opt: the get&set way of hashmap using xxhash

native/hashmap_get.c

@@ -0,0 +1,15 @@
+#define XXH_STATIC_LINKING_ONLY   /* access advanced declarations */
+#define XXH_IMPLEMENTATION   /* access definitions */
+
+#include "xxhash.h"
+
+// Get hashmap, return the matching ID, and if not found, return -1.
+int64_t field_hashmap_get(FieldHashMap *fmap, const GoString* key){
+    XXH64_hash_t seed   =    123456789;
+    size_t len          =    fmap->N;
+    uint64_t hash       =    XXH64(key->name, len, seed);
+
+    if(fmap.bucket[hash] != NULL){
+        return fmap.bucket[hash]->id;
+    }
+}

native/hashmap_set.c

@@ -0,0 +1,16 @@
+#define XXH_STATIC_LINKING_ONLY   /* access advanced declarations */
+#define XXH_IMPLEMENTATION   /* access definitions */
+
+#include "xxhash.h"
+
+void field_hashmap_set(FieldHashMap *fmap, const GoString* key, int64_t id){
+    XXH64_hash_t seed   =    123456789;
+    size_t len          =    fmap->N;
+    uint64_t hash       =    XXH64(key->name, len, seed);
+    FieldEntry bucket;
+    bucket.name         =    key;
+    bucket.hash         =    hash;
+    bucket.id           =    id;
+    fmap.bucket[hash]   =    bucket;
+    return;
+}

native/native.h

@@ -116,6 +116,22 @@ typedef struct {
     int64_t vt[MAX_RECURSE];
 } StateMachine;
 
+typedef struct {
+    const char * buf;
+    size_t       len;
+} GoString;
+
+typedef struct {
+    GoString name;
+    uint64_t hash;
+    int64_t  id;
+} FieldEntry;
+
+typedef struct {
+    size_t N;
+    FieldEntry* bucket;
+} FieldHashMap;
+
 int f64toa(char *out, double val);
 int i64toa(char *out, int64_t val);
 int u64toa(char *out, uint64_t val);
@@ -151,4 +167,8 @@ long validate_utf8_fast(const GoString *src);
 
 long skip_one_fast(const GoString *src, long *p);
 long get_by_path(const GoString *src, long *p, const GoSlice *path, StateMachine* sm);
+
+void field_hashmap_set(FieldHashMap *fmap, const GoString* key, int64_t id);
+int64_t field_hashmap_get(FieldHashMap *fmap, const GoString* key);
+
 #endif