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comparison rust/hg-core/src/revlog/patch.rs @ 52761:8497cfb0d76c

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rust-manifest: add Manifestlog::inexact_data_delta_parents This is similar to manifestctx.read_delta_parents(exact=False) in manifest.py. It is useful to determine if a file was added in a changeset without delta-resolving the entire manifest. I will use it for rhg annotate.
author Mitchell Kember <mkember@janestreet.com>
date Tue, 14 Jan 2025 17:44:02 -0500
parents bd8081e9fd62
children
comparison
equal deleted inserted replaced
52760:94e2547e6f3d 52761:8497cfb0d76c
10 /// - an insertion when `!data.is_empty() && start == end` 10 /// - an insertion when `!data.is_empty() && start == end`
11 /// - an deletion when `data.is_empty() && start < end` 11 /// - an deletion when `data.is_empty() && start < end`
12 /// - a replacement when `!data.is_empty() && start < end` 12 /// - a replacement when `!data.is_empty() && start < end`
13 /// - not doing anything when `data.is_empty() && start == end` 13 /// - not doing anything when `data.is_empty() && start == end`
14 #[derive(Debug, Clone)] 14 #[derive(Debug, Clone)]
15 struct Chunk<'a> { 15 pub(crate) struct Chunk<'a> {
16 /// The start position of the chunk of data to replace 16 /// The start position of the chunk of data to replace
17 start: u32, 17 pub(crate) start: u32,
18 /// The end position of the chunk of data to replace (open end interval) 18 /// The end position of the chunk of data to replace (open end interval)
19 end: u32, 19 pub(crate) end: u32,
20 /// The data replacing the chunk 20 /// The data replacing the chunk
21 data: &'a [u8], 21 pub(crate) data: &'a [u8],
22 } 22 }
23 23
24 impl Chunk<'_> { 24 impl Chunk<'_> {
25 /// Adjusted start of the chunk to replace. 25 /// Adjusted start of the chunk to replace.
26 /// 26 ///
58 /// 58 ///
59 /// Those chunks are: 59 /// Those chunks are:
60 /// - ordered from the left-most replacement to the right-most replacement 60 /// - ordered from the left-most replacement to the right-most replacement
61 /// - non-overlapping, meaning that two chucks can not change the same 61 /// - non-overlapping, meaning that two chucks can not change the same
62 /// chunk of the patched data 62 /// chunk of the patched data
63 chunks: Vec<Chunk<'a>>, 63 pub(crate) chunks: Vec<Chunk<'a>>,
64 } 64 }
65 65
66 impl<'a> PatchList<'a> { 66 impl<'a> PatchList<'a> {
67 /// Create a `PatchList` from bytes. 67 /// Create a `PatchList` from bytes.
68 pub fn new(data: &'a [u8]) -> Result<Self, RevlogError> { 68 pub fn new(data: &'a [u8]) -> Result<Self, RevlogError> {
81 data: &data[12..12 + (len as usize)], 81 data: &data[12..12 + (len as usize)],
82 }); 82 });
83 data = &data[12 + (len as usize)..]; 83 data = &data[12 + (len as usize)..];
84 } 84 }
85 Ok(PatchList { chunks }) 85 Ok(PatchList { chunks })
86 }
87
88 /// Creates a patch for a full snapshot, going from nothing to `data`.
89 pub fn full_snapshot(data: &'a [u8]) -> Self {
90 Self {
91 chunks: vec![Chunk {
92 start: 0,
93 end: 0,
94 data,
95 }],
96 }
86 } 97 }
87 98
88 /// Apply the patch to some data. 99 /// Apply the patch to some data.
89 pub fn apply<T>( 100 pub fn apply<T>(
90 &self, 101 &self,