$Lstr Base64 Decode: Difference between revisions

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<span class="pageSubtitle">Convert from base 64 to byte string</span>
<span class="pageSubtitle">Convert from base 64 to byte string</span>


<p class="warning">Most Sirius $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Lstr_Base64_Decode function is the [[Base64ToString (String function)]].</p>
<p class="warn"><b>Note: </b>Many $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Lstr_Base64_Decode function is the <var>[[Base64ToString (String function)|Base64ToString]]</var> function.</p>


This function converts from a base 64 encoded string to the decoded byte string. It is identical to [[$Base64_Decode]], except it is longstring capable.  
This function converts from a base 64 encoded string to the decoded byte string. It is identical to [[$Base64_Decode]], except it is longstring capable.  
Line 18: Line 18:
<p>%DECODED is set to the base 64 decoding of <var class="term">string</var>.</p>
<p>%DECODED is set to the base 64 decoding of <var class="term">string</var>.</p>


For example, given the following argument of length 4:
==Usage notes==
<ul>
<li>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:


<p class="code"> %JUNK = $Lstr_Base64_Decode('ABCD')
<p class="code">%STR = $Lstr_Base64_Decode(%IN)
IF %STR EQ &apos;&apos;
  IF %IN NE &apos;&apos; THEN
      error code ...
  END IF
END IF
</p>
</p>


%JUNK is set to the byte string (of length 3) represented in hexadecimal as X'001083'.  
<li><var>[[$Lstr_Base64_Encode]]</var> is the inverse of $Lstr_Base64_Decode.  
</ul>


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:
==Example==
Given the following argument of length 4:


<p class="code"> %STR = $Lstr_Base64_Decode(%IN)
<p class="code">%JUNK = $Lstr_Base64_Decode('ABCD')
IF %STR EQ ''
    IF %IN NE '' THEN
      error code ...
    END IF
END IF
</p>
</p>


 
%JUNK is set to the byte string (of length 3) represented in hexadecimal as X'001083'.
[[$Lstr_Base64_Encode]] is the inverse of $Lstr_Base64_Decode.
 
This $function is new in Version 6.8 of the <var class="product">[[Sirius Mods]]</var>.<p>


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[[Category:$Functions|$Lstr_Base64_Decode]]
[[Category:$Functions|$Lstr_Base64_Decode]]

Latest revision as of 22:51, 20 September 2018

Convert from base 64 to byte string

Note: Many $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'.

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