nf-core_modules/deprecated/lib/checksum.groovy
2020-12-14 00:23:28 +00:00

34 lines
1 KiB
Groovy

import java.security.MessageDigest
private static String getMD5(File file) throws IOException
{
// https://howtodoinjava.com/java/io/how-to-generate-sha-or-md5-file-checksum-hash-in-java/
//Get file input stream for reading the file content
FileInputStream fis = new FileInputStream(file);
//Create byte array to read data in chunks
byte[] byteArray = new byte[1024];
int bytesCount = 0;
//Read file data and update in message digest
def digest = MessageDigest.getInstance("MD5")
while ((bytesCount = fis.read(byteArray)) != -1) {
digest.update(byteArray, 0, bytesCount);
};
//close the stream; We don't need it now.
fis.close();
//Get the hash's bytes
byte[] bytes = digest.digest();
//This bytes[] has bytes in decimal format;
//Convert it to hexadecimal format
StringBuilder sb = new StringBuilder();
for(int i=0; i< bytes.length ;i++)
{
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
}
//return complete hash
return sb.toString();
}