public class Base64InputStream
extends java.io.InputStream
A slight spin on the standard ByteArrayInputStream. This one accepts only a Base64 encoded String in the constructor argument
which decodes into abyte[]
to be read from by
other stream.Modifier and Type | Field and Description |
---|---|
protected byte[] |
buf
An array of bytes that was provided
by the creator of the stream.
|
private static char[] |
CA |
protected int |
count
The index one greater than the last valid character in the input
stream buffer.
|
private static int[] |
IA |
protected int |
mark
The currently marked position in the stream.
|
protected int |
pos
The index of the next character to read from the input stream buffer.
|
Constructor and Description |
---|
Base64InputStream(java.lang.String encodedString)
Creates a
Base64InputStream . |
Modifier and Type | Method and Description |
---|---|
int |
available()
Returns the number of bytes that can be read from this input
stream without blocking.
|
void |
close()
Closing a ByteArrayInputStream has no effect.
|
private byte[] |
decode(java.lang.String source)
Base64 decodes the source string.
|
void |
mark(int readAheadLimit)
Set the current marked position in the stream.
|
boolean |
markSupported()
Tests if this
InputStream supports mark/reset. |
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 into an array of bytes
from this input stream. |
void |
reset()
Resets the buffer to the marked position.
|
long |
skip(long n)
Skips
n bytes of input from this input stream. |
private static final int[] IA
private static final char[] CA
protected byte[] buf
buf[0]
through buf[count-1]
are the
only bytes that can ever be read from the
stream; element buf[pos]
is
the next byte to be read.protected int pos
count
.
The next byte to be read from the input stream buffer
will be buf[pos]
.protected int mark
mark()
method.
The current buffer position is set to this point by the
reset()
method.
If no mark has been set, then the value of mark is the offset
passed to the constructor (or 0 if the offset was not supplied).protected int count
buf
.
It is one greater than the position of
the last byte within buf
that
can ever be read from the input stream buffer.public Base64InputStream(java.lang.String encodedString)
Base64InputStream
.encodedString
- the Base64 encoded Stringpublic int read()
int
in the range
0
to 255
. If no byte is available
because the end of the stream has been reached, the value
-1
is returned.
This read
method
cannot block.read
in class java.io.InputStream
-1
if the end of the
stream has been reached.public int read(byte[] b, int off, int len)
len
bytes of data into an array of bytes
from this input stream.
If pos
equals count
,
then -1
is returned to indicate
end of file. Otherwise, the number k
of bytes read is equal to the smaller of
len
and count-pos
.
If k
is positive, then bytes
buf[pos]
through buf[pos+k-1]
are copied into b[off]
through
b[off+k-1]
in the manner performed
by System.arraycopy
. The
value k
is added into pos
and k
is returned.
This read
method cannot block.read
in class java.io.InputStream
b
- the buffer into which the data is read.off
- the start offset of the data.len
- the maximum number of bytes read.-1
if there is no more data because the end of
the stream has been reached.public long skip(long n)
n
bytes of input from this input stream. Fewer
bytes might be skipped if the end of the input stream is reached.
The actual number k
of bytes to be skipped is equal to the smaller
of n
and count-pos
.
The value k
is added into pos
and k
is returned.skip
in class java.io.InputStream
n
- the number of bytes to be skipped.public int available()
count - pos
,
which is the number of bytes remaining to be read from the input buffer.available
in class java.io.InputStream
public boolean markSupported()
InputStream
supports mark/reset. The
markSupported
method of ByteArrayInputStream
always returns true
.markSupported
in class java.io.InputStream
public void mark(int readAheadLimit)
Note: The readAheadLimit
for this class
has no meaning.
mark
in class java.io.InputStream
public void reset()
reset
in class java.io.InputStream
public void close() throws java.io.IOException
close
in interface java.io.Closeable
close
in interface java.lang.AutoCloseable
close
in class java.io.InputStream
java.io.IOException
private byte[] decode(java.lang.String source)
Base64 decodes the source string. NOTE: This method doesn't consider line breaks
source
- a Base64 encoded stringCopyright © 2002-2013 Oracle America, Inc. All Rights Reserved.