Add APIs for limited use of document tagged code.

public/fpdf_doc.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 PUBLIC_FPDF_DOC_H_
 #define PUBLIC_FPDF_DOC_H_
 
 // NOLINTNEXTLINE(build/include)
@@ skipping 50 matching lines @@
 //
 //   bookmark - handle to the bookmark.
 //   buffer   - buffer for the title. May be NULL.
 //   buflen   - the length of the buffer in bytes. May be 0.
 //
 // Returns the number of bytes in the title, including the terminating NUL
 // character. The number of bytes is returned regardless of the |buffer| and
 // |buflen| parameters.
 //
 // Regardless of the platform, the |buffer| is always in UTF-16LE encoding. The
-// string is terminated by a UTF16 NUL character. If |buflen| is less then the
+// string is terminated by a UTF16 NUL character. If |buflen| is less than the
 // required length, or |buffer| is NULL, |buffer| will not be modified.
 DLLEXPORT unsigned long STDCALL FPDFBookmark_GetTitle(FPDF_BOOKMARK bookmark,
                                                       void* buffer,
                                                       unsigned long buflen);
 
 // Find the bookmark with |title| in |document|.
 //
 //   document - handle to the document.
 //   title    - the UTF-16LE encoded Unicode title for which to search.
 //
@@ skipping 53 matching lines @@
 //
 //   action - handle to the action. |action| must be a |PDFACTION_LAUNCH| or
 //            |PDFACTION_REMOTEGOTO|
 //   buffer - a buffer for output the path string. May be NULL.
 //   buflen - the length of the buffer, in bytes. May be 0.
 //
 // Returns the number of bytes in the file path, including the trailing UTF16
 // NUL character.
 //
 // Regardless of the platform, the |buffer| is always in UTF-16LE encoding.
-// If |buflen| is less then the returned length, or |buffer| is NULL, |buffer|
+// If |buflen| is less than the returned length, or |buffer| is NULL, |buffer|
 // will not be modified.
 DLLEXPORT unsigned long STDCALL
 FPDFAction_GetFilePath(FPDF_ACTION action, void* buffer, unsigned long buflen);
 
 // Get the URI path of a |PDFACTION_URI| |action|.
 //
 //   document - handle to the document.
 //   action   - handle to the action. Must be a |PDFACTION_URI|.
 //   buffer   - a buffer for the path string. May be NULL.
 //   buflen   - the length of the buffer, in bytes. May be 0.
 //
 // Returns the number of bytes in the URI path, including trailing zeros.
 //
-// The |buffer| is always encoded in 7-bit ASCII. If |buflen| is less then the
+// The |buffer| is always encoded in 7-bit ASCII. If |buflen| is less than the
 // returned length, or |buffer| is NULL, |buffer| will not be modified.
 DLLEXPORT unsigned long STDCALL FPDFAction_GetURIPath(FPDF_DOCUMENT document,
                                                       FPDF_ACTION action,
                                                       void* buffer,
                                                       unsigned long buflen);
 
 // Get the page index of |dest|.
 //
 //   document - handle to the document.
 //   dest     - handle to the destination.
@@ skipping 146 matching lines @@
 DLLEXPORT unsigned long STDCALL FPDF_GetPagelLabel(FPDF_DOCUMENT document,
                                                    int page_index,
                                                    void* buffer,
                                                    unsigned long buflen);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
 
 #endif  // PUBLIC_FPDF_DOC_H_