edu.harvard.hul.ois.jhove.module.iff

Class Chunk

java.lang.Object

edu.harvard.hul.ois.jhove.module.iff.Chunk

Direct Known Subclasses:

ApplicationChunk, AudioRecChunk, AXMLChunk, BroadcastExtChunk, CartChunk, CommentsChunk, CommonChunk, CueChunk, DataChunk, ExifMakerNoteChunk, ExifStringChunk, ExifUserCommentChunk, ExifVersionChunk, FactChunk, FormatChunk, FormatVersionChunk, InstrumentChunk, InstrumentChunk, LabeledTextChunk, LinkChunk, ListInfoTextChunk, MarkerChunk, MidiChunk, MpegChunk, PeakEnvelopeChunk, SampleChunk, SaxelChunk, SimpleTextChunk, SoundDataChunk, Superchunk, TextChunk

public abstract class Chunk
extends Object

Abstract superclass for IFF/AIFF chunks.

Author:

Gary McGath

Field Summary

Fields

Modifier and Type	Field and Description
protected DataInputStream	_dstream
protected ModuleBase	_module
protected long	bytesLeft

Constructor Summary

Constructors

Constructor and Description
Chunk(ModuleBase module, ChunkHeader hdr, DataInputStream dstrm) Constructor.

Method Summary

Modifier and Type	Method and Description
protected String	byteBufString(byte[] b) Convert a byte buffer cleanly to an ASCII string.
abstract boolean	readChunk(RepInfo info) Reads a chunk and puts appropriate information into the RepInfo object.

Methods inherited from class java.lang.Object

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

Field Detail

_module

protected ModuleBase _module

bytesLeft

protected long bytesLeft

_dstream

protected DataInputStream _dstream

Constructor Detail

Chunk

public Chunk(ModuleBase module,
             ChunkHeader hdr,
             DataInputStream dstrm)

Constructor.

Parameters:

module - The Module under which this was called

hdr - The header for this chunk

dstrm - The stream from which the data are being read

Method Detail

readChunk

public abstract boolean readChunk(RepInfo info)
                           throws IOException,
                                  JhoveException

Reads a chunk and puts appropriate information into the RepInfo object.

Parameters:

info - RepInfo object to receive information

Returns:

false if the chunk is structurally invalid, otherwise true

Throws:

JhoveException

IOException

byteBufString

protected String byteBufString(byte[] b)

Convert a byte buffer cleanly to an ASCII string. This is used for fixed-allocation strings in Broadcast WAVE chunks, and might have uses elsewhere. If a string is shorter than its fixed allocation, we're guaranteed only that there is a null terminating the string, and noise could follow it. So we can't use the byte buffer constructor for a string.