Package io.milton.zsync

Class Generator

java.lang.Object
io.milton.zsync.Generator
public class Generator extends Object
Checksum generation methods.
Version:
$Revision: 1.12 $

  • Constructor Details

    • Generator

      public Generator()

  • Method Details

    • generateSums

      public List generateSums(byte[] buf, long baseOffset, Configuration config)
      Generate checksums over an entire byte array, with a specified base offset. This baseOffset is added to the offset stored in each ChecksumPair.
      Parameters:
      buf - The byte array to checksum.
      baseOffset - The offset from whence this byte array came.
      Returns:
      A List of ChecksumPairs generated from the array.
      See Also:
      • #generateSums(byte[],int,int,long)

    • generateSums

      public List generateSums(File f, Configuration config) throws IOException
      Generate checksums for an entire file.
      Parameters:
      f - The File to checksum.
      Returns:
      A List of ChecksumPairs generated from the file.
      Throws:
      IOException - if f cannot be read from.

    • generateSums

      public List generateSums(InputStream in, Configuration config, MessageDigest sha1) throws IOException, NoSuchAlgorithmException
      Generate checksums for an InputStream.
      Parameters:
      in - The InputStream to checksum.
      Returns:
      A List of ChecksumPairs generated from the bytes read.
      Throws:
      IOException - if reading fails.
      NoSuchAlgorithmException

    • generateSum

      public ChecksumPair generateSum(byte[] buf, long fileOffset, Configuration config)
      Generate a sum pair for an entire byte array.
      Parameters:
      buf - The byte array to checksum.
      fileOffset - The offset in the original file from whence this block came.
      Returns:
      A ChecksumPair for this byte array.

    • generateSum

      public ChecksumPair generateSum(byte[] buf, int off, int len, long fileOffset, Configuration config)
      Generate a sum pair for a portion of a byte array.
      Parameters:
      buf - The byte array to checksum.
      off - Where in buf to start.
      len - How many bytes to checksum.
      fileOffset - The original offset of this byte array.
      Returns:
      A ChecksumPair for this byte array.

    • generateWeakSum

      public int generateWeakSum(byte[] buf, int offset, Configuration config)

    • generateRollSum

      public int generateRollSum(byte b, Configuration config)

    • generateStrongSum

      public byte[] generateStrongSum(byte[] buf, int off, int len, Configuration config)