Bug 703336: Fix GPL crash with jpg input on 64bit windows.

The Jpeg code uses setjmp/longjmp for error handling. On Windows at
least, in 64bit builds, jmpbufs need to be 16 byte aligned. This is
generally achieved by malloc blocks being 16 byte aligned, and
structures have their offsets calculated so that their contents lie
at appropriate positions.

Unfortunately, our malloc routines only align to 8 byte aligned.

We therefore bend the jpgtop.c code to align the jmpbuf manually.

Similar tricks are required in the pngtop.c code, which also uses
setjmp/longjmp, but a slightly different approach has to be taken
as the png routine allocates the structure with the callback in
itself, so we don't get to align just that. Instead, we modify the
allocation routines that we provide to pnglib so that blocks are
correctly padded.

0 files changed, 0 insertions, 0 deletions