diff --git a/rust/Cargo.lock b/rust/Cargo.lock --- a/rust/Cargo.lock +++ b/rust/Cargo.lock @@ -1,8 +1,13 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. 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However, this PR (https://github.com/Frommi/miniz_oxide/pull/84/files) +# introduces a flag `no_extern_crate_alloc` to bring the requirement back down +# to `1.34`. +[dependencies.flate2] +version = "1.0.16" +features = ["zlib"] +default-features = false [dev-dependencies] clap = "*" -memmap = "0.7.0" pretty_assertions = "0.6.1" tempfile = "3.1.0" diff --git a/rust/hg-core/src/revlog.rs b/rust/hg-core/src/revlog.rs --- a/rust/hg-core/src/revlog.rs +++ b/rust/hg-core/src/revlog.rs @@ -8,6 +8,9 @@ pub mod node; pub mod nodemap; pub use node::{Node, NodeError, NodePrefix, NodePrefixRef}; +pub mod index; +pub mod patch; +pub mod revlog; /// Mercurial revision numbers /// diff --git a/rust/hg-core/src/revlog/index.rs b/rust/hg-core/src/revlog/index.rs new file mode 100644 --- /dev/null +++ b/rust/hg-core/src/revlog/index.rs @@ -0,0 +1,299 @@ +use crate::revlog::{Revision, NULL_REVISION}; +use byteorder::{BigEndian, ByteOrder}; + +pub const INDEX_ENTRY_SIZE: usize = 64; + +/// A Revlog index +#[derive(Debug)] +pub struct Index<'a> { + bytes: &'a [u8], + /// Offsets of starts of index blocks. + /// Only needed when the index is interleaved with data. + offsets: Option>, +} + +impl<'a> Index<'a> { + /// Create an index from bytes. + /// Calculate the start of each entry when is_inline is true. + pub fn new(bytes: &'a [u8], is_inline: bool) -> Self { + if is_inline { + let mut offset: usize = 0; + let mut offsets = Vec::new(); + + while (bytes.len() - offset) >= INDEX_ENTRY_SIZE { + offsets.push(offset); + let end = offset + INDEX_ENTRY_SIZE; + let entry = IndexEntry { + bytes: &bytes[offset..end], + offset_override: None, + }; + + offset += INDEX_ENTRY_SIZE + entry.compressed_len(); + } + + Self { + bytes, + offsets: Some(offsets), + } + } else { + Self { + bytes, + offsets: None, + } + } + } + + /// Return the index entry corresponding to the given revision if it + /// exists. + pub fn get_entry(&self, rev: Revision) -> Option { + if rev == NULL_REVISION { + return None; + } + if let Some(offsets) = &self.offsets { + self.get_entry_inline(rev, offsets) + } else { + self.get_entry_separated(rev) + } + } + + fn get_entry_inline( + &self, + rev: Revision, + offsets: &[usize], + ) -> Option { + let start = *offsets.get(rev as usize)?; + let end = start.checked_add(INDEX_ENTRY_SIZE)?; + let bytes = &self.bytes[start..end]; + + // See IndexEntry for an explanation of this override. + let offset_override = Some(end); + + Some(IndexEntry { + bytes, + offset_override, + }) + } + + fn get_entry_separated(&self, rev: Revision) -> Option { + let max_rev = self.bytes.len() / INDEX_ENTRY_SIZE; + if rev as usize >= max_rev { + return None; + } + let start = rev as usize * INDEX_ENTRY_SIZE; + let end = start + INDEX_ENTRY_SIZE; + let bytes = &self.bytes[start..end]; + + // See IndexEntry for an explanation of this override. + let offset_override = match rev { + 0 => Some(0), + _ => None, + }; + + Some(IndexEntry { + bytes, + offset_override, + }) + } +} + +#[derive(Debug)] +pub struct IndexEntry<'a> { + bytes: &'a [u8], + /// Allows to override the offset value of the entry. + /// + /// For interleaved index and data, the offset stored in the index + /// corresponds to the separated data offset. + /// It has to be overridden with the actual offset in the interleaved + /// index which is just after the index block. + /// + /// For separated index and data, the offset stored in the first index + /// entry is mixed with the index headers. + /// It has to be overridden with 0. + offset_override: Option, +} + +impl<'a> IndexEntry<'a> { + /// Return the offset of the data if not overridden by offset_override. + pub fn offset(&self) -> usize { + if let Some(offset_override) = self.offset_override { + offset_override + } else { + let mut bytes = [0; 8]; + bytes[2..8].copy_from_slice(&self.bytes[0..