1 files changed, 81 insertions, 0 deletions
diff --git a/vendor/gix-object/src/parse.rs b/vendor/gix-object/src/parse.rs
new file mode 100644
index 000000000..20dd443c0
--- /dev/null
+++ b/vendor/gix-object/src/parse.rs
@@ -0,0 +1,81 @@
+use bstr::{BStr, BString, ByteVec};
+use nom::{
+    bytes::complete::{is_not, tag, take_until, take_while_m_n},
+    combinator::{peek, recognize},
+    error::{context, ContextError, ParseError},
+    multi::many1_count,
+    sequence::{preceded, terminated, tuple},
+    IResult,
+};
+
+use crate::ByteSlice;
+
+pub(crate) const NL: &[u8] = b"\n";
+pub(crate) const SPACE: &[u8] = b" ";
+const SPACE_OR_NL: &[u8] = b" \n";
+
+pub(crate) fn any_header_field_multi_line<'a, E: ParseError<&'a [u8]> + ContextError<&'a [u8]>>(
+    i: &'a [u8],
+) -> IResult<&'a [u8], (&'a [u8], BString), E> {
+    let (i, (k, o)) = context(
+        "name <multi-line-value>",
+        peek(tuple((
+            terminated(is_not(SPACE_OR_NL), tag(SPACE)),
+            recognize(tuple((
+                is_not(NL),
+                tag(NL),
+                many1_count(terminated(tuple((tag(SPACE), take_until(NL))), tag(NL))),
+            ))),
+        ))),
+    )(i)?;
+    assert!(!o.is_empty(), "we have parsed more than one value here");
+    let end = &o[o.len() - 1] as *const u8 as usize;
+    let start_input = &i[0] as *const u8 as usize;
+
+    let bytes = o[..o.len() - 1].as_bstr();
+    let mut out = BString::from(Vec::with_capacity(bytes.len()));
+    let mut lines = bytes.lines();
+    out.push_str(lines.next().expect("first line"));
+    for line in lines {
+        out.push(b'\n');
+        out.push_str(&line[1..]); // cut leading space
+    }
+    Ok((&i[end - start_input + 1..], (k, out)))
+}
+
+pub(crate) fn header_field<'a, T, E: ParseError<&'a [u8]>>(
+    i: &'a [u8],
+    name: &'static [u8],
+    parse_value: impl Fn(&'a [u8]) -> IResult<&'a [u8], T, E>,
+) -> IResult<&'a [u8], T, E> {
+    terminated(preceded(terminated(tag(name), tag(SPACE)), parse_value), tag(NL))(i)
+}
+
+pub(crate) fn any_header_field<'a, T, E: ParseError<&'a [u8]>>(
+    i: &'a [u8],
+    parse_value: impl Fn(&'a [u8]) -> IResult<&'a [u8], T, E>,
+) -> IResult<&'a [u8], (&'a [u8], T), E> {
+    terminated(
+        tuple((terminated(is_not(SPACE_OR_NL), tag(SPACE)), parse_value)),
+        tag(NL),
+    )(i)
+}
+
+fn is_hex_digit_lc(b: u8) -> bool {
+    matches!(b, b'0'..=b'9' | b'a'..=b'f')
+}
+
+pub fn hex_hash<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], &'a BStr, E> {
+    take_while_m_n(
+        gix_hash::Kind::shortest().len_in_hex(),
+        gix_hash::Kind::longest().len_in_hex(),
+        is_hex_digit_lc,
+    )(i)
+    .map(|(i, hex)| (i, hex.as_bstr()))
+}
+
+pub(crate) fn signature<'a, E: ParseError<&'a [u8]> + ContextError<&'a [u8]>>(
+    i: &'a [u8],
+) -> IResult<&'a [u8], gix_actor::SignatureRef<'a>, E> {
+    gix_actor::signature::decode(i)
+}