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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * ipa_controls.cpp - IPA control handling
 */

#include <libcamera/ipa/ipa_controls.h>

/**
 * \file ipa_controls.h
 * \brief Type definitions for serialized controls
 *
 * This file defines binary formats to store ControlList and ControlInfoMap
 * instances in contiguous, self-contained memory areas called control packets.
 * It describes the layout of the packets through a set of C structures. These
 * formats shall be used when serializing ControlList and ControlInfoMap to
 * transfer them through the IPA C interface and IPA IPC transports.
 *
 * A control packet contains a list of entries, each of them describing a single
 * control info or control value. The packet starts with a fixed-size header
 * described by the ipa_controls_header structure, followed by an array of
 * fixed-size entries. Each entry is associated with data, stored either
 * directly in the entry, or in a data section after the entries array.
 *
 * The following diagram describes the layout of the ControlList packet.
 *
 * ~~~~
 *           +-------------------------+    .                      .
 *  Header / | ipa_controls_header     |    |                      |
 *         | |                         |    |                      |
 *         \ |                         |    |                      |
 *           +-------------------------+    |                      |
 *         / | ipa_control_value_entry |    | hdr.data_offset      |
 *         | | #0                      |    |                      |
 * Control | +-------------------------+    |                      |
 *   value | | ...                     |    |                      |
 * entries | +-------------------------+    |                      |
 *         | | ipa_control_value_entry |    |             hdr.size |
 *         \ | #hdr.entries - 1        |    |                      |
 *           +-------------------------+    |                      |
 *           | empty space (optional)  |    |                      |
 *           +-------------------------+ <--´  .                   |
 *         / | ...                     |       | entry[n].offset   |
 *    Data | | ...                     |       |                   |
 * section | | value data for entry #n | <-----´                   |
 *         \ | ...                     |                           |
 *           +-------------------------+                           |
 *           | empty space (optional)  |                           |
 *           +-------------------------+ <-------------------------´
 * ~~~~
 *
 * The packet header contains the size of the packet, the number of entries, and
 * the offset from the beginning of the packet to the data section. The packet
 * entries array immediately follows the header. The data section starts at the
 * offset ipa_controls_header::data_offset from the beginning of the packet, and
 * shall be aligned to a multiple of 8 bytes.
 *
 * Entries are described by the ipa_control_value_entry structure. They contain