/**

 * This fuzz target performs a lz4 round-trip test (compress & decompress),

 * compares the result with the original, and calls abort() on corruption.

 */

#include <stddef.h>

#include <stdint.h>

#include <stdlib.h>

#include <string.h>

#include "fuzz_helpers.h"

#include "fuzz_data_producer.h"

#include "lz4.h"

#include "lz4hc.h"

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);

    int const level = FUZZ_dataProducer_range32(producer,

        LZ4HC_CLEVEL_MIN, LZ4HC_CLEVEL_MAX);

    size = FUZZ_dataProducer_remainingBytes(producer);

    size_t const dstCapacity = LZ4_compressBound(size);

    char* const dst = (char*)malloc(dstCapacity);

    char* const rt = (char*)malloc(size);

    FUZZ_ASSERT(dst);

    FUZZ_ASSERT(rt);

    /* Compression must succeed and round trip correctly. */

    int const dstSize = LZ4_compress_HC((const char*)data, dst, size,

                                        dstCapacity, level);

    FUZZ_ASSERT(dstSize > 0);

    int const rtSize = LZ4_decompress_safe(dst, rt, dstSize, size);

    FUZZ_ASSERT_MSG(rtSize == size, "Incorrect size");

    FUZZ_ASSERT_MSG(!memcmp(data, rt, size), "Corruption!");

    free(dst);

    free(rt);

    FUZZ_dataProducer_free(producer);

    return 0;

}