Le 4 sept. 2025 à 10:27, Patrick Steinhardt [off-list ref] a écrit :

Implement a trivial test balloon for our Rust build infrastructure by
reimplementing the "varint.c" subsystem in Rust. This subsystem is
chosen because it is trivial to convert and because it doesn't have any
dependencies to other components of Git.

If support for Rust is enabled, we stop compiling "varint.c" and instead
compile and use "src/varint.rs".

Signed-off-by: Patrick Steinhardt <redacted>
---
meson.build     |  5 +++-
src/lib.rs      |  1 +
src/meson.build |  1 +
src/varint.rs   | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 98 insertions(+), 1 deletion(-)

diff --git a/src/varint.rs b/src/varint.rs
new file mode 100644
index 00000000000..3d41760a555
--- /dev/null
+++ b/src/varint.rs

@@ -0,0 +1,92 @@
+use std::os::raw::c_int;
+use std::os::raw::c_uchar;
+
+#[no_mangle]
+pub unsafe extern "C" fn decode_varint(bufp: *mut *const c_uchar) -> usize {
+    let mut buf = *bufp;
+    let mut c = *buf;
+    let mut val = usize::from(c & 127);
+
+    buf = buf.add(1);
+
+    while (c & 128) != 0 {
+        val += 1;
+        if val == 0 || val.leading_zeros() < 7 {
+            return 0; // overflow