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#include "upb/msg.h"
#include "upb/table.int.h"
#include "upb/port_def.inc"
#define VOIDPTR_AT(msg, ofs) (void*)((char*)msg + ofs)
/* Internal members of a upb_msg. We can change this without breaking binary
* compatibility. We put these before the user's data. The user's upb_msg*
* points after the upb_msg_internal. */
/* Used when a message is not extendable. */
typedef struct {
/* TODO(haberman): use pointer tagging so we we are slim when known unknown
* fields are not present. */
upb_arena *arena;
char *unknown;
size_t unknown_len;
size_t unknown_size;
} upb_msg_internal;
/* Used when a message is extendable. */
typedef struct {
upb_inttable *extdict;
upb_msg_internal base;
} upb_msg_internal_withext;
static int upb_msg_internalsize(const upb_msglayout *l) {
return sizeof(upb_msg_internal) - l->extendable * sizeof(void *);
}
static size_t upb_msg_sizeof(const upb_msglayout *l) {
return l->size + upb_msg_internalsize(l);
}
static upb_msg_internal *upb_msg_getinternal(upb_msg *msg) {
return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
}
static const upb_msg_internal *upb_msg_getinternal_const(const upb_msg *msg) {
return VOIDPTR_AT(msg, -sizeof(upb_msg_internal));
}
static upb_msg_internal_withext *upb_msg_getinternalwithext(
upb_msg *msg, const upb_msglayout *l) {
UPB_ASSERT(l->extendable);
return VOIDPTR_AT(msg, -sizeof(upb_msg_internal_withext));
}
upb_arena *upb_msg_arena(const upb_msg *msg) {
return upb_msg_getinternal_const(msg)->arena;
}
upb_msg *upb_msg_new(const upb_msglayout *l, upb_arena *a) {
upb_alloc *alloc = upb_arena_alloc(a);
void *mem = upb_malloc(alloc, upb_msg_sizeof(l));
upb_msg_internal *in;
upb_msg *msg;
if (!mem) {
return NULL;
}
msg = VOIDPTR_AT(mem, upb_msg_internalsize(l));
/* Initialize normal members. */
memset(msg, 0, l->size);
/* Initialize internal members. */
in = upb_msg_getinternal(msg);
in->arena = a;
in->unknown = NULL;
in->unknown_len = 0;
in->unknown_size = 0;
if (l->extendable) {
upb_msg_getinternalwithext(msg, l)->extdict = NULL;
}
return msg;
}
upb_array *upb_array_new(upb_fieldtype_t type, upb_arena *a) {
upb_alloc *alloc = upb_arena_alloc(a);
upb_array *ret = upb_malloc(alloc, sizeof(upb_array));
if (!ret) {
return NULL;
}
ret->type = type;
ret->data = NULL;
ret->len = 0;
ret->size = 0;
ret->arena = a;
return ret;
}
void upb_msg_addunknown(upb_msg *msg, const char *data, size_t len) {
upb_msg_internal* in = upb_msg_getinternal(msg);
if (len > in->unknown_size - in->unknown_len) {
upb_alloc *alloc = upb_arena_alloc(in->arena);
size_t need = in->unknown_size + len;
size_t newsize = UPB_MAX(in->unknown_size * 2, need);
in->unknown = upb_realloc(alloc, in->unknown, in->unknown_size, newsize);
in->unknown_size = newsize;
}
memcpy(in->unknown + in->unknown_len, data, len);
in->unknown_len += len;
}
const char *upb_msg_getunknown(const upb_msg *msg, size_t *len) {
const upb_msg_internal* in = upb_msg_getinternal_const(msg);
*len = in->unknown_len;
return in->unknown;
}
#undef VOIDPTR_AT
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