static PyObject *
mmap_resize_method(mmap_object *self,
PyObject *args)
{
Py_ssize_t new_size;
CHECK_VALID(NULL);
if (!PyArg_ParseTuple(args, "n:resize", &new_size) ||
!is_resizeable(self)) {
return NULL;
#ifdef MS_WINDOWS
} else {
DWORD dwErrCode = 0;
DWORD off_hi, off_lo, newSizeLow, newSizeHigh;
/* First, unmap the file view */
UnmapViewOfFile(self->data);
self->data = NULL;
/* Close the mapping object */
CloseHandle(self->map_handle);
self->map_handle = NULL;
/* Move to the desired EOF position */
#if SIZEOF_SIZE_T > 4
newSizeHigh = (DWORD)((self->offset + new_size) >> 32);
newSizeLow = (DWORD)((self->offset + new_size) & 0xFFFFFFFF);
off_hi = (DWORD)(self->offset >> 32);
off_lo = (DWORD)(self->offset & 0xFFFFFFFF);
#else
newSizeHigh = 0;
newSizeLow = (DWORD)(self->offset + new_size);
off_hi = 0;
off_lo = (DWORD)self->offset;
#endif
SetFilePointer(self->file_handle,
newSizeLow, &newSizeHigh, FILE_BEGIN);
/* Change the size of the file */
SetEndOfFile(self->file_handle);
/* Create another mapping object and remap the file view */
self->map_handle = CreateFileMapping(
self->file_handle,
NULL,
PAGE_READWRITE,
0,
0,
self->tagname);
if (self->map_handle != NULL) {
self->data = (char *) MapViewOfFile(self->map_handle,
FILE_MAP_WRITE,
off_hi,
off_lo,
new_size);
if (self->data != NULL) {
self->size = new_size;
Py_INCREF(Py_None);
return Py_None;
} else {
dwErrCode = GetLastError();
CloseHandle(self->map_handle);
self->map_handle = NULL;
}
} else {
dwErrCode = GetLastError();
}
PyErr_SetFromWindowsErr(dwErrCode);
return NULL;
#endif /* MS_WINDOWS */
#ifdef UNIX
#ifndef HAVE_MREMAP
} else {
static PyObject *
mmap_resize_method(mmap_object *self,
PyObject *args)
{
Py_ssize_t new_size;
CHECK_VALID(NULL);
if (!PyArg_ParseTuple(args, "n:resize", &new_size) ||
!is_resizeable(self)) {
return NULL;
}
if (new_size < 0 || PY_SSIZE_T_MAX - new_size < self->offset) {
PyErr_SetString(PyExc_ValueError, "new size out of range");
return NULL;
}
{
#ifdef MS_WINDOWS
DWORD dwErrCode = 0;
DWORD off_hi, off_lo, newSizeLow, newSizeHigh;
/* First, unmap the file view */
UnmapViewOfFile(self->data);
self->data = NULL;
/* Close the mapping object */
CloseHandle(self->map_handle);
self->map_handle = NULL;
/* Move to the desired EOF position */
newSizeHigh = (DWORD)((self->offset + new_size) >> 32);
newSizeLow = (DWORD)((self->offset + new_size) & 0xFFFFFFFF);
off_hi = (DWORD)(self->offset >> 32);
off_lo = (DWORD)(self->offset & 0xFFFFFFFF);
SetFilePointer(self->file_handle,
newSizeLow, &newSizeHigh, FILE_BEGIN);
/* Change the size of the file */
SetEndOfFile(self->file_handle);
/* Create another mapping object and remap the file view */
self->map_handle = CreateFileMapping(
self->file_handle,
NULL,
PAGE_READWRITE,
0,
0,
self->tagname);
if (self->map_handle != NULL) {
self->data = (char *) MapViewOfFile(self->map_handle,
FILE_MAP_WRITE,
off_hi,
off_lo,
new_size);
if (self->data != NULL) {
self->size = new_size;
Py_RETURN_NONE;
} else {
dwErrCode = GetLastError();
CloseHandle(self->map_handle);
self->map_handle = NULL;
}
} else {
dwErrCode = GetLastError();
}
PyErr_SetFromWindowsErr(dwErrCode);
return NULL;
#endif /* MS_WINDOWS */
#ifdef UNIX
#ifndef HAVE_MREMAP
PyErr_SetString(PyExc_SystemError,
"mmap: resizing not available--no mremap()");
return NULL;
#else
void *newmap;
if (self->fd != -1 && ftruncate(self->fd, self->offset + new_size) == -1) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
#ifdef MREMAP_MAYMOVE
newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE);
#else
#if defined(__NetBSD__)
newmap = mremap(self->data, self->size, self->data, new_size, 0);
#else
newmap = mremap(self->data, self->size, new_size, 0);
#endif /* __NetBSD__ */
#endif
if (newmap == (void *)-1)
{
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
self->data = newmap;
self->size = new_size;
Py_RETURN_NONE;
#endif /* HAVE_MREMAP */
#endif /* UNIX */
}
}
