1/* 7zBuf2.c -- Byte Buffer
 22013-11-12 : Igor Pavlov : Public domain */
 3
 4#include "Precomp.h"
 5
 6#include <string.h>
 7
 8#include "7zBuf.h"
 9
10void DynBuf_Construct(CDynBuf *p)
11{
12  p->data = 0;
13  p->size = 0;
14  p->pos = 0;
15}
16
17void DynBuf_SeekToBeg(CDynBuf *p)
18{
19  p->pos = 0;
20}
21
22int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)
23{
24  if (size > p->size - p->pos)
25  {
26    size_t newSize = p->pos + size;
27    Byte *data;
28    newSize += newSize / 4;
29    data = (Byte *)alloc->Alloc(alloc, newSize);
30    if (data == 0)
31      return 0;
32    p->size = newSize;
33    memcpy(data, p->data, p->pos);
34    alloc->Free(alloc, p->data);
35    p->data = data;
36  }
37  memcpy(p->data + p->pos, buf, size);
38  p->pos += size;
39  return 1;
40}
41
42void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)
43{
44  alloc->Free(alloc, p->data);
45  p->data = 0;
46  p->size = 0;
47  p->pos = 0;
48}