/** Convert a Json map to a MD5MD5CRC32FileChecksum. */
public static MD5MD5CRC32FileChecksum toMD5MD5CRC32FileChecksum(final Map<?, ?> json)
throws IOException {
if (json == null) {
return null;
}
final Map<?, ?> m = (Map<?, ?>) json.get(MD5MD5CRC32FileChecksum.class.getSimpleName());
final String algorithm = (String) m.get("algorithm");
final int length = (int) (long) (Long) m.get("length");
final byte[] bytes = StringUtils.hexStringToByte((String) m.get("bytes"));
final DataInputStream in = new DataInputStream(new ByteArrayInputStream(bytes));
final int bytesPerCRC = in.readInt();
final long crcPerBlock = in.readLong();
final MD5Hash md5 = MD5Hash.read(in);
final MD5MD5CRC32FileChecksum checksum =
new MD5MD5CRC32FileChecksum(bytesPerCRC, crcPerBlock, md5);
// check algorithm name
final String alg = "MD5-of-" + crcPerBlock + "MD5-of-" + bytesPerCRC + "CRC32";
if (!alg.equals(algorithm)) {
throw new IOException(
"Algorithm not matched: algorithm="
+ algorithm
+ ", crcPerBlock="
+ crcPerBlock
+ ", bytesPerCRC="
+ bytesPerCRC);
}
// check length
if (length != checksum.getLength()) {
throw new IOException(
"Length not matched: length="
+ length
+ ", checksum.getLength()="
+ checksum.getLength());
}
return checksum;
}
