Mercurial > public > mercurial-scm > hg
annotate rust/hg-core/src/revlog/index.rs @ 51185:1ef4a36a934d
rust-index: add an abstraction to support bytes added at runtimes
In order to support appending data to the Rust index, we need to abstract
data access away from the immutable (on-disk) bytes, to seemlessly fetch
either from the preexisting data or from the newly added data.
author | Rapha?l Gom?s <rgomes@octobus.net> |
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date | Mon, 26 Jun 2023 19:16:07 +0200 |
parents | 4c5f6e95df84 |
children | b4d152a28742 |
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1 use std::fmt::Debug; |
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2 use std::ops::Deref; |
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3 |
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4 use byteorder::{BigEndian, ByteOrder}; |
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5 |
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6 use crate::errors::HgError; |
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7 use crate::revlog::node::Node; |
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8 use crate::revlog::{Revision, NULL_REVISION}; |
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9 use crate::{Graph, GraphError, RevlogIndex, UncheckedRevision}; |
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10 |
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11 pub const INDEX_ENTRY_SIZE: usize = 64; |
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12 |
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13 pub struct IndexHeader { |
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14 header_bytes: [u8; 4], |
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15 } |
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16 |
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17 #[derive(Copy, Clone)] |
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18 pub struct IndexHeaderFlags { |
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19 flags: u16, |
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20 } |
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21 |
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22 /// Corresponds to the high bits of `_format_flags` in python |
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23 impl IndexHeaderFlags { |
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24 /// Corresponds to FLAG_INLINE_DATA in python |
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25 pub fn is_inline(self) -> bool { |
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26 self.flags & 1 != 0 |
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27 } |
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28 /// Corresponds to FLAG_GENERALDELTA in python |
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29 pub fn uses_generaldelta(self) -> bool { |
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30 self.flags & 2 != 0 |
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31 } |
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32 } |
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33 |
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34 /// Corresponds to the INDEX_HEADER structure, |
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35 /// which is parsed as a `header` variable in `_loadindex` in `revlog.py` |
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36 impl IndexHeader { |
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37 fn format_flags(&self) -> IndexHeaderFlags { |
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38 // No "unknown flags" check here, unlike in python. Maybe there should |
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39 // be. |
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40 IndexHeaderFlags { |
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41 flags: BigEndian::read_u16(&self.header_bytes[0..2]), |
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42 } |
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43 } |
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44 |
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45 /// The only revlog version currently supported by rhg. |
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46 const REVLOGV1: u16 = 1; |
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47 |
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48 /// Corresponds to `_format_version` in Python. |
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49 fn format_version(&self) -> u16 { |
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50 BigEndian::read_u16(&self.header_bytes[2..4]) |
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51 } |
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52 |
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53 const EMPTY_INDEX_HEADER: IndexHeader = IndexHeader { |
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54 // We treat an empty file as a valid index with no entries. |
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55 // Here we make an arbitrary choice of what we assume the format of the |
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56 // index to be (V1, using generaldelta). |
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57 // This doesn't matter too much, since we're only doing read-only |
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58 // access. but the value corresponds to the `new_header` variable in |
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59 // `revlog.py`, `_loadindex` |
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60 header_bytes: [0, 3, 0, 1], |
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61 }; |
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62 |
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63 fn parse(index_bytes: &[u8]) -> Result<IndexHeader, HgError> { |
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64 if index_bytes.is_empty() { |
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65 return Ok(IndexHeader::EMPTY_INDEX_HEADER); |
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66 } |
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67 if index_bytes.len() < 4 { |
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68 return Err(HgError::corrupted( |
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69 "corrupted revlog: can't read the index format header", |
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70 )); |
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71 } |
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72 Ok(IndexHeader { |
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73 header_bytes: { |
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74 let bytes: [u8; 4] = |
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75 index_bytes[0..4].try_into().expect("impossible"); |
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76 bytes |
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77 }, |
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78 }) |
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79 } |
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80 } |
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81 |
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82 /// Abstracts the access to the index bytes since they can be spread between |
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83 /// the immutable (bytes) part and the mutable (added) part if any appends |
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84 /// happened. This makes it transparent for the callers. |
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85 struct IndexData { |
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86 /// Immutable bytes, most likely taken from disk |
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87 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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88 /// Bytes that were added after reading the index |
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89 added: Vec<u8>, |
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90 } |
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91 |
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92 impl IndexData { |
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93 pub fn new(bytes: Box<dyn Deref<Target = [u8]> + Send>) -> Self { |
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94 Self { |
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95 bytes, |
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96 added: vec![], |
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97 } |
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98 } |
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99 |
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100 pub fn len(&self) -> usize { |
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101 self.bytes.len() + self.added.len() |
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102 } |
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103 } |
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104 |
