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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*/
#include <stdlib.h>
#include "upb_data.h"
#include "upb_def.h"
static uint32_t round_up_to_pow2(uint32_t v)
{
/* cf. 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_data *******************************************************************/
static void data_elem_unref(void *d, struct upb_fielddef *f) {
if(f->type == UPB_TYPE(MESSAGE) || f->type == UPB_TYPE(GROUP)) {
upb_msg_unref((upb_msg*)d, upb_downcast_msgdef(f->def));
} else if(f->type == UPB_TYPE(STRING) || f->type == UPB_TYPE(BYTES)) {
upb_string_unref((upb_string*)d);
}
}
static void data_unref(void *d, struct upb_fielddef *f) {
if(upb_isarray(f)) {
upb_array_unref((upb_array*)d, f);
} else {
data_elem_unref(d, f);
}
}
INLINE void data_init(upb_data *d, int flags) {
d->v = flags;
}
static void check_not_frozen(upb_data *d) {
// On one hand I am reluctant to put abort() calls in a low-level library
// that are enabled in a production build. On the other hand, this is a bug
// in the client code that we cannot recover from, and it seems better to get
// the error here than later.
if(upb_data_hasflag(d, UPB_DATA_FROZEN)) abort();
}
static upb_strlen_t string_get_bytesize(upb_string *s) {
if(upb_data_hasflag(&s->common.base, UPB_DATA_REFCOUNTED)) {
return s->refcounted.byte_size;
} else {
return (s->norefcount.byte_size_and_flags & 0xFFFFFFF8) >> 3;
}
}
static void string_set_bytesize(upb_string *s, upb_strlen_t newsize) {
if(upb_data_hasflag(&s->common.base, UPB_DATA_REFCOUNTED)) {
s->refcounted.byte_size = newsize;
} else {
s->norefcount.byte_size_and_flags &= 0x7;
s->norefcount.byte_size_and_flags |= (newsize << 3);
}
}
/* upb_string *******************************************************************/
upb_string *upb_string_new() {
upb_string *s = malloc(sizeof(upb_refcounted_string));
data_init(&s->common.base, UPB_DATA_HEAPALLOCATED | UPB_DATA_REFCOUNTED);
s->refcounted.byte_size = 0;
s->common.byte_len = 0;
s->common.ptr = NULL;
return s;
}
void _upb_string_free(upb_string *s)
{
if(string_get_bytesize(s) != 0) free(s->common.ptr);
free(s);
}
void upb_string_resize(upb_string *s, upb_strlen_t byte_len) {
check_not_frozen(&s->common.base);
if(string_get_bytesize(s) < byte_len) {
// Need to resize.
size_t new_byte_size = round_up_to_pow2(byte_len);
s->common.ptr = realloc(s->common.ptr, new_byte_size);
string_set_bytesize(s, new_byte_size);
}
s->common.byte_len = byte_len;
}
upb_string *upb_strreadfile(const char *filename) {
FILE *f = fopen(filename, "rb");
if(!f) return false;
if(fseek(f, 0, SEEK_END) != 0) goto error;
long size = ftell(f);
if(size < 0) goto error;
if(fseek(f, 0, SEEK_SET) != 0) goto error;
upb_string *s = upb_string_new();
char *buf = upb_string_getrwbuf(s, size);
if(fread(buf, size, 1, f) != 1) goto error;
fclose(f);
return s;
error:
fclose(f);
return NULL;
}
/* upb_array ******************************************************************/
// ONLY handles refcounted arrays for the moment.
void _upb_array_free(upb_array *a, struct upb_fielddef *f)
{
if(upb_elem_ismm(f)) {
for(upb_arraylen_t i = 0; i < a->refcounted.size; i++) {
union upb_value_ptr p = _upb_array_getptr(a, f, i);
data_elem_unref(p._void, f);
}
}
if(a->refcounted.size != 0) free(a->common.elements._void);
free(a);
}
/* upb_msg ********************************************************************/
upb_msg *upb_msg_new(struct upb_msgdef *md) {
upb_msg *msg = malloc(md->size);
memset(msg, 0, md->size);
data_init(&msg->base, UPB_DATA_HEAPALLOCATED | UPB_DATA_REFCOUNTED);
return msg;
}
// ONLY handles refcounted messages for the moment.
void _upb_msg_free(upb_msg *msg, struct upb_msgdef *md)
{
for(int i = 0; i < md->num_fields; i++) {
struct upb_fielddef *f = &md->fields[i];
union upb_value_ptr p = _upb_msg_getptr(msg, f);
if(!upb_field_ismm(f) || !p._void) continue;
data_unref(p._void, f);
}
upb_def_unref(UPB_UPCAST(md));
free(msg);
}
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