$Lstr Base64 Decode

Convert from base 64 to byte string

Note: Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Lstr_Base64_Decode function is the Base64ToString function.

This function converts from a base 64 encoded string to the decoded byte string. It is identical to $Base64_Decode, except it is longstring capable.

The $Lstr_Base64_Decode function accepts one argument and returns a string result whose base 64 encoding is that argument.

The first argument is a longstring which is a base 64 encoding.

The returned value is the base 64 decoding of the argument string. If the argument is not a valid base 64 encoding, the null string is returned.

Syntax

%DECODED = $Lstr_Base64_Decode(string)

%DECODED is set to the base 64 decoding of string.

Usage notes

• You can check for an invalid base 64 encoding by checking for the null string return value from $Lstr_Base64_Decode. Of course, if it is possible that the argument is null, the null string is a valid returned value. If you need to check for errors, and the null string is a possible argument value, you can use an approach such as the following:

  %STR = $Lstr_Base64_Decode(%IN) IF %STR EQ '' IF %IN NE '' THEN error code ... END IF END IF

• $Lstr_Base64_Encode is the inverse of $Lstr_Base64_Decode.

Example

Given the following argument of length 4:

%JUNK = $Lstr_Base64_Decode('ABCD')

%JUNK is set to the byte string (of length 3) represented in hexadecimal as X'001083'.

Products authorizing $Lstr_Base64_Decode

• Sirius functions
• Fast/Unload User Language Interface
• Janus Open Client
• Janus Open Server
• Janus Sockets
• Janus Web Server
• Japanese functions
• [[Media:SirfieldNew.pdf|Sir2000 Field Migration Facility]