[fpc-pascal] paszlib problem: integer overflow

Dennis Poon dennis at avidsoft.com.hk
Thu Nov 14 18:15:28 CET 2013

I works fine on my Delphi 5 until I try to compress a file with size
>>> of 70M and it raises the exception of integer flow error.
> That means you enabled that somehow. Integer under/overflow is generally not
> enabled by default, and it is somewhat unlogical to use it with converted C
> code.
>>> I initially thought it might be a Delphi 5 problem so I tried to use
>>> Lazarus with fpc 2.6.2 to compile the same problem but it kept
>>> complaining cannot find zstream although I already add FCL package to
>>> the required packages list.
> Probably cause by providing external paszlib sources, in combination with
> precompiled already there paszlib sources, the compiler gets confused what
> depends on what.
> Forget about the -sg code for Lazarus, simply use the FPC provided one only.
> Turn off the range checks, and try again.

I'd love to just use the paszlib in Lazarus/fpc but I also need the same 
unit for Delphi 5 (Dephi 5 program will compress data and send to linux 
/lazarus/fpc program ) so both sides need to understand the same 
compress/decompress protocol.
I tried using the lazarus/fpc paszlib unit in Dephi 5 but it does not 
compile. Too many errors.
The paszlib-sg is the only pascal unit that produces compressed data 
readable by FPC's zstream and zipper units.



More information about the fpc-pascal mailing list