Import asn1-rs-impl crate.upstream

Request Document: go/android-rust-importing-crates
For CL Reviewers: go/android3p#cl-review
For Build Team: go/ab-third-party-imports
Bug: 312436741
Test: Treehugger

Change-Id: Ie6e96450b8bd28dfaec21f2a9af7d3827af8c2ca

13 files changed, 465 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..b1776ad
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "78620ca0954d44ddc57d0280d0072dfbd8566de4"
+  },
+  "path_in_vcs": "impl"
+}
\ No newline at end of file
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..f0404b9
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,19 @@
+// This file is generated by cargo_embargo.
+// Do not modify this file as changes will be overridden on upgrade.
+
+// TODO: Add license.
+rust_proc_macro {
+    name: "libasn1_rs_impl",
+    crate_name: "asn1_rs_impl",
+    cargo_env_compat: true,
+    cargo_pkg_version: "0.1.0",
+    srcs: ["src/lib.rs"],
+    edition: "2018",
+    rustlibs: [
+        "libproc_macro2",
+        "libquote",
+        "libsyn",
+    ],
+    product_available: true,
+    vendor_available: true,
+}
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..261b72f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,31 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "asn1-rs-impl"
+version = "0.1.0"
+authors = ["Pierre Chifflier <chifflier@wzdftpd.net>"]
+description = "Implementation details for the `asn1-rs` crate"
+homepage = "https://github.com/rusticata/asn1-rs"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/rusticata/asn1-rs.git"
+
+[lib]
+proc-macro = true
+[dependencies.proc-macro2]
+version = "1"
+
+[dependencies.quote]
+version = "1"
+
+[dependencies.syn]
+version = "1"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..0ed5112
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,17 @@
+[package]
+name = "asn1-rs-impl"
+version = "0.1.0"
+authors = ["Pierre Chifflier <chifflier@wzdftpd.net>"]
+description = "Implementation details for the `asn1-rs` crate"
+license = "MIT/Apache-2.0"
+homepage = "https://github.com/rusticata/asn1-rs"
+repository = "https://github.com/rusticata/asn1-rs.git"
+edition = "2018"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1"
+quote = "1"
+syn = "1"
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..6b579aa
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+LICENSE-APACHE
\ No newline at end of file
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..290e7b9
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2017 Pierre Chifflier
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..90e8400
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,20 @@
+name: "asn1-rs-impl"
+description: "Implementation details for the `asn1-rs` crate"
+third_party {
+  identifier {
+    type: "crates.io"
+    value: "https://crates.io/crates/asn1-rs-impl"
+  }
+  identifier {
+    type: "Archive"
+    value: "https://static.crates.io/crates/asn1-rs-impl/asn1-rs-impl-0.1.0.crate"
+  }
+  version: "0.1.0"
+  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2023
+    month: 11
+    day: 21
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..5a2b844
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:main:/OWNERS
diff --git a/cargo_embargo.json b/cargo_embargo.json
new file mode 100644
index 0000000..fca634f
--- /dev/null
+++ b/cargo_embargo.json
@@ -0,0 +1,3 @@
+{
+    "run_cargo": false
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ea635cc
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,126 @@
+extern crate proc_macro;
+use proc_macro::{Span, TokenStream};
+use syn::{parse_macro_input, Error, LitInt};
+
+#[proc_macro]
+pub fn encode_oid(input: TokenStream) -> TokenStream {
+    let token_stream = input.to_string();
+    let (s, relative) = if token_stream.starts_with("rel ") {
+        (&token_stream[4..], true)
+    } else {
+        (token_stream.as_ref(), false)
+    };
+    let items: Result<Vec<_>, _> = s.split('.').map(|x| x.trim().parse::<u128>()).collect();
+    let mut items: &[_] = match items.as_ref() {
