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compr_kraken.cpp
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// This file is not GPL. It may be used for educational purposes only.
#include "stdafx.h"
#include "compr_kraken.h"
#include "compress.h"
#include "compr_util.h"
#include "compr_entropy.h"
#include <algorithm>
#include <memory>
#include "match_hasher.h"
#include "compr_match_finder.h"
struct KrakenRecentOffs {
KrakenRecentOffs() {
offs[4] = offs[5] = offs[6] = 8;
}
int offs[8];
};
struct KrakEncLz {
uint8 *lits_start;
uint8 *lits;
uint8 *sub_lits_start;
uint8 *sub_lits;
uint8 *tokens_start;
uint8 *tokens;
uint8 *u8_offs_start;
uint8 *u8_offs;
uint32 *u32_offs_start;
uint32 *u32_offs;
uint8 *lrl8_start;
uint8 *lrl8;
uint32 *len32_start;
uint32 *len32;
int src_len;
const uint8 *src_ptr;
int recent0;
int encode_flags;
};
static bool KrakIsMatchLongEnough(uint ml, uint offs) {
switch (ml) {
case 0:
case 1:
case 2: return false;
case 3: return offs < 0x4000;
case 4: return offs < 0x20000;
case 5: return offs < 0x100000;
case 6:
case 7: return offs < 0x400000;
default: return true;
}
}
enum IsRecent {
kOFFSET = 0,
kRECENT = 1,
};
struct Krak {
enum {
kMinBytesPerRound = 256,
kMaxBytesPerRound = 4096,
kRecentOffsetCount = 3,
};
struct Token {
int recent_offset0;
int litlen;
int matchlen;
int offset;
};
struct TokenArray {
Token *data;
int size, capacity;
};
struct State {
int best_bit_count;
int recent_offs[3];
int matchlen;
int litlen;
int quick_recent_matchlen_litlen;
int prev_state;
void Initialize() {
best_bit_count = 0;
recent_offs[0] = 8;
recent_offs[1] = 8;
recent_offs[2] = 8;
matchlen = 0;
litlen = 0;
prev_state = 0;
quick_recent_matchlen_litlen = 0;
}
};
struct CostModel {
int chunk_type;
int sub_or_copy_mask;
uint lit_cost[256];
uint token_cost[256];
int offs_encode_type;
uint offs_cost[256];
uint offs_lo_cost[256];
uint matchlen_cost[256];
};
struct Stats {
HistoU8 lit_raw;
HistoU8 lit_sub;
HistoU8 token;
HistoU8 matchlen;
int offs_encode_type;
HistoU8 offs;
HistoU8 offs_lo;
static void RescaleOne(HistoU8 *h) {
for (size_t i = 0; i != 256; i++)
h->count[i] = (h->count[i] >> 4) + 1;
}
static void Rescale(Stats *s) {
RescaleOne(&s->lit_raw);
RescaleOne(&s->lit_sub);
RescaleOne(&s->offs);
if (s->offs_encode_type > 1)
RescaleOne(&s->offs_lo);
RescaleOne(&s->token);
RescaleOne(&s->matchlen);
}
static void RescaleAddOne(HistoU8 *h, const HistoU8 *t) {
for (size_t i = 0; i != 256; i++)
h->count[i] = ((h->count[i] + t->count[i]) >> 5) + 1;
}
static void RescaleAdd(Stats *s, const Stats *t, bool chunk_type_same) {
if (chunk_type_same) {
RescaleAddOne(&s->lit_raw, &t->lit_raw);
RescaleAddOne(&s->lit_sub, &t->lit_sub);
} else {
RescaleOne(&s->lit_raw);
RescaleOne(&s->lit_sub);
}
RescaleAddOne(&s->token, &t->token);
RescaleAddOne(&s->matchlen, &t->matchlen);
if (s->offs_encode_type == t->offs_encode_type) {
RescaleAddOne(&s->offs, &t->offs);
if (s->offs_encode_type > 1)
