/* 7zBuf2.c -- Byte Buffer

2017-04-03 : Igor Pavlov : Public domain */

#include "Precomp.h"

#include <string.h>

#include "7zBuf.h"

void DynBuf_Construct(CDynBuf *p)

{

  p->data = 0;

  p->size = 0;

  p->pos = 0;

}

void DynBuf_SeekToBeg(CDynBuf *p)

{

  p->pos = 0;

}

int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAllocPtr alloc)

{

  if (size > p->size - p->pos)

  {

    size_t newSize = p->pos + size;

    Byte *data;

    newSize += newSize / 4;

    data = (Byte *)ISzAlloc_Alloc(alloc, newSize);

    if (!data)

      return 0;

    p->size = newSize;

    if (p->pos != 0)

      memcpy(data, p->data, p->pos);

    ISzAlloc_Free(alloc, p->data);

    p->data = data;

  }

  if (size != 0)

  {

    memcpy(p->data + p->pos, buf, size);

    p->pos += size;

  }

  return 1;

}

void DynBuf_Free(CDynBuf *p, ISzAllocPtr alloc)

{

  ISzAlloc_Free(alloc, p->data);

  p->data = 0;

  p->size = 0;

  p->pos = 0;

}