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base64.pl -- Base64 encoding and decoding
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Prolog-based base64 encoding using DCG rules. Encoding according to rfc2045. For example:

1 ?- base64('Hello World', X).
X = 'SGVsbG8gV29ybGQ='.

2 ?- base64(H, 'SGVsbG8gV29ybGQ=').
H = 'Hello World'.

The Base64URL encoding provides a URL and file name friendly alternative to base64. Base64URL encoded strings do not contain white space.

author
- Jan Wielemaker
To be done
- Stream I/O
- White-space introduction and parsing
Source base64_encoded(+Plain, -Encoded, +Options) is det
base64_encoded(-Plain, +Encoded, +Options) is det
General the base64 encoding and decoding. This predicate subsumes base64/2 and base64url/2, providing control over padding, the characters used for encoding and the output type. Options:
charset(+Charset)
Define the encoding character set to use. The (default) classic uses the classical rfc2045 characters. The value url uses URL and file name friendly characters. See base64url/2.
padding(+Boolean)
If true (default), the output is padded with = characters.
as(+Type)
Defines the type of the output. One of string (default) or atom.
Arguments:
Plain- is an atom or string containing the unencoded (plain) text.
Encoded- is an atom or string containing the base64 encoded version of Plain.
Source base64(+Plain, -Encoded) is det
base64(-Plain, +Encoded) is det
Translates between plaintext and base64 encoded atom or string. See also base64//1.
Source base64url(+Plain, -Encoded) is det
base64url(-Plain, +Encoded) is det
Translates between plaintext and base64url encoded atom or string. Base64URL encoded values can safely be used as URLs and file names. The use "-" instead of "+", "_" instead of "/" and do not use padding. This implies that the encoded value cannot be embedded inside a longer string.
Source base64_encoded(+PlainText, +Options)// is det
base64_encoded(-PlainText, +Options)// is det
Source base64(+PlainText)// is det
base64(-PlainText)// is det
Encode/decode list of character codes using base64. See also base64/2.
Source base64url(+PlainText)// is det
base64url(-PlainText)// is det
Encode/decode list of character codes using Base64URL. See also base64url/2.