rustfmt
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@ -10,6 +10,7 @@
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/// used to generate up a [u32; 256] lookup table in `crc32`. this computes
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/// used to generate up a [u32; 256] lookup table in `crc32`. this computes
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/// the table on demand for a given "index" `i`
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/// the table on demand for a given "index" `i`
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#[rustfmt::skip]
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const fn table_fn(i: u32) -> u32 {
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const fn table_fn(i: u32) -> u32 {
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let mut out = i;
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let mut out = i;
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@ -101,12 +102,10 @@ mod tests {
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fn crc32_compute_table() -> [u32; 256] {
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fn crc32_compute_table() -> [u32; 256] {
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let mut crc32_table = [0; 256];
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let mut crc32_table = [0; 256];
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for n in 0..256 {
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for n in 0..256_u32 {
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crc32_table[n as usize] = (0..8).fold(n as u32, |acc, _| {
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crc32_table[n as usize] = (0..8).fold(n, |acc, _| match acc & 1 {
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match acc & 1 {
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1 => 0xedb88320 ^ (acc >> 1),
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1 => 0xedb88320 ^ (acc >> 1),
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_ => acc >> 1,
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_ => acc >> 1,
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}
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});
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});
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}
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}
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@ -116,7 +115,7 @@ mod tests {
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#[test]
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#[test]
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fn check_table_fn_against_example_code() {
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fn check_table_fn_against_example_code() {
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let table = crc32_compute_table();
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let table = crc32_compute_table();
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for i in 0..256{
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for i in 0..256 {
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assert_eq!(table[i], table_fn(i as u32));
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assert_eq!(table[i], table_fn(i as u32));
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}
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}
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}
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}
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