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, 3 insertions, 9 deletions

diff --git a/core/fpdfapi/parser/cpdf_string.cpp b/core/fpdfapi/parser/cpdf_string.cpp
index 01cf3ff1b0..74a2733fc5 100644
--- a/core/fpdfapi/parser/cpdf_string.cpp
+++ b/core/fpdfapi/parser/cpdf_string.cpp
@@ -65,13 +65,7 @@ CFX_WideString CPDF_String::GetUnicodeText() const {
   return PDF_DecodeText(m_String);
 }
 
-bool CPDF_String::WriteTo(CFX_FileBufferArchive* archive,
-                          FX_FILESIZE* offset) const {
-  CFX_ByteString str = GetString();
-  int32_t len =
-      archive->AppendString(PDF_EncodeString(str, IsHex()).AsStringC());
-  if (len < 0)
-    return false;
-  *offset += len;
-  return true;
+bool CPDF_String::WriteTo(IFX_ArchiveStream* archive) const {
+  return archive->WriteString(
+      PDF_EncodeString(GetString(), IsHex()).AsStringC());
 }