Wireshark-bugs: [Wireshark-bugs] [Bug 13073] s7comm.blockinfo.blocktype JSON output format value
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 31 Oct 2016 06:47:27 +0000

Comment # 1 on bug 13073 from 
The block type string consists of an ASCII SOH character (with the code 0x01)
followed by an ASCII NUL character (with the code 0x00).

RFC 7159, "The _javascript_ Object Notation (JSON) Data Interchange Format",
section 7:

    https://tools.ietf.org/html/rfc7159#section-7

says:

7.  Strings

   The representation of strings is similar to conventions used in the C
   family of programming languages.  A string begins and ends with
   quotation marks.  All Unicode characters may be placed within the
   quotation marks, except for the characters that must be escaped:
   quotation mark, reverse solidus, and the control characters (U+0000
   through U+001F).

   Any character may be escaped.  If the character is in the Basic
   Multilingual Plane (U+0000 through U+FFFF), then it may be
   represented as a six-character sequence: a reverse solidus, followed
   by the lowercase letter u, followed by four hexadecimal digits that
   encode the character's code point.  The hexadecimal letters A though
   F can be upper or lower case.  So, for example, a string containing
   only a single reverse solidus character may be represented as
   "\u005C".

So the correct representation for that value would be "\u0001", and the bug is
that we're only outputting 3 digits, not four digits.

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