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annotate rust/hg-core/src/revlog/index.rs @ 46063:dacb771f6dd2

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copies-rust: extract the processing of a ChangedFiles in its own function This is a reasonably independent piece of code that we can extract in its own function. This extraction will be very useful for the next changeset, where we will change the iteration order (but still do the same kind of processing). Differential Revision: https://phab.mercurial-scm.org/D9421
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 20 Nov 2020 14:17:08 +0100
parents 88e741bf2d93
children 9eb07ab3f2d4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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::revlog::node::Node;
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7 use crate::revlog::revlog::RevlogError;
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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, RevlogError> {
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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(RevlogError::Corrupted)
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48 }
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49 } else {
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50 Ok(Self {
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51 bytes,
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52 offsets: None,
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53 })
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54 }
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55 }
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56
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57 /// Value of the inline flag.
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58 pub fn is_inline(&self) -> bool {
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59 is_inline(&self.bytes)
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60 }
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61
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62 /// Return a slice of bytes if `revlog` is inline. Panic if not.
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63 pub fn data(&self, start: usize, end: usize) -> &[u8] {
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64 if !self.is_inline() {
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65 panic!("tried to access data in the index of a revlog that is not inline");
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66 }
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67 &self.bytes[start..end]
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68 }
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69
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70 /// Return number of entries of the revlog index.
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71 pub fn len(&self) -> usize {
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72 if let Some(offsets) = &self.offsets {
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73 offsets.len()
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74 } else {
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75 self.bytes.len() / INDEX_ENTRY_SIZE
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76 }
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77 }
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78
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79 /// Returns `true` if the `Index` has zero `entries`.
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80 pub fn is_empty(&self) -> bool {
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81 self.len() == 0
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82 }
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83
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84 /// Return the index entry corresponding to the given revision if it
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85 /// exists.
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86 pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> {
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87 if rev == NULL_REVISION {
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88 return None;
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89 }
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90 if let Some(offsets) = &self.offsets {
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91 self.get_entry_inline(rev, offsets)
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92 } else {
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93 self.get_entry_separated(rev)
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94 }
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95 }
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96
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97 fn get_entry_inline(
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98 &self,
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99 rev: Revision,
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100 offsets: &[usize],
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101 ) -> Option<IndexEntry> {
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102 let start = *offsets.get(rev as usize)?;
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103 let end = start.checked_add(INDEX_ENTRY_SIZE)?;
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104 let bytes = &self.bytes[start..end];
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105
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106 // See IndexEntry for an explanation of this override.
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107 let offset_override = Some(end);
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108
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109 Some(IndexEntry {
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110 bytes,
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111 offset_override,
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112 })
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113 }
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114
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115 fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> {
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116 let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE;
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117 if rev as usize >= max_rev {
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118 return None;
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119 }
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120 let start = rev as usize * INDEX_ENTRY_SIZE;
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121 let end = start + INDEX_ENTRY_SIZE;
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122 let bytes = &self.bytes[start..end];
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123
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124 // Override the offset of the first revision as its bytes are used
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125 // for the index's metadata (saving space because it is always 0)
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126 let offset_override = if rev == 0 { Some(0) } else { None };
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127
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128 Some(IndexEntry {
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129 bytes,
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130 offset_override,
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131 })
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132 }
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133 }
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134
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135 #[derive(Debug)]
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136 pub struct IndexEntry<'a> {
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137 bytes: &'a [u8],
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138 /// Allows to override the offset value of the entry.
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139 ///
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140 /// For interleaved index and data, the offset stored in the index
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141 /// corresponds to the separated data offset.
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142 /// It has to be overridden with the actual offset in the interleaved
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143 /// index which is just after the index block.
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144 ///
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145 /// For separated index and data, the offset stored in the first index
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146 /// entry is mixed with the index headers.
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147 /// It has to be overridden with 0.
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148 offset_override: Option<usize>,
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149 }
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150
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151 impl<'a> IndexEntry<'a> {
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152 /// Return the offset of the data.
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153 pub fn offset(&self) -> usize {
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154 if let Some(offset_override) = self.offset_override {
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155 offset_override
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156 } else {
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157 let mut bytes = [0; 8];
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158 bytes[2..8].copy_from_slice(&self.bytes[0..=5]);
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159 BigEndian::read_u64(&bytes[..]) as usize
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160 }
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161 }
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162
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163 /// Return the compressed length of the data.
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164 pub fn compressed_len(&self) -> usize {
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165 BigEndian::read_u32(&self.bytes[8..=11]) as usize
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166 }
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167
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168 /// Return the uncompressed length of the data.
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169 pub fn uncompressed_len(&self) -> usize {
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170 BigEndian::read_u32(&self.bytes[12..=15]) as usize
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171 }
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172
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173 /// Return the revision upon which the data has been derived.
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174 pub fn base_revision(&self) -> Revision {
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175 // TODO Maybe return an Option when base_revision == rev?
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176 // Requires to add rev to IndexEntry
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177
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178 BigEndian::read_i32(&self.bytes[16..])
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179 }
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180
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181 pub fn p1(&self) -> Revision {
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182 BigEndian::read_i32(&self.bytes[24..])
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183 }
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184
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185 pub fn p2(&self) -> Revision {
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186 BigEndian::read_i32(&self.bytes[28..])
