fix(users): rename zseri -> fogti r/6396

in accordnace with similar renaming on other sites
(e.g. GitHub, Exozyme, chaos.social)

My experience with exozyme tells me that fully applying
this change might require manual editing of gerrits database
anyways to fix broken references/patch ownerships.

Change-Id: I024ff264c09b25d8f854c489d93458d1fce7e9f4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8919
Autosubmit: lukegb <lukegb@tvl.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: zseri <zseri.devel@ytrizja.de>

1 files changed, 167 insertions, 0 deletions

diff --git a/users/fogti/store-ref-scanner/src/hbm.rs b/users/fogti/store-ref-scanner/src/hbm.rs
new file mode 100644
index 000000000000..2520efd8363d
--- /dev/null
+++ b/users/fogti/store-ref-scanner/src/hbm.rs
@@ -0,0 +1,167 @@
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub struct HalfBytesMask(pub [u8; 16]);
+
+#[allow(clippy::as_conversions, clippy::zero_prefixed_literal)]
+impl HalfBytesMask {
+    pub const B32_REVSHA256: HalfBytesMask =
+        HalfBytesMask([0, 0, 0, 0, 0, 0, 255, 3, 0, 0, 0, 0, 222, 127, 207, 7]);
+
+    pub const B64_BLAKE2B256: HalfBytesMask = HalfBytesMask([
+        0, 0, 0, 0, 0, 8, 255, 3, 254, 255, 255, 135, 254, 255, 255, 7,
+    ]);
+
+    pub const DFL_REST: HalfBytesMask = HalfBytesMask([
+        0, 0, 0, 0, 0, 104, 255, 163, 254, 255, 255, 135, 254, 255, 255, 7,
+    ]);
+
+    #[inline]
+    pub const fn from_expanded(x: [bool; 128]) -> Self {
+        let mut ret = [0u8; 16];
+        let mut idx = 0;
+        while idx < 16 {
+            let fin = idx * 8;
+            let mut idx2 = 0;
+            while idx2 < 8 {
+                if x[fin + idx2] {
+                    ret[idx] += (1 << idx2) as u8;
+                }
+                idx2 += 1;
+            }
+            idx += 1;
+        }
+        Self(ret)
+    }
+
+    /// create a mask by allowing all characters via the mask which are included in the given string
+    pub fn from_bytes(s: &[u8]) -> Self {
+        s.iter().fold(Self([0u8; 16]), |mut ret, &i| {
+            ret.set(i, true);
+            ret
+        })
+    }
+
+    pub const fn into_expanded(self) -> [bool; 128] {
+        let Self(ihbm) = self;
+        let mut ret = [false; 128];
+        let mut idx = 0;
+        while idx < 16 {
+            let fin = idx * 8;
+            let curi = ihbm[idx];
+            let mut idx2 = 0;
+            while idx2 < 8 {
+                ret[fin + idx2] = (curi >> idx2) & 0b1 != 0;
+                idx2 += 1;
+            }
+            idx += 1;
+        }
+        ret
+    }
+
+    pub fn contains(&self, byte: u8) -> bool {
+        if byte >= 0x80 {
+            false
+        } else {
+            (self.0[usize::from(byte / 8)] >> u32::from(byte % 8)) & 0b1 != 0
+        }
+    }
+
+    pub fn set(&mut self, byte: u8, allow: bool) {
+        if byte >= 0x80 {
+            if cfg!(debug_assertions) {
+                panic!(
+                    "tried to manipulate invalid byte {:?} in HalfBytesMask",
+                    byte
+                );
+            } else {
+                return;
+            }
+        }
+        let block = &mut self.0[usize::from(byte / 8)];
+        let bitpat = (1 << u32::from(byte % 8)) as u8;
+        if allow {
+            *block |= bitpat;
+        } else {
+            *block &= !bitpat;
+        }
+    }
+
+    #[cfg(test)]
+    fn count_ones(&self) -> u8 {
+        self.0
+            .iter()
+            .map(|i| i.count_ones())
+            .sum::<u32>()
+            .try_into()
+            .unwrap()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn maskbase() {
+        assert_eq!(HalfBytesMask::B32_REVSHA256.count_ones(), 32);
+        assert_eq!(HalfBytesMask::B64_BLAKE2B256.count_ones(), 64);
+    }
+
+    #[test]
+    fn non_ascii() {
+        for i in 0x80..=0xff {
+            assert!(!HalfBytesMask::DFL_REST.contains(i));
+        }
+    }
+
+    #[test]
+    fn dflmask() {
+        assert_eq!(
+            HalfBytesMask::from_expanded(
+                [
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                ]
+                .map(|i| i != 0)
+            ),
+            Default::default(),
+        );
+
+        assert_eq!(
+            HalfBytesMask::from_expanded(
+                [
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
+                    1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1,
+                    1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
+                ]
+                .map(|i| i != 0)
+            ),
+            HalfBytesMask::B32_REVSHA256,
+        );
+
+        assert_eq!(
+            HalfBytesMask::from_expanded(
+                [
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1,
+                    1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1,
+                    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
+                ]
+                .map(|i| i != 0)
+            ),
+            HalfBytesMask::B64_BLAKE2B256,
+        );
+
+        assert_eq!(
+            HalfBytesMask::from_bytes(
+                b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-._?="
+            ),
+            HalfBytesMask::DFL_REST,
+        );
+    }
+}