java.util.zip: public class: CheckedInputStream

java.util.zip
public class: CheckedInputStream [javadoc | source]

java.lang.Object
   java.io.InputStream
      java.io.FilterInputStream
         java.util.zip.CheckedInputStream

All Implemented Interfaces:
Closeable

An input stream that also maintains a checksum of the data being read. The checksum can then be used to verify the integrity of the input data.

Also see:

Checksum

author: David - Connelly

Fields inherited from java.io.FilterInputStream:
in

Constructor:

Constructor:
public CheckedInputStream(InputStream in, Checksum cksum) { super(in); this.cksum = cksum; } Creates an input stream using the specified Checksum. Parameters: `in` - the input stream `cksum` - the Checksum

 public CheckedInputStream(InputStream in,
    Checksum cksum) {
        super(in);
        this.cksum = cksum;
}

Creates an input stream using the specified Checksum.

Parameters:

in - the input stream

cksum - the Checksum

Method from java.util.zip.CheckedInputStream Summary:
getChecksum, read, read, skip

Methods from java.io.FilterInputStream:
available, close, mark, markSupported, read, read, read, reset, skip

Methods from java.io.InputStream:
available, close, mark, markSupported, read, read, read, reset, skip

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from java.util.zip.CheckedInputStream Detail:
public Checksum getChecksum() { return cksum; } Returns the Checksum for this input stream.
public int read() throws IOException { int b = in.read(); if (b != -1) { cksum.update(b); } return b; } Reads a byte. Will block if no input is available.
public int read(byte[] buf, int off, int len) throws IOException { len = in.read(buf, off, len); if (len != -1) { cksum.update(buf, off, len); } return 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.
public long skip(long n) throws IOException { 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; } Skips specified number of bytes of input.

Method from java.util.zip.CheckedInputStream Detail:

 public Checksum getChecksum() {
        return cksum;
}

Returns the Checksum for this input stream.

 public int read() throws IOException {
        int b = in.read();
        if (b != -1) {
            cksum.update(b);
        }
        return b;
}

Reads a byte. Will block if no input is available.

 public int read(byte[] buf,
    int off,
    int len) throws IOException {
        len = in.read(buf, off, len);
        if (len != -1) {
            cksum.update(buf, off, len);
        }
        return len;
}

len

0

 public long skip(long n) throws IOException {
        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;
}

Skips specified number of bytes of input.