=> R0 = 46 (Return image used space map)
R1 = pointer to name of image (null terminated)
R2 = pointer to buffer
R5 = buffer size
This SWI writes the image used space map to the buffer, 1 bits signifying used blocks, 0 bits free blocks. Bit 0 in a byte comes before bit 7. This SWI sets bits up to min( buffer size, file size ÷ block size ). Block size for a file can be read with OS_File 24. For a non-image file the buffer will be filled with ones.
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