xref: /third_party/lzma/C/7zBuf2.c (revision 370b324c) 
1/* 7zBuf2.c -- Byte Buffer
22017-04-03 : 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, ISzAllocPtr 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 *)ISzAlloc_Alloc(alloc, newSize);
30    if (!data)
31      return 0;
32    p->size = newSize;
33    if (p->pos != 0)
34      memcpy(data, p->data, p->pos);
35    ISzAlloc_Free(alloc, p->data);
36    p->data = data;
37  }
38  if (size != 0)
39  {
40    memcpy(p->data + p->pos, buf, size);
41    p->pos += size;
42  }
43  return 1;
44}
45
46void DynBuf_Free(CDynBuf *p, ISzAllocPtr alloc)
47{
48  ISzAlloc_Free(alloc, p->data);
49  p->data = 0;
50  p->size = 0;
51  p->pos = 0;
52}
53