唯快不破：redis源码剖析05-ziplist字符串压缩链表

ziplist.h

/* * Copyright (c) 2009-2012, Pieter Noordhuis <pcnoordhuis at gmail dot com> * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * *   * Redistributions of source code must retain the above copyright notice, *     this list of conditions and the following disclaimer. *   * Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. *   * Neither the name of Redis nor the names of its contributors may be used *     to endorse or promote products derived from this software without *     specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */#ifndef _ZIPLIST_H#define _ZIPLIST_H#define ZIPLIST_HEAD 0#define ZIPLIST_TAIL 1/*创建新的字符串压缩链表*/unsigned char *ziplistNew(void);/*合并两条压缩链表为一条压缩链表*/unsigned char *ziplistMerge(unsigned char **first, unsigned char **second);/*向压缩链表指定位置插入指定长度的字符串*/unsigned char *ziplistPush(unsigned char *zl, unsigned char *s, unsigned int slen, int where);/*通过下标获取压缩链表中指定节点*/unsigned char *ziplistIndex(unsigned char *zl, int index);/*获取压缩链表中指定节点的下一个节点*/unsigned char *ziplistNext(unsigned char *zl, unsigned char *p);/*获取压缩链表中指定节点的前一个节点*/unsigned char *ziplistPrev(unsigned char *zl, unsigned char *p);/*在压缩链表中查找*/unsigned int ziplistGet(unsigned char *p, unsigned char **sval, unsigned int *slen, long long *lval);/*在压缩链表中指定位置插入字符串*/unsigned char *ziplistInsert(unsigned char *zl, unsigned char *p, unsigned char *s, unsigned int slen);/*删除压缩链表中指定字符串*/unsigned char *ziplistDelete(unsigned char *zl, unsigned char **p);/*删除压缩链表中指定范围的节点*/unsigned char *ziplistDeleteRange(unsigned char *zl, int index, unsigned int num);/*压缩链表相比较*/unsigned int ziplistCompare(unsigned char *p, unsigned char *s, unsigned int slen);/*压缩链表中查找*/unsigned char *ziplistFind(unsigned char *p, unsigned char *vstr, unsigned int vlen, unsigned int skip);/*字符串压缩链表长度*/unsigned int ziplistLen(unsigned char *zl);/*字符串压缩链表长度*/size_t ziplistBlobLen(unsigned char *zl);/**/void ziplistRepr(unsigned char *zl);#ifdef REDIS_TESTint ziplistTest(int argc, char *argv[]);#endif#endif /* _ZIPLIST_H */