Dumping unmodified raw image data from raw files?

[rt966298]

@ggbutcher

Been thinking about this since @rt966298 (@rt985426?) started the thread; using the product of libraw_unpack() and any of its underlying logic essentially ties any software that does image comparision tests to libraw when there may not be a need.

For the more complex file formats with complex data structures, I have consulted with the libraw maintainers for guidance.

Basically for these files, the difficulty arises because there is currently no meaningful data_offset and data_size because libraw loads and processes the files on the fly, and not into memory.

So in order to leverage libraw’s capabilities to handle these types of files, the xxx_load_raw() functionality of each of the decoders would have to be modified to get the equivalents of data_offset and data_size, or possibly copy the bits to a memory buffer as the file is loaded.

I’m wondering what the best way would be to do this, and possibly provide functionality that the maintainers might want to include like they did for get_internal_data_pointer().

I think getting the equivalents of data_offset and data_size is all that would be needed. I tried modifying your program and set data_size to something static just to see what would happen with complex file formats like Panasonic RW2. It seems to me like this would work with the correct data_offset and data_size.