1 files changed, 161 insertions, 0 deletions
diff --git a/third_party/rust/base64/tests/tests.rs b/third_party/rust/base64/tests/tests.rs
new file mode 100644
index 0000000000..eceff40d6a
--- /dev/null
+++ b/third_party/rust/base64/tests/tests.rs
@@ -0,0 +1,161 @@
+use rand::{Rng, SeedableRng};
+
+use base64::engine::{general_purpose::STANDARD, Engine};
+use base64::*;
+
+use base64::engine::general_purpose::{GeneralPurpose, NO_PAD};
+
+// generate random contents of the specified length and test encode/decode roundtrip
+fn roundtrip_random<E: Engine>(
+    byte_buf: &mut Vec<u8>,
+    str_buf: &mut String,
+    engine: &E,
+    byte_len: usize,
+    approx_values_per_byte: u8,
+    max_rounds: u64,
+) {
+    // let the short ones be short but don't let it get too crazy large
+    let num_rounds = calculate_number_of_rounds(byte_len, approx_values_per_byte, max_rounds);
+    let mut r = rand::rngs::SmallRng::from_entropy();
+    let mut decode_buf = Vec::new();
+
+    for _ in 0..num_rounds {
+        byte_buf.clear();
+        str_buf.clear();
+        decode_buf.clear();
+        while byte_buf.len() < byte_len {
+            byte_buf.push(r.gen::<u8>());
+        }
+
+        engine.encode_string(&byte_buf, str_buf);
+        engine.decode_vec(&str_buf, &mut decode_buf).unwrap();
+
+        assert_eq!(byte_buf, &decode_buf);
+    }
+}
+
+fn calculate_number_of_rounds(byte_len: usize, approx_values_per_byte: u8, max: u64) -> u64 {
+    // don't overflow
+    let mut prod = approx_values_per_byte as u64;
+
+    for _ in 0..byte_len {
+        if prod > max {
+            return max;
+        }
+
+        prod = prod.saturating_mul(prod);
+    }
+
+    prod
+}
+
+#[test]
+fn roundtrip_random_short_standard() {
+    let mut byte_buf: Vec<u8> = Vec::new();
+    let mut str_buf = String::new();
+
+    for input_len in 0..40 {
+        roundtrip_random(&mut byte_buf, &mut str_buf, &STANDARD, input_len, 4, 10000);
+    }
+}
+
+#[test]
+fn roundtrip_random_with_fast_loop_standard() {
+    let mut byte_buf: Vec<u8> = Vec::new();
+    let mut str_buf = String::new();
+
+    for input_len in 40..100 {
+        roundtrip_random(&mut byte_buf, &mut str_buf, &STANDARD, input_len, 4, 1000);
+    }
+}
+
+#[test]
+fn roundtrip_random_short_no_padding() {
+    let mut byte_buf: Vec<u8> = Vec::new();
+    let mut str_buf = String::new();
+
+    let engine = GeneralPurpose::new(&alphabet::STANDARD, NO_PAD);
+    for input_len in 0..40 {
+        roundtrip_random(&mut byte_buf, &mut str_buf, &engine, input_len, 4, 10000);
+    }
+}
+
+#[test]
+fn roundtrip_random_no_padding() {
+    let mut byte_buf: Vec<u8> = Vec::new();
+    let mut str_buf = String::new();
+
+    let engine = GeneralPurpose::new(&alphabet::STANDARD, NO_PAD);
+
+    for input_len in 40..100 {
+        roundtrip_random(&mut byte_buf, &mut str_buf, &engine, input_len, 4, 1000);
+    }
+}
+
+#[test]
+fn roundtrip_decode_trailing_10_bytes() {
+    // This is a special case because we decode 8 byte blocks of input at a time as much as we can,
+    // ideally unrolled to 32 bytes at a time, in stages 1 and 2. Since we also write a u64's worth
+    // of bytes (8) to the output, we always write 2 garbage bytes that then will be overwritten by
+    // the NEXT block. However, if the next block only contains 2 bytes, it will decode to 1 byte,
+    // and therefore be too short to cover up the trailing 2 garbage bytes. Thus, we have stage 3
+    // to handle that case.
+
+    for num_quads in 0..25 {
+        let mut s: String = "ABCD".repeat(num_quads);
+        s.push_str("EFGHIJKLZg");
+
+        let engine = GeneralPurpose::new(&alphabet::STANDARD, NO_PAD);
+        let decoded = engine.decode(&s).unwrap();
+        assert_eq!(num_quads * 3 + 7, decoded.len());
+
+        assert_eq!(s, engine.encode(&decoded));
+    }
+}
+
+#[test]
+fn display_wrapper_matches_normal_encode() {
+    let mut bytes = Vec::<u8>::with_capacity(256);
+
+    for i in 0..255 {
+        bytes.push(i);
+    }
+    bytes.push(255);
+
+    assert_eq!(
+        STANDARD.encode(&bytes),
+        format!("{}", display::Base64Display::new(&bytes, &STANDARD))
+    );
+}
+
+#[test]
+fn encode_engine_slice_error_when_buffer_too_small() {
+    for num_triples in 1..100 {
+        let input = "AAA".repeat(num_triples);
+        let mut vec = vec![0; (num_triples - 1) * 4];
+        assert_eq!(
+            EncodeSliceError::OutputSliceTooSmall,
+            STANDARD.encode_slice(&input, &mut vec).unwrap_err()
+        );
+        vec.push(0);
+        assert_eq!(
+            EncodeSliceError::OutputSliceTooSmall,
+            STANDARD.encode_slice(&input, &mut vec).unwrap_err()
+        );
+        vec.push(0);
+        assert_eq!(
+            EncodeSliceError::OutputSliceTooSmall,
+            STANDARD.encode_slice(&input, &mut vec).unwrap_err()
+        );
+        vec.push(0);
+        assert_eq!(
+            EncodeSliceError::OutputSliceTooSmall,
+            STANDARD.encode_slice(&input, &mut vec).unwrap_err()
+        );
+        vec.push(0);
+        assert_eq!(
+            num_triples * 4,
+            STANDARD.encode_slice(&input, &mut vec).unwrap()
+        );
+    }
+}