+        Ok(v) => v.as_ref(),
+        Err(_) => return create_error("Could not parse OID"),
+    };
+    let mut v = Vec::new();
+    if !relative {
+        if items.len() < 2 {
+            if items.len() == 1 && items[0] == 0 {
+                return "[0]".parse().unwrap();
+            }
+            return create_error("Need at least two components for non-relative oid");
+        }
+        if items[0] > 2 || items[1] > 39 {
+            return create_error("First components are too big");
+        }
+        let first_byte = (items[0] * 40 + items[1]) as u8;
+        v.push(first_byte);
+        items = &items[2..];
+    }
+    for &int in items {
+        let enc = encode_base128(int);
+        v.extend_from_slice(&enc);
+    }
+    // "fn answer() -> u32 { 42 }".parse().unwrap()
+    let mut s = String::with_capacity(2 + 6 * v.len());
+    s.push('[');
+    for byte in v.iter() {
+        s.insert_str(s.len(), &format!("0x{:02x}, ", byte));
+    }
+    s.push(']');
+    s.parse().unwrap()
+}
+
+#[inline]
+fn create_error(msg: &str) -> TokenStream {
+    let s = format!("Invalid OID({})", msg);
+    Error::new(Span::call_site().into(), &s)
+        .to_compile_error()
+        .into()
+}
+
+// encode int as base128
+fn encode_base128(int: u128) -> Vec<u8> {
+    let mut val = int;
+    let mut base128 = Vec::new();
+    let lo = val & 0x7f;
+    base128.push(lo as u8);
+    val >>= 7;
+    loop {
+        if val == 0 {
+            base128.reverse();
+            return base128;
+        }
+        let lo = val & 0x7f;
+        base128.push(lo as u8 | 0x80);
+        val >>= 7;
+    }
+}
+
+#[proc_macro]
+pub fn encode_int(input: TokenStream) -> TokenStream {
+    let lit = parse_macro_input!(input as LitInt);
+
+    match impl_encode_int(lit) {
+        Ok(ts) => ts,
+        Err(e) => e.to_compile_error().into(),
+    }
+
+    // let token_stream = input.to_string();
+    // let items: Result<Vec<_>, _> = token_stream
+    //     .split('.')
+    //     .map(|x| x.trim().parse::<u64>())
+    //     .collect();
+    // let err = Error::new(Span::call_site().into(), "invalid OID");
+    // if let Ok(items) = items {
+    //     let mut v = Vec::new();
+    //     if items.len() < 2 || items[0] > 2 || items[1] > 39 {
+    //         return err.to_compile_error().into();
+    //     }
+    //     let first_byte = (items[0] * 40 + items[1]) as u8;
+    //     v.push(first_byte);
+    //     for &int in &items[2..] {
+    //         let enc = encode_base128(int);
+    //         v.extend_from_slice(&enc);
+    //     }
+    //     // "fn answer() -> u32 { 42 }".parse().unwrap()
+    //     let mut s = String::with_capacity(2 + 6 * v.len());
+    //     s.push('[');
+    //     for byte in v.iter() {
+    //         s.insert_str(s.len(), &format!("0x{:02x}, ", byte));
+    //     }
+    //     s.push(']');
+    //     s.parse().unwrap()
+    // } else {
+    //     eprintln!("could not parse OID '{}'", token_stream);
+    //     err.to_compile_error().into()
+    // }
+}
+
+fn impl_encode_int(lit: LitInt) -> Result<TokenStream, Error> {
+    let value = lit.base10_parse::<u64>()?;
+
+    let bytes = value.to_be_bytes();
+    let v: Vec<_> = bytes.iter().skip_while(|&c| *c == 0).collect();
+
+    let mut s = String::with_capacity(2 + 6 * v.len());
+    s.push('[');
+    for byte in v.iter() {
+        s.insert_str(s.len(), &format!("0x{:02x}, ", byte));
+    }
+    s.push(']');
+    Ok(s.parse().unwrap())
+}
diff --git a/tests/test_oid.rs b/tests/test_oid.rs
new file mode 100644
index 0000000..b85d622
--- /dev/null
+++ b/tests/test_oid.rs
@@ -0,0 +1,15 @@
+use asn1_rs_impl::{encode_int, encode_oid};
+
+#[test]
+fn test_encode_oid() {
+    // example from http://luca.ntop.org/Teaching/Appunti/asn1.html
+    let oid = encode_oid! {1.2.840.113549};
+    assert_eq!(oid, [0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d]);
+}
+
+#[test]
+fn test_encode_int() {
+    //
+    let int = encode_int!(1234);
+    assert_eq!(int, [0x04, 0xd2]);
+}