Simplify CPDF_Array::RemoveAt(index, size).

Instead of one general RemoveAt() method, split it into:
- RemoveAt(index)
- Truncate(nNewSize)
- Clear()

Update callers, which are now easier to understand.

Update existing unit tests and add new tests.

Change-Id: I38fe40146ce8f2479677b2caadd20a1756678768
Reviewed-on: https://pdfium-review.googlesource.com/6417
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>

2 files changed, 7 insertions, 6 deletions

diff --git a/fpdfsdk/fpdfannot.cpp b/fpdfsdk/fpdfannot.cpp
index 941a5fdd80..0c2152a7aa 100644
--- a/fpdfsdk/fpdfannot.cpp
+++ b/fpdfsdk/fpdfannot.cpp
@@ -184,7 +184,7 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFAnnot_SetColor(FPDF_ANNOTATION annot,
   CFX_ByteString key = type == FPDFANNOT_COLORTYPE_InteriorColor ? "IC" : "C";
   CPDF_Array* pColor = pAnnotDict->GetArrayFor(key);
   if (pColor)
-    pColor->RemoveAt(0, pColor->GetCount());
+    pColor->Clear();
   else
     pColor = pAnnotDict->SetNewFor<CPDF_Array>(key);
 
@@ -270,7 +270,7 @@ FPDFAnnot_SetAttachmentPoints(FPDF_ANNOTATION annot,
   CPDF_Dictionary* pAnnotDict = CPDFDictionaryFromFPDFAnnotation(annot);
   CPDF_Array* pQuadPoints = pAnnotDict->GetArrayFor("QuadPoints");
   if (pQuadPoints)
-    pQuadPoints->RemoveAt(0, pQuadPoints->GetCount());
+    pQuadPoints->Clear();
   else
     pQuadPoints = pAnnotDict->SetNewFor<CPDF_Array>("QuadPoints");
 
@@ -315,7 +315,7 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFAnnot_SetRect(FPDF_ANNOTATION annot,
 
   CPDF_Array* pRect = pAnnotDict->GetArrayFor("Rect");
   if (pRect)
-    pRect->RemoveAt(0, pRect->GetCount());
+    pRect->Clear();
   else
     pRect = pAnnotDict->SetNewFor<CPDF_Array>("Rect");
 
diff --git a/fpdfsdk/fpdfeditpage.cpp b/fpdfsdk/fpdfeditpage.cpp
index 22b2261c6f..699e030c49 100644
--- a/fpdfsdk/fpdfeditpage.cpp
+++ b/fpdfsdk/fpdfeditpage.cpp
@@ -297,11 +297,12 @@ DLLEXPORT void STDCALL FPDFPage_TransformAnnots(FPDF_PAGE page,
                       (float)f);
     matrix.TransformRect(rect);
 
-    CPDF_Array* pRectArray = pAnnot->GetAnnotDict()->GetArrayFor("Rect");
+    CPDF_Dictionary* pAnnotDict = pAnnot->GetAnnotDict();
+    CPDF_Array* pRectArray = pAnnotDict->GetArrayFor("Rect");
     if (pRectArray)
-      pRectArray->RemoveAt(0, pRectArray->GetCount());
+      pRectArray->Clear();
     else
-      pRectArray = pAnnot->GetAnnotDict()->SetNewFor<CPDF_Array>("Rect");
+      pRectArray = pAnnotDict->SetNewFor<CPDF_Array>("Rect");
 
     pRectArray->AddNew<CPDF_Number>(rect.left);
     pRectArray->AddNew<CPDF_Number>(rect.bottom);