grk_image_meta_set_field: support "xml" field

Author: Grok Compression

src/lib/core/grok.cpp

@@ -413,6 +413,11 @@ static bool resolve_meta_field(grk_image_meta* meta, const char* field, uint8_t*
     *buf_pp = &meta->exif_buf;
     *len_pp = &meta->exif_len;
   }
+  else if(strcmp(field, "xml") == 0)
+  {
+    *buf_pp = &meta->xml_buf;
+    *len_pp = &meta->xml_len;
+  }
   else
   {
     return false;

src/lib/core/grok.h

@@ -1186,7 +1186,7 @@ GRK_API grk_image_meta* GRK_CALLCONV grk_image_meta_new(void);
  *
  * @param meta   pointer to an existing grk_image_meta
  * @param field  which metadata field to set:
- *               "geotiff", "ipr", "xmp", "iptc", "exif"
+ *               "geotiff", "ipr", "xmp", "iptc", "exif", "xml"
  * @param data   pointer to source bytes (copied internally)
  * @param len    number of bytes to copy
  * @return true on success, false on invalid field name or OOM
@@ -1202,7 +1202,7 @@ GRK_API bool GRK_CALLCONV grk_image_meta_set_field(grk_image_meta* meta, const c
  *
  * @param meta      pointer to an existing grk_image_meta
  * @param field     which metadata field to get:
- *                  "geotiff", "ipr", "xmp", "iptc", "exif"
+ *                  "geotiff", "ipr", "xmp", "iptc", "exif", "xml"
  * @param[out] data set to internal buffer pointer (do not free)
  * @param[out] len  set to buffer length
  * @return true on success (even if data is NULL/empty), false on invalid field