Package edu.harvard.hul.ois.jhove

Class CountedInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

edu.harvard.hul.ois.jhove.CountedInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class CountedInputStream
extends FilterInputStream

A FilterInputStream which passes only a specified number of bytes, then returns an EOF condition.

Author:

Gary McGath

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
CountedInputStream(InputStream instrm, int count)

Method Summary

Modifier and Type	Method	Description
int	read()	Reads a single byte from the stream and decrements the count of remaining bytes.
int	read(byte[] b)	Reads some number of bytes from the input stream and stores them into the buffer array b.
int	read(byte[] b, int off, int len)	Reads up to len bytes of data from the input stream into an array of bytes.
long	skip(long n)	Skips n bytes.

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, reset

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CountedInputStream

public CountedInputStream(InputStream instrm,
 int count)

Parameters:

instrm - The InputStream being counted

count - The number of bytes to be allowed

Method Details

read

public int read()
         throws IOException

Reads a single byte from the stream and decrements the count of remaining bytes. If the count is exhausted, returns -1 to signify end of file.

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Reads some number of bytes from the input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. The number of bytes read will not exceed the number of bytes remaining in the count. The count is decremented by the number of bytes actually read.

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(byte[] b,
 int off,
 int len)
         throws IOException

Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer. The number of bytes read will not exceed the number of bytes remaining in the count. The count is decremented by the number of bytes actually read.

Overrides:

read in class FilterInputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Skips n bytes. Decrements the count by the number of bytes actually skipped.

Overrides:

skip in class FilterInputStream

Throws:

IOException