RescaleAddOne(&s->offs_lo, &t->offs_lo);
} else {
s->offs = t->offs;
s->offs_lo = t->offs_lo;
s->offs_encode_type = t->offs_encode_type;
RescaleOne(&s->offs);
if (s->offs_encode_type > 1)
RescaleOne(&s->offs_lo);
}
}
static void ReduceIfHigh(Stats *s) {
// empty
}
static void Update(Stats *h, const uint8 *src, int pos, const Token *tokens, int num_token) {
enum {
kIncrement = 2
};
for (int i = 0; i < num_token; i++) {
const Token *t = &tokens[i];
int litlen = t->litlen;
int recent = t->recent_offset0;
for (int j = 0; j < litlen; j++) {
uint b = src[pos + j];
h->lit_raw.count[b] += kIncrement;
h->lit_sub.count[(uint8)(b - src[pos + j - recent])] += kIncrement;
}
pos += litlen + t->matchlen;
int length_field = litlen;
if (litlen >= 3) {
h->matchlen.count[std::min(litlen - 3, 255)] += kIncrement;
length_field = 3;
}
if (t->matchlen < 2) {
assert(t->matchlen >= 2);
continue;
}
uint offset = t->offset;
int recent_field;
if (t->offset <= 0) {
recent_field = -(int)offset;
} else {
recent_field = 3;
if (h->offs_encode_type == 0) {
if (offset >= 8388360) {
uint t = BSR(offset - 8322816) | 0xF0;
h->offs.count[t] += kIncrement;
} else {
uint t = ((offset - 8) & 0xF) + 16 * (BSR(offset - 8 + 256) - 8);
h->offs.count[t] += kIncrement;
}
} else if (h->offs_encode_type == 1) {
uint t = BSR(offset + 8) - 3;
uint u = 8 * t | (((offset + 8) >> t) ^ 8);
h->offs.count[u] += kIncrement;
} else {
uint ohi = offset / h->offs_encode_type, olo = offset % h->offs_encode_type;
uint t = BSR(ohi + 8) - 3;
uint u = 8 * t | (((ohi + 8) >> t) ^ 8);
h->offs.count[u] += kIncrement;
h->offs_lo.count[olo] += kIncrement;
}
}
int matchlen_field = t->matchlen - 2;
if (t->matchlen - 17 >= 0) {
h->matchlen.count[std::min(t->matchlen - 17, 255)] += kIncrement;
matchlen_field = 15;
}
int token_value = (matchlen_field << 2) + (recent_field << 6) + (length_field);
h->token.count[token_value] += kIncrement;
}
}
};
static void MakeCostModel(const Stats *h, CostModel *cm) {
ConvertHistoToCost(h->offs, cm->offs_cost, 36);
if (h->offs_encode_type > 1)
ConvertHistoToCost(h->offs_lo, cm->offs_lo_cost, 0);
ConvertHistoToCost(h->token, cm->token_cost, 18);
ConvertHistoToCost(h->matchlen, cm->matchlen_cost, 12);
if (cm->chunk_type == 1)
ConvertHistoToCost(h->lit_raw, cm->lit_cost, 0);
else
ConvertHistoToCost(h->lit_sub, cm->lit_cost, 0);
}
static __forceinline uint BitsForLitlen(CostModel &cost_model, int cur_litlen) {
if (cur_litlen < 3)
return 0;
if (cur_litlen - 3 >= 255) {
int v = BSR(((unsigned int)(cur_litlen - 3 - 255) >> 6) + 1);
return cost_model.matchlen_cost[255] + 32 * (2 * v + 7);
} else {
return cost_model.matchlen_cost[cur_litlen - 3];
}
}
static __forceinline uint BitsForLit(const uint8 *src, int pos, int recent, const CostModel &cm, int litidx) {
const uint8 *p = src + pos;
return cm.lit_cost[(uint8)(p[0] - (p[-recent] & cm.sub_or_copy_mask))];
}
static __forceinline uint BitsForLits(const uint8 *src, int pos, int num, int recent, const CostModel &cm, int litidx) {
