xref: /external/pdfium/xfa/src/fxfa/src/parser/xfa_basic_imp.cpp

// Copyright 2014 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/src/foxitlib.h"
#include "xfa/src/fxfa/src/common/xfa_utils.h"
#include "xfa/src/fxfa/src/common/xfa_object.h"
#include "xfa/src/fxfa/src/common/xfa_document.h"
#include "xfa/src/fxfa/src/common/xfa_parser.h"
#include "xfa/src/fxfa/src/common/xfa_script.h"
#include "xfa/src/fxfa/src/common/xfa_docdata.h"
#include "xfa/src/fxfa/src/common/xfa_doclayout.h"
#include "xfa/src/fxfa/src/common/xfa_localemgr.h"
#include "xfa/src/fxfa/src/common/xfa_fm2jsapi.h"
#include "xfa_basic_imp.h"
extern const XFA_PACKETINFO g_XFAPacketData[];
extern const int32_t g_iXFAPacketCount;
extern const XFA_ATTRIBUTEENUMINFO g_XFAEnumData[];
extern const int32_t g_iXFAEnumCount;
extern const XFA_ATTRIBUTEINFO g_XFAAttributeData[];
extern const int32_t g_iXFAAttributeCount;
extern const XFA_ELEMENTINFO g_XFAElementData[];
extern const int32_t g_iXFAElementCount;
extern const XFA_ELEMENTHIERARCHY g_XFAElementChildrenIndex[];
extern const FX_WORD g_XFAElementChildrenData[];
extern const XFA_ELEMENTHIERARCHY g_XFAElementAttributeIndex[];
extern const uint8_t g_XFAElementAttributeData[];
extern const XFA_NOTSUREATTRIBUTE g_XFANotsureAttributes[];
extern const int32_t g_iXFANotsureCount;
extern const XFA_ELEMENTHIERARCHY g_XFAElementPropertyIndex[];
extern const XFA_PROPERTY g_XFAElementPropertyData[];
extern const XFA_SCRIPTHIERARCHY g_XFAScriptIndex[];
extern const XFA_METHODINFO g_SomMethodData[];
extern const int32_t g_iSomMethodCount;
extern const XFA_SCRIPTATTRIBUTEINFO g_SomAttributeData[];
extern const int32_t g_iSomAttributeCount;
XFA_LPCPACKETINFO XFA_GetPacketByName(const CFX_WideStringC& wsName) {
  int32_t iLength = wsName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  uint32_t uHash = FX_HashCode_String_GetW(wsName.GetPtr(), iLength);
  int32_t iStart = 0, iEnd = g_iXFAPacketCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    XFA_LPCPACKETINFO pInfo = g_XFAPacketData + iMid;
    if (uHash == pInfo->uHash) {
      return pInfo;
    } else if (uHash < pInfo->uHash) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
XFA_LPCPACKETINFO XFA_GetPacketByID(FX_DWORD dwPacket) {
  int32_t iStart = 0, iEnd = g_iXFAPacketCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    FX_DWORD dwFind = (g_XFAPacketData + iMid)->eName;
    if (dwPacket == dwFind) {
      return g_XFAPacketData + iMid;
    } else if (dwPacket < dwFind) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
XFA_LPCATTRIBUTEENUMINFO XFA_GetAttributeEnumByName(
    const CFX_WideStringC& wsName) {
  int32_t iLength = wsName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  uint32_t uHash = FX_HashCode_String_GetW(wsName.GetPtr(), iLength);
  int32_t iStart = 0, iEnd = g_iXFAEnumCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    XFA_LPCATTRIBUTEENUMINFO pInfo = g_XFAEnumData + iMid;
    if (uHash == pInfo->uHash) {
      return pInfo;
    } else if (uHash < pInfo->uHash) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
XFA_LPCATTRIBUTEENUMINFO XFA_GetAttributeEnumByID(XFA_ATTRIBUTEENUM eName) {
