Prevent bc from auto truncating leading zeros when converting from hex to binary

I'm trying to convert a hex string to binary. I'm using:

echo "ibase=16; obase=2; $line" | BC_LINE_LENGTH=9999 bc

It is truncating the leading zeroes. That is, if the hex string is 4F, it is converted to 1001111 and if it is 0F, it is converted to 1111. I need it to be 01001111 and 00001111

What can I do?

bash bc

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Prevent bc from auto truncating leading zeros when converting from hex to binary

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