const uint8 *p = src + pos;
uint sum = 0;
for (int i = 0; i < num; i++, p++)
sum += cm.lit_cost[(uint8)(p[0] - (p[-recent] & cm.sub_or_copy_mask))];
return sum;
}
static __forceinline bool CheckMatchValidLength(uint ml, uint offs) {
return (offs < 0x100000) || ((offs < 0x200000) ? (ml >= 5) : (offs < 0x400000) ? (ml >= 6) : (ml >= 8));
}
static __forceinline int GetMatchlengthQ(const uint8 *src, int offset, const uint8 *src_end, uint32 u32_at_cur) {
return ::GetMatchlengthQ(src, offset, src_end, u32_at_cur);
}
static __forceinline int GetMatchlengthMin2(const uint8 *src_ptr_cur, int offset, const uint8 *src_ptr_safe_end) {
return ::GetMatchlengthMin2(src_ptr_cur, offset, src_ptr_safe_end);
}
static __forceinline int BitsForToken(const CostModel &cost_model, int cur_matchlen, int cmd_offset, int recent_field, int length_field) {
if (cur_matchlen - 17 >= 0) {
int bits_for_matchlen;
if (cur_matchlen - 17 >= 255) {
int bsr = BSR(((unsigned int)(cur_matchlen - 17 - 255) >> 6) + 1);
bits_for_matchlen = cost_model.matchlen_cost[255] + 32 * (2 * bsr + 7);
} else {
bits_for_matchlen = cost_model.matchlen_cost[cur_matchlen - 17];
}
return cost_model.token_cost[(15 << 2) + (recent_field << 6) + length_field] + bits_for_matchlen;
} else {
return cost_model.token_cost[((cur_matchlen - 2) << 2) + (recent_field << 6) + length_field];
}
}
static uint BitsForOffset(const CostModel &cost_model, uint offs) {
if (cost_model.offs_encode_type == 0) {
if (offs >= 8388360) {
unsigned t = BSR(offs - 8322816) | 0xF0;
unsigned u = t - 224;
return cost_model.offs_cost[t] + 32 * u + 12;
} else {
unsigned t = ((offs - 8) & 0xF) + 16 * (BSR(offs - 8 + 256) - 8);
unsigned u = (t >> 4) + 4;
return cost_model.offs_cost[t] + 32 * u;
}
} else if (cost_model.offs_encode_type == 1) {
unsigned t = BSR(offs + 8) - 3;
unsigned u = 8 * t | (((offs + 8) >> t) ^ 8);
return cost_model.offs_cost[u] + 32 * (u >> 3);
} else {
unsigned ohi = offs / cost_model.offs_encode_type, olo = offs % cost_model.offs_encode_type;
unsigned t = BSR(ohi + 8) - 3;
unsigned u = 8 * t | (((ohi + 8) >> t) ^ 8);
return cost_model.offs_cost[u] + 32 * (u >> 3) + cost_model.offs_lo_cost[olo];
}
}
static __forceinline int GetRecentOffsetIndex(const int *arr, int offset) {
return (offset == arr[0]) ? 0 :
(offset == arr[1]) ? 1 :
(offset == arr[2]) ? 2 : -1;
}
};
static float GetTime_KrakenWriteBits(int platforms, int src_len, int tokens, int len8) {
return CombineCostComponents(platforms,
200.0f + src_len * 0.405f + tokens * 15.213f + len8 * 4.017f,
200.0f + src_len * 0.419f + tokens * 19.861f + len8 * 10.898f,
200.0f + src_len * 0.647f + tokens * 24.886f + len8 * 9.685f,
200.0f + src_len * 0.305f + tokens * 13.591f + len8 * 4.394f);
}
static double GetTime_KrakenLengths(int platforms, int len8, int len32) {
return CombineCostComponents(platforms,
42.933f + len8 * 0.478f + len32 * 21.527f,
36.646f + len8 * 0.746f + len32 * 32.345f,
