author | Antoine Cezar <antoine.cezar@octobus.net> |
Fri, 04 Sep 2020 11:55:07 +0200 | |
changeset 45526 | 26c53ee51c68 |
child 45531 | b0d6309ff50c |
permissions | -rw-r--r-- |
45526
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1 |
use std::borrow::Cow; |
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2 |
use std::fs::File; |
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3 |
use std::io::Read; |
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4 |
use std::ops::Deref; |
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5 |
use std::path::Path; |
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6 |
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7 |
use byteorder::{BigEndian, ByteOrder}; |
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8 |
use flate2::read::ZlibDecoder; |
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9 |
use memmap::{Mmap, MmapOptions}; |
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10 |
use micro_timer::timed; |
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use zstd; |
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12 |
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use super::index::Index; |
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use super::patch; |
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15 |
use crate::revlog::Revision; |
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16 |
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17 |
pub enum RevlogError { |
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IoError(std::io::Error), |
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UnsuportedVersion(u16), |
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InvalidRevision, |
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21 |
Corrupted, |
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22 |
UnknowDataFormat(u8), |
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23 |
} |
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24 |
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25 |
fn mmap_open(path: &Path) -> Result<Mmap, std::io::Error> { |
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26 |
let file = File::open(path)?; |
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let mmap = unsafe { MmapOptions::new().map(&file) }?; |
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Ok(mmap) |
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} |
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30 |
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/// Read only implementation of revlog. |
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32 |
pub struct Revlog { |
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/// When index and data are not interleaved: bytes of the revlog index. |
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/// When index and data are interleaved: bytes of the revlog index and |
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/// data. |
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36 |
index_bytes: Box<dyn Deref<Target = [u8]> + Send>, |
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/// When index and data are not interleaved: bytes of the revlog data |
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data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>>, |
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39 |
} |
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40 |
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41 |
impl Revlog { |
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/// Open a revlog index file. |
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/// |
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/// It will also open the associated data file if index and data are not |
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/// interleaved. |
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46 |
#[timed] |
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47 |
pub fn open(index_path: &Path) -> Result<Self, RevlogError> { |
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48 |
let index_mmap = |
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49 |
mmap_open(&index_path).map_err(RevlogError::IoError)?; |
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50 |
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let version = get_version(&index_mmap); |
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if version != 1 { |
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return Err(RevlogError::UnsuportedVersion(version)); |
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} |
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55 |
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let is_inline = is_inline(&index_mmap); |
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57 |
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let index_bytes = Box::new(index_mmap); |
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59 |
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// TODO load data only when needed // |
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// type annotation required |
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// won't recognize Mmap as Deref<Target = [u8]> |
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let data_bytes: Option<Box<dyn Deref<Target = [u8]> + Send>> = |
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if is_inline { |
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65 |
None |
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} else { |
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67 |
let data_path = index_path.with_extension("d"); |
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let data_mmap = |
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mmap_open(&data_path).map_err(RevlogError::IoError)?; |
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Some(Box::new(data_mmap)) |
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}; |
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72 |
|
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Ok(Revlog { |
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index_bytes, |
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data_bytes, |
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76 |
}) |
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77 |
} |
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78 |
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/// Return the full data associated to a revision. |
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/// |
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81 |
/// All entries required to build the final data out of deltas will be |
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/// retrieved as needed, and the deltas will be applied to the inital |
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/// snapshot to rebuild the final data. |
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84 |
#[timed] |
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85 |
pub fn get_rev_data(&self, rev: Revision) -> Result<Vec<u8>, RevlogError> { |
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86 |
// Todo return -> Cow |
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87 |
let mut entry = self.get_entry(rev)?; |
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88 |
let mut delta_chain = vec![]; |
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89 |
while let Some(base_rev) = entry.base_rev { |
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90 |
delta_chain.push(entry); |
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entry = self |
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92 |
.get_entry(base_rev) |
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.map_err(|_| RevlogError::Corrupted)?; |
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94 |
} |
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95 |
|
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96 |
if delta_chain.is_empty() { |
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97 |
Ok(entry.data()?.into()) |
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98 |
} else { |
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99 |
Revlog::build_data_from_deltas(entry, &delta_chain) |
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100 |
} |
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101 |
} |
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102 |
|
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103 |
/// Build the full data of a revision out its snapshot |
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104 |
/// and its deltas. |
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105 |
#[timed] |
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106 |
fn build_data_from_deltas( |
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107 |
snapshot: RevlogEntry, |
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108 |
deltas: &[RevlogEntry], |
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109 |
) -> Result<Vec<u8>, RevlogError> { |
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110 |
let snapshot = snapshot.data()?; |
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111 |
let deltas = deltas |
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112 |
.iter() |
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113 |
.rev() |
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114 |
.map(RevlogEntry::data) |
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115 |
.collect::<Result<Vec<Cow<'_, [u8]>>, RevlogError>>()?; |
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116 |
