Create API to remove a parameter from a content mark.chromium/3491

- FPDFPageObjMark_RemoveParam()

Bug: pdfium:1037
Change-Id: I3ec25128795c36ba7f2f72a9d288a7855ecc3180
Reviewed-on: https://pdfium-review.googlesource.com/37770
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 22 insertions, 2 deletions

diff --git a/fpdfsdk/fpdf_editpage.cpp b/fpdfsdk/fpdf_editpage.cpp
index 808e330225..5a7312d9f3 100644
--- a/fpdfsdk/fpdf_editpage.cpp
+++ b/fpdfsdk/fpdf_editpage.cpp
@@ -99,11 +99,11 @@ void CalcBoundingBox(CPDF_PageObject* pPageObj) {
   }
 }
 
-const CPDF_Dictionary* GetMarkParamDict(FPDF_PAGEOBJECTMARK mark) {
+CPDF_Dictionary* GetMarkParamDict(FPDF_PAGEOBJECTMARK mark) {
   if (!mark)
     return nullptr;
 
-  const CPDF_ContentMarkItem* pMarkItem =
+  CPDF_ContentMarkItem* pMarkItem =
       CPDFContentMarkItemFromFPDFPageObjectMark(mark);
 
   return pMarkItem->GetParam();
@@ -566,6 +566,26 @@ FPDFPageObjMark_SetBlobParam(FPDF_DOCUMENT document,
   return true;
 }
 
+FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
+FPDFPageObjMark_RemoveParam(FPDF_PAGEOBJECT page_object,
+                            FPDF_PAGEOBJECTMARK mark,
+                            FPDF_BYTESTRING key) {
+  CPDF_PageObject* pPageObj = CPDFPageObjectFromFPDFPageObject(page_object);
+  if (!pPageObj)
+    return false;
+
+  CPDF_Dictionary* pParams = GetMarkParamDict(mark);
+  if (!pParams)
+    return false;
+
+  auto removed = pParams->RemoveFor(key);
+  if (!removed)
+    return false;
+
+  pPageObj->SetDirty(true);
+  return true;
+}
+
 FPDF_EXPORT int FPDF_CALLCONV FPDFPageObj_GetType(FPDF_PAGEOBJECT pageObject) {
   if (!pageObject)
     return FPDF_PAGEOBJ_UNKNOWN;