The <QtCborCommon> header contains definitions common to both the streaming classes ( QCborStreamReader and QCborStreamWriter ) and to QCborValue .

See also

QCborError

This enum contains a list of CBOR tags, known at the time of the Qt implementation. This list is not meant to be complete and contains only tags that are either backed by an RFC or specifically used by the Qt implementation.

The authoritative list is maintained by IANA in the CBOR tag registry .

Constant	Description
QCborKnownTags.DateTimeString	A date and time string, formatted according to RFC 3339, as refined by RFC 4287. It is the same format as ISODate and ISODateWithMs .
QCborKnownTags.UnixTime_t	A numerical representation of seconds elapsed since 1970-01-01T00:00Z.
QCborKnownTags.PositiveBignum	A positive number of arbitrary length, encoded as a byte array in network byte order. For example, the number 2 64 is represented by a byte array containing the byte value 0x01 followed by 8 zero bytes.
QCborKnownTags.NegativeBignum	A negative number of arbitrary length, encoded as the absolute value of that number, minus one. For example, a byte array containing byte value 0x02 followed by 8 zero bytes represents the number -2 65 - 1.
QCborKnownTags.Decimal	A decimal fraction, encoded as an array of two integers: the first is the exponent of the power of 10, the second the integral mantissa. The value 273.15 would be encoded as array [-2, 27315].
QCborKnownTags.Bigfloat	Similar to Decimal, but the exponent is a power of 2 instead.
QCborKnownTags.COSE_Encrypt0	An Encrypt0 map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.COSE_Mac0	A Mac0 map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.COSE_Sign1	A Sign1 map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.ExpectedBase64url	Indicates that the byte array should be encoded using Base64url if the stream is converted to JSON.
QCborKnownTags.ExpectedBase64	Indicates that the byte array should be encoded using Base64 if the stream is converted to JSON.
QCborKnownTags.ExpectedBase16	Indicates that the byte array should be encoded using Base16 (hex) if the stream is converted to JSON.
QCborKnownTags.EncodedCbor	Indicates that the byte array contains a CBOR stream.
QCborKnownTags.Url	Indicates that the string contains a URL.
QCborKnownTags.Base64url	Indicates that the string contains data encoded using Base64url.
QCborKnownTags.Base64	Indicates that the string contains data encoded using Base64.
QCborKnownTags.RegularExpression	Indicates that the string contains a Perl-Compatible Regular Expression pattern.
QCborKnownTags.MimeMessage	Indicates that the string contains a MIME message (according to RFC 2045).
QCborKnownTags.Uuid	Indicates that the byte array contains a UUID.
QCborKnownTags.COSE_Encrypt	An Encrypt map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.COSE_Mac	A Mac map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.COSE_Sign	A Sign map as specified by RFC 8152 (CBOR Object Signing and Encryption).
QCborKnownTags.Signature	No change in interpretation; this tag can be used as the outermost tag in a CBOR stream as the file header.

The following tags are interpreted by QCborValue during decoding and will produce objects with extended Qt types, and it will use those tags when encoding the same extended types.

Constant	Description
QCborKnownTags.DateTimeString	QDateTime
QCborKnownTags.UnixTime_t	QDateTime (only in decoding)
QCborKnownTags.Url	QUrl
QCborKnownTags.Uuid	QUuid

Additionally, if a QCborValue containing a QByteArray is tagged using one of ExpectedBase64url, ExpectedBase64 or ExpectedBase16, QCborValue will use the expected encoding when converting to JSON (see toJsonValue ).

See also

QCborTag append(QCborTag) isTag() toTag() isTag() tag()

This enum contains the possible “Simple Types” for CBOR. Simple Types range from 0 to 255 and are types that carry no further value.

The following values are currently known:

Constant	Description
QCborSimpleType.False	A “false” boolean.
QCborSimpleType.True	A “true” boolean.
QCborSimpleType.Null	Absence of value (null).
QCborSimpleType.Undefined	Missing or deleted value, usually an error.

Qt CBOR API supports encoding and decoding any Simple Type, whether one of those above or any other value.

Applications should only use further values if a corresponding specification has been published, otherwise interpretation and validation by the remote may fail. Values 24 to 31 are reserved and must not be used.

The current authoritative list is maintained by IANA in the Simple Values registry .

See also

append(QCborSimpleType) isSimpleType() toSimpleType() isSimpleType() toSimpleType()

This enum contains no enumeration and is used only to provide type-safe access to a CBOR tag.

CBOR tags are 64-bit numbers that are attached to generic CBOR types to provide further semantic meaning. may be constructed from an enumeration found in QCborKnownTags or directly by providing the numeric representation.

For example, the following creates a QCborValue containing a byte array tagged with a tag 2.

QCborValue(QCborTag(2), QByteArray("\x01\0\0\0\0\0\0\0\0", 9))

See also

QCborKnownTags append(QCborTag) isTag() toTag() isTag() tag()