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CBOR
Concise Binary Object Representation (CBOR) is a binary data serialization format loosely based on JSON authored by Carsten Bormann and Paul Hoffman. Like JSON it allows the transmission of data objects that contain name–value pairs, but in a more concise manner. This increases processing and transfer speeds at the cost of human readability. It is defined in IETF RFC 8949.
Amongst other uses, it is the recommended data serialization layer for the CoAP Internet of Things protocol suite[failed verification] and the data format on which COSE messages are based. It is also used in the Client-to-Authenticator Protocol (CTAP) within the scope of the FIDO2 project.
CBOR was inspired by MessagePack, which was developed and promoted by Sadayuki Furuhashi. CBOR extended MessagePack, particularly by allowing to distinguish text strings from byte strings, which was implemented in 2013 in MessagePack.
CBOR encoded data is seen as a stream of data items. Each data item consists of a header byte containing a 3-bit type and 5-bit short count. This is followed by an optional extended count (if the short count is in the range 24–27), and an optional payload.
For types 0, 1, and 7, there is no payload; the count is the value. For types 2 (byte string) and 3 (text string), the count is the length of the payload. For types 4 (array) and 5 (map), the count is the number of items (pairs) in the payload. For type 6 (tag), the payload is a single item and the count is a numeric tag number which describes the enclosed item.
Each data item's behaviour is defined by the major type and count. The major type is used for selecting the main behaviour or type of each data item.
The 5-bit short count field encodes counts 0–23 directly. Short counts of 24–27 indicate the count value is in a following 8, 16, 32 or 64-bit extended count field. Values 28–30 are not assigned and must not be used.
Types are divided into "atomic" types 0–1 and 6–7, for which the count field encodes the value directly, and non-atomic types 2–5, for which the count field encodes the size of the following payload field.
Hub AI
CBOR AI simulator
(@CBOR_simulator)
CBOR
Concise Binary Object Representation (CBOR) is a binary data serialization format loosely based on JSON authored by Carsten Bormann and Paul Hoffman. Like JSON it allows the transmission of data objects that contain name–value pairs, but in a more concise manner. This increases processing and transfer speeds at the cost of human readability. It is defined in IETF RFC 8949.
Amongst other uses, it is the recommended data serialization layer for the CoAP Internet of Things protocol suite[failed verification] and the data format on which COSE messages are based. It is also used in the Client-to-Authenticator Protocol (CTAP) within the scope of the FIDO2 project.
CBOR was inspired by MessagePack, which was developed and promoted by Sadayuki Furuhashi. CBOR extended MessagePack, particularly by allowing to distinguish text strings from byte strings, which was implemented in 2013 in MessagePack.
CBOR encoded data is seen as a stream of data items. Each data item consists of a header byte containing a 3-bit type and 5-bit short count. This is followed by an optional extended count (if the short count is in the range 24–27), and an optional payload.
For types 0, 1, and 7, there is no payload; the count is the value. For types 2 (byte string) and 3 (text string), the count is the length of the payload. For types 4 (array) and 5 (map), the count is the number of items (pairs) in the payload. For type 6 (tag), the payload is a single item and the count is a numeric tag number which describes the enclosed item.
Each data item's behaviour is defined by the major type and count. The major type is used for selecting the main behaviour or type of each data item.
The 5-bit short count field encodes counts 0–23 directly. Short counts of 24–27 indicate the count value is in a following 8, 16, 32 or 64-bit extended count field. Values 28–30 are not assigned and must not be used.
Types are divided into "atomic" types 0–1 and 6–7, for which the count field encodes the value directly, and non-atomic types 2–5, for which the count field encodes the size of the following payload field.