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With this change, all 32-bit values read from untrusted data through
read_value are compared unmodified in order to prevent unintended
integer overflows during the comparison.
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This adds a custom memory management layer between libjpeg and the calling
app - in such a way that the code can be shared between mupdf and
Ghostscript/PDL.
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There are two issues where variables may be used unitialized:
* extract_exif_resolution fails to set xres and yres for JPEG images if
there's no valid resolution unit (mainly affects XPS documents)
* xps_measure_font_glyph uses hadv and vadv unitialized if the glyph id
isn't valid (i.e. if FT_Get_Advance fails)
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XPS extracts the resolution of a JPEG image from the image data. The
current code however only reads the density values provided by JFIF
metadata, while the XPS specification also allows for resolution to be
in either EXIF metadata or Photoshop's APP13 chunk. This patch adds
code for reading both kinds of metadata in order to get more consistent
behavior with Microsoft's XPS Viewer. Documents for reproducing this issue:
2093*.xps, 2249*.xps, 2252*.xps, 2268*.xps and "jpeg exif resolution.xps".
Another detail: The default resolution for JPEG images in XPS documents
is 96 DPI and not 72 DPI.
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