/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>

#include <syslog.h>

#include "compressor.h"

#include "fuzz.h"

#include "log.h"

#include "util.h"

typedef struct header {

        uint32_t alg;

        uint32_t reserved[5]; /* Extra space to keep fuzz cases stable in case we need to

                               * add stuff in the future. */

        uint8_t data[];

} header;

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

        _cleanup_free_ void *buf = NULL;

        int r;

        if (size < offsetof(header, data) + 1)

                return 0;

        /* We don't want to fill the logs with messages about parse errors.

         * Disable most logging if not running standalone */

        if (!getenv("CASYNC_LOG_LEVEL"))

                set_log_level(LOG_CRIT);

        const header *h = (struct header*) data;

        const size_t data_len = size - offsetof(header, data);

        _cleanup_(compressor_finish) CompressorContext c = COMPRESSOR_CONTEXT_INIT;

        r = compressor_start_decode(&c, h->alg);

        if (r < 0) {

                log_debug_errno(r, "compressor_start_decode failed: %m");

                return 0;

        }

        log_info("Using compression %d, data size=%zu", h->alg, data_len);

        size_t out_size = MAX(size, 128u), /* Make the buffer a bit larger for very small data */

                ret_done;

        buf = malloc(out_size);

        if (!buf) {

                log_oom();

                return 0;

        }

        r = compressor_input(&c, h->data, data_len);

        if (r < 0) {

                log_debug_errno(r, "compressor_input failed: %m");

                return 0;

        }

        r = compressor_decode(&c, buf, out_size, &ret_done);

        if (r < 0) {

                log_debug_errno(r, "compressor_decode failed: %m");

                return 0;

        }

        return 0;

}