Package org.apache.fontbox.ttf

Class RandomAccessReadDataStream

java.lang.Object

org.apache.fontbox.ttf.TTFDataStream

org.apache.fontbox.ttf.RandomAccessReadDataStream

All Implemented Interfaces:

Closeable, AutoCloseable

class RandomAccessReadDataStream
extends TTFDataStream

An implementation of the TTFDataStream using RandomAccessRead as source. The underlying RandomAccessRead can be any length, but this implementation supports only bufferLengths upto Integer.MAX_VALUE.

Field Summary

Fields

Modifier and Type	Field	Description
private int	currentPosition
private final byte[]	data
private final long	length
private static final org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor	Description
RandomAccessReadDataStream(InputStream inputStream)	Constructor.
RandomAccessReadDataStream(RandomAccessRead randomAccessRead)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the underlying resources.
RandomAccessRead	createSubView(long length)	Creates a view from current position to pos + length.
long	getCurrentPosition()	Get the current position in the stream.
InputStream	getOriginalData()	This will get the original data file that was used for this stream.
long	getOriginalDataSize()	This will get the original data size that was used for this stream.
int	read()	Read an unsigned byte.
int	read(byte[] b, int off, int len)
private int	readInt()	Read a signed 32-bit integer.
final long	readLong()	Read a signed 64-bit integer.
void	seek(long pos)	Seek into the datasource.

Methods inherited from class org.apache.fontbox.ttf.TTFDataStream

read, read32Fixed, readInternationalDate, readSignedByte, readSignedShort, readString, readString, readTag, readUnsignedByte, readUnsignedByteArray, readUnsignedInt, readUnsignedShort, readUnsignedShortArray

Methods inherited from class java.lang.Object

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

Field Details

LOG

private static final org.apache.commons.logging.Log LOG

length

private final long length

data

private final byte[] data

currentPosition

private int currentPosition

Constructor Details

RandomAccessReadDataStream

RandomAccessReadDataStream(RandomAccessRead randomAccessRead)
                    throws IOException

Constructor.

Parameters:

randomAccessRead - source to be read from. Caller should close it.

Throws:

IOException - If there is a problem reading the source data.

RandomAccessReadDataStream

RandomAccessReadDataStream(InputStream inputStream)
                    throws IOException

Constructor.

Parameters:

inputStream - source to be read from. Caller should close it.

Throws:

IOException - If there is a problem reading the source data.

Method Details

getCurrentPosition

public long getCurrentPosition()
                        throws IOException

Get the current position in the stream.

Specified by:

getCurrentPosition in class TTFDataStream

Returns:

The current position in the stream.

Throws:

IOException - If an error occurs while reading the stream.

close

public void close()
           throws IOException

Close the underlying resources.

Throws:

IOException - If there is an error closing the resources.

read

public int read()
         throws IOException

Read an unsigned byte.

Specified by:

read in class TTFDataStream

Returns:

An unsigned byte, or -1, signalling 'no more data'

Throws:

IOException - If there is an error reading the data.

readLong

public final long readLong()
                    throws IOException

Read a signed 64-bit integer.

Specified by:

readLong in class TTFDataStream

Returns:

eight bytes interpreted as a long.

Throws:

IOException - If there is an error reading the data.

readInt

private int readInt()
             throws IOException

Read a signed 32-bit integer.

Returns:

4 bytes interpreted as an int.

Throws:

IOException - If there is an error reading the data.

seek

public void seek(long pos)
          throws IOException

Seek into the datasource. When the requested pos is < 0, an IOException() is fired. When the requested pos is ≥ length, the currentPosition is set to the first byte after the data!

Specified by:

seek in class TTFDataStream

Parameters:

pos - The position to seek to.

Throws:

IOException - If there is an error seeking to that position.

read

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

Specified by:

read in class TTFDataStream

Parameters:

b - The buffer to write to.

off - The offset into the buffer.

len - The length into the buffer.

Returns:

The number of bytes read or -1, signalling 'no more data'

Throws:

IOException - If there is an error reading from the stream.

See Also:

• InputStream.read(byte[], int, int)

createSubView

public RandomAccessRead createSubView(long length)

Description copied from class: TTFDataStream

Creates a view from current position to pos + length. It can be faster than read(length) if you only need a few bytes. SubView.close() should never close TTFDataStream.this, only itself.

Overrides:

createSubView in class TTFDataStream

Returns:

A view or null (caller can use TTFDataStream.read() instead). Please close() the result

getOriginalData

public InputStream getOriginalData()
                            throws IOException

This will get the original data file that was used for this stream.

Specified by:

getOriginalData in class TTFDataStream

Returns:

The data that was read from.

Throws:

IOException - If there is an issue reading the data.

getOriginalDataSize

public long getOriginalDataSize()

This will get the original data size that was used for this stream.

Specified by:

getOriginalDataSize in class TTFDataStream

Returns:

The size of the original data.