1 files changed, 14 insertions, 5 deletions
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.h b/core/fpdfapi/parser/cpdf_syntax_parser.h
index 962c32753d..ebd844c3e0 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.h
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.h
@@ -60,16 +60,24 @@ class CPDF_SyntaxParser {
   ByteString GetNextWord(bool* bIsNumber);
   ByteString PeekNextWord(bool* bIsNumber);
 
-  RetainPtr<IFX_SeekableReadStream> GetFileAccess() const;
-
   const RetainPtr<CPDF_ReadValidator>& GetValidator() const {
     return m_pFileAccess;
   }
   uint32_t GetDirectNum();
   bool GetNextChar(uint8_t& ch);
 
+  // The document size may be smaller than the file size.
+  // The syntax parser use position relative to document
+  // offset (|m_HeaderOffset|).
+  // The document size will be FileSize - "Header offset".
+  // All offsets was readed from document, should not be great than document
+  // size. Use it for checks instead of real file size.
+  FX_FILESIZE GetDocumentSize() const;
+
+  ByteString ReadString();
+  ByteString ReadHexString();
+
  private:
-  friend class CPDF_Parser;
   friend class CPDF_DataAvail;
   friend class cpdf_syntax_parser_ReadHexString_Test;
 
@@ -84,8 +92,6 @@ class CPDF_SyntaxParser {
                    const ByteStringView& tag,
                    bool checkKeyword);
 
-  ByteString ReadString();
-  ByteString ReadHexString();
   unsigned int ReadEOLMarkers(FX_FILESIZE pos);
   FX_FILESIZE FindWordPos(const ByteStringView& word);
   FX_FILESIZE FindStreamEndPos();
@@ -99,6 +105,9 @@ class CPDF_SyntaxParser {
       ParseType parse_type);
 
   FX_FILESIZE m_Pos;
+  // The syntax parser use position relative to header offset.
+  // The header contains at file start, and can follow after some stuff. We
+  // ignore this stuff.
   FX_FILESIZE m_HeaderOffset;
   FX_FILESIZE m_FileLen;
   WeakPtr<ByteStringPool> m_pPool;