Hello list,
I am currently writing some FFI code that interfaces with libtiff to read tags from TIFF image files. The values of these tags have different C types and using the right type is needed to avoid memory corruption.
For reading tags with uint16 values the code is straightforward:
``` static ___SCMOBJ uint16_tag(TIFF *tiff, ttag_t tag) { uint16 val; int ret = TIFFGetField(tiff, tag, &val);
return ret == 1 ? ___FIX(val) : ___FAL; } ```
But, since fixnums have less than 32 bits I cannot use the same code. It seems the solution would be something similar to:
``` static ___SCMOBJ uint32_tag(TIFF *tiff, ttag_t tag) { uint32 val;
if(TIFFGetField(tiff, tag, &val) == 1) { ___SCMOBJ ret; ___U32_to_SCMOBJ(___ps, val, &ret, ___RETURN_POS); <---- ERROR return ret; } else { return ___FAL; } }
```
except that I don't know how to get hold of the processor state. Can anybody shed a light here?
Thanks, -alex http://unendli.ch/