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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "xfa/fxfa/parser/cxfa_widetextread.h"
      8 
      9 #include <algorithm>
     10 
     11 #include "core/fxcrt/fx_ext.h"
     12 #include "xfa/fgas/crt/fgas_codepage.h"
     13 
     14 CXFA_WideTextRead::CXFA_WideTextRead(const CFX_WideString& wsBuffer)
     15     : m_wsBuffer(wsBuffer), m_iPosition(0) {}
     16 
     17 CXFA_WideTextRead::~CXFA_WideTextRead() {}
     18 
     19 uint32_t CXFA_WideTextRead::GetAccessModes() const {
     20   return FX_STREAMACCESS_Read | FX_STREAMACCESS_Text;
     21 }
     22 
     23 int32_t CXFA_WideTextRead::GetLength() const {
     24   return m_wsBuffer.GetLength() * sizeof(FX_WCHAR);
     25 }
     26 
     27 int32_t CXFA_WideTextRead::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
     28   switch (eSeek) {
     29     case FX_STREAMSEEK_Begin:
     30       m_iPosition = iOffset;
     31       break;
     32     case FX_STREAMSEEK_Current:
     33       m_iPosition += iOffset;
     34       break;
     35     case FX_STREAMSEEK_End:
     36       m_iPosition = m_wsBuffer.GetLength() + iOffset;
     37       break;
     38   }
     39   m_iPosition = std::min(std::max(0, m_iPosition), m_wsBuffer.GetLength());
     40   return GetPosition();
     41 }
     42 
     43 int32_t CXFA_WideTextRead::GetPosition() {
     44   return m_iPosition * sizeof(FX_WCHAR);
     45 }
     46 
     47 bool CXFA_WideTextRead::IsEOF() const {
     48   return m_iPosition >= m_wsBuffer.GetLength();
     49 }
     50 
     51 int32_t CXFA_WideTextRead::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
     52   return 0;
     53 }
     54 
     55 int32_t CXFA_WideTextRead::ReadString(FX_WCHAR* pStr,
     56                                       int32_t iMaxLength,
     57                                       bool& bEOS) {
     58   iMaxLength = std::min(iMaxLength, m_wsBuffer.GetLength() - m_iPosition);
     59   if (iMaxLength == 0)
     60     return 0;
     61 
     62   FXSYS_wcsncpy(pStr, m_wsBuffer.c_str() + m_iPosition, iMaxLength);
     63   m_iPosition += iMaxLength;
     64   bEOS = IsEOF();
     65   return iMaxLength;
     66 }
     67 
     68 int32_t CXFA_WideTextRead::WriteData(const uint8_t* pBuffer,
     69                                      int32_t iBufferSize) {
     70   return 0;
     71 }
     72 
     73 int32_t CXFA_WideTextRead::WriteString(const FX_WCHAR* pStr, int32_t iLength) {
     74   return 0;
     75 }
     76 
     77 bool CXFA_WideTextRead::SetLength(int32_t iLength) {
     78   return false;
     79 }
     80 
     81 int32_t CXFA_WideTextRead::GetBOM(uint8_t bom[4]) const {
     82   return 0;
     83 }
     84 
     85 uint16_t CXFA_WideTextRead::GetCodePage() const {
     86   return (sizeof(FX_WCHAR) == 2) ? FX_CODEPAGE_UTF16LE : FX_CODEPAGE_UTF32LE;
     87 }
     88 
     89 uint16_t CXFA_WideTextRead::SetCodePage(uint16_t wCodePage) {
     90   return GetCodePage();
     91 }
     92 
     93 CFX_RetainPtr<IFGAS_Stream> CXFA_WideTextRead::CreateSharedStream(
     94     uint32_t dwAccess,
     95     int32_t iOffset,
     96     int32_t iLength) {
     97   return nullptr;
     98 }
     99 
    100 CFX_WideString CXFA_WideTextRead::GetSrcText() const {
    101   return m_wsBuffer;
    102 }
    103