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In my continuing saga of PDF’s and raster images, I
need to translate names (like John Smith) from ASCII to EBCDIC. Thus ‘Abcd’
(hex => X’41626364’) would become X’C1828384’. Usually this is done with a table lookup, i.e. the character
to be translated is used as a binary offset into a 256 byte table of the
translated characters. Thus at position X’41’ in this table would
be x’C1’ facilitating the translation of the ASCII ‘A’
into its EBCDIC equivalent. How does one go about doing this in Lua? |