This can be generalised for other orderings of the bytes, and of the bits in each byte, of the bitstring. Four types of bitstring can be identified:

  1. big-endian: ms-bit of first byte is the ms-bit of the multi-byte number. This is handled as shown, ie:

      my $h = unpack( 'H*', $bitstring ) ;

    [download]

  2. little-endian: ls-bit of first byte is the ls-bit of the multi-byte number. This is handled:

      my $h = unpack( 'H*', scalar reverse $bitstring ) ;

    [download]
    Note that this is the same order as vec($v, $b, 1)

  3. big-endian reversed bytes: ls-bit of first byte is the ms-bit of the multi-byte number. This is handled:

      my $h = unpack( 'H*', pack('b*', unpack('B*', $bitstring)) ) ;

    [download]

  4. little-endian reversed bytes: ms-bit of first byte is the ls-bit of the multi-byte number. This is handled:

      my $h = unpack( 'H*', pack('b*', unpack('B*', scalar reverse $bitstr
+ing)) ) ;

    [download]

In reply to Re: Answer: How do I convert a very long bit string into a number? by gone2015
in thread How do I convert a very long bit string into a number? by jdporter

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