lz4

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/**
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 * This fuzz target attempts to compress the fuzzed data with the simple
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 * compression function with an output buffer that may be too small to
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 * ensure that the compressor never crashes.
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 */
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "fuzz_helpers.h"
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#include "fuzz_data_producer.h"
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#include "lz4.h"
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#include "lz4hc.h"
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(data, size);
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    size_t const dstCapacitySeed = FUZZ_dataProducer_retrieve32(producer);
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    size_t const levelSeed = FUZZ_dataProducer_retrieve32(producer);
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    size = FUZZ_dataProducer_remainingBytes(producer);
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    size_t const dstCapacity = FUZZ_getRange_from_uint32(dstCapacitySeed, 0, size);
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    int const level = FUZZ_getRange_from_uint32(levelSeed, LZ4HC_CLEVEL_MIN, LZ4HC_CLEVEL_MAX);
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    char* const dst = (char*)malloc(dstCapacity);
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    char* const rt = (char*)malloc(size);
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    FUZZ_ASSERT(dst);
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    FUZZ_ASSERT(rt);
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    /* If compression succeeds it must round trip correctly. */
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    {
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        int const dstSize = LZ4_compress_HC((const char*)data, dst, size,
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                                            dstCapacity, level);
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        if (dstSize > 0) {
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            int const rtSize = LZ4_decompress_safe(dst, rt, dstSize, size);
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            FUZZ_ASSERT_MSG(rtSize == size, "Incorrect regenerated size");
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            FUZZ_ASSERT_MSG(!memcmp(data, rt, size), "Corruption!");
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        }
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    }
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    if (dstCapacity > 0) {
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        /* Compression succeeds and must round trip correctly. */
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        void* state = malloc(LZ4_sizeofStateHC());
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        FUZZ_ASSERT(state);
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        int compressedSize = size;
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        int const dstSize = LZ4_compress_HC_destSize(state, (const char*)data,
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                                                     dst, &compressedSize,
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                                                     dstCapacity, level);
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        FUZZ_ASSERT(dstSize > 0);
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        int const rtSize = LZ4_decompress_safe(dst, rt, dstSize, size);
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        FUZZ_ASSERT_MSG(rtSize == compressedSize, "Incorrect regenerated size");
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        FUZZ_ASSERT_MSG(!memcmp(data, rt, compressedSize), "Corruption!");
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        free(state);
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    }
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    free(dst);
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    free(rt);
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    FUZZ_dataProducer_free(producer);
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    return 0;
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}
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