  return g_XFAEnumData + eName;
}
int32_t XFA_GetAttributeCount() {
  return g_iXFAAttributeCount;
}
XFA_LPCATTRIBUTEINFO XFA_GetAttributeByName(const CFX_WideStringC& wsName) {
  int32_t iLength = wsName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  uint32_t uHash = FX_HashCode_String_GetW(wsName.GetPtr(), iLength);
  int32_t iStart = 0, iEnd = g_iXFAAttributeCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    XFA_LPCATTRIBUTEINFO pInfo = g_XFAAttributeData + iMid;
    if (uHash == pInfo->uHash) {
      return pInfo;
    } else if (uHash < pInfo->uHash) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
XFA_LPCATTRIBUTEINFO XFA_GetAttributeByID(XFA_ATTRIBUTE eName) {
  return (eName < g_iXFAAttributeCount) ? (g_XFAAttributeData + eName) : NULL;
}
FX_BOOL XFA_GetAttributeDefaultValue(void*& pValue,
                                     XFA_ELEMENT eElement,
                                     XFA_ATTRIBUTE eAttribute,
                                     XFA_ATTRIBUTETYPE eType,
                                     FX_DWORD dwPacket) {
  XFA_LPCATTRIBUTEINFO pInfo = XFA_GetAttributeByID(eAttribute);
  if (pInfo == NULL) {
    return FALSE;
  }
  if (dwPacket && (dwPacket & pInfo->dwPackets) == 0) {
    return FALSE;
  }
  if (pInfo->eType == eType) {
    pValue = pInfo->pDefValue;
    return TRUE;
  } else if (pInfo->eType == XFA_ATTRIBUTETYPE_NOTSURE) {
    XFA_LPCNOTSUREATTRIBUTE pAttr =
        XFA_GetNotsureAttribute(eElement, eAttribute, eType);
    if (pAttr) {
      pValue = pAttr->pValue;
      return TRUE;
    }
  }
  return FALSE;
}
XFA_ATTRIBUTEENUM XFA_GetAttributeDefaultValue_Enum(XFA_ELEMENT eElement,
                                                    XFA_ATTRIBUTE eAttribute,
                                                    FX_DWORD dwPacket) {
  void* pValue;
  if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                   XFA_ATTRIBUTETYPE_Enum, dwPacket)) {
    return (XFA_ATTRIBUTEENUM)(uintptr_t)pValue;
  }
  return XFA_ATTRIBUTEENUM_Unknown;
}
CFX_WideStringC XFA_GetAttributeDefaultValue_Cdata(XFA_ELEMENT eElement,
                                                   XFA_ATTRIBUTE eAttribute,
                                                   FX_DWORD dwPacket) {
  void* pValue;
  if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                   XFA_ATTRIBUTETYPE_Cdata, dwPacket)) {
    return (const FX_WCHAR*)pValue;
  }
  return NULL;
}
FX_BOOL XFA_GetAttributeDefaultValue_Boolean(XFA_ELEMENT eElement,
                                             XFA_ATTRIBUTE eAttribute,
                                             FX_DWORD dwPacket) {
  void* pValue;
  if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                   XFA_ATTRIBUTETYPE_Boolean, dwPacket)) {
    return (FX_BOOL)(uintptr_t)pValue;
  }
  return FALSE;
}
int32_t XFA_GetAttributeDefaultValue_Integer(XFA_ELEMENT eElement,
                                             XFA_ATTRIBUTE eAttribute,
                                             FX_DWORD dwPacket) {
  void* pValue;
  if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                   XFA_ATTRIBUTETYPE_Integer, dwPacket)) {
