/*
lightuserdata pattern
string format "ixrsmb"
integer size
*/
static int
_pattern_pack(lua_State *L) {
struct pbc_pattern * pat = lua_touserdata(L,1);
size_t format_sz = 0;
const char * format = lua_tolstring(L,2,&format_sz);
int size = lua_tointeger(L,3);
char data[size];
memset(data, 0 ,size);
char * ptr = data;
int i;
for (i=0;i<format_sz;i++) {
if (format[i] >= 'a' && format[i] <='z') {
ptr = _get_value(L, 4+i, ptr, format[i]);
} else {
if (!lua_istable(L,4+i)) {
luaL_error(L,"need table for array type");
}
int j;
int n = lua_rawlen(L,4+i);
for (j=0;j<n;j++) {
lua_rawgeti(L,4+i,j);
_get_array_value(L,(void *)ptr,format[i]);
lua_pop(L,1);
}
ptr += sizeof(pbc_array);
}
}
luaL_Buffer b;
luaL_buffinit(L, &b);
int cap = 128;
do {
char * temp = luaL_prepbuffsize(&b , cap);
struct pbc_slice slice;
slice.buffer = temp;
slice.len = cap;
int ret = pbc_pattern_pack(pat, data, &slice);
if (ret < 0) {
cap = cap * 2;
_Free(temp);
continue;
}
luaL_addsize(&b , slice.len);
} while (0);
luaL_pushresult(&b);
pbc_pattern_close_arrays(pat, data);
return 1;
}
/*
lightuserdata pattern
string format "ixrsmbp"
integer size
*/
static int
_pattern_pack(lua_State *L) {
struct pbc_pattern * pat = (struct pbc_pattern *)checkuserdata(L,1);
if (pat == NULL) {
return luaL_error(L, "pack pattern is NULL");
}
size_t format_sz = 0;
const char * format = lua_tolstring(L,2,&format_sz);
int size = lua_tointeger(L,3);
char * data = (char *)alloca(size);
// A trick , we don't need default value. zero buffer for array and message field.
// pbc_pattern_set_default(pat, data);
memset(data, 0 , size);
char * ptr = data;
int i;
for (i=0;i<format_sz;i++) {
if (format[i] >= 'a' && format[i] <='z') {
ptr = _get_value(L, 4+i, ptr, format[i]);
} else {
if (!lua_istable(L,4+i)) {
luaL_error(L,"need table for array type");
}
int j;
int n = lua_rawlen(L,4+i);
for (j=0;j<n;j++) {
lua_rawgeti(L,4+i,j+1);
_get_array_value(L,(struct _pbc_array *)ptr,format[i]);
lua_pop(L,1);
}
ptr += sizeof(pbc_array);
}
}
luaL_Buffer b;
luaL_buffinit(L, &b);
int cap = 128;
for (;;) {
char * temp = (char *)luaL_prepbuffsize(&b , cap);
struct pbc_slice slice;
slice.buffer = temp;
slice.len = cap;
int ret = pbc_pattern_pack(pat, data, &slice);
if (ret < 0) {
cap = cap * 2;
continue;
}
luaL_addsize(&b , slice.len);
break;
}
luaL_pushresult(&b);
pbc_pattern_close_arrays(pat, data);
return 1;
}
static int
test_pattern_pack(struct pbc_env *env , struct pbc_slice *slice) {
struct person p;
/*
If you don't care about default values (you will set all values by yourself) ,
you can also use memset(&p, 0 , sizeof(p)) instead of pbc_pattern_set_default.
*/
pbc_pattern_set_default(pat, &p);
p.name.buffer = (void*)"Alice";
p.name.len = -1; // encode '\0'
p.id = 1234;
p.email.buffer = (void*)"alice@unknown";
p.email.len = -1;
struct person_phone phone;
phone.number.buffer = (void *)"1234567";
phone.number.len = -1;
phone.type = 1;
char temp[128];
struct pbc_slice phone_slice = { temp, sizeof(temp) };
int unused = pbc_pattern_pack(pat_phone, &phone , &phone_slice);
if (unused < 0) {
slice->len = 0;
return slice->len;
}
pbc_array_push_slice(p.phone, &phone_slice);
pbc_pattern_set_default(pat_phone, &phone);
phone.number.buffer = (void *)"87654321";
phone.number.len = -1;
char temp2[128];
struct pbc_slice phone_slice2 = { temp2, sizeof(temp2) };
unused = pbc_pattern_pack(pat_phone, &phone , &phone_slice2);
if (unused < 0) {
slice->len = 0;
return slice->len;
}
pbc_array_push_slice(p.phone, &phone_slice2);
int i;
for (i=0;i<3;i++) {
pbc_array_push_integer(p.test, -i*4,0);
}
int r = pbc_pattern_pack(pat, &p, slice);
pbc_pattern_close_arrays(pat,&p);
printf("pack into %d bytes\n", slice->len);
return r;
}
