Open FPDF_PAGEOBJECTMARK API.

Initially it contains:
- FPDFPageObj_CountMarks
- FPDFPageObj_GetMark
- FPDFPageObjMark_GetName

This allows reading the content marks from a page object.

Bug: pdfium:1037
Change-Id: I3d7554b71f938778890fdb44088e0d45dd2718d9
Reviewed-on: https://pdfium-review.googlesource.com/28710
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/public/fpdf_edit.h b/public/fpdf_edit.h
index 1e84e8f7ff..7c37b83aa9 100644
--- a/public/fpdf_edit.h
+++ b/public/fpdf_edit.h
@@ -281,6 +281,40 @@ FPDF_EXPORT void FPDF_CALLCONV FPDFPage_TransformAnnots(FPDF_PAGE page,
 FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
 FPDFPageObj_NewImageObj(FPDF_DOCUMENT document);
 
+// Get number of content marks in |page_object|.
+//
+//   page_object - handle to a page object.
+//
+// Returns the number of content marks in |page_object|, or -1 in case of
+// failure.
+FPDF_EXPORT int FPDF_CALLCONV
+FPDFPageObj_CountMarks(FPDF_PAGEOBJECT page_object);
+
+// Get content mark in |page_object| at |index|.
+//
+//   page_object - handle to a page object.
+//   index       - the index of a page object.
+//
+// Returns the handle to the content mark, or NULL on failure. The handle is
+// still owned by the library, and it should not be freed directly. It becomes
+// invalid if the page object is destroyed, either directly or indirectly by
+// unloading the page.
+FPDF_EXPORT FPDF_PAGEOBJECTMARK FPDF_CALLCONV
+FPDFPageObj_GetMark(FPDF_PAGEOBJECT page_object, unsigned long index);
+
+// Get name of a content mark. |buffer| is only modified if |buflen| is longer
+// than the length of the name.
+//
+//   mark   - handle to a content mark.
+//   buffer - buffer for holding the returned name in UTF16-LE.
+//   buflen - length of the buffer.
+//
+// Returns the length of the name.
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDFPageObjMark_GetName(FPDF_PAGEOBJECTMARK mark,
+                        void* buffer,
+                        unsigned long buflen);
+
 // Load an image from a JPEG image file and then set it into |image_object|.
 //
 //   pages        - pointer to the start of all loaded pages, may be NULL.
diff --git a/public/fpdfview.h b/public/fpdfview.h
index ffa4678347..de7fbe4663 100644
--- a/public/fpdfview.h
+++ b/public/fpdfview.h
@@ -46,6 +46,7 @@ typedef void* FPDF_LINK;
 typedef void* FPDF_PAGE;
 typedef void* FPDF_PAGELINK;
 typedef void* FPDF_PAGEOBJECT;  // Page object(text, path, etc)
+typedef void const* FPDF_PAGEOBJECTMARK;
 typedef void* FPDF_PAGERANGE;
 typedef void* FPDF_RECORDER;
 typedef void* FPDF_SCHHANDLE;