com.tencent.cos.xml.crypto

类 InputSubstream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.tencent.cos.xml.crypto.SdkFilterInputStream

com.tencent.cos.xml.crypto.InputSubstream

所有已实现的接口:

Releasable, java.io.Closeable, java.lang.AutoCloseable

public final class InputSubstream
extends SdkFilterInputStream

Filtered input stream implementation that exposes a range of an input stream as a new input stream.

字段概要

从类继承的字段 java.io.FilterInputStream

in

构造器概要

构造器

构造器和说明
InputSubstream(java.io.InputStream in, long offset, long length, boolean closeSourceStream) Constructs a new InputSubstream so that when callers start reading from this stream they'll start at the specified offset in the real stream and after they've read the specified length, this stream will look empty.

方法概要

限定符和类型	方法和说明
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.
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.
void	reset() Repositions this stream to the position at the time the mark method was last called on this input stream.

从类继承的方法 com.tencent.cos.xml.crypto.SdkFilterInputStream

abort, abortIfNeeded, isAborted, markSupported, release, skip

从类继承的方法 java.io.FilterInputStream

read

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

InputSubstream

public InputSubstream(java.io.InputStream in,
                      long offset,
                      long length,
                      boolean closeSourceStream)

Constructs a new InputSubstream so that when callers start reading from this stream they'll start at the specified offset in the real stream and after they've read the specified length, this stream will look empty.

参数:

in - The input stream to wrap.

offset - The offset, in bytes, into the specified input stream at which to start reading data.

length - The length, in bytes, of the specified input stream to return through this stream.

closeSourceStream - True if the wrapped InputStream should be closed when this InputSubstream is closed.

方法详细资料

read

public int read()
         throws java.io.IOException

从类复制的说明: java.io.FilterInputStream

Reads the next byte of data from this input stream. The value byte is returned as an 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 method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

This method simply performs in.read() and returns the result.

覆盖:

read 在类中 SdkFilterInputStream

返回:

the next byte of data, or -1 if the end of the stream is reached.

抛出:

java.io.IOException - if an I/O error occurs.

另请参阅:

FilterInputStream.in

read

public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException

从类复制的说明: java.io.FilterInputStream

Reads up to len bytes of data from this input stream 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.

This method simply performs in.read(b, off, len) and returns the result.

覆盖:

read 在类中 SdkFilterInputStream

参数:

b - the buffer into which the data is read.

off - the start offset in the destination array b

len - the maximum number of bytes read.

返回:

the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

抛出:

java.io.IOException - if an I/O error occurs.

另请参阅:

FilterInputStream.in

mark

public void mark(int readlimit)

从类复制的说明: java.io.FilterInputStream

Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated.

This method simply performs in.mark(readlimit).

覆盖:

mark 在类中 SdkFilterInputStream

参数:

readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.

另请参阅:

FilterInputStream.in, FilterInputStream.reset()

reset

public void reset()
           throws java.io.IOException

从类复制的说明: java.io.FilterInputStream

Repositions this stream to the position at the time the mark method was last called on this input stream.

This method simply performs in.reset().

Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parse, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If this happens within readlimit bytes, it allows the outer code to reset the stream and try another parser.

覆盖:

reset 在类中 SdkFilterInputStream

抛出:

java.io.IOException - if the stream has not been marked or if the mark has been invalidated.

另请参阅:

FilterInputStream.in, FilterInputStream.mark(int)

close

public void close()
           throws java.io.IOException

从类复制的说明: java.io.FilterInputStream

Closes this input stream and releases any system resources associated with the stream. This method simply performs in.close().

指定者:

close 在接口中 java.io.Closeable

指定者:

close 在接口中 java.lang.AutoCloseable

覆盖:

close 在类中 SdkFilterInputStream

抛出:

java.io.IOException - if an I/O error occurs.

另请参阅:

FilterInputStream.in

available

public int available()
              throws java.io.IOException

从类复制的说明: java.io.FilterInputStream

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. The next caller might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

This method returns the result of in.available().

覆盖:

available 在类中 SdkFilterInputStream

返回:

an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking.

抛出:

java.io.IOException - if an I/O error occurs.