Macintosh-SW/syncfiles
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syncfiles/gen
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Dietrich Epp ca074ce387 Write conversion from script and region to charmap 
The generation tool creates a GetCharmap function in C which takes the
script and region as input and returns the charmap index.
2022-03-15 14:31:12 -04:00
..
charmap
.gitignore
data.go
go.mod
go.sum
main.go Write conversion from script and region to charmap 2022-03-15 14:31:12 -04:00
README.md
scriptmap.go Write conversion from script and region to charmap 2022-03-15 14:31:12 -04:00

README.md

Character Conversion Tables

Used by SyncFiles.

This program generates the tables necessary to convert from UTF-8 to Mac OS Roman.

The conversion process is entirely table-driven. The table maps a (state, input) pair to a (state, output) pair. The initial state is 0. A transition to state 0 is considered invalid.

A transition may have both a state and output. This means that the input may be translated in different ways depending on the bytes that follow. The translation code prefers the longest path through the state table that results in an output.

The table is compressed with PackBits to reduce its size by a factor of 22x.