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105 impl std::ops::Index<std::ops::Range<usize>> for IndexData { |
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106 type Output = [u8]; |
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107 |
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108 fn index(&self, index: std::ops::Range<usize>) -> &Self::Output { |
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109 let start = index.start; |
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110 let end = index.end; |
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111 let immutable_len = self.bytes.len(); |
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112 if start < immutable_len { |
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113 if end > immutable_len { |
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114 panic!("index data cannot span existing and added ranges"); |
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115 } |
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116 &self.bytes[index] |
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117 } else { |
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118 &self.added[start - immutable_len..end - immutable_len] |
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119 } |
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120 } |
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121 } |
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122 |
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123 /// A Revlog index |
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124 pub struct Index { |
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125 bytes: IndexData, |
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126 /// Offsets of starts of index blocks. |
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127 /// Only needed when the index is interleaved with data. |
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128 offsets: Option<Vec<usize>>, |
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129 uses_generaldelta: bool, |
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130 } |
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131 |
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132 impl Debug for Index { |
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133 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
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134 f.debug_struct("Index") |
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135 .field("offsets", &self.offsets) |
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136 .field("uses_generaldelta", &self.uses_generaldelta) |
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137 .finish() |
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138 } |
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139 } |
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140 |
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141 impl Graph for Index { |
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142 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> { |
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143 let err = || GraphError::ParentOutOfRange(rev); |
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144 match self.get_entry(rev) { |
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145 Some(entry) => { |
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146 // The C implementation checks that the parents are valid |
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147 // before returning |
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148 Ok([ |
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149 self.check_revision(entry.p1()).ok_or_else(err)?, |
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150 self.check_revision(entry.p2()).ok_or_else(err)?, |
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151 ]) |
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152 } |
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153 None => Ok([NULL_REVISION, NULL_REVISION]), |
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154 } |
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155 } |
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156 } |
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157 |
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158 impl Index { |
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159 /// Create an index from bytes. |
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160 /// Calculate the start of each entry when is_inline is true. |
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161 pub fn new( |
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162 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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163 ) -> Result<Self, HgError> { |
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164 let header = IndexHeader::parse(bytes.as_ref())?; |
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165 |
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166 if header.format_version() != IndexHeader::REVLOGV1 { |
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167 // A proper new version should have had a repo/store |
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168 // requirement. |
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169 return Err(HgError::corrupted("unsupported revlog version")); |
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170 } |
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171 |
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172 // This is only correct because we know version is REVLOGV1. |
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173 // In v2 we always use generaldelta, while in v0 we never use |
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174 // generaldelta. Similar for [is_inline] (it's only used in v1). |
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175 let uses_generaldelta = header.format_flags().uses_generaldelta(); |
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176 |
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177 if header.format_flags().is_inline() { |
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178 let mut offset: usize = 0; |
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179 let mut offsets = Vec::new(); |
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180 |
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181 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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182 offsets.push(offset); |
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183 let end = offset + INDEX_ENTRY_SIZE; |
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184 let entry = IndexEntry { |
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185 bytes: &bytes[offset..end], |
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186 offset_override: None, |
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187 }; |
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188 |
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189 offset += INDEX_ENTRY_SIZE + entry.compressed_len() as usize; |
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190 } |
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191 |
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192 if offset == bytes.len() { |
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193 Ok(Self { |
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194 bytes: IndexData::new(bytes), |
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195 offsets: Some(offsets), |
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196 uses_generaldelta, |
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197 }) |
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198 } else { |
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199 Err(HgError::corrupted("unexpected inline revlog length")) |
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200 } |
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201 } else { |
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202 Ok(Self { |
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203 bytes: IndexData::new(bytes), |
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204 offsets: None, |
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205 uses_generaldelta, |
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206 }) |
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207 } |
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208 } |
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209 |
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210 pub fn uses_generaldelta(&self) -> bool { |
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211 self.uses_generaldelta |
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212 } |
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213 |
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214 /// Value of the inline flag. |
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215 pub fn is_inline(&self) -> bool { |
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216 self.offsets.is_some() |
