Subclass the stream implementations from CFGAS_Stream

Rename CFGAS_TextStream to CFGAS_Stream. CFGAS_Stream is converted
to a base class instead of accepting an IFGAS_StreamImp. Things
which inherted from IFGAS_StreamImp now inherit from CFGAS_Stream.

The stream type inputs are changed to IFX_SeekableStream so that
they can accept the same type (IFX_SeekableStream is an
IFX_SeekableWriteStream and an IFX_SeekableReadStream). This way
the storage can be shared in the base class.

Change-Id: I06645071e68e2a4d4120c0e336529f2c18c2b705
Reviewed-on: https://pdfium-review.googlesource.com/4152
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/xfa/fxfa/cxfa_fileread.h b/xfa/fxfa/cxfa_fileread.h
index 0c3348b8d5..2dba4d23df 100644
--- a/xfa/fxfa/cxfa_fileread.h
+++ b/xfa/fxfa/cxfa_fileread.h
@@ -15,14 +15,19 @@
 class CPDF_Stream;
 class CPDF_StreamAcc;
 
-class CXFA_FileRead : public IFX_SeekableReadStream {
+class CXFA_FileRead : public IFX_SeekableStream {
  public:
   explicit CXFA_FileRead(const std::vector<CPDF_Stream*>& streams);
   ~CXFA_FileRead() override;
 
   // IFX_SeekableReadStream
+  FX_FILESIZE GetPosition() override;
   FX_FILESIZE GetSize() override;
   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  size_t ReadBlock(void* buffer, size_t size) override;
+  bool IsEOF() override;
+  bool Flush() override;
+  bool WriteBlock(const void* pData, FX_FILESIZE offset, size_t size) override;
 
  private:
   std::vector<CFX_RetainPtr<CPDF_StreamAcc>> m_Data;