kylefang/stacks-puppet-node
1
0
Fork 0
mirror of https://github.com/alexgo-io/stacks-puppet-node.git synced 2026-05-24 08:09:52 +08:00
Code Issues Packages Projects Releases Wiki Activity

careful when encoding/decoding big-endian -- make sure it's a no-op on a big-endian machine

Browse Source
This commit is contained in:
Jude Nelson
2019-03-09 18:53:32 -05:00
parent cca69ca928
commit eeb549bb52
1 changed files with 10 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/util/macros.rs
View File

@@ -17,6 +17,11 @@
along with Blockstack. If not, see <http://www.gnu.org/licenses/>.
*/
// is this machine big-endian?
fn is_big_endian() -> bool {
u32::from_be(0x1Au32) == 0x1Au32
}
/// Borrowed from Andrew Poelstra's rust-bitcoin
macro_rules! impl_array_newtype {
($thing:ident, $ty:ty, $len:expr) => {
@@ -220,7 +225,7 @@ macro_rules! impl_byte_array_newtype {
}
}
/// Instantiates from a (little-endian) slice of bytes
/// Instantiates from a slice of bytes
#[allow(dead_code)]
pub fn from_bytes(inp: &[u8]) -> Option<$thing> {
match inp.len() {
@@ -233,13 +238,13 @@ macro_rules! impl_byte_array_newtype {
}
}
/// Instantiates from a (big-endian) slice of bytes
/// Instantiates from a slice of bytes, converting to host byte order
#[allow(dead_code)]
pub fn from_bytes_be(inp: &[u8]) -> Option<$thing> {
$thing::from_vec_be(&inp.to_vec())
}
/// Instantiates from a (little-endian) vector of bytes
/// Instantiates from a vector of bytes
#[allow(dead_code)]
pub fn from_vec(inp: &Vec<u8>) -> Option<$thing> {
match inp.len() {
@@ -253,15 +258,15 @@ macro_rules! impl_byte_array_newtype {
}
}
/// Instantiates from a big-endian vector of bytes
/// Instantiates from a big-endian vector of bytes, converting to host byte order
#[allow(dead_code)]
pub fn from_vec_be(b: &Vec<u8>) -> Option<$thing> {
match b.len() {
$len => {
let mut ret = [0; $len];
let bytes = &b[0..b.len()];
// flip endian to le if we are le
for i in 0..$len {
// flip endian to le
ret[$len - 1 - i] = bytes[i];
}
Some($thing(ret))