1 files changed, 100 insertions, 0 deletions
diff --git a/xfa/fde/cfde_txtedtbufiter.cpp b/xfa/fde/cfde_txtedtbufiter.cpp
new file mode 100644
index 0000000000..c6d77a4523
--- /dev/null
+++ b/xfa/fde/cfde_txtedtbufiter.cpp
@@ -0,0 +1,100 @@
+// 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/fde/cfde_txtedtbufiter.h"
+
+#include "xfa/fde/cfde_txtedtbuf.h"
+
+CFDE_TxtEdtBufIter::CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_WCHAR wcAlias)
+    : m_pBuf(pBuf),
+      m_nCurChunk(0),
+      m_nCurIndex(0),
+      m_nIndex(0),
+      m_Alias(wcAlias) {
+  ASSERT(m_pBuf);
+}
+
+CFDE_TxtEdtBufIter::~CFDE_TxtEdtBufIter() {}
+
+FX_BOOL CFDE_TxtEdtBufIter::Next(FX_BOOL bPrev) {
+  if (bPrev) {
+    if (m_nIndex == 0) {
+      return FALSE;
+    }
+    ASSERT(m_nCurChunk < m_pBuf->m_Chunks.GetSize());
+    CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunk = nullptr;
+    if (m_nCurIndex > 0) {
+      m_nCurIndex--;
+    } else {
+      while (m_nCurChunk > 0) {
+        --m_nCurChunk;
+        lpChunk = m_pBuf->m_Chunks[m_nCurChunk];
+        if (lpChunk->nUsed > 0) {
+          m_nCurIndex = lpChunk->nUsed - 1;
+          break;
+        }
+      }
+    }
+    ASSERT(m_nCurChunk >= 0);
+    m_nIndex--;
+    return TRUE;
+  } else {
+    if (m_nIndex >= (m_pBuf->m_nTotal - 1)) {
+      return FALSE;
+    }
+    ASSERT(m_nCurChunk < m_pBuf->m_Chunks.GetSize());
+    CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunk = m_pBuf->m_Chunks[m_nCurChunk];
+    if (lpChunk->nUsed != (m_nCurIndex + 1)) {
+      m_nCurIndex++;
+    } else {
+      int32_t nEnd = m_pBuf->m_Chunks.GetSize() - 1;
+      while (m_nCurChunk < nEnd) {
+        m_nCurChunk++;
+        CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunkTemp =
+            m_pBuf->m_Chunks[m_nCurChunk];
+        if (lpChunkTemp->nUsed > 0) {
+          m_nCurIndex = 0;
+          break;
+        }
+      }
+    }
+    m_nIndex++;
+    return TRUE;
+  }
+}
+
+void CFDE_TxtEdtBufIter::SetAt(int32_t nIndex) {
+  ASSERT(nIndex >= 0 && nIndex < m_pBuf->m_nTotal);
+  CFDE_TxtEdtBuf::FDE_CHUNKPLACE cp;
+  m_pBuf->Index2CP(nIndex, cp);
+  m_nIndex = nIndex;
+  m_nCurChunk = cp.nChunkIndex;
+  m_nCurIndex = cp.nCharIndex;
+}
+
+int32_t CFDE_TxtEdtBufIter::GetAt() const {
+  return m_nIndex;
+}
+
+FX_WCHAR CFDE_TxtEdtBufIter::GetChar() {
+  ASSERT(m_nIndex >= 0 && m_nIndex < m_pBuf->m_nTotal);
+  if (m_Alias == 0 || m_nIndex == (m_pBuf->m_nTotal - 1))
+    return m_pBuf->m_Chunks[m_nCurChunk]->wChars[m_nCurIndex];
+  return m_Alias;
+}
+
+FX_BOOL CFDE_TxtEdtBufIter::IsEOF(FX_BOOL bTail) const {
+  return bTail ? m_nIndex == (m_pBuf->GetTextLength() - 2) : m_nIndex == 0;
+}
+
+IFX_CharIter* CFDE_TxtEdtBufIter::Clone() {
+  CFDE_TxtEdtBufIter* pIter = new CFDE_TxtEdtBufIter(m_pBuf);
+  pIter->m_nCurChunk = m_nCurChunk;
+  pIter->m_nCurIndex = m_nCurIndex;
+  pIter->m_nIndex = m_nIndex;
+  pIter->m_Alias = m_Alias;
+  return pIter;
+}