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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.io.InputStream java.io.FilterInputStream java.util.zip.CheckedInputStream
public class CheckedInputStream
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.
Checksum
Field Summary |
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Fields inherited from class java.io.FilterInputStream |
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in |
Constructor Summary | |
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CheckedInputStream(InputStream in,
Checksum cksum)
Creates an input stream using the specified Checksum. |
Method Summary | |
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Checksum |
getChecksum()
Returns the Checksum for this input stream. |
int |
read()
Reads a byte. |
int |
read(byte[] buf,
int off,
int len)
Reads into an array of bytes. |
long |
skip(long n)
Skips specified number of bytes of input. |
Methods inherited from class java.io.FilterInputStream |
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available, close, mark, markSupported, read, reset |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public CheckedInputStream(InputStream in, Checksum cksum)
in
- the input streamcksum
- the ChecksumMethod Detail |
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public int read() throws IOException
read
in class FilterInputStream
IOException
- if an I/O error has occurredFilterInputStream.in
public int read(byte[] buf, int off, int len) throws IOException
len
is not zero, the method
blocks until some input is available; otherwise, no
bytes are read and 0
is returned.
read
in class FilterInputStream
buf
- the buffer into which the data is readoff
- the start offset in the destination array b
len
- the maximum number of bytes read
NullPointerException
- If buf
is null
.
IndexOutOfBoundsException
- If off
is negative,
len
is negative, or len
is greater than
buf.length - off
IOException
- if an I/O error has occurredFilterInputStream.in
public long skip(long n) throws IOException
skip
in class FilterInputStream
n
- the number of bytes to skip
IOException
- if an I/O error has occurredpublic Checksum getChecksum()
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Java™ Platform Standard Ed. 6 |
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