bit_reverse.rs.html -- source

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adler32

aho_corasick

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phf_shared

ppv_lite86

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proc_macro2

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quick_error

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rand

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rand_core

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rand_distr

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rawpointer

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ser

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smallvec

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tiny_http

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twoway

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unicase

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unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

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url

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void

xml

xml_rpc

xmlfmt

de.rs error.rs mod.rs parse.rs ser.rs value.rs

client.rs error.rs lib.rs server.rs

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

/// Reverse the first length bits of n.
/// (Passing more than 16 as length will produce garbage.
pub fn reverse_bits(mut n: u16, length: u8) -> u16 {
    debug_assert!(length <= 16);
    // Borrowed from http://aggregate.org/MAGIC/#Bit%20Reversal
    n = ((n & 0xaaaa) >> 1) | ((n & 0x5555) << 1);
    n = ((n & 0xcccc) >> 2) | ((n & 0x3333) << 2);
    n = ((n & 0xf0f0) >> 4) | ((n & 0x0f0f) << 4);
    n = ((n & 0xff00) >> 8) | ((n & 0x00ff) << 8);
    n >> (16 - length)
}

#[cfg(test)]
mod test {
    use super::reverse_bits;
    #[test]
    fn test_bit_reverse() {
        assert_eq!(reverse_bits(0b0111_0100, 8), 0b0010_1110);
        assert_eq!(
            reverse_bits(0b1100_1100_1100_1100, 16),
            0b0011_0011_0011_0011
        );
        // Check that we ignore >16 length
        // We no longer check for this.
        // assert_eq!(reverse_bits(0b11001100_11001100, 32), 0b0011001100110011);
    }
}

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