Re: Read ieee-754-2008 four-byte floating-point number from binary file?

[Luis Carvalho <lexcarvalho@...>]

> I'm reading some files in an existing binary format, which include 4-byte
> floating-point numbers. I have the file's contents loaded into a string. I
> need a function which will parse one floating-point number from the string,
> given the index of the first byte. Does Lua's library provide this? Or
> should I throw something together with the bitop library? 

Take a look at Roberto's struct library,

http://www.inf.puc-rio.br/~roberto/struct/

or LHF's lpack,

http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/

Using the former:

$ lua -lstruct -e 'print(struct.unpack("f", struct.pack("f", math.pi), 1))'
3.1415927410126	5

Cheers,
Luis

-- 
Computers are useless. They can only give you answers.
                -- Pablo Picasso

-- 
Luis Carvalho (Kozure)
lua -e 'print((("lexcarvalho@NO.gmail.SPAM.com"):gsub("(%u+%.)","")))'