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187 }
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188
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189 /// Return the hash of revision's full text.
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190 ///
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191 /// Currently, SHA-1 is used and only the first 20 bytes of this field
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192 /// are used.
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193 pub fn hash(&self) -> &Node {
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194 (&self.bytes[32..52]).try_into().unwrap()
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195 }
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196 }
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197
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198 /// Value of the inline flag.
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199 pub fn is_inline(index_bytes: &[u8]) -> bool {
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200 match &index_bytes[0..=1] {
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201 [0, 0] | [0, 2] => false,
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202 _ => true,
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203 }
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204 }
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205
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206 #[cfg(test)]
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207 mod tests {
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208 use super::*;
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209
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210 #[cfg(test)]
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211 #[derive(Debug, Copy, Clone)]
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212 pub struct IndexEntryBuilder {
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213 is_first: bool,
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214 is_inline: bool,
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215 is_general_delta: bool,
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216 version: u16,
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217 offset: usize,
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218 compressed_len: usize,
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219 uncompressed_len: usize,
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220 base_revision: Revision,
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221 }
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222
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223 #[cfg(test)]
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224 impl IndexEntryBuilder {
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225 pub fn new() -> Self {
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226 Self {
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227 is_first: false,
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228 is_inline: false,
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229 is_general_delta: true,
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230 version: 2,
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231 offset: 0,
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232 compressed_len: 0,
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233 uncompressed_len: 0,
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234 base_revision: 0,
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235 }
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236 }
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237
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238 pub fn is_first(&mut self, value: bool) -> &mut Self {
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239 self.is_first = value;
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240 self
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241 }
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242
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243 pub fn with_inline(&mut self, value: bool) -> &mut Self {
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244 self.is_inline = value;
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245 self
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246 }
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247
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248 pub fn with_general_delta(&mut self, value: bool) -> &mut Self {
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249 self.is_general_delta = value;
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250 self
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251 }
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252
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253 pub fn with_version(&mut self, value: u16) -> &mut Self {
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254 self.version = value;
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255 self
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256 }
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257
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258 pub fn with_offset(&mut self, value: usize) -> &mut Self {
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259 self.offset = value;
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260 self
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261 }
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262
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263 pub fn with_compressed_len(&mut self, value: usize) -> &mut Self {
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264 self.compressed_len = value;
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265 self
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266 }
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267
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268 pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self {
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269 self.uncompressed_len = value;
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270 self
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271 }
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272
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273 pub fn with_base_revision(&mut self, value: Revision) -> &mut Self {
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274 self.base_revision = value;
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275 self
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276 }
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277
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278 pub fn build(&self) -> Vec<u8> {
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279 let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE);
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280 if self.is_first {
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281 bytes.extend(&match (self.is_general_delta, self.is_inline) {
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282 (false, false) => [0u8, 0],
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283 (false, true) => [0u8, 1],
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284 (true, false) => [0u8, 2],
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285 (true, true) => [0u8, 3],
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286 });
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287 bytes.extend(&self.version.to_be_bytes());
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288 // Remaining offset bytes.
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289 bytes.extend(&[0u8; 2]);
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290 } else {
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291 // Offset is only 6 bytes will usize is 8.
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292 bytes.extend(&self.offset.to_be_bytes()[2..]);
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293 }
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294 bytes.extend(&[0u8; 2]); // Revision flags.
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295 bytes.extend(&self.compressed_len.to_be_bytes()[4..]);
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296 bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]);
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297 bytes.extend(&self.base_revision.to_be_bytes());
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298 bytes
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299 }
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300 }
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301
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302 #[test]
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303 fn is_not_inline_when_no_inline_flag_test() {
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304 let bytes = IndexEntryBuilder::new()
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305 .is_first(true)
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306 .with_general_delta(false)
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307 .with_inline(false)
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308 .build();
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309
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310 assert_eq!(is_inline(&bytes), false)
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311 }
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312
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313 #[test]
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314 fn is_inline_when_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(true)
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319 .build();
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320
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321 assert_eq!(is_inline(&bytes), true)
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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_and_generaldelta_flags_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(true)
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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 test_offset() {
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337 let bytes = IndexEntryBuilder::new().with_offset(1).build();
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338 let entry = IndexEntry {
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339 bytes: &bytes,
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340 offset_override: None,
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341 };
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342
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343 assert_eq!(entry.offset(), 1)
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344 }
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345
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346 #[test]
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347 fn test_with_overridden_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: Some(2),
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352 };
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353
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354 assert_eq!(entry.offset(), 2)
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355 }
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356
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357 #[test]
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358 fn test_compressed_len() {
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359 let bytes = IndexEntryBuilder::new().with_compressed_len(1).build();
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360 let entry = IndexEntry {
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361 bytes: &bytes,
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362 offset_override: None,
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363 };
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364
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365 assert_eq!(entry.compressed_len(), 1)
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366 }
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367
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368 #[test]
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369 fn test_uncompressed_len() {
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370 let bytes = IndexEntryBuilder::new().with_uncompressed_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.uncompressed_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_base_revision() {
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381 let bytes = IndexEntryBuilder::new().with_base_revision(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.base_revision(), 1)
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388 }
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389 }
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390
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391 #[cfg(test)]
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392 pub use tests::IndexEntryBuilder;