115.731f + len8 * 0.815f + len32 * 36.682f,
48.796f + len8 * 0.453f + len32 * 20.770f);
}
static int Kraken_EncodeLzArrays(float *cost_ptr, int *chunk_type_ptr, Krak::Stats *stats,
uint8 *dst, uint8 *dst_end,
LzCoder *lzcoder, LzTemp *lztemp,
KrakEncLz *kl, int start_pos) {
uint8 *dst_org = dst;
if (stats)
memset(stats, 0, sizeof(*stats));
const uint8 *src_ptr = kl->src_ptr;
int src_len = kl->src_len;
int initial_bytes = start_pos == 0 ? 8 : 0;
for (int i = 0; i < initial_bytes; i++)
*dst++ = src_ptr[i];
int level = lzcoder->compression_level;
int flag_ignore_u32_length = 0;
int extra_size = 0;
assert((lzcoder->encode_flags & 1) == 0);
int num_lits = kl->lits - kl->lits_start;
float lit_cost = kInvalidCost;
float memcpy_cost = num_lits + 3;
if (num_lits < 32 || level <= -4) {
*chunk_type_ptr = 1;
int n = EncodeArrayU8_Memcpy(dst, dst_end, kl->lits_start, num_lits);
if (n < 0)
return src_len;
dst += n;
lit_cost = memcpy_cost;
} else {
HistoU8 lits_histo, litsub_histo;
bool has_litsub = (kl->sub_lits != kl->sub_lits_start);
CountBytesHistoU8(kl->lits_start, num_lits, &lits_histo);
if (has_litsub)
CountBytesHistoU8(kl->sub_lits_start, num_lits, &litsub_histo);
if (stats) {
stats->lit_raw = lits_histo;
if (has_litsub)
stats->lit_sub = litsub_histo;
}
int lit_n = -1;
bool skip_normal_lit = false;
if (has_litsub) {
float litsub_extra_cost = CombineCostComponents1(lzcoder->platforms, num_lits,
0.14399999f, 0.292f, 0.322f, 0.129f) * lzcoder->speed_tradeoff;
bool skip_litsub = (level < 6) && (GetHistoCostApprox(lits_histo, num_lits) * 0.125f <=
GetHistoCostApprox(litsub_histo, num_lits) * 0.125f + litsub_extra_cost);
if (!skip_litsub) {
*chunk_type_ptr = 0;
float litsub_cost = kInvalidCost;
lit_n = EncodeArrayU8WithHisto(dst, dst_end, kl->sub_lits_start, num_lits, litsub_histo,
lzcoder->entropy_opts, lzcoder->speed_tradeoff, lzcoder->platforms,
&litsub_cost, level);
litsub_cost += litsub_extra_cost;
if (lit_n > 0 && lit_n < num_lits && litsub_cost <= memcpy_cost) {
lit_cost = litsub_cost;
if (level < 6)
skip_normal_lit = true;
}
}
}
if (!skip_normal_lit) {
int n = EncodeArrayU8WithHisto(dst, dst_end, kl->lits_start, num_lits, lits_histo,
lzcoder->entropy_opts, lzcoder->speed_tradeoff, lzcoder->platforms,
&lit_cost, level);
if (n > 0) {
lit_n = n;
*chunk_type_ptr = 1;
}
}
if (lit_n < 0)
return src_len;
dst += lit_n;
}
float token_cost = kInvalidCost;
int n = EncodeArrayU8(dst, dst_end, kl->tokens_start, kl->tokens - kl->tokens_start,
lzcoder->entropy_opts, lzcoder->speed_tradeoff, lzcoder->platforms,
&token_cost, level, stats ? &stats->token : NULL);
if (n < 0)
return src_len;
dst += n;
int offs_encode_type = 0;
float offs_cost = kInvalidCost;
n = EncodeLzOffsets(dst, dst_end, kl->u8_offs_start, kl->u32_offs_start, kl->u8_offs - kl->u8_offs_start,
lzcoder->entropy_opts, lzcoder->speed_tradeoff, lzcoder->platforms,
&offs_cost, 8, (lzcoder->encode_flags & 4), &offs_encode_type, level,