    return (int32_t)(uintptr_t)pValue;
  }
  return 0;
}
CXFA_Measurement XFA_GetAttributeDefaultValue_Measure(XFA_ELEMENT eElement,
                                                      XFA_ATTRIBUTE eAttribute,
                                                      FX_DWORD dwPacket) {
  void* pValue;
  if (XFA_GetAttributeDefaultValue(pValue, eElement, eAttribute,
                                   XFA_ATTRIBUTETYPE_Measure, dwPacket)) {
    return *(CXFA_Measurement*)pValue;
  }
  return CXFA_Measurement();
}
int32_t XFA_GetElementCount() {
  return g_iXFAElementCount;
}
XFA_LPCELEMENTINFO XFA_GetElementByName(const CFX_WideStringC& wsName) {
  int32_t iLength = wsName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  uint32_t uHash = FX_HashCode_String_GetW(wsName.GetPtr(), iLength);
  int32_t iStart = 0, iEnd = g_iXFAElementCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    XFA_LPCELEMENTINFO pInfo = g_XFAElementData + iMid;
    if (uHash == pInfo->uHash) {
      return pInfo;
    } else if (uHash < pInfo->uHash) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
XFA_LPCELEMENTINFO XFA_GetElementByID(XFA_ELEMENT eName) {
  return (eName < g_iXFAElementCount) ? (g_XFAElementData + eName) : NULL;
}
const FX_WORD* XFA_GetElementChildren(XFA_ELEMENT eElement, int32_t& iCount) {
  if (eElement >= g_iXFAElementCount) {
    return NULL;
  }
  XFA_LPCELEMENTHIERARCHY pElement = g_XFAElementChildrenIndex + eElement;
  iCount = pElement->wCount;
  return g_XFAElementChildrenData + pElement->wStart;
}
const uint8_t* XFA_GetElementAttributes(XFA_ELEMENT eElement, int32_t& iCount) {
  if (eElement >= g_iXFAElementCount) {
    return NULL;
  }
  XFA_LPCELEMENTHIERARCHY pElement = g_XFAElementAttributeIndex + eElement;
  iCount = pElement->wCount;
  return g_XFAElementAttributeData + pElement->wStart;
}
XFA_LPCATTRIBUTEINFO XFA_GetAttributeOfElement(XFA_ELEMENT eElement,
                                               XFA_ATTRIBUTE eAttribute,
                                               FX_DWORD dwPacket) {
  int32_t iCount = 0;
  const uint8_t* pAttr = XFA_GetElementAttributes(eElement, iCount);
  if (pAttr == NULL || iCount < 1) {
    return NULL;
  }
  CFX_DSPATemplate<uint8_t> search;
  int32_t index = search.Lookup(eAttribute, pAttr, iCount);
  if (index < 0) {
    return NULL;
  }
  XFA_LPCATTRIBUTEINFO pInfo = XFA_GetAttributeByID(eAttribute);
  ASSERT(pInfo != NULL);
  if (dwPacket == XFA_XDPPACKET_UNKNOWN) {
    return pInfo;
  }
  return (dwPacket & pInfo->dwPackets) ? pInfo : NULL;
}
XFA_LPCELEMENTINFO XFA_GetChildOfElement(XFA_ELEMENT eElement,
                                         XFA_ELEMENT eChild,
                                         FX_DWORD dwPacket) {
  int32_t iCount = 0;
  const FX_WORD* pChild = XFA_GetElementChildren(eElement, iCount);
  if (pChild == NULL || iCount < 1) {
    return NULL;
  }
  CFX_DSPATemplate<FX_WORD> search;
  int32_t index = search.Lookup(eChild, pChild, iCount);
  if (index < 0) {
    return NULL;
  }
  XFA_LPCELEMENTINFO pInfo = XFA_GetElementByID(eChild);
  ASSERT(pInfo != NULL);
  if (dwPacket == XFA_XDPPACKET_UNKNOWN) {
    return pInfo;
  }
