mirror of
https://github.com/matrix-construct/construct
synced 2024-11-26 08:42:34 +01:00
96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_CBOR_H
|
|
|
|
/// Concise Binary Object Representation (RFC7049)
|
|
///
|
|
namespace ircd::cbor
|
|
{
|
|
IRCD_EXCEPTION(ircd::error, error);
|
|
IRCD_EXCEPTION(error, type_error);
|
|
IRCD_EXCEPTION(error, parse_error);
|
|
IRCD_EXCEPTION(parse_error, buffer_underrun);
|
|
|
|
enum major :uint8_t;
|
|
enum minor :uint8_t;
|
|
struct head;
|
|
|
|
string_view reflect(const enum major &);
|
|
enum major major(const const_buffer &);
|
|
}
|
|
|
|
/// Item head.
|
|
///
|
|
/// This object represents the head byte and any following-integer bytes under
|
|
/// its const_buffer. If the major type has a payload, it starts immediately
|
|
/// following the end of this object's buffer. The first byte of this object's
|
|
/// buffer is the leading head byte. This object's buffer will never be empty()
|
|
/// unless it's default-initialized (i.e not pointing at anything).
|
|
///
|
|
/// This is used to query information about the item from the head data.
|
|
///
|
|
struct ircd::cbor::head
|
|
:const_buffer
|
|
{
|
|
static uint8_t major(const uint8_t &); // Major type
|
|
static uint8_t minor(const uint8_t &); // Minor type
|
|
static size_t length(const uint8_t &); // (1 + size(following()))
|
|
|
|
// Member ops when buffer has >= 1 byte
|
|
const uint8_t &leading() const; // Reference the leading byte
|
|
enum major major() const; // major(leading())
|
|
enum minor minor() const; // minor(leading())
|
|
size_t length() const; // length(leading())
|
|
|
|
// Get bytes following leading byte based on major/minor
|
|
const_buffer following() const;
|
|
template<class T> const T &following() const;
|
|
|
|
// Construct from at least first byte of item or more
|
|
head(const const_buffer &);
|
|
head() = default;
|
|
head(head &&) = default;
|
|
head(const head &) = default;
|
|
};
|
|
|
|
/// RFC7049 Major type codes
|
|
enum ircd::cbor::major
|
|
:uint8_t
|
|
{
|
|
POSITIVE = 0, ///< Z*
|
|
NEGATIVE = 1, ///< Z-
|
|
BINARY = 2, ///< Raw byte sequence
|
|
STRING = 3, ///< UTF-8 character sequence
|
|
ARRAY = 4, ///< Array of items
|
|
OBJECT = 5, ///< Dictionary of items
|
|
TAG = 6, ///< CBOR extensions (IANA registered)
|
|
PRIMITIVE = 7, ///< Literals / floats
|
|
};
|
|
|
|
/// RFC7049 Minor type codes
|
|
enum ircd::cbor::minor
|
|
:uint8_t
|
|
{
|
|
FALSE = 20, ///< False
|
|
TRUE = 21, ///< True
|
|
NUL = 22, ///< Null
|
|
UD = 23, ///< Undefined value
|
|
U8 = 24, ///< 8 bits follow
|
|
U16 = 25, ///< 16 bits follow
|
|
F16 = 25, ///< IEEE754 half-precision (16 bits follow)
|
|
U32 = 26, ///< 32 bits follow
|
|
F32 = 26, ///< IEEE754 single-precision (32 bits follow)
|
|
U64 = 27, ///< 64 bits follow
|
|
F64 = 27, ///< IEEE754 double-precision (64 bits follow)
|
|
STREAM = 31, ///< Variable length (terminated by BREAK)
|
|
BREAK = 31, ///< Terminator code
|
|
};
|