Split CFDE_CSSTextBuf in two.

For the external buffer use case, use a CFDE_CSSExtTextBuf instead. With
the split, both text buffer implementations are simpler now. As a
result, it becomes obvious where it never fails. Adjust callers
accordingly.

Change-Id: I7b53d36593172487b8c939e6a55af2437ea4ee5a
Reviewed-on: https://pdfium-review.googlesource.com/6932
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/xfa/fde/css/cfde_cssexttextbuf.cpp b/xfa/fde/css/cfde_cssexttextbuf.cpp
new file mode 100644
index 0000000000..86f6776c48
--- /dev/null
+++ b/xfa/fde/css/cfde_cssexttextbuf.cpp
@@ -0,0 +1,17 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "xfa/fde/css/cfde_cssexttextbuf.h"
+
+CFDE_CSSExtTextBuf::CFDE_CSSExtTextBuf()
+    : m_pExtBuffer(nullptr), m_iDatLen(0), m_iDatPos(0) {}
+
+CFDE_CSSExtTextBuf::~CFDE_CSSExtTextBuf() {}
+
+void CFDE_CSSExtTextBuf::AttachBuffer(const wchar_t* pBuffer, int32_t iBufLen) {
+  m_pExtBuffer = pBuffer;
+  m_iDatLen = iBufLen;
+}