函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\lz4\lz4hc_compress.c Create Date:2022-07-27 07:58:24
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：LZ4HC_InsertAndGetWiderMatch

函数原型：static inline __attribute__((__always_inline__)) int LZ4HC_InsertAndGetWiderMatch(LZ4HC_CCtx_internal *hc4, const BYTE *const ip, const BYTE *const iLowLimit, const BYTE *const iHighLimit, int longest, const BYTE **matchpos, const BYTE **startpos, const int maxNbAttempts)

返回类型：int

参数：

类型参数名称
LZ4HC_CCtx_internal *hc4
const BYTE *constip
const BYTE *constiLowLimit
const BYTE *constiHighLimit
intlongest
const BYTE **matchpos
const BYTE **startpos
const intmaxNbAttempts
178  chainTable等于chainTable
179  HashTable等于hashTable
180  base等于All index relative to this position
181  dictLimit等于low that point, need extDict
182  lowPrefixPtr等于base加dictLimit
183  lowLimit等于如果low that point, no more dict 加64乘KB大于ip减base则low that point, no more dict 否则ip减base减64乘KB减1
186  dictBase等于alternate base for extDict
188  nbAttempts等于maxNbAttempts
189  delta等于ip减iLowLimit
192  Update chains up to ip (excluded)
193  matchIndex等于HashTable[LZ4HC_hashPtr(ip)]
195  当matchIndex大于等于lowLimit且nbAttempts循环
197  nbAttempts自减
198  如果matchIndex大于等于dictLimit则
199  matchPtr等于base加matchIndex
201  如果*iLowLimit加longest的和恒等于*matchPtr减delta加longest的和则
224  否则
225  matchPtr等于dictBase加matchIndex
227  如果LZ4_read32(matchPtr)恒等于LZ4_read32(ip)则
229  back等于0
230  vLimit等于ip加dictLimit减matchIndex
232  如果vLimit大于iHighLimit则vLimit等于iHighLimit
235  mlt等于LZ4_count(ip + -************************************* Constants, matchPtr + -************************************* Constants, vLimit)加-************************************* Constants
238  如果ip加mlt恒等于vLimit且vLimit小于iHighLimit则mlt加等于LZ4_count(ip + mlt, base + dictLimit, iHighLimit)
241  当ip加back大于iLowLimit且matchIndex加back大于lowLimit且ip[back - 1]恒等于matchPtr[back - 1]循环
244  back自减
246  mlt减等于back
248  如果mlt大于longest则
249  longest等于mlt
250  matchpos等于base加matchIndex加back
251  startpos等于ip加back
256  matchIndex减等于aster (matchIndex)
259  返回:longest
调用者
名称描述
LZ4HC_compress_generic