Staging
v0.6.0
v0.6.0
https://github.com/torvalds/linux
Revision 171c1fd98df3d5948d9a9eb755274850fa5e59c6 authored by Haiyang Zhang on 21 November 2019, 21:33:41 UTC, committed by David S. Miller on 22 November 2019, 03:32:23 UTC
If negotiated NVSP version <= NVSP_PROTOCOL_VERSION_6, the offset may be wrong (too small) due to a host bug. This can cause missing the end of the send indirection table, and add multiple zero entries from leading zeros before the data region. This bug adds extra burden on channel 0. So fix the offset by computing it from the data structure sizes. This will ensure netvsc driver runs normally on unfixed hosts, and future fixed hosts. Fixes: 5b54dac856cb ("hyperv: Add support for virtual Receive Side Scaling (vRSS)") Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 71f2195
Tip revision: 171c1fd98df3d5948d9a9eb755274850fa5e59c6 authored by Haiyang Zhang on 21 November 2019, 21:33:41 UTC
hv_netvsc: Fix send_table offset in case of a host bug
hv_netvsc: Fix send_table offset in case of a host bug
Tip revision: 171c1fd
lz4_compress.c
/*
* LZ4 - Fast LZ compression algorithm
* Copyright (C) 2011 - 2016, Yann Collet.
* BSD 2 - Clause License (http://www.opensource.org/licenses/bsd - license.php)
* 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.
* 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.
* You can contact the author at :
* - LZ4 homepage : http://www.lz4.org
* - LZ4 source repository : https://github.com/lz4/lz4
*
* Changed for kernel usage by:
* Sven Schmidt <4sschmid@informatik.uni-hamburg.de>
*/
/*-************************************
* Dependencies
**************************************/
#include <linux/lz4.h>
#include "lz4defs.h"
#include <linux/module.h>
#include <linux/kernel.h>
#include <asm/unaligned.h>
static const int LZ4_minLength = (MFLIMIT + 1);
static const int LZ4_64Klimit = ((64 * KB) + (MFLIMIT - 1));
/*-******************************
* Compression functions
********************************/
static FORCE_INLINE U32 LZ4_hash4(
U32 sequence,
tableType_t const tableType)
{
if (tableType == byU16)
return ((sequence * 2654435761U)
>> ((MINMATCH * 8) - (LZ4_HASHLOG + 1)));
else
return ((sequence * 2654435761U)
>> ((MINMATCH * 8) - LZ4_HASHLOG));
}
static FORCE_INLINE U32 LZ4_hash5(
U64 sequence,
tableType_t const tableType)
{
const U32 hashLog = (tableType == byU16)
? LZ4_HASHLOG + 1
: LZ4_HASHLOG;
#if LZ4_LITTLE_ENDIAN
static const U64 prime5bytes = 889523592379ULL;
return (U32)(((sequence << 24) * prime5bytes) >> (64 - hashLog));
#else
static const U64 prime8bytes = 11400714785074694791ULL;
return (U32)(((sequence >> 24) * prime8bytes) >> (64 - hashLog));
#endif
}
static FORCE_INLINE U32 LZ4_hashPosition(
const void *p,
tableType_t const tableType)
{
#if LZ4_ARCH64
if (tableType == byU32)
return LZ4_hash5(LZ4_read_ARCH(p), tableType);
#endif
return LZ4_hash4(LZ4_read32(p), tableType);
}
static void LZ4_putPositionOnHash(
const BYTE *p,
U32 h,
void *tableBase,
tableType_t const tableType,
const BYTE *srcBase)
{
switch (tableType) {
case byPtr:
{
const BYTE **hashTable = (const BYTE **)tableBase;
