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|
#[repr(C)]
#[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct __BindgenBitfieldUnit<Storage> {
storage: Storage,
}
impl<Storage> __BindgenBitfieldUnit<Storage> {
#[inline]
pub const fn new(storage: Storage) -> Self {
Self { storage }
}
}
impl<Storage> __BindgenBitfieldUnit<Storage>
where
Storage: AsRef<[u8]> + AsMut<[u8]>,
{
#[inline]
fn extract_bit(byte: u8, index: usize) -> bool {
let bit_index = if cfg!(target_endian = "big") {
7 - (index % 8)
} else {
index % 8
};
let mask = 1 << bit_index;
byte & mask == mask
}
#[inline]
pub fn get_bit(&self, index: usize) -> bool {
debug_assert!(index / 8 < self.storage.as_ref().len());
let byte_index = index / 8;
let byte = self.storage.as_ref()[byte_index];
Self::extract_bit(byte, index)
}
#[inline]
pub unsafe fn raw_get_bit(this: *const Self, index: usize) -> bool {
debug_assert!(index / 8 < core::mem::size_of::<Storage>());
let byte_index = index / 8;
let byte = unsafe { *(core::ptr::addr_of!((*this).storage) as *const u8)
.offset(byte_index as isize) };
Self::extract_bit(byte, index)
}
#[inline]
fn change_bit(byte: u8, index: usize, val: bool) -> u8 {
let bit_index = if cfg!(target_endian = "big") {
7 - (index % 8)
} else {
index % 8
};
let mask = 1 << bit_index;
if val {
byte | mask
} else {
byte & !mask
}
}
#[inline]
pub fn set_bit(&mut self, index: usize, val: bool) {
debug_assert!(index / 8 < self.storage.as_ref().len());
let byte_index = index / 8;
let byte = &mut self.storage.as_mut()[byte_index];
*byte = Self::change_bit(*byte, index, val);
}
#[inline]
pub unsafe fn raw_set_bit(this: *mut Self, index: usize, val: bool) {
debug_assert!(index / 8 < core::mem::size_of::<Storage>());
let byte_index = index / 8;
let byte = unsafe {
(core::ptr::addr_of_mut!((*this).storage) as *mut u8)
.offset(byte_index as isize)
};
unsafe { *byte = Self::change_bit(*byte, index, val) };
}
#[inline]
pub fn get(&self, bit_offset: usize, bit_width: u8) -> u64 {
debug_assert!(bit_width <= 64);
debug_assert!(bit_offset / 8 < self.storage.as_ref().len());
debug_assert!(
(bit_offset + (bit_width as usize)) / 8 <=
self.storage.as_ref().len()
);
let mut val = 0;
for i in 0..(bit_width as usize) {
if self.get_bit(i + bit_offset) {
let index = if cfg!(target_endian = "big") {
bit_width as usize - 1 - i
} else {
i
};
val |= 1 << index;
}
}
val
}
#[inline]
pub unsafe fn raw_get(
this: *const Self,
bit_offset: usize,
bit_width: u8,
) -> u64 {
debug_assert!(bit_width <= 64);
debug_assert!(bit_offset / 8 < core::mem::size_of::<Storage>());
debug_assert!(
(bit_offset + (bit_width as usize)) / 8 <=
core::mem::size_of::<Storage>()
);
let mut val = 0;
for i in 0..(bit_width as usize) {
if unsafe { Self::raw_get_bit(this, i + bit_offset) } {
let index = if cfg!(target_endian = "big") {
bit_width as usize - 1 - i
} else {
i
};
val |= 1 << index;
}
}
val
}
#[inline]
pub fn set(&mut self, bit_offset: usize, bit_width: u8, val: u64) {
debug_assert!(bit_width <= 64);
debug_assert!(bit_offset / 8 < self.storage.as_ref().len());
debug_assert!(
(bit_offset + (bit_width as usize)) / 8 <=
self.storage.as_ref().len()
);
for i in 0..(bit_width as usize) {
let mask = 1 << i;
let val_bit_is_set = val & mask == mask;
let index = if cfg!(target_endian = "big") {
bit_width as usize - 1 - i
} else {
i
};
self.set_bit(index + bit_offset, val_bit_is_set);
}
}
#[inline]
pub unsafe fn raw_set(
this: *mut Self,
bit_offset: usize,
bit_width: u8,
val: u64,
) {
debug_assert!(bit_width <= 64);
debug_assert!(bit_offset / 8 < core::mem::size_of::<Storage>());
debug_assert!(
(bit_offset + (bit_width as usize)) / 8 <=
core::mem::size_of::<Storage>()
);
for i in 0..(bit_width as usize) {
let mask = 1 << i;
let val_bit_is_set = val & mask == mask;
let index = if cfg!(target_endian = "big") {
bit_width as usize - 1 - i
} else {
i
};
unsafe { Self::raw_set_bit(this, index + bit_offset, val_bit_is_set) };
}
}
}
|
