bool_t
FSFH_release_window(FSFileHandle *self, FileWindow *window)
{
if ( !SI_unmap(self, window->buf, window->len) ) { return false; }
FileWindow_Set_Window(window, NULL, 0, 0);
return true;
}
static INLINE bool_t
SI_window(FSFileHandle *self, FileWindow *window, int64_t offset, int64_t len)
{
// Release the previously mmap'd region, if any.
FSFH_release_window(self, window);
{
// Start map on a page boundary. Ensure that the window is at
// least wide enough to view all the data spec'd in the original
// request.
const int64_t remainder = offset % self->page_size;
const int64_t adjusted_offset = offset - remainder;
const int64_t adjusted_len = len + remainder;
char *const buf
= (char*)SI_map(self, adjusted_offset, adjusted_len);
if (len && buf == NULL) {
return false;
}
else {
FileWindow_Set_Window(window, buf, adjusted_offset,
adjusted_len);
}
}
return true;
}
bool_t
FSFH_release_window(FSFileHandle *self, FileWindow *window)
{
UNUSED_VAR(self);
FileWindow_Set_Window(window, NULL, 0, 0);
return true;
}
static INLINE bool
SI_window(FSFileHandle *self, FSFileHandleIVARS *ivars, FileWindow *window,
int64_t offset, int64_t len) {
UNUSED_VAR(self);
FileWindow_Set_Window(window, ivars->buf + offset, offset, len);
return true;
}
bool
FSFH_release_window(FSFileHandle *self, FileWindow *window) {
char *buf = FileWindow_Get_Buf(window);
int64_t len = FileWindow_Get_Len(window);
if (!SI_unmap(self, buf, len)) { return false; }
FileWindow_Set_Window(window, NULL, 0, 0);
return true;
}
static INLINE bool_t
SI_window(FSFileHandle *self, FileWindow *window, int64_t offset,
int64_t len) {
FileWindow_Set_Window(window, self->buf + offset, offset, len);
return true;
}
