Move xfa_basic_imp to cxfa_widetextread.

xfa/fxfa/parser/cxfa_widetextread.cpp

Index: xfa/fxfa/parser/cxfa_widetextread.cpp
diff --git a/xfa/fxfa/parser/cxfa_widetextread.cpp b/xfa/fxfa/parser/cxfa_widetextread.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..90abe9af53d84dd3966cb2b2bbdd8e147183a105
--- /dev/null
+++ b/xfa/fxfa/parser/cxfa_widetextread.cpp
@@ -0,0 +1,107 @@
+// 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 "core/fxcrt/include/fx_ext.h"
+#include "xfa/fgas/crt/fgas_codepage.h"
+
+CXFA_WideTextRead::CXFA_WideTextRead(const CFX_WideString& wsBuffer)
+    : m_wsBuffer(wsBuffer), m_iPosition(0), m_iRefCount(1) {}
+
+void CXFA_WideTextRead::Release() {
+  if (--m_iRefCount < 1)
+    delete this;
+}
+
+IFX_Stream* CXFA_WideTextRead::Retain() {
+  m_iRefCount++;
+  return this;
+}
+
+uint32_t CXFA_WideTextRead::GetAccessModes() const {
+  return FX_STREAMACCESS_Read | FX_STREAMACCESS_Text;
+}
+
+int32_t CXFA_WideTextRead::GetLength() const {
+  return m_wsBuffer.GetLength() * sizeof(FX_WCHAR);
+}
+
+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 = std::min(std::max(0, m_iPosition), m_wsBuffer.GetLength());
+  return GetPosition();
+}
+
+int32_t CXFA_WideTextRead::GetPosition() {
+  return m_iPosition * sizeof(FX_WCHAR);
+}
+
+FX_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(FX_WCHAR* pStr,
+                                      int32_t iMaxLength,
+                                      FX_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 FX_WCHAR* pStr, int32_t iLength) {
+  return 0;
+}
+
+FX_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(FX_WCHAR) == 2) ? FX_CODEPAGE_UTF16LE : FX_CODEPAGE_UTF32LE;
+}
+
+uint16_t CXFA_WideTextRead::SetCodePage(uint16_t wCodePage) {
+  return GetCodePage();
+}
+
+IFX_Stream* CXFA_WideTextRead::CreateSharedStream(uint32_t dwAccess,
+                                                  int32_t iOffset,
+                                                  int32_t iLength) {
+  return nullptr;
+}
+
+CFX_WideString CXFA_WideTextRead::GetSrcText() const {
+  return m_wsBuffer;
+}