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// Copyright 2017 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/css/cfde_csstextbuf.h"
#include <algorithm>
CFDE_CSSTextBuf::CFDE_CSSTextBuf()
: m_bExtBuf(false),
m_pBuffer(nullptr),
m_iBufLen(0),
m_iDatLen(0),
m_iDatPos(0) {}
CFDE_CSSTextBuf::~CFDE_CSSTextBuf() {
Reset();
}
void CFDE_CSSTextBuf::Reset() {
if (!m_bExtBuf) {
FX_Free(m_pBuffer);
m_pBuffer = nullptr;
}
m_iDatPos = m_iDatLen = m_iBufLen;
}
bool CFDE_CSSTextBuf::AttachBuffer(const wchar_t* pBuffer, int32_t iBufLen) {
Reset();
m_pBuffer = const_cast<wchar_t*>(pBuffer);
m_iDatLen = m_iBufLen = iBufLen;
return m_bExtBuf = true;
}
bool CFDE_CSSTextBuf::EstimateSize(int32_t iAllocSize) {
ASSERT(iAllocSize > 0);
Clear();
m_bExtBuf = false;
return ExpandBuf(iAllocSize);
}
int32_t CFDE_CSSTextBuf::LoadFromStream(
const CFX_RetainPtr<IFGAS_Stream>& pTxtStream,
int32_t iStreamOffset,
int32_t iMaxChars,
bool& bEOS) {
ASSERT(iStreamOffset >= 0 && iMaxChars > 0);
Clear();
m_bExtBuf = false;
if (!ExpandBuf(iMaxChars))
return 0;
if (pTxtStream->GetPosition() != iStreamOffset)
pTxtStream->Seek(FX_STREAMSEEK_Begin, iStreamOffset);
m_iDatLen = pTxtStream->ReadString(m_pBuffer, iMaxChars, bEOS);
return m_iDatLen;
}
bool CFDE_CSSTextBuf::ExpandBuf(int32_t iDesiredSize) {
if (m_bExtBuf)
return false;
if (!m_pBuffer)
m_pBuffer = FX_Alloc(wchar_t, iDesiredSize);
else if (m_iBufLen != iDesiredSize)
m_pBuffer = FX_Realloc(wchar_t, m_pBuffer, iDesiredSize);
else
return true;
if (!m_pBuffer) {
m_iBufLen = 0;
return false;
}
m_iBufLen = iDesiredSize;
return true;
}
void CFDE_CSSTextBuf::Subtract(int32_t iStart, int32_t iLength) {
ASSERT(iStart >= 0 && iLength >= 0);
iLength = std::max(std::min(iLength, m_iDatLen - iStart), 0);
FXSYS_memmove(m_pBuffer, m_pBuffer + iStart, iLength * sizeof(wchar_t));
m_iDatLen = iLength;
}
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