Package gov.nih.mipav.model.file

Class MetadataExtractor.PngMetadataReader

java.lang.Object

gov.nih.mipav.model.file.MetadataExtractor.PngMetadataReader

Enclosing class:

MetadataExtractor

public class MetadataExtractor.PngMetadataReader
extends Object

Author:

Drew Noakes https://drewnoakes.com

Field Summary

Fields

Modifier and Type	Field	Description
private Set<MetadataExtractor.PngChunkType>	_desiredChunkTypes
private Charset	_latin1Encoding
(package private) MetadataExtractor.Charsets	ch	The PNG spec states that ISO_8859_1 (Latin-1) encoding should be used for: "tEXt" and "zTXt" chunks, both for keys and values (https://www.w3.org/TR/PNG/#11tEXt) "iCCP" chunks, for the profile name (https://www.w3.org/TR/PNG/#11iCCP) "sPLT" chunks, for the palette name (https://www.w3.org/TR/PNG/#11sPLT) Note that "iTXt" chunks use UTF-8 encoding (https://www.w3.org/TR/PNG/#11iTXt).

Constructor Summary

Constructors

Constructor	Description
PngMetadataReader()

Method Summary

Modifier and Type	Method	Description
private void	processChunk(MetadataExtractor.Metadata metadata, MetadataExtractor.PngChunk chunk)
MetadataExtractor.Metadata	readMetadata(File file)
MetadataExtractor.Metadata	readMetadata(InputStream inputStream)

Methods inherited from class java.lang.Object

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

Field Details

_desiredChunkTypes

private Set<MetadataExtractor.PngChunkType> _desiredChunkTypes

ch

MetadataExtractor.Charsets ch

The PNG spec states that ISO_8859_1 (Latin-1) encoding should be used for:

• "tEXt" and "zTXt" chunks, both for keys and values (https://www.w3.org/TR/PNG/#11tEXt)
• "iCCP" chunks, for the profile name (https://www.w3.org/TR/PNG/#11iCCP)
• "sPLT" chunks, for the palette name (https://www.w3.org/TR/PNG/#11sPLT)

Note that "iTXt" chunks use UTF-8 encoding (https://www.w3.org/TR/PNG/#11iTXt).

For more guidance: http://www.w3.org/TR/PNG-Decoders.html#D.Text-chunk-processing

_latin1Encoding

private Charset _latin1Encoding

Constructor Details

PngMetadataReader

public PngMetadataReader()

Method Details

readMetadata

public MetadataExtractor.Metadata readMetadata(File file)
                                        throws MetadataExtractor.PngProcessingException,
IOException

Throws:

MetadataExtractor.PngProcessingException

IOException

readMetadata

public MetadataExtractor.Metadata readMetadata(InputStream inputStream)
                                        throws MetadataExtractor.PngProcessingException,
IOException

Throws:

MetadataExtractor.PngProcessingException

IOException

processChunk

private void processChunk(MetadataExtractor.Metadata metadata,
 MetadataExtractor.PngChunk chunk)
                   throws MetadataExtractor.PngProcessingException,
IOException

Throws:

MetadataExtractor.PngProcessingException

IOException