hashTable[h] = p;
return;
}
case byU32:
{
U32 *hashTable = (U32 *) tableBase;
hashTable[h] = (U32)(p - srcBase);
return;
}
case byU16:
{
U16 *hashTable = (U16 *) tableBase;
hashTable[h] = (U16)(p - srcBase);
return;
}
}
}
static FORCE_INLINE void LZ4_putPosition(
const BYTE *p,
void *tableBase,
tableType_t tableType,
const BYTE *srcBase)
{
U32 const h = LZ4_hashPosition(p, tableType);
LZ4_putPositionOnHash(p, h, tableBase, tableType, srcBase);
}
static const BYTE *LZ4_getPositionOnHash(
U32 h,
void *tableBase,
tableType_t tableType,
const BYTE *srcBase)
{
if (tableType == byPtr) {
const BYTE **hashTable = (const BYTE **) tableBase;
return hashTable[h];
}
if (tableType == byU32) {
const U32 * const hashTable = (U32 *) tableBase;
return hashTable[h] + srcBase;
}
{
/* default, to ensure a return */
const U16 * const hashTable = (U16 *) tableBase;
return hashTable[h] + srcBase;
}
}
static FORCE_INLINE const BYTE *LZ4_getPosition(
const BYTE *p,
void *tableBase,
tableType_t tableType,
const BYTE *srcBase)
{
U32 const h = LZ4_hashPosition(p, tableType);
return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase);
}
/*
* LZ4_compress_generic() :
* inlined, to ensure branches are decided at compilation time
*/
static FORCE_INLINE int LZ4_compress_generic(
LZ4_stream_t_internal * const dictPtr,
const char * const source,
char * const dest,
const int inputSize,
const int maxOutputSize,
const limitedOutput_directive outputLimited,
const tableType_t tableType,
const dict_directive dict,
const dictIssue_directive dictIssue,
const U32 acceleration)
{
const BYTE *ip = (const BYTE *) source;
const BYTE *base;
const BYTE *lowLimit;
const BYTE * const lowRefLimit = ip - dictPtr->dictSize;
const BYTE * const dictionary = dictPtr->dictionary;
const BYTE * const dictEnd = dictionary + dictPtr->dictSize;
const size_t dictDelta = dictEnd - (const BYTE *)source;
const BYTE *anchor = (const BYTE *) source;
const BYTE * const iend = ip + inputSize;
const BYTE * const mflimit = iend - MFLIMIT;
const BYTE * const matchlimit = iend - LASTLITERALS;
BYTE *op = (BYTE *) dest;
BYTE * const olimit = op + maxOutputSize;
U32 forwardH;
size_t refDelta = 0;
/* Init conditions */
if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) {
/* Unsupported inputSize, too large (or negative) */
return 0;
}
switch (dict) {
case noDict:
default:
base = (const BYTE *)source;
lowLimit = (const BYTE *)source;
break;
case withPrefix64k:
base = (const BYTE *)source - dictPtr->currentOffset;
lowLimit = (const BYTE *)source - dictPtr->dictSize;
break;
case usingExtDict:
base = (const BYTE *)source - dictPtr->currentOffset;
lowLimit = (const BYTE *)source;
break;
}
if ((tableType == byU16)
&& (inputSize >= LZ4_64Klimit)) {
/* Size too large (not within 64K limit) */
return 0;
}
if (inputSize < LZ4_minLength) {
/* Input too small, no compression (all literals) */
goto _last_literals;
}
/* First Byte */
LZ4_putPosition(ip, dictPtr->hashTable, tableType, base);
ip++;
forwardH = LZ4_hashPosition(ip, tableType);
/* Main Loop */
for ( ; ; ) {
const BYTE *match;
BYTE *token;
