Data commit

Task/CRC-32/Rust/crc-32.rust

@@ -0,0 +1,26 @@
+fn crc32_compute_table() -> [u32; 256] {
+    let mut crc32_table = [0; 256];
+
+    for n in 0..256 {
+        crc32_table[n as usize] = (0..8).fold(n as u32, |acc, _| {
+            match acc & 1 {
+                1 => 0xedb88320 ^ (acc >> 1),
+                _ => acc >> 1,
+            }
+        });
+    }
+
+    crc32_table
+}
+
+fn crc32(buf: &str) -> u32 {
+    let crc_table = crc32_compute_table();
+
+    !buf.bytes().fold(!0, |acc, octet| {
+        (acc >> 8) ^ crc_table[((acc & 0xff) ^ octet as u32) as usize]
+    })
+}
+
+fn main() {
+    println!("{:x}", crc32("The quick brown fox jumps over the lazy dog"));
+}