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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
#ifndef XFA_FDE_CSS_CFDE_CSSTEXTBUF_H_
#define XFA_FDE_CSS_CFDE_CSSTEXTBUF_H_
#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_system.h"
#include "xfa/fgas/crt/ifgas_stream.h"
class CFDE_CSSTextBuf {
public:
CFDE_CSSTextBuf();
~CFDE_CSSTextBuf();
bool AttachBuffer(const wchar_t* pBuffer, int32_t iBufLen);
bool EstimateSize(int32_t iAllocSize);
int32_t LoadFromStream(const CFX_RetainPtr<IFGAS_Stream>& pTxtStream,
int32_t iStreamOffset,
int32_t iMaxChars,
bool& bEOS);
bool AppendChar(wchar_t wch) {
if (m_iDatLen >= m_iBufLen && !ExpandBuf(m_iBufLen * 2))
return false;
m_pBuffer[m_iDatLen++] = wch;
return true;
}
void Clear() { m_iDatPos = m_iDatLen = 0; }
void Reset();
int32_t TrimEnd() {
while (m_iDatLen > 0 && m_pBuffer[m_iDatLen - 1] <= ' ')
--m_iDatLen;
AppendChar(0);
return --m_iDatLen;
}
void Subtract(int32_t iStart, int32_t iLength);
bool IsEOF() const { return m_iDatPos >= m_iDatLen; }
wchar_t GetAt(int32_t index) const { return m_pBuffer[index]; }
wchar_t GetChar() const { return m_pBuffer[m_iDatPos]; }
wchar_t GetNextChar() const {
return (m_iDatPos + 1 >= m_iDatLen) ? 0 : m_pBuffer[m_iDatPos + 1];
}
void MoveNext() { m_iDatPos++; }
int32_t GetLength() const { return m_iDatLen; }
const wchar_t* GetBuffer() const { return m_pBuffer; }
protected:
bool ExpandBuf(int32_t iDesiredSize);
bool m_bExtBuf;
wchar_t* m_pBuffer;
int32_t m_iBufLen;
int32_t m_iDatLen;
int32_t m_iDatPos;
};
#endif // XFA_FDE_CSS_CFDE_CSSTEXTBUF_H_
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