From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc | 98 +++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc

(limited to 'third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc')

diff --git a/third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc b/third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc
new file mode 100644
index 0000000000..acda762545
--- /dev/null
+++ b/third_party/jpeg-xl/lib/jxl/lehmer_code_test.cc
@@ -0,0 +1,98 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/lehmer_code.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include <algorithm>
+#include <numeric>
+#include <vector>
+
+#include "lib/jxl/base/bits.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/random.h"
+#include "lib/jxl/test_utils.h"
+#include "lib/jxl/testing.h"
+
+namespace jxl {
+namespace {
+
+template <typename PermutationT>
+struct WorkingSet {
+  explicit WorkingSet(size_t max_n)
+      : padded_n(1ull << CeilLog2Nonzero(max_n + 1)),
+        permutation(max_n),
+        temp(padded_n),
+        lehmer(max_n),
+        decoded(max_n) {}
+
+  size_t padded_n;
+  std::vector<PermutationT> permutation;
+  std::vector<uint32_t> temp;
+  std::vector<LehmerT> lehmer;
+  std::vector<PermutationT> decoded;
+};
+
+template <typename PermutationT>
+void Roundtrip(size_t n, WorkingSet<PermutationT>* ws) {
+  JXL_ASSERT(n != 0);
+  const size_t padded_n = 1ull << CeilLog2Nonzero(n);
+
+  Rng rng(n * 65537 + 13);
+
+  // Ensure indices fit into PermutationT
+  EXPECT_LE(n, 1ULL << (sizeof(PermutationT) * 8));
+
+  std::iota(ws->permutation.begin(), ws->permutation.begin() + n, 0);
+
+  // For various random permutations:
+  for (size_t rep = 0; rep < 3; ++rep) {
+    rng.Shuffle(ws->permutation.data(), n);
+
+    // Must decode to the same permutation
+    ComputeLehmerCode(ws->permutation.data(), ws->temp.data(), n,
+                      ws->lehmer.data());
+    memset(ws->temp.data(), 0, padded_n * 4);
+    DecodeLehmerCode(ws->lehmer.data(), ws->temp.data(), n, ws->decoded.data());
+
+    for (size_t i = 0; i < n; ++i) {
+      EXPECT_EQ(ws->permutation[i], ws->decoded[i]);
+    }
+  }
+}
+
+// Preallocates arrays and tests n = [begin, end).
+template <typename PermutationT>
+void RoundtripSizeRange(ThreadPool* pool, uint32_t begin, uint32_t end) {
+  ASSERT_NE(0u, begin);  // n = 0 not allowed.
+  std::vector<WorkingSet<PermutationT>> working_sets;
+
+  JXL_CHECK(RunOnPool(
+      pool, begin, end,
+      [&working_sets, end](const size_t num_threads) {
+        for (size_t i = 0; i < num_threads; i++) {
+          working_sets.emplace_back(end - 1);
+        }
+        return true;
+      },
+      [&working_sets](const uint32_t n, const size_t thread) {
+        Roundtrip(n, &working_sets[thread]);
+      },
+      "lehmer test"));
+}
+
+TEST(LehmerCodeTest, TestRoundtrips) {
+  test::ThreadPoolForTests pool(8);
+
+  RoundtripSizeRange<uint16_t>(&pool, 1, 1026);
+
+  // Ensures PermutationT can fit > 16 bit values.
+  RoundtripSizeRange<uint32_t>(&pool, 65536, 65540);
+}
+
+}  // namespace
+}  // namespace jxl
-- 
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