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217 } |
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218 |
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219 /// Return a slice of bytes if `revlog` is inline. Panic if not. |
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220 pub fn data(&self, start: usize, end: usize) -> &[u8] { |
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221 if !self.is_inline() { |
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222 panic!("tried to access data in the index of a revlog that is not inline"); |
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223 } |
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224 &self.bytes[start..end] |
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225 } |
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226 |
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227 /// Return number of entries of the revlog index. |
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228 pub fn len(&self) -> usize { |
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229 if let Some(offsets) = &self.offsets { |
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230 offsets.len() |
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231 } else { |
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232 self.bytes.len() / INDEX_ENTRY_SIZE |
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233 } |
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234 } |
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235 |
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236 /// Returns `true` if the `Index` has zero `entries`. |
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237 pub fn is_empty(&self) -> bool { |
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238 self.len() == 0 |
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239 } |
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240 |
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241 /// Return the index entry corresponding to the given revision if it |
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242 /// exists. |
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243 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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244 if rev == NULL_REVISION { |
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245 return None; |
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246 } |
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247 Some(if let Some(offsets) = &self.offsets { |
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248 self.get_entry_inline(rev, offsets) |
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249 } else { |
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250 self.get_entry_separated(rev) |
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251 }) |
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252 } |
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253 |
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254 fn get_entry_inline( |
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255 &self, |
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256 rev: Revision, |
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257 offsets: &[usize], |
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258 ) -> IndexEntry { |
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259 let start = offsets[rev.0 as usize]; |
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260 let end = start + INDEX_ENTRY_SIZE; |
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261 let bytes = &self.bytes[start..end]; |
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262 |
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263 // See IndexEntry for an explanation of this override. |
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264 let offset_override = Some(end); |
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265 |
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266 IndexEntry { |
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267 bytes, |
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268 offset_override, |
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269 } |
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270 } |
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271 |
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272 fn get_entry_separated(&self, rev: Revision) -> IndexEntry { |
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273 let start = rev.0 as usize * INDEX_ENTRY_SIZE; |
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274 let end = start + INDEX_ENTRY_SIZE; |
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275 let bytes = &self.bytes[start..end]; |
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276 |
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277 // Override the offset of the first revision as its bytes are used |
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278 // for the index's metadata (saving space because it is always 0) |
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279 let offset_override = if rev == Revision(0) { Some(0) } else { None }; |
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280 |
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281 IndexEntry { |
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282 bytes, |
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283 offset_override, |
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284 } |
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285 } |
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286 } |
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287 |
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288 impl super::RevlogIndex for Index { |
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289 fn len(&self) -> usize { |
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290 self.len() |
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291 } |
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292 |
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293 fn node(&self, rev: Revision) -> Option<&Node> { |
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294 self.get_entry(rev).map(|entry| entry.hash()) |
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295 } |
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296 } |
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297 |
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298 #[derive(Debug)] |
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299 pub struct IndexEntry<'a> { |
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300 bytes: &'a [u8], |
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301 /// Allows to override the offset value of the entry. |
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302 /// |
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303 /// For interleaved index and data, the offset stored in the index |
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304 /// corresponds to the separated data offset. |
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305 /// It has to be overridden with the actual offset in the interleaved |
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306 /// index which is just after the index block. |
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307 /// |
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308 /// For separated index and data, the offset stored in the first index |
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309 /// entry is mixed with the index headers. |
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310 /// It has to be overridden with 0. |
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311 offset_override: Option<usize>, |
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312 } |
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313 |
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314 impl<'a> IndexEntry<'a> { |
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315 /// Return the offset of the data. |
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316 pub fn offset(&self) -> usize { |
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317 if let Some(offset_override) = self.offset_override { |
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318 offset_override |
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319 } else { |
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320 let mut bytes = [0; 8]; |
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321 bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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322 BigEndian::read_u64(&bytes[..]) as usize |
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323 } |
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324 } |
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325 |
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326 pub fn flags(&self) -> u16 { |
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327 BigEndian::read_u16(&self.bytes[6..=7]) |
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328 } |
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329 |