/* Find a match */
{
const BYTE *forwardIp = ip;
unsigned int step = 1;
unsigned int searchMatchNb = acceleration << LZ4_SKIPTRIGGER;
do {
U32 const h = forwardH;
ip = forwardIp;
forwardIp += step;
step = (searchMatchNb++ >> LZ4_SKIPTRIGGER);
if (unlikely(forwardIp > mflimit))
goto _last_literals;
match = LZ4_getPositionOnHash(h,
dictPtr->hashTable,
tableType, base);
if (dict == usingExtDict) {
if (match < (const BYTE *)source) {
refDelta = dictDelta;
lowLimit = dictionary;
} else {
refDelta = 0;
lowLimit = (const BYTE *)source;
} }
forwardH = LZ4_hashPosition(forwardIp,
tableType);
LZ4_putPositionOnHash(ip, h, dictPtr->hashTable,
tableType, base);
} while (((dictIssue == dictSmall)
? (match < lowRefLimit)
: 0)
|| ((tableType == byU16)
? 0
: (match + MAX_DISTANCE < ip))
|| (LZ4_read32(match + refDelta)
!= LZ4_read32(ip)));
}
/* Catch up */
while (((ip > anchor) & (match + refDelta > lowLimit))
&& (unlikely(ip[-1] == match[refDelta - 1]))) {
ip--;
match--;
}
/* Encode Literals */
{
unsigned const int litLength = (unsigned int)(ip - anchor);
token = op++;
if ((outputLimited) &&
/* Check output buffer overflow */
(unlikely(op + litLength +
(2 + 1 + LASTLITERALS) +
(litLength / 255) > olimit)))
return 0;
if (litLength >= RUN_MASK) {
int len = (int)litLength - RUN_MASK;
*token = (RUN_MASK << ML_BITS);
for (; len >= 255; len -= 255)
*op++ = 255;
*op++ = (BYTE)len;
} else
*token = (BYTE)(litLength << ML_BITS);
/* Copy Literals */
LZ4_wildCopy(op, anchor, op + litLength);
op += litLength;
}
_next_match:
/* Encode Offset */
LZ4_writeLE16(op, (U16)(ip - match));
op += 2;
/* Encode MatchLength */
{
unsigned int matchCode;
if ((dict == usingExtDict)
&& (lowLimit == dictionary)) {
const BYTE *limit;
match += refDelta;
limit = ip + (dictEnd - match);
if (limit > matchlimit)
limit = matchlimit;
matchCode = LZ4_count(ip + MINMATCH,
match + MINMATCH, limit);
ip += MINMATCH + matchCode;
if (ip == limit) {
unsigned const int more = LZ4_count(ip,
(const BYTE *)source,
matchlimit);
matchCode += more;
ip += more;
}
} else {
matchCode = LZ4_count(ip + MINMATCH,
match + MINMATCH, matchlimit);
ip += MINMATCH + matchCode;
}
if (outputLimited &&
/* Check output buffer overflow */
(unlikely(op +
(1 + LASTLITERALS) +
(matchCode >> 8) > olimit)))
return 0;
if (matchCode >= ML_MASK) {
*token += ML_MASK;
matchCode -= ML_MASK;
LZ4_write32(op, 0xFFFFFFFF);
while (matchCode >= 4 * 255) {
op += 4;
LZ4_write32(op, 0xFFFFFFFF);
matchCode -= 4 * 255;
}
op += matchCode / 255;
*op++ = (BYTE)(matchCode % 255);
} else
*token += (BYTE)(matchCode);
}
anchor = ip;
/* Test end of chunk */
if (ip > mflimit)
break;
/* Fill table */
LZ4_putPosition(ip - 2, dictPtr->hashTable, tableType, base);
/* Test next position */
match = LZ4_getPosition(ip, dictPtr->hashTable,
tableType, base);
if (dict == usingExtDict) {
if (match < (const BYTE *)source) {
refDelta = dictDelta;
lowLimit = dictionary;
} else {
refDelta = 0;
lowLimit = (const BYTE *)source;
}
}
LZ4_putPosition(ip, dictPtr->hashTable, tableType, base);
if (((dictIssue == dictSmall) ? (match >= lowRefLimit) : 1)
&& (match + MAX_DISTANCE >= ip)