  return (dwPacket & pInfo->dwPackets) ? pInfo : NULL;
}
XFA_LPCPROPERTY XFA_GetElementProperties(XFA_ELEMENT eElement,
                                         int32_t& iCount) {
  if (eElement >= g_iXFAElementCount) {
    return NULL;
  }
  XFA_LPCELEMENTHIERARCHY pElement = g_XFAElementPropertyIndex + eElement;
  iCount = pElement->wCount;
  return g_XFAElementPropertyData + pElement->wStart;
}
XFA_LPCPROPERTY XFA_GetPropertyOfElement(XFA_ELEMENT eElement,
                                         XFA_ELEMENT eProperty,
                                         FX_DWORD dwPacket) {
  int32_t iCount = 0;
  XFA_LPCPROPERTY pProperty = XFA_GetElementProperties(eElement, iCount);
  if (pProperty == NULL || iCount < 1) {
    return NULL;
  }
  int32_t iStart = 0, iEnd = iCount - 1, iMid;
  do {
    iMid = (iStart + iEnd) / 2;
    XFA_ELEMENT eName = (XFA_ELEMENT)pProperty[iMid].eName;
    if (eProperty == eName) {
      break;
    } else if (eProperty < eName) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  if (iStart > iEnd) {
    return NULL;
  }
  XFA_LPCELEMENTINFO pInfo = XFA_GetElementByID(eProperty);
  ASSERT(pInfo != NULL);
  if (dwPacket == XFA_XDPPACKET_UNKNOWN) {
    return pProperty + iMid;
  }
  return (dwPacket & pInfo->dwPackets) ? (pProperty + iMid) : NULL;
}
XFA_LPCNOTSUREATTRIBUTE XFA_GetNotsureAttribute(XFA_ELEMENT eElement,
                                                XFA_ATTRIBUTE eAttribute,
                                                XFA_ATTRIBUTETYPE eType) {
  int32_t iStart = 0, iEnd = g_iXFANotsureCount - 1;
  do {
    int32_t iMid = (iStart + iEnd) / 2;
    XFA_LPCNOTSUREATTRIBUTE pAttr = g_XFANotsureAttributes + iMid;
    if (eElement == pAttr->eElement) {
      if (pAttr->eAttribute == eAttribute) {
        if (eType == XFA_ATTRIBUTETYPE_NOTSURE || eType == pAttr->eType) {
          return pAttr;
        }
        return NULL;
      } else {
        int32_t iBefore = iMid - 1;
        if (iBefore >= 0) {
          pAttr = g_XFANotsureAttributes + iBefore;
          while (eElement == pAttr->eElement) {
            if (pAttr->eAttribute == eAttribute) {
              if (eType == XFA_ATTRIBUTETYPE_NOTSURE || eType == pAttr->eType) {
                return pAttr;
              }
              return NULL;
            }
            iBefore--;
            if (iBefore < 0) {
              break;
            }
            pAttr = g_XFANotsureAttributes + iBefore;
          }
        }
        int32_t iAfter = iMid + 1;
        if (iAfter <= g_iXFANotsureCount - 1) {
          pAttr = g_XFANotsureAttributes + iAfter;
          while (eElement == pAttr->eElement) {
            if (pAttr->eAttribute == eAttribute) {
              if (eType == XFA_ATTRIBUTETYPE_NOTSURE || eType == pAttr->eType) {
                return pAttr;
              }
              return NULL;
            }
            iAfter++;
            if (iAfter > g_iXFANotsureCount - 1) {
              break;
            }
            pAttr = g_XFANotsureAttributes + iAfter;
          }
        }
        return NULL;
      }
    } else if (eElement < pAttr->eElement) {
      iEnd = iMid - 1;
    } else {
      iStart = iMid + 1;
