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Differential D9049

hg-core: add path_encode
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Authored by acezar on Sep 18 2020, 12:01 PM.

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rHGaebc976fd7d5: hg-core: add path_encode

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acezar created this revision.Sep 18 2020, 12:01 PM
acezar added a commit: rHGaebc976fd7d5: hg-core: add path_encode.Sep 23 2020, 10:58 AM
This revision was not accepted when it landed; it landed in state Needs Review.
Closed by commit rHGaebc976fd7d5: hg-core: add path_encode (authored by acezar). · Explain Why
This revision was automatically updated to reflect the committed changes.

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rust/hg-core/src/revlog.rs

// Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net> // Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net>
// and Mercurial contributors // and Mercurial contributors
// //
// This software may be used and distributed according to the terms of the // This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version. // GNU General Public License version 2 or any later version.
//! Mercurial concepts for handling revision history //! Mercurial concepts for handling revision history
pub mod node; pub mod node;
pub mod nodemap; pub mod nodemap;
pub mod path_encode;
pub use node::{Node, NodeError, NodePrefix, NodePrefixRef}; pub use node::{Node, NodeError, NodePrefix, NodePrefixRef};
pub mod changelog; pub mod changelog;
pub mod index; pub mod index;
pub mod manifest; pub mod manifest;
pub mod patch; pub mod patch;
pub mod revlog; pub mod revlog;
/// Mercurial revision numbers /// Mercurial revision numbers

