Fold CXFA_WideTextRead into IFGAS_Stream

This Cl moves CXFA_WideTextRead to be in the anonymous namespace of
IFGAS_Stream and adds a IFGAS_Stream::CreateWideStringReadStream()
method.

This is done so we have all the implementations of IFGAS_Stream
centralized.

Change-Id: I9fbbf0a493fc2dd05fcd544e344268214a75d8a1
Reviewed-on: https://pdfium-review.googlesource.com/4052
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

3 files changed, 3 insertions, 142 deletions

diff --git a/xfa/fxfa/parser/cxfa_simple_parser.cpp b/xfa/fxfa/parser/cxfa_simple_parser.cpp
index d423bba56d..cce4b68a27 100644
--- a/xfa/fxfa/parser/cxfa_simple_parser.cpp
+++ b/xfa/fxfa/parser/cxfa_simple_parser.cpp
@@ -20,10 +20,10 @@
 #include "xfa/fde/xml/cfde_xmlparser.h"
 #include "xfa/fde/xml/cfde_xmltext.h"
 #include "xfa/fgas/crt/fgas_codepage.h"
+#include "xfa/fgas/crt/ifgas_stream.h"
 #include "xfa/fxfa/fxfa.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_node.h"
-#include "xfa/fxfa/parser/cxfa_widetextread.h"
 #include "xfa/fxfa/parser/xfa_basic_data.h"
 #include "xfa/fxfa/parser/xfa_utils.h"
 
@@ -323,7 +323,8 @@ int32_t CXFA_SimpleParser::ParseXMLData(const CFX_WideString& wsXML,
   CloseParser();
   pXMLNode = nullptr;
   m_pXMLDoc = pdfium::MakeUnique<CFDE_XMLDoc>();
-  auto pStream = pdfium::MakeRetain<CXFA_WideTextRead>(wsXML);
+  CFX_RetainPtr<IFGAS_Stream> pStream =
+      IFGAS_Stream::CreateWideStringReadStream(wsXML);
   auto pParser =
       pdfium::MakeUnique<CFDE_XMLParser>(m_pXMLDoc->GetRoot(), pStream);
   pParser->m_dwCheckStatus = 0x03;
diff --git a/xfa/fxfa/parser/cxfa_widetextread.cpp b/xfa/fxfa/parser/cxfa_widetextread.cpp
deleted file mode 100644
index dc210d1828..0000000000
--- a/xfa/fxfa/parser/cxfa_widetextread.cpp
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2016 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/fxfa/parser/cxfa_widetextread.h"
-
-#include <algorithm>
-
-#include "core/fxcrt/fx_ext.h"
-#include "third_party/base/stl_util.h"
-#include "xfa/fgas/crt/fgas_codepage.h"
-
-CXFA_WideTextRead::CXFA_WideTextRead(const CFX_WideString& wsBuffer)
-    : m_wsBuffer(wsBuffer), m_iPosition(0) {}
-
-CXFA_WideTextRead::~CXFA_WideTextRead() {}
-
-uint32_t CXFA_WideTextRead::GetAccessModes() const {
-  return 0;
-}
-
-int32_t CXFA_WideTextRead::GetLength() const {
-  return m_wsBuffer.GetLength() * sizeof(wchar_t);
-}
-
-int32_t CXFA_WideTextRead::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
-  switch (eSeek) {
-    case FX_STREAMSEEK_Begin:
-      m_iPosition = iOffset;
-      break;
-    case FX_STREAMSEEK_Current:
-      m_iPosition += iOffset;
-      break;
-    case FX_STREAMSEEK_End:
-      m_iPosition = m_wsBuffer.GetLength() + iOffset;
-      break;
-  }
-  m_iPosition = pdfium::clamp(0, m_iPosition, m_wsBuffer.GetLength());
-  return GetPosition();
-}
-
-int32_t CXFA_WideTextRead::GetPosition() {
-  return m_iPosition * sizeof(wchar_t);
-}
-
-bool CXFA_WideTextRead::IsEOF() const {
-  return m_iPosition >= m_wsBuffer.GetLength();
-}
-
-int32_t CXFA_WideTextRead::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
-  return 0;
-}
-
-int32_t CXFA_WideTextRead::ReadString(wchar_t* pStr,
-                                      int32_t iMaxLength,
-                                      bool& bEOS) {
-  iMaxLength = std::min(iMaxLength, m_wsBuffer.GetLength() - m_iPosition);
-  if (iMaxLength == 0)
-    return 0;
-
-  FXSYS_wcsncpy(pStr, m_wsBuffer.c_str() + m_iPosition, iMaxLength);
-  m_iPosition += iMaxLength;
-  bEOS = IsEOF();
-  return iMaxLength;
-}
-
-int32_t CXFA_WideTextRead::WriteData(const uint8_t* pBuffer,
-                                     int32_t iBufferSize) {
-  return 0;
-}
-
-int32_t CXFA_WideTextRead::WriteString(const wchar_t* pStr, int32_t iLength) {
-  return 0;
-}
-
-bool CXFA_WideTextRead::SetLength(int32_t iLength) {
-  return false;
-}
-
-int32_t CXFA_WideTextRead::GetBOM(uint8_t bom[4]) const {
-  return 0;
-}
-
-uint16_t CXFA_WideTextRead::GetCodePage() const {
-  return (sizeof(wchar_t) == 2) ? FX_CODEPAGE_UTF16LE : FX_CODEPAGE_UTF32LE;
-}
-
-uint16_t CXFA_WideTextRead::SetCodePage(uint16_t wCodePage) {
-  return GetCodePage();
-}
-
-CFX_WideString CXFA_WideTextRead::GetSrcText() const {
-  return m_wsBuffer;
-}
diff --git a/xfa/fxfa/parser/cxfa_widetextread.h b/xfa/fxfa/parser/cxfa_widetextread.h
deleted file mode 100644
index 648e14ed0d..0000000000
--- a/xfa/fxfa/parser/cxfa_widetextread.h
+++ /dev/null
@@ -1,44 +0,0 @@
-// Copyright 2016 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
-
-#ifndef XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_
-#define XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_
-
-#include "core/fxcrt/cfx_retain_ptr.h"
-#include "xfa/fgas/crt/ifgas_stream.h"
-
-class CXFA_WideTextRead : public IFGAS_Stream {
- public:
-  template <typename T, typename... Args>
-  friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
-
-  // IFGAS_Stream
-  uint32_t GetAccessModes() const override;
-  int32_t GetLength() const override;
-  int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
-  int32_t GetPosition() override;
-  bool IsEOF() const override;
-  int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
-  int32_t ReadString(wchar_t* pStr, int32_t iMaxLength, bool& bEOS) override;
-  int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
-  int32_t WriteString(const wchar_t* pStr, int32_t iLength) override;
-  void Flush() override {}
-  bool SetLength(int32_t iLength) override;
-  int32_t GetBOM(uint8_t bom[4]) const override;
-  uint16_t GetCodePage() const override;
-  uint16_t SetCodePage(uint16_t wCodePage) override;
-
-  CFX_WideString GetSrcText() const;
-
- private:
-  explicit CXFA_WideTextRead(const CFX_WideString& wsBuffer);
-  ~CXFA_WideTextRead() override;
-
-  CFX_WideString m_wsBuffer;
-  int32_t m_iPosition;
-};
-
-#endif  // XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_