Mercurial > public > mercurial-scm > hg
annotate rust/hg-core/src/revlog/index.rs @ 45592:a886ffd2ffc6
hg-core: minor code style change (D8958#inline-14986 followup)
Differential Revision: https://phab.mercurial-scm.org/D9096
author | Antoine cezar<acezar@chwitlabs.fr> |
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date | Mon, 28 Sep 2020 13:53:11 +0200 |
parents | f38adf8b0711 |
children | da30e4b553c3 |
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1 use byteorder::{BigEndian, ByteOrder}; |
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2 |
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3 use crate::revlog::{Revision, NULL_REVISION}; |
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4 |
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5 pub const INDEX_ENTRY_SIZE: usize = 64; |
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6 |
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7 /// A Revlog index |
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8 #[derive(Debug)] |
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9 pub struct Index<'a> { |
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10 bytes: &'a [u8], |
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11 /// Offsets of starts of index blocks. |
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12 /// Only needed when the index is interleaved with data. |
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13 offsets: Option<Vec<usize>>, |
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14 } |
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15 |
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16 impl<'a> Index<'a> { |
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17 /// Create an index from bytes. |
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18 /// Calculate the start of each entry when is_inline is true. |
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19 pub fn new(bytes: &'a [u8], is_inline: bool) -> Self { |
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20 if is_inline { |
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21 let mut offset: usize = 0; |
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22 let mut offsets = Vec::new(); |
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23 |
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24 while offset + INDEX_ENTRY_SIZE <= bytes.len() { |
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25 offsets.push(offset); |
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26 let end = offset + INDEX_ENTRY_SIZE; |
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27 let entry = IndexEntry { |
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28 bytes: &bytes[offset..end], |
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29 offset_override: None, |
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30 }; |
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31 |
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32 offset += INDEX_ENTRY_SIZE + entry.compressed_len(); |
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33 } |
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34 |
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35 Self { |
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36 bytes, |
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37 offsets: Some(offsets), |
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38 } |
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39 } else { |
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40 Self { |
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41 bytes, |
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42 offsets: None, |
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43 } |
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44 } |
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45 } |
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46 |
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47 /// Return number of entries of the revlog index. |
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48 pub fn len(&self) -> usize { |
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49 if let Some(offsets) = &self.offsets { |
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50 offsets.len() |
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51 } else { |
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52 self.bytes.len() / INDEX_ENTRY_SIZE |
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53 } |
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54 } |
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55 |
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56 /// Returns `true` if the `Index` has zero `entries`. |
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57 pub fn is_empty(&self) -> bool { |
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58 self.len() == 0 |
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59 } |
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60 |
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61 /// Return the index entry corresponding to the given revision if it |
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62 /// exists. |
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63 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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64 if rev == NULL_REVISION { |
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65 return None; |
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66 } |
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67 if let Some(offsets) = &self.offsets { |
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68 self.get_entry_inline(rev, offsets) |
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69 } else { |
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70 self.get_entry_separated(rev) |
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71 } |
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72 } |
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73 |
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74 fn get_entry_inline( |
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75 &self, |
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76 rev: Revision, |
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77 offsets: &[usize], |
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78 ) -> Option<IndexEntry> { |
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79 let start = *offsets.get(rev as usize)?; |
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80 let end = start.checked_add(INDEX_ENTRY_SIZE)?; |
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81 let bytes = &self.bytes[start..end]; |
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82 |
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83 // See IndexEntry for an explanation of this override. |
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84 let offset_override = Some(end); |
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85 |
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86 Some(IndexEntry { |
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87 bytes, |
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88 offset_override, |
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89 }) |
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90 } |
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91 |
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92 fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> { |
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93 let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE; |
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94 if rev as usize >= max_rev { |
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95 return None; |
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96 } |
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97 let start = rev as usize * INDEX_ENTRY_SIZE; |
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98 let end = start + INDEX_ENTRY_SIZE; |
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99 let bytes = &self.bytes[start..end]; |
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100 |
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101 // Override the offset of the first revision as its bytes are used |
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102 // for the index's metadata (saving space because it is always 0) |
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103 let offset_override = if rev == 0 { Some(0) } else { None }; |
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104 |
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105 Some(IndexEntry { |
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106 bytes, |
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107 offset_override, |
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108 }) |
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109 } |
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110 } |
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111 |
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112 #[derive(Debug)] |
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113 pub struct IndexEntry<'a> { |
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114 bytes: &'a [u8], |
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115 /// Allows to override the offset value of the entry. |
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116 /// |
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117 /// For interleaved index and data, the offset stored in the index |
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118 /// corresponds to the separated data offset. |
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119 /// It has to be overridden with the actual offset in the interleaved |
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120 /// index which is just after the index block. |
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121 /// |
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122 /// For separated index and data, the offset stored in the first index |
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123 /// entry is mixed with the index headers. |
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124 /// It has to be overridden with 0. |
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125 offset_override: Option<usize>, |
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126 } |
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127 |
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128 impl<'a> IndexEntry<'a> { |
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129 /// Return the offset of the data if not overridden by offset_override. |
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130 pub fn offset(&self) -> usize { |
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131 if let Some(offset_override) = self.offset_override { |
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132 offset_override |
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133 } else { |
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134 let mut bytes = [0; 8]; |
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135 bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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136 BigEndian::read_u64(&bytes[..]) as usize |
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137 } |
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138 } |
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139 |
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140 /// Return the compressed length of the data. |
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141 pub fn compressed_len(&self) -> usize { |
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142 BigEndian::read_u32(&self.bytes[8..=11]) as usize |
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143 } |
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144 |
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145 /// Return the uncompressed length of the data. |
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146 pub fn uncompressed_len(&self) -> usize { |
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147 BigEndian::read_u32(&self.bytes[12..=15]) as usize |
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148 } |
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149 |
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150 /// Return the revision upon which the data has been derived. |
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151 pub fn base_revision(&self) -> Revision { |
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152 // TODO Maybe return an Option when base_revision == rev? |
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153 // Requires to add rev to IndexEntry |
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154 |
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155 BigEndian::read_i32(&self.bytes[16..]) |
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156 } |
45531
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157 |
