tree fe927996ffd86d93f9ab9795c424097354fe11ec
parent f06cc1200fd5f61b63479d7099ccf4a7457a89bd
author DRC <information@libjpeg-turbo.org> 1462932242 -0500
committer DRC <information@libjpeg-turbo.org> 1462933815 -0500

Don't allow opaque source/dest mgrs to be swapped

Calling jpeg_stdio_dest() followed by jpeg_mem_dest(), or jpeg_mem_src()
followed by jpeg_stdio_src(), is dangerous, because the existing opaque
structure would not be big enough to accommodate the new source/dest
manager.  This issue was non-obvious to libjpeg-turbo consumers, since
it was only documented in code comments.  Furthermore, the issue could
also occur if the source/dest manager was allocated by the calling
program, but it was not allocated with enough space to accommodate the
opaque stdio or memory source/dest manager structs.  The safest thing to
do is to throw an error if one of these functions is called when there
is already a source/dest manager assigned to the object and it was
allocated elsewhere.

Closes #78, #79