Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.

  Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream. The next invocation 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.

Note that while some implementations of InputStream will return the total number of bytes in the stream, many will not. It is never correct to use the return value of this method to allocate a buffer intended to hold all data in this stream.

A subclass' implementation of this method may choose to throw an IOException if this input stream has been closed by invoking the InputStream.close() method.

The available method for class InputStream always returns 0.

This method should be overridden by subclasses.
Returns: an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking or {@code 0} when it reaches the end of the input stream.
Throws:
- IOException - if an I/O error occurs.

  Closes this input stream and releases any system resources associated with the stream.

  Closes this input stream and releases any system resources associated with the stream.

The close method of InputStream does nothing.
Throws:
- IOException - if an I/O error occurs.

  Marks the current position in this input stream.

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

The general contract of mark is that, if the method markSupported returns true, the stream somehow remembers all the bytes read after the call to mark and stands ready to supply those same bytes again if and whenever the method reset is called. However, the stream is not required to remember any data at all if more than readlimit bytes are read from the stream before reset is called.

Marking a closed stream should not have any effect on the stream.

The mark method of InputStream does nothing.
Parameters:
- readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.
See Also: InputStream.reset(),

  Tests if this input stream supports the mark and reset methods.

  Tests if this input stream supports the mark and
reset methods. Whether or not mark and
reset are supported is an invariant property of a
particular input stream instance. The markSupported method
of InputStream returns false.
Returns: true if this stream instance supports the mark and reset methods; false otherwise.
See Also: InputStream.mark(int), InputStream.reset(),

  Returns the ORB that created this InputStream.

  Returns the ORB that created this InputStream.
Returns: the ORB object that created this stream
See Also: portable package comments for unimplemented features,

  Reads an Any from this input stream.

  Reads an Any from this input stream.
Returns: the Any instance read from this input stream.

  Reads an array of booleans from this input stream.

  Reads an array of booleans from this input stream.
Parameters:
- value - returned array of booleans.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a boolean value from this input stream.

  Reads a boolean value from this input stream.
Returns: the boolean value read from this input stream

  Reads an array of chars from this input stream.

  Reads an array of chars from this input stream.
Parameters:
- value - returned array of chars.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a char value from this input stream.

  Reads a char value from this input stream.
Returns: the char value read from this input stream

  Reads a CORBA context from the stream.

  Reads a CORBA context from the stream.
Returns: a CORBA context
See Also: portable package comments for unimplemented features,

  Reads an array of doubles from this input stream.

  Reads an array of doubles from this input stream.
Parameters:
- value - returned array of doubles.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a double value from this input stream.

  Reads a double value from this input stream.
Returns: the double value read from this input stream

  Reads a BigDecimal number.

  Reads a BigDecimal number.
Returns: a java.math.BigDecimal number

  Reads an array of floats from this input stream.

  Reads an array of floats from this input stream.
Parameters:
- value - returned array of floats.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a float value from this input stream.

  Reads a float value from this input stream.
Returns: the float value read from this input stream

  Reads an array of CORBA longs (that is, Java ints) from this input stream.

  Reads an array of CORBA longs (that is, Java ints) from this input stream.
Parameters:
- value - returned array of CORBA longs (that is, Java ints).
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a CORBA long (that is, Java int) value from this input stream.

  Reads a CORBA long (that is, Java int) value from this input stream.
Returns: the int value read from this input stream

  Reads an array of CORBA longlongs (that is, Java longs) from this input stream.

  Reads an array of CORBA longlongs (that is, Java longs) from this input
stream.
Parameters:
- value - returned array of CORBA longs (that is, Java longs).
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a CORBA longlong (that is, Java long) value from this input stream.

  Reads a CORBA longlong (that is, Java long) value from this input stream.
Returns: the long value read from this input stream

  Reads a CORBA object from this input stream.

  Reads a CORBA object from this input stream.
Returns: the Object instance read from this input stream.

  Unmarshals an object and returns a CORBA Object, which is an instance of the class passed as its argument.

  Unmarshals an object and returns a CORBA Object,
which is an instance of the class passed as its argument.
This class is the stub class of the expected type.
Returns: an Object instance of clz read from this stream
Parameters:
- clz - The Class object for the stub class which corresponds to the type that is statistically expected, or the Class object for the RMI/IDL interface type that is statistically expected.
See Also: portable package comments for unimplemented features,

  Reads an array of octets (that is, bytes) from this input stream.

  Reads an array of octets (that is, bytes) from this input stream.
Parameters:
- value - returned array of octets (that is, bytes).
- offset - offset on the stream.
- length - length of buffer to read.

  Reads an octet (that is, a byte) value from this input stream.

  Reads an octet (that is, a byte) value from this input stream.
Returns: the byte value read from this input stream

  Returns principal for invocation.

  Returns principal for invocation.
Returns: Principal for invocation.

  Reads an array of shorts from this input stream.

  Reads an array of shorts from this input stream.
Parameters:
- value - returned array of shorts.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a short value from this input stream.

  Reads a short value from this input stream.
Returns: the short value read from this input stream

  Reads a string value from this input stream.

  Reads a string value from this input stream.
Returns: the String value read from this input stream

  Reads a TypeCode from this input stream.

  Reads a TypeCode from this input stream.
Returns: the TypeCode instance read from this input stream.

