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Workaround for incorrect TIFFs with ExtraSamples == 999 produced by Corel

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Draw. As per bug http://bugzilla.remotesensing.org/show_bug.cgi?id=1490
This commit is contained in:
Andrey Kiselev 2007-02-22 14:07:16 +00:00
parent a128f8e5b5
commit 2e0f36bb30
1 changed files with 26 additions and 9 deletions
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33
libtiff/tif_dir.c
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@ -1,4 +1,4 @@
/* $Id: tif_dir.c,v 1.74 2006-10-12 16:50:55 dron Exp $ */
/* $Id: tif_dir.c,v 1.75 2007-02-22 14:07:16 dron Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -74,21 +74,37 @@ void _TIFFsetDoubleArray(double** dpp, double* dp, uint32 n)
static int
setExtraSamples(TIFFDirectory* td, va_list ap, uint32* v)
{
/* XXX: Unassociated alpha data == 999 is a known Corel Draw bug, see below */
#define EXTRASAMPLE_COREL_UNASSALPHA 999
uint16* va;
uint32 i;
*v = va_arg(ap, uint32);
if ((uint16) *v > td->td_samplesperpixel)
return (0);
return 0;
va = va_arg(ap, uint16*);
if (*v > 0 && va == NULL) /* typically missing param */
return (0);
for (i = 0; i < *v; i++)
if (va[i] > EXTRASAMPLE_UNASSALPHA)
return (0);
return 0;
for (i = 0; i < *v; i++) {
if (va[i] > EXTRASAMPLE_UNASSALPHA) {
/*
* XXX: Corel Draw is known to produce incorrect
* ExtraSamples tags which must be patched here if we
* want to be able to open some of the damaged TIFF
* files:
*/
if (va[i] == EXTRASAMPLE_COREL_UNASSALPHA)
va[i] = EXTRASAMPLE_UNASSALPHA;
else
return 0;
}
}
td->td_extrasamples = (uint16) *v;
_TIFFsetShortArray(&td->td_sampleinfo, va, td->td_extrasamples);
return (1);
return 1;
#undef EXTRASAMPLE_COREL_UNASSALPHA
}
static uint32
@ -343,7 +359,8 @@ _TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
_TIFFsetLongArray(&td->td_subifd, va_arg(ap, uint32*),
(long) td->td_nsubifd);
} else {
TIFFErrorExt(tif->tif_clientdata, module, "%s: Sorry, cannot nest SubIFDs",
TIFFErrorExt(tif->tif_clientdata, module,
"%s: Sorry, cannot nest SubIFDs",
tif->tif_name);
status = 0;
}