nel/3rdparty/seven_zip/7zBuf2.c

   1 /* 7zBuf2.c -- Byte Buffer
   2 2017-04-03 : 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, 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
  46 void 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 }