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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*
* Data structure for storing a message of protobuf data.
*/
#ifndef UPB_MSG_H
#define UPB_MSG_H
#include "upb.h"
#include "upb_def.h"
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
upb_value upb_field_tryrecycle(upb_valueptr p, upb_value v, upb_fielddef *f,
upb_valuetype_t type);
INLINE void _upb_value_ref(upb_value v) { upb_atomic_ref(v.refcount); }
void _upb_field_free(upb_value v, upb_fielddef *f);
void _upb_elem_free(upb_value v, upb_fielddef *f);
INLINE void _upb_field_unref(upb_value v, upb_fielddef *f) {
assert(upb_field_ismm(f));
if (v.refcount && upb_atomic_unref(v.refcount))
_upb_field_free(v, f);
}
INLINE void _upb_elem_unref(upb_value v, upb_fielddef *f) {
assert(upb_elem_ismm(f));
if (v.refcount && upb_atomic_unref(v.refcount))
_upb_elem_free(v, f);
}
/* upb_array ******************************************************************/
typedef uint32_t upb_arraylen_t;
struct _upb_array {
upb_atomic_refcount_t refcount;
upb_arraylen_t len;
upb_arraylen_t size;
upb_valueptr elements;
};
void _upb_array_free(upb_array *a, upb_fielddef *f);
INLINE upb_valueptr _upb_array_getptr(upb_array *a, upb_fielddef *f,
uint32_t elem) {
upb_valueptr p;
p._void = &a->elements.uint8[elem * upb_types[f->type].size];
return p;
}
upb_array *upb_array_new(void);
INLINE void upb_array_unref(upb_array *a, upb_fielddef *f) {
if (upb_atomic_unref(&a->refcount)) _upb_array_free(a, f);
}
INLINE uint32_t upb_array_len(upb_array *a) {
return a->len;
}
INLINE upb_value upb_array_get(upb_array *a, upb_fielddef *f, uint32_t elem) {
assert(elem < upb_array_len(a));
return upb_value_read(_upb_array_getptr(a, f, elem), f->type);
}
// For string or submessages, will release a ref on the previously set value.
// and take a ref on the new value. The array must already be at least "elem"
// long; to append use append_mutable.
INLINE void upb_array_set(upb_array *a, upb_fielddef *f, uint32_t elem,
upb_value val) {
assert(elem < upb_array_len(a));
upb_valueptr p = _upb_array_getptr(a, f, elem);
if (upb_elem_ismm(f)) {
_upb_elem_unref(upb_value_read(p, f->type), f);
_upb_value_ref(val);
}
upb_value_write(p, val, f->type);
}
INLINE void upb_array_resize(upb_array *a, upb_fielddef *f) {
if (a->len == a->size) {
a->len *= 2;
a->elements._void = realloc(a->elements._void,
a->len * upb_types[f->type].size);
}
}
// Append an element to an array of string or submsg with the default value,
// returning it. This will try to reuse previously allocated memory.
INLINE upb_value upb_array_appendmutable(upb_array *a, upb_fielddef *f) {
assert(upb_elem_ismm(f));
upb_array_resize(a, f);
upb_valueptr p = _upb_array_getptr(a, f, a->len++);
upb_valuetype_t type = upb_elem_valuetype(f);
upb_value val = upb_value_read(p, type);
val = upb_field_tryrecycle(p, val, f, type);
return val;
}
/* upb_msg ********************************************************************/
struct _upb_msg {
upb_atomic_refcount_t refcount;
uint8_t data[4]; // We allocate the appropriate amount per message.
};
// INTERNAL-ONLY FUNCTIONS.
void _upb_msg_free(upb_msg *msg, upb_msgdef *md);
// Returns a pointer to the given field.
INLINE upb_valueptr _upb_msg_getptr(upb_msg *msg, upb_fielddef *f) {
upb_valueptr p;
p._void = &msg->data[f->byte_offset];
return p;
}
// PUBLIC FUNCTIONS.
// Creates a new msg of the given type.
upb_msg *upb_msg_new(upb_msgdef *md);
// Unrefs the given message.
INLINE void upb_msg_unref(upb_msg *msg, upb_msgdef *md) {
if (msg && upb_atomic_unref(&msg->refcount)) _upb_msg_free(msg, md);
}
// Tests whether the given field is explicitly set, or whether it will return a
// default.
INLINE bool upb_msg_has(upb_msg *msg, upb_fielddef *f) {
return (msg->data[f->field_index/8] & (1 << (f->field_index % 8))) != 0;
}
// Unsets all field values back to their defaults.
INLINE void upb_msg_clear(upb_msg *msg, upb_msgdef *md) {
memset(msg->data, 0, md->set_flags_bytes);
}
// Used to obtain an empty message of the given type, attempting to reuse the
// memory pointed to by msg if it has no other referents.
void upb_msg_recycle(upb_msg **_msg, upb_msgdef *md);
// For a repeated field, appends the given scalar value (ie. not a message or
// array) to the field's array; for non-repeated fields, overwrites the
// existing value with this one.
// REQUIRES: !upb_issubmsg(f)
void upb_msg_appendval(upb_msg *msg, upb_fielddef *f, upb_value val);
upb_msg *upb_msg_append_emptymsg(upb_msg *msg, upb_fielddef *f);
// Returns the current value of the given field if set, or the default value if
// not set. The returned value is not mutable! (In practice this only matters
// for submessages and arrays).
INLINE upb_value upb_msg_get(upb_msg *msg, upb_fielddef *f) {
if (upb_msg_has(msg, f)) {
return upb_value_read(_upb_msg_getptr(msg, f), f->type);
} else {
return f->default_value;
}
}
// If the given string, submessage, or array is already set, returns it.
// Otherwise sets it and returns an empty instance, attempting to reuse any
// previously allocated memory.
INLINE upb_value upb_msg_getmutable(upb_msg *msg, upb_fielddef *f);
// Sets the current value of the field. If this is a string, array, or
// submessage field, releases a ref on the value (if any) that was previously
// set.
INLINE void upb_msg_set(upb_msg *msg, upb_fielddef *f, upb_value val);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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