    }
  } while (iStart <= iEnd);
  return NULL;
}
int32_t XFA_GetMethodCount() {
  return g_iSomMethodCount;
}
XFA_LPCMETHODINFO XFA_GetMethodByName(XFA_ELEMENT eElement,
                                      const CFX_WideStringC& wsMethodName) {
  int32_t iLength = wsMethodName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  int32_t iElementIndex = eElement;
  while (iElementIndex != -1) {
    XFA_LPCSCRIPTHIERARCHY scriptIndex = g_XFAScriptIndex + iElementIndex;
    int32_t icount = scriptIndex->wMethodCount;
    if (icount == 0) {
      iElementIndex = scriptIndex->wParentIndex;
      continue;
    }
    uint32_t uHash = FX_HashCode_String_GetW(wsMethodName.GetPtr(), iLength);
    int32_t iStart = scriptIndex->wMethodStart, iEnd = iStart + icount - 1;
    do {
      int32_t iMid = (iStart + iEnd) / 2;
      XFA_LPCMETHODINFO pInfo = g_SomMethodData + iMid;
      if (uHash == pInfo->uHash) {
        return pInfo;
      } else if (uHash < pInfo->uHash) {
        iEnd = iMid - 1;
      } else {
        iStart = iMid + 1;
      }
    } while (iStart <= iEnd);
    iElementIndex = scriptIndex->wParentIndex;
  }
  return NULL;
}
XFA_LPCSCRIPTATTRIBUTEINFO XFA_GetScriptAttributeByName(
    XFA_ELEMENT eElement,
    const CFX_WideStringC& wsAttributeName) {
  int32_t iLength = wsAttributeName.GetLength();
  if (iLength == 0) {
    return NULL;
  }
  int32_t iElementIndex = eElement;
  while (iElementIndex != -1) {
    XFA_LPCSCRIPTHIERARCHY scriptIndex = g_XFAScriptIndex + iElementIndex;
    int32_t icount = scriptIndex->wAttributeCount;
    if (icount == 0) {
      iElementIndex = scriptIndex->wParentIndex;
      continue;
    }
    uint32_t uHash = FX_HashCode_String_GetW(wsAttributeName.GetPtr(), iLength);
    int32_t iStart = scriptIndex->wAttributeStart, iEnd = iStart + icount - 1;
    do {
      int32_t iMid = (iStart + iEnd) / 2;
      XFA_LPCSCRIPTATTRIBUTEINFO pInfo = g_SomAttributeData + iMid;
      if (uHash == pInfo->uHash) {
        return pInfo;
      } else if (uHash < pInfo->uHash) {
        iEnd = iMid - 1;
      } else {
        iStart = iMid + 1;
      }
    } while (iStart <= iEnd);
    iElementIndex = scriptIndex->wParentIndex;
  }
  return NULL;
}
void CXFA_Measurement::Set(const CFX_WideStringC& wsMeasure) {
  if (wsMeasure.IsEmpty()) {
    m_fValue = 0;
    m_eUnit = XFA_UNIT_Unknown;
    return;
  }
  int32_t iUsedLen = 0;
  int32_t iOffset = (wsMeasure.GetAt(0) == L'=') ? 1 : 0;
  FX_FLOAT fValue = FX_wcstof(wsMeasure.GetPtr() + iOffset,
                              wsMeasure.GetLength() - iOffset, &iUsedLen);
  XFA_UNIT eUnit = GetUnit(wsMeasure.Mid(iOffset + iUsedLen));
  Set(fValue, eUnit);
}
FX_BOOL CXFA_Measurement::ToString(CFX_WideString& wsMeasure) const {
  switch (GetUnit()) {
    case XFA_UNIT_Mm:
      wsMeasure.Format(L"%.8gmm", GetValue());
      return TRUE;
    case XFA_UNIT_Pt:
      wsMeasure.Format(L"%.8gpt", GetValue());
      return TRUE;
    case XFA_UNIT_In:
      wsMeasure.Format(L"%.8gin", GetValue());
      return TRUE;
    case XFA_UNIT_Cm:
      wsMeasure.Format(L"%.8gcm", GetValue());
      return TRUE;
    case XFA_UNIT_Mp:
