balance sheet stuff, added khash hashmaps

include/balance_sheet.h

@@ -2,10 +2,46 @@
 #define BALANCE_SHEET_H
 
 #include <stdint.h>
+#include <dynarr.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <khash/khash.h>
+#include <crypto/crypto.h>
+#include <string.h>
+
+typedef struct {
+    uint8_t bytes[32];
+} key32_t;
 
 typedef struct {
     uint8_t address[32]; // For now just the SHA-256 of the public key; allows representation in different encodings (base58, bech32, etc) without changing the underlying data structure
     uint64_t balance;
+    // TODO: Additional things
 } balance_sheet_entry_t;
 
-#endif
+static inline uint32_t hash_key32(key32_t k) {
+    uint32_t hash = 2166136261u;
+    for (int i = 0; i < 32; i++) {
+        hash ^= k.bytes[i];
+        hash *= 16777619;
+    }
+    return hash;
+}
+
+static inline int eq_key32(key32_t a, key32_t b) {
+    return memcmp(a.bytes, b.bytes, 32) == 0;
+}
+
+KHASH_INIT(balance_sheet_map_m, key32_t, balance_sheet_entry_t, 1, hash_key32, eq_key32);
+extern khash_t(balance_sheet_map_m)* sheetMap;
+
+void BalanceSheet_Init();
+int BalanceSheet_Insert(balance_sheet_entry_t entry);
+bool BalanceSheet_Lookup(uint8_t* address, balance_sheet_entry_t* out);
+bool BalanceSheet_SaveToFile(const char* outPath);
+bool BalanceSheet_LoadFromFile(const char* inPath); 
+void BalanceSheet_Print();
+void BalanceSheet_Destroy();
+
+#endif