Support BigTIFF encoded TIFF data #302
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This will only ever be a 16-bit value.
This allows combining the add and test operations into a single lookup.
Note that while BigTIFF supports files greater than 2 GiB in size, our current implementation does not due to the pervasive use of Int32 throughout the code to represent offsets into the data.
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Note that while BigTIFF supports files greater than 2 GiB in size, our current implementation does not due to the pervasive use of Int32 throughout the code to represent offsets into the data.
This PR involves several API changes. These are public APIs, but are unlikely to be used directly by user code.