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package String::BOM; |
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# use warnings; |
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# use strict; |
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$String::BOM::VERSION = '0.3'; |
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# http://www.unicode.org/faq/utf_bom.html#BOM |
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# http://search.cpan.org/perldoc?PPI::Token::BOM |
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%String::BOM::bom_types = ( |
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"\x00\x00\xfe\xff" => 'UTF-32', |
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"\xff\xfe\x00\x00" => 'UTF-32', |
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"\xfe\xff" => 'UTF-16', |
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"\xff\xfe" => 'UTF-16', |
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"\xef\xbb\xbf" => 'UTF-8', |
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); |
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sub string_has_bom { |
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if ( $_[0] =~ m/^(\x00\x00\xfe\xff|\xff\xfe\x00\x00|\xfe\xff|\xff\xfe|\xef\xbb\xbf)/s ) { |
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return $String::BOM::bom_types{$1}; |
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} |
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return; |
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} |
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sub strip_bom_from_string { |
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my $copy = $_[0]; # Modification of a read-only value attempted at ... |
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$copy =~ s/^(\x00\x00\xfe\xff|\xff\xfe\x00\x00|\xfe\xff|\xff\xfe|\xef\xbb\xbf)//s; |
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return $copy; |
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} |
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sub file_has_bom { |
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# Would rather not bring in >0.5MB Fcntl just for this so we do a read() of characters instead of a sysread() of bytes() |
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# sysopen(my $fh, $_[0],&Fcntl::O_RDONLY) or return; |
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# sysread($fh, my $buf, $length_in_bytes_of_biggest_bom); |
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open( my $fh, '<', $_[0] ) or return; |
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$! = 0; # yes this happens |
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read( $fh, my $buf, 4 ) or return; # 4 "characters" should be big enough to bring in enough anything in bom_types |
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$! = 0; # yes this happens |
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close($fh) or return; |
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$! = 0; # yes this happens |
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return string_has_bom($buf); |
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} |
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sub strip_bom_from_file { |
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if ( file_has_bom( $_[0] ) ) { |
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# there is [probabaly] a better way to do this (faster, w/ out .bak file, etc), suggestions/patches welcome |
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# in-place edit |
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my $inplace_error = 0; |
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{ |
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local $^I = '.bak'; |
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local @ARGV = ( $_[0] ); |
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local $SIG{'__WARN__'} = sub { |
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$inplace_error++; |
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# my $err = shift(); |
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# $inplace_error = { |
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# 'errno_int' => int($!), |
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# 'errno_str' => "$!", |
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# 'raw_warn' => $err, |
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# }; |
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}; |
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while () { |
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if ( $. == 1 ) { |
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print strip_bom_from_string($_); # ... write stripped line back to the file |
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next; |
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} |
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print; # ... write the line back to the file |
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} |
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} |
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return if $inplace_error; |
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unlink "$_[0].bak" unless $_[1]; |
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return 1; |
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} |
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else { |
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return if $!; # file_has_bom() must've returned false due to FS issue (hence the "yes this happens" bits above) |
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return 1; |
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} |
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} |
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sub import { |
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shift; |
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return if !@_; |
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my $caller = caller(); |
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# no strict 'refs'; |
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for (@_) { |
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next if !defined &{$_} || m/\:\'/; |
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*{"$caller\::$_"} = \&{$_}; |
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} |
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} |
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1; |
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__END__ |