94 lines
2.8 KiB
MQL5
94 lines
2.8 KiB
MQL5
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//+------------------------------------------------------------------+
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//| FNV1a64.mqh |
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//| Copyright 2026, Niquel Mendoza. |
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//| https://www.mql5.com/ |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2026, Niquel Mendoza."
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#property link "https://www.mql5.com/"
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#property strict
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#ifndef SIMPHASH_SRC_HASH_STR_FNV1A64_MQH
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#define SIMPHASH_SRC_HASH_STR_FNV1A64_MQH
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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#include "..\\Def.mqh"
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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namespace TSN
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{
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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class CHashFnv1A64 : public IHashGenerator
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{
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private:
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ulong m_basis;
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ulong m_prime_offset;
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public:
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CHashFnv1A64(void) {}
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~CHashFnv1A64(void) {}
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//---
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bool Init(CYmlNode& node) override final
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{
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//---
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CYmlNode basis = node["basis"];
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if((basis.GetFlag()&TSN_YAML_VTYPE_ALL_STRING) != 0) // def
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{
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m_basis = FNV_OFFSET_BASIS;
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}
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else
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{
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m_basis = ulong(basis.ToInt(FNV_OFFSET_BASIS));
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}
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//---
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CYmlNode prime = node["prime"];
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if((prime.GetFlag()&TSN_YAML_VTYPE_ALL_STRING) != 0)
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{
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m_prime_offset = FNV_PRIME;
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}
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else
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{
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m_prime_offset = ulong(prime.ToInt(FNV_PRIME));
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}
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//---
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return true;
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}
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//---
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ulong Hash(const string& key) override final
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{
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const int len = StringLen(key);
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ulong hash = m_basis;
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FNV1a_64_AsM_Str(key, len, hash, m_prime_offset)
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return hash;
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}
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//---
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void AddIncludes(string& data) override final
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{
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data += "#include <TSN/Tables/AllHashes.mqh>\r\n";
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}
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//---
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void BuildString(string& data) override final
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{
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data += "//---\r\n";
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data += " const int len = StringLen(key);\r\n";
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data += " ulong key_hash = " + string(m_basis) + "ULL;\r\n";
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data += " FNV1a_64_AsM_Str(key, len, key_hash, " + string(m_prime_offset) + "ULL)\r\n";
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data += "\r\n";
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}
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};
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}
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//+------------------------------------------------------------------+
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#endif // SIMPHASH_SRC_HASH_STR_FNV1A64_MQH
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