  Reads an array of unsigned CORBA longs (that is, Java ints) from this input stream.

  Reads an array of unsigned CORBA longs (that is, Java ints) from this input
stream.
Parameters:
- value - returned array of CORBA longs (that is, Java ints).
- offset - offset on the stream.
- length - length of buffer to read.

  Reads an unsigned CORBA long (that is, Java int) value from this input stream.

  Reads an unsigned CORBA long (that is, Java int) value from this input
stream.
Returns: the int value read from this input stream

  Reads an array of unsigned CORBA longlongs (that is, Java longs) from this input stream.

  Reads an array of unsigned CORBA longlongs (that is, Java longs) from this
input stream.
Parameters:
- value - returned array of CORBA longs (that is, Java longs).
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a CORBA unsigned longlong (that is, Java long) value from this input stream.

  Reads a CORBA unsigned longlong (that is, Java long) value from this input
stream.
Returns: the long value read from this input stream

  Reads an array of unsigned shorts from this input stream.

  Reads an array of unsigned shorts from this input stream.
Parameters:
- value - returned array of shorts.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a unsigned short value from this input stream.

  Reads a unsigned short value from this input stream.
Returns: the short value read from this input stream

  Reads an array of wide chars from this input stream.

  Reads an array of wide chars from this input stream.
Parameters:
- value - returned array of wide chars.
- offset - offset on the stream.
- length - length of buffer to read.

  Reads a wide char value from this input stream.

  Reads a wide char value from this input stream.
Returns: the char value read from this input stream

  Reads a wide string value from this input stream.

  Reads a wide string value from this input stream.
Returns: the String value read from this input stream

 

 
See Also: portable package comments for unimplemented features,

  Reads some number of bytes from the input stream and stores them into the buffer array b.

  Reads some number of bytes from the input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown.

If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at the end of the file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is, at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[k-1], leaving elements b[k] through b[b.length-1] unaffected.

The read(b) method for class InputStream has the same effect as:

 read(b, 0, b.length) 

Returns: the total number of bytes read into the buffer, or -1 is there is no more data because the end of the stream has been reached.
Parameters:
- b - the buffer into which the data is read.
Throws:
- IOException - If the first byte cannot be read for any reason other than the end of the file, if the input stream has been closed, or if some other I/O error occurs.
- NullPointerException - if b is null.
See Also: InputStream.read(byte[], int, int),

  Reads up to len bytes of data from the input stream into an array of bytes.

  Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, but a smaller number may be read. The number of bytes actually read is returned as an integer.

This method blocks until input data is available, end of file is detected, or an exception is thrown.

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off] and elements b[off+len] through b[b.length-1] are unaffected.

The read(b, off, len) method for class InputStream simply calls the method read() repeatedly. If the first such call results in an IOException, that exception is returned from the call to the read(b, off, len) method. If any subsequent call to read() results in a IOException, the exception is caught and treated as if it were end of file; the bytes read up to that point are stored into b and the number of bytes read before the exception occurred is returned. The default implementation of this method blocks until the requested amount of input data len has been read, end of file is detected, or an exception is thrown. Subclasses are encouraged to provide a more efficient implementation of this method.
Returns: 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.
Parameters:
- b - the buffer into which the data is read.
- off - the start offset in array b at which the data is written.
- len - the maximum number of bytes to read.
Throws:
- IOException - If the first byte cannot be read for any reason other than end of file, or if the input stream has been closed, or if some other I/O error occurs.
- NullPointerException - If b is null.
- IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
See Also: InputStream.read(),

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

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

The general contract of reset is:

• If the method markSupported returns true, then:
  • If the method mark has not been called since the stream was created, or the number of bytes read from the stream since mark was last called is larger than the argument to mark at that last call, then an IOException might be thrown.
  • If such an IOException is not thrown, then the stream is reset to a state such that all the bytes read since the most recent call to mark (or since the start of the file, if mark has not been called) will be resupplied to subsequent callers of the read method, followed by any bytes that otherwise would have been the next input data as of the time of the call to reset.
• If the method markSupported returns false, then:
  • The call to reset may throw an IOException.
  • If an IOException is not thrown, then the stream is reset to a fixed state that depends on the particular type of the input stream and how it was created. The bytes that will be supplied to subsequent callers of the read method depend on the particular type of the input stream.

The method reset for class InputStream does nothing except throw an IOException.
Throws:
- IOException - if this stream has not been marked or if the mark has been invalidated.
See Also: InputStream.mark(int), IOException,

  Skips over and discards n bytes of data from this input stream.

  Skips over and discards n bytes of data from this input stream. The skip method may, for a variety of reasons, end up skipping over some smaller number of bytes, possibly 0. This may result from any of a number of conditions; reaching end of file before n bytes have been skipped is only one possibility. The actual number of bytes skipped is returned. If n is negative, no bytes are skipped.

The skip method of this class creates a byte array and then repeatedly reads into it until n bytes have been read or the end of the stream has been reached. Subclasses are encouraged to provide a more efficient implementation of this method. For instance, the implementation may depend on the ability to seek.
Returns: the actual number of bytes skipped.
Parameters:
- n - the number of bytes to be skipped.
Throws:
- IOException - if the stream does not support seek, or if some other I/O error occurs.