xxHash test program by Stefano Marchini @smarchini

xxHash-issue-816.c

/* xxHash test program by Stefano Marchini @smarchini */
/* https://github.com/Cyan4973/xxHash/issues/816#issue-1613505078 */

#define XXH_STATIC_LINKING_ONLY
#define XXH_IMPLEMENTATION
#include "xxhash.h"

#include <stdio.h>
#include <stdlib.h>

int main() {
    enum { MAX = 4096 };
    size_t errorCount = 0;

    char *string = malloc(MAX);
    for (size_t i = 0; i < MAX; i++) string[i] = (char) (rand() & 0xff);

    for (size_t len = 0; len < MAX; len++) {
        XXH64_hash_t direct_hash = XXH3_64bits(string, len);

        XXH3_state_t *state = XXH3_createState();
        XXH3_64bits_reset(state);
        XXH3_64bits_update(state, string, len);
        XXH64_hash_t streaming_hash = XXH3_64bits_digest(state);

        if (direct_hash != streaming_hash) {
            printf("len=%zu", len);

            printf(", direct=0x");
            {
                XXH64_canonical_t direct;
                XXH64_canonicalFromHash(&direct, direct_hash);
                for (size_t i = 0; i < sizeof(direct.digest); ++i) {
                    printf("%02x", direct.digest[i]);
                }
            }

            printf(", streaming=0x");
            {
                XXH64_canonical_t streaming;
                XXH64_canonicalFromHash(&streaming, streaming_hash);
                for (size_t i = 0; i < sizeof(streaming.digest); ++i) {
                    printf("%02x", streaming.digest[i]);
                }
            }

            printf("\n");
            errorCount += 1;
        }
    }

    free(string);

    exit(errorCount == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
    return 0;
}