1 files changed, 38 insertions, 0 deletions
diff --git a/vendor/base16ct/src/mixed.rs b/vendor/base16ct/src/mixed.rs
new file mode 100644
index 000000000..50f778d80
--- /dev/null
+++ b/vendor/base16ct/src/mixed.rs
@@ -0,0 +1,38 @@
+use crate::{decode_inner, Error};
+#[cfg(feature = "alloc")]
+use crate::{decoded_len, Vec};
+
+/// Decode a mixed Base16 (hex) string into the provided destination buffer.
+pub fn decode(src: impl AsRef<[u8]>, dst: &mut [u8]) -> Result<&[u8], Error> {
+    decode_inner(src.as_ref(), dst, decode_nibble)
+}
+
+/// Decode a mixed Base16 (hex) string into a byte vector.
+#[cfg(feature = "alloc")]
+#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
+pub fn decode_vec(input: impl AsRef<[u8]>) -> Result<Vec<u8>, Error> {
+    let mut output = vec![0u8; decoded_len(input.as_ref())?];
+    decode(input, &mut output)?;
+    Ok(output)
+}
+
+/// Decode a single nibble of lower hex
+#[inline(always)]
+fn decode_nibble(src: u8) -> u16 {
+    // 0-9  0x30-0x39
+    // A-F  0x41-0x46 or a-f  0x61-0x66
+    let byte = src as i16;
+    let mut ret: i16 = -1;
+
+    // 0-9  0x30-0x39
+    // if (byte > 0x2f && byte < 0x3a) ret += byte - 0x30 + 1; // -47
+    ret += (((0x2fi16 - byte) & (byte - 0x3a)) >> 8) & (byte - 47);
+    // A-F  0x41-0x46
+    // if (byte > 0x40 && byte < 0x47) ret += byte - 0x41 + 10 + 1; // -54
+    ret += (((0x40i16 - byte) & (byte - 0x47)) >> 8) & (byte - 54);
+    // a-f  0x61-0x66
+    // if (byte > 0x60 && byte < 0x67) ret += byte - 0x61 + 10 + 1; // -86
+    ret += (((0x60i16 - byte) & (byte - 0x67)) >> 8) & (byte - 86);
+
+    ret as u16
+}