Enum Count 

pub enum Count {
    Tag(u16),
    ToEnd,
    Bytes(u64),
    JpegQuantization,
    JpegHuffman,
}

How long the extents of an ExtentRule are.

Variants

Tag(u16)

Byte counts in this tag, one per offset.

ToEnd

One extent from the first offset to the end of the TIFF.

Bytes(u64)

One extent of this many bytes from the first offset.

JpegQuantization

A 64-byte old-style JPEG quantization table at each nonzero offset. Zero means no separate table; repeated offsets may share a table.

JpegHuffman

An old-style JPEG Huffman table at each nonzero offset: 16 code-count bytes followed by their sum in symbol bytes. Reading the counts uses the walk’s scan budget. Zero means no separate table.