Create new FPDFPageObjMark_CountParams() API.

Bug: pdfium:1037
Change-Id: I1b7035eb199f9dd1d730b0b1112aa455f0fabcc2
Reviewed-on: https://pdfium-review.googlesource.com/30870
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

4 files changed, 28 insertions, 0 deletions

diff --git a/fpdfsdk/fpdf_edit_embeddertest.cpp b/fpdfsdk/fpdf_edit_embeddertest.cpp
index 80191556f3..8f54bf8eab 100644
--- a/fpdfsdk/fpdf_edit_embeddertest.cpp
+++ b/fpdfsdk/fpdf_edit_embeddertest.cpp
@@ -468,11 +468,14 @@ TEST_F(FPDFEditEmbeddertest, RemoveMarkedObjectsPrime) {
           GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
       if (name == L"Prime") {
         prime_count++;
+        EXPECT_EQ(0, FPDFPageObjMark_CountParams(mark));
         primes.push_back(page_object);
       } else if (name == L"Square") {
         square_count++;
+        EXPECT_EQ(1, FPDFPageObjMark_CountParams(mark));
       } else if (name == L"GreaterThanTen") {
         greater_than_ten_count++;
+        EXPECT_EQ(0, FPDFPageObjMark_CountParams(mark));
       } else {
         FAIL();
       }
diff --git a/fpdfsdk/fpdf_editpage.cpp b/fpdfsdk/fpdf_editpage.cpp
index 20d88942c8..7a8bbabf2d 100644
--- a/fpdfsdk/fpdf_editpage.cpp
+++ b/fpdfsdk/fpdf_editpage.cpp
@@ -269,6 +269,21 @@ FPDFPageObjMark_GetName(FPDF_PAGEOBJECTMARK mark,
       buflen);
 }
 
+FPDF_EXPORT int FPDF_CALLCONV
+FPDFPageObjMark_CountParams(FPDF_PAGEOBJECTMARK mark) {
+  if (!mark)
+    return -1;
+
+  const CPDF_ContentMarkItem* pMarkItem =
+      CPDFContentMarkItemFromFPDFPageObjectMark(mark);
+
+  const CPDF_Dictionary* pParams = pMarkItem->GetParam();
+  if (!pParams)
+    return 0;
+
+  return pParams->GetCount();
+}
+
 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
 FPDFPageObj_HasTransparency(FPDF_PAGEOBJECT pageObject) {
   if (!pageObject)
diff --git a/fpdfsdk/fpdf_view_c_api_test.c b/fpdfsdk/fpdf_view_c_api_test.c
index 114693c43e..e23efa2ff2 100644
--- a/fpdfsdk/fpdf_view_c_api_test.c
+++ b/fpdfsdk/fpdf_view_c_api_test.c
@@ -148,6 +148,7 @@ int CheckPDFiumCApi() {
     CHK(FPDFPageObj_CountMarks);
     CHK(FPDFPageObj_GetMark);
     CHK(FPDFPageObjMark_GetName);
+    CHK(FPDFPageObjMark_CountParams);
     CHK(FPDFImageObj_LoadJpegFile);
     CHK(FPDFImageObj_LoadJpegFileInline);
     CHK(FPDFImageObj_SetMatrix);
diff --git a/public/fpdf_edit.h b/public/fpdf_edit.h
index 7c37b83aa9..4968a7f003 100644
--- a/public/fpdf_edit.h
+++ b/public/fpdf_edit.h
@@ -315,6 +315,15 @@ FPDFPageObjMark_GetName(FPDF_PAGEOBJECTMARK mark,
                         void* buffer,
                         unsigned long buflen);
 
+// Get number of key/value pair parameters in |mark|.
+//
+//   mark   - handle to a content mark.
+//
+// Returns the number of key/value pair parameters |mark|, or -1 in case of
+// failure.
+FPDF_EXPORT int FPDF_CALLCONV
+FPDFPageObjMark_CountParams(FPDF_PAGEOBJECTMARK mark);
+
 // 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.