Add APIs for getting bookmarks and named destinations.

fpdfsdk/include/fpdfdoc.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef _FPDFDOC_H_
 #define _FPDFDOC_H_
 
 #include "fpdfview.h"
 
 // Exported Functions
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+// Function: FPDFBookmark_GetFirstChild
+//                      Get the first child of a bookmark item, or the first top level bookmark item.
+// Parameters:
+//                      document        -       Handle to the document. Returned by FPDF_LoadDocument or FPDF_LoadMemDocument.
+//                      bookmark        -       Handle to the current bookmark. Can be NULL if you want to get the first top level item.
+// Return value:
+//                      Handle to the first child or top level bookmark item. NULL if no child or top level bookmark found.
+//
+DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetFirstChild(FPDF_DOCUMENT document, FPDF_BOOKMARK bookmark);
+
+// Function: FPDFBookmark_GetNextSibling
+//                      Get next bookmark item at the same level.
+// Parameters:
+//                      document        -       Handle to the document. Returned by FPDF_LoadDocument or FPDF_LoadMemDocument.
+//                      bookmark        -       Handle to the current bookmark. Cannot be NULL.
+// Return value:
+//                      Handle to the next bookmark item at the same level. NULL if this is the last bookmark at this level.
+//
+DLLEXPORT FPDF_BOOKMARK STDCALL FPDFBookmark_GetNextSibling(FPDF_DOCUMENT document, FPDF_BOOKMARK bookmark);
+
+// Function: FPDFBookmark_GetTitle
+//                      Get title of a bookmark.
+// Parameters:
+//                      bookmark        -       Handle to the bookmark.
+//                      buffer          -       Buffer for the title. Can be NULL.
+//          buflen      -   The length of the buffer in bytes. Can be 0.
+// Return value:
+//                      Number of bytes the title consumes, including trailing zeros.
+// Comments:
+//                      Regardless of the platform, the title is always in UTF-16LE encoding. That means the buffer
+//          can be treated as an array of WORD (on Intel and compatible CPUs), each WORD representing the Unicode of
+//          a character(some special Unicode may take 2 WORDs).The string is followed by two bytes of zero
+//          indicating the end of the string.
+//
+//          The return value always indicates the number of bytes required for the buffer, even if no buffer is specified
+//          or the buffer size is less then required. In these cases, the buffer will not be modified.
+//
+DLLEXPORT unsigned long STDCALL FPDFBookmark_GetTitle(FPDF_BOOKMARK bookmark, void* buffer, unsigned long buflen);
+
 // Function: FPDFBookmark_Find
 //                      Find a bookmark in the document, using the bookmark title.
 // Parameters: 
 //                      document        -       Handle to the document. Returned by FPDF_LoadDocument or FPDF_LoadMemDocument.
 //                      title           -       The UTF-16LE encoded Unicode string for the bookmark title to be searched. Can't be NULL.
 // Return value:
 //                      Handle to the found bookmark item. NULL if the title can't be found.
 // Comments:
 //                      It always returns the first found bookmark if more than one bookmarks have the same title.
 //
@@ skipping 194 matching lines @@
 //
 DLLEXPORT unsigned long STDCALL FPDF_GetMetaText(FPDF_DOCUMENT doc, FPDF_BYTESTRING tag,
                                                                                                  void* buffer, unsigned long buflen);
 
 
 #ifdef __cplusplus
 };
 #endif
 
 #endif  // _FPDFDOC_H_