2 * lmo - Lua Machine Objects - Lua binding
4 * Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 #include "lmo_lualib.h"
21 extern char _lmo_error[1024];
24 static int lmo_L_open(lua_State *L) {
25 const char *filename = luaL_checklstring(L, 1, NULL);
26 lmo_archive_t *ar, **udata;
28 if( (ar = lmo_open(filename)) != NULL )
30 if( (udata = lua_newuserdata(L, sizeof(lmo_archive_t *))) != NULL )
33 luaL_getmetatable(L, LMO_ARCHIVE_META);
34 lua_setmetatable(L, -2);
40 lua_pushstring(L, "out of memory");
45 lua_pushstring(L, lmo_error());
49 static int lmo_L_hash(lua_State *L) {
50 const char *data = luaL_checkstring(L, 1);
51 uint32_t hash = sfh_hash(data, strlen(data));
52 lua_pushinteger(L, (lua_Integer)hash);
56 static int _lmo_lookup(lua_State *L, lmo_archive_t *ar, uint32_t hash) {
57 lmo_entry_t *e = ar->index;
61 if( e->key_id == hash )
63 lua_pushlstring(L, &ar->mmap[e->offset], e->length);
74 static int lmo_L_get(lua_State *L) {
75 lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
76 uint32_t hash = (uint32_t) luaL_checknumber(L, 2);
77 return _lmo_lookup(L, *ar, hash);
80 static int lmo_L_lookup(lua_State *L) {
81 lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
82 const char *key = luaL_checkstring(L, 2);
83 uint32_t hash = sfh_hash(key, strlen(key));
84 return _lmo_lookup(L, *ar, hash);
87 static int lmo_L_foreach(lua_State *L) {
88 lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
89 lmo_entry_t *e = (*ar)->index;
91 if( lua_isfunction(L, 2) )
96 lua_pushinteger(L, e->key_id);
97 lua_pushlstring(L, &(*ar)->mmap[e->offset], e->length);
98 lua_pcall(L, 2, 0, 0);
106 static int lmo_L__gc(lua_State *L) {
107 lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
117 static int lmo_L__tostring(lua_State *L) {
118 lmo_archive_t **ar = luaL_checkudata(L, 1, LMO_ARCHIVE_META);
119 lua_pushfstring(L, "LMO Archive (%d bytes)", (*ar)->length);
125 static const luaL_reg M[] = {
126 {"close", lmo_L__gc},
128 {"lookup", lmo_L_lookup},
129 {"foreach", lmo_L_foreach},
130 {"__tostring", lmo_L__tostring},
136 static const luaL_reg R[] = {
137 {"open", lmo_L_open},
138 {"hash", lmo_L_hash},
142 LUALIB_API int luaopen_lmo(lua_State *L) {
143 luaL_newmetatable(L, LMO_ARCHIVE_META);
144 luaL_register(L, NULL, M);
145 lua_pushvalue(L, -1);
146 lua_setfield(L, -2, "__index");
147 lua_setglobal(L, LMO_ARCHIVE_META);
149 luaL_register(L, LMO_LUALIB_META, R);