InputStream.h

// SPDX-FileCopyrightText: 2007 Dominik Seichter <domseichter@web.de>
// SPDX-FileCopyrightText: 2020 Francesco Pretto <ceztko@gmail.com>
// SPDX-License-Identifier: LGPL-2.0-or-later OR MPL-2.0
 
#ifndef AUX_INPUT_STREAM_H
#define AUX_INPUT_STREAM_H
 
#include "basedefs.h"
 
namespace PoDoFo {
 
class OutputStream;
 
class PODOFO_API InputStream
{
public:
    InputStream();
    virtual ~InputStream();
 
    void Read(char* buffer, size_t size);
 
    size_t Read(char* buffer, size_t size, bool& eof);
 
    char ReadChar();
 
    bool Read(char& ch);
 
    void CopyTo(OutputStream& stream);
 
    void CopyTo(OutputStream& stream, size_t size);
 
protected:
    static size_t ReadBuffer(InputStream& stream, char* buffer, size_t size, bool& eof);
    static bool ReadChar(InputStream& stream, char& ch);
 
protected:
    virtual size_t readBuffer(char* buffer, size_t size, bool& eof) = 0;
 
    virtual bool readChar(char& ch);
 
    virtual void checkRead() const;
 
protected:
    const char* m_head;
    const char* m_tail;
 
private:
    void readSlowPath(char* buffer, size_t size);
    size_t readSlowPath(char* buffer, size_t size, bool& eof);
    char readCharSlowPath();
    bool tryReadCharSlowPath(char& ch);
 
private:
    InputStream(const InputStream&) = delete;
    InputStream& operator=(const InputStream&) = delete;
};
 
};
 
#endif // AUX_INPUT_STREAM_H