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Refactor some code in LzmaDec.c

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This commit is contained in:
twinaphex 2014-10-21 18:17:58 +02:00
parent 323e3963da
commit 526be852fe
1 changed files with 62 additions and 24 deletions
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86
deps/7zip/LzmaDec.c vendored
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@ -17,7 +17,7 @@
#define LZMADEC_NORMALIZE if (range < kTopValue) { range <<= 8; code = (code << 8) | (*buf++); }
#define LZMADEC_IF_BIT_0(p) ttt = *(p); LZMADEC_NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
#define LZMADEC_IF_BIT_0(prob) ttt = *(prob); LZMADEC_NORMALIZE; bound = (range >> kNumBitModelTotalBits) * ttt; if (code < bound)
#define UPDATE_0(p) range = bound; *(p) = (uint16_t)(ttt + ((kBitModelTotal - ttt) >> kNumMoveBits));
#define LZMADEC_UPDATE_1(p) range -= bound; code -= bound; *(p) = (uint16_t)(ttt - (ttt >> kNumMoveBits));
#define GET_BIT2(p, i, A0, A1) LZMADEC_IF_BIT_0(p) \
@ -159,7 +159,11 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
unsigned posState = processedPos & pbMask;
prob = probs + IsMatch + (state << kNumPosBitsMax) + posState;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
unsigned symbol;
UPDATE_0(prob);
@ -199,7 +203,12 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
{
LZMADEC_UPDATE_1(prob);
prob = probs + IsRep + state;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(prob);
state += kNumStates;
@ -211,11 +220,21 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
if (checkDicSize == 0 && processedPos == 0)
return SZ_ERROR_DATA;
prob = probs + IsRepG0 + state;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(prob);
prob = probs + IsRep0Long + (state << kNumPosBitsMax) + posState;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(prob);
dic[dicPos] = dic[(dicPos - rep0) + ((dicPos < rep0) ? dicBufSize : 0)];
@ -231,7 +250,12 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
uint32_t distance;
LZMADEC_UPDATE_1(prob);
prob = probs + IsRepG1 + state;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(prob);
distance = rep1;
@ -240,7 +264,12 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
{
LZMADEC_UPDATE_1(prob);
prob = probs + IsRepG2 + state;
LZMADEC_IF_BIT_0(prob)
ttt = *(prob);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(prob);
distance = rep2;
@ -262,7 +291,11 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
{
unsigned limit, offset;
uint16_t *probLen = prob + LenChoice;
LZMADEC_IF_BIT_0(probLen)
ttt = *(probLen);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(probLen);
probLen = prob + LenLow + (posState << kLenNumLowBits);
@ -273,7 +306,11 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
{
LZMADEC_UPDATE_1(probLen);
probLen = prob + LenChoice2;
LZMADEC_IF_BIT_0(probLen)
ttt = *(probLen);
LZMADEC_NORMALIZE;
bound = (range >> kNumBitModelTotalBits) * ttt;
if (code < bound)
{
UPDATE_0(probLen);
probLen = prob + LenMid + (posState << kLenNumMidBits);
@ -408,22 +445,23 @@ static int MY_FAST_CALL LzmaDec_DecodeReal(CLzmaDec *p, size_t limit, const uint
}
}
}
}
while (dicPos < limit && buf < bufLimit);
LZMADEC_NORMALIZE;
p->buf = buf;
p->range = range;
p->code = code;
p->remainLen = len;
p->dicPos = dicPos;
p->processedPos = processedPos;
p->reps[0] = rep0;
p->reps[1] = rep1;
p->reps[2] = rep2;
p->reps[3] = rep3;
p->state = state;
}while (dicPos < limit && buf < bufLimit);
return SZ_OK;
LZMADEC_NORMALIZE;
p->buf = buf;
p->range = range;
p->code = code;
p->remainLen = len;
p->dicPos = dicPos;
p->processedPos = processedPos;
p->reps[0] = rep0;
p->reps[1] = rep1;
p->reps[2] = rep2;
p->reps[3] = rep3;
p->state = state;
return SZ_OK;
}
static void MY_FAST_CALL LzmaDec_WriteRem(CLzmaDec *p, size_t limit)