How to append BOM at the beginning of a binary

Hi,

perl -p -i -e 'BEGIN { printf "%c%c%c", 0xEF, 0xBB, 0xBF }' default.xml
perl -p -i -e 'BEGIN { print pack "c3", 0xEF, 0xBB, 0xBF }' default.xml

Both give the same error:

Can't find string terminator "'" anywhere before EOF at -e line 1.

Is it because of Windows CMD? How to get it work?

Tamas Nagy

On 6/8/15 3:58 AM, Nagy Tamas (TVI-GmbH) wrote:
> Hi,
> 
> "perl -p -i -e 'BEGIN {print %x "EFBBBF" }' default.xml Can't find 
> string terminator "'" anywhere before EOF at -e line 1."
> Can't find string terminator "'" anywhere before EOF at -e line 1.
> 
> How to do it with this PERL line?
> 
> %x prints hexa, but it does not work. 
> 

1. The "%x" conversion takes an integer and outputs characters
   representing hexadecimal.  That's almost the opposite of what
   would be required to output the three bytes of a UTF-8 BOM.

2. A format string, which includes the "%x" conversion, is 
   supported by printf, not print.

   Here are two ways that you could write the above:

    perl -p -i -e 'BEGIN { printf "%c%c%c", 0xEF, 0xBB, 0xBF }' default.xml

    perl -p -i -e 'BEGIN { print pack "c3", 0xEF, 0xBB, 0xBF }' default.xml

3. None of this is necessary.  Most applications assume XML files
   use UTF-8 encoding, without a BOM.  The use of a BOM for UTF-8
   is NOT recommended by the Unicode standard and could cause
   problems downstream.

4. Placing the UTF-8 BOM at the beginning of a file does not 
   guarantee that the content of the file is actually encoded as
   UTF-8.  It just tells downstream applications to decode it
   assuming that it is UTF-8.  For this reason, the use of a BOM
   is particularly unwise for XML, because it would override the
   encoding specified in the XML declaration.

5. None of this will solve your original problem, which had to do
   with CRLF (0D,0A) pairs embedded in the value strings in the XML.
   That problem has nothing to do with whether you use UTF encoding
   or not, nor whether your file has a BOM at the beginning or not.

--
David Thomas
Sugar Land, Texas
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