[Cbor] [Errata Held for Document Update] RFC8610 (6527)
RFC Errata System <rfc-editor@rfc-editor.org> Fri, 23 April 2021 15:29 UTC
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Subject: [Cbor] [Errata Held for Document Update] RFC8610 (6527)
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The following errata report has been held for document update for RFC8610, "Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures". -------------------------------------- You may review the report below and at: https://www.rfc-editor.org/errata/eid6527 -------------------------------------- Status: Held for Document Update Type: Technical Reported by: Sean Bartell <smbarte2@illinois.edu> Date Reported: 2021-04-11 Held by: Francesca Palombini (IESG) Section: B Original Text ------------- text = %x22 *SCHAR %x22 SCHAR = %x20-21 / %x23-5B / %x5D-7E / %x80-10FFFD / SESC SESC = "\" (%x20-7E / %x80-10FFFD) Corrected Text -------------- SESC = "\" ( %x22 / "/" / "\" / ; \" \/ \ %x62 / %x66 / %x6E / %x72 / %x74 / ; \b \f \n \r \t (%x75 hexchar) ) ; \u hexchar = non-surrogate / (high-surrogate "\" %x75 low-surrogate) non-surrogate = ((DIGIT / "A"/"B"/"C" / "E"/"F") 3HEXDIG) / ("D" %x30-37 2HEXDIG ) high-surrogate = "D" ("8"/"9"/"A"/"B") 2HEXDIG low-surrogate = "D" ("C"/"D"/"E"/"F") 2HEXDIG Notes ----- As discussed during the CBOR interim 2021-04-21 and in the mailing list: https://mailarchive.ietf.org/arch/msg/cbor/ljHAiw-WhNqoIKAzkjZa4WIf56Q/ -- The ABNF used in [RFC8610] for the content of text string literals is rather permissive: text = %x22 *SCHAR %x22 SCHAR = %x20-21 / %x23-5B / %x5D-7E / %x80-10FFFD / SESC SESC = "\" (%x20-7E / %x80-10FFFD) This allows almost any non-C0 character to be escaped by a backslash, but critically misses out on the \uXXXX and \uHHHH\uLLLL forms that JSON allows to specify characters in hex. Both can be solved by updating the SESC production to: SESC = "\" ( %x22 / "/" / "\" / ; \" \/ \ %x62 / %x66 / %x6E / %x72 / %x74 / ; \b \f \n \r \t (%x75 hexchar) ) ; \u hexchar = non-surrogate / (high-surrogate "\" %x75 low-surrogate) non-surrogate = ((DIGIT / "A"/"B"/"C" / "E"/"F") 3HEXDIG) / ("D" %x30-37 2HEXDIG ) high-surrogate = "D" ("8"/"9"/"A"/"B") 2HEXDIG low-surrogate = "D" ("C"/"D"/"E"/"F") 2HEXDIG Now that SESC is more restrictively formulated, this also requires an update to the BCHAR production used in the ABNF syntax for byte string literals: bytes = [bsqual] %x27 *BCHAR %x27 BCHAR = %x20-26 / %x28-5B / %x5D-10FFFD / SESC / CRLF bsqual = "h" / "b64" The updated version explicit allows \', which is no longer allowed in the updated SESC: BCHAR = %x20-26 / %x28-5B / %x5D-10FFFD / SESC / "\'" / CRLF -------------------------------------- RFC8610 (draft-ietf-cbor-cddl-08) -------------------------------------- Title : Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures Publication Date : June 2019 Author(s) : H. Birkholz, C. Vigano, C. Bormann Category : PROPOSED STANDARD Source : Concise Binary Object Representation Maintenance and Extensions Area : Applications and Real-Time Stream : IETF Verifying Party : IESG
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