=5]); + BigEndian::read_u64(&bytes[..]) as usize + } + } + + /// Return the compressed length of the data. + pub fn compressed_len(&self) -> usize { + BigEndian::read_u32(&self.bytes[8..=11]) as usize + } + + /// Return the uncompressed length of the data. + pub fn uncompressed_len(&self) -> usize { + BigEndian::read_u32(&self.bytes[12..=15]) as usize + } + + /// Return the revision upon which the data has been derived. + pub fn base_revision(&self) -> Revision { + // TODO Maybe return an Option when base_revision == rev? + // Requires to add rev to IndexEntry + + BigEndian::read_i32(&self.bytes[16..]) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[cfg(test)] + #[derive(Debug, Copy, Clone)] + pub struct IndexEntryBuilder { + is_first: bool, + is_inline: bool, + is_general_delta: bool, + version: u16, + offset: usize, + compressed_len: usize, + uncompressed_len: usize, + base_revision: Revision, + } + + #[cfg(test)] + impl IndexEntryBuilder { + pub fn new() -> Self { + Self { + is_first: false, + is_inline: false, + is_general_delta: true, + version: 2, + offset: 0, + compressed_len: 0, + uncompressed_len: 0, + base_revision: 0, + } + } + + pub fn is_first(&mut self, value: bool) -> &mut Self { + self.is_first = value; + self + } + + pub fn with_inline(&mut self, value: bool) -> &mut Self { + self.is_inline = value; + self + } + + pub fn with_general_delta(&mut self, value: bool) -> &mut Self { + self.is_general_delta = value; + self + } + + pub fn with_version(&mut self, value: u16) -> &mut Self { + self.version = value; + self + } + + pub fn with_offset(&mut self, value: usize) -> &mut Self { + self.offset = value; + self + } + + pub fn with_compressed_len(&mut self, value: usize) -> &mut Self { + self.compressed_len = value; + self + } + + pub fn with_uncompressed_len(&mut self, value: usize) -> &mut Self { + self.uncompressed_len = value; + self + } + + pub fn with_base_revision(&mut self, value: Revision) -> &mut Self { + self.base_revision = value; + self + } + + pub fn build(&self) -> Vec { + let mut bytes = Vec::with_capacity(INDEX_ENTRY_SIZE); + if self.is_first { + bytes.extend(&match (self.is_general_delta, self.is_inline) { + (false, false) => [0u8, 0], + (false, true) => [0u8, 1], + (true, false) => [0u8, 2], + (true, true) => [0u8, 3], + }); + bytes.extend(&self.version.to_be_bytes()); + // Remaining offset bytes. + bytes.extend(&[0u8; 2]); + } else { + // Offset is only 6 bytes will usize is 8. + bytes.extend(&self.offset.to_be_bytes()[2..]); + } + bytes.extend(&[0u8; 2]); // Revision flags. + bytes.extend(&self.compressed_len.to_be_bytes()[4..]); + bytes.extend(&self.uncompressed_len.to_be_bytes()[4..]); + bytes.extend(&self.base_revision.to_be_bytes()); + bytes + } + } + + #[test] + fn test_offset() { + let bytes = IndexEntryBuilder::new().with_offset(1).build(); + let entry = IndexEntry { + bytes: &bytes, + offset_override: None, + }; + + assert_eq!(entry.offset(), 1) + } + + #[test] + fn test_with_overridden_offset() { + let bytes = IndexEntryBuilder::new().with_offset(1).build(); + let entry = IndexEntry { + bytes: &bytes, + offset_override: Some(2), + }; + + assert_eq!(entry.offset(), 2) + } + + #[test] + fn test_compressed_len() { + let bytes = IndexEntryBuilder::new().with_compressed_len(1).build(); + let entry = IndexEntry { + bytes: &bytes, + offset_override: None, + }; + + assert_eq!