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annotate rust/hg-core/src/revlog/index.rs @ 45531:b0d6309ff50c

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hg-core: check data integrity in `Revlog` Check that the hash of the data reconstructed from deltas matches the hash stored in the revision. Differential Revision: https://phab.mercurial-scm.org/D9005
author Antoine Cezar <antoine.cezar@octobus.net>
date Wed, 02 Sep 2020 15:23:25 +0200
parents 26c53ee51c68
children 639f33f22faf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
45531
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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 (bytes.len() - offset) >= INDEX_ENTRY_SIZE {
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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 the index entry corresponding to the given revision if it
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48 /// exists.
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49 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> {
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50 if rev == NULL_REVISION {
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51 return None;
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52 }
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53 if let Some(offsets) = &self.offsets {
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54 self.get_entry_inline(rev, offsets)
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55 } else {
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56 self.get_entry_separated(rev)
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57 }
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58 }
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59
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60 fn get_entry_inline(
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61 &self,
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62 rev: Revision,
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63 offsets: &[usize],
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64 ) -> Option<IndexEntry> {
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65 let start = *offsets.get(rev as usize)?;
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66 let end = start.checked_add(INDEX_ENTRY_SIZE)?;
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67 let bytes = &self.bytes[start..end];
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68
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69 // See IndexEntry for an explanation of this override.
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70 let offset_override = Some(end);
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71
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72 Some(IndexEntry {
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73 bytes,
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74 offset_override,
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75 })
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76 }
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77
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78 fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> {
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79 let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE;
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80 if rev as usize >= max_rev {
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81 return None;
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82 }
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83 let start = rev as usize * INDEX_ENTRY_SIZE;
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84 let end = start + INDEX_ENTRY_SIZE;
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85 let bytes = &self.bytes[start..end];
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86
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87 // See IndexEntry for an explanation of this override.
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88 let offset_override = match rev {
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89 0 => Some(0),
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90 _ => None,
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91 };
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92
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93 Some(IndexEntry {
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94 bytes,
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95 offset_override,
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96 })
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97 }
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98 }
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99
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100 #[derive(Debug)]
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101 pub struct IndexEntry<'a> {
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102 bytes: &'a [u8],
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103 /// Allows to override the offset value of the entry.
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104 ///
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105 /// For interleaved index and data, the offset stored in the index
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106 /// corresponds to the separated data offset.
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107 /// It has to be overridden with the actual offset in the interleaved
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108 /// index which is just after the index block.
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109 ///
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110 /// For separated index and data, the offset stored in the first index
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111 /// entry is mixed with the index headers.
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112 /// It has to be overridden with 0.
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113 offset_override: Option<usize>,
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114 }
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115
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116 impl<'a> IndexEntry<'a> {
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117 /// Return the offset of the data if not overridden by offset_override.
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118 pub fn offset(&self) -> usize {
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119 if let Some(offset_override) = self.offset_override {
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120 offset_override
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121 } else {
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122 let mut bytes = [0; 8];
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123 bytes[2..8].copy_from_slice(&self.bytes[0..=5]);
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124 BigEndian::read_u64(&bytes[..]) as usize
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125 }
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126 }
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127
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128 /// Return the compressed length of the data.
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129 pub fn compressed_len(&self) -> usize {
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130 BigEndian::read_u32(&self.bytes[8..=11]) as usize
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131 }
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132
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133 /// Return the uncompressed length of the data.
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134 pub fn uncompressed_len(&self) -> usize {
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135 BigEndian::read_u32(&self.bytes[12..=15]) as usize
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136 }
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137
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138 /// Return the revision upon which the data has been derived.
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139 pub fn base_revision(&self) -> Revision {
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140 // TODO Maybe return an Option when base_revision == rev?
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141 // Requires to add rev to IndexEntry
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142
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143 BigEndian::read_i32(&self.bytes[16..])
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144 }
45531
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145
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146 pub fn p1(&self) -> Revision {
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147 BigEndian::read_i32(&self.bytes[24..])
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148 }
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149
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150 pub fn p2(&self) -> Revision {
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151 BigEndian::read_i32(&self.bytes[28..])
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152 }
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153
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154 /// Return the hash of revision's full text.
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155 ///
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156 /// Currently, SHA-1 is used and only the first 20 bytes of this field
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157 /// are used.
