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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/longmatch.c b/deps/libchdr/deps/zstd-1.5.5/tests/longmatch.c
new file mode 100644
index 00000000..547b2619
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/longmatch.c
@@ -0,0 +1,102 @@
+/*
+ * 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 <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "mem.h"
+#define ZSTD_STATIC_LINKING_ONLY
+#include "zstd.h"
+
+static int
+compress(ZSTD_CStream *ctx, ZSTD_outBuffer out, const void *data, size_t size)
+{
+  ZSTD_inBuffer in = { data, size, 0 };
+  while (in.pos < in.size) {
+    ZSTD_outBuffer tmp = out;
+    const size_t rc = ZSTD_compressStream(ctx, &tmp, &in);
+    if (ZSTD_isError(rc)) return 1;
+  }
+  { ZSTD_outBuffer tmp = out;
+    const size_t rc = ZSTD_flushStream(ctx, &tmp);
+    if (rc != 0) { return 1; }
+  }
+  return 0;
+}
+
+int main(int argc, const char** argv)
+{
+  ZSTD_CStream* ctx;
+  unsigned windowLog = 18;
+  (void)argc;
+  (void)argv;
+  /* Create stream */
+  ctx = ZSTD_createCCtx();
+  if (!ctx) { return 1; }
+  /* Set parameters */
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_windowLog, windowLog)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_chainLog, 13)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_hashLog, 14)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_searchLog, 1)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_minMatch, 7)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_targetLength, 16)))
+    return 2;
+  if (ZSTD_isError(ZSTD_CCtx_setParameter(ctx, ZSTD_c_strategy, ZSTD_fast)))
+    return 2;
+  {
+    U64 compressed = 0;
+    const U64 toCompress = ((U64)1) << 33;
+    const size_t size = 1 << windowLog;
+    size_t pos = 0;
+    char *srcBuffer = (char*) malloc(1 << windowLog);
+    char *dstBuffer = (char*) malloc(ZSTD_compressBound(1 << windowLog));
+    ZSTD_outBuffer out = { dstBuffer, ZSTD_compressBound(1 << windowLog), 0 };
+    const char match[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    const size_t randomData = (1 << windowLog) - 2*sizeof(match);
+    size_t i;
+    printf("\n ===   Long Match Test   === \n");
+    printf("Creating random data to produce long matches \n");
+    for (i = 0; i < sizeof(match); ++i) {
+      srcBuffer[i] = match[i];
+    }
+    for (i = 0; i < randomData; ++i) {
+      srcBuffer[sizeof(match) + i] = (char)(rand() & 0xFF);
+    }
+    for (i = 0; i < sizeof(match); ++i) {
+      srcBuffer[sizeof(match) + randomData + i] = match[i];
+    }
+    printf("Compressing, trying to generate a segfault \n");
+    if (compress(ctx, out, srcBuffer, size)) {
+      return 1;
+    }
+    compressed += size;
+    while (compressed < toCompress) {
+      const size_t block = rand() % (size - pos + 1);
+      if (pos == size) { pos = 0; }
+      if (compress(ctx, out, srcBuffer + pos, block)) {
+        return 1;
+      }
+      pos += block;
+      compressed += block;
+    }
+    printf("Compression completed successfully (no error triggered)\n");
+    free(srcBuffer);
+    free(dstBuffer);
+  }
+  ZSTD_freeCCtx(ctx);
+  return 0;
+}