rust/hg-core/src/revlog/path_encode.rs

  • This file was added.
use crypto::digest::Digest;
use crypto::sha1::Sha1;
#[derive(PartialEq, Debug)]
#[allow(non_camel_case_types)]
enum path_state {
START, /* first byte of a path component */
A, /* "AUX" */
AU,
THIRD, /* third of a 3-byte sequence, e.g. "AUX", "NUL" */
C, /* "CON" or "COMn" */
CO,
COMLPT, /* "COM" or "LPT" */
COMLPTn,
L,
LP,
N,
NU,
P, /* "PRN" */
PR,
LDOT, /* leading '.' */
DOT, /* '.' in a non-leading position */
H, /* ".h" */
HGDI, /* ".hg", ".d", or ".i" */
SPACE,
DEFAULT, /* byte of a path component after the first */
}
/* state machine for dir-encoding */
#[allow(non_camel_case_types)]
enum dir_state {
DDOT,
DH,
DHGDI,
DDEFAULT,
}
fn inset(bitset: &[u32; 8], c: u8) -> bool {
bitset[(c as usize) >> 5] & (1 << (c & 31)) != 0
}
fn charcopy(dest: Option<&mut [u8]>, destlen: &mut usize, c: u8) {
if let Some(slice) = dest {
slice[*destlen] = c
}
*destlen += 1
}
fn memcopy(dest: Option<&mut [u8]>, destlen: &mut usize, src: &[u8]) {
if let Some(slice) = dest {
slice[*destlen..*destlen + src.len()].copy_from_slice(src)
}
*destlen += src.len();
}
fn rewrap_option<'a, 'b: 'a>(
x: &'a mut Option<&'b mut [u8]>,
) -> Option<&'a mut [u8]> {
match x {
None => None,
Some(y) => Some(y),
}
}
fn hexencode<'a>(mut dest: Option<&'a mut [u8]>, destlen: &mut usize, c: u8) {
let hexdigit = b"0123456789abcdef";
charcopy(
rewrap_option(&mut dest),
destlen,
hexdigit[(c as usize) >> 4],
);
charcopy(dest, destlen, hexdigit[(c as usize) & 15]);
}
/* 3-byte escape: tilde followed by two hex digits */
fn escape3(mut dest: Option<&mut [u8]>, destlen: &mut usize, c: u8) {
charcopy(rewrap_option(&mut dest), destlen, b'~');
hexencode(dest, destlen, c);
}
fn encode_dir(mut dest: Option<&mut [u8]>, src: &[u8]) -> usize {
let mut state = dir_state::DDEFAULT;
let mut i = 0;
let mut destlen = 0;
while i < src.len() {
match state {
dir_state::DDOT => match src[i] {
b'd' | b'i' => {
state = dir_state::DHGDI;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'h' => {
state = dir_state::DH;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
_ => {
state = dir_state::DDEFAULT;
}
},
dir_state::DH => {
if src[i] == b'g' {
state = dir_state::DHGDI;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = dir_state::DDEFAULT;
}
}
dir_state::DHGDI => {
if src[i] == b'/' {
memcopy(rewrap_option(&mut dest), &mut destlen, b".hg");
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
state = dir_state::DDEFAULT;
}
dir_state::DDEFAULT => {
if src[i] == b'.' {
state = dir_state::DDOT
}
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
}
}
destlen
}
fn _encode(
twobytes: &[u32; 8],
onebyte: &[u32; 8],
mut dest: Option<&mut [u8]>,
src: &[u8],
encodedir: bool,
) -> usize {
let mut state = path_state::START;
let mut i = 0;
let mut destlen = 0;
let len = src.len();
while i < len {
match state {
path_state::START => match src[i] {
b'/' => {
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'.' => {
state = path_state::LDOT;
escape3(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b' ' => {
state = path_state::DEFAULT;
escape3(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'a' => {
state = path_state::A;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'c' => {
state = path_state::C;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'l' => {
state = path_state::L;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'n' => {
state = path_state::N;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'p' => {
state = path_state::P;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
_ => {
state = path_state::DEFAULT;
}
},
path_state::A => {
if src[i] == b'u' {
state = path_state::AU;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::AU => {
if src[i] == b'x' {
state = path_state::THIRD;
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::THIRD => {
state = path_state::DEFAULT;
match src[i] {
b'.' | b'/' | b'\0' => escape3(
rewrap_option(&mut dest),
&mut destlen,
src[i - 1],
),
_ => i -= 1,
}
}
path_state::C => {
if src[i] == b'o' {
state = path_state::CO;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::CO => {