&& (LZ4_read32(match + refDelta) == LZ4_read32(ip))) {
token = op++;
*token = 0;
goto _next_match;
}
/* Prepare next loop */
forwardH = LZ4_hashPosition(++ip, tableType);
}
_last_literals:
/* Encode Last Literals */
{
size_t const lastRun = (size_t)(iend - anchor);
if ((outputLimited) &&
/* Check output buffer overflow */
((op - (BYTE *)dest) + lastRun + 1 +
((lastRun + 255 - RUN_MASK) / 255) > (U32)maxOutputSize))
return 0;
if (lastRun >= RUN_MASK) {
size_t accumulator = lastRun - RUN_MASK;
*op++ = RUN_MASK << ML_BITS;
for (; accumulator >= 255; accumulator -= 255)
*op++ = 255;
*op++ = (BYTE) accumulator;
} else {
*op++ = (BYTE)(lastRun << ML_BITS);
}
memcpy(op, anchor, lastRun);
op += lastRun;
}
/* End */
return (int) (((char *)op) - dest);
}
static int LZ4_compress_fast_extState(
void *state,
const char *source,
char *dest,
int inputSize,
int maxOutputSize,
int acceleration)
{
LZ4_stream_t_internal *ctx = &((LZ4_stream_t *)state)->internal_donotuse;
#if LZ4_ARCH64
const tableType_t tableType = byU32;
#else
const tableType_t tableType = byPtr;
#endif
LZ4_resetStream((LZ4_stream_t *)state);
if (acceleration < 1)
acceleration = LZ4_ACCELERATION_DEFAULT;
if (maxOutputSize >= LZ4_COMPRESSBOUND(inputSize)) {
if (inputSize < LZ4_64Klimit)
return LZ4_compress_generic(ctx, source,
dest, inputSize, 0,
noLimit, byU16, noDict,
noDictIssue, acceleration);
else
return LZ4_compress_generic(ctx, source,
dest, inputSize, 0,
noLimit, tableType, noDict,
noDictIssue, acceleration);
} else {
if (inputSize < LZ4_64Klimit)
return LZ4_compress_generic(ctx, source,
dest, inputSize,
maxOutputSize, limitedOutput, byU16, noDict,
noDictIssue, acceleration);
else
return LZ4_compress_generic(ctx, source,
dest, inputSize,
maxOutputSize, limitedOutput, tableType, noDict,
noDictIssue, acceleration);
}
}
int LZ4_compress_fast(const char *source, char *dest, int inputSize,
int maxOutputSize, int acceleration, void *wrkmem)
{
return LZ4_compress_fast_extState(wrkmem, source, dest, inputSize,
maxOutputSize, acceleration);
}
EXPORT_SYMBOL(LZ4_compress_fast);
int LZ4_compress_default(const char *source, char *dest, int inputSize,
int maxOutputSize, void *wrkmem)
{
return LZ4_compress_fast(source, dest, inputSize,
maxOutputSize, LZ4_ACCELERATION_DEFAULT, wrkmem);
}
EXPORT_SYMBOL(LZ4_compress_default);
/*-******************************
* *_destSize() variant
********************************/
static int LZ4_compress_destSize_generic(
LZ4_stream_t_internal * const ctx,
const char * const src,
char * const dst,
int * const srcSizePtr,
const int targetDstSize,
const tableType_t tableType)
{
const BYTE *ip = (const BYTE *) src;
const BYTE *base = (const BYTE *) src;
const BYTE *lowLimit = (const BYTE *) src;
const BYTE *anchor = ip;
const BYTE * const iend = ip + *srcSizePtr;
const BYTE * const mflimit = iend - MFLIMIT;
const BYTE * const matchlimit = iend - LASTLITERALS;
BYTE *op = (BYTE *) dst;
BYTE * const oend = op + targetDstSize;
BYTE * const oMaxLit = op + targetDstSize - 2 /* offset */
- 8 /* because 8 + MINMATCH == MFLIMIT */ - 1 /* token */;
