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fix handling of tags in custom directories which happen to match standard tags but are defined differently in the custom dir

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This commit is contained in:
Frank Warmerdam 2012-05-30 04:58:13 +00:00
parent 047f4120df
commit 79a2449b27
2 changed files with 32 additions and 6 deletions
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5
ChangeLog
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@ -1,5 +1,10 @@
2012-05-29 Frank Warmerdam <warmerdam@google.com>
* libtiff/tif_dir.c: avoid using specific set/get logic to process fields in custom directories,
like EXIF directories. This fixes problems like a tag "320" existing in a custom directory getting
processed as if it were a colormap when it isn't really. Damn the wide variety of argument formulations
to get/set functions for different tags!
* libtiff/tif_dir.c: Ensure that we keep track of when tif_rawdata
is a pointer into an mmap()ed file via TIFF_BUFFERMMAP flag.

33
libtiff/tif_dir.c
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@ -1,4 +1,4 @@
/* $Id: tif_dir.c,v 1.109 2012-05-24 01:03:37 fwarmerdam Exp $ */
/* $Id: tif_dir.c,v 1.110 2012-05-30 04:58:13 fwarmerdam Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -161,8 +161,20 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
int status = 1;
uint32 v32, i, v;
char* s;
const TIFFField *fip = TIFFFindField(tif, tag, TIFF_ANY);
uint32 standard_tag = tag;
switch (tag) {
/*
* We want to force the custom code to be used for custom
* fields even if the tag happens to match a well known
* one - important for reinterpreted handling of standard
* tag values in custom directories (ie. EXIF)
*/
if (fip->field_bit == FIELD_CUSTOM) {
standard_tag = 0;
}
switch (standard_tag) {
case TIFFTAG_SUBFILETYPE:
td->td_subfiletype = (uint32) va_arg(ap, uint32);
break;
@ -427,7 +439,6 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
default: {
TIFFTagValue *tv;
int tv_size, iCustom;
const TIFFField *fip = TIFFFindField(tif, tag, TIFF_ANY);
/*
* This can happen if multiple images are open with different
@ -799,8 +810,20 @@ _TIFFVGetField(TIFF* tif, uint32 tag, va_list ap)
{
TIFFDirectory* td = &tif->tif_dir;
int ret_val = 1;
uint32 standard_tag = tag;
const TIFFField* fip = TIFFFindField(tif, tag, TIFF_ANY);
/*
* We want to force the custom code to be used for custom
* fields even if the tag happens to match a well known
* one - important for reinterpreted handling of standard
* tag values in custom directories (ie. EXIF)
*/
if (fip->field_bit == FIELD_CUSTOM) {
standard_tag = 0;
}
switch (tag) {
switch (standard_tag) {
case TIFFTAG_SUBFILETYPE:
*va_arg(ap, uint32*) = td->td_subfiletype;
break;
@ -975,8 +998,6 @@ _TIFFVGetField(TIFF* tif, uint32 tag, va_list ap)
break;
default:
{
const TIFFField* fip =
TIFFFindField(tif, tag, TIFF_ANY);
int i;
/*