stats ? &stats->offs : NULL, stats ? &stats->offs_lo : NULL);
if (n < 0)
return src_len;
dst += n;
if (stats)
stats->offs_encode_type = offs_encode_type;
float lrl8_cost = kInvalidCost;
n = EncodeArrayU8(dst, dst_end, kl->lrl8_start, kl->lrl8 - kl->lrl8_start,
lzcoder->entropy_opts, lzcoder->speed_tradeoff, lzcoder->platforms,
&lrl8_cost, level, stats ? &stats->matchlen : NULL);
if (n < 0)
return src_len;
dst += n;
int lrl_num = kl->lrl8 - kl->lrl8_start;
int offs_num = kl->u8_offs - kl->u8_offs_start;
int tok_num = kl->tokens - kl->tokens_start;
int required = std::max(lrl_num, offs_num) + lrl_num + num_lits + 4 * lrl_num + 6 * offs_num + tok_num + 16;
required = std::max(std::max(required, 2 * num_lits), num_lits + 2 * tok_num) + 0xd000;
int scratch_available = std::min(3 * src_len + 32 + 0xd000, 0x6C000);
if (required > scratch_available) {
assert(required <= scratch_available);
return src_len;
}
n = WriteLzOffsetBits(dst, dst_end, kl->u8_offs_start, kl->u32_offs_start, offs_num, offs_encode_type,
kl->len32_start, kl->len32 - kl->len32_start,
flag_ignore_u32_length, extra_size);
if (n < 0)
return src_len;
dst += n;
if (dst - dst_org >= src_len)
return src_len;
float bits_cost = GetTime_KrakenWriteBits(lzcoder->platforms, src_len, tok_num, lrl_num) *
lzcoder->speed_tradeoff + (initial_bytes + flag_ignore_u32_length + n);
float cost = token_cost + lit_cost + offs_cost + lrl8_cost + bits_cost;
*cost_ptr = GetTime_KrakenLengths(lzcoder->platforms, lrl_num, kl->len32 - kl->len32_start) *
lzcoder->speed_tradeoff + cost;
return dst - dst_org;
}
static void KrakEncLz_Init(KrakEncLz *kl, LzTemp *lztemp, int src_len, const uint8 *src_base, int encode_flags) {
kl->src_ptr = src_base;
kl->src_len = src_len;
size_t nlits = src_len + 8;
size_t ntokens = src_len / 2 + 8;
size_t nu8offs = src_len / 3;
size_t nu32offs = src_len / 3;
size_t nlen8 = src_len / 5;
size_t nlen32 = src_len / 256;
uint8 *p = (uint8*)lztemp->scratch0.Allocate(nlits * 2 + ntokens + nu8offs + nu32offs * 4 + nlen8 + nlen32 * 4 + 256);
kl->lits_start = kl->lits = p, p += nlits;
kl->sub_lits_start = kl->sub_lits = p, p += nlits;
kl->tokens_start = kl->tokens = p, p += ntokens;
kl->u8_offs = kl->u8_offs_start = p, p += nu8offs;
p = AlignPointer<uint8*>(p, 4);
kl->u32_offs = kl->u32_offs_start = (uint32*)p, p += nu32offs * 4;
kl->lrl8 = kl->lrl8_start = p, p += nlen8;
p = AlignPointer<uint8*>(p, 4);
kl->len32 = kl->len32_start = (uint32*)p;
kl->recent0 = 8;
kl->encode_flags = encode_flags;
}
static inline int KrakEnk_WriteMatchLen(KrakEncLz &kl, int ml) {
int ml_token = ml - 2;
if (ml_token >= 15) {
ml_token = 15;
if (ml >= 255 + 17) {
*kl.lrl8++ = 255;
*kl.len32++ = ml - 255 - 17;
} else {
*kl.lrl8++ = ml - 17;
}
}
return ml_token << 2;
}
template<bool DoSubtract>
static void KrakEnc_WriteLitsLong(KrakEncLz &kl, const uint8 *p, size_t len) {
if (DoSubtract) {
SubtractBytesUnsafe(kl.sub_lits, p, len, -kl.recent0);
kl.sub_lits += len;
}
