Function lufread

src/Setup/unzip.cpp:2687–2698

size_t lufread(void *ptr,size_t size,size_t n,LUFILE *stream)
{ unsigned int toread = (unsigned int)(size*n);
  if (stream->is_handle)
  { DWORD red; BOOL res = ReadFile(stream->h,ptr,toread,&red,NULL);
    if (!res) stream->herr=true;
    return red/size;
  }
  if (stream->pos+toread > stream->len) toread = stream->len-stream->pos;
  memcpy(ptr, (char*)stream->buf + stream->pos, toread); DWORD red = toread;
  stream->pos += red;
  return red/size;
}