author | Antoine Cezar <antoine.cezar@octobus.net> |
Fri, 04 Sep 2020 11:55:07 +0200 | |
changeset 45532 | 26c53ee51c68 |
child 45537 | b0d6309ff50c |
permissions | -rw-r--r-- |
45532
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1 |
use crate::revlog::{Revision, NULL_REVISION}; |
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2 |
use byteorder::{BigEndian, ByteOrder}; |
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3 |
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4 |
pub const INDEX_ENTRY_SIZE: usize = 64; |
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5 |
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6 |
/// A Revlog index |
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7 |
#[derive(Debug)] |
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8 |
pub struct Index<'a> { |
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9 |
bytes: &'a [u8], |
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10 |
/// Offsets of starts of index blocks. |
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11 |
/// Only needed when the index is interleaved with data. |
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12 |
offsets: Option<Vec<usize>>, |
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13 |
} |
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14 |
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15 |
impl<'a> Index<'a> { |
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16 |
/// Create an index from bytes. |
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17 |
/// Calculate the start of each entry when is_inline is true. |
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18 |
pub fn new(bytes: &'a [u8], is_inline: bool) -> Self { |
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19 |
if is_inline { |
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let mut offset: usize = 0; |
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let mut offsets = Vec::new(); |
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22 |
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23 |
while (bytes.len() - offset) >= INDEX_ENTRY_SIZE { |
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24 |
offsets.push(offset); |
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25 |
let end = offset + INDEX_ENTRY_SIZE; |
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26 |
let entry = IndexEntry { |
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bytes: &bytes[offset..end], |
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offset_override: None, |
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29 |
}; |
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30 |
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offset += INDEX_ENTRY_SIZE + entry.compressed_len(); |
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} |
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33 |
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34 |
Self { |
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35 |
bytes, |
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36 |
offsets: Some(offsets), |
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37 |
} |
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38 |
} else { |
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39 |
Self { |
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40 |
bytes, |
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41 |
offsets: None, |
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42 |
} |
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43 |
} |
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44 |
} |
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45 |
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/// Return the index entry corresponding to the given revision if it |
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/// exists. |
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48 |
pub fn get_entry(&self, rev: Revision) -> Option<IndexEntry> { |
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49 |
if rev == NULL_REVISION { |
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return None; |
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51 |
} |
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if let Some(offsets) = &self.offsets { |
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self.get_entry_inline(rev, offsets) |
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} else { |
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55 |
self.get_entry_separated(rev) |
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} |
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57 |
} |
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58 |
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59 |
fn get_entry_inline( |
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60 |
&self, |
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61 |
rev: Revision, |
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62 |
offsets: &[usize], |
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63 |
) -> Option<IndexEntry> { |
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let start = *offsets.get(rev as usize)?; |
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let end = start.checked_add(INDEX_ENTRY_SIZE)?; |
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let bytes = &self.bytes[start..end]; |
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67 |
|
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// See IndexEntry for an explanation of this override. |
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let offset_override = Some(end); |
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70 |
|
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71 |
Some(IndexEntry { |
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72 |
bytes, |
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73 |
offset_override, |
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74 |
}) |
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75 |
} |
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76 |
|
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77 |
fn get_entry_separated(&self, rev: Revision) -> Option<IndexEntry> { |
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let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE; |
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79 |
if rev as usize >= max_rev { |
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80 |
return None; |
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81 |
} |
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82 |
let start = rev as usize * INDEX_ENTRY_SIZE; |
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let end = start + INDEX_ENTRY_SIZE; |
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84 |
let bytes = &self.bytes[start..end]; |
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85 |
|
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86 |
// See IndexEntry for an explanation of this override. |
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87 |
let offset_override = match rev { |
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88 |
0 => Some(0), |
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_ => None, |
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90 |
}; |
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91 |
|
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92 |
Some(IndexEntry { |
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93 |
bytes, |
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94 |
offset_override, |
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95 |
}) |
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96 |
} |
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97 |
} |
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98 |
|
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99 |
#[derive(Debug)] |
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100 |
pub struct IndexEntry<'a> { |
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101 |
bytes: &'a [u8], |
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102 |
/// Allows to override the offset value of the entry. |
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103 |
/// |
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104 |
/// For interleaved index and data, the offset stored in the index |
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105 |
/// corresponds to the separated data offset. |
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106 |
/// It has to be overridden with the actual offset in the interleaved |
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107 |
/// index which is just after the index block. |
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108 |
/// |
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109 |
/// For separated index and data, the offset stored in the first index |
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110 |
/// entry is mixed with the index headers. |
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111 |
/// It has to be overridden with 0. |
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112 |
offset_override: Option<usize>, |
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113 |
} |
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114 |
|
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115 |
impl<'a> IndexEntry<'a> { |
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116 |
/// Return the offset of the data if not overridden by offset_override. |
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117 |
pub fn offset(&self) -> usize { |
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118 |
if let Some(offset_override) = self.offset_override { |
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119 |
offset_override |
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120 |
} else { |
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121 |
let mut bytes = [0; 8]; |
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122 |
bytes[2..8].copy_from_slice(&self.bytes[0..=5]); |
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123 |
BigEndian::read_u64(&bytes[..]) as usize |
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124 |
} |
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125 |
} |
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126 |
|
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127 |
/// Return the compressed length of the data. |
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128 |
pub fn compressed_len(&self) -> usize { |
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129 |
BigEndian::read_u32(&self.bytes[8..=11]) as usize |
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130 |
} |
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131 |
|
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132 |
/// Return the uncompressed length of the data. |
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133 |
pub fn uncompressed_len(&self) -> usize { |
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134 |
BigEndian::read_u32(&self.bytes[12..=15]) as usize |
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135 |
} |
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136 |
|
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137 |
/// Return the revision upon which the data has been derived. |
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138 |
pub fn base_revision(&self) -> Revision { |
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139 |
// TODO Maybe return an Option when base_revision == rev? |
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140 |
// Requires to add rev to IndexEntry |
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141 |
|
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142 |
BigEndian::read_i32(&self.bytes[16..]) |
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143 |
} |
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144 |
} |
