/*
 * Copyright 2019 Google LLC. All Rights Reserved. This file and proprietary
 * source code may only be used and distributed under the Widevine
 * License Agreement.
 */

#ifndef WIDEVINE_ODK_INCLUDE_ODK_MESSAGE_PRIV_H_
#define WIDEVINE_ODK_INCLUDE_ODK_MESSAGE_PRIV_H_

#ifdef __cplusplus
extern "C" {
#endif

/*
 * This file must only be included by odk_message.c and serialization_base.c.
 */

#include <stddef.h>
#include <stdint.h>

/*
 * This is the implementation of a message. This structure is private, i.e. it
 * should only be included by files that are allowed to modify the internals of
 * a message, that being odk_message.c and serialization_base.c. To ensure
 * proper alignment and message size, an ODK_Message_Impl should never be
 * allocated directly, instead allocate ODK_Message and cast to ODK_Message_Impl
 * because ODK_Message_Impl may be smaller than ODK_Message.
 */
typedef struct {
  uint8_t* base;
  size_t capacity;
  size_t size;
  size_t read_offset;
  ODK_MessageStatus status;
} ODK_Message_Impl;

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // WIDEVINE_ODK_INCLUDE_ODK_MESSAGE_PRIV_H_