
return 1;
}
lua_pushnil(L);
lua_pushstring(L, "out of memory");
return 2;
}
lua_pushnil(L);
lua_pushstring(L, lmo_error());
return 2;
}
static int lmo_L_hash(lua_State *L) {
const char *data = luaL_checkstring(L, 1);
uint32_t hash = sfh_hash(data, strlen(data));
lua_pushnumber(L, hash);
return 1;
}
static int lmo_L_lookup(lua_State *L) {
lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
lmo_entry_t *e = (*ar)->index;
const char *key = luaL_checkstring(L, 2);
uint32_t hash = sfh_hash(key, strlen(key));
while( e != NULL )
{
if( e->key_id == hash )
{
lua_pushlstring(L, &(*ar)->mmap[e->offset], e->length);
return 1;
}
e = e->next;
}
lua_pushnil(L);
return 1;
}
static int lmo_L__gc(lua_State *L) {
lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
if( (*ar) != NULL )
lmo_close(*ar);
*ar = NULL;
return 0;
}
static int lmo_L__tostring(lua_State *L) {
lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
lua_pushfstring(L, "LMO Archive (%d bytes)", (*ar)->length);
return 1;
}
/* method table */
static const luaL_reg M[] = {
{"close", lmo_L__gc},
{"lookup", lmo_L_lookup},
{"__tostring", lmo_L__tostring},
{"__gc", lmo_L__gc},
{NULL, NULL}
};
/* module table */
static const luaL_reg R[] = {
{"open", lmo_L_open},
{"hash", lmo_L_hash},
{NULL, NULL}
};
LUALIB_API int luaopen_lmo(lua_State *L) {
luaL_newmetatable(L, LMO_LUALIB_META);
luaL_register(L, NULL, R);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_setglobal(L, LMO_LUALIB_META);
luaL_newmetatable(L, LMO_ARCHIVE_META);
luaL_register(L, NULL, M);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_setglobal(L, LMO_ARCHIVE_META);
return 1;
}
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