Package org.apache.fontbox.cff

Class DataInputRandomAccessRead

java.lang.Object
org.apache.fontbox.cff.DataInputRandomAccessRead
All Implemented Interfaces:
DataInput
public class DataInputRandomAccessRead extends 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 Details

  • Constructor Details

    • DataInputRandomAccessRead

      public DataInputRandomAccessRead(RandomAccessRead randomAccessRead)
      Constructor.
      Parameters:
      randomAccessRead - the source to be read from

  • Method Details

    • hasRemaining

      public boolean hasRemaining() throws 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:
      IOException - when the underlying buffer has already been closed.

    • getPosition

      public int getPosition() throws IOException
      Returns the current position.
      Specified by:
      getPosition in interface DataInput
      Returns:
      current position.
      Throws:
      IOException - when the underlying buffer has already been closed.

    • setPosition

      public void setPosition(int position) throws 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:
      IOException - if the new position is out of rangeor when the underlying buffer has already been closed.

    • readByte

      public byte readByte() throws IOException
      Read one single byte from the buffer.
      Specified by:
      readByte in interface DataInput
      Returns:
      the byte.
      Throws:
      IOException - when there are no bytes to read or when the underlying buffer has already been closed.

    • readUnsignedByte

      public int readUnsignedByte() throws IOException
      Read one single unsigned byte from the buffer.
      Specified by:
      readUnsignedByte in interface DataInput
      Returns:
      the unsigned byte as int.
      Throws:
      IOException - when there are no bytes to read or when the underlying buffer has already been closed.

    • peekUnsignedByte

      public int peekUnsignedByte(int offset) throws 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:
      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 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:
      IOException - when there are less than length bytes available or when the underlying buffer has already been closed.

    • length

      public int length() throws IOException
      Specified by:
      length in interface DataInput
      Throws:
      IOException