B64_samp.exe is a sample that shows how to programmatically encode and
decode Base 64 encoding mechanism. This encoding mechanism was introduced
for use with Multipurpose Internet Mail Extensions (MIME). It is the
default mechanism used when authenticating in clear text (Basic
Authentication) between a Web browser and a Web server.
The sample is in the form of a simple Win32 command line application. Usage
is as follows:
Usage: Base64.exe -[d|e] <message>
d : Decode <message>
e : Encode <message>
The sample does not format the encoded text. The RFC specifications for
Base 64 requires that each line of the encoded message not be greater than
76 characters. After 76 characters, the message must have a hard line break
inserted (that is, carriage return + line feed). Furthermore, the encoded
message when fed into a decoder must be padded so that the total number of
characters be divisible by 4. The decoder sample included with this file
will handle situations where the padding is missing. The encoded message
should be padded with an equal sign character (=) at the end. Please refer
to section 5.2 of RFC 1521 for more detailed description of the Base 64
NOTE: The sample includes the project files for Microsoft Visual C++ 5.0.
For other development environments, simply copy over the .cpp/.h files into
your own project. Note that the self-extracting executable is a Win32 EXE.
The following files are available for download from the Microsoft
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
How to Obtain Microsoft Support Files from Online Services
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RFC 1521 : MIME (Multipurpose Internet Mail Extensions) Part One:
Mechanisms for Specifying and Describing the Format of Internet Message