in the attempt to fix 627393, changed IFX_FileRead's readBlock to return the length it reads

core/fpdfapi/parser/cpdf_syntax_parser.cpp

Index: core/fpdfapi/parser/cpdf_syntax_parser.cpp
diff --git a/core/fpdfapi/parser/cpdf_syntax_parser.cpp b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
index 842ef2b22201143cbda709303041412adf3c8a30..3e11b852389c182a91d55169c14f85feb4ea1d60 100644
--- a/core/fpdfapi/parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_syntax_parser.cpp
@@ -64,7 +64,8 @@ bool CPDF_SyntaxParser::ReadChar(FX_FILESIZE read_pos, uint32_t read_size) {
       read_pos = m_FileLen - read_size;
     }
   }
-  if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size))
+  if (m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size) != read_size &&
+      !m_pFileAccess->IsEOF())
     return false;
 
   m_BufOffset = read_pos;
@@ -108,7 +109,8 @@ bool CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch) {
 }
 
 bool CPDF_SyntaxParser::ReadBlock(uint8_t* pBuf, uint32_t size) {
-  if (!m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size))
+  if (m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size) != size &&
+      !m_pFileAccess->IsEOF())
     return false;
   m_Pos += size;

[Tom Sepez, 2016/11/14 20:27:40]

and here.

   return true;