if src[i] == b'm' {
state = path_state::COMLPT;
i += 1;
} else if src[i] == b'n' {
state = path_state::THIRD;
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::COMLPT => {
if src[i] >= b'1' && src[i] <= b'9' {
state = path_state::COMLPTn;
i += 1;
} else {
state = path_state::DEFAULT;
charcopy(
rewrap_option(&mut dest),
&mut destlen,
src[i - 1],
);
}
}
path_state::COMLPTn => {
state = path_state::DEFAULT;
match src[i] {
b'.' | b'/' | b'\0' => {
escape3(
rewrap_option(&mut dest),
&mut destlen,
src[i - 2],
);
charcopy(
rewrap_option(&mut dest),
&mut destlen,
src[i - 1],
);
}
_ => {
memcopy(
rewrap_option(&mut dest),
&mut destlen,
&src[i - 2..i],
);
}
}
}
path_state::L => {
if src[i] == b'p' {
state = path_state::LP;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::LP => {
if src[i] == b't' {
state = path_state::COMLPT;
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::N => {
if src[i] == b'u' {
state = path_state::NU;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::NU => {
if src[i] == b'l' {
state = path_state::THIRD;
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::P => {
if src[i] == b'r' {
state = path_state::PR;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::PR => {
if src[i] == b'n' {
state = path_state::THIRD;
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::LDOT => match src[i] {
b'd' | b'i' => {
state = path_state::HGDI;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'h' => {
state = path_state::H;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
_ => {
state = path_state::DEFAULT;
}
},
path_state::DOT => match src[i] {
b'/' | b'\0' => {
state = path_state::START;
memcopy(rewrap_option(&mut dest), &mut destlen, b"~2e");
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'd' | b'i' => {
state = path_state::HGDI;
charcopy(rewrap_option(&mut dest), &mut destlen, b'.');
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
b'h' => {
state = path_state::H;
memcopy(rewrap_option(&mut dest), &mut destlen, b".h");
i += 1;
}
_ => {
state = path_state::DEFAULT;
charcopy(rewrap_option(&mut dest), &mut destlen, b'.');
}
},
path_state::H => {
if src[i] == b'g' {
state = path_state::HGDI;
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
} else {
state = path_state::DEFAULT;
}
}
path_state::HGDI => {
if src[i] == b'/' {
state = path_state::START;
if encodedir {
memcopy(
rewrap_option(&mut dest),
&mut destlen,
b".hg",
);
}
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1
} else {
state = path_state::DEFAULT;
}
}
path_state::SPACE => match src[i] {
b'/' | b'\0' => {
state = path_state::START;
memcopy(rewrap_option(&mut dest), &mut destlen, b"~20");
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
_ => {
state = path_state::DEFAULT;
charcopy(rewrap_option(&mut dest), &mut destlen, b' ');
}
},
path_state::DEFAULT => {
while i != len && inset(onebyte, src[i]) {
charcopy(rewrap_option(&mut dest), &mut destlen, src[i]);
i += 1;
}
if i == len {
break;
}
match src[i] {
b'.' => {
state = path_state::DOT;
i += 1
}
b' ' => {
state = path_state::SPACE;
i += 1
}
b'/' => {
state = path_state::START;
charcopy(rewrap_option(&mut dest), &mut destlen, b'/');
i += 1;
}
_ => {
if inset(onebyte, src[i]) {
loop {
charcopy(
rewrap_option(&mut dest),
&mut destlen,
src[i],
);
i += 1;
if !(i < len && inset(onebyte, src[i])) {
break;
}
}
} else if inset(twobytes, src[i]) {
let c = src[i];
i += 1;
charcopy(
rewrap_option(&mut dest),
&mut destlen,
b'_',
);
charcopy(
rewrap_option(&mut dest),
&mut destlen,
if c == b'_' { b'_' } else { c + 32 },
);
} else {
escape3(
rewrap_option(&mut dest),
&mut destlen,
src[i],
);
i += 1;
}
}
}
}
}
}
match state {
path_state::START => (),
path_state::A => (),
path_state::AU => (),
path_state::THIRD => {
escape3(rewrap_option(&mut dest), &mut destlen, src[i - 1])
}
path_state::C => (),
path_state::CO => (),
path_state::COMLPT => {
charcopy(rewrap_option(&mut dest), &mut destlen, src[i - 1])
}
path_state::COMLPTn => {
escape3(rewrap_option(&mut dest), &mut destlen, src[i - 2]);
charcopy(rewrap_option(&mut dest), &mut destlen, src[i - 1]);
