Thanks for the suggestion:

Working within Math::BigInt, it is easy to make the integer by prepending the string with '0b'. Then, between Math::Base85 and Math::BigInt, it is easy to go back and forth, though one needs to prepend '0's after the decoding to get back to the original length. 

use Math::Base85 qw(from_base85 to_base85);

$str = '0b000000010010001101000101011001111000100110101011110011011110
+1111';

$bint = Math::BigInt->new($str);
$b85str = to_base85($bint);
$bint2 = from_base85($b85str);
print $bint2->as_bin();

[download]
This does exactly what I want now. And I get slightly more efficiency than with base64.

-albert

In reply to Re^2: Binary string to base64 by albert
in thread Binary string to base64 by albert

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