public abstract class SSLInputStream extends InputStream
Constructor and Description |
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SSLInputStream() |
Modifier and Type | Method and Description |
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abstract int |
available()
Returns an estimated number of bytes that can be read or skipped without blocking for more
input.
|
abstract int |
read()
Reads the following byte value.
|
int |
read(byte[] b,
int off,
int len)
Reads at most
length bytes from this stream and stores them in
the byte array b starting at offset . |
byte[] |
read(int length)
Returns the vector of opaque values of specified length;
|
int |
readUint16()
Reads and returns uint16 value.
|
int |
readUint24()
Reads and returns uint24 value.
|
long |
readUint32()
Reads and returns uint32 value.
|
long |
readUint64()
Reads and returns uint64 value.
|
int |
readUint8()
Reads and returns uint8 value.
|
close, mark, markSupported, read, reset, skip
public abstract int available() throws IOException
InputStream
Note that this method provides such a weak guarantee that it is not very useful in practice.
Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.
Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".
Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.
It is particularly important to realize that you must not use this method to
size a container and assume that you can read the entirety of the stream without needing
to resize the container. Such callers should probably write everything they read to a
ByteArrayOutputStream
and convert that to a byte array. Alternatively, if you're
reading from a file, File.length()
returns the current length of the file (though
assuming the file's length can't change may be incorrect, reading a file is inherently
racy).
The default implementation of this method in InputStream
always returns 0.
Subclasses should override this method if they are able to indicate the number of bytes
available.
available
in class InputStream
IOException
- if this stream is closed or an error occurspublic abstract int read() throws IOException
read
in class InputStream
IOException
- if the stream is closed or another IOException occurs.SSLStreamedInput.read()
,
SSLBufferedInput.read()
,
HandshakeIODataStream.read()
public int readUint8() throws IOException
IOException
public int readUint16() throws IOException
IOException
public int readUint24() throws IOException
IOException
public long readUint32() throws IOException
IOException
public long readUint64() throws IOException
IOException
public byte[] read(int length) throws IOException
length
- - the length of the vector to be read.IOException
- if read operation could not be finished.public int read(byte[] b, int off, int len) throws IOException
InputStream
length
bytes from this stream and stores them in
the byte array b
starting at offset
.read
in class InputStream
b
- the byte array in which to store the bytes read.off
- the initial position in buffer
to store the bytes read
from this stream.len
- the maximum number of bytes to store in b
.IOException
- if the stream is closed or another IOException occurs.