1 /* 7zBuf2.c -- Byte Buffer
2 2008-10-04 : Igor Pavlov : Public domain */
3
4 #include <string.h>
5 #include "7zBuf.h"
6
DynBuf_Construct(CDynBuf * p)7 void DynBuf_Construct(CDynBuf *p)
8 {
9 p->data = 0;
10 p->size = 0;
11 p->pos = 0;
12 }
13
DynBuf_SeekToBeg(CDynBuf * p)14 void DynBuf_SeekToBeg(CDynBuf *p)
15 {
16 p->pos = 0;
17 }
18
DynBuf_Write(CDynBuf * p,const Byte * buf,size_t size,ISzAlloc * alloc)19 int 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
DynBuf_Free(CDynBuf * p,ISzAlloc * alloc)39 void 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