Merge "Test: Add a fuzzer for libmedia's metadata component"

cc_fuzz {

  name: "libmedia_metadata_fuzzer",

  srcs: [

    "libmedia_metadata_fuzzer.cpp",

  ],

  shared_libs: [

    "libmedia",

    "libbinder",

  ],

}

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//This program fuzzes Metadata.cpp

#include <stddef.h>

#include <stdint.h>

#include <fuzzer/FuzzedDataProvider.h>

#include <media/Metadata.h>

#include <binder/Parcel.h>

using namespace android;

using namespace media;

static const float want_prob = 0.5;

bool bytesRemain(FuzzedDataProvider *fdp);

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

    FuzzedDataProvider fdp(data, size);

    Parcel p;

    Metadata md = Metadata(&p);

    md.appendHeader();

    while (bytesRemain(&fdp)) {

        float got_prob = fdp.ConsumeProbability<float>();

        if (!bytesRemain(&fdp)) {

            break;

        }

        if (got_prob < want_prob) {

            int32_t key_bool = fdp.ConsumeIntegral<int32_t>();

            if (!bytesRemain(&fdp)) {

                break;

            }

            bool val_bool = fdp.ConsumeBool();

            md.appendBool(key_bool, val_bool);

        } else {

            int32_t key_int32 = fdp.ConsumeIntegral<int32_t>();

            if (!bytesRemain(&fdp)) {

                break;

            }

            bool val_int32 = fdp.ConsumeIntegral<int32_t>();

            md.appendInt32(key_int32, val_int32);

        }

        md.updateLength();

    }

    md.resetParcel();

    return 0;

}

bool bytesRemain(FuzzedDataProvider *fdp){

    return fdp -> remaining_bytes() > 0;

}

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