Package org.apache.fontbox.cff

Class DataInputRandomAccessRead

java.lang.Object

org.apache.fontbox.cff.DataInputRandomAccessRead

All Implemented Interfaces:

DataInput

public class DataInputRandomAccessRead
extends java.lang.Object
implements DataInput

This class implements the DataInput interface using a RandomAccessRead as source.
Note: things can get hairy when the underlying buffer is larger than Integer.MAX_VALUE. Straight forward reading may work, but getPosition() and setPosition(int) may have problems.

Field Summary

Fields

Modifier and Type	Field	Description
private RandomAccessRead	randomAccessRead

Constructor Summary

Constructors

Constructor	Description
DataInputRandomAccessRead(RandomAccessRead randomAccessRead)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	getPosition()	Returns the current position.
boolean	hasRemaining()	Determines if there are any bytes left to read or not.
int	length()
int	peekUnsignedByte(int offset)	Peeks one single unsigned byte from the buffer.
byte	readByte()	Read one single byte from the buffer.
byte[]	readBytes(int length)	Read a number of single byte values from the buffer. Note: when readBytes(5) is called, but there are only 3 bytes available, the caller gets an IOException, not the 3 bytes!
int	readUnsignedByte()	Read one single unsigned byte from the buffer.
void	setPosition(int position)	Sets the current absolute position to the given value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.fontbox.cff.DataInput

readInt, readOffset, readShort, readUnsignedShort

Field Detail

randomAccessRead

private final RandomAccessRead randomAccessRead

Constructor Detail

DataInputRandomAccessRead

public DataInputRandomAccessRead(RandomAccessRead randomAccessRead)

Constructor.

Parameters:

randomAccessRead - the source to be read from

Method Detail

hasRemaining

public boolean hasRemaining()
                     throws java.io.IOException

Determines if there are any bytes left to read or not.

Specified by:

hasRemaining in interface DataInput

Returns:

true if there are any bytes left to read.

Throws:

java.io.IOException - when the underlying buffer has already been closed.

getPosition

public int getPosition()
                throws java.io.IOException

Returns the current position.

Specified by:

getPosition in interface DataInput

Returns:

current position.

Throws:

java.io.IOException - when the underlying buffer has already been closed.

setPosition

public void setPosition(int position)
                 throws java.io.IOException

Sets the current absolute position to the given value. You cannot use setPosition(-20) to move 20 bytes back!

Specified by:

setPosition in interface DataInput

Parameters:

position - the given position, must be 0 ≤ position < length.

Throws:

java.io.IOException - if the new position is out of rangeor when the underlying buffer has already been closed.

readByte

public byte readByte()
              throws java.io.IOException

Read one single byte from the buffer.

Specified by:

readByte in interface DataInput

Returns:

the byte.

Throws:

java.io.IOException - when there are no bytes to read or when the underlying buffer has already been closed.

readUnsignedByte

public int readUnsignedByte()
                     throws java.io.IOException

Read one single unsigned byte from the buffer.

Specified by:

readUnsignedByte in interface DataInput

Returns:

the unsigned byte as int.

Throws:

java.io.IOException - when there are no bytes to read or when the underlying buffer has already been closed.

peekUnsignedByte

public int peekUnsignedByte(int offset)
                     throws java.io.IOException

Peeks one single unsigned byte from the buffer.

Specified by:

peekUnsignedByte in interface DataInput

Parameters:

offset - offset to the byte to be peeked, must be 0 ≤ offset.

Returns:

the unsigned byte as int.

Throws:

java.io.IOException - when the offset is negative or beyond end_of_buffer or when the underlying buffer has been closed already.

readBytes

public byte[] readBytes(int length)
                 throws java.io.IOException

Read a number of single byte values from the buffer.
Note: when readBytes(5) is called, but there are only 3 bytes available, the caller gets an IOException, not the 3 bytes!

Specified by:

readBytes in interface DataInput

Parameters:

length - the number of bytes to be read, must be 0 ≤ length.

Returns:

an array with containing the bytes from the buffer.

Throws:

java.io.IOException - when there are less than length bytes available or when the underlying buffer has already been closed.

length

public int length()
           throws java.io.IOException

Specified by:

length in interface DataInput

Throws:

java.io.IOException