[Tcllib-bugs] [Tcllib] (anonymous) tkt (Open): "crc32 -filename $name" end in error on files with special content (not encoding problem)

[<no...@tc...>]

Automated mail by fx, on behalf of no...@tc...

Ticket Change [cf2744c4d020feb157487d837b46423ccfdb4d5090f80a88ae9831402c99a810]
  ["crc32 -filename $name" end in error on files with special content (not encoding problem)]
  By      anonymous
  For     Tcllib
  On      2025-10-07T23:54:35.985
  Details https://core.tcl-lang.org/tcllib/tinfo?name=cf2744c4d020feb157487d837b46423ccfdb4d5090f80a88ae9831402c99a810
  Ticket  https://core.tcl-lang.org/tcllib/tktview/7bd2d439ca61da14a9fc5e8372e5fb1f86c28ff1

Changed Fields
  assignee:
  icomment: @Pat Thoyts or @apnadkarni:  crc32 with option "-file" should use the
            opened file using "fconfigure -encoding iso8859-1" to prevent problems
            from binary files.  Loading the files into memory (so them are all in
            unicodes from 0 to 255) and use crc32 with option "-data" brings the
            same error.  The only difference for "-file" is the not closing/not
            releasing the file handle.  This may occur on Tcl 9.0 by reading
            binary codes in the file which can not decoded.  As Uli E. stated, it
            may be work-around using the not documented option "-chunksize".  But
            for really large files/data this is not the solution alone.  The
            problem occurs on combining the crc32 result for each chunk.  Maybe
            for Tcl 9.0 there is a need for another sign-handling?  Additionally,
            with the error "integer value too large to represent" the handle for
            option -file is leaved open too.  Because both named (examples) files
            are in correct (strict) encoding,  the calculation is the first part,
            the correct fconfigure the second part, and  try-catch errors to
            finally close the opened file the third part to be resolved.  As
            mentioned, the same may be necessary for crc16, cksum and sum too!
  login:    anonymous
  username: [TWu]

------------------------------------------------------------
See Tcl/Tk development @ http://core.tcl-lang.org/
------------------------------------------------------------