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OBD:Instance file format: Difference between revisions
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Next we are told the addresses and sizes of the '''data and name tables''' in the instance file. The name table simply follows the data table, as you'll see if you add the data table offset plus the data table size, but that doesn't mean the name table offset is redundant; if its start was not 32-bit-aligned, it probably would be moved down to start at the next 32-bit word, but this is unnecessary because it happens to be aligned already. | Next we are told the addresses and sizes of the '''data and name tables''' in the instance file. The name table simply follows the data table, as you'll see if you add the data table offset plus the data table size, but that doesn't mean the name table offset is redundant; if its start was not 32-bit-aligned, it probably would be moved down to start at the next 32-bit word, but this is unnecessary because it happens to be aligned already. | ||
After this comes four "int"s of '''garbage'''. Space occupied by random values like this is common in the data files, and indicates that something stored in memory at this relative position was written to disk even though it wouldn't be meaningful on disk (probably pointers or uninitialized memory in a space that was being reserved for possible future use). The first two 32-bit fields are, however, used in | After this comes four "int"s of '''garbage'''. Space occupied by random values like this is common in the data files, and indicates that something stored in memory at this relative position was written to disk even though it wouldn't be meaningful on disk (probably pointers or uninitialized memory in a space that was being reserved for possible future use). The first two 32-bit fields are, however, used in .oni files generated by OniSplit, and the last 32-bit field is partly used by OniX for a new form of template versioning. Future usage of these fields by OniSplit and/or OniX may change (hopefully not too much). | ||
That concludes the header of the instance file. Immediately after this header, we find the instance descriptors array. | That concludes the header of the instance file. Immediately after this header, we find the instance descriptors array. | ||