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330 /// Return the compressed length of the data. |
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331 pub fn compressed_len(&self) -> u32 { |
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332 BigEndian::read_u32(&self.bytes[8..=11]) |
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333 } |
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334 |
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335 /// Return the uncompressed length of the data. |
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336 pub fn uncompressed_len(&self) -> i32 { |
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337 BigEndian::read_i32(&self.bytes[12..=15]) |
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338 } |
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339 |
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340 /// Return the revision upon which the data has been derived. |
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341 pub fn base_revision_or_base_of_delta_chain(&self) -> UncheckedRevision { |
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342 // TODO Maybe return an Option when base_revision == rev? |
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343 // Requires to add rev to IndexEntry |
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344 |
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345 BigEndian::read_i32(&self.bytes[16..]).into() |
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346 } |
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347 |
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348 pub fn link_revision(&self) -> UncheckedRevision { |
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349 BigEndian::read_i32(&self.bytes[20..]).into() |
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350 } |
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351 |
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352 pub fn p1(&self) -> UncheckedRevision { |
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353 BigEndian::read_i32(&self.bytes[24..]).into() |
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354 } |
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355 |
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356 pub fn p2(&self) -> UncheckedRevision { |
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357 BigEndian::read_i32(&self.bytes[28..]).into() |
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358 } |
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359 |
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360 /// Return the hash of revision's full text. |
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361 /// |
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362 /// Currently, SHA-1 is used and only the first 20 bytes of this field |
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363 /// are used. |
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364 pub fn hash(&self) -> &'a Node { |
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365 (&self.bytes[32..52]).try_into().unwrap() |
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366 } |
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367 } |
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368 |
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369 #[cfg(test)] |
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370 mod tests { |
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371 use super::*; |
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372 use crate::node::NULL_NODE; |
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373 |
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374 #[cfg(test)] |
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375 #[derive(Debug, Copy, Clone)] |
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376 pub struct IndexEntryBuilder { |
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377 is_first: bool, |
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378 is_inline: bool, |
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379 is_general_delta: bool, |
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380 version: u16, |
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381 offset: usize, |
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382 compressed_len: usize, |
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383 uncompressed_len: usize, |
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384 base_revision_or_base_of_delta_chain: Revision, |
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385 link_revision: Revision, |
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386 p1: Revision, |
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387 p2: Revision, |
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388 node: Node, |
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389 } |
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390 |
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391 #[cfg(test)] |
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392 impl IndexEntryBuilder { |
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393 #[allow(clippy::new_without_default)] |
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394 pub fn new() -> Self { |
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395 Self { |
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396 is_first: false, |
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397 is_inline: false, |
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398 is_general_delta: true, |
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399 version: 1, |
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400 offset: 0, |
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401 compressed_len: 0, |
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402 uncompressed_len: 0, |
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403 base_revision_or_base_of_delta_chain: Revision(0), |
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404 link_revision: Revision(0), |
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405 p1: NULL_REVISION, |
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406 p2: NULL_REVISION, |
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407 node: NULL_NODE, |
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408 } |
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409 } |
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410 |
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411 pub fn is_first(&mut self, value: bool) -> &mut Self { |
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412 self.is_first = value; |
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413 self |
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414 } |
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415 |
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416 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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417 self.is_inline = value; |
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418 self |
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419 } |
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420 |
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421 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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422 self.is_general_delta = value; |
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423 self |
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424 } |
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425 |
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426 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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427 self.version = value; |
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428 self |
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429 } |
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430 |
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431 pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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432 self.offset = value; |
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433 self |
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434 } |
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435 |
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436 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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437 self.compressed_len = value; |
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438 self |
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439 } |
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440 |
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441 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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442 self.uncompressed_len = value; |
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443 self |
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444 } |
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445 |
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446 pub fn with_base_revision_or_base_of_delta_chain( |
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447 &mut self, |
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448 value: Revision, |
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449 ) -> &mut Self { |
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450 self.base_revision_or_base_of_delta_chain = value; |
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451 self |
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452 } |
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453 |
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454 pub fn with_link_revision(&mut self, value: Revision) -> &mut Self { |
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455 self.link_revision = value; |
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456 self |
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457 } |
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458 |
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459 pub fn with_p1(&mut self, value: Revision) -> &mut Self { |
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460 self.p1 = value; |
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461 self |
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462 } |
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463 |
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464 pub fn with_p2(&mut self, value: Revision) -> &mut Self { |
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465 self.p2 = value; |
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466 self |
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467 } |
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468 |
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469 pub fn with_node(&mut self, value: Node) -> &mut Self { |
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470 self.node = value; |
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471 self |
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472 } |
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473 |
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474 pub fn build(&self) -> Vec<u8> { |
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475 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
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476 if self.is_first { |
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477 bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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478 (false, false) => [0u8, 0], |
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479 (false, true) => [0u8, 1], |
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480 (true, false) => [0u8, 2], |
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481 (true, true) => [0u8, 3], |
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482 }); |
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483 bytes.extend(&self.version.to_be_bytes()); |
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484 // Remaining offset bytes. |
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485 bytes.extend(&[0u8; 2]); |
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486 } else { |
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487 // Offset stored on 48 bits (6 bytes) |
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488 bytes.extend(&(self.offset as u64).to_be_bytes()[2..]); |
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489 } |
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490 bytes.extend(&[0u8; 2]); // Revision flags. |
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491 bytes.extend(&(self.compressed_len as u32).to_be_bytes()); |
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492 bytes.extend(&(self.uncompressed_len as u32).to_be_bytes()); |
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493 bytes.extend( |
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494 &self.base_revision_or_base_of_delta_chain.0.to_be_bytes(), |
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495 ); |
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496 bytes.extend(&self.link_revision.0.to_be_bytes()); |
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497 bytes.extend(&self.p1.0.to_be_bytes()); |
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498 bytes.extend(&self.p2.0.to_be_bytes()); |
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499 bytes.extend(self.node.as_bytes()); |
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500 bytes.extend(vec![0u8; 12]); |
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501 bytes |
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502 } |
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503 } |
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504 |
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505 pub fn is_inline(index_bytes: &[u8]) -> bool { |
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506 IndexHeader::parse(index_bytes) |
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507 .expect("too short") |
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508 .format_flags() |
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509 .is_inline() |
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510 } |
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511 |
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512 pub fn uses_generaldelta(index_bytes: &[u8]) -> bool { |
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513 IndexHeader::parse(index_bytes) |
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514 .expect("too short") |
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515 .format_flags() |
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516 .uses_generaldelta() |
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517 } |
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518 |
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519 pub fn get_version(index_bytes: &[u8]) -> u16 { |
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520 IndexHeader::parse(index_bytes) |
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521 .expect("too short") |
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522 .format_version() |
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523 } |
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524 |
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525 #[test] |
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526 fn flags_when_no_inline_flag_test() { |
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527 let bytes = IndexEntryBuilder::new() |
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528 .is_first(true) |
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529 .with_general_delta(false) |
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530 .with_inline(false) |
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531 .build(); |
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532 |
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533 assert!(!is_inline(&bytes)); |
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534 assert!(!uses_generaldelta(&bytes)); |
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535 } |
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536 |
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537 #[test] |
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538 fn flags_when_inline_flag_test() { |
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539 let bytes = IndexEntryBuilder::new() |
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540 .is_first(true) |
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541 .with_general_delta(false) |
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542 .with_inline(true) |
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543 .build(); |
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544 |
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545 assert!(is_inline(&bytes)); |
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546 assert!(!uses_generaldelta(&bytes)); |
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547 } |
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548 |
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549 #[test] |
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550 fn flags_when_inline_and_generaldelta_flags_test() { |
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551 let bytes = IndexEntryBuilder::new() |
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552 .is_first(true) |
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553 .with_general_delta(true) |
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554 .with_inline(true) |
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555 .build(); |
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556 |
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557 assert!(is_inline(&bytes)); |
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558 assert!(uses_generaldelta(&bytes)); |
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559 } |
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560 |
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561 #[test] |
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562 fn test_offset() { |
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563 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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564 let entry = IndexEntry { |
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565 bytes: &bytes, |
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566 offset_override: None, |
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567 }; |
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568 |
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569 assert_eq!(entry.offset(), 1) |
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570 } |
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571 |
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572 #[test] |
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573 fn test_with_overridden_offset() { |
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574 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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575 let entry = IndexEntry { |
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576 bytes: &bytes, |
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577 offset_override: Some(2), |
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578 }; |
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579 |
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580 assert_eq!(entry.offset(), 2) |
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581 } |
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582 |
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583 #[test] |
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584 fn test_compressed_len() { |
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585 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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586 let entry = IndexEntry { |
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587 bytes: &bytes, |
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588 offset_override: None, |
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589 }; |
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590 |
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591 assert_eq!(entry.compressed_len(), 1) |
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592 } |
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593 |
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594 #[test] |
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595 fn test_uncompressed_len() { |
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596 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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597 let entry = IndexEntry { |
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598 bytes: &bytes, |
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599 offset_override: None, |
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600 }; |
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601 |
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602 assert_eq!(entry.uncompressed_len(), 1) |
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603 } |
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604 |
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605 #[test] |
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606 fn test_base_revision_or_base_of_delta_chain() { |
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607 let bytes = IndexEntryBuilder::new() |
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608 .with_base_revision_or_base_of_delta_chain(Revision(1)) |
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609 .build(); |
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610 let entry = IndexEntry { |
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611 bytes: &bytes, |
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612 offset_override: None, |
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613 }; |
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614 |
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615 assert_eq!(entry.base_revision_or_base_of_delta_chain(), 1.into()) |
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616 } |
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617 |
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618 #[test] |
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619 fn link_revision_test() { |
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620 let bytes = IndexEntryBuilder::new() |
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621 .with_link_revision(Revision(123)) |
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622 .build(); |
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623 |
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624 let entry = IndexEntry { |
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625 bytes: &bytes, |
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626 offset_override: None, |
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627 }; |
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628 |
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629 assert_eq!(entry.link_revision(), 123.into()); |
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630 } |
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631 |
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632 #[test] |
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633 fn p1_test() { |
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634 let bytes = IndexEntryBuilder::new().with_p1(Revision(123)).build(); |
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635 |
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636 let entry = IndexEntry { |
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637 bytes: &bytes, |
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638 offset_override: None, |
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639 }; |
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640 |
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641 assert_eq!(entry.p1(), 123.into()); |
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642 } |
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643 |
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644 #[test] |
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645 fn p2_test() { |
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646 let bytes = IndexEntryBuilder::new().with_p2(Revision(123)).build(); |
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647 |
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648 let entry = IndexEntry { |
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649 bytes: &bytes, |
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650 offset_override: None, |
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651 }; |
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652 |
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653 assert_eq!(entry.p2(), 123.into()); |
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654 } |
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655 |
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656 #[test] |
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657 fn node_test() { |
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658 let node = Node::from_hex("0123456789012345678901234567890123456789") |
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659 .unwrap(); |
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660 let bytes = IndexEntryBuilder::new().with_node(node).build(); |
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661 |
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662 let entry = IndexEntry { |
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663 bytes: &bytes, |
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664 offset_override: None, |
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665 }; |
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666 |
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667 assert_eq!(*entry.hash(), node); |
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668 } |
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669 |
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670 #[test] |
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671 fn version_test() { |
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672 let bytes = IndexEntryBuilder::new() |
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673 .is_first(true) |
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674 .with_version(2) |
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675 .build(); |
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676 |
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677 assert_eq!(get_version(&bytes), 2) |
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678 } |
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679 } |
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680 |
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681 #[cfg(test)] |
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682 pub use tests::IndexEntryBuilder; |