Create API to get PageObject mark parameters.

New calls added in this cl:
- FPDFPageObjMark_GetParamKey
- FPDFPageObjMark_GetParamValueType
- FPDFPageObjMark_GetParamIntValue

Bug: pdfium:1037
Change-Id: Iedb74ddbf8a5483de62094ec295dadd6367d5175
Reviewed-on: https://pdfium-review.googlesource.com/30912
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>

3 files changed, 66 insertions, 0 deletions

diff --git a/fpdfsdk/fpdf_edit_embeddertest.cpp b/fpdfsdk/fpdf_edit_embeddertest.cpp
index 8f54bf8eab..ec6b893530 100644
--- a/fpdfsdk/fpdf_edit_embeddertest.cpp
+++ b/fpdfsdk/fpdf_edit_embeddertest.cpp
@@ -473,6 +473,14 @@ TEST_F(FPDFEditEmbeddertest, RemoveMarkedObjectsPrime) {
       } else if (name == L"Square") {
         square_count++;
         EXPECT_EQ(1, FPDFPageObjMark_CountParams(mark));
+        ASSERT_GT(FPDFPageObjMark_GetParamKey(mark, 0, buffer, 256), 0u);
+        std::wstring key =
+            GetPlatformWString(reinterpret_cast<unsigned short*>(buffer));
+        EXPECT_EQ(L"Factor", key);
+        EXPECT_EQ(FPDF_OBJECT_NUMBER,
+                  FPDFPageObjMark_GetParamValueType(mark, 0));
+        int square_root = FPDFPageObjMark_GetParamIntValue(mark, 0);
+        EXPECT_EQ(i + 1, square_root * square_root);
       } else if (name == L"GreaterThanTen") {
         greater_than_ten_count++;
         EXPECT_EQ(0, FPDFPageObjMark_CountParams(mark));
diff --git a/fpdfsdk/fpdf_editpage.cpp b/fpdfsdk/fpdf_editpage.cpp
index 7a8bbabf2d..241025f3a6 100644
--- a/fpdfsdk/fpdf_editpage.cpp
+++ b/fpdfsdk/fpdf_editpage.cpp
@@ -99,6 +99,28 @@ void CalcBoundingBox(CPDF_PageObject* pPageObj) {
   }
 }
 
+const std::pair<const ByteString, std::unique_ptr<CPDF_Object>>*
+GetMarkParamPairAtIndex(FPDF_PAGEOBJECTMARK mark, unsigned long index) {
+  if (!mark)
+    return nullptr;
+
+  const CPDF_ContentMarkItem* pMarkItem =
+      CPDFContentMarkItemFromFPDFPageObjectMark(mark);
+
+  const CPDF_Dictionary* pParams = pMarkItem->GetParam();
+  if (!pParams)
+    return nullptr;
+
+  for (auto& it : *pParams) {
+    if (index == 0)
+      return &it;
+
+    --index;
+  }
+
+  return nullptr;
+}
+
 }  // namespace
 
 FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV FPDF_CreateNewDocument() {
@@ -284,6 +306,39 @@ FPDFPageObjMark_CountParams(FPDF_PAGEOBJECTMARK mark) {
   return pParams->GetCount();
 }
 
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDFPageObjMark_GetParamKey(FPDF_PAGEOBJECTMARK mark,
+                            unsigned long index,
+                            void* buffer,
+                            unsigned long buflen) {
+  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
+  if (!param_pair)
+    return 0;
+
+  return Utf16EncodeMaybeCopyAndReturnLength(
+      WideString::FromUTF8(param_pair->first.AsStringView()), buffer, buflen);
+}
+
+FPDF_EXPORT FPDF_OBJECT_TYPE FPDF_CALLCONV
+FPDFPageObjMark_GetParamValueType(FPDF_PAGEOBJECTMARK mark,
+                                  unsigned long index) {
+  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
+  if (!param_pair)
+    return FPDF_OBJECT_UNKNOWN;
+
+  return param_pair->second->GetType();
+}
+
+FPDF_EXPORT int FPDF_CALLCONV
+FPDFPageObjMark_GetParamIntValue(FPDF_PAGEOBJECTMARK mark,
+                                 unsigned long index) {
+  auto* param_pair = GetMarkParamPairAtIndex(mark, index);
+  if (!param_pair)
+    return 0;
+
+  return param_pair->second->GetInteger();
+}
+
 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 017487246b..dd93095550 100644
--- a/fpdfsdk/fpdf_view_c_api_test.c
+++ b/fpdfsdk/fpdf_view_c_api_test.c
@@ -149,6 +149,9 @@ int CheckPDFiumCApi() {
     CHK(FPDFPageObj_GetMark);
     CHK(FPDFPageObjMark_GetName);
     CHK(FPDFPageObjMark_CountParams);
+    CHK(FPDFPageObjMark_GetParamKey);
+    CHK(FPDFPageObjMark_GetParamValueType);
+    CHK(FPDFPageObjMark_GetParamIntValue);
     CHK(FPDFImageObj_LoadJpegFile);
     CHK(FPDFImageObj_LoadJpegFileInline);
     CHK(FPDFImageObj_SetMatrix);