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158 pub fn p1(&self) -> Revision { |
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159 BigEndian::read_i32(&self.bytes[24..]) |
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160 } |
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161 |
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162 pub fn p2(&self) -> Revision { |
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163 BigEndian::read_i32(&self.bytes[28..]) |
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164 } |
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165 |
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166 /// Return the hash of revision's full text. |
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167 /// |
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168 /// Currently, SHA-1 is used and only the first 20 bytes of this field |
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169 /// are used. |
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170 pub fn hash(&self) -> &[u8] { |
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171 &self.bytes[32..52] |
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172 } |
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173 } |
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174 |
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175 #[cfg(test)] |
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176 mod tests { |
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177 use super::*; |
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178 |
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179 #[cfg(test)] |
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180 #[derive(Debug, Copy, Clone)] |
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181 pub struct IndexEntryBuilder { |
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182 is_first: bool, |
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183 is_inline: bool, |
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184 is_general_delta: bool, |
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185 version: u16, |
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186 offset: usize, |
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187 compressed_len: usize, |
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188 uncompressed_len: usize, |
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189 base_revision: Revision, |
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190 } |
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191 |
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192 #[cfg(test)] |
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193 impl IndexEntryBuilder { |
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194 pub fn new() -> Self { |
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195 Self { |
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196 is_first: false, |
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197 is_inline: false, |
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198 is_general_delta: true, |
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199 version: 2, |
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200 offset: 0, |
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201 compressed_len: 0, |
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202 uncompressed_len: 0, |
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203 base_revision: 0, |
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204 } |
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205 } |
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206 |
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207 pub fn is_first(&mut self, value: bool) -> &mut Self { |
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208 self.is_first = value; |
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209 self |
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210 } |
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211 |
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212 pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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213 self.is_inline = value; |
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214 self |
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215 } |
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216 |
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217 pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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218 self.is_general_delta = value; |
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219 self |
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220 } |
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221 |
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222 pub fn with_version(&mut self, value: u16) -> &mut Self { |
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223 self.version = value; |
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224 self |
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225 } |
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226 |
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227 pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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228 self.offset = value; |
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229 self |
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230 } |
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231 |
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232 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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233 self.compressed_len = value; |
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234 self |
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235 } |
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236 |
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237 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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238 self.uncompressed_len = value; |
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239 self |
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240 } |
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241 |
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242 pub fn with_base_revision(&mut self, value: Revision) -> &mut Self { |
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243 self.base_revision = value; |
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244 self |
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245 } |
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246 |
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247 pub fn build(&self) -> Vec<u8> { |
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248 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
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249 if self.is_first { |
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250 bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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251 (false, false) => [0u8, 0], |
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252 (false, true) => [0u8, 1], |
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253 (true, false) => [0u8, 2], |
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254 (true, true) => [0u8, 3], |
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255 }); |
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256 bytes.extend(&self.version.to_be_bytes()); |
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257 // Remaining offset bytes. |
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258 bytes.extend(&[0u8; 2]); |
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259 } else { |
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260 // Offset is only 6 bytes will usize is 8. |
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261 bytes.extend(&self.offset.to_be_bytes()[2..]); |
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262 } |
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263 bytes.extend(&[0u8; 2]); // Revision flags. |
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264 bytes.extend(&self.compressed_len.to_be_bytes()[4..]); |
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265 bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]); |
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266 bytes.extend(&self.base_revision.to_be_bytes()); |
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267 bytes |
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268 } |
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269 } |
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270 |
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271 #[test] |
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272 fn test_offset() { |
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273 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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274 let entry = IndexEntry { |
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275 bytes: &bytes, |
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276 offset_override: None, |
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277 }; |
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278 |
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279 assert_eq!(entry.offset(), 1) |
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280 } |
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281 |
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282 #[test] |
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283 fn test_with_overridden_offset() { |
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284 let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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285 let entry = IndexEntry { |
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286 bytes: &bytes, |
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287 offset_override: Some(2), |
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288 }; |
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289 |
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290 assert_eq!(entry.offset(), 2) |
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291 } |
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292 |
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293 #[test] |
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294 fn test_compressed_len() { |
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295 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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296 let entry = IndexEntry { |
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297 bytes: &bytes, |
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298 offset_override: None, |
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299 }; |
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300 |
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301 assert_eq!(entry.compressed_len(), 1) |
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302 } |
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303 |
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304 #[test] |
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305 fn test_uncompressed_len() { |
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306 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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307 let entry = IndexEntry { |
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308 bytes: &bytes, |
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309 offset_override: None, |
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310 }; |
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311 |
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312 assert_eq!(entry.uncompressed_len(), 1) |
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313 } |
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314 |
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315 #[test] |
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316 fn test_base_revision() { |
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317 let bytes = IndexEntryBuilder::new().with_base_revision(1).build(); |
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318 let entry = IndexEntry { |
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319 bytes: &bytes, |
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320 offset_override: None, |
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321 }; |
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322 |
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323 assert_eq!(entry.base_revision(), 1) |
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324 } |
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325 } |
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326 |
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327 #[cfg(test)] |
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328 pub use tests::IndexEntryBuilder; |