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158 pub fn hash(&self) -> &[u8] {
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159 &self.bytes[32..52]
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160 }
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161 }
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162
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163 #[cfg(test)]
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164 mod tests {
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165 use super::*;
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166
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167 #[cfg(test)]
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168 #[derive(Debug, Copy, Clone)]
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169 pub struct IndexEntryBuilder {
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170 is_first: bool,
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171 is_inline: bool,
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172 is_general_delta: bool,
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173 version: u16,
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174 offset: usize,
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175 compressed_len: usize,
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176 uncompressed_len: usize,
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177 base_revision: Revision,
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178 }
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179
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180 #[cfg(test)]
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181 impl IndexEntryBuilder {
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182 pub fn new() -> Self {
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183 Self {
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184 is_first: false,
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185 is_inline: false,
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186 is_general_delta: true,
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187 version: 2,
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188 offset: 0,
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189 compressed_len: 0,
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190 uncompressed_len: 0,
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191 base_revision: 0,
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192 }
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193 }
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194
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195 pub fn is_first(&mut self, value: bool) -> &mut Self {
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196 self.is_first = value;
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197 self
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198 }
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199
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200 pub fn with_inline(&mut self, value: bool) -> &mut Self {
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201 self.is_inline = value;
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202 self
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203 }
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204
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205 pub fn with_general_delta(&mut self, value: bool) -> &mut Self {
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206 self.is_general_delta = value;
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207 self
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208 }
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209
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210 pub fn with_version(&mut self, value: u16) -> &mut Self {
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211 self.version = value;
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212 self
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213 }
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214
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215 pub fn with_offset(&mut self, value: usize) -> &mut Self {
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216 self.offset = value;
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217 self
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218 }
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219
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220 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self {
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221 self.compressed_len = value;
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222 self
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223 }
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224
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225 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self {
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226 self.uncompressed_len = value;
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227 self
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228 }
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229
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230 pub fn with_base_revision(&mut self, value: Revision) -> &mut Self {
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231 self.base_revision = value;
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232 self
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233 }
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234
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235 pub fn build(&self) -> Vec<u8> {
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236 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE);
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237 if self.is_first {
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238 bytes.extend(&match (self.is_general_delta, self.is_inline) {
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239 (false, false) => [0u8, 0],
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240 (false, true) => [0u8, 1],
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241 (true, false) => [0u8, 2],
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242 (true, true) => [0u8, 3],
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243 });
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244 bytes.extend(&self.version.to_be_bytes());
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245 // Remaining offset bytes.
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246 bytes.extend(&[0u8; 2]);
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247 } else {
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248 // Offset is only 6 bytes will usize is 8.
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249 bytes.extend(&self.offset.to_be_bytes()[2..]);
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250 }
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251 bytes.extend(&[0u8; 2]); // Revision flags.
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252 bytes.extend(&self.compressed_len.to_be_bytes()[4..]);
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253 bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]);
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254 bytes.extend(&self.base_revision.to_be_bytes());
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255 bytes
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256 }
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257 }
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258
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259 #[test]
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260 fn test_offset() {
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261 let bytes = IndexEntryBuilder::new().with_offset(1).build();
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262 let entry = IndexEntry {
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263 bytes: &bytes,
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264 offset_override: None,
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265 };
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266
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267 assert_eq!(entry.offset(), 1)
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268 }
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269
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270 #[test]
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271 fn test_with_overridden_offset() {
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272 let bytes = IndexEntryBuilder::new().with_offset(1).build();
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273 let entry = IndexEntry {
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274 bytes: &bytes,
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275 offset_override: Some(2),
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276 };
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277
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278 assert_eq!(entry.offset(), 2)
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279 }
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280
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281 #[test]
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282 fn test_compressed_len() {
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283 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build();
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284 let entry = IndexEntry {
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285 bytes: &bytes,
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286 offset_override: None,
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287 };
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288
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289 assert_eq!(entry.compressed_len(), 1)
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290 }
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291
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292 #[test]
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293 fn test_uncompressed_len() {
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294 let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build();
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295 let entry = IndexEntry {
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296 bytes: &bytes,
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297 offset_override: None,
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298 };
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299
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300 assert_eq!(entry.uncompressed_len(), 1)
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301 }
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302
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303 #[test]
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304 fn test_base_revision() {
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305 let bytes = IndexEntryBuilder::new().with_base_revision(1).build();
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306 let entry = IndexEntry {
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307 bytes: &bytes,
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308 offset_override: None,
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309 };
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310
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311 assert_eq!(entry.base_revision(), 1)
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312 }
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313 }
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314
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315 #[cfg(test)]
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316 pub use tests::IndexEntryBuilder;