feat: 初始化增加rust查询

binding/rust/Cargo.toml

+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

binding/rust/src/lib.rs

+use std::fs::File;
+use std::net::{IpAddr, Ipv4Addr};
+use std::io::{Read, Bytes};
+
+fn main() {}
+
+const HEADER_INFO_LENGTH: u32 = 256;
+const VECTOR_INDEX_ROWS: u32 = 256;
+const VECTOR_INDEX_COLS: u32 = 256;
+const VECTOR_INDEX_SIZE: u32 = 8;
+const SEGMENT_INDEX_SIZE: usize = 14;
+
+pub struct Searcher {
+    pub buffer: Vec<u8>,
+}
+
+impl Searcher {
+    pub fn new(filepath: &'static str) -> Result<Self, Box<dyn std::error::Error>> {
+        let mut f = File::open(filepath)?;
+        let mut buffer = Vec::new();
+        f.read_to_end(&mut buffer)?;
+        Ok(Self { buffer })
+    }
+
+    pub fn search_by_ip(&self, ip: &'static str) -> Result<String, Box<dyn std::error::Error>> {
+        let ip = ip.parse::<Ipv4Addr>().unwrap_or_else(|_| {
+            let ip = ip.parse::<u32>().expect("ip is not a valid ip or valid int");
+            Ipv4Addr::from(ip)
+        });
+        println!("{:?}", ip);
+
+        let ip = u32::from(ip);
+        let il0 = (ip >> 24) & 0xFF;
+        let il1 = (ip >> 16) & 0xFF;
+        let idx = VECTOR_INDEX_SIZE * (il0 * VECTOR_INDEX_SIZE * VECTOR_INDEX_COLS + il1);
+
+        let start_ptr = get_u32(&self.buffer, (HEADER_INFO_LENGTH + idx) as usize);
+        let end_ptr = get_u32(&self.buffer, (HEADER_INFO_LENGTH + idx+4) as usize);
+
+        let mut left: usize= 0;
+        let mut right: usize = ((end_ptr - start_ptr) as usize )/SEGMENT_INDEX_SIZE;
+        while left < right {
+            let mid = (left + right) >> 1;
+            let offset = start_ptr as usize + mid * SEGMENT_INDEX_SIZE;
+            let buffer_ip_value = self.buffer_value(offset, SEGMENT_INDEX_SIZE);
+            let start_ip = get_u32(buffer_ip_value, 0);
+            if ip < start_ip {
+                right = mid - 1;
+            } else if ip > get_u32(buffer_ip_value, 4) {
+                left = mid + 1;
+            } else {
+                let length = (self.buffer[offset] as usize & 0x000000FF) | (self.buffer[offset + 1] as usize & 0x0000FF00);
+                let offset = get_u32(&self.buffer, 10);
+                let result = self.buffer_value(offset as usize, length as usize).iter().map(|x| x.to_owned()).collect::<Vec<u8>>();
+                return Ok(String::from_utf8(result)?);
+            }
+        }
+        Err("not matched".into())
+
+    }
+
+    pub fn buffer_value(&self, offset: usize, length: usize) -> &[u8] {
+        &self.buffer[offset..offset+length]
+    }
+}
+
+fn get_u32(bytes: &[u8], offset: usize) -> u32 {
+    let offset = offset as usize;
+    let tmp = (bytes[offset] as i64) & 0x000000FF
+        | ((bytes[offset + 1] as i64) << 8) & 0x0000FF00
+        | ((bytes[offset + 2] as i64) << 16) & 0x00FF0000
+        | ((bytes[offset + 3] as i64) << 24) & 0xFF000000;
+    tmp as u32
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_search_by_ip() {
+        let filepath = "../../data/ip2region.xdb";
+        let searcher = Searcher::new(filepath).expect("load file error");
+        let result = searcher.search_by_ip("1.0.0.0");
+        println!("{:?}", result);
+
+    }
+}
\ No newline at end of file

binding/rust/src/main.rs

+mod lib;
+
+fn main() {
+    println!("Hello, world!");
+}