Merge pull request #461 from negativeExponent/libchdr

[pcsx_rearmed.git] / deps / lzma-16.04 / C / 7zBuf2.c

/* 7zBuf2.c -- Byte Buffer\r
2014-08-22 : Igor Pavlov : Public domain */\r
\r
#include "Precomp.h"\r
\r
#include <string.h>\r
\r
#include "7zBuf.h"\r
\r
void DynBuf_Construct(CDynBuf *p)\r
{\r
  p->data = 0;\r
  p->size = 0;\r
  p->pos = 0;\r
}\r
\r
void DynBuf_SeekToBeg(CDynBuf *p)\r
{\r
  p->pos = 0;\r
}\r
\r
int DynBuf_Write(CDynBuf *p, const Byte *buf, size_t size, ISzAlloc *alloc)\r
{\r
  if (size > p->size - p->pos)\r
  {\r
    size_t newSize = p->pos + size;\r
    Byte *data;\r
    newSize += newSize / 4;\r
    data = (Byte *)alloc->Alloc(alloc, newSize);\r
    if (data == 0)\r
      return 0;\r
    p->size = newSize;\r
    memcpy(data, p->data, p->pos);\r
    alloc->Free(alloc, p->data);\r
    p->data = data;\r
  }\r
  if (size != 0)\r
  {\r
    memcpy(p->data + p->pos, buf, size);\r
    p->pos += size;\r
  }\r
  return 1;\r
}\r
\r
void DynBuf_Free(CDynBuf *p, ISzAlloc *alloc)\r
{\r
  alloc->Free(alloc, p->data);\r
  p->data = 0;\r
  p->size = 0;\r
  p->pos = 0;\r
}\r