#!/bin/bash

COMPRESS=./compress
DECOMPRESS=./decompress

INPUT="$1"

TEST_COMPRESSED=$(mktemp)
TEST_DECOMPRESSED=$(mktemp)

# make sure test files are always deleted
cleanup() {
    rm -f $TEST_COMPRESSED $TEST_DECOMPRESSED
}
trap cleanup 0

$COMPRESS < "$INPUT" > $TEST_COMPRESSED
$DECOMPRESS < $TEST_COMPRESSED > $TEST_DECOMPRESSED

# check decompression
if ! cmp "$INPUT" $TEST_DECOMPRESSED; then
    echo Decompressed data does not match original input
    exit 1
fi

# print size ratio as percentage
# we add 1 to denominator to avoid dividing by zero
echo $((100 * $(stat -c %s $TEST_COMPRESSED) / (1 + $(stat -c %s $TEST_DECOMPRESSED))))