uint8 *d = kl.lits, *d_end = d + len;
do {
*(uint32*)d = *(uint32*)p;
d += 4, p += 4;
} while (d < d_end);
kl.lits = d_end;
if (len >= 258) {
*kl.lrl8++ = 255;
*kl.len32++ = len - 258;
} else {
*kl.lrl8++ = (uint8)(len - 3);
}
}
template<bool DoSubtract>
static inline int KrakEnc_WriteLits(KrakEncLz &kl, const uint8 *p, size_t len) {
if (len == 0)
return 0;
if (len > 8) {
KrakEnc_WriteLitsLong<DoSubtract>(kl, p, len);
return 3;
}
uint8 *lrl8 = kl.lrl8;
*lrl8 = (uint8)(len - 3);
kl.lrl8 = (len >= 3) ? lrl8 + 1 : lrl8;
uint8 *ll = kl.lits;
*(uint64*)ll = *(uint64*)p;
kl.lits = ll + len;
if (DoSubtract) {
uint8 *sl = kl.sub_lits;
simde_mm_storel_epi64((simde__m128i *)sl,
simde_mm_sub_epi8(simde_mm_loadl_epi64((const simde__m128i *)p),
simde_mm_loadl_epi64((const simde__m128i *)&p[-kl.recent0])));
kl.sub_lits = sl + len;
}
return std::min<int>(len, 3);
}
static inline void KrakEnc_WriteFarOffs(KrakEncLz &kl, uint32 offs) {
int bsr = BSR(offs - 8322816);
*kl.u8_offs++ = bsr | 0xf0;
*kl.u32_offs++ = offs;
}
static inline void KrakEnc_WriteNearOffs(KrakEncLz &kl, uint32 offs) {
int bsr = BSR(offs + 248);
*kl.u8_offs++ = ((offs - 8) & 0xF) | 16 * (bsr - 8);
*kl.u32_offs++ = offs;
}
static inline void KrakEnc_WriteOffs(KrakEncLz &kl, uint32 offs) {
if (offs >= 8388360)
KrakEnc_WriteFarOffs(kl, offs);
else
KrakEnc_WriteNearOffs(kl, offs);
}
template<bool DoRecent, bool DoSubtract>
static inline void KrakEnc_AddToken(KrakEncLz &kl, KrakenRecentOffs &recent, const uint8 *litstart, size_t litlen, int matchlen, int offs_or_recent) {
int token = KrakEnc_WriteLits<DoSubtract>(kl, litstart, litlen);
token += KrakEnk_WriteMatchLen(kl, matchlen);
if (offs_or_recent > 0) {
token += 3 << 6;
if (DoRecent) {
recent.offs[6] = recent.offs[5];
recent.offs[5] = recent.offs[4];
recent.offs[4] = offs_or_recent;
}
kl.recent0 = offs_or_recent;
KrakEnc_WriteOffs(kl, offs_or_recent);
} else {
if (DoRecent) {
size_t idx = -offs_or_recent;
assert(idx >= 0 && idx <= 2);
token += idx << 6;
int v = recent.offs[idx + 4];
recent.offs[idx + 4] = recent.offs[idx + 3];
recent.offs[idx + 3] = recent.offs[idx + 2];
recent.offs[4] = v;
kl.recent0 = v;
}
}
*kl.tokens++ = token;
}
template<bool DoSubtract>
static inline void KrakEnc_AddFinal(KrakEncLz &kl, const uint8 *p, const uint8 *pend) {
size_t len = pend - p;
if (len) {
memcpy(kl.lits, p, len);
kl.lits += len;
if (DoSubtract) {
SubtractBytes(kl.sub_lits, p, len, -kl.recent0);
kl.sub_lits += len;
}
}
}
template<int Level, typename Hasher>
int KrakenCompressVeryfast(LzCoder *coder, LzTemp *lztemp, MatchLenStorage *mls_unused,
const uint8 *src, int src_size,
uint8 *dst, uint8 *dst_end,
int start_pos, int *chunk_type_ptr, float *cost_ptr) {
enum {
SkipFactor = (Level >= 1) ? 5 : (Level >= -2) ? 4 : 3,
DoRecent = Level >= 1,
DoSubtract = Level >= -1,
};
*chunk_type_ptr = -1;
if (src_size <= 128)
return -1;
uint dict_size = coder->opts->dictionarySize > 0 && coder->opts->dictionarySize <= 0x40000000 ?
