Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "const-crc32"
-version = "1.3.0"
+version = "1.2.0"
 edition = "2021"
 authors = ["Jonathan Strong <jstrong@shipyard.rs>"]
 license = "MIT"

src/lib.rs

@@ -10,7 +10,6 @@
 
 /// used to generate up a [u32; 256] lookup table in `crc32`. this computes
 /// the table on demand for a given "index" `i`
-#[rustfmt::skip]
 const fn table_fn(i: u32) -> u32 {
     let mut out = i;
 
@@ -49,40 +48,6 @@ pub const fn crc32(buf: &[u8]) -> u32 {
     crc32_seed(buf, 0)
 }
 
-/// Calculate crc32 checksum, using provided `seed` as the initial state, instead of the
-/// default initial state of `0u32`.
-///
-/// # Examples
-///
-/// Calculating the checksum from several parts of a larger input:
-///
-/// ```
-/// const BYTES: &[u8] = "The quick brown fox jumps over the lazy dog".as_bytes();
-///
-/// let mut cksum = 0u32;
-///
-/// cksum = const_crc32::crc32_seed(&BYTES[0..10], cksum);
-/// cksum = const_crc32::crc32_seed(&BYTES[10..15], cksum);
-/// cksum = const_crc32::crc32_seed(&BYTES[15..], cksum);
-///
-/// assert_eq!(cksum, const_crc32::crc32(BYTES));
-/// ```
-///
-/// Using separate seeds for different kinds of data, to produce different checksums depending
-/// on what kind of data the bytes represent:
-///
-/// ```
-/// const THING_ONE_SEED: u32 = 0xbaaaaaad_u32;
-/// const THING_TWO_SEED: u32 = 0x2bad2bad_u32;
-///
-/// let thing_one_bytes = "bump! thump!".as_bytes();
-/// let thing_two_bytes = "thump! bump!".as_bytes();
-///
-/// let thing_one_cksum = const_crc32::crc32_seed(thing_one_bytes, THING_ONE_SEED);
-/// let thing_two_cksum = const_crc32::crc32_seed(thing_two_bytes, THING_TWO_SEED);
-///
-/// assert_ne!(thing_one_cksum, thing_two_cksum);
-/// ```
 #[inline]
 pub const fn crc32_seed(buf: &[u8], seed: u32) -> u32 {
     let mut out = !seed;
@@ -102,10 +67,12 @@ mod tests {
     fn crc32_compute_table() -> [u32; 256] {
         let mut crc32_table = [0; 256];
 
-        for n in 0..256_u32 {
-            crc32_table[n as usize] = (0..8).fold(n, |acc, _| match acc & 1 {
+        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,
+                }
             });
         }
 
@@ -127,28 +94,6 @@ mod tests {
         assert_eq!(crc32(BYTES), crc32fast::hash(BYTES));
     }
 
-    #[test]
-    fn use_seed_to_checksum_from_partial_inputs() {
-        const BYTES: &[u8] = "The quick brown fox jumps over the lazy dog".as_bytes();
-        let mut cksum = crc32(&BYTES[0..10]);
-        cksum = crc32_seed(&BYTES[10..], cksum);
-        assert_eq!(cksum, crc32(BYTES));
-    }
-
-    #[test]
-    fn use_seed_to_checksum_from_many_chunks() {
-        let mut buf = [0u8; 1024];
-        let mut rng = thread_rng();
-        rng.fill(&mut buf[..]);
-
-        let mut cksum = 0;
-        for chunk in buf[..].chunks(7) {
-            cksum = crc32_seed(chunk, cksum);
-        }
-
-        assert_eq!(cksum, crc32(&buf[..]));
-    }
-
     #[test]
     fn check_random_inputs_against_crc32_fast() {
         const N_ITER: usize = 100;