Add shared lib

backend/sync_lib/src/lib.rs

@@ -0,0 +1,25 @@
+use base64::{Engine as _, engine::general_purpose::STANDARD_NO_PAD};
+use errors::SyncLibError;
+
+pub mod errors;
+
+pub fn bytes_to_base64(input: &[u8]) -> String {
+    STANDARD_NO_PAD.encode(input)
+}
+
+pub fn string_to_base64(input: &str) -> String {
+    bytes_to_base64(input.as_bytes())
+}
+
+pub fn base64_to_bytes(input: &str) -> Result<Vec<u8>, SyncLibError> {
+    STANDARD_NO_PAD.decode(input).map_err(SyncLibError::from)
+}
+
+pub fn base64_to_string(input: &str) -> Result<String, SyncLibError> {
+    let bytes = base64_to_bytes(input)?;
+    String::from_utf8(bytes).map_err(SyncLibError::from)
+}
+
+pub fn is_binary(data: &[u8]) -> bool {
+    data.iter().any(|&b| b == 0)
+}