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LuaMD5.cpp
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LuaMD5.cpp
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#include "LuaMD5.h"
#include <stdlib.h>
#include <string.h>
LuaMD5 * lua_tomd5(lua_State *L, int index){
LuaMD5 * luamd5 = (LuaMD5*)luaL_checkudata(L, index, LUAMD5);
if (luamd5 == NULL)
luaL_error(L, "parameter is not a %s", LUAMD5);
return luamd5;
}
LuaMD5 * lua_pushmd5(lua_State *L){
LuaMD5 * luamd5 = (LuaMD5*)lua_newuserdata(L, sizeof(LuaMD5));
if (luamd5 == NULL)
luaL_error(L, "Unable to create md5 instance");
luaL_getmetatable(L, LUAMD5);
lua_setmetatable(L, -2);
memset(luamd5, 0, sizeof(LuaMD5));
return luamd5;
}
int NewMD5(lua_State *L){
LuaMD5 * luamd5 = lua_pushmd5(L);
if (!luamd5)
luaL_error(L, "Unable to push md5 instance");
MD5Init(&luamd5->MD5);
return 1;
}
int UpdateMD5(lua_State *L){
LuaMD5 * luamd5 = lua_tomd5(L, 1);
if (!luamd5)
luaL_error(L, "Unable to get md5 instance");
else if (luamd5->hash && luamd5->hash[0] != '\0')
luaL_error(L, "Cannot update already finished md5 digest");
size_t len;
const char * data = luaL_tolstring(L, 2, &len);
if (data){
MD5Update(&luamd5->MD5, (unsigned char*)data, len);
}
lua_pop(L, 2);
return 0;
}
int FinalMD5(lua_State *L){
LuaMD5 * luamd5 = lua_tomd5(L, 1);
if (luamd5->hash || luamd5->hash[0] == '\0'){
MD5Final((unsigned char *)luamd5->hash, &luamd5->MD5);
}
char md5string[33];
for (int i = 0; i < 16; ++i)
sprintf(&md5string[i * 2], "%02x", (unsigned int)luamd5->hash[i]);
lua_pop(L, 1);
lua_pushstring(L,md5string);
lua_pushlstring(L, (const char *)luamd5->hash, 16);
return 2;
}
int md5_gc(lua_State *L){
LuaMD5 * luamd5 = lua_tomd5(L, 1);
if (!luamd5->hash){
MD5Final(luamd5->hash, &luamd5->MD5);
}
return 0;
}
int md5_tostring(lua_State *L){
char md5s[100];
sprintf(md5s, "MD5: 0x%08X", lua_tomd5(L, 1));
lua_pushfstring(L, md5s);
return 1;
}