(entry.compressed_len(), 1) + } + + #[test] + fn test_uncompressed_len() { + let bytes = IndexEntryBuilder::new().with_uncompressed_len(1).build(); + let entry = IndexEntry { + bytes: &bytes, + offset_override: None, + }; + + assert_eq!(entry.uncompressed_len(), 1) + } + + #[test] + fn test_base_revision() { + let bytes = IndexEntryBuilder::new().with_base_revision(1).build(); + let entry = IndexEntry { + bytes: &bytes, + offset_override: None, + }; + + assert_eq!(entry.base_revision(), 1) + } +} + +#[cfg(test)] +pub use tests::IndexEntryBuilder; diff --git a/rust/hg-core/src/revlog/patch.rs b/rust/hg-core/src/revlog/patch.rs new file mode 100644 --- /dev/null +++ b/rust/hg-core/src/revlog/patch.rs @@ -0,0 +1,367 @@ +use byteorder::{BigEndian, ByteOrder}; + +/// A chunk of data to insert, delete or replace in a patch +/// +/// A chunk is: +/// - an insertion when `!data.is_empty() && start == end` +/// - an deletion when `data.is_empty() && start < end` +/// - a replacement when `!data.is_empty() && start < end` +/// - not doing anything when `data.is_empty() && start == end` +#[derive(Debug, Clone)] +struct PatchFrag<'a> { + /// The start position of the chunk of data to replace + start: i32, + /// The end position of the chunk of data to replace (open end interval) + end: i32, + /// The data replacing the chunk + data: &'a [u8], +} + +impl<'a> PatchFrag<'a> { + /// Adjusted start of the chunk to replace. + /// + /// Offset allow to take into account the growth/shrinkage of data + /// induced by previously applied chunks. + fn start_offseted_by(&self, offset: i32) -> i32 { + self.start + offset + } + + /// Adjusted end of the chunk to replace. + /// + /// Offset allow to take into account the growth/shrinkage of data + /// induced by previously applied chunks. + fn end_offseted_by(&self, offset: i32) -> i32 { + self.start_offseted_by(offset) + (self.data.len() as i32) + } + + /// Length of the replaced chunk. + fn replaced_len(&self) -> i32 { + self.end - self.start + } + + /// Length difference between the replacing data and the replaced data. + fn len_diff(&self) -> i32 { + (self.data.len() as i32) - self.replaced_len() + } +} + +/// The delta between two revisions data. +#[derive(Debug, Clone)] +pub struct PatchList<'a> { + /// A collection of chunks to apply. + /// + /// Those chunks are: + /// - ordered from the left-most replacement to the right-most replacement + /// - non-overlapping, meaning that two chucks can not change the same + /// chunk of the patched data + frags: Vec>, +} + +impl<'a> PatchList<'a> { + /// Create a `PatchList` from bytes. + pub fn new(data: &'a [u8]) -> Self { + let mut frags = vec![]; + let mut data = data; + while !data.is_empty() { + let start = BigEndian::read_i32(&data[0..]); + let end = BigEndian::read_i32(&data[4..]); + let len = BigEndian::read_i32(&data[8..]); + assert!(0 <= start && start <= end && len >= 0); + frags.push(PatchFrag { + start, + end, + data: &data[12..12 + (len as usize)], + }); + data = &data[12 + (len as usize)..]; + } + PatchList { frags } + } + + /// Return the final length of data after patching + /// given its initial length . + fn size(&self, initial_size: i32) -> i32 { + self.frags + .iter() + .fold(initial_size, |acc, frag| acc + frag.len_diff()) + } + + /// Apply the patch to some data. + pub fn apply(&self, initial: &[u8]) -> Vec { + let mut last: usize = 0; + let mut vec = + Vec::with_capacity(self.size(initial.len() as i32) as usize); + for PatchFrag { start, end, data } in self.frags.iter() { + vec.extend(&initial[last..