stage

common/src/lib.rs

@@ -0,0 +1,51 @@
+use anyhow::{Result, anyhow};
+
+pub fn is_valid_english(input_str: &str, ratio: Option<f32>) -> bool {
+    let ratio = ratio.unwrap_or(0.6);
+    let mut total_chars = 0;
+    let mut alphabet_chars = 0;
+    let mut prev_char = None;
+    for c in input_str.chars() {
+        // 检查连续空格
+        if c == ' ' && prev_char == Some(' ') {
+            return false;
+        }
+
+        // 检查是否为可打印字符
+        if !(c.is_ascii_lowercase()
+            || c.is_ascii_uppercase()
+            || c.is_ascii_digit()
+            || " .,!?;:'\"-()".contains(c))
+        {
+            return false;
+        }
+
+        // 检查是否为换行符
+        if c == '\n' {
+            return false;
+        }
+        total_chars += 1;
+        if c.is_alphabetic() {
+            alphabet_chars += 1;
+        }
+        prev_char = Some(c);
+    }
+    // 字符占文本的比例
+    let alphabet_ratio = alphabet_chars as f32 / total_chars as f32;
+    if alphabet_ratio < ratio {
+        return false;
+    }
+
+    true
+}
+
+pub fn xor_with_key(input: &[u8], key: &[u8]) -> Result<Vec<u8>> {
+    if key.is_empty() {
+        return Err(anyhow!("empty key"));
+    }
+    Ok(input
+        .iter()
+        .zip(key.iter().cycle())
+        .map(|(&a, &b)| a ^ b)
+        .collect())
+}