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When a header is added, the chunk changes from CH_ARRAY type to
CH_TABLE type.
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We won't be able to make it fully self-descriptive (looking at you
MAP-chunks), but anything else can. With this framework, we can
add headers for each chunk explaining how each chunk looks like
in detail.
They also will all be tables, making it a lot easier to read in
external tooling, and opening the way to consider a database
(like SQLite) to use as savegame format.
Lastly, with the headers in the savegame, you can freely add
fields without needing a savegame version bump; older versions
of OpenTTD will simply ignore the new field. This also means
we can remove all the SLE_CONDNULL, as they are irrelevant.
The next few commits will start using this framework.
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This adds two byte extra to those chunks, and might feel a bit
silly at first. But in later changes we will prefix CH_ARRAY with
a table header, and then this change shines.
Without this, we could still add headers to these chunks, but any
external reader wouldn't know if the CH_RIFF has them or not. This
way is much more practical, as they are now more like any other
chunk.
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Co-Authored-By: Patric Stout <truebrain@openttd.org>
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"unsafe" functions to prevent them from being used, and thus having to care about certain aspects of their return values
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instead of showing the "savegame corrupted" message
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checking savegames (empty for now).
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In the first phase, indexes are stored. In the second phase, indexes are checked for validity and converted to pointers
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