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diff --git a/deps/libchdr/deps/zstd-1.5.5/contrib/seekable_format/examples/seekable_compression.c b/deps/libchdr/deps/zstd-1.5.5/contrib/seekable_format/examples/seekable_compression.c
new file mode 100644
index 00000000..c3d227dd
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/contrib/seekable_format/examples/seekable_compression.c
@@ -0,0 +1,136 @@
+/*
+ * 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).
+ */
+
+#include <stdlib.h>    // malloc, free, exit, atoi
+#include <stdio.h>     // fprintf, perror, feof, fopen, etc.
+#include <string.h>    // strlen, memset, strcat
+#define ZSTD_STATIC_LINKING_ONLY
+#include <zstd.h>      // presumes zstd library is installed
+
+#include "../zstd_seekable.h"
+
+static void* malloc_orDie(size_t size)
+{
+    void* const buff = malloc(size);
+    if (buff) return buff;
+    /* error */
+    perror("malloc:");
+    exit(1);
+}
+
+static FILE* fopen_orDie(const char *filename, const char *instruction)
+{
+    FILE* const inFile = fopen(filename, instruction);
+    if (inFile) return inFile;
+    /* error */
+    perror(filename);
+    exit(3);
+}
+
+static size_t fread_orDie(void* buffer, size_t sizeToRead, FILE* file)
+{
+    size_t const readSize = fread(buffer, 1, sizeToRead, file);
+    if (readSize == sizeToRead) return readSize;   /* good */
+    if (feof(file)) return readSize;   /* good, reached end of file */
+    /* error */
+    perror("fread");
+    exit(4);
+}
+
+static size_t fwrite_orDie(const void* buffer, size_t sizeToWrite, FILE* file)
+{
+    size_t const writtenSize = fwrite(buffer, 1, sizeToWrite, file);
+    if (writtenSize == sizeToWrite) return sizeToWrite;   /* good */
+    /* error */
+    perror("fwrite");
+    exit(5);
+}
+
+static size_t fclose_orDie(FILE* file)
+{
+    if (!fclose(file)) return 0;
+    /* error */
+    perror("fclose");
+    exit(6);
+}
+
+static void compressFile_orDie(const char* fname, const char* outName, int cLevel, unsigned frameSize)
+{
+    FILE* const fin  = fopen_orDie(fname, "rb");
+    FILE* const fout = fopen_orDie(outName, "wb");
+    size_t const buffInSize = ZSTD_CStreamInSize();    /* can always read one full block */
+    void*  const buffIn  = malloc_orDie(buffInSize);
+    size_t const buffOutSize = ZSTD_CStreamOutSize();  /* can always flush a full block */
+    void*  const buffOut = malloc_orDie(buffOutSize);
+
+    ZSTD_seekable_CStream* const cstream = ZSTD_seekable_createCStream();
+    if (cstream==NULL) { fprintf(stderr, "ZSTD_seekable_createCStream() error \n"); exit(10); }
+    size_t const initResult = ZSTD_seekable_initCStream(cstream, cLevel, 1, frameSize);
+    if (ZSTD_isError(initResult)) { fprintf(stderr, "ZSTD_seekable_initCStream() error : %s \n", ZSTD_getErrorName(initResult)); exit(11); }
+
+    size_t read, toRead = buffInSize;
+    while( (read = fread_orDie(buffIn, toRead, fin)) ) {
+        ZSTD_inBuffer input = { buffIn, read, 0 };
+        while (input.pos < input.size) {
+            ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
+            toRead = ZSTD_seekable_compressStream(cstream, &output , &input);   /* toRead is guaranteed to be <= ZSTD_CStreamInSize() */
+            if (ZSTD_isError(toRead)) { fprintf(stderr, "ZSTD_seekable_compressStream() error : %s \n", ZSTD_getErrorName(toRead)); exit(12); }
+            if (toRead > buffInSize) toRead = buffInSize;   /* Safely handle case when `buffInSize` is manually changed to a value < ZSTD_CStreamInSize()*/
+            fwrite_orDie(buffOut, output.pos, fout);
+        }
+    }
+
+    while (1) {
+        ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
+        size_t const remainingToFlush = ZSTD_seekable_endStream(cstream, &output);   /* close stream */
+        if (ZSTD_isError(remainingToFlush)) { fprintf(stderr, "ZSTD_seekable_endStream() error : %s \n", ZSTD_getErrorName(remainingToFlush)); exit(13); }
+        fwrite_orDie(buffOut, output.pos, fout);
+        if (!remainingToFlush) break;
+    }
+
+    ZSTD_seekable_freeCStream(cstream);
+    fclose_orDie(fout);
+    fclose_orDie(fin);
+    free(buffIn);
+    free(buffOut);
+}
+
+static char* createOutFilename_orDie(const char* filename)
+{
+    size_t const inL = strlen(filename);
+    size_t const outL = inL + 5;
+    void* outSpace = malloc_orDie(outL);
+    memset(outSpace, 0, outL);
+    strcat(outSpace, filename);
+    strcat(outSpace, ".zst");
+    return (char*)outSpace;
+}
+
+#define CLEVEL_DEFAULT 5
+int main(int argc, const char** argv)
+{
+    const char* const exeName = argv[0];
+    if (argc<3 || argc>4) {
+        printf("wrong arguments \n");
+        printf("usage: \n");
+        printf("%s FILE FRAME_SIZE [LEVEL] \n", exeName);
+        return 1;
+    }
+
+    {   const char* const inFileName = argv[1];
+        unsigned const frameSize = (unsigned)atoi(argv[2]);
+        int const cLevel = (argc==4) ? atoi(argv[3]) : CLEVEL_DEFAULT;
+
+        char* const outFileName = createOutFilename_orDie(inFileName);
+        compressFile_orDie(inFileName, outFileName, cLevel, frameSize);
+        free(outFileName);
+    }
+
+    return 0;
+}