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diff --git a/deps/libchdr/deps/zstd-1.5.5/build/single_file_libs/examples/roundtrip.c b/deps/libchdr/deps/zstd-1.5.5/build/single_file_libs/examples/roundtrip.c
new file mode 100644
index 00000000..b228de88
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/build/single_file_libs/examples/roundtrip.c
@@ -0,0 +1,83 @@
+/*
+ * \file roundtrip.c
+ * In this example we include \c zstd.h and compile separately the amalgamated
+ * \c zstd.c:
+ * \code
+ *	cc -Wall -Wextra -Werror -I. -Os -g0 zstd.c examples/roundtrip.c 
+ * \endcode
+ *
+ * \author Carl Woffenden, Numfum GmbH (released under a CC0 license)
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "zstd.h"
+
+//************************** Test Data (DXT texture) **************************/
+
+/**
+ * Raw test data (borrowed from the Emscripten example).
+ * \n
+ * See \c testcard.png for the original.
+ */
+static uint8_t const rawData[] = {
+#include "testcard-dxt1.inl"
+};
+
+#ifndef ZSTD_VERSION_MAJOR
+/*
+ * For the case where the decompression library hasn't been included we add
+ * dummy functions to fake the process and stop the buffers being optimised out.
+ */
+size_t ZSTD_compressBound(size_t maxSrc) {
+	return maxSrc + 32;
+}
+int ZSTD_maxCLevel(void) {
+	return 20;
+}
+size_t ZSTD_compress(void* dst, size_t dstLen, const void* src, size_t srcLen, int level) {
+	return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? level : dstLen;
+}
+unsigned ZSTD_isError(size_t code) {
+	return ((int) code) < 0;
+}
+size_t ZSTD_decompress(void* dst, size_t dstLen, const void* src, size_t srcLen) {
+	return (memcmp(dst, src, (srcLen < dstLen) ? srcLen : dstLen)) ? 0 : dstLen;
+}
+#endif
+
+//*****************************************************************************/
+
+/**
+ * Simple single-file test to compress \c rawData, decompress the result, then
+ * compare the decompressed version with the original.
+ */
+int main() {
+	size_t bounds = ZSTD_compressBound(sizeof rawData);
+	void* compBuf = malloc(bounds);
+	void* testBuf = malloc(sizeof rawData);
+	int compare   = -1;
+	if (compBuf && testBuf) {
+		size_t compSize = ZSTD_compress(compBuf, bounds, rawData, sizeof rawData, ZSTD_maxCLevel());
+		if (!ZSTD_isError(compSize)) {
+			printf("Compression: PASSED (size: %lu, uncompressed: %lu)\n", (unsigned long) compSize, (unsigned long) (sizeof rawData));
+			size_t decSize = ZSTD_decompress(testBuf, sizeof rawData, compBuf, compSize);
+			if (!ZSTD_isError(decSize)) {
+				printf("Decompression: PASSED\n");
+				compare = memcmp(rawData, testBuf, decSize);
+				printf("Byte comparison: %s\n", (compare == 0) ? "PASSED" : "FAILED");
+			} else {
+				printf("Decompression: FAILED\n");
+			}
+		} else {
+			printf("Compression: FAILED\n");
+		}
+		free(compBuf);
+		free(testBuf);
+	}
+	return (compare == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
+}