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/******************************************************************************
*
*
*
*
* Copyright (C) 1997-2015 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
*/
#ifndef _BUFSTR_H
#define _BUFSTR_H
#include <cstdlib>
#include "qcstring.h"
/*! @brief Buffer used to store strings
*
* This buffer is used append characters and strings. It will automatically
* resize itself, yet provide efficient random access to the content.
*/
class BufStr
{
public:
BufStr(uint size)
: m_size(size), m_writeOffset(0), m_spareRoom(10240), m_buf(0)
{
m_buf = (char *)calloc(size,1);
}
~BufStr()
{
free(m_buf);
}
void addChar(char c)
{
makeRoomFor(1);
m_buf[m_writeOffset++]=c;
}
void addArray(const char *a,uint len)
{
makeRoomFor(len);
memcpy(m_buf+m_writeOffset,a,len);
m_writeOffset+=len;
}
void skip(uint s)
{
makeRoomFor(s);
m_writeOffset+=s;
}
void shrink( uint newlen )
{
m_writeOffset=newlen;
resize(newlen);
}
void resize( uint newlen )
{
uint oldsize = m_size;
m_size=newlen;
if (m_writeOffset>=m_size) // offset out of range -> enlarge
{
m_size=m_writeOffset+m_spareRoom;
}
m_buf = (char *)realloc(m_buf,m_size);
if (m_size>oldsize)
{
memset(m_buf+oldsize,0,m_size-oldsize);
}
}
uint size() const
{
return m_size;
}
char *data() const
{
return m_buf;
}
char &at(uint i) const
{
return m_buf[i];
}
bool isEmpty() const
{
return m_writeOffset==0;
}
operator const char *() const
{
return m_buf;
}
uint curPos() const
{
return m_writeOffset;
}
void dropFromStart(uint bytes)
{
if (bytes>m_size) bytes=m_size;
if (bytes>0) qmemmove(m_buf,m_buf+bytes,m_size-bytes);
m_size-=bytes;
m_writeOffset-=bytes;
}
private:
void makeRoomFor(uint size)
{
if (m_writeOffset+size>=m_size)
{
resize(m_size+size+m_spareRoom);
}
}
uint m_size;
uint m_writeOffset;
const uint m_spareRoom; // 10Kb extra room to avoid frequent resizing
char *m_buf;
};
#endif
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