(*start as usize)]); + vec.extend(data.iter()); + last = *end as usize; + } + vec.extend(&initial[last..]); + vec + } + + /// Combine two patch lists into a single patch list. + /// + /// Applying consecutive patches can lead to waste of time and memory + /// as the changes introduced by one patch can be overridden by the next. + /// Combining patches optimizes the whole patching sequence. + fn combine(&mut self, other: &mut Self) -> Self { + let mut frags = vec![]; + + // Keep track of each growth/shrinkage resulting from applying a chunk + // in order to adjust the start/end of subsequent chunks. + let mut offset = 0i32; + + // Keep track of the chunk of self.chunks to process. + let mut pos = 0; + + // For each chunk of `other`, chunks of `self` are processed + // until they start after the end of the current chunk. + for PatchFrag { start, end, data } in other.frags.iter() { + // Add chunks of `self` that start before this chunk of `other` + // without overlap. + while pos < self.frags.len() + && self.frags[pos].end_offseted_by(offset) <= *start + { + let first = self.frags[pos].clone(); + offset += first.len_diff(); + frags.push(first); + pos += 1; + } + + // The current chunk of `self` starts before this chunk of `other` + // with overlap. + // The left-most part of data is added as an insertion chunk. + // The right-most part data is kept in the chunk. + if pos < self.frags.len() + && self.frags[pos].start_offseted_by(offset) < *start + { + let first = &mut self.frags[pos]; + + let (data_left, data_right) = first.data.split_at( + (*start - first.start_offseted_by(offset)) as usize, + ); + let left = PatchFrag { + start: first.start, + end: first.start, + data: data_left, + }; + + first.data = data_right; + + offset += left.len_diff(); + + frags.push(left); + + // There is no index incrementation because the right-most part + // needs further examination. + } + + // At this point remaining chunks of `self` starts after + // the current chunk of `other`. + + // `start_offset` will be used to adjust the start of the current + // chunk of `other`. + // Offset tracking continues with `end_offset` to adjust the end + // of the current chunk of `other`. + let mut next_offset = offset; + + // Discard the chunks of `self` that are totally overridden + // by the current chunk of `other` + while pos < self.frags.len() + && self.frags[pos].end_offseted_by(next_offset) <= *end + { + let first = &self.frags[pos]; + next_offset += first.len_diff(); + pos += 1; + } + + // Truncate the left-most part of chunk of `self` that overlaps + // the current chunk of `other`. + if pos < self.frags.len() + && self.frags[pos].start_offseted_by(next_offset) < *end + { + let first = &mut self.frags[pos]; + + let how_much_to_discard = + *end - first.start_offseted_by(next_offset); + + first.data = &first.data[(how_much_to_discard as usize)..]; + + next_offset += how_much_to_discard; + } + + // Add the chunk of `other` with adjusted position. + frags.push(PatchFrag { + start: *start - offset, + end: *end - next_offset, + data, + }); + + // Go back to normal offset tracking for the next `o` chunk + offset = next_offset; + } + + // Add remaining chunks of `self`. + for elt in &self.frags[pos..] { + frags.push(elt.clone()); + } + PatchList { frags } + } +} + +/// Combine a list of patch list into a single patch optimized patch list. +pub fn fold_patch_lists<'a>(lists: &[PatchList<'a>]) -> PatchList<'a> { + if lists.len() <= 1 { + if lists.is_empty() { + PatchList { frags: vec![] } + } else { + lists[0].clone() + } + } else { + let (left, right) = lists.split_at(lists.len() / 2); + let mut left_res = fold_patch_lists(left); + let mut right_res = fold_patch_lists(right); + left_res.combine(&mut right_res) + } +} + +#[cfg(test)] +mod tests { + use super::*; + + struct PatchDataBuilder { + data: Vec, + } + + impl PatchDataBuilder { + pub fn new() -> Self { + Self { data: vec![] } + } + + pub fn replace( + &mut self, + start: usize, + end: usize, + data: &[u8], + ) -> &mut Self { + assert!