#!/usr/bin/env perl
require 5.008;
use warnings;
use strict;

chdir("runlength") or die "chdir testdir failed: $!\n";

require TestDriver;

my $td = new TestDriver('runlength');

cleanup();

my @files = (
    "01",                       # basic case, ends with copy
    "02",                       # basic case, ends with run
    "03",                       # long run run
    "04",                       # ends with copy, length % 128 == 0
    "05",                       # run starts at byte 128
    "empty",                    # empty file
    );

# Create this rather than committing an empty file, which always looks
# like an error.
open(F, ">empty");
close(F);

foreach my $f (@files)
{
    $td->runtest("encode $f",
                 {$td->COMMAND => "runlength -encode $f a"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    $td->runtest("check encoded output",
                 {$td->FILE => "a"},
                 {$td->FILE => "$f.encoded"});
    $td->runtest("decode $f.encoded",
                 {$td->COMMAND => "runlength -decode $f.encoded a"},
                 {$td->STRING => "", $td->EXIT_STATUS => 0});
    $td->runtest("check decoded output",
                 {$td->FILE => "a"},
                 {$td->FILE => "$f"});
}

concatenate("01.encoded", "02.encoded", "concat.encoded");
concatenate("01", "02", "concat");

$td->runtest("decode with embedded EOD",
             {$td->COMMAND => "runlength -decode concat.encoded a"},
             {$td->STRING => "", $td->EXIT_STATUS => 0});
$td->runtest("check decoded output",
             {$td->FILE => "a"},
             {$td->FILE => "concat"});

cleanup();

$td->report(2 + (4 * scalar(@files)));

sub cleanup
{
    system("rm -f a concat concat.encoded empty");
}

sub concatenate
{
    my ($a, $b, $out) = @_;
    open(F, ">$out");
    foreach my $f ($a, $b)
    {
        local $/ = undef;
        open(G, "<$f");
        print F <G>;
        close(G);
    }
    close(F);
}