Store the offset in the archive buffer

This Cl moves the implementation of the archive buffer behind an
IFX_ArchiveStream interface. The buffer holds the current offset and the
offset parameter is removed from the CPDF_Creator and various other
methods.

Change-Id: Ia54e803b58bbfb6ef03fec4a940d2c056d541356
Reviewed-on: https://pdfium-review.googlesource.com/5255
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/core/fpdfapi/parser/cpdf_null.cpp b/core/fpdfapi/parser/cpdf_null.cpp
index b5e07e0c55..254c86fd7a 100644
--- a/core/fpdfapi/parser/cpdf_null.cpp
+++ b/core/fpdfapi/parser/cpdf_null.cpp
@@ -17,10 +17,6 @@ std::unique_ptr<CPDF_Object> CPDF_Null::Clone() const {
   return pdfium::MakeUnique<CPDF_Null>();
 }
 
-bool CPDF_Null::WriteTo(CFX_FileBufferArchive* archive,
-                        FX_FILESIZE* offset) const {
-  if (archive->AppendString(" null") < 0)
-    return false;
-  *offset += 5;
-  return true;
+bool CPDF_Null::WriteTo(IFX_ArchiveStream* archive) const {
+  return archive->WriteString(" null");
 }