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#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
struct adler32_hash adler32_init(){
return (struct adler32_hash){.a = 1, .b = 0};
}
void adler32_update(uint8_t* aa, size_t len, struct adler32_hash* hash){
for(int i = 0; i != len; i++){
hash->a += aa[i];
hash->b += hash->a;
}
}
uint32_t adler32_final(struct adler32_hash* hash){
return hash->b * 65536 + hash->a;
}
uint32_t adler32(uint8_t* aa, size_t len){
struct adler32_hash dig = adler32_init();
adler32_update(aa, len, &dig);
return adler32_final(&dig);
}
int l_adler32_init(lua_State* L){
lua_newtable(L);
int t = lua_gettop(L);
struct adler32_hash* a = (struct adler32_hash*)lua_newuserdata(L, sizeof * a);
int ud = lua_gettop(L);
*a = adler32_init();
luaI_tsetv(L, t, "ud", ud);
luaI_tsetcf(L, t, "update", l_adler32_update);
luaI_tsetcf(L, t, "final", l_adler32_final);
lua_pushvalue(L, t);
return 1;
}
int l_adler32_update(lua_State* L){
lua_pushstring(L, "ud");
lua_gettable(L, 1);
struct adler32_hash* a = (struct adler32_hash*)lua_touserdata(L, -1);
size_t len = 0;
uint8_t* b = (uint8_t*)luaL_checklstring(L, 2, &len);
adler32_update(b, len, a);
lua_pushvalue(L, 1);
return 1;
}
int l_adler32_final(lua_State* L){
lua_pushstring(L, "ud");
lua_gettable(L, 1);
struct adler32_hash* a = (struct adler32_hash*)lua_touserdata(L, -1);
uint32_t u = adler32_final(a);
char digest[32];
sprintf(digest,"%08x",u);
lua_pushstring(L, digest);
return 1;
}
int l_adler32(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
char digest[32];
uint32_t u = adler32(a, len);
sprintf(digest,"%08x",u);
lua_pushstring(L, digest);
return 1;
}
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