Make ContentParam::m_Name be a ByteString.

Currently this is an inline fixed-length char[] buffer.  We make a byte
string out of this in many places, and the current implementation still
memcpy's, so the additional costs should be minimal.

Next, we can avoid special-casing names that are longer than the
fixed size.

Change-Id: I980463cbb2325a9d6080bb51a6dfb0dbd1b704b1
Reviewed-on: https://pdfium-review.googlesource.com/42430
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

2 files changed, 15 insertions, 31 deletions

diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 20892cc264..0760e150f3 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -318,21 +318,9 @@ int CPDF_StreamContentParser::GetNextParamPos() {
 
 void CPDF_StreamContentParser::AddNameParam(const ByteStringView& bsName) {
   ContentParam& param = m_ParamBuf[GetNextParamPos()];
-  if (bsName.GetLength() > 32) {
-    param.m_Type = ContentParam::OBJECT;
-    param.m_pObject = pdfium::MakeUnique<CPDF_Name>(
-        m_pDocument->GetByteStringPool(), PDF_NameDecode(bsName));
-  } else {
-    param.m_Type = ContentParam::NAME;
-    if (bsName.Contains('#')) {
-      ByteString str = PDF_NameDecode(bsName);
-      memcpy(param.m_Name.m_Buffer, str.c_str(), str.GetLength());
-      param.m_Name.m_Len = str.GetLength();
-    } else {
-      memcpy(param.m_Name.m_Buffer, bsName.raw_str(), bsName.GetLength());
-      param.m_Name.m_Len = bsName.GetLength();
-    }
-  }
+  param.m_Type = ContentParam::NAME;
+  param.m_Name =
+      bsName.Contains('#') ? PDF_NameDecode(bsName) : ByteString(bsName);
 }
 
 void CPDF_StreamContentParser::AddNumberParam(const ByteStringView& str) {
@@ -381,8 +369,7 @@ CPDF_Object* CPDF_StreamContentParser::GetObject(uint32_t index) {
   if (param.m_Type == ContentParam::NAME) {
     param.m_Type = ContentParam::OBJECT;
     param.m_pObject = pdfium::MakeUnique<CPDF_Name>(
-        m_pDocument->GetByteStringPool(),
-        ByteString(param.m_Name.m_Buffer, param.m_Name.m_Len));
+        m_pDocument->GetByteStringPool(), param.m_Name);
     return param.m_pObject.get();
   }
   if (param.m_Type == ContentParam::OBJECT)
@@ -393,20 +380,20 @@ CPDF_Object* CPDF_StreamContentParser::GetObject(uint32_t index) {
 }
 
 ByteString CPDF_StreamContentParser::GetString(uint32_t index) const {
-  if (index >= m_ParamCount) {
+  if (index >= m_ParamCount)
     return ByteString();
-  }
+
   int real_index = m_ParamStartPos + m_ParamCount - index - 1;
-  if (real_index >= kParamBufSize) {
+  if (real_index >= kParamBufSize)
     real_index -= kParamBufSize;
-  }
+
   const ContentParam& param = m_ParamBuf[real_index];
-  if (param.m_Type == ContentParam::NAME) {
-    return ByteString(param.m_Name.m_Buffer, param.m_Name.m_Len);
-  }
-  if (param.m_Type == 0 && param.m_pObject) {
+  if (param.m_Type == ContentParam::NAME)
+    return param.m_Name;
+
+  if (param.m_Type == 0 && param.m_pObject)
     return param.m_pObject->GetString();
-  }
+
   return ByteString();
 }
 
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.h b/core/fpdfapi/page/cpdf_streamcontentparser.h
index 6417043305..d9239fd6fa 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.h
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.h
@@ -71,12 +71,9 @@ class CPDF_StreamContentParser {
     ~ContentParam();
 
     Type m_Type;
-    std::unique_ptr<CPDF_Object> m_pObject;
     FX_Number m_Number;
-    struct {
-      int m_Len;
-      char m_Buffer[32];
-    } m_Name;
+    ByteString m_Name;
+    std::unique_ptr<CPDF_Object> m_pObject;
   };
 
   static const int kParamBufSize = 16;