public
class
CheckedInputStream
extends FilterInputStream
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.
Summary
Public methods |
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.
|
Inherited methods |
From class
java.io.FilterInputStream
int
|
available()
Returns an estimate of the number of bytes that can be read (or
skipped over) from this input stream without blocking by the next
caller of a method for this input stream.
|
void
|
close()
Closes this input stream and releases any system resources
associated with the stream.
|
void
|
mark(int readlimit)
Marks the current position in this input stream.
|
boolean
|
markSupported()
Tests if this input stream supports the mark
and reset methods.
|
int
|
read()
Reads the next byte of data from this input stream.
|
int
|
read(byte[] b, int off, int len)
Reads up to len bytes of data from this input stream
into an array of bytes.
|
int
|
read(byte[] b)
Reads up to b.length bytes of data from this
input stream into an array of bytes.
|
void
|
reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream.
|
long
|
skip(long n)
Skips over and discards n bytes of data from the
input stream.
|
|
From class
java.io.InputStream
int
|
available()
Returns an estimate of the number of bytes that can be read (or skipped
over) from this input stream without blocking, which may be 0, or 0 when
end of stream is detected.
|
void
|
close()
Closes this input stream and releases any system resources associated
with the stream.
|
void
|
mark(int readlimit)
Marks the current position in this input stream.
|
boolean
|
markSupported()
Tests if this input stream supports the mark and
reset methods.
|
static
InputStream
|
nullInputStream()
Returns a new InputStream that reads no bytes.
|
int
|
read(byte[] b)
Reads some number of bytes from the input stream and stores them into
the buffer array b .
|
abstract
int
|
read()
Reads the next byte of data from the input stream.
|
int
|
read(byte[] b, int off, int len)
Reads up to len bytes of data from the input stream into
an array of bytes.
|
byte[]
|
readAllBytes()
Reads all remaining bytes from the input stream.
|
int
|
readNBytes(byte[] b, int off, int len)
Reads the requested number of bytes from the input stream into the given
byte array.
|
byte[]
|
readNBytes(int len)
Reads up to a specified number of bytes from the input stream.
|
void
|
reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream.
|
long
|
skip(long n)
Skips over and discards n bytes of data from this input
stream.
|
void
|
skipNBytes(long n)
Skips over and discards exactly n bytes of data from this input
stream.
|
long
|
transferTo(OutputStream out)
Reads all bytes from this input stream and writes the bytes to the
given output stream in the order that they are read.
|
|
From class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
|
boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
void
|
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
final
Class<?>
|
getClass()
Returns the runtime class of this Object .
|
int
|
hashCode()
Returns a hash code value for the object.
|
final
void
|
notify()
Wakes up a single thread that is waiting on this object's
monitor.
|
final
void
|
notifyAll()
Wakes up all threads that are waiting on this object's monitor.
|
String
|
toString()
Returns a string representation of the object.
|
final
void
|
wait(long timeoutMillis, int nanos)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait(long timeoutMillis)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait()
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted.
|
|
From interface
java.io.Closeable
abstract
void
|
close()
Closes this stream and releases any system resources associated
with it.
|
|
|
Public constructors
public CheckedInputStream (InputStream in,
Checksum cksum)
Creates an input stream using the specified Checksum.
Parameters |
in |
InputStream : the input stream |
cksum |
Checksum : the Checksum |
Public methods
getChecksum
public Checksum getChecksum ()
Returns the Checksum for this input stream.
read
public int read ()
Reads a byte. Will block if no input is available.
Returns |
int |
the byte read, or -1 if the end of the stream is reached. |
read
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.
Parameters |
buf |
byte : the buffer into which the data is read |
off |
int : the start offset in the destination array b |
len |
int : the maximum number of bytes read |
Returns |
int |
the actual number of bytes read, or -1 if the end
of the stream is reached. |
skip
public long skip (long n)
Skips specified number of bytes of input.
Parameters |
n |
long : the number of bytes to skip |
Returns |
long |
the actual number of bytes skipped |