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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/poolTests.c b/deps/libchdr/deps/zstd-1.5.5/tests/poolTests.c
new file mode 100644
index 00000000..9e62722b
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/poolTests.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+
+#include "pool.h"
+#include "threading.h"
+#include "util.h"
+#include "timefn.h"
+#include <stddef.h>
+#include <stdio.h>
+
+#define ASSERT_TRUE(p)                                                       \
+  do {                                                                       \
+    if (!(p)) {                                                              \
+      return 1;                                                              \
+    }                                                                        \
+  } while (0)
+#define ASSERT_FALSE(p) ASSERT_TRUE(!(p))
+#define ASSERT_EQ(lhs, rhs) ASSERT_TRUE((lhs) == (rhs))
+
+struct data {
+  ZSTD_pthread_mutex_t mutex;
+  unsigned data[16];
+  size_t i;
+};
+
+static void fn(void *opaque)
+{
+  struct data *data = (struct data *)opaque;
+  ZSTD_pthread_mutex_lock(&data->mutex);
+  data->data[data->i] = (unsigned)(data->i);
+  ++data->i;
+  ZSTD_pthread_mutex_unlock(&data->mutex);
+}
+
+static int testOrder(size_t numThreads, size_t queueSize)
+{
+  struct data data;
+  POOL_ctx* const ctx = POOL_create(numThreads, queueSize);
+  ASSERT_TRUE(ctx);
+  data.i = 0;
+  ASSERT_FALSE(ZSTD_pthread_mutex_init(&data.mutex, NULL));
+  { size_t i;
+    for (i = 0; i < 16; ++i) {
+      POOL_add(ctx, &fn, &data);
+    }
+  }
+  POOL_free(ctx);
+  ASSERT_EQ(16, data.i);
+  { size_t i;
+    for (i = 0; i < data.i; ++i) {
+      ASSERT_EQ(i, data.data[i]);
+    }
+  }
+  ZSTD_pthread_mutex_destroy(&data.mutex);
+  return 0;
+}
+
+
+/* --- test deadlocks --- */
+
+static void waitFn(void *opaque) {
+  (void)opaque;
+  UTIL_sleepMilli(1);
+}
+
+/* Tests for deadlock */
+static int testWait(size_t numThreads, size_t queueSize) {
+  struct data data;
+  POOL_ctx* const ctx = POOL_create(numThreads, queueSize);
+  ASSERT_TRUE(ctx);
+  { size_t i;
+    for (i = 0; i < 16; ++i) {
+        POOL_add(ctx, &waitFn, &data);
+    }
+  }
+  POOL_free(ctx);
+  return 0;
+}
+
+
+/* --- test POOL_resize() --- */
+
+typedef struct {
+    ZSTD_pthread_mutex_t mut;
+    int countdown;
+    int val;
+    int max;
+    ZSTD_pthread_cond_t cond;
+} poolTest_t;
+
+static void waitLongFn(void *opaque) {
+  poolTest_t* const test = (poolTest_t*) opaque;
+  ZSTD_pthread_mutex_lock(&test->mut);
+  test->val++;
+  if (test->val > test->max)
+      test->max = test->val;
+  ZSTD_pthread_mutex_unlock(&test->mut);
+
+  UTIL_sleepMilli(10);
+
+  ZSTD_pthread_mutex_lock(&test->mut);
+  test->val--;
+  test->countdown--;
+  if (test->countdown == 0)
+      ZSTD_pthread_cond_signal(&test->cond);
+  ZSTD_pthread_mutex_unlock(&test->mut);
+}
+
+static int testThreadReduction_internal(POOL_ctx* ctx, poolTest_t test)
+{
+    int const nbWaits = 16;
+
+    test.countdown = nbWaits;
+    test.val = 0;
+    test.max = 0;
+
+    {   int i;
+        for (i=0; i<nbWaits; i++)
+            POOL_add(ctx, &waitLongFn, &test);
+    }
+    ZSTD_pthread_mutex_lock(&test.mut);
+    while (test.countdown > 0)
+        ZSTD_pthread_cond_wait(&test.cond, &test.mut);
+    ASSERT_EQ(test.val, 0);
+    ASSERT_EQ(test.max, 4);
+    ZSTD_pthread_mutex_unlock(&test.mut);
+
+    ASSERT_EQ( POOL_resize(ctx, 2/*nbThreads*/) , 0 );
