122 lines
3.2 KiB
Rust
122 lines
3.2 KiB
Rust
use core::mem::transmute;
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#[inline(always)]
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pub(crate) fn to_big_endian_u16(n: u16) -> [u8; 2] {
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let ptr = unsafe { transmute::<*const u16, *const u8>(&n as *const u16) };
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if cfg!(target_endian = "little") {
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unsafe { [*ptr.offset(1), *ptr] }
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} else {
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unsafe { [*ptr, *ptr.offset(1)] }
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}
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}
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#[inline(always)]
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pub(crate) fn from_big_endian_u16(n: [u8; 2]) -> u16 {
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let mut x: u16 = 0;
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let ptr = unsafe { transmute::<*mut u16, *mut u8>(&mut x as *mut u16) };
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if cfg!(target_endian = "little") {
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unsafe {
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*ptr = n[1];
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*ptr.offset(1) = n[0];
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}
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} else {
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unsafe {
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*ptr = n[0];
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*ptr.offset(1) = n[1];
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}
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}
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x
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}
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#[inline(always)]
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pub(crate) fn to_little_endian_u16(n: u16) -> [u8; 2] {
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let ptr = unsafe { transmute::<*const u16, *const u8>(&n as *const u16) };
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if cfg!(target_endian = "little") {
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unsafe { [*ptr, *ptr.offset(1)] }
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} else {
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unsafe { [*ptr.offset(1), *ptr] }
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}
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}
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#[inline(always)]
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pub(crate) fn from_little_endian_u16(n: [u8; 2]) -> u16 {
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let mut x: u16 = 0;
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let ptr = unsafe { transmute::<*mut u16, *mut u8>(&mut x as *mut u16) };
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if cfg!(target_endian = "little") {
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unsafe {
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*ptr = n[0];
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*ptr.offset(1) = n[1];
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}
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} else {
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unsafe {
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*ptr = n[1];
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*ptr.offset(1) = n[0];
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}
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}
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x
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}
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#[inline(always)]
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pub(crate) fn to_big_endian_u32(n: u32) -> [u8; 4] {
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let ptr = unsafe { transmute::<*const u32, *const u8>(&n as *const u32) };
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if cfg!(target_endian = "little") {
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unsafe { [*ptr.offset(3), *ptr.offset(2), *ptr.offset(1), *ptr] }
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} else {
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unsafe { [*ptr, *ptr.offset(1), *ptr.offset(2), *ptr.offset(3)] }
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}
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}
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#[inline(always)]
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pub(crate) fn from_big_endian_u32(n: [u8; 4]) -> u32 {
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let mut x: u32 = 0;
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let ptr = unsafe { transmute::<*mut u32, *mut u8>(&mut x as *mut u32) };
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if cfg!(target_endian = "little") {
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unsafe {
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*ptr = n[3];
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*ptr.offset(1) = n[2];
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*ptr.offset(2) = n[1];
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*ptr.offset(3) = n[0];
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}
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} else {
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unsafe {
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*ptr = n[0];
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*ptr.offset(1) = n[1];
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*ptr.offset(2) = n[2];
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*ptr.offset(3) = n[3];
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}
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}
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x
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}
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#[inline(always)]
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pub(crate) fn to_little_endian_u32(n: u32) -> [u8; 4] {
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let ptr = unsafe { transmute::<*const u32, *const u8>(&n as *const u32) };
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if cfg!(target_endian = "little") {
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unsafe { [*ptr, *ptr.offset(1), *ptr.offset(2), *ptr.offset(3)] }
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} else {
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unsafe { [*ptr.offset(3), *ptr.offset(2), *ptr.offset(1), *ptr] }
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}
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}
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#[inline(always)]
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pub(crate) fn from_little_endian_u32(n: [u8; 4]) -> u32 {
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let mut x: u32 = 0;
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let ptr = unsafe { transmute::<*mut u32, *mut u8>(&mut x as *mut u32) };
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if cfg!(target_endian = "little") {
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unsafe {
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*ptr = n[0];
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*ptr.offset(1) = n[1];
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*ptr.offset(2) = n[2];
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*ptr.offset(3) = n[3];
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}
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} else {
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unsafe {
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*ptr = n[3];
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*ptr.offset(1) = n[2];
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*ptr.offset(2) = n[1];
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*ptr.offset(3) = n[0];
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}
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}
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x
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}
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