Base64ToString (String function)

Convert a base 64 string to Ebcdic (String class)

Base64ToString is and intrinsic function returns the unencoded value of a base-64 encoded string.

Syntax

%outString = string:Base64ToString Throws InvalidBase64Data

Syntax terms

%string	A string variable to receive the unencoded value of the method object string.
string	A Base64-encoded string value.

Exceptions

Base64ToString can throw the following exceptions:

InvalidBase64data

If the method object string does not contain a properly encoded base64 value. The exception object indicates the position of the first invalid character in the method object string.

Usage notes

• Base-64 encoding is useful for encoding strings that might contain binary or other characters that could cause problems in certain contexts. For example, binary characters can be problematic when sent in e-mail.

  Base-64 encoding is an alternative to hexadecimal encoding. Hexadecimal encoding has the advantage that it's simpler, but it has the disadvantage that it requires two bytes for every encoded byte. Base-64 encoding, because it uses more characters (64, as the name would suggest), only requires four bytes for every three encoded bytes.

• A complete explanation of base-64 encoding can be easily found on the internet or in many software textbooks.
• The Base64ToString function accepts both the standard base64 encoding (where the encoded string is padded out to an even multiple of four bytes by adding trailing equals signs) and a non-standard encoding (where no trailing equals signs are added and the encoded string might not be an exact multiple of four bytes).
• Base64ToString is available as of Sirius Mods version 7.2.

Examples

1. The following statement displays 'Sleeping Bear':

   printText {'4pOFhZeJlYdAwoWBmQ==':base64toString}

See also

• The inverse of Base64ToString is StringToBase64.
• For details of the printtext statement, please see printText

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