Index: third_party/sqlite/sqlite-src-3080704/src/hash.h |
diff --git a/third_party/sqlite/sqlite-src-3080704/src/hash.h b/third_party/sqlite/sqlite-src-3080704/src/hash.h |
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+/* |
+** 2001 September 22 |
+** |
+** The author disclaims copyright to this source code. In place of |
+** a legal notice, here is a blessing: |
+** |
+** May you do good and not evil. |
+** May you find forgiveness for yourself and forgive others. |
+** May you share freely, never taking more than you give. |
+** |
+************************************************************************* |
+** This is the header file for the generic hash-table implementation |
+** used in SQLite. |
+*/ |
+#ifndef _SQLITE_HASH_H_ |
+#define _SQLITE_HASH_H_ |
+ |
+/* Forward declarations of structures. */ |
+typedef struct Hash Hash; |
+typedef struct HashElem HashElem; |
+ |
+/* A complete hash table is an instance of the following structure. |
+** The internals of this structure are intended to be opaque -- client |
+** code should not attempt to access or modify the fields of this structure |
+** directly. Change this structure only by using the routines below. |
+** However, some of the "procedures" and "functions" for modifying and |
+** accessing this structure are really macros, so we can't really make |
+** this structure opaque. |
+** |
+** All elements of the hash table are on a single doubly-linked list. |
+** Hash.first points to the head of this list. |
+** |
+** There are Hash.htsize buckets. Each bucket points to a spot in |
+** the global doubly-linked list. The contents of the bucket are the |
+** element pointed to plus the next _ht.count-1 elements in the list. |
+** |
+** Hash.htsize and Hash.ht may be zero. In that case lookup is done |
+** by a linear search of the global list. For small tables, the |
+** Hash.ht table is never allocated because if there are few elements |
+** in the table, it is faster to do a linear search than to manage |
+** the hash table. |
+*/ |
+struct Hash { |
+ unsigned int htsize; /* Number of buckets in the hash table */ |
+ unsigned int count; /* Number of entries in this table */ |
+ HashElem *first; /* The first element of the array */ |
+ struct _ht { /* the hash table */ |
+ int count; /* Number of entries with this hash */ |
+ HashElem *chain; /* Pointer to first entry with this hash */ |
+ } *ht; |
+}; |
+ |
+/* Each element in the hash table is an instance of the following |
+** structure. All elements are stored on a single doubly-linked list. |
+** |
+** Again, this structure is intended to be opaque, but it can't really |
+** be opaque because it is used by macros. |
+*/ |
+struct HashElem { |
+ HashElem *next, *prev; /* Next and previous elements in the table */ |
+ void *data; /* Data associated with this element */ |
+ const char *pKey; /* Key associated with this element */ |
+}; |
+ |
+/* |
+** Access routines. To delete, insert a NULL pointer. |
+*/ |
+void sqlite3HashInit(Hash*); |
+void *sqlite3HashInsert(Hash*, const char *pKey, void *pData); |
+void *sqlite3HashFind(const Hash*, const char *pKey); |
+void sqlite3HashClear(Hash*); |
+ |
+/* |
+** Macros for looping over all elements of a hash table. The idiom is |
+** like this: |
+** |
+** Hash h; |
+** HashElem *p; |
+** ... |
+** for(p=sqliteHashFirst(&h); p; p=sqliteHashNext(p)){ |
+** SomeStructure *pData = sqliteHashData(p); |
+** // do something with pData |
+** } |
+*/ |
+#define sqliteHashFirst(H) ((H)->first) |
+#define sqliteHashNext(E) ((E)->next) |
+#define sqliteHashData(E) ((E)->data) |
+/* #define sqliteHashKey(E) ((E)->pKey) // NOT USED */ |
+/* #define sqliteHashKeysize(E) ((E)->nKey) // NOT USED */ |
+ |
+/* |
+** Number of entries in a hash table |
+*/ |
+/* #define sqliteHashCount(H) ((H)->count) // NOT USED */ |
+ |
+#endif /* _SQLITE_HASH_H_ */ |