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The name will normally be a full path name as it is returned by either one of the file discovery callbacks<br />
or the internal version of kpse.find_file().<br />
success<br />
Return false when a fatal error occurred (e. g. when the file cannot be found, after all).<br />
data<br />
The bytes comprising the file.<br />
data_size<br />
The length of the data, in bytes.<br />
Return an empty string and zero if the file was found but there was a reading problem.<br />
The list of functions is as follows:<br />
read_font_file ofm or tfm files<br />
read_vf_file virtual fonts<br />
read_map_file map files<br />
read_enc_file encoding files<br />
read_sfd_file subfont definition files<br />
read_pk_file pk bitmap files<br />
read_data_file embedded files (\<strong>pdf</strong>obj file ...)<br />
read_truetype_file TrueType font files<br />
read_type1_file Type1 font files<br />
read_opentype_file OpenType font files<br />
4.1.3 Data processing callbacks<br />
4.1.3.1 process_input_buffer<br />
This callback allows you to change the contents of the line input buffer just before LuaTEX actually starts<br />
looking at it.<br />
function( buffer)<br />
return adjusted_buffer<br />
end<br />
If you return nil, LuaTEX will pretend like your callback never happened. You can gain a small amount<br />
of processing time from that.<br />
This callback does not replace any internal code.<br />
36<br />
LuaTEX Lua Libraries
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