XXHash.h

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#pragma once

#include <aws/crt/Exports.h>
#include <aws/crt/Types.h>

struct aws_xxhash;
namespace Aws
{
    namespace Crt
    {
        namespace Checksum
        {
            bool AWS_CRT_CPP_API ComputeXXHash64(const ByteCursor &input, ByteBuf &output, uint64_t seed = 0) noexcept;

            bool AWS_CRT_CPP_API
                ComputeXXHash3_64(const ByteCursor &input, ByteBuf &output, uint64_t seed = 0) noexcept;

            bool AWS_CRT_CPP_API
                ComputeXXHash3_128(const ByteCursor &input, ByteBuf &output, uint64_t seed = 0) noexcept;

            class AWS_CRT_CPP_API XXHash final
            {
              public:
                XXHash(const XXHash &) = delete;
                XXHash &operator=(const XXHash &) = delete;
                XXHash(XXHash &&toMove) noexcept = default;
                XXHash &operator=(XXHash &&toMove) noexcept = default;

                inline int LastError() const noexcept { return m_lastError; }

                static XXHash CreateXXHash64(uint64_t seed = 0, Allocator *allocator = ApiAllocator()) noexcept;

                static XXHash CreateXXHash3_64(uint64_t seed = 0, Allocator *allocator = ApiAllocator()) noexcept;

                static XXHash CreateXXHash3_128(uint64_t seed = 0, Allocator *allocator = ApiAllocator()) noexcept;

                bool Update(const ByteCursor &toHash) noexcept;

                bool Digest(ByteBuf &output) noexcept;

              private:
                XXHash(aws_xxhash *hash) noexcept;
                XXHash() = delete;

                ScopedResource<struct aws_xxhash> m_hash;
                int m_lastError;
            };
        } // namespace Checksum
    } // namespace Crt
} // namespace Aws