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, 25 insertions, 0 deletions

diff --git a/xfa/fxfa/cxfa_fileread.cpp b/xfa/fxfa/cxfa_fileread.cpp
index e2ecad2e93..acd81a2232 100644
--- a/xfa/fxfa/cxfa_fileread.cpp
+++ b/xfa/fxfa/cxfa_fileread.cpp
@@ -54,3 +54,28 @@ bool CXFA_FileRead::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) {
   }
   return false;
 }
+
+size_t CXFA_FileRead::ReadBlock(void* buffer, size_t size) {
+  ASSERT(false);
+  return 0;
+}
+
+FX_FILESIZE CXFA_FileRead::GetPosition() {
+  return 0;
+}
+
+bool CXFA_FileRead::IsEOF() {
+  return false;
+}
+
+bool CXFA_FileRead::Flush() {
+  ASSERT(false);
+  return false;
+}
+
+bool CXFA_FileRead::WriteBlock(const void* pData,
+                               FX_FILESIZE offset,
+                               size_t size) {
+  ASSERT(false);
+  return false;
+}