Fix sign mismatch in CPDFXFA_DocEnvironment.

Fix some other nits as well.

Change-Id: I837bd49526dd97ce666f8d8743fe5bd7653ae544
Reviewed-on: https://pdfium-review.googlesource.com/39410
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp

diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp
index 269b6d4..5e00bff 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.cpp
@@ -471,8 +471,7 @@
     if (!pArray)
       return;
 
-    int size = pArray->GetCount();
-    for (int i = 1; i < size; i += 2) {
+    for (size_t i = 1; i < pArray->GetCount(); i += 2) {
       const CPDF_Object* pPDFObj = pArray->GetObjectAt(i);
       const CPDF_Object* pPrePDFObj = pArray->GetObjectAt(i - 1);
       if (!pPrePDFObj->IsString())
@@ -497,14 +496,14 @@
             fileWrite);
         continue;
       }
-      if (i == size - 1) {
+      if (i == pArray->GetCount() - 1) {
         WideString wPath = WideString::FromUTF16LE(
             reinterpret_cast<const unsigned short*>(bs.c_str()),
             bs.GetLength() / sizeof(unsigned short));
         ByteString bPath = wPath.UTF8Encode();
-        const char* szFormat =
+        static const char kFormat[] =
             "\n<pdf href=\"%s\" xmlns=\"http://ns.adobe.com/xdp/pdf/\"/>";
-        ByteString content = ByteString::Format(szFormat, bPath.c_str());
+        ByteString content = ByteString::Format(kFormat, bPath.c_str());
         fileWrite->WriteBlock(content.c_str(), fileWrite->GetSize(),
                               content.GetLength());
       }
@@ -535,22 +534,19 @@
 bool CPDFXFA_DocEnvironment::IsValidationsEnabled(CXFA_FFDoc* hDoc) {
   if (hDoc != m_pContext->GetXFADoc() || !m_pContext->GetFormFillEnv())
     return false;
-  if (m_pContext->GetFormFillEnv()->GetInterForm()) {
-    return m_pContext->GetFormFillEnv()
-        ->GetInterForm()
-        ->IsXfaValidationsEnabled();
-  }
-  return true;
+
+  auto* interform = m_pContext->GetFormFillEnv()->GetInterForm();
+  return !interform || interform->IsXfaValidationsEnabled();
 }
 
 void CPDFXFA_DocEnvironment::SetValidationsEnabled(CXFA_FFDoc* hDoc,
                                                    bool bEnabled) {
   if (hDoc != m_pContext->GetXFADoc() || !m_pContext->GetFormFillEnv())
     return;
-  if (m_pContext->GetFormFillEnv()->GetInterForm()) {
-    m_pContext->GetFormFillEnv()->GetInterForm()->XfaSetValidationsEnabled(
-        bEnabled);
-  }
+
+  auto* interform = m_pContext->GetFormFillEnv()->GetInterForm();
+  if (interform)
+    interform->XfaSetValidationsEnabled(bEnabled);
 }
 
 void CPDFXFA_DocEnvironment::SetFocusWidget(CXFA_FFDoc* hDoc,
@@ -775,8 +771,7 @@
     return false;
   }
 
-  int size = pArray->GetCount();
-  for (int i = 1; i < size; i += 2) {
+  for (size_t i = 1; i < pArray->GetCount(); i += 2) {
     const CPDF_Object* pPDFObj = pArray->GetObjectAt(i);
     const CPDF_Object* pPrePDFObj = pArray->GetObjectAt(i - 1);
     if (!pPrePDFObj->IsString())

fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h

diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
index 33e04ed..dfc51e0 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_docenvironment.h
@@ -13,7 +13,6 @@
 #include "xfa/fxfa/fxfa.h"
 
 class CPDFXFA_Context;
-class IJS_EventContext;
 
 class CPDFXFA_DocEnvironment : public IXFA_DocEnvironment {
  public: