Mercurial > public > mercurial-scm > hg-stable
annotate rust/hg-core/src/revlog/index.rs @ 47991:001d747c2baf
rust: Return HgError instead of RevlogError in revlog constructors
This leaves fewer cases for callers to handle, as RevlogError is more general
Differential Revision: https://phab.mercurial-scm.org/D11410
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 13 Sep 2021 18:02:45 +0200 |
parents | 6d5a26e94d9e |
children | 61ce70fd420e |
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1 use std::convert::TryInto; |
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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 |
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10 pub const INDEX_ENTRY_SIZE: usize = 64; |
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11 |
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12 /// A Revlog index |
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13 pub struct Index { |
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14 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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15 /// Offsets of starts of index blocks. |
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16 /// Only needed when the index is interleaved with data. |
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17 offsets: Option<Vec<usize>>, |
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18 } |
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19 |
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20 impl Index { |
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21 /// Create an index from bytes. |
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22 /// Calculate the start of each entry when is_inline is true. |
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23 pub fn new( |
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24 bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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25 ) -> Result<Self, HgError> { |
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26 if is_inline(&bytes) { |
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27 let mut offset: usize = 0; |
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28 let mut offsets = Vec::new(); |
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29 |
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30 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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31 offsets.push(offset); |
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32 let end = offset + INDEX_ENTRY_SIZE; |
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33 let entry = IndexEntry { |
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34 bytes: &bytes[offset..end], |
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35 offset_override: None, |
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36 }; |
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37 |
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38 offset += INDEX_ENTRY_SIZE + entry.compressed_len(); |
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39 } |
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40 |
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41 if offset == bytes.len() { |
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42 Ok(Self { |
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43 bytes, |
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44 offsets: Some(offsets), |
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45 }) |
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46 } else { |
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47 Err(HgError::corrupted("unexpected inline revlog length") |
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48 .into()) |
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49 } |
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50 } else { |
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51 Ok(Self { |
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52 bytes, |
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53 offsets: None, |
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54 }) |
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55 } |
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56 } |
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57 |
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58 /// Value of the inline flag. |
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59 pub fn is_inline(&self) -> bool { |
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60 is_inline(&self.bytes) |
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61 } |
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62 |
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63 /// Return a slice of bytes if `revlog` is inline. Panic if not. |
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64 pub fn data(&self, start: usize, end: usize) -> &[u8] { |
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65 if !self.is_inline() { |
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66 panic!("tried to access data in the index of a revlog that is not inline"); |
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67 } |
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68 &self.bytes[start..end] |
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69 } |
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70 |
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71 /// Return number of entries of the revlog index. |
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72 pub fn len(&self) -> usize { |
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73 if let Some(offsets) = &self.offsets { |
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74 offsets.len() |
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75 } else { |
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76 self.bytes.len() / INDEX_ENTRY_SIZE |
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77 } |
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78 } |
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79 |
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80 /// Returns `true` if the `Index` has zero `entries`. |
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81 pub fn is_empty(&self) -> bool { |
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82 self.len() == 0 |
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83 } |
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84 |
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85 /// Return the index entry corresponding to the given revision if it |
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86 /// exists. |
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87 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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88 if rev == NULL_REVISION { |
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89 return None; |
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90 } |
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91 if let Some(offsets) = &self.offsets { |
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92 self.get_entry_inline(rev, offsets) |
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93 } else { |
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94 self.get_entry_separated(rev) |
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95 } |
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96 } |
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97 |
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98 fn get_entry_inline( |
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99 &self, |
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100 rev: Revision, |
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101 offsets: &[usize], |
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102 ) -> Option<IndexEntry> { |
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103 let start = *offsets.get(rev as usize)?; |
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104 let end = start.checked_add(INDEX_ENTRY_SIZE)?; |
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105 let bytes = &self.bytes[start..end]; |
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106 |
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107 // See IndexEntry for an explanation of this override. |
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108 let offset_override = Some(end); |
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109 |
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110 Some(IndexEntry { |
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111 bytes, |
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112 offset_override, |
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113 }) |
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114 } |
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115 |
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116 fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> { |
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117 let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE; |
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118 if rev as usize >= max_rev { |
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119 return None; |
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120 } |
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121 let start = rev as usize * INDEX_ENTRY_SIZE; |
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122 let end = start + INDEX_ENTRY_SIZE; |
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123 let bytes = &self.bytes[start..end]; |
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124 |
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125 // Override the offset of the first revision as its bytes are used |
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126 // for the index's metadata (saving space because it is always 0) |
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127 let offset_override = if rev == 0 { Some(0) } else { None }; |
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128 |
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129 Some(IndexEntry { |
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130 bytes, |
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131 offset_override, |
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132 }) |
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133 } |
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134 } |
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135 |
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136 impl super::RevlogIndex for Index { |
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137 fn len(&self) -> usize { |
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138 self.len() |
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139 } |
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140 |
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141 fn node(&self, rev: Revision) -> Option<&Node> { |
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142 self.get_entry(rev).map(|entry| entry.hash()) |
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143 } |
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144 } |
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145 |
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146 #[derive(Debug)] |
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147 pub struct IndexEntry<'a> { |
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148 bytes: &'a [u8], |
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149 /// Allows to override the offset value of the entry. |
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150 /// |
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151 /// For interleaved index and data, the offset stored in the index |
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152 /// corresponds to the separated data offset. |
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153 /// It has to be overridden with the actual offset in the interleaved |
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154 /// index which is just after the index block. |
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155 /// |
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156 /// For separated index and data, the offset stored in the first index |
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157 /// entry is mixed with the index headers. |
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158 /// It has to be overridden with 0. |
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159 offset_override: Option<usize>, |
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160 } |
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161 |
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162 impl<'a> IndexEntry<'a> { |
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163 /// Return the offset of the data. |
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164 pub fn offset(&self) -> usize { |
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165 if let Some(offset_override) = self.offset_override { |
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166 offset_override |
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167 } else { |
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168 let mut bytes = [0; 8]; |
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169 bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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170 BigEndian::read_u64(&bytes[..]) as usize |
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171 } |
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172 } |
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173 |
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174 /// Return the compressed length of the data. |
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175 pub fn compressed_len(&self) -> usize { |
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176 BigEndian::read_u32(&self.bytes[8..=11]) as usize |
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177 } |
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178 |
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179 /// Return the uncompressed length of the data. |
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180 pub fn uncompressed_len(&self) -> usize { |
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181 BigEndian::read_u32(&self.bytes[12..=15]) as usize |
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182 } |
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183 |
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184 /// Return the revision upon which the data has been derived. |
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185 pub fn base_revision(&self) -> Revision { |
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186 // TODO Maybe return an Option when base_revision == rev? |
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187 // Requires to add rev to IndexEntry |
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188 |
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189 BigEndian::read_i32(&self.bytes[16..]) |
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190 } |
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191 |
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192 pub fn p1(&self) -> Revision { |
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193 BigEndian::read_i32(&self.bytes[24..]) |
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194 } |
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195 |
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196 pub fn p2(&self) -> Revision { |
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197 BigEndian::read_i32(&self.bytes[28..]) |
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198 } |
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199 |
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200 /// Return the hash of revision's full text. |
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201 /// |
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202 /// Currently, SHA-1 is used and only the first 20 bytes of this field |
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203 /// are used. |
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204 pub fn hash(&self) -> &'a Node { |
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205 (&self.bytes[32..52]).try_into().unwrap() |
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206 } |
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207 } |
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208 |
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209 /// Value of the inline flag. |
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210 pub fn is_inline(index_bytes: &[u8]) -> bool { |
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211 match &index_bytes[0..=1] { |
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212 [0, 0] | [0, 2] => false, |
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213 _ => true, |
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214 } |
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215 } |
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216 |
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217 #[cfg(test)] |
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218 mod tests { |
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219 use super::*; |
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220 |
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221 #[cfg(test)] |
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222 #[derive(Debug, Copy, Clone)] |
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223 pub struct IndexEntryBuilder { |
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224 is_first: bool, |
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225 is_inline: bool, |
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226 is_general_delta: bool, |
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227 version: u16, |
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228 offset: usize, |
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229 compressed_len: usize, |
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230 uncompressed_len: usize, |
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231 base_revision: Revision, |
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232 } |
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233 |
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234 #[cfg(test)] |
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235 impl IndexEntryBuilder { |
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236 pub fn new() -> Self { |
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237 Self { |
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238 is_first: false, |
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239 is_inline: false, |
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240 is_general_delta: true, |
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241 version: 2, |
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242 offset: 0, |
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243 compressed_len: 0, |
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244 uncompressed_len: 0, |
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245 base_revision: 0, |
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246 } |
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247 } |
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248 |
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249 pub fn is_first(&mut self, value: bool) -> &mut Self { |
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250 self.is_first = value; |
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251 self |
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252 } |
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253 |
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254 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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255 self.is_inline = value; |
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256 self |
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257 } |
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258 |
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259 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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260 self.is_general_delta = value; |
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261 self |
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262 } |
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263 |
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264 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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265 self.version = value; |
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266 self |
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267 } |
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268 |
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269 pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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270 self.offset = value; |
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271 self |
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272 } |
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273 |
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274 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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275 self.compressed_len = value; |
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276 self |
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277 } |
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278 |
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279 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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280 self.uncompressed_len = value; |
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281 self |
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282 } |
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283 |
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284 pub fn with_base_revision(&mut self, value: Revision) -> &mut Self { |
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285 self.base_revision = value; |
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286 self |
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287 } |
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288 |
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289 pub fn build(&self) -> Vec<u8> { |
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290 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
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291 if self.is_first { |
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292 bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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293 (false, false) => [0u8, 0], |
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294 (false, true) => [0u8, 1], |
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295 (true, false) => [0u8, 2], |
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296 (true, true) => [0u8, 3], |
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297 }); |
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298 bytes.extend(&self.version.to_be_bytes()); |
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299 // Remaining offset bytes. |
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300 bytes.extend(&[0u8; 2]); |
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301 } else { |
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302 // Offset stored on 48 bits (6 bytes) |
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303 bytes.extend(&(self.offset as u64).to_be_bytes()[2..]); |
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304 } |
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305 bytes.extend(&[0u8; 2]); // Revision flags. |
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306 bytes.extend(&(self.compressed_len as u32).to_be_bytes()); |
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307 bytes.extend(&(self.uncompressed_len as u32).to_be_bytes()); |
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308 bytes.extend(&self.base_revision.to_be_bytes()); |
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309 bytes |
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310 } |
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311 } |
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312 |
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313 #[test] |
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314 fn is_not_inline_when_no_inline_flag_test() { |
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315 let bytes = IndexEntryBuilder::new() |
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316 .is_first(true) |
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317 .with_general_delta(false) |
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318 .with_inline(false) |
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319 .build(); |
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320 |
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321 assert_eq!(is_inline(&bytes), false) |
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322 } |
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323 |
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324 #[test] |
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325 fn is_inline_when_inline_flag_test() { |
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326 let bytes = IndexEntryBuilder::new() |
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327 .is_first(true) |
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328 .with_general_delta(false) |
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329 .with_inline(true) |
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330 .build(); |
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331 |
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332 assert_eq!(is_inline(&bytes), true) |
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333 } |
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334 |
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335 #[test] |
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336 fn is_inline_when_inline_and_generaldelta_flags_test() { |
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337 let bytes = IndexEntryBuilder::new() |
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338 .is_first(true) |
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339 .with_general_delta(true) |
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340 .with_inline(true) |
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341 .build(); |
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342 |
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343 assert_eq!(is_inline(&bytes), true) |
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344 } |
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345 |
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346 #[test] |
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347 fn test_offset() { |
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348 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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349 let entry = IndexEntry { |
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350 bytes: &bytes, |
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351 offset_override: None, |
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352 }; |
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353 |
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354 assert_eq!(entry.offset(), 1) |
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355 } |
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356 |
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357 #[test] |
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358 fn test_with_overridden_offset() { |
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359 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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360 let entry = IndexEntry { |
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361 bytes: &bytes, |
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362 offset_override: Some(2), |
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363 }; |
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364 |
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365 assert_eq!(entry.offset(), 2) |
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366 } |
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367 |
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368 #[test] |
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369 fn test_compressed_len() { |
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370 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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371 let entry = IndexEntry { |
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372 bytes: &bytes, |
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373 offset_override: None, |
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374 }; |
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375 |
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376 assert_eq!(entry.compressed_len(), 1) |
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377 } |
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378 |
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379 #[test] |
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380 fn test_uncompressed_len() { |
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381 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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382 let entry = IndexEntry { |
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383 bytes: &bytes, |
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384 offset_override: None, |
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385 }; |
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386 |
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387 assert_eq!(entry.uncompressed_len(), 1) |
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388 } |
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389 |
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390 #[test] |
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391 fn test_base_revision() { |
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392 let bytes = IndexEntryBuilder::new().with_base_revision(1).build(); |
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393 let entry = IndexEntry { |
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394 bytes: &bytes, |
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395 offset_override: None, |
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396 }; |
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397 |
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398 assert_eq!(entry.base_revision(), 1) |
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399 } |
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400 } |
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401 |
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402 #[cfg(test)] |
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403 pub use tests::IndexEntryBuilder; |