}
path_state::L => (),
path_state::LP => (),
path_state::N => (),
path_state::NU => (),
path_state::P => (),
path_state::PR => (),
path_state::LDOT => (),
path_state::DOT => {
memcopy(rewrap_option(&mut dest), &mut destlen, b"~2e");
}
path_state::H => (),
path_state::HGDI => (),
path_state::SPACE => {
memcopy(rewrap_option(&mut dest), &mut destlen, b"~20");
}
path_state::DEFAULT => (),
};
destlen
}
fn basic_encode(dest: Option<&mut [u8]>, src: &[u8]) -> usize {
let twobytes: [u32; 8] = [0, 0, 0x87ff_fffe, 0, 0, 0, 0, 0];
let onebyte: [u32; 8] =
[1, 0x2bff_3bfa, 0x6800_0001, 0x2fff_ffff, 0, 0, 0, 0];
_encode(&twobytes, &onebyte, dest, src, true)
}
const MAXSTOREPATHLEN: usize = 120;
fn lower_encode(mut dest: Option<&mut [u8]>, src: &[u8]) -> usize {
let onebyte: [u32; 8] =
[1, 0x2bff_fbfb, 0xe800_0001, 0x2fff_ffff, 0, 0, 0, 0];
let lower: [u32; 8] = [0, 0, 0x07ff_fffe, 0, 0, 0, 0, 0];
let mut destlen = 0;
for c in src {
if inset(&onebyte, *c) {
charcopy(rewrap_option(&mut dest), &mut destlen, *c)
} else if inset(&lower, *c) {
charcopy(rewrap_option(&mut dest), &mut destlen, *c + 32)
} else {
escape3(rewrap_option(&mut dest), &mut destlen, *c)
}
}
destlen
}
fn aux_encode(dest: Option<&mut [u8]>, src: &[u8]) -> usize {
let twobytes = [0; 8];
let onebyte: [u32; 8] = [!0, 0xffff_3ffe, !0, !0, !0, !0, !0, !0];
_encode(&twobytes, &onebyte, dest, src, false)
}
fn hash_mangle(src: &[u8], sha: &[u8]) -> Vec<u8> {
let dirprefixlen = 8;
let maxshortdirslen = 68;
let mut destlen = 0;
let last_slash = src.iter().rposition(|b| *b == b'/');
let last_dot: Option<usize> = {
let s = last_slash.unwrap_or(0);
src[s..]
.iter()
.rposition(|b| *b == b'.')
.and_then(|i| Some(i + s))
};
let mut dest = vec![0; MAXSTOREPATHLEN];
memcopy(Some(&mut dest), &mut destlen, b"dh/");
{
let mut first = true;
for slice in src[..last_slash.unwrap_or_else(|| src.len())]
.split(|b| *b == b'/')
{
let slice = &slice[..std::cmp::min(slice.len(), dirprefixlen)];
if destlen + (slice.len() + if first { 0 } else { 1 })
> maxshortdirslen + 3
{
break;
} else {
if !first {
charcopy(Some(&mut dest), &mut destlen, b'/')
};
memcopy(Some(&mut dest), &mut destlen, slice);
if dest[destlen - 1] == b'.' || dest[destlen - 1] == b' ' {
dest[destlen - 1] = b'_'
}
}
first = false;
}
if !first {
charcopy(Some(&mut dest), &mut destlen, b'/');
}
}
let used = destlen + 40 + {
if let Some(l) = last_dot {
src.len() - l
} else {
0
}
};
if MAXSTOREPATHLEN > used {
let slop = MAXSTOREPATHLEN - used;
let basenamelen = match last_slash {
Some(l) => src.len() - l - 1,
None => src.len(),
};
let basenamelen = std::cmp::min(basenamelen, slop);
if basenamelen > 0 {
let start = match last_slash {
Some(l) => l + 1,
None => 0,
};
memcopy(
Some(&mut dest),
&mut destlen,
&src[start..][..basenamelen],
)
}
}
for c in sha {
hexencode(Some(&mut dest), &mut destlen, *c);
}
if let Some(l) = last_dot {
memcopy(Some(&mut dest), &mut destlen, &src[l..]);
}
if destlen == dest.len() {
dest
} else {
// sometimes the path are shorter than MAXSTOREPATHLEN
dest[..destlen].to_vec()
}
}
const MAXENCODE: usize = 4096 * 4;
fn hash_encode(src: &[u8]) -> Vec<u8> {
let dired = &mut [0; MAXENCODE];
let lowered = &mut [0; MAXENCODE];
let auxed = &mut [0; MAXENCODE];
let baselen = (src.len() - 5) * 3;
if baselen >= MAXENCODE {
panic!("path_encode::hash_encore: string too long: {}", baselen)
};
let dirlen = encode_dir(Some(&mut dired[..]), src);
let sha = {
let mut hasher = Sha1::new();
hasher.input(&dired[..dirlen]);
let mut hash = vec![0; 20];
hasher.result(&mut hash);
hash
};
let lowerlen = lower_encode(Some(&mut lowered[..]), &dired[..dirlen][5..]);
let auxlen = aux_encode(Some(&mut auxed[..]), &lowered[..lowerlen]);
hash_mangle(&auxed[..auxlen], &sha)
}
pub fn path_encode(path: &[u8]) -> Vec<u8> {
let newlen = if path.len() <= MAXSTOREPATHLEN {
basic_encode(None, path)
} else {
MAXSTOREPATHLEN + 1
};
if newlen <= MAXSTOREPATHLEN {
if newlen == path.len() {
path.to_vec()
} else {
let mut res = vec![0; newlen];
basic_encode(Some(&mut res), path);
res
}
} else {
hash_encode(&path)
}
}