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170 lines
7.6 KiB
C
170 lines
7.6 KiB
C
/* quicklist.h - A generic doubly linked quicklist implementation
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*
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* Copyright (c) 2014, Matt Stancliff <matt@genges.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this quicklist of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this quicklist of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __QUICKLIST_H__
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#define __QUICKLIST_H__
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/* Node, quicklist, and Iterator are the only data structures used currently. */
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/* quicklistNode is a 32 byte struct describing a ziplist for a quicklist.
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* We use bit fields keep the quicklistNode at 32 bytes.
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* count: 16 bits, max 65536 (max zl bytes is 65k, so max count actually < 32k).
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* encoding: 2 bits, RAW=1, LZF=2.
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* container: 2 bits, NONE=1, ZIPLIST=2.
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* recompress: 1 bit, bool, true if node is temporarry decompressed for usage.
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* attempted_compress: 1 bit, boolean, used for verifying during testing.
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* extra: 12 bits, free for future use; pads out the remainder of 32 bits */
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typedef struct quicklistNode {
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struct quicklistNode *prev;
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struct quicklistNode *next;
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unsigned char *zl;
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unsigned int sz; /* ziplist size in bytes */
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unsigned int count : 16; /* count of items in ziplist */
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unsigned int encoding : 2; /* RAW==1 or LZF==2 */
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unsigned int container : 2; /* NONE==1 or ZIPLIST==2 */
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unsigned int recompress : 1; /* was this node previous compressed? */
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unsigned int attempted_compress : 1; /* node can't compress; too small */
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unsigned int extra : 10; /* more bits to steal for future usage */
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} quicklistNode;
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/* quicklistLZF is a 4+N byte struct holding 'sz' followed by 'compressed'.
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* 'sz' is byte length of 'compressed' field.
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* 'compressed' is LZF data with total (compressed) length 'sz'
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* NOTE: uncompressed length is stored in quicklistNode->sz.
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* When quicklistNode->zl is compressed, node->zl points to a quicklistLZF */
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typedef struct quicklistLZF {
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unsigned int sz; /* LZF size in bytes*/
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char compressed[];
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} quicklistLZF;
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/* quicklist is a 32 byte struct (on 64-bit systems) describing a quicklist.
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* 'count' is the number of total entries.
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* 'len' is the number of quicklist nodes.
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* 'compress' is: -1 if compression disabled, otherwise it's the number
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* of quicklistNodes to leave uncompressed at ends of quicklist.
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* 'fill' is the user-requested (or default) fill factor. */
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typedef struct quicklist {
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quicklistNode *head;
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quicklistNode *tail;
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unsigned long count; /* total count of all entries in all ziplists */
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unsigned int len; /* number of quicklistNodes */
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int fill : 16; /* fill factor for individual nodes */
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unsigned int compress : 16; /* depth of end nodes not to compress;0=off */
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} quicklist;
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typedef struct quicklistIter {
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const quicklist *quicklist;
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quicklistNode *current;
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unsigned char *zi;
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long offset; /* offset in current ziplist */
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int direction;
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} quicklistIter;
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typedef struct quicklistEntry {
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const quicklist *quicklist;
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quicklistNode *node;
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unsigned char *zi;
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unsigned char *value;
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long long longval;
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unsigned int sz;
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int offset;
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} quicklistEntry;
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#define QUICKLIST_HEAD 0
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#define QUICKLIST_TAIL -1
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/* quicklist node encodings */
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#define QUICKLIST_NODE_ENCODING_RAW 1
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#define QUICKLIST_NODE_ENCODING_LZF 2
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/* quicklist compression disable */
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#define QUICKLIST_NOCOMPRESS 0
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/* quicklist container formats */
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#define QUICKLIST_NODE_CONTAINER_NONE 1
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#define QUICKLIST_NODE_CONTAINER_ZIPLIST 2
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#define quicklistNodeIsCompressed(node) \
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((node)->encoding == QUICKLIST_NODE_ENCODING_LZF)
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/* Prototypes */
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quicklist *quicklistCreate(void);
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quicklist *quicklistNew(int fill, int compress);
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void quicklistSetCompressDepth(quicklist *quicklist, int depth);
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void quicklistSetFill(quicklist *quicklist, int fill);
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void quicklistSetOptions(quicklist *quicklist, int fill, int depth);
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void quicklistRelease(quicklist *quicklist);
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int quicklistPushHead(quicklist *quicklist, void *value, const size_t sz);
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int quicklistPushTail(quicklist *quicklist, void *value, const size_t sz);
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void quicklistPush(quicklist *quicklist, void *value, const size_t sz,
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int where);
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void quicklistAppendZiplist(quicklist *quicklist, unsigned char *zl);
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quicklist *quicklistAppendValuesFromZiplist(quicklist *quicklist,
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unsigned char *zl);
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quicklist *quicklistCreateFromZiplist(int fill, int compress,
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unsigned char *zl);
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void quicklistInsertAfter(quicklist *quicklist, quicklistEntry *node,
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void *value, const size_t sz);
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void quicklistInsertBefore(quicklist *quicklist, quicklistEntry *node,
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void *value, const size_t sz);
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void quicklistDelEntry(quicklistIter *iter, quicklistEntry *entry);
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int quicklistReplaceAtIndex(quicklist *quicklist, long index, void *data,
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int sz);
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int quicklistDelRange(quicklist *quicklist, const long start, const long stop);
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quicklistIter *quicklistGetIterator(const quicklist *quicklist, int direction);
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quicklistIter *quicklistGetIteratorAtIdx(const quicklist *quicklist,
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int direction, const long long idx);
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int quicklistNext(quicklistIter *iter, quicklistEntry *node);
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void quicklistReleaseIterator(quicklistIter *iter);
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quicklist *quicklistDup(quicklist *orig);
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int quicklistIndex(const quicklist *quicklist, const long long index,
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quicklistEntry *entry);
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void quicklistRewind(quicklist *quicklist, quicklistIter *li);
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void quicklistRewindTail(quicklist *quicklist, quicklistIter *li);
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void quicklistRotate(quicklist *quicklist);
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int quicklistPopCustom(quicklist *quicklist, int where, unsigned char **data,
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unsigned int *sz, long long *sval,
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void *(*saver)(unsigned char *data, unsigned int sz));
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int quicklistPop(quicklist *quicklist, int where, unsigned char **data,
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unsigned int *sz, long long *slong);
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unsigned int quicklistCount(const quicklist *ql);
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int quicklistCompare(unsigned char *p1, unsigned char *p2, int p2_len);
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size_t quicklistGetLzf(const quicklistNode *node, void **data);
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#ifdef REDIS_TEST
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int quicklistTest(int argc, char *argv[]);
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#endif
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/* Directions for iterators */
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#define AL_START_HEAD 0
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#define AL_START_TAIL 1
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#endif /* __QUICKLIST_H__ */
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