02-17-2010
Quote:
Originally Posted by
Corona688
That is not the minimal code to crash it... it works absolutely fine.
I was afraid of that. This is part of a huge project, so I tried to extract what I could to make it fail without involving too much complexity. In particular, the actual code is using the
Pari library.
Quote:
Originally Posted by
Corona688
The crash is probably in some destructor somewhere. Or it may be that you've already corrupted the heap by the time you've started calling fread, maybe with that pari_sp object? Try getting it down to a really minimal program that still crashes.
Working on it. The pari_sp isn't actually doing anything at the moment (it was going to be a part of the garbage collection process) so I know that's not it.
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LEARN ABOUT DEBIAN
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)