BYTE * const oMaxMatch = op + targetDstSize
- (LASTLITERALS + 1 /* token */);
BYTE * const oMaxSeq = oMaxLit - 1 /* token */;
U32 forwardH;
/* Init conditions */
/* Impossible to store anything */
if (targetDstSize < 1)
return 0;
/* Unsupported input size, too large (or negative) */
if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE)
return 0;
/* Size too large (not within 64K limit) */
if ((tableType == byU16) && (*srcSizePtr >= LZ4_64Klimit))
return 0;
/* Input too small, no compression (all literals) */
if (*srcSizePtr < LZ4_minLength)
goto _last_literals;
/* First Byte */
*srcSizePtr = 0;
LZ4_putPosition(ip, ctx->hashTable, tableType, base);
ip++; forwardH = LZ4_hashPosition(ip, tableType);
/* Main Loop */
for ( ; ; ) {
const BYTE *match;
BYTE *token;
/* Find a match */
{
const BYTE *forwardIp = ip;
unsigned int step = 1;
unsigned int searchMatchNb = 1 << LZ4_SKIPTRIGGER;
do {
U32 h = forwardH;
ip = forwardIp;
forwardIp += step;
step = (searchMatchNb++ >> LZ4_SKIPTRIGGER);
if (unlikely(forwardIp > mflimit))
goto _last_literals;
match = LZ4_getPositionOnHash(h, ctx->hashTable,
tableType, base);
forwardH = LZ4_hashPosition(forwardIp,
tableType);
LZ4_putPositionOnHash(ip, h,
ctx->hashTable, tableType,
base);
} while (((tableType == byU16)
? 0
: (match + MAX_DISTANCE < ip))
|| (LZ4_read32(match) != LZ4_read32(ip)));
}
/* Catch up */
while ((ip > anchor)
&& (match > lowLimit)
&& (unlikely(ip[-1] == match[-1]))) {
ip--;
match--;
}
/* Encode Literal length */
{
unsigned int litLength = (unsigned int)(ip - anchor);
token = op++;
if (op + ((litLength + 240) / 255)
+ litLength > oMaxLit) {
/* Not enough space for a last match */
op--;
goto _last_literals;
}
if (litLength >= RUN_MASK) {
unsigned int len = litLength - RUN_MASK;
*token = (RUN_MASK<<ML_BITS);
for (; len >= 255; len -= 255)
*op++ = 255;
*op++ = (BYTE)len;
} else
*token = (BYTE)(litLength << ML_BITS);
/* Copy Literals */
LZ4_wildCopy(op, anchor, op + litLength);
op += litLength;
}
_next_match:
/* Encode Offset */
LZ4_writeLE16(op, (U16)(ip - match)); op += 2;
/* Encode MatchLength */
{
size_t matchLength = LZ4_count(ip + MINMATCH,
match + MINMATCH, matchlimit);
if (op + ((matchLength + 240)/255) > oMaxMatch) {
/* Match description too long : reduce it */
matchLength = (15 - 1) + (oMaxMatch - op) * 255;
}
ip += MINMATCH + matchLength;
if (matchLength >= ML_MASK) {
*token += ML_MASK;
matchLength -= ML_MASK;
while (matchLength >= 255) {
matchLength -= 255;
*op++ = 255;
}
*op++ = (BYTE)matchLength;
} else
*token += (BYTE)(matchLength);
}
anchor = ip;
/* Test end of block */
if (ip > mflimit)
break;
if (op > oMaxSeq)
break;
/* Fill table */
LZ4_putPosition(ip - 2, ctx->hashTable, tableType, base);
/* Test next position */
match = LZ4_getPosition(ip, ctx->hashTable, tableType, base);
LZ4_putPosition(ip, ctx->hashTable, tableType, base);
if ((match + MAX_DISTANCE >= ip)
&& (LZ4_read32(match) == LZ4_read32(ip))) {
token = op++; *token = 0;
goto _next_match;
}
/* Prepare next loop */
forwardH = LZ4_hashPosition(++ip, tableType);
}
_last_literals:
/* Encode Last Literals */
{
size_t lastRunSize = (size_t)(iend - anchor);
