SIF Data Structures

Here are the data structures with brief descriptions:

sif_file	A struct for storing necessary data for the processing of an open file
sif_header	A struct for storing a SIF file header in memory
sif_meta_data	A struct for storing meta-data in memory. It stores a node in a linked list of meta-data
sif_tile	A struct for storing a SIF tile header in memory. It stores important information related to a tile, including which of its bands are uniform, and the uniform pixel values of the bands

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