1 files changed, 97 insertions, 0 deletions
diff --git a/neozip/test/benchmarks/benchmark_uncompress.cc b/neozip/test/benchmarks/benchmark_uncompress.cc
new file mode 100644
index 0000000000..6a82c05d01
--- /dev/null
+++ b/neozip/test/benchmarks/benchmark_uncompress.cc
@@ -0,0 +1,97 @@
+/* benchmark_uncompress.cc -- benchmark uncompress()
+ * Copyright (C) 2024-2025 Hans Kristian Rosbach
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <benchmark/benchmark.h>
+
+extern "C" {
+#  include "zbuild.h"
+#  include "zutil_p.h"
+#  if defined(ZLIB_COMPAT)
+#    include "zlib.h"
+#  else
+#    include "zlib-ng.h"
+#  endif
+#  include "test/compressible_data_p.h"
+}
+
+#define MAX_SIZE (1024 * 1024)
+#define NUM_TESTS 6
+
+class uncompress_bench: public benchmark::Fixture {
+private:
+    uint8_t *inbuff;
+    uint8_t *outbuff;
+    uint8_t *compressed_buff[NUM_TESTS];
+    z_uintmax_t compressed_sizes[NUM_TESTS];
+    uint32_t sizes[NUM_TESTS] = {1, 64, 1024, 16384, 128*1024, 1024*1024};
+
+public:
+    void SetUp(::benchmark::State& state) {
+        outbuff = (uint8_t *)malloc(MAX_SIZE + 16);
+        if (outbuff == NULL) {
+            state.SkipWithError("malloc failed");
+            return;
+        }
+
+        // Initialize input buffer with highly compressible data, interspersed
+        // with small amounts of random data and 3-byte matches.
+        inbuff = gen_compressible_data(MAX_SIZE);
+        if (inbuff == NULL) {
+            free(outbuff);
+            outbuff = NULL;
+            state.SkipWithError("gen_compressible_data() failed");
+            return;
+        }
+
+        // Compress data into different buffers
+        for (int i = 0; i < NUM_TESTS; ++i) {
+            compressed_buff[i] = (uint8_t *)zng_alloc(sizes[i] + 64);
+            assert(compressed_buff[i] != NULL);
+
+            z_uintmax_t compressed_size = sizes[i] + 64;
+            int err = PREFIX(compress2)(compressed_buff[i], &compressed_size, inbuff, sizes[i], Z_BEST_COMPRESSION);
+            if (err != Z_OK) {
+                fprintf(stderr, "compress() failed with error %d\n", err);
+                abort();
+            }
+            compressed_sizes[i] = compressed_size;
+        }
+    }
+
+    void Bench(benchmark::State& state) {
+        int err;
+
+        for (auto _ : state) {
+            int index = 0;
+            while (sizes[index] != (uint32_t)state.range(0)) ++index;
+
+            z_uintmax_t out_size = MAX_SIZE;
+            err = PREFIX(uncompress)(outbuff, &out_size, compressed_buff[index], compressed_sizes[index]);
+            if (err != Z_OK) {
+                fprintf(stderr, "uncompress() failed with error %d\n", err);
+                abort();
+            }
+        }
+    }
+
+    void TearDown(const ::benchmark::State&) {
+        free(inbuff);
+        free(outbuff);
+
+        for (int i = 0; i < NUM_TESTS; ++i) {
+            zng_free(compressed_buff[i]);
+        }
+    }
+};
+
+#define BENCHMARK_UNCOMPRESS(name) \
+    BENCHMARK_DEFINE_F(uncompress_bench, name)(benchmark::State& state) { \
+        Bench(state); \
+    } \
+    BENCHMARK_REGISTER_F(uncompress_bench, name)->Arg(1)->Arg(64)->Arg(1024)->Arg(16<<10)->Arg(128<<10)->Arg(1024<<10);
+
+BENCHMARK_UNCOMPRESS(uncompress_bench);