if (op + 1 /* token */
+ ((lastRunSize + 240) / 255) /* litLength */
+ lastRunSize /* literals */ > oend) {
/* adapt lastRunSize to fill 'dst' */
lastRunSize = (oend - op) - 1;
lastRunSize -= (lastRunSize + 240) / 255;
}
ip = anchor + lastRunSize;
if (lastRunSize >= RUN_MASK) {
size_t accumulator = lastRunSize - RUN_MASK;
*op++ = RUN_MASK << ML_BITS;
for (; accumulator >= 255; accumulator -= 255)
*op++ = 255;
*op++ = (BYTE) accumulator;
} else {
*op++ = (BYTE)(lastRunSize<<ML_BITS);
}
memcpy(op, anchor, lastRunSize);
op += lastRunSize;
}
/* End */
*srcSizePtr = (int) (((const char *)ip) - src);
return (int) (((char *)op) - dst);
}
static int LZ4_compress_destSize_extState(
LZ4_stream_t *state,
const char *src,
char *dst,
int *srcSizePtr,
int targetDstSize)
{
#if LZ4_ARCH64
const tableType_t tableType = byU32;
#else
const tableType_t tableType = byPtr;
#endif
LZ4_resetStream(state);
if (targetDstSize >= LZ4_COMPRESSBOUND(*srcSizePtr)) {
/* compression success is guaranteed */
return LZ4_compress_fast_extState(
state, src, dst, *srcSizePtr,
targetDstSize, 1);
} else {
if (*srcSizePtr < LZ4_64Klimit)
return LZ4_compress_destSize_generic(
&state->internal_donotuse,
src, dst, srcSizePtr,
targetDstSize, byU16);
else
return LZ4_compress_destSize_generic(
&state->internal_donotuse,
src, dst, srcSizePtr,
targetDstSize, tableType);
}
}
int LZ4_compress_destSize(
const char *src,
char *dst,
int *srcSizePtr,
int targetDstSize,
void *wrkmem)
{
return LZ4_compress_destSize_extState(wrkmem, src, dst, srcSizePtr,
targetDstSize);
}
EXPORT_SYMBOL(LZ4_compress_destSize);
/*-******************************
* Streaming functions
********************************/
void LZ4_resetStream(LZ4_stream_t *LZ4_stream)
{
memset(LZ4_stream, 0, sizeof(LZ4_stream_t));
}
int LZ4_loadDict(LZ4_stream_t *LZ4_dict,
const char *dictionary, int dictSize)
{
LZ4_stream_t_internal *dict = &LZ4_dict->internal_donotuse;
const BYTE *p = (const BYTE *)dictionary;
const BYTE * const dictEnd = p + dictSize;
const BYTE *base;
if ((dict->initCheck)
|| (dict->currentOffset > 1 * GB)) {
/* Uninitialized structure, or reuse overflow */
LZ4_resetStream(LZ4_dict);
}
if (dictSize < (int)HASH_UNIT) {
dict->dictionary = NULL;
dict->dictSize = 0;
return 0;
}
if ((dictEnd - p) > 64 * KB)
p = dictEnd - 64 * KB;
dict->currentOffset += 64 * KB;
base = p - dict->currentOffset;
dict->dictionary = p;
dict->dictSize = (U32)(dictEnd - p);
dict->currentOffset += dict->dictSize;
while (p <= dictEnd - HASH_UNIT) {
LZ4_putPosition(p, dict->hashTable, byU32, base);
p += 3;
}
return dict->dictSize;
}
EXPORT_SYMBOL(LZ4_loadDict);
static void LZ4_renormDictT(LZ4_stream_t_internal *LZ4_dict,
const BYTE *src)
{
if ((LZ4_dict->currentOffset > 0x80000000) ||
((uptrval)LZ4_dict->currentOffset > (uptrval)src)) {
/* address space overflow */
/* rescale hash table */
U32 const delta = LZ4_dict->currentOffset - 64 * KB;
const BYTE *dictEnd = LZ4_dict->dictionary + LZ4_dict->dictSize;
int i;
for (i = 0; i < LZ4_HASH_SIZE_U32; i++) {
if (LZ4_dict->hashTable[i] < delta)
LZ4_dict->hashTable[i] = 0;
else
