1 files changed, 5 insertions, 4 deletions
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.cpp b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
index f8f36aee11..af5ff488db 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
@@ -112,6 +112,10 @@ bool CPDF_SyntaxParser::GetNextChar(uint8_t& ch) {
   return true;
 }
 
+FX_FILESIZE CPDF_SyntaxParser::GetDocumentSize() const {
+  return m_FileLen - m_HeaderOffset;
+}
+
 bool CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t* ch) {
   pos += m_HeaderOffset;
   if (pos >= m_FileLen)
@@ -714,6 +718,7 @@ void CPDF_SyntaxParser::InitParserWithValidator(
   m_pFileBuf.clear();
   m_HeaderOffset = HeaderOffset;
   m_FileLen = validator->GetSize();
+  ASSERT(m_HeaderOffset <= m_FileLen);
   m_Pos = 0;
   m_pFileAccess = validator;
   m_BufOffset = 0;
@@ -813,10 +818,6 @@ FX_FILESIZE CPDF_SyntaxParser::FindTag(const ByteStringView& tag) {
   return -1;
 }
 
-RetainPtr<IFX_SeekableReadStream> CPDF_SyntaxParser::GetFileAccess() const {
-  return m_pFileAccess;
-}
-
 bool CPDF_SyntaxParser::IsPositionRead(FX_FILESIZE pos) const {
   return m_BufOffset <= pos &&
          pos < static_cast<FX_FILESIZE>(m_BufOffset + m_pFileBuf.size());