Hello fellow monks

I have a sequence of bits that I want to convert back into actual values. I found a working algorithm, but there's probably an easier way to achieve what I want.

Input format: 0 and 1's in big-endian order. The number of bits may or may not equal multiples of 8.

Output format: Convert all groups of 8 into actual value, remaining bits must be kept. (Converted values can be any ASCII value, UTF-8 is not relevant.)

Sample script

#!/usr/bin/perl

use strict;
use warnings;

# store 'A' and 'B' as a bitstream
# (bit groups are stored big endian!)
my @bits = (
  1, 0, 0, 0, 0, 0, 1, 0,   # A / 0x41 / 0b01000001
  0, 1, 0, 0, 0, 0, 1, 0,   # B / 0x42 / 0b01000010
  1, 1, 0, 0, 1, 0, 1       # incomplete byte
);

my $data;
while (@bits >= 8) {
  # fetch bit group
  my @eightbits_be = splice @bits, 0, 8;
  # convert to little endian
  my @eightbits_le = reverse @eightbits_be;
  # generate binary representation 
  my $binary       = '0b' . join q{}, @eightbits_le;
  # convert binary representation into actual value
  my $value = chr oct $binary;

  $data .= $value;
}

printf "data: %s\n", $data;                # AB
printf "bits: %s\n", join ', ', @bits;     # 1, 1, 0, 0, 1, 0, 1

[download]
The generated/exprected output is: 
data: AB
bits: 1, 1, 0, 0, 1, 0, 1

In reply to Optimize bit stream conversion by Monk::Thomas

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