Changes per discussion with Anton

include/dart_api.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 1461 matching lines @@
  * \param length Used to return the length of the array which was
  *   actually used.
  *
  * \return A valid handle if no error occurs during the operation.
  */
 DART_EXPORT Dart_Handle Dart_StringToUTF8(Dart_Handle str,
                                           uint8_t** utf8_array,
                                           intptr_t* length);
 
 /**
+ * Gets the data corresponding to the string object. This function returns
+ * the data only for Latin-1 (ISO-8859-1) string objects. For all other
+ * string objects it return and error.
+ *
+ * \param str A string.
+ * \param latin1_array An array allocated by the caller, used to return
+ *   the string data.
+ * \param length Used to pass in the length of the provided array.
+ *   Used to return the length of the array which was actually used.
+ *
+ * \return A valid handle if no error occurs during the operation.
+ */
+DART_EXPORT Dart_Handle Dart_StringToLatin1(Dart_Handle str,
+                                            uint8_t* latin1_array,
+                                            intptr_t* length);
+
+/**
  * Gets the UTF-16 encoded representation of a string.
  *
  * \param str A string.
  * \param utf16_array An array allocated by the caller, used to return
  *   the array of UTF-16 encoded characters.
  * \param length Used to pass in the length of the provided array.
  *   Used to return the length of the array which was actually used.
  *
  * \return A valid handle if no error occurs during the operation.
  */
@@ skipping 18 matching lines @@
  * The original object is morphed into an external string object.
  *
  * \param array External space into which the string data will be
  *   copied into. This must not move.
  * \param length The size in bytes of the provided external space (array).
  * \param peer An external pointer to associate with this string.
  * \param cback A callback to be called when this string is finalized.
  *
  * \return the converted ExternalString object if no error occurs.
  *   Otherwise returns an error handle.
+ *   If the object is a valid string but if it cannot be externalized
+ *   then Dart_Null() is returned and the string data is copied into
+ *   the external space specified.
  *
  * For example:
  *  intptr_t size;
  *  Dart_Handle result;
  *  result = DartStringStorageSize(str, &size);
  *  void* data = malloc(size);
  *  result = Dart_MakeExternalString(str, data, size, NULL, NULL);
  *
  */
 DART_EXPORT Dart_Handle Dart_MakeExternalString(Dart_Handle str,
@@ skipping 1239 matching lines @@
  *
  * \param object An object.
  * \param peer A value to store in the peer field.
  *
  * \return Returns an error if 'object' is a subtype of Null, num, or
  *   bool.
  */
 DART_EXPORT Dart_Handle Dart_SetPeer(Dart_Handle object, void* peer);
 
 #endif  // INCLUDE_DART_API_H_