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  1. PO
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    <p>First, find encoding errors, then find undesired code points.</p> <p>The latter is easy since there are Unicode properties to identify them. (See below)</p> <p>To report the errors precisely, you might want to write your own decoder to find the UTF-8 errors.</p> <pre><code>sub bytes_to_hex { join ' ', map { sprintf '%02X', $_ } unpack 'C*', $_[0] } my @errors; my @warns; my $output = ''; for ($input) { while (!/\G \z /xgc) { my $pos = pos; if (/\G ( (?: [\x00-\x7F] | [\xC0-\xDF][\x80-\xBF] | [\xE0-\xEF][\x80-\xBF]{2} | [\xF0-\xF7][\x80-\xBF]{3} | [\xF8-\xFB][\x80-\xBF]{4} | [\xFC-\xFD][\x80-\xBF]{5} ) ) /xgc) { my $bytes = $1; my @bytes = unpack 'C*', $bytes; my $hex_bytes = bytes_to_hex($bytes); if ($bytes =~ /^ (?: [\xC0-\xC1] | \xE0[\x80-\x9F] | \xF0[\x80-\x8F] | \xF8[\x80-\x87] | \xFC[\x80-\x83] ) /x) { push @warns, "Overlong encoding $hex_bytes at pos $pos"; } if ($bytes =~ /^[\xF8-\xFD]/) { push @warns, "Defunct 5 or 6 byte sequence $hex_bytes at pos $pos"; } my $code_point_ord = @bytes == 1 ? $bytes[0] : $bytes[0] &amp; ( 0x7F &gt;&gt; @bytes ); $code_point_ord = ( $code_point_ord &lt;&lt; 6 ) | ( $_ &amp; 0x3F ) for @bytes[ 1..$#bytes ]; my $code_point_hex = sprintf('U+%05X', $code_point_ord); my $code_point = chr($code_point_ord); if ($code_point_ord &gt;= 0x110000) { push @errors, "Non-Unicode $code_point_hex at pos $pos"; } else { push @warns, "Surrogate $code_point_hex at pos $pos" if $code_point =~ /\p{Cs}/; push @warns, "Private use $code_point_hex at pos $pos" if $code_point =~ /\p{Co}/; push @warns, "Unassigned $code_point_hex at pos $pos" if $code_point =~ /\p{Cn}/; $output .= $code_point; } } elsif (/\G ( (?: [\xC0-\xDF] | [\xE0-\xEF][\x80-\xBF]{0,1} | [\xF0-\xF7][\x80-\xBF]{0,2} | [\xF8-\xFB][\x80-\xBF]{0,3} | [\xFC-\xFD][\x80-\xBF]{0,4} ) ) /xgc) { my $bytes = $1; my $hex_bytes = bytes_to_hex($bytes); push @errors, "Incomplete sequence $hex_bytes at pos $pos"; } elsif (/\G ( [\x80-\xBF] ) /xgc) { my $byte = $1; my $hex_byte = bytes_to_hex($byte); push @errors, "Unexpected continuation byte $hex_byte at pos $pos"; } elsif (/\G ( [\xFE-\xFF] ) /xgc) { my $byte = $1; my $hex_byte = bytes_to_hex($byte); push @errors, "Invalid byte $hex_byte at pos $pos"; } else { die "Bug"; } } } </code></pre>
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    1. POHow can I detect and report Unicode code points that aren't legal for interchange using Perl?
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    1. USikegami
    1. USikegami
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    1. POHow can I detect and report Unicode code points that aren't legal for interchange using Perl?
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    1. COThis doesn't compile under `use strict`. It reports, `Global symbol "$code_point" requires explicit package name at ikegami.pl line 47. ikegami.pl had compilation errors.` The offending line is `my $code_point = chr($code_point);`.
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      1. USJim Monty
    2. CO@Jim Monty, Fixed. Not tested.
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      1. USikegami
    3. COCan you please explain the bit-fiddling lines? If you're just decoding bytes to UTF-8 characters, why not simply use `Encode::decode()`?
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      1. USJim Monty
 

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