1 files changed, 30 insertions, 0 deletions
diff --git a/server/src/util.rs b/server/src/util.rs
new file mode 100644
index 0000000..6a0d8d9
--- /dev/null
+++ b/server/src/util.rs
@@ -0,0 +1,30 @@
+pub fn base64_encode(bytes: &[u8]) -> String {
+    const ALPHABET: &[u8; 64] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+    let len = (bytes.len() + 2) / 3 * 4;
+    let mut dest = Vec::with_capacity(len);
+    dest.resize(len, 0u8);
+    for i in 0 .. bytes.len() / 3 {
+        dest[4 * i + 0] = ALPHABET[(bytes[3 * i + 0] & 0x3f) as usize];
+        dest[4 * i + 1] = ALPHABET[(((bytes[3 * i + 0] & 0xc0) >> 6) | ((bytes[3 * i + 1] & 0x0f) << 2)) as usize];
+        dest[4 * i + 2] = ALPHABET[(((bytes[3 * i + 1] & 0xf0) >> 4) | ((bytes[3 * i + 2] & 0x03) << 4)) as usize];
+        dest[4 * i + 3] = ALPHABET[((bytes[3 * i + 1] & 0xfc) >> 2) as usize];
+    }
+    let last = bytes.len() / 3;
+    match bytes.len() % 3 {
+        1 => {
+            dest[4 * last + 0] = ALPHABET[(bytes[3 * last + 0] & 0x3f) as usize];
+            dest[4 * last + 1] = ALPHABET[((bytes[3 * last + 0] & 0xc0) >> 6) as usize];
+            dest[4 * last + 2] = b'=';
+            dest[4 * last + 3] = b'=';
+        }
+        2 => {
+            dest[4 * last + 0] = ALPHABET[(bytes[3 * last + 0] & 0x3f) as usize];
+            dest[4 * last + 1] = ALPHABET[(((bytes[3 * last + 0] & 0xc0) >> 6) | ((bytes[3 * last + 1] & 0x0f) << 2)) as usize];
+            dest[4 * last + 2] = ALPHABET[((bytes[3 * last + 1] & 0xf0) >> 4) as usize];
+            dest[4 * last + 3] = b'=';
+        }
+        _0 => {}
+    }
+    String::from_utf8(dest).unwrap()
+}