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// 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
#ifndef CORE_FXCRT_FX_BASIC_H_
#define CORE_FXCRT_FX_BASIC_H_
#include <algorithm>
#include <memory>
#include <vector>
#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/fx_system.h"
#ifdef PDF_ENABLE_XFA
#define FX_IsOdd(a) ((a)&1)
#endif // PDF_ENABLE_XFA
class CFX_BinaryBuf {
public:
CFX_BinaryBuf();
explicit CFX_BinaryBuf(FX_STRSIZE size);
~CFX_BinaryBuf();
uint8_t* GetBuffer() const { return m_pBuffer.get(); }
FX_STRSIZE GetSize() const { return m_DataSize; }
void Clear();
void EstimateSize(FX_STRSIZE size, FX_STRSIZE alloc_step = 0);
void AppendBlock(const void* pBuf, FX_STRSIZE size);
void AppendString(const CFX_ByteString& str) {
AppendBlock(str.c_str(), str.GetLength());
}
void AppendByte(uint8_t byte) {
ExpandBuf(1);
m_pBuffer.get()[m_DataSize++] = byte;
}
void InsertBlock(FX_STRSIZE pos, const void* pBuf, FX_STRSIZE size);
void Delete(FX_STRSIZE start_index, FX_STRSIZE count);
// Releases ownership of |m_pBuffer| and returns it.
std::unique_ptr<uint8_t, FxFreeDeleter> DetachBuffer();
protected:
void ExpandBuf(FX_STRSIZE size);
FX_STRSIZE m_AllocStep;
FX_STRSIZE m_AllocSize;
FX_STRSIZE m_DataSize;
std::unique_ptr<uint8_t, FxFreeDeleter> m_pBuffer;
};
class CFX_WideTextBuf : public CFX_BinaryBuf {
public:
void AppendChar(wchar_t wch);
FX_STRSIZE GetLength() const { return m_DataSize / sizeof(wchar_t); }
wchar_t* GetBuffer() const {
return reinterpret_cast<wchar_t*>(m_pBuffer.get());
}
CFX_WideStringC AsStringC() const {
return CFX_WideStringC(reinterpret_cast<const wchar_t*>(m_pBuffer.get()),
m_DataSize / sizeof(wchar_t));
}
CFX_WideString MakeString() const {
return CFX_WideString(reinterpret_cast<const wchar_t*>(m_pBuffer.get()),
m_DataSize / sizeof(wchar_t));
}
void Delete(int start_index, int count) {
CFX_BinaryBuf::Delete(start_index * sizeof(wchar_t),
count * sizeof(wchar_t));
}
CFX_WideTextBuf& operator<<(int i);
CFX_WideTextBuf& operator<<(double f);
CFX_WideTextBuf& operator<<(const wchar_t* lpsz);
CFX_WideTextBuf& operator<<(const CFX_WideStringC& str);
CFX_WideTextBuf& operator<<(const CFX_WideString& str);
CFX_WideTextBuf& operator<<(const CFX_WideTextBuf& buf);
};
class CFX_UTF8Decoder {
public:
CFX_UTF8Decoder() { m_PendingBytes = 0; }
void Clear();
void Input(uint8_t byte);
void AppendCodePoint(uint32_t ch);
void ClearStatus() { m_PendingBytes = 0; }
CFX_WideStringC GetResult() const { return m_Buffer.AsStringC(); }
private:
int m_PendingBytes;
uint32_t m_PendingChar;
CFX_WideTextBuf m_Buffer;
};
class CFX_UTF8Encoder {
public:
CFX_UTF8Encoder();
~CFX_UTF8Encoder();
void Input(wchar_t unicode);
void AppendStr(const CFX_ByteStringC& str);
// The data returned by GetResult() is invalidated when this is modified by
// appending any data.
CFX_ByteStringC GetResult() const;
private:
std::vector<uint8_t> m_Buffer;
};
template <class DataType, int FixedSize>
class CFX_FixedBufGrow {
public:
explicit CFX_FixedBufGrow(int data_size) {
if (data_size > FixedSize) {
m_pGrowData.reset(FX_Alloc(DataType, data_size));
return;
}
memset(m_FixedData, 0, sizeof(DataType) * FixedSize);
}
operator DataType*() { return m_pGrowData ? m_pGrowData.get() : m_FixedData; }
private:
DataType m_FixedData[FixedSize];
std::unique_ptr<DataType, FxFreeDeleter> m_pGrowData;
};
class CFX_BitStream {
public:
void Init(const uint8_t* pData, uint32_t dwSize);
void ByteAlign();
bool IsEOF() const { return m_BitPos >= m_BitSize; }
uint32_t GetBits(uint32_t nBits);
void SkipBits(uint32_t nBits) { m_BitPos += nBits; }
void Rewind() { m_BitPos = 0; }
uint32_t GetPos() const { return m_BitPos; }
uint32_t BitsRemaining() const {
return m_BitSize >= m_BitPos ? m_BitSize - m_BitPos : 0;
}
private:
uint32_t m_BitPos;
uint32_t m_BitSize;
const uint8_t* m_pData;
};
class IFX_Pause {
public:
virtual ~IFX_Pause() {}
virtual bool NeedToPauseNow() = 0;
};
template <typename T>
class CFX_AutoRestorer {
public:
explicit CFX_AutoRestorer(T* location)
: m_Location(location), m_OldValue(*location) {}
~CFX_AutoRestorer() { *m_Location = m_OldValue; }
private:
T* const m_Location;
const T m_OldValue;
};
uint32_t GetBits32(const uint8_t* pData, int bitpos, int nbits);
#endif // CORE_FXCRT_FX_BASIC_H_
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