let patches: Vec<_> = |
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117 |
deltas.iter().map(|d| patch::PatchList::new(d)).collect(); |
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118 |
let patch = patch::fold_patch_lists(&patches); |
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119 |
Ok(patch.apply(&snapshot)) |
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120 |
} |
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121 |
|
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122 |
/// Return the revlog index. |
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123 |
fn index(&self) -> Index { |
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124 |
let is_inline = self.data_bytes.is_none(); |
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125 |
Index::new(&self.index_bytes, is_inline) |
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126 |
} |
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127 |
|
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128 |
/// Return the revlog data. |
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129 |
fn data(&self) -> &[u8] { |
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130 |
match self.data_bytes { |
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131 |
Some(ref data_bytes) => &data_bytes, |
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132 |
None => &self.index_bytes, |
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133 |
} |
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134 |
} |
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135 |
|
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136 |
/// Get an entry of the revlog. |
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137 |
fn get_entry(&self, rev: Revision) -> Result<RevlogEntry, RevlogError> { |
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138 |
let index = self.index(); |
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139 |
let index_entry = |
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140 |
index.get_entry(rev).ok_or(RevlogError::InvalidRevision)?; |
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141 |
let start = index_entry.offset(); |
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142 |
let end = start + index_entry.compressed_len(); |
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143 |
let entry = RevlogEntry { |
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144 |
rev, |
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145 |
bytes: &self.data()[start..end], |
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146 |
compressed_len: index_entry.compressed_len(), |
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147 |
uncompressed_len: index_entry.uncompressed_len(), |
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148 |
base_rev: if index_entry.base_revision() == rev { |
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149 |
None |
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150 |
} else { |
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151 |
Some(index_entry.base_revision()) |
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152 |
}, |
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153 |
}; |
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154 |
Ok(entry) |
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155 |
} |
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156 |
} |
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157 |
|
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158 |
/// The revlog entry's bytes and the necessary informations to extract |
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159 |
/// the entry's data. |
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160 |
#[derive(Debug)] |
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161 |
pub struct RevlogEntry<'a> { |
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162 |
rev: Revision, |
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163 |
bytes: &'a [u8], |
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164 |
compressed_len: usize, |
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165 |
uncompressed_len: usize, |
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166 |
base_rev: Option<Revision>, |
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167 |
} |
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168 |
|
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169 |
impl<'a> RevlogEntry<'a> { |
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170 |
/// Extract the data contained in the entry. |
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171 |
pub fn data(&self) -> Result<Cow<'_, [u8]>, RevlogError> { |
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172 |
if self.bytes.is_empty() { |
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173 |
return Ok(Cow::Borrowed(&[])); |
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174 |
} |
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175 |
match self.bytes[0] { |
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176 |
// Revision data is the entirety of the entry, including this |
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177 |
// header. |
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178 |
b'\0' => Ok(Cow::Borrowed(self.bytes)), |
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179 |
// Raw revision data follows. |
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180 |
b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), |
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181 |
// zlib (RFC 1950) data. |
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182 |
b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data())), |
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183 |
// zstd data. |
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184 |
b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data())), |
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185 |
format_type => Err(RevlogError::UnknowDataFormat(format_type)), |
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186 |
} |
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187 |
} |
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188 |
|
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189 |
fn uncompressed_zlib_data(&self) -> Vec<u8> { |
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190 |
let mut decoder = ZlibDecoder::new(self.bytes); |
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191 |
if self.is_delta() { |
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192 |
let mut buf = Vec::with_capacity(self.compressed_len); |
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193 |
decoder.read_to_end(&mut buf).expect("corrupted zlib data"); |
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194 |
buf |
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195 |
} else { |
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196 |
let mut buf = vec![0; self.uncompressed_len]; |
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197 |
decoder.read_exact(&mut buf).expect("corrupted zlib data"); |
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198 |
buf |
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199 |
} |
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200 |
} |
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201 |
|
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202 |
fn uncompressed_zstd_data(&self) -> Vec<u8> { |
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203 |
if self.is_delta() { |
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204 |
let mut buf = Vec::with_capacity(self.compressed_len); |
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205 |
zstd::stream::copy_decode(self.bytes, &mut buf) |
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206 |
.expect("corrupted zstd data"); |
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207 |
buf |
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208 |
} else { |
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209 |
let mut buf = vec![0; self.uncompressed_len]; |
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210 |
let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf) |
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211 |
.expect("corrupted zstd data"); |
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212 |
assert_eq!(len, self.uncompressed_len, "corrupted zstd data"); |
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213 |
buf |
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214 |
} |
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215 |
} |
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216 |
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/// Tell if the entry is a snapshot or a delta |
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/// (influences on decompression). |
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219 |
fn is_delta(&self) -> bool { |
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self.base_rev.is_some() |
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221 |
} |
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222 |
} |
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223 |
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/// Value of the inline flag. |
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225 |
pub fn is_inline(index_bytes: &[u8]) -> bool { |
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226 |
match &index_bytes[0..=1] { |
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227 |
[0, 0] | [0, 2] => false, |
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_ => true, |
