Use size_t in CXML_Element and callers.

Change-Id: I9ebacd18252a837f1f5f13ccaec19b196bacc3ae
Reviewed-on: https://pdfium-review.googlesource.com/21072
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

2 files changed, 16 insertions, 18 deletions

diff --git a/core/fxcrt/xml/cxml_element.cpp b/core/fxcrt/xml/cxml_element.cpp
index 9d3e22c8f9..f11fd1fe14 100644
--- a/core/fxcrt/xml/cxml_element.cpp
+++ b/core/fxcrt/xml/cxml_element.cpp
@@ -53,11 +53,11 @@ ByteString CXML_Element::GetNamespaceURI(const ByteString& qName) const {
   return pwsSpace ? pwsSpace->UTF8Encode() : ByteString();
 }
 
-void CXML_Element::GetAttrByIndex(int index,
+void CXML_Element::GetAttrByIndex(size_t index,
                                   ByteString* space,
                                   ByteString* name,
                                   WideString* value) const {
-  if (index < 0 || index >= m_AttrMap.GetSize())
+  if (index >= static_cast<size_t>(m_AttrMap.GetSize()))
     return;
 
   CXML_AttrItem& item = m_AttrMap.GetAt(index);
@@ -89,9 +89,9 @@ int CXML_Element::GetAttrInteger(const ByteStringView& name) const {
   return pwsValue ? pwsValue->GetInteger() : 0;
 }
 
-uint32_t CXML_Element::CountElements(const ByteStringView& space,
-                                     const ByteStringView& tag) const {
-  int count = 0;
+size_t CXML_Element::CountElements(const ByteStringView& space,
+                                   const ByteStringView& tag) const {
+  size_t count = 0;
   for (const auto& pChild : m_Children) {
     const CXML_Element* pKid = pChild->AsElement();
     if (pKid && pKid->m_TagName == tag &&
@@ -102,22 +102,20 @@ uint32_t CXML_Element::CountElements(const ByteStringView& space,
   return count;
 }
 
-CXML_Object* CXML_Element::GetChild(uint32_t index) const {
+CXML_Object* CXML_Element::GetChild(size_t index) const {
   return index < m_Children.size() ? m_Children[index].get() : nullptr;
 }
 
 CXML_Element* CXML_Element::GetElement(const ByteStringView& space,
                                        const ByteStringView& tag,
-                                       int nth) const {
-  if (nth < 0)
-    return nullptr;
-
+                                       size_t nth) const {
   for (const auto& pChild : m_Children) {
     CXML_Element* pKid = pChild->AsElement();
     if (pKid && pKid->m_TagName == tag &&
         (space.IsEmpty() || pKid->m_QSpaceName == space)) {
-      if (nth-- == 0)
+      if (nth == 0)
         return pKid;
+      --nth;
     }
   }
   return nullptr;
diff --git a/core/fxcrt/xml/cxml_element.h b/core/fxcrt/xml/cxml_element.h
index 5c4d24d661..db9a214c17 100644
--- a/core/fxcrt/xml/cxml_element.h
+++ b/core/fxcrt/xml/cxml_element.h
@@ -30,8 +30,8 @@ class CXML_Element : public CXML_Object {
   ByteString GetTagName() const;
   ByteString GetNamespaceURI(const ByteString& qName) const;
   const CXML_Element* GetParent() const { return m_pParent.Get(); }
-  uint32_t CountAttrs() const { return m_AttrMap.GetSize(); }
-  void GetAttrByIndex(int index,
+  size_t CountAttrs() const { return m_AttrMap.GetSize(); }
+  void GetAttrByIndex(size_t index,
                       ByteString* space,
                       ByteString* name,
                       WideString* value) const;
@@ -43,13 +43,13 @@ class CXML_Element : public CXML_Object {
     m_Children.push_back(std::move(child));
   }
 
-  uint32_t CountChildren() const { return m_Children.size(); }
-  uint32_t CountElements(const ByteStringView& space,
-                         const ByteStringView& tag) const;
-  CXML_Object* GetChild(uint32_t index) const;
+  size_t CountChildren() const { return m_Children.size(); }
+  size_t CountElements(const ByteStringView& space,
+                       const ByteStringView& tag) const;
+  CXML_Object* GetChild(size_t index) const;
   CXML_Element* GetElement(const ByteStringView& space,
                            const ByteStringView& tag,
-                           int nth) const;
+                           size_t nth) const;
 
   void SetAttribute(const ByteString& space,
                     const ByteString& name,