public static FileDesc loadFile(Path root, Path file, int blocSize)
throws NoSuchAlgorithmException, FileNotFoundException, IOException {
MessageDigest md = MessageDigest.getInstance("SHA-512");
MessageDigest fileMd = MessageDigest.getInstance("SHA-512");
FileDesc desc = new FileDesc(file.toString(), null, null);
List<Bloc> list = new ArrayList<Bloc>();
try (FileInputStream fis = new FileInputStream(root.resolve(file).toString())) {
byte[] buf = new byte[blocSize];
byte[] h;
int s;
while ((s = fis.read(buf)) != -1) {
int c;
while (s < buf.length && (c = fis.read()) != -1) buf[s++] = (byte) c;
fileMd.update(buf, 0, s);
// padding
byte p = 0;
while (s < buf.length) buf[s++] = ++p;
h = md.digest(buf);
Bloc bloc = new Bloc(RollingChecksum.compute(buf), new Hash(h));
list.add(bloc);
}
h = fileMd.digest();
desc.fileHash = new Hash(h);
desc.blocs = list.toArray(new Bloc[0]);
}
return desc;
}
/**
* open a file for reading
*
* @param hdfsPath !null path - probably of an existing file
* @return !null stream
*/
@Override
public InputStream openFileForRead(Path src) {
if (isRunningAsUser()) {
return super.openFileForRead(src);
}
String hdfsPath = src.toString();
if (isFileNameLocal(hdfsPath)) {
try {
return new FileInputStream(hdfsPath); // better be local
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
}
}
if (true) throw new UnsupportedOperationException("Fix This"); // ToDo
final FileSystem fs = getDFS();
try {
return fs.open(src);
} catch (IOException e) {
throw new RuntimeException(e);
}
}