include/lttng/msgpack.h

   1 /* SPDX-License-Identifier: LGPL-2.1-only
   2  * SPDX-FileCopyrightText: 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
   3  */
   4
   5 #ifndef _LTTNG_KERNEL_MSGPACK_H
   6 #define _LTTNG_KERNEL_MSGPACK_H
   7
   8 #ifdef __KERNEL__
   9 #include <linux/types.h>
  10 #else /* __KERNEL__ */
  11 #include <stdint.h>
  12 #endif /* __KERNEL__ */
  13
  14 struct lttng_msgpack_writer {
  15         uint8_t *buffer;
  16         uint8_t *write_pos;
  17         const uint8_t *end_write_pos;
  18         uint8_t array_nesting;
  19         uint8_t map_nesting;
  20 };
  21
  22 void lttng_msgpack_writer_init(
  23                 struct lttng_msgpack_writer *writer,
  24                 uint8_t *buffer, size_t size);
  25
  26 void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer);
  27
  28 int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer);
  29 int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer);
  30 int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer);
  31 int lttng_msgpack_write_unsigned_integer(
  32                 struct lttng_msgpack_writer *writer, uint64_t value);
  33 int lttng_msgpack_write_signed_integer(
  34                 struct lttng_msgpack_writer *writer, int64_t value);
  35 int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer,
  36                 const char *value);
  37 int lttng_msgpack_write_user_str(struct lttng_msgpack_writer *writer,
  38                 const char __user *value);
  39 int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count);
  40 int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer);
  41 int lttng_msgpack_begin_array(
  42                 struct lttng_msgpack_writer *writer, size_t count);
  43 int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer);
  44
  45 int lttng_msgpack_save_writer_pos(struct lttng_msgpack_writer *writer, uint8_t **pos);
  46 int lttng_msgpack_restore_writer_pos(struct lttng_msgpack_writer *writer, uint8_t *pos);
  47
  48 #endif /* _LTTNG_KERNEL_MSGPACK_H */