FROMBASE64 Function

address = FROMBASE64(base64$, buffer, length)

The FROMBASE64 function decodes a Base64 string into a raw memory buffer.

This is useful for restoring binary data previously encoded with TOBASE64$.

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Parameters

• base64$ Base64 encoded ASCII string.
• buffer Destination memory address for decoded data.
• length Maximum size of the destination buffer.

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Return value

Returns the destination buffer address on success. Returns 0 if decoding fails.

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Example

b64$ = "AAECAwQFBgcICQ=="
 
buf = MEMALLOC(32)
 
ptr = FROMBASE64(b64$, buf, 32)
 
PRINT PEEK(ptr)
PRINT PEEK(ptr + 1)
PRINT PEEK(ptr + 2)

This decodes Base64 data into a memory buffer and reads back the first few bytes.

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Notes

• The decoded binary size may be smaller than the supplied buffer.
• The destination buffer must already exist.
• Intended for binary data handling rather than normal text strings.
• Data encoded with TOBASE64$ can be restored losslessly with this function.