Added tiff:ignore-tags to ignore specific tags.

diff --git a/coders/tiff.c b/coders/tiff.c
index 63bdb43a84d223c504a759bb14bf45973c8b2892..d2e4f563c873ccb7917f9066bd42e9143069d9b1 100644 (file)
--- a/coders/tiff.c
+++ b/coders/tiff.c
@@ -1844,6 +1844,72 @@ RestoreMSCWarning
 static TIFFExtendProc
   tag_extender = (TIFFExtendProc) NULL;
 
+static void TIFFIgnoreTags(TIFF *tiff)
+{
+  char
+    *q;
+
+  const char
+    *p,
+    *tags;
+
+  Image
+   *image;
+
+  TIFFFieldInfo
+    *ignore;
+
+  register ssize_t
+    i;
+
+  size_t
+    count;
+
+  image=(Image *)TIFFClientdata(tiff);
+  tags=GetImageArtifact(image,"tiff:ignore-tags");
+  if (tags == (const char *) NULL)
+    return;
+  count=0;
+  p=tags;
+  while (*p != '\0')
+  {
+    while ((isspace((int) ((unsigned char) *p)) != 0))
+      p++;
+
+    (void) strtol(p,&q,10);
+    if (p == q)
+      return;
+
+    p=q;
+    count++;
+
+    while ((isspace((int) ((unsigned char) *p)) != 0) || (*p == ','))
+      p++;
+  }
+  if (count == 0)
+    return;
+  i=0;
+  p=tags;
+  ignore=(TIFFFieldInfo *) AcquireQuantumMemory(count,sizeof(*ignore));
+  // This also sets field_bit to 0 (FIELD_IGNORE)
+  ResetMagickMemory(ignore,0,count*sizeof(*ignore));
+  while (*p != '\0')
+  {
+    while ((isspace((int) ((unsigned char) *p)) != 0))
+      p++;
+
+    ignore[i].field_tag=(ttag_t) strtol(p,&q,10);
+
+    p=q;
+    i++;
+
+    while ((isspace((int) ((unsigned char) *p)) != 0) || (*p == ','))
+      p++;
+  }
+  (void) TIFFMergeFieldInfo(tiff,ignore,(uint32) count);
+  ignore=(TIFFFieldInfo *) RelinquishMagickMemory(ignore);
+}
+
 static void TIFFTagExtender(TIFF *tiff)
 {
   static const TIFFFieldInfo
@@ -1859,6 +1925,7 @@ static void TIFFTagExtender(TIFF *tiff)
     sizeof(*TIFFExtensions));
   if (tag_extender != (TIFFExtendProc) NULL)
     (*tag_extender)(tiff);
+  TIFFIgnoreTags(tiff);
 }
 #endif