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so they align with the manpages.
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For small images, it could happen that the output stream would not be
flushed before exit(), resulting in a lack of error-reporting on
a full device. Using fflush(), a function I first introduced in sbase,
we do the flushing before returning manually and report errors if they
occurred.
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First of all, there was lots of libjpeg-specific cruft that just didn't
have any right to exist (METHODDEF(), strange typedefs, use of the
internal memory pool for no reason). This is gone now.
Additionally, we make use of the save and proven utility functions and
in general the code should be more well-separated now.
What is left to do is clear up the part where we mix the colors with the
mask.
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In case of unexpected end of file errno is not set, and strerror(errno)
returns "Success". Caller should distinguish between error and EOF by
calling ferror(3) as described in fread(3).
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This may come as a surprise, but I'd like the libraries to handle
these cases.
Maybe some day libpng supports 0x0 images, so why impose artificial
limits here?
Same with ppm.
For me, an ideal data converter loses as little information as possible.
In mixed cases (dimensions 0xn, where n > 0) we could print a warning,
but here, 2 principles come at play:
- GIGO (garbage in, garbage out)
- no information loss if possible
Given the code later on won't try to access the malloc(0) region, we
are also all safe.
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