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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_string.h"
#include <stdlib.h>
#define UPB_STRING_UNFINALIZED -1
static uint32_t upb_round_up_pow2(uint32_t v) {
// http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
upb_string *upb_string_new() {
upb_string *str = malloc(sizeof(*str));
str->ptr = NULL;
str->size = 0;
str->len = UPB_STRING_UNFINALIZED;
upb_atomic_refcount_init(&str->refcount, 1);
return str;
}
void _upb_string_free(upb_string *str) {
if(str->ptr) free(str->ptr);
free(str);
}
char *upb_string_getrwbuf(upb_string *str, upb_strlen_t len) {
assert(str->len == UPB_STRING_UNFINALIZED);
if (str->size < len) {
str->size = upb_round_up_pow2(len);
str->ptr = realloc(str->ptr, str->size);
}
str->len = len;
return str->ptr;
}
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