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annotate rust/hg-core/src/dirstate/parsers.rs @ 48674:f7086f6173f8 stable

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dirstate-v2: rename the configuration to enable the format The rename of the old experimental name was overlooked before the 6.0 release. We rename everything to use the new name (and keep the released name as an alias for compatibility). Differential Revision: https://phab.mercurial-scm.org/D12129
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 01 Feb 2022 16:36:20 +0100
parents 269ff8978086
children c7fb9b74e753
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 use crate::errors::HgError;
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7 use crate::utils::hg_path::HgPath;
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8 use crate::{dirstate::EntryState, DirstateEntry, DirstateParents};
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9 use byteorder::{BigEndian, WriteBytesExt};
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10 use bytes_cast::{unaligned, BytesCast};
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11 use micro_timer::timed;
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12 use std::convert::TryFrom;
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13
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14 /// Parents are stored in the dirstate as byte hashes.
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15 pub const PARENT_SIZE: usize = 20;
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16 /// Dirstate entries have a static part of 8 + 32 + 32 + 32 + 32 bits.
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17 const MIN_ENTRY_SIZE: usize = 17;
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18
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19 type ParseResult<'a> = (
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20 &'a DirstateParents,
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21 Vec<(&'a HgPath, DirstateEntry)>,
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22 Vec<(&'a HgPath, &'a HgPath)>,
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23 );
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24
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25 pub fn parse_dirstate_parents(
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26 contents: &[u8],
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27 ) -> Result<&DirstateParents, HgError> {
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28 let (parents, _rest) = DirstateParents::from_bytes(contents)
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29 .map_err(|_| HgError::corrupted("Too little data for dirstate."))?;
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30 Ok(parents)
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31 }
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32
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33 #[timed]
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34 pub fn parse_dirstate(contents: &[u8]) -> Result<ParseResult, HgError> {
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35 let mut copies = Vec::new();
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36 let mut entries = Vec::new();
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37 let parents =
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38 parse_dirstate_entries(contents, |path, entry, copy_source| {
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39 if let Some(source) = copy_source {
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40 copies.push((path, source));
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41 }
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42 entries.push((path, *entry));
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43 Ok(())
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44 })?;
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45 Ok((parents, entries, copies))
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46 }
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47
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48 #[derive(BytesCast)]
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49 #[repr(C)]
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50 struct RawEntry {
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51 state: u8,
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52 mode: unaligned::I32Be,
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53 size: unaligned::I32Be,
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54 mtime: unaligned::I32Be,
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55 length: unaligned::I32Be,
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56 }
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57
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58 pub fn parse_dirstate_entries<'a>(
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59 mut contents: &'a [u8],
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60 mut each_entry: impl FnMut(
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61 &'a HgPath,
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62 &DirstateEntry,
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63 Option<&'a HgPath>,
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64 ) -> Result<(), HgError>,
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65 ) -> Result<&'a DirstateParents, HgError> {
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66 let (parents, rest) = DirstateParents::from_bytes(contents)
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67 .map_err(|_| HgError::corrupted("Too little data for dirstate."))?;
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68 contents = rest;
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69 while !contents.is_empty() {
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70 let (raw_entry, rest) = RawEntry::from_bytes(contents)
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71 .map_err(|_| HgError::corrupted("Overflow in dirstate."))?;
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72
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73 let entry = DirstateEntry::from_v1_data(
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74 EntryState::try_from(raw_entry.state)?,
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75 raw_entry.mode.get(),
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76 raw_entry.size.get(),
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77 raw_entry.mtime.get(),
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78 );
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79 let (paths, rest) =
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80 u8::slice_from_bytes(rest, raw_entry.length.get() as usize)
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81 .map_err(|_| HgError::corrupted("Overflow in dirstate."))?;
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82
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83 // `paths` is either a single path, or two paths separated by a NULL
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84 // byte
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85 let mut iter = paths.splitn(2, |&byte| byte == b'\0');
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86 let path = HgPath::new(
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87 iter.next().expect("splitn always yields at least one item"),
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88 );
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89 let copy_source = iter.next().map(HgPath::new);
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90 each_entry(path, &entry, copy_source)?;
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91
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92 contents = rest;
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93 }
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94 Ok(parents)
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95 }
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96
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97 fn packed_filename_and_copy_source_size(
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98 filename: &HgPath,
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99 copy_source: Option<&HgPath>,
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100 ) -> usize {
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101 filename.len()
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102 + if let Some(source) = copy_source {
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103 b"\0".len() + source.len()
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104 } else {
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105 0
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106 }
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107 }
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108
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109 pub fn packed_entry_size(
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110 filename: &HgPath,
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111 copy_source: Option<&HgPath>,
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112 ) -> usize {
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113 MIN_ENTRY_SIZE
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114 + packed_filename_and_copy_source_size(filename, copy_source)
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115 }
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116
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117 pub fn pack_entry(
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118 filename: &HgPath,
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119 entry: &DirstateEntry,
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120 copy_source: Option<&HgPath>,
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121 packed: &mut Vec<u8>,
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122 ) {
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123 let length = packed_filename_and_copy_source_size(filename, copy_source);
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124 let (state, mode, size, mtime) = entry.v1_data();
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125
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126 // Unwrapping because `impl std::io::Write for Vec<u8>` never errors
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127 packed.write_u8(state).unwrap();
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128 packed.write_i32::<BigEndian>(mode).unwrap();
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129 packed.write_i32::<BigEndian>(size).unwrap();
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130 packed.write_i32::<BigEndian>(mtime).unwrap();
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131 packed.write_i32::<BigEndian>(length as i32).unwrap();
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132 packed.extend(filename.as_bytes());
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133 if let Some(source) = copy_source {
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134 packed.push(b'\0');
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135 packed.extend(source.as_bytes());
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136 }
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137 }