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6139f1889d
Avoids a case where const char* strings were only hashing the pointer values rather than the string content.
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
#ifndef AXIO_CCRC32_H
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#define AXIO_CCRC32_H
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#include <cstddef>
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#include <cstdint>
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#include <string_view>
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#include <type_traits>
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/**
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* CRC32 hash implementation
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*/
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class CCRC32
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{
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/** Current hash value */
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uint32_t mHash = 0xFFFFFFFF;
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public:
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/** Default constructor, initializes the hash to the default value */
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CCRC32();
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/** Allows the hash to be initialized to an arbitrary value */
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explicit CCRC32(uint32_t InitialValue);
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/** Hash arbitrary data */
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void Hash(const void* pkData, size_t Size);
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/** Retrieve the final output hash. (You can keep adding data to the hash after calling this.) */
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uint32_t Digest() const { return mHash; }
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/** Convenience hash methods */
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void Hash(const char* str) { Hash(std::string_view(str)); }
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void Hash(std::string_view str) { Hash(str.data(), str.size()); }
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template <typename T>
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requires(std::is_trivially_copyable_v<T> && !std::is_pointer_v<T>)
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void Hash(const T& value) { Hash(&value, sizeof(value)); }
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static uint32_t StaticHashString(std::string_view str);
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static uint32_t StaticHashData(const void* pkData, size_t Size);
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};
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#endif // AXIO_CCRC32_H
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