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This archive contains an OS4 PPC version of the base64 tool. This tool encodes/decodes files in the "Base64" format used by MIME-encoded documents such as electronic mail messages with embedded images and audio files. Source code used for this build was obtained from the authors homepage at http://www.fourmilab.ch/. -- Martin McKenzie email: marty()cadtechnologies.co.uk web: http://www.cadtechnologies.co.uk *************************************************************************** NAME base64 - encode and decode base64 files SYNOPSIS base64 [ -d / -e ] [ options ] [ infile ] [ outfile ] DESCRIPTION The MIME (Multipurpose Internet Mail Extensions) specification (RFC 1341 and successors) defines a mechanism for encoding arbitrary binary information for transmission by electronic mail. Triplets of 8-bit octets are encoded as groups of four characters, each representing 6 bits of the source 24 bits. Only characters present in all variants of ASCII and EBCDIC are used, avoiding incompatibilities in other forms of encoding such as uuencode/uudecode. base64 is a command line utility which encodes and decodes files in this format. It can be used within a pipeline as an encoding or decoding filter, and is most commonly used in this manner as part of an automated mail processing system. OPTIONS -d, Decodes the input, previously created by base64, to recover the original input file. -e, Encodes the input into an output text file containing its base64 encoding. -n, --noerrcheck Suppress error checking when decoding. By default, upon encountering a non white space character which does not belong to the base64 set, or discovering the input file is incorrectly padded to a multiple of four characters, base64 issues an error message and terminates processing with exit status 1. The -n option suppresses even this rudimentary error checking; invalid characters are silently ignored and the output truncated to the last three valid octets if the input is incorrectly padded. -u, -? Print how to call information and a summary of options. LIMITATIONS Little or no error checking is done when decoding, other than validating that the input consists of a multiple of four characters in the encoding set. This is inherent in the design of base64, which assumes transmission integrity is the responsibility of a higher-level protocol. *************************************************************************** |
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