Constructor Detail

• TiffReader

  public TiffReader()

Method Detail

• processTiff

  public void processTiff​(MetadataExtractor.RandomAccessReader reader,
                          MetadataExtractor.TiffHandler handler,
                          int tiffHeaderOffset)
                   throws MetadataExtractor.TiffProcessingException,
                          java.io.IOException

  Processes a TIFF data sequence.

  Parameters:

  reader - the MetadataExtractor.RandomAccessReader from which the data should be read

  handler - the MetadataExtractor.TiffHandler that will coordinate processing and accept read values

  tiffHeaderOffset - the offset within reader at which the TIFF header starts

  Throws:

  MetadataExtractor.TiffProcessingException - if an error occurred during the processing of TIFF data that could not be ignored or recovered from

  java.io.IOException - an error occurred while accessing the required data

• processIfd

  public void processIfd​(MetadataExtractor.TiffHandler handler,
                         MetadataExtractor.RandomAccessReader reader,
                         java.util.Set<java.lang.Integer> processedIfdOffsets,
                         int ifdOffset,
                         int tiffHeaderOffset)
                  throws java.io.IOException

  Processes a TIFF IFD. IFD Header:

  • 2 bytes number of tags

  Tag structure:

  • 2 bytes tag type
  • 2 bytes format code (values 1 to 12, inclusive)
  • 4 bytes component count
  • 4 bytes inline value, or offset pointer if too large to fit in four bytes

  Parameters:

  handler - the com.drew.imaging.tiff.TiffHandler that will coordinate processing and accept read values

  reader - the com.drew.lang.RandomAccessReader from which the data should be read

  processedIfdOffsets - the set of visited IFD offsets, to avoid revisiting the same IFD in an endless loop

  ifdOffset - the offset within reader at which the IFD data starts

  tiffHeaderOffset - the offset within reader at which the TIFF header starts

  Throws:

  java.io.IOException - an error occurred while accessing the required data

• processTag

  private void processTag​(MetadataExtractor.TiffHandler handler,
                          int tagId,
                          int tagValueOffset,
                          int componentCount,
                          int formatCode,
                          MetadataExtractor.RandomAccessReader reader)
                   throws java.io.IOException

  Throws:

  java.io.IOException

• calculateTagOffset

  private int calculateTagOffset​(int ifdStartOffset,
                                 int entryNumber)

  Determine the offset of a given tag within the specified IFD.

  Parameters:

  ifdStartOffset - the offset at which the IFD starts

  entryNumber - the zero-based entry number