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The base64 encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. A 65-character subset ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per printable character. The following primary functions are provided: =over 4 =item encode_base64( $bytes ) =item encode_base64( $bytes, $eol ); Encode data by calling the encode_base64() function. The first argument is the byte string to encode. The second argument is the line-ending sequence to use. It is optional and defaults to "\n". The returned encoded string is broken into lines of no more than 76 characters each and it will end with $eol unless it is empty. Pass an empty string as second argument if you do not want the encoded string to be broken into lines. The function will croak with "Wide character in subroutine entry" if $bytes contains characters with code above 255. The base64 encoding is only defined for single-byte characters. Use the Encode module to select the byte encoding you want. =item decode_base64( $str ) Decode a base64 string by calling the decode_base64() function. This function takes a single argument which is the string to decode and returns the decoded data. Any character not part of the 65-character base64 subset is silently ignored. Characters occurring after a '=' padding character are never decoded. =back If you prefer not to import these routines into your namespace, you can call them as: use MIME::Base64 (); $encoded = MIME::Base64::encode($decoded); $decoded = MIME::Base64::decode($encoded); Additional functions not exported by default: =over 4 =item encode_base64url( $bytes ) =item decode_base64url( $str ) Encode and decode according to the base64 scheme for "URL applications" [1]. This is a variant of the base64 encoding which does not use padding, does not break the string into multiple lines and use the characters "-" and "_" instead of "+" and "/" to avoid using reserved URL characters. =item encoded_base64_length( $bytes ) =item encoded_base64_length( $bytes, $eol ) Returns the length that the encoded string would have without actually encoding it. This will return the same value as C<< length(encode_base64($bytes)) >>, but should be more efficient. =item decoded_base64_length( $str ) Returns the length that the decoded string would have without actually decoding it. This will return the same value as C<< length(decode_base64($str)) >>, but should be more efficient. =back =head1 EXAMPLES If you want to encode a large file, you should encode it in chunks that are a multiple of 57 bytes. This ensures that the base64 lines line up and that you do not end up with padding in the middle. 57 bytes of data fills one complete base64 line (76 == 57*4/3): use MIME::Base64 qw(encode_base64); open(FILE, "/var/log/wtmp") or die "$!"; while (read(FILE, $buf, 60*57)) { print encode_base64($buf); } or if you know you have enough memory use MIME::Base64 qw(encode_base64); local($/) = undef; # slurp print encode_base64(); The same approach as a command line: perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' and Joerg Reichelt and code posted to comp.lang.perl <3pd2lp$6gf@wsinti07.win.tue.nl> by Hans Mulder The XS implementation uses code from metamail. Copyright 1991 Bell Communications Research, Inc. (Bellcore) =head1 SEE ALSO L [1] L =cut