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145 |
|
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146 |
#[cfg(test)] |
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147 |
mod tests { |
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148 |
use super::*; |
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149 |
|
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150 |
#[cfg(test)] |
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151 |
#[derive(Debug, Copy, Clone)] |
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152 |
pub struct IndexEntryBuilder { |
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153 |
is_first: bool, |
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154 |
is_inline: bool, |
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155 |
is_general_delta: bool, |
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156 |
version: u16, |
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157 |
offset: usize, |
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158 |
compressed_len: usize, |
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159 |
uncompressed_len: usize, |
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160 |
base_revision: Revision, |
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161 |
} |
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162 |
|
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163 |
#[cfg(test)] |
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164 |
impl IndexEntryBuilder { |
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165 |
pub fn new() -> Self { |
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166 |
Self { |
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167 |
is_first: false, |
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168 |
is_inline: false, |
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169 |
is_general_delta: true, |
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170 |
version: 2, |
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171 |
offset: 0, |
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172 |
compressed_len: 0, |
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173 |
uncompressed_len: 0, |
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174 |
base_revision: 0, |
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175 |
} |
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176 |
} |
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177 |
|
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178 |
pub fn is_first(&mut self, value: bool) -> &mut Self { |
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179 |
self.is_first = value; |
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180 |
self |
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181 |
} |
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182 |
|
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183 |
pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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184 |
self.is_inline = value; |
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185 |
self |
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186 |
} |
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187 |
|
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188 |
pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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189 |
self.is_general_delta = value; |
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190 |
self |
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191 |
} |
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192 |
|
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193 |
pub fn with_version(&mut self, value: u16) -> &mut Self { |
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194 |
self.version = value; |
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195 |
self |
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196 |
} |
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197 |
|
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198 |
pub fn with_offset(&mut self, value: usize) -> &mut Self { |
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199 |
self.offset = value; |
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200 |
self |
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201 |
} |
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202 |
|
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203 |
pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { |
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204 |
self.compressed_len = value; |
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205 |
self |
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206 |
} |
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207 |
|
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208 |
pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { |
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209 |
self.uncompressed_len = value; |
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210 |
self |
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211 |
} |
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212 |
|
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213 |
pub fn with_base_revision(&mut self, value: Revision) -> &mut Self { |
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214 |
self.base_revision = value; |
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215 |
self |
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216 |
} |
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217 |
|
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218 |
pub fn build(&self) -> Vec<u8> { |
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219 |
let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); |
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220 |
if self.is_first { |
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221 |
bytes.extend(&match (self.is_general_delta, self.is_inline) { |
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(false, false) => [0u8, 0], |
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(false, true) => [0u8, 1], |
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(true, false) => [0u8, 2], |
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(true, true) => [0u8, 3], |
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}); |
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bytes.extend(&self.version.to_be_bytes()); |
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// Remaining offset bytes. |
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bytes.extend(&[0u8; 2]); |
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} else { |
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// Offset is only 6 bytes will usize is 8. |
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bytes.extend(&self.offset.to_be_bytes()[2..]); |
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} |
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bytes.extend(&[0u8; 2]); // Revision flags. |
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bytes.extend(&self.compressed_len.to_be_bytes()[4..]); |
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bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]); |
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bytes.extend(&self.base_revision.to_be_bytes()); |
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238 |
bytes |
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239 |
} |
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240 |
} |
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241 |
|
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#[test] |
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fn test_offset() { |
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let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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let entry = IndexEntry { |
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bytes: &bytes, |
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offset_override: None, |
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}; |
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249 |
|
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assert_eq!(entry.offset(), 1) |
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} |
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252 |
|
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#[test] |
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fn test_with_overridden_offset() { |
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let bytes = IndexEntryBuilder::new().with_offset(1).build(); |
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256 |
let entry = IndexEntry { |
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bytes: &bytes, |
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offset_override: Some(2), |
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259 |
}; |
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260 |
|
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assert_eq!(entry.offset(), 2) |
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262 |
} |
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263 |
|
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264 |
#[test] |
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fn test_compressed_len() { |
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let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); |
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267 |
let entry = IndexEntry { |
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bytes: &bytes, |
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269 |
offset_override: None, |
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270 |
}; |
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271 |
|
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assert_eq!(entry.compressed_len(), 1) |
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273 |
} |
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274 |
|
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275 |
#[test] |
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276 |
fn test_uncompressed_len() { |
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let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); |
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278 |
let entry = IndexEntry { |
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279 |
bytes: &bytes, |
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280 |
offset_override: None, |
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281 |
}; |
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282 |
|
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assert_eq!(entry.uncompressed_len(), 1) |
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284 |
} |
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285 |
|
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286 |
#[test] |
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287 |
fn test_base_revision() { |
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let bytes = IndexEntryBuilder::new().with_base_revision(1).build(); |
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289 |
let entry = IndexEntry { |
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290 |
bytes: &bytes, |
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291 |
offset_override: None, |
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292 |
}; |
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293 |
|
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assert_eq!(entry.base_revision(), 1) |
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295 |
} |
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296 |
} |
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297 |
|
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298 |
#[cfg(test)] |
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299 |
pub use tests::IndexEntryBuilder; |