Re: Aw: Re: Do you know a tool to decode "UTF-8 twice"

Markus Scherer <markus.icu_at_gmail.com> wrote:
 |Does "iconv -f utf8 -t latin1 < ${i} | iconv -f utf8 -t utf8" not work? It
 |decodes one layer of UTF-8 and tests if the result is still in UTF-8, that
 |seems right, and should work for all of Unicode.

It does work for

  ÄEIÖÜ
  ①
  𐇐
  𝄢
  🀂
  𐂂

but the error channel should possibly be suppressed all along the
way, as in

  FILE=some-file.txt
  (set +e;
  cat ${FILE} |
  iconv -f utf8 -t latin1 2>&1 |
  iconv -f utf8 -t utf8 >/dev/null 2>&1 &&
  echo It is likely that the file ${FILE} is encoded twice)

I mean, having a nice plain little C tool which simply iterates
over the data and checks for the two-octet sequences that encoding
UTF-8 into UTF-8 produces, checking the resulting sequences, too,
and only replacing original input with such decoded output if at
the end of the day the file consisted of at least one such
sequence would also be nice.

(At least it would integrate better into my workflow than
some graphical JAVA ©® written by assembler-aware beautes :))

 |markus

--steffen
Received on Tue Oct 29 2013 - 05:12:22 CDT