1 /* 7zBuf2.c -- Byte Buffer 2 2014-08-22 : Igor Pavlov : Public domain */ 3 4 #include "Precomp.h" 5 6 #include <string.h> 7 8 #include "7zBuf.h" 9 10 void DynBuf_Construct(CDynBuf *p) 11 { 12 p->data = 0; 13 p->size = 0; 14 p->pos = 0; 15 } 16 17 void DynBuf_SeekToBeg(CDynBuf *p) 18 { 19 p->pos = 0; 20 } 21 22 int 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 45 void 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 } 52