(start <= end); + self.data.extend(&(start as i32).to_be_bytes()); + self.data.extend(&(end as i32).to_be_bytes()); + self.data.extend(&(data.len() as i32).to_be_bytes()); + self.data.extend(data.iter()); + self + } + + pub fn get(&mut self) -> &[u8] { + &self.data[..] + } + } + + #[test] + fn test_ends_before() { + let data = vec![0u8, 0u8, 0u8]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(0, 1, &[1, 2]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(2, 4, &[3, 4]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![1u8, 2, 3, 4]); + } + + #[test] + fn test_starts_after() { + let data = vec![0u8, 0u8, 0u8]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(2, 3, &[3]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(1, 2, &[1, 2]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![0u8, 1, 2, 3]); + } + + #[test] + fn test_overridden() { + let data = vec![0u8, 0, 0]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(1, 2, &[3, 4]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(1, 4, &[1, 2, 3]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![0u8, 1, 2, 3]); + } + + #[test] + fn test_right_most_part_is_overridden() { + let data = vec![0u8, 0, 0]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(0, 1, &[1, 3]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(1, 4, &[2, 3, 4]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![1u8, 2, 3, 4]); + } + + #[test] + fn test_left_most_part_is_overridden() { + let data = vec![0u8, 0, 0]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(1, 3, &[1, 3, 4]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(0, 2, &[1, 2]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![1u8, 2, 3, 4]); + } + + #[test] + fn test_mid_is_overridden() { + let data = vec![0u8, 0, 0]; + let mut patch1_data = PatchDataBuilder::new(); + patch1_data.replace(0, 3, &[1, 3, 3, 4]); + let mut patch1 = PatchList::new(patch1_data.get()); + + let mut patch2_data = PatchDataBuilder::new(); + patch2_data.replace(1, 3, &[2, 3]); + let mut patch2 = PatchList::new(patch2_data.get()); + + let patch = patch1.combine(&mut patch2); + + let result = patch.apply(&data); + + assert_eq!(result, vec![1u8, 2, 3, 4]); + } +} diff --git a/rust/hg-core/src/revlog/revlog.rs b/rust/hg-core/src/revlog/revlog.rs new file mode 100644 --- /dev/null +++ b/rust/hg-core/src/revlog/revlog.rs @@ -0,0 +1,353 @@ +use std::borrow::Cow; +use std::fs::File; +use std::io::Read; +use std::ops::Deref; +use std::path::Path; + +use byteorder::{BigEndian, ByteOrder}; +use flate2::read::ZlibDecoder; +use memmap::{Mmap, MmapOptions}; +use micro_timer::timed; +use zstd; + +use super::index::Index; +use super::patch; +use crate::revlog::Revision; + +pub enum RevlogError { + IoError(std::io::Error), + UnsuportedVersion(u16), + InvalidRevision, + Corrupted, + UnknowDataFormat(u8), +} + +fn mmap_open(path: &Path) -> Result { + let file = File::open(path)?; + let mmap = unsafe { MmapOptions::new().map(&file) }?; + Ok(mmap) +} + +/// Read only implementation of revlog. +pub struct Revlog { + /// When index and data are not interleaved: bytes of the revlog index. + /// When index and data are interleaved: bytes of the revlog index and + /// data. + index_bytes: Box + Send>, + /// When index and data are not interleaved: bytes of the revlog data + data_bytes: Option + Send>>, +} + +impl Revlog { + /// Open a revlog index file. + /// + /// It will also open the associated data file if index and data are not + /// interleaved. + #[timed] + pub fn open(index_path: &Path) -> Result { + let index_mmap = + mmap_open(&index_path).map_err(RevlogError::IoError)?; + + let version = get_version(&index_mmap); + if version != 1 { + return Err(RevlogError::UnsuportedVersion(version)); + } + + let is_inline = is_inline(&index_mmap); + + let index_bytes = Box::new(index_mmap); + + // TODO load data only when needed // + // type annotation required + // won't recognize Mmap as Deref + let data_bytes: Option + Send>> = + if is_inline { + None + } else { + let data_path = index_path.with_extension("d"); + let data_mmap = + mmap_open(&data_path).map_err(RevlogError::IoError)?; + Some(Box::new(data_mmap)) + }; + + Ok(Revlog { + index_bytes, + data_bytes, + }) + } + + /// Return the full data associated to a revision. + /// + /// All entries required to build the final data out of deltas will be + /// retrieved as needed, and the deltas will be applied to the inital + /// snapshot to rebuild the final data. + #[timed] + pub fn get_rev_data(&self, rev: Revision) -> Result, RevlogError> { + // Todo return -> Cow + let mut entry = self.get_entry(rev)?; + let mut delta_chain = vec![]; + while let Some(base_rev) = entry.base_rev { + delta_chain.push(entry); + entry = self + .get_entry(base_rev) + .map_err(|_| RevlogError::Corrupted)?; + } + + if delta_chain.is_empty() { + Ok(entry.data()?.into()) + } else { + Revlog::build_data_from_deltas(entry, &delta_chain) + } + } + + /// Build the full data of a revision out its snapshot + /// and its deltas. + #[timed] + fn build_data_from_deltas( + snapshot: RevlogEntry, + deltas: &[RevlogEntry], + ) -> Result, RevlogError> { + let snapshot = snapshot.data()?; + let deltas = deltas + .iter() + .rev() + .map(RevlogEntry::data) + .collect::>, RevlogError>>()?; + let patches: Vec<_> = + deltas.iter().map(|d| patch::PatchList::new(d)).collect(); + let patch = patch::fold_patch_lists(&patches); + Ok(patch.apply(&snapshot)) + } + + /// Return the revlog index. + fn index(&self) -> Index { + let is_inline = self.data_bytes.is_none(); + Index::new(&self.index_bytes, is_inline) + } + + /// Return the revlog data. + fn data(&self) -> &[u8] { + match self.data_bytes { + Some(ref data_bytes) => &data_bytes, + None => &self.index_bytes, + } + } + + /// Get an entry of the revlog. + fn get_entry(&self, rev: Revision) -> Result { + let index = self.index(); + let index_entry = + index.get_entry(rev).ok_or(RevlogError::InvalidRevision)?; + let start = index_entry.offset(); + let end = start + index_entry.compressed_len(); + let entry = RevlogEntry { + rev, + bytes: &self.data()[start..end], + compressed_len: index_entry.compressed_len(), + uncompressed_len: index_entry.uncompressed_len(), + base_rev: if index_entry.base_revision() == rev { + None + } else { + Some(index_entry.base_revision()) + }, + }; + Ok(entry) + } +} + +/// The revlog entry's bytes and the necessary informations to extract +/// the entry's data. +#[derive(Debug)] +pub struct RevlogEntry<'a> { + rev: Revision, + bytes: &'a [u8], + compressed_len: usize, + uncompressed_len: usize, + base_rev: Option, +} + +impl<'a> RevlogEntry<'a> { + /// Extract the data contained in the entry. + pub fn data(&self) -> Result, RevlogError> { + if self.bytes.is_empty() { + return Ok(Cow::Borrowed(&[])); + } + match self.bytes[0] { + // Revision data is the entirety of the entry, including this + // header. + b'\0' => Ok(Cow::Borrowed(self.bytes)), + // Raw revision data follows. + b'u' => Ok(Cow::Borrowed(&self.bytes[1..])), + // zlib (RFC 1950) data. + b'x' => Ok(Cow::Owned(self.uncompressed_zlib_data())), + // zstd data. + b'\x28' => Ok(Cow::Owned(self.uncompressed_zstd_data())), + format_type => Err(RevlogError::UnknowDataFormat(format_type)), + } + } + + fn uncompressed_zlib_data(&self) -> Vec { + let mut decoder = ZlibDecoder::new(self.bytes); + if self.is_delta() { + let mut buf = Vec::with_capacity(self.compressed_len); + decoder.read_to_end(&mut buf).expect("corrupted zlib data"); + buf + } else { + let mut buf = vec![0; self.uncompressed_len]; + decoder.read_exact(&mut buf).expect("corrupted zlib data"); + buf + } + } + + fn uncompressed_zstd_data(&self) -> Vec { + if self.is_delta() { + let mut buf = Vec::with_capacity(self.compressed_len); + zstd::stream::copy_decode(self.bytes, &mut buf) + .expect("corrupted zstd data"); + buf + } else { + let mut buf = vec![0; self.uncompressed_len]; + let len = zstd::block::decompress_to_buffer(self.bytes, &mut buf) + .expect("corrupted zstd data"); + assert_eq!(len, self.uncompressed_len, "corrupted zstd data"); + buf + } + } + + /// Tell if the entry is a snapshot or a delta + /// (influences on decompression). + fn is_delta(&self) -> bool { + self.base_rev.is_some() + } +} + +/// Value of the inline flag. +pub fn is_inline(index_bytes: &[u8]) -> bool { + match &index_bytes[0..=1] { + [0, 0] | [0, 2] => false, + _ => true, + } +} + +/// Format version of the revlog. +pub fn get_version(index_bytes: &[u8]) -> u16 { + BigEndian::read_u16(&index_bytes[2..=3]) +} + +#[cfg(test)] +mod tests { + use super::*; + + use super::super::index::IndexEntryBuilder; + + #[cfg(test)] + pub struct RevlogBuilder { + version: u16, + is_general_delta: bool, + is_inline: bool, + offset: usize, + index: Vec>, + data: Vec>, + } + + #[cfg(test)] + impl RevlogBuilder { + pub fn new() -> Self { + Self { + version: 2, + is_inline: false, + is_general_delta: true, + offset: 0, + index: vec![], + data: vec![], + } + } + + pub fn with_inline(&mut self, value: bool) -> &mut Self { + self.is_inline = value; + self + } + + pub fn with_general_delta(&mut self, value: bool) -> &mut Self { + self.is_general_delta = value; + self + } + + pub fn with_version(&mut self, value: u16) -> &mut Self { + self.version = value; + self + } + + pub fn push( + &mut self, + mut index: IndexEntryBuilder, + data: Vec, + ) -> &mut Self { + if self.index.is_empty() { + index.is_first(true); + index.with_general_delta(self.is_general_delta); + index.with_inline(self.is_inline); + index.with_version(self.version); + } else { + index.with_offset(self.offset); + } + self.index.push(index.build()); + self.offset += data.len(); + self.data.push(data); + self + } + + pub fn build_inline(&self) -> Vec { + let mut bytes = + Vec::with_capacity(self.index.len() + self.data.len()); + for (index, data) in self.index.iter().zip(self.data.iter()) { + bytes.extend(index); + bytes.extend(data); + } + bytes + } + } + + #[test] + fn is_not_inline_when_no_inline_flag_test() { + let bytes = RevlogBuilder::new() + .with_general_delta(false) + .with_inline(false) + .push(IndexEntryBuilder::new(), vec![]) + .build_inline(); + + assert_eq!(is_inline(&bytes), false) + } + + #[test] + fn is_inline_when_inline_flag_test() { + let bytes = RevlogBuilder::new() + .with_general_delta(false) + .with_inline(true) + .push(IndexEntryBuilder::new(), vec![]) + .build_inline(); + + assert_eq!(is_inline(&bytes), true) + } + + #[test] + fn is_inline_when_inline_and_generaldelta_flags_test() { + let bytes = RevlogBuilder::new() + .with_general_delta(true) + .with_inline(true) + .push(IndexEntryBuilder::new(), vec![]) + .build_inline(); + + assert_eq!(is_inline(&bytes), true) + } + + #[test] + fn version_test() { + let bytes = RevlogBuilder::new() + .with_version(1) + .push(IndexEntryBuilder::new(), vec![]) + .build_inline(); + + assert_eq!(get_version(&bytes), 1) + } +}