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229 |
} |
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230 |
} |
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231 |
|
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/// Format version of the revlog. |
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233 |
pub fn get_version(index_bytes: &[u8]) -> u16 { |
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BigEndian::read_u16(&index_bytes[2..=3]) |
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235 |
} |
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236 |
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237 |
#[cfg(test)] |
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238 |
mod tests { |
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239 |
use super::*; |
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240 |
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241 |
use super::super::index::IndexEntryBuilder; |
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242 |
|
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243 |
#[cfg(test)] |
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244 |
pub struct RevlogBuilder { |
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245 |
version: u16, |
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246 |
is_general_delta: bool, |
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247 |
is_inline: bool, |
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248 |
offset: usize, |
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249 |
index: Vec<Vec<u8>>, |
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250 |
data: Vec<Vec<u8>>, |
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251 |
} |
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252 |
|
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253 |
#[cfg(test)] |
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254 |
impl RevlogBuilder { |
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255 |
pub fn new() -> Self { |
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256 |
Self { |
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257 |
version: 2, |
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258 |
is_inline: false, |
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259 |
is_general_delta: true, |
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260 |
offset: 0, |
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261 |
index: vec![], |
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262 |
data: vec![], |
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263 |
} |
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264 |
} |
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265 |
|
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266 |
pub fn with_inline(&mut self, value: bool) -> &mut Self { |
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self.is_inline = value; |
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268 |
self |
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269 |
} |
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270 |
|
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271 |
pub fn with_general_delta(&mut self, value: bool) -> &mut Self { |
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self.is_general_delta = value; |
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273 |
self |
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274 |
} |
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275 |
|
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276 |
pub fn with_version(&mut self, value: u16) -> &mut Self { |
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277 |
self.version = value; |
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278 |
self |
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279 |
} |
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280 |
|
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281 |
pub fn push( |
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282 |
&mut self, |
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283 |
mut index: IndexEntryBuilder, |
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284 |
data: Vec<u8>, |
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285 |
) -> &mut Self { |
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286 |
if self.index.is_empty() { |
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287 |
index.is_first(true); |
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288 |
index.with_general_delta(self.is_general_delta); |
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289 |
index.with_inline(self.is_inline); |
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290 |
index.with_version(self.version); |
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291 |
} else { |
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292 |
index.with_offset(self.offset); |
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293 |
} |
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294 |
self.index.push(index.build()); |
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295 |
self.offset += data.len(); |
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296 |
self.data.push(data); |
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297 |
self |
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298 |
} |
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299 |
|
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300 |
pub fn build_inline(&self) -> Vec<u8> { |
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301 |
let mut bytes = |
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302 |
Vec::with_capacity(self.index.len() + self.data.len()); |
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303 |
for (index, data) in self.index.iter().zip(self.data.iter()) { |
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304 |
bytes.extend(index); |
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305 |
bytes.extend(data); |
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306 |
} |
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307 |
bytes |
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308 |
} |
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309 |
} |
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310 |
|
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311 |
#[test] |
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312 |
fn is_not_inline_when_no_inline_flag_test() { |
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313 |
let bytes = RevlogBuilder::new() |
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314 |
.with_general_delta(false) |
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315 |
.with_inline(false) |
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316 |
.push(IndexEntryBuilder::new(), vec![]) |
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317 |
.build_inline(); |
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318 |
|
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319 |
assert_eq!(is_inline(&bytes), false) |
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320 |
} |
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321 |
|
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322 |
#[test] |
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323 |
fn is_inline_when_inline_flag_test() { |
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324 |
let bytes = RevlogBuilder::new() |
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325 |
.with_general_delta(false) |
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326 |
.with_inline(true) |
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327 |
.push(IndexEntryBuilder::new(), vec![]) |
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.build_inline(); |
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|
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assert_eq!(is_inline(&bytes), true) |
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} |
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|
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#[test] |
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fn is_inline_when_inline_and_generaldelta_flags_test() { |
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let bytes = RevlogBuilder::new() |
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.with_general_delta(true) |
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.with_inline(true) |
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.push(IndexEntryBuilder::new(), vec![]) |
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.build_inline(); |
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|
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assert_eq!(is_inline(&bytes), true) |
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} |
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343 |
|
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#[test] |
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fn version_test() { |
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let bytes = RevlogBuilder::new() |
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.with_version(1) |
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.push(IndexEntryBuilder::new(), vec![]) |
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.build_inline(); |
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|
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assert_eq!(get_version(&bytes), 1) |
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} |
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} |