File	Doc	Category	Size	Date	Package
CheckedInputStream.java	API Doc	Java SE 6 API	2881	Tue Jun 10 00:26:00 BST 2008	java.util.zip

CheckedInputStream

• java.lang.Object
  • java.io.InputStream
    • java.io.FilterInputStream

Fields Summary
private Checksum	cksum

Constructors Summary
public CheckedInputStream(InputStream in, Checksum cksum) Creates an input stream using the specified Checksum. param in the input stream param cksum the Checksum super(in); this.cksum = cksum;

Methods Summary
public java.util.zip.Checksum	getChecksum() Returns the Checksum for this input stream. return the Checksum value return cksum;
public int	read() Reads a byte. Will block if no input is available. return the byte read, or -1 if the end of the stream is reached. exception IOException if an I/O error has occurred int b = in.read(); if (b != -1) { cksum.update(b); } return b;
public int	read(byte[] buf, int off, int len) Reads into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned. param buf the buffer into which the data is read param off the start offset in the destination array b param len the maximum number of bytes read return the actual number of bytes read, or -1 if the end of the stream is reached. exception NullPointerException If buf is null. exception IndexOutOfBoundsException If off is negative, len is negative, or len is greater than buf.length - off exception IOException if an I/O error has occurred len = in.read(buf, off, len); if (len != -1) { cksum.update(buf, off, len); } return len;
public long	skip(long n) Skips specified number of bytes of input. param n the number of bytes to skip return the actual number of bytes skipped exception IOException if an I/O error has occurred byte[] buf = new byte[512]; long total = 0; while (total < n) { long len = n - total; len = read(buf, 0, len < buf.length ? (int)len : buf.length); if (len == -1) { return total; } total += len; } return total;