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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.6.0
java.security
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Field Summary | |
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protected MessageDigest |
digest
The message digest associated with this stream. |
Fields inherited from class java.io.FilterInputStream |
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in |
Constructor Summary | |
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DigestInputStream(InputStream stream,
MessageDigest digest)
Creates a digest input stream, using the specified input stream and message digest. |
Method Summary | |
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MessageDigest |
getMessageDigest()
Returns the message digest associated with this stream. |
void |
on(boolean on)
Turns the digest function on or off. |
int |
read()
Reads a byte, and updates the message digest (if the digest function is on). |
int |
read(byte[] b,
int off,
int len)
Reads into a byte array, and updates the message digest (if the digest function is on). |
void |
setMessageDigest(MessageDigest digest)
Associates the specified message digest with this stream. |
String |
toString()
Prints a string representation of this digest input stream and its associated message digest object. |
Methods inherited from class java.io.FilterInputStream |
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available, close, mark, markSupported, read, reset, skip |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected MessageDigest digest
Constructor Detail |
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public DigestInputStream(InputStream stream, MessageDigest digest)
stream
- the input stream.digest
- the message digest to associate with this stream.Method Detail |
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public MessageDigest getMessageDigest()
setMessageDigest(java.security.MessageDigest)
public void setMessageDigest(MessageDigest digest)
digest
- the message digest to be associated with this stream.getMessageDigest()
public int read() throws IOException
on
), this method
will then call update
on the message digest associated
with this stream, passing it the byte read.
read
in class FilterInputStream
IOException
- if an I/O error occurs.MessageDigest.update(byte)
public int read(byte[] b, int off, int len) throws IOException
len
bytes from the input stream into the array
b
, starting at offset off
. This method
blocks until the data is actually
read. If the digest function is on (see
on
), this method will then call update
on the message digest associated with this stream, passing it
the data.
read
in class FilterInputStream
b
- the array into which the data is read.off
- the starting offset into b
of where the
data should be placed.len
- the maximum number of bytes to be read from the input
stream into b, starting at offset off
.
len
if the end of the stream is reached prior to
reading len
bytes. -1 is returned if no bytes were
read because the end of the stream had already been reached when
the call was made.
IOException
- if an I/O error occurs.MessageDigest.update(byte[], int, int)
public void on(boolean on)
read
methods results in an
update on the message digest. But when it is off, the message
digest is not updated.
on
- true to turn the digest function on, false to turn
it off.public String toString()