gix-bitmap-0.2.13/.cargo_vcs_info.json0000644000000001500000000000100131540ustar { "git": { "sha1": "4000197ecc8cf1a5d79361620e4c114f86476703" }, "path_in_vcs": "gix-bitmap" }gix-bitmap-0.2.13/Cargo.toml0000644000000061070000000000100111620ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g., crates.io) dependencies. # # If you are reading this file be aware that the original Cargo.toml # will likely look very different (and much more reasonable). # See Cargo.toml.orig for the original contents. [package] edition = "2021" rust-version = "1.65" name = "gix-bitmap" version = "0.2.13" authors = ["Sebastian Thiel "] build = false exclude = ["CHANGELOG.md"] autobins = false autoexamples = false autotests = false autobenches = false description = "A crate of the gitoxide project dedicated implementing the standard git bitmap format" readme = false license = "MIT OR Apache-2.0" repository = "https://github.com/GitoxideLabs/gitoxide" [lib] name = "gix_bitmap" path = "src/lib.rs" test = true doctest = false [dependencies.thiserror] version = "2.0.0" [dev-dependencies] [lints.clippy] bool_to_int_with_if = "allow" borrow_as_ptr = "allow" cast_lossless = "allow" cast_possible_truncation = "allow" cast_possible_wrap = "allow" cast_precision_loss = "allow" cast_sign_loss = "allow" checked_conversions = "allow" copy_iterator = "allow" default_trait_access = "allow" doc_markdown = "allow" empty_docs = "allow" enum_glob_use = "allow" explicit_deref_methods = "allow" explicit_into_iter_loop = "allow" explicit_iter_loop = "allow" filter_map_next = "allow" fn_params_excessive_bools = "allow" from_iter_instead_of_collect = "allow" if_not_else = "allow" ignored_unit_patterns = "allow" implicit_clone = "allow" inconsistent_struct_constructor = "allow" inefficient_to_string = "allow" inline_always = "allow" items_after_statements = "allow" iter_not_returning_iterator = "allow" iter_without_into_iter = "allow" manual_assert = "allow" manual_is_variant_and = "allow" manual_let_else = "allow" manual_string_new = "allow" many_single_char_names = "allow" match_bool = "allow" match_same_arms = "allow" match_wild_err_arm = "allow" match_wildcard_for_single_variants = "allow" missing_errors_doc = "allow" missing_panics_doc = "allow" module_name_repetitions = "allow" must_use_candidate = "allow" mut_mut = "allow" naive_bytecount = "allow" needless_for_each = "allow" needless_pass_by_value = "allow" needless_raw_string_hashes = "allow" no_effect_underscore_binding = "allow" option_option = "allow" range_plus_one = "allow" redundant_else = "allow" return_self_not_must_use = "allow" should_panic_without_expect = "allow" similar_names = "allow" single_match_else = "allow" stable_sort_primitive = "allow" struct_excessive_bools = "allow" struct_field_names = "allow" too_long_first_doc_paragraph = "allow" too_many_lines = "allow" transmute_ptr_to_ptr = "allow" trivially_copy_pass_by_ref = "allow" unnecessary_join = "allow" unnecessary_wraps = "allow" unreadable_literal = "allow" unused_self = "allow" used_underscore_binding = "allow" wildcard_imports = "allow" [lints.clippy.pedantic] level = "warn" priority = -1 [lints.rust] gix-bitmap-0.2.13/Cargo.toml.orig000064400000000000000000000010111046102023000146300ustar 00000000000000lints.workspace = true [package] name = "gix-bitmap" version = "0.2.13" repository = "https://github.com/GitoxideLabs/gitoxide" license = "MIT OR Apache-2.0" description = "A crate of the gitoxide project dedicated implementing the standard git bitmap format" authors = ["Sebastian Thiel "] edition = "2021" rust-version = "1.65" exclude = ["CHANGELOG.md"] [lib] doctest = false test = true [dependencies] thiserror = "2.0.0" [dev-dependencies] gix-testtools = { path = "../tests/tools" } gix-bitmap-0.2.13/LICENSE-APACHE000064400000000000000000000247461046102023000137110ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. gix-bitmap-0.2.13/LICENSE-MIT000064400000000000000000000017771046102023000134200ustar 