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this is the same as cp850, but with the euro symbol replacing the
lowercase dotless i at 0xd5. it is significant because it's used by
thermal receipt printers.
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previously, 8-bit codepages could only remap the high 128 bytes; the
low range was assumed/forced to agree with ascii. interpretation of
codepage table headers has been changed so that it's possible to
represent mappings for up to 256 slots (fewer if the initial portion
of the map is elided because it coincides with unicode codepoints).
this requires consuming a bit more of the 10-bit space of characters
that can be represented in 8-bit codepages, but there's still a plenty
left. the size of the legacy_chars table is actually reduced now by
eliding the first 256 entries and considering them to map implicitly
via the identity map.
before these changes, there seem to have been minor bugs/omissions in
codepage table generation, so it's likely that some actual bug fixes
are silently included in this commit. round-trip testing of a few
codepages was performed on the new version of the code, but no
differential testing against the old version was done.
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perhaps some additional legacy DOS-era codepages would also be useful
to have, but these are the ones for which there has been demand. the
size of the diff is due to the fact that legacychars.h is updated in
such a way that new characters are inserted into the table in unicode
codepoint order; thus other mappings in codepages.h have changed to
reflect the new table indices of their characters.
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