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pngunknown.c: handle unknown IDAT

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This is the test backported from 1.7 to ensure that when treating IDATs as
unknown the test does not fail if there are more than one IDAT chunks in the
file.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler 2016-01-18 19:19:14 -08:00
parent 0873ae8242
commit 7f576964d8
1 changed files with 14 additions and 0 deletions
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14
contrib/libtests/pngunknown.c
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@ -1002,6 +1002,20 @@ perform_one_test(FILE *fp, int argc, const char **argv,
def = check(fp, argc, argv, flags[1], d, set_callback);
/* If IDAT is being handled as unknown the image read is skipped and all the
* IDATs after the first end up in the end info struct, so in this case add
* IDAT to the list of unknowns. (Do this after 'check' above sets the
* chunk_info 'keep' fields.)
*
* Note that the flag setting has to be in the 'known' field to avoid
* triggeriing the consistency check below and the flag must only be set if
* there are multiple IDATs, so if the check above did find an unknown IDAT
* after IDAT.
*/
if (chunk_info[0/*IDAT*/].keep != PNG_HANDLE_CHUNK_AS_DEFAULT &&
(flags[1][3] & PNG_INFO_IDAT) != 0)
flags[0][2] |= PNG_INFO_IDAT;
/* Chunks should either be known or unknown, never both and this should apply
* whether the chunk is before or after the IDAT (actually, the app can
* probably change this by swapping the handling after the image, but this