From bf21ebaaae44b267cfefc87eee9608c09aab96b7 Mon Sep 17 00:00:00 2001
From: Will Dillon <william@housedillon.com>
Date: Thu, 4 Dec 2025 17:07:12 +0000
Subject: Getting closer to no-std being done

---
 src/string_helper.rs | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/string_helper.rs

(limited to 'src/string_helper.rs')

diff --git a/src/string_helper.rs b/src/string_helper.rs
new file mode 100644
index 0000000..e5af42b
--- /dev/null
+++ b/src/string_helper.rs
@@ -0,0 +1,70 @@
+#[cfg(not(feature = "std"))]
+use arraystring::{ArrayString, typenum::{U32, U160}};
+
+#[cfg(feature = "std")]
+pub(crate) type NameString = String;
+
+#[cfg(feature = "std")]
+pub(crate) fn name_string_from_slice(s: &[u8]) -> NameString {
+    match String::from_utf8(s.to_vec()) {
+        Ok(s) => s,
+        Err(_) => "Unable to create string".to_string()
+    }
+}
+
+#[cfg(not(feature = "std"))]
+pub(crate) type NameString = ArrayString<U32>;
+
+#[cfg(not(feature = "std"))]
+pub(crate) fn name_string_from_slice(s: &[u8]) -> NameString {
+    NameString::from_str_truncate(s)
+}
+
+#[cfg(feature = "std")]
+pub(crate) type MessageString = String;
+
+#[cfg(not(feature = "std"))]
+pub(crate) type MessageString = ArrayString<U160>;
+
+#[cfg(feature = "std")]
+pub(crate) fn message_string_from_slice(s: &[u8]) -> MessageString {
+    let mut split = s.split(|c| *c == 0);
+
+    if let Some(s) = split.next() {
+        match String::from_utf8(s.to_vec()) {
+            Ok(s) => {
+                s.trim().to_string()
+            }
+            Err(_) => "Unable to create string".to_string()
+        }
+    } else {
+        "".to_string()
+    }
+}
+
+#[cfg(not(feature = "std"))]
+pub(crate) fn message_string_from_slice(s: &[u8]) -> MessageString {
+    MessageString::from_str_truncate(s)
+}
+
+#[cfg(feature = "std")]
+pub(crate) type PasswordString = String;
+
+// I believe that a password can only be 141 characters,
+// but given it's close enough to 160, let's just round
+// up so it's the same as MessageString.
+#[cfg(not(feature = "std"))]
+pub(crate) type PasswordString = ArrayString<U160>;
+
+#[cfg(feature = "std")]
+pub(crate) fn password_string_from_slice(s: &[u8]) -> PasswordString {
+    match String::from_utf8(s.to_vec()) {
+        Ok(s) => s,
+        Err(_) => "".to_string()
+    }
+}
+
+#[cfg(not(feature = "std"))]
+pub(crate) fn password_string_from_slice(s: &[u8]) -> PasswordString {
+    PasswordString::from_str_truncate(s)
+}
-- 
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