LZ4_dict->hashTable[i] -= delta;
}
LZ4_dict->currentOffset = 64 * KB;
if (LZ4_dict->dictSize > 64 * KB)
LZ4_dict->dictSize = 64 * KB;
LZ4_dict->dictionary = dictEnd - LZ4_dict->dictSize;
}
}
int LZ4_saveDict(LZ4_stream_t *LZ4_dict, char *safeBuffer, int dictSize)
{
LZ4_stream_t_internal * const dict = &LZ4_dict->internal_donotuse;
const BYTE * const previousDictEnd = dict->dictionary + dict->dictSize;
if ((U32)dictSize > 64 * KB) {
/* useless to define a dictionary > 64 * KB */
dictSize = 64 * KB;
}
if ((U32)dictSize > dict->dictSize)
dictSize = dict->dictSize;
memmove(safeBuffer, previousDictEnd - dictSize, dictSize);
dict->dictionary = (const BYTE *)safeBuffer;
dict->dictSize = (U32)dictSize;
return dictSize;
}
EXPORT_SYMBOL(LZ4_saveDict);
int LZ4_compress_fast_continue(LZ4_stream_t *LZ4_stream, const char *source,
char *dest, int inputSize, int maxOutputSize, int acceleration)
{
LZ4_stream_t_internal *streamPtr = &LZ4_stream->internal_donotuse;
const BYTE * const dictEnd = streamPtr->dictionary
+ streamPtr->dictSize;
const BYTE *smallest = (const BYTE *) source;
if (streamPtr->initCheck) {
/* Uninitialized structure detected */
return 0;
}
if ((streamPtr->dictSize > 0) && (smallest > dictEnd))
smallest = dictEnd;
LZ4_renormDictT(streamPtr, smallest);
if (acceleration < 1)
acceleration = LZ4_ACCELERATION_DEFAULT;
/* Check overlapping input/dictionary space */
{
const BYTE *sourceEnd = (const BYTE *) source + inputSize;
if ((sourceEnd > streamPtr->dictionary)
&& (sourceEnd < dictEnd)) {
streamPtr->dictSize = (U32)(dictEnd - sourceEnd);
if (streamPtr->dictSize > 64 * KB)
streamPtr->dictSize = 64 * KB;
if (streamPtr->dictSize < 4)
streamPtr->dictSize = 0;
streamPtr->dictionary = dictEnd - streamPtr->dictSize;
}
}
/* prefix mode : source data follows dictionary */
if (dictEnd == (const BYTE *)source) {
int result;
if ((streamPtr->dictSize < 64 * KB) &&
(streamPtr->dictSize < streamPtr->currentOffset)) {
result = LZ4_compress_generic(
streamPtr, source, dest, inputSize,
maxOutputSize, limitedOutput, byU32,
withPrefix64k, dictSmall, acceleration);
} else {
result = LZ4_compress_generic(
streamPtr, source, dest, inputSize,
maxOutputSize, limitedOutput, byU32,
withPrefix64k, noDictIssue, acceleration);
}
streamPtr->dictSize += (U32)inputSize;
streamPtr->currentOffset += (U32)inputSize;
return result;
}
/* external dictionary mode */
{
int result;
if ((streamPtr->dictSize < 64 * KB) &&
(streamPtr->dictSize < streamPtr->currentOffset)) {
result = LZ4_compress_generic(
streamPtr, source, dest, inputSize,
maxOutputSize, limitedOutput, byU32,
usingExtDict, dictSmall, acceleration);
} else {
result = LZ4_compress_generic(
streamPtr, source, dest, inputSize,
maxOutputSize, limitedOutput, byU32,
usingExtDict, noDictIssue, acceleration);
}
streamPtr->dictionary = (const BYTE *)source;
streamPtr->dictSize = (U32)inputSize;
streamPtr->currentOffset += (U32)inputSize;
return result;
}
}
EXPORT_SYMBOL(LZ4_compress_fast_continue);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("LZ4 compressor");
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...