ce188d4d |
1 | /* 7zBuf2.c -- Byte Buffer\r |
2 | 2014-08-22 : Igor Pavlov : Public domain */\r |
3 | \r |
4 | #include "Precomp.h"\r |
5 | \r |
6 | #include <string.h>\r |
7 | \r |
8 | #include "7zBuf.h"\r |
9 | \r |
10 | void DynBuf_Construct(CDynBuf *p)\r |
11 | {\r |
12 | p->data = 0;\r |
13 | p->size = 0;\r |
14 | p->pos = 0;\r |
15 | }\r |
16 | \r |
17 | void DynBuf_SeekToBeg(CDynBuf *p)\r |
18 | {\r |
19 | p->pos = 0;\r |
20 | }\r |
21 | \r |
22 | int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)\r |
23 | {\r |
24 | if (size > p->size - p->pos)\r |
25 | {\r |
26 | size_t newSize = p->pos + size;\r |
27 | Byte *data;\r |
28 | newSize += newSize / 4;\r |
29 | data = (Byte *)alloc->Alloc(alloc, newSize);\r |
30 | if (data == 0)\r |
31 | return 0;\r |
32 | p->size = newSize;\r |
33 | memcpy(data, p->data, p->pos);\r |
34 | alloc->Free(alloc, p->data);\r |
35 | p->data = data;\r |
36 | }\r |
37 | if (size != 0)\r |
38 | {\r |
39 | memcpy(p->data + p->pos, buf, size);\r |
40 | p->pos += size;\r |
41 | }\r |
42 | return 1;\r |
43 | }\r |
44 | \r |
45 | void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)\r |
46 | {\r |
47 | alloc->Free(alloc, p->data);\r |
48 | p->data = 0;\r |
49 | p->size = 0;\r |
50 | p->pos = 0;\r |
51 | }\r |