binary - Insert and extract fields from binary strings

(Dissect and join binary data into/from tcl values)

'''[binary format]''' ''formatString ?arg arg ...?''

'''[binary scan]''' ''string formatString ?varName varName ...?''

http://purl.org/tcl/home/man/tcl8.4/TclCmd/binary.htm

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This is the primary command to use when [Working with binary data].

For dealing with binary data on C level see also http://www.tcl.tk/man/tcl8.4/TclLib/ByteArrObj.htm

See [Binary representation of numbers] for an example of usage.

What are the issues when dealing with special values - 64 bits for instance?

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See also:

   * [format]
   * [scan]

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'''Examples'''

In a conversation in the Tcl'ers Chat about how to display the bits in a number [DKF] came up with this:
 binary scan [binary format I $value] B32 x; set x

[GPS]: I use the following string to/from hex conversion procedures to store files that may contain special characters that intefere with the OS filesystem in my [Grindweb] program:

 proc convert.string.to.hex str {
  binary scan $str H* hex 
  return $hex
 }

 proc convert.hex.to.string hex {
  foreach c [split $hex ""] { 
   if {![string is xdigit $c]} {
    return "#invalid $hex"
   }
  }
  binary format H* $hex
 }
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