#!/bin/bash

set -euo pipefail

if [[ $# -ne 1 ]]; then
   echo "$0 {crc32}"
   exit 1
fi
TOOL=$1
TEST_DIR=$(mktemp -d)

# Delete temporary directory and exit with nonzero status.
function die
{
   echo "$1"
   rm -rf "$TEST_DIR"
   exit 1
}

# Run tool against input file and verify that we got the expected CRC.
function run_test
{
   output=$("$TOOL" "$TEST_DIR/input.bin")
   if [[ "$output" != "$2" ]]; then
      die "$1 (file)"
   fi

   output=$("$TOOL" < "$TEST_DIR/input.bin")
   if [[ "$output" != "$2" ]]; then
      die "$1 (stdin)"
   fi
}


cp /dev/null "$TEST_DIR/input.bin"
run_test "$LINENO: empty" "00000000"

echo "58a8a1b9" > "$TEST_DIR/input.bin"
run_test "$LINENO: quine1" "58a8a1b9"

echo "86319a79" > "$TEST_DIR/input.bin"
run_test "$LINENO: quine2" "86319a79"

perl -e 'print "long text" x 456' > "$TEST_DIR/input.bin"
run_test "$LINENO: text" "c45d6d14"

perl -e 'for($i=0;$i<256;$i++){print chr($i);}' > "$TEST_DIR/input.bin"
run_test "$LINENO: binary" "29058c73"

rm -rf "$TEST_DIR"
exit 0