1/* 7zBuf2.c -- Byte Buffer
 22014-08-22 : 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  if (size != 0)
38  {
39    memcpy(p->data + p->pos, buf, size);
40    p->pos += size;
41  }
42  return 1;
43}
44
45void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)
46{
47  alloc->Free(alloc, p->data);
48  p->data = 0;
49  p->size = 0;
50  p->pos = 0;
51}