      wsMeasure.Format(L"%.8gmp", GetValue());
      return TRUE;
    case XFA_UNIT_Pc:
      wsMeasure.Format(L"%.8gpc", GetValue());
      return TRUE;
    case XFA_UNIT_Em:
      wsMeasure.Format(L"%.8gem", GetValue());
      return TRUE;
    case XFA_UNIT_Percent:
      wsMeasure.Format(L"%.8g%%", GetValue());
      return TRUE;
    default:
      wsMeasure.Format(L"%.8g", GetValue());
      return FALSE;
  }
}
FX_BOOL CXFA_Measurement::ToUnit(XFA_UNIT eUnit, FX_FLOAT& fValue) const {
  fValue = GetValue();
  XFA_UNIT eFrom = GetUnit();
  if (eFrom == eUnit) {
    return TRUE;
  }
  switch (eFrom) {
    case XFA_UNIT_Pt:
      break;
    case XFA_UNIT_Mm:
      fValue *= 72 / 2.54f / 10;
      break;
    case XFA_UNIT_In:
      fValue *= 72;
      break;
    case XFA_UNIT_Cm:
      fValue *= 72 / 2.54f;
      break;
    case XFA_UNIT_Mp:
      fValue *= 0.001f;
      break;
    case XFA_UNIT_Pc:
      fValue *= 12.0f;
      break;
    default:
      fValue = 0;
      return FALSE;
  }
  switch (eUnit) {
    case XFA_UNIT_Pt:
      return TRUE;
    case XFA_UNIT_Mm:
      fValue /= 72 / 2.54f / 10;
      return TRUE;
    case XFA_UNIT_In:
      fValue /= 72;
      return TRUE;
    case XFA_UNIT_Cm:
      fValue /= 72 / 2.54f;
      return TRUE;
    case XFA_UNIT_Mp:
      fValue /= 0.001f;
      return TRUE;
    case XFA_UNIT_Pc:
      fValue /= 12.0f;
      return TRUE;
    default:
      fValue = 0;
      return FALSE;
  }
  return FALSE;
}
XFA_UNIT CXFA_Measurement::GetUnit(const CFX_WideStringC& wsUnit) {
  if (wsUnit == FX_WSTRC(L"mm")) {
    return XFA_UNIT_Mm;
  } else if (wsUnit == FX_WSTRC(L"pt")) {
    return XFA_UNIT_Pt;
  } else if (wsUnit == FX_WSTRC(L"in")) {
    return XFA_UNIT_In;
  } else if (wsUnit == FX_WSTRC(L"cm")) {
    return XFA_UNIT_Cm;
  } else if (wsUnit == FX_WSTRC(L"pc")) {
    return XFA_UNIT_Pc;
  } else if (wsUnit == FX_WSTRC(L"mp")) {
    return XFA_UNIT_Mp;
  } else if (wsUnit == FX_WSTRC(L"em")) {
    return XFA_UNIT_Em;
  } else if (wsUnit == FX_WSTRC(L"%")) {
    return XFA_UNIT_Percent;
  } else {
    return XFA_UNIT_Unknown;
  }
}
IFX_Stream* XFA_CreateWideTextRead(const CFX_WideString& wsBuffer) {
  return new CXFA_WideTextRead(wsBuffer);
}
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;
}
FX_DWORD 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;
  }
  if (m_iPosition < 0) {
    m_iPosition = 0;
  }
  if (m_iPosition > m_wsBuffer.GetLength()) {
    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::ReadString(FX_WCHAR* pStr,
                                      int32_t iMaxLength,
                                      FX_BOOL& bEOS,
                                      int32_t const* pByteSize) {
  if (iMaxLength > m_wsBuffer.GetLength() - m_iPosition) {
    iMaxLength = m_wsBuffer.GetLength() - m_iPosition;
  }
  FXSYS_wcsncpy(pStr, (const FX_WCHAR*)m_wsBuffer + m_iPosition, iMaxLength);
  m_iPosition += iMaxLength;
  bEOS = IsEOF();
  return iMaxLength;
}
FX_WORD CXFA_WideTextRead::GetCodePage() const {
  return (sizeof(FX_WCHAR) == 2) ? FX_CODEPAGE_UTF16LE : FX_CODEPAGE_UTF32LE;
}
FX_WORD CXFA_WideTextRead::SetCodePage(FX_WORD wCodePage) {
  return GetCodePage();
}