BASE64 DECODE

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4D v20 R7

BASE64 DECODE


BASE64 DECODE ( toDecode {; decoded}{; *} )

Parameter	Type	Description
toDecode	Text, BLOB	Encoded value to decode
		Decoded value (if decoded parameter omitted)
decoded	Text, BLOB	Decoded value
*	Operator	Decode in Base64URL format

Description

The BASE64 DECODE command decodes the text or blob value coded in Base64 or Base64URL format passed in the toDecode parameter. For more information on Base64 and Base64URL formats, please refer to the BASE64 ENCODE command description.

Pass in toDecode the Base64 or Base64URL encoded text or blob value to decode.

If you pass the decoded parameter, the command decodes the contents of toDecode in the decoded parameter -- the toDecode parameter is left untouched. If you omit the decoded parameter, the command directly modifies the contents of the toDecode parameter.

Note: If a text variable is passed to receive what is decoded by the command, it receives the decoded bytes interpreted as utf-8.

By default if the * parameter is omitted, the command uses a Base64 decoding. If you pass the * parameter, the command uses a Base64URL decoding.

If toDecode contains an invalid base64 contents, an empty text or blob value is returned.

Example

This example lets you transfer a picture via a BLOB:

 C_BLOB($sourceBlob)

 C_PICTURE($mypicture)

 $mypicture:=[people]photo

 PICTURE TO BLOB($mypicture;$sourceBlob;".JPG")

 C_TEXT($base64Text)

 BASE64 ENCODE($sourceBlob;$base64Text) //Encoding of text

  // the binary is now available as character strings in $base64Text

 

 C_TEXT($base64Text)

 C_BLOB($targetBlob)

 BASE64 DECODE($base64Text;$targetBlob) //Decoding of text

  // the binary encoded in base 64 is now available as a BLOB in $blobTarget