00000000000000Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. gix-bitmap-0.2.13/src/ewah.rs000064400000000000000000000077671046102023000140520ustar 00000000000000/// pub mod decode { /// The error returned by [`decode()`][super::decode()]. #[derive(Debug, thiserror::Error)] #[allow(missing_docs)] pub enum Error { #[error("{}", message)] Corrupt { message: &'static str }, } } /// Decode `data` as EWAH bitmap. pub fn decode(data: &[u8]) -> Result<(Vec, &[u8]), decode::Error> { use self::decode::Error; use crate::decode; let (num_bits, data) = decode::u32(data).ok_or(Error::Corrupt { message: "eof reading amount of bits", })?; let (len, data) = decode::u32(data).ok_or(Error::Corrupt { message: "eof reading chunk length", })?; let len = len as usize; // NOTE: git does this by copying all bytes first, and then it will change the endianness in a separate loop. // Maybe it's faster, but we can't do it without unsafe. Let's leave it to the optimizer and maybe // one day somebody will find out that it's worth it to use unsafe here. let (mut bits, data) = decode::split_at_pos(data, len * std::mem::size_of::()).ok_or(Error::Corrupt { message: "eof while reading bit data", })?; let mut buf = std::vec::Vec::::with_capacity(len); for _ in 0..len { let (bit_num, rest) = bits.split_at(std::mem::size_of::()); bits = rest; buf.push(u64::from_be_bytes(bit_num.try_into().unwrap())); } let (rlw, data) = decode::u32(data).ok_or(Error::Corrupt { message: "eof while reading run length width", })?; Ok(( Vec { num_bits, bits: buf, rlw: rlw.into(), }, data, )) } mod access { use super::Vec; impl Vec { /// Call `f(index)` for each bit that is true, given the index of the bit that identifies it uniquely within the bit array. /// If `f` returns `None` the iteration will be stopped and `None` is returned. /// /// The index is sequential like in any other vector. pub fn for_each_set_bit(&self, mut f: impl FnMut(usize) -> Option<()>) -> Option<()> { let mut index = 0usize; let mut iter = self.bits.iter(); while let Some(word) = iter.next() { if rlw_runbit_is_set(word) { let len = rlw_running_len_bits(word); for _ in 0..len { f(index)?; index += 1; } } else { index += usize::try_from(rlw_running_len_bits(word)).ok()?; } for _ in 0..rlw_literal_words(word) { let word = iter .next() .expect("BUG: ran out of words while going through uncompressed portion"); for bit_index in 0..64 { if word & (1 << bit_index) != 0 { f(index)?; } index += 1; } } } Some(()) } /// The amount of bits we are currently holding. pub fn num_bits(&self) -> usize { self.num_bits.try_into().expect("we are not on 16 bit systems") } } #[inline] fn rlw_running_len_bits(w: &u64) -> u64 { rlw_running_len(w) * 64 } #[inline] fn rlw_running_len(w: &u64) -> u64 { (w >> 1) & RLW_LARGEST_RUNNING_COUNT } #[inline] fn rlw_literal_words(w: &u64) -> u64 { w >> (1 + RLW_RUNNING_BITS) } #[inline] fn rlw_runbit_is_set(w: &u64) -> bool { w & 1 == 1 } const RLW_RUNNING_BITS: u64 = 4 * 8; const RLW_LARGEST_RUNNING_COUNT: u64 = (1 << RLW_RUNNING_BITS) - 1; } /// A growable collection of u64 that are seen as stream of individual bits. #[allow(dead_code)] #[derive(Clone)] pub struct Vec { num_bits: u32, bits: std::vec::Vec, /// RLW is an offset into the `bits` buffer, so `1` translates into &bits\[1] essentially. rlw: u64, } gix-bitmap-0.2.13/src/lib.rs000064400000000000000000000013661046102023000136610ustar 00000000000000//! An implementation of the shared parts of git bitmaps used in `gix-pack`, `gix-index` and `gix-worktree`. //! //! Note that many tests are performed indirectly by tests in the aforementioned consumer crates. #![deny(rust_2018_idioms, unsafe_code, missing_docs)] /// Bitmap utilities for the advanced word-aligned hybrid bitmap pub mod ewah; pub(crate) mod decode { #[inline] pub(crate) fn split_at_pos(data: &[u8], pos: usize) -> Option<(&[u8], &[u8])> { if data.len() < pos { return None; } data.split_at(pos).into() } #[inline] pub(crate) fn u32(data: &[u8]) -> Option<(u32, &[u8])> { split_at_pos(data, 4).map(|(num, data)| (u32::from_be_bytes(num.try_into().unwrap()), data)) } }