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package Encode::UTF8::Slow; |
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13710
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use strict; |
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use Encode 'encode'; |
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use Exporter 'import'; |
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our $VERSION = 0.01; |
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our @EXPORT_OK = qw/bytes_to_codepoint codepoint_to_bytes/; |
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# utf8 handling per RFC 3629 |
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# Char. number range | UTF-8 octet sequence |
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# (hexadecimal) | (binary) |
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# --------------------+------------------------------------ |
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# 0000 0000-0000 007F | 0xxxxxxx |
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# 0000 0080-0000 07FF | 110xxxxx 10xxxxxx |
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# 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx |
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# 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx |
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sub codepoint_to_bytes { |
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my $codepoint = shift; |
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100
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if ($codepoint < 0x80) { |
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100
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return pack 'C', $codepoint; |
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} |
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elsif ($codepoint < 0x800) { |
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return pack 'CC', |
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$codepoint >> 6 | 0b11000000, |
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$codepoint & 0b00111111 | 0b10000000; |
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} |
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elsif ($codepoint < 0x10000) { |
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return pack 'CCC', |
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$codepoint >> 12 | 0b11100000, |
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$codepoint >> 6 & 0b00111111 | 0b10000000, |
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$codepoint & 0b00111111 | 0b10000000; |
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} |
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else { |
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return pack 'CCCC', |
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$codepoint >> 18 | 0b11110000, |
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$codepoint >> 12 & 0b00111111 | 0b10000000, |
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$codepoint >> 6 & 0b00111111 | 0b10000000, |
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$codepoint & 0b00111111 | 0b10000000; |
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} |
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} |
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sub bytes_to_codepoint { |
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# treat the scalar as bytes/octets |
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1
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899
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my $input = encode('UTF-8', shift); |
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# length returns number of bytes |
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my $len = length $input; |
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my $template = 'C' x $len; |
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my @bytes = unpack $template, $input; |
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# reverse encoding |
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100
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if ($len == 1) { |
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100
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100
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return $bytes[0]; |
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} |
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elsif ($len == 2) { |
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2
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return (($bytes[0] & 0b00011111) << 6) + |
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($bytes[1] & 0b00111111); |
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} |
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elsif ($len == 3) { |
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return (($bytes[0] & 0b00001111) << 12) + |
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(($bytes[1] & 0b00111111) << 6) + |
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( $bytes[2] & 0b00111111); |
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} |
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else { |
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2
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return (($bytes[0] & 0b00000111) << 18) + |
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(($bytes[1] & 0b00111111) << 12) + |
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(($bytes[2] & 0b00111111) << 6) + |
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($bytes[3] & 0b00111111); |
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} |
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} |
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1; |
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__END__ |