Initial commit.

[rapid-gossip-sync-server] / src / hex_utils.rs

diff --git a/src/hex_utils.rs b/src/hex_utils.rs
new file mode 100644 (file)
index 0000000..cab5a15
--- /dev/null
+++ b/src/hex_utils.rs
@@ -0,0 +1,42 @@
+use bitcoin::secp256k1::PublicKey;
+
+pub fn to_vec(hex: &str) -> Option<Vec<u8>> {
+    let mut out = Vec::with_capacity(hex.len() / 2);
+
+    let mut b = 0;
+    for (idx, c) in hex.as_bytes().iter().enumerate() {
+        b <<= 4;
+        match *c {
+            b'A'..=b'F' => b |= c - b'A' + 10,
+            b'a'..=b'f' => b |= c - b'a' + 10,
+            b'0'..=b'9' => b |= c - b'0',
+            _ => return None,
+        }
+        if (idx & 1) == 1 {
+            out.push(b);
+            b = 0;
+        }
+    }
+
+    Some(out)
+}
+
+#[inline]
+pub fn hex_str(value: &[u8]) -> String {
+    let mut res = String::with_capacity(64);
+    for v in value {
+        res += &format!("{:02x}", v);
+    }
+    res
+}
+
+pub fn to_compressed_pubkey(hex: &str) -> Option<PublicKey> {
+    let data = match to_vec(&hex[0..33 * 2]) {
+        Some(bytes) => bytes,
+        None => return None,
+    };
+    match PublicKey::from_slice(&data) {
+        Ok(pk) => Some(pk),
+        Err(_) => None,
+    }
+}