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syncfiles/Formats.md
Dietrich Epp f94a65d245 Generate conversion data for extended ASCII 
This creates conversion tables for 11 of the 21 character sets.
2022-03-15 16:19:56 -04:00

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Table Formats

Each character map table starts with a single nonzero byte, indicating the table's format.

Extended ASCII

Format 1 is for "extended ASCII". Encoded values 0-127 are identical to ASCII, and encoded values 128-255 are mapped to single Unicode characters.

The table contains 128 entries, for encoded values 128-255, with the following format:

u8    Length of Unicode character
u8[]  Unicode character, UTF-8
u8    Length of normalized Unicode character, may be zero
u8[]  Unicode character in NFD normal form, UTF-8

The second copy of the character is only present if the character decomposes into multiple characters.