1/* 7zBuf2.c -- Byte Buffer
22008-10-04 : Igor Pavlov : Public domain */
3
4#include <string.h>
5#include "7zBuf.h"
6
7void DynBuf_Construct(CDynBuf *p)
8{
9  p->data = 0;
10  p->size = 0;
11  p->pos = 0;
12}
13
14void DynBuf_SeekToBeg(CDynBuf *p)
15{
16  p->pos = 0;
17}
18
19int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)
20{
21  if (size > p->size - p->pos)
22  {
23    size_t newSize = p->pos + size;
24    Byte *data;
25    newSize += newSize / 4;
26    data = (Byte *)alloc->Alloc(alloc, newSize);
27    if (data == 0)
28      return 0;
29    p->size = newSize;
30    memcpy(data, p->data, p->pos);
31    alloc->Free(alloc, p->data);
32    p->data = data;
33  }
34  memcpy(p->data + p->pos, buf, size);
35  p->pos += size;
36  return 1;
37}
38
39void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)
40{
41  alloc->Free(alloc, p->data);
42  p->data = 0;
43  p->size = 0;
44  p->pos = 0;
45}
46