#!/usr/bin/ruby -w
# Generate binary data with repeating blocks that are near the size of
# our maximum match length.

# Set fixed seed for deterministic output.
srand(1)

# Generate a block all unique bytes.
base_block = (0..255).to_a

# Double this block so that we can slice more than 256 elements from it.
base_block += base_block

# Generate random blocks of varying lengths that can't be compressed,
# and output each block a few times.
(252..258).each{|s|
   print base_block.shuffle[0..s].map{|c| c.chr}.join("") * 3
}

# Generate a set of short random blocks.
blocks = []
(49..53).each{|s|
   blocks += [base_block.shuffle[0..s].map{|c| c.chr}.join("")]
}

# Output all block permutations.
blocks.permutation.each{|p| print p.join("") }