+    test.countdown = nbWaits;
+    test.val = 0;
+    test.max = 0;
+    {   int i;
+        for (i=0; i<nbWaits; i++)
+            POOL_add(ctx, &waitLongFn, &test);
+    }
+    ZSTD_pthread_mutex_lock(&test.mut);
+    while (test.countdown > 0)
+        ZSTD_pthread_cond_wait(&test.cond, &test.mut);
+    ASSERT_EQ(test.val, 0);
+    ASSERT_EQ(test.max, 2);
+    ZSTD_pthread_mutex_unlock(&test.mut);
+
+    return 0;
+}
+
+static int testThreadReduction(void) {
+    int result;
+    poolTest_t test;
+    POOL_ctx* const ctx = POOL_create(4 /*nbThreads*/, 2 /*queueSize*/);
+
+    ASSERT_TRUE(ctx);
+
+    memset(&test, 0, sizeof(test));
+    ASSERT_FALSE( ZSTD_pthread_mutex_init(&test.mut, NULL) );
+    ASSERT_FALSE( ZSTD_pthread_cond_init(&test.cond, NULL) );
+
+    result = testThreadReduction_internal(ctx, test);
+
+    ZSTD_pthread_mutex_destroy(&test.mut);
+    ZSTD_pthread_cond_destroy(&test.cond);
+    POOL_free(ctx);
+
+    return result;
+}
+
+
+/* --- test abrupt ending --- */
+
+typedef struct {
+    ZSTD_pthread_mutex_t mut;
+    int val;
+} abruptEndCanary_t;
+
+static void waitIncFn(void *opaque) {
+  abruptEndCanary_t* test = (abruptEndCanary_t*) opaque;
+  UTIL_sleepMilli(10);
+  ZSTD_pthread_mutex_lock(&test->mut);
+  test->val = test->val + 1;
+  ZSTD_pthread_mutex_unlock(&test->mut);
+}
+
+static int testAbruptEnding_internal(abruptEndCanary_t test)
+{
+    int const nbWaits = 16;
+
+    POOL_ctx* const ctx = POOL_create(3 /*numThreads*/, nbWaits /*queueSize*/);
+    ASSERT_TRUE(ctx);
+    test.val = 0;
+
+    {   int i;
+        for (i=0; i<nbWaits; i++)
+            POOL_add(ctx, &waitIncFn, &test);  /* all jobs pushed into queue */
+    }
+    ASSERT_EQ( POOL_resize(ctx, 1 /*numThreads*/) , 0 );   /* downsize numThreads, to try to break end condition */
+
+    POOL_free(ctx);  /* must finish all jobs in queue before giving back control */
+    ASSERT_EQ(test.val, nbWaits);
+    return 0;
+}
+
+static int testAbruptEnding(void) {
+    int result;
+    abruptEndCanary_t test;
+
+    memset(&test, 0, sizeof(test));
+    ASSERT_FALSE( ZSTD_pthread_mutex_init(&test.mut, NULL) );
+
+    result = testAbruptEnding_internal(test);
+
+    ZSTD_pthread_mutex_destroy(&test.mut);
+    return result;
+}
+
+
+
+/* --- test launcher --- */
+
+int main(int argc, const char **argv) {
+  size_t numThreads;
+  (void)argc;
+  (void)argv;
+
+  if (POOL_create(0, 1)) {   /* should not be possible */
+    printf("FAIL: should not create POOL with 0 threads\n");
+    return 1;
+  }
+
+  for (numThreads = 1; numThreads <= 4; ++numThreads) {
+    size_t queueSize;
+    for (queueSize = 0; queueSize <= 2; ++queueSize) {
+      printf("queueSize==%u, numThreads=%u \n",
+            (unsigned)queueSize, (unsigned)numThreads);
+      if (testOrder(numThreads, queueSize)) {
+        printf("FAIL: testOrder\n");
+        return 1;
+      }
+      printf("SUCCESS: testOrder\n");
+      if (testWait(numThreads, queueSize)) {
+        printf("FAIL: testWait\n");
+        return 1;
+      }
+      printf("SUCCESS: testWait\n");
+    }
+  }
+
+  if (testThreadReduction()) {
+      printf("FAIL: thread reduction not effective \n");
+      return 1;
+  } else {
+      printf("SUCCESS: thread reduction effective \n");
+  }
+
+  if (testAbruptEnding()) {
+      printf("FAIL: jobs in queue not completed on early end \n");
+      return 1;
+  } else {
+      printf("SUCCESS: all jobs in queue completed on early end \n");
+  }
+
+  printf("PASS: all POOL tests\n");
+
+  return 0;
+}