coder->opts->dictionarySize : 0x40000000;
KrakEncLz kl;
KrakEncLz_Init(&kl, lztemp, src_size, src, coder->encode_flags);
int initial_copy_bytes = (start_pos == 0) ? 8 : 0;
const uint8 *src_end_minus8 = src + src_size - 8;
const uint8 *src_end_minus16 = src + src_size - 16;
int skip = 1 << SkipFactor;
const uint8 *src_cur = src + initial_copy_bytes;
const uint8 *src_end = src + src_size;
const uint8 *litstart = src_cur;
Hasher *hasher = (Hasher*)coder->hasher;
KrakenRecentOffs recent;
int last_offs = -8;
const uint8 *src_base = hasher->src_base_;
uint64 hashmult = hasher->hashmult_;
typename Hasher::ElemType *hash_ptr = hasher->hash_ptr_, *hash;
int hashshift = 64 - hasher->hash_bits_;
const uint8 *src_cur_next;
while ((skip >> SkipFactor) < src_end_minus16 - src_cur) {
src_cur_next = src_cur + (skip >> SkipFactor);
if (Level >= 0) {
hash = &hash_ptr[(size_t)(*(uint64*)src_cur_next * hashmult >> hashshift)];
simde_mm_prefetch((char*)hash, SIMDE_MM_HINT_T0);
}
hash = &hash_ptr[(size_t)(*(uint64*)src_cur * hashmult >> hashshift)];
uint32 u32_at_cur = *(uint32*)src_cur;
uint32 hashval = *hash;
*hash = src_cur - src_base;
int offs, offs_or_recent;
const uint8 *matchstart;
if (Level >= 1 && (uint16)u32_at_cur == *(uint16*)&src_cur[-recent.offs[5]]) {
offs = -recent.offs[5];
offs_or_recent = -1;
matchstart = src_cur;
src_cur += 2;
} else if (Level >= 1 && (uint16)u32_at_cur == *(uint16*)&src_cur[-recent.offs[6]]) {
offs = -recent.offs[6];
offs_or_recent = -2;
matchstart = src_cur;
src_cur += 2;
} else if (!((u32_at_cur ^ *(uint32*)&src_cur[last_offs]) & 0xffffff00)) {
src_cur += 1;
offs = last_offs;
offs_or_recent = 0;
matchstart = src_cur;
hash_ptr[(size_t)(*(uint64*)src_cur * hashmult >> hashshift)] = src_cur - src_base;
src_cur += 3;
} else {
offs_or_recent = (typename Hasher::ElemType)(src_cur - src_base - hashval);
if (u32_at_cur != *(uint32*)&src_cur[-offs_or_recent])
goto no_match;
if ((uint)(offs_or_recent - 8) < (uint)(dict_size - 8)) {
offs = -offs_or_recent;
} else if (u32_at_cur == *(uint32*)(src_cur - 8)) {
offs = -8;
offs_or_recent = 8;
} else {
no_match:
if (Level >= -2)
skip++;
else
skip = std::min<int>(skip + ((src_cur - litstart) >> 1), 296);
src_cur = src_cur_next;
continue;
}
// Reduce literal length and increase match length for bytes preceding the match.
if (Level >= -2) {
while (src_cur > litstart && (src_base - src_cur) < offs &&
src_cur[-1] == src_cur[offs - 1])
src_cur--;
}
matchstart = src_cur;
src_cur += 4;
}
// compute length of it
for (; src_cur < src_end - 8; src_cur += 4) {
uint32 v = *(uint32*)src_cur ^ *(uint32*)(src_cur + offs);
if (v != 0) {
src_cur += (BSF(v) >> 3);
break;
}
}
src_cur = std::min(src_cur, src_end - 8);
assert(matchstart >= litstart);
int ml = src_cur - matchstart;
KrakEnc_AddToken<DoRecent, DoSubtract>(kl, recent, litstart, matchstart - litstart, ml, offs_or_recent);
litstart = src_cur;
last_offs = offs;
if (src_cur >= src_end - 16)
break;
if (Level >= 0) {
for (int i = 1; i < ml; i *= 2)
hash_ptr[(size_t)(*(uint64*)(i + matchstart) * hashmult >> hashshift)] = i + matchstart - src_base;
}
skip = 1 << SkipFactor;
}
KrakEnc_AddFinal<DoSubtract>(kl, litstart, src_end);
return Kraken_EncodeLzArrays(cost_ptr, chunk_type_ptr, NULL, dst, dst_end, coder, lztemp, &kl, start_pos);
}
static __forceinline void KrakCheckRecentMatch(const uint8 *src, const uint8 *src_end, uint32 u32, KrakenRecentOffs &recent, int idx, int &best_ml, int &best_off) {
int ml = GetMatchlengthQ(src, recent.offs[4 + idx], src_end, u32);
if (ml > best_ml)
best_ml = ml, best_off = idx;
}
template<typename Hasher>
static __forceinline LengthAndOffset KrakenFast_GetMatch(const uint8 *cur_ptr, const uint8 *src_end_safe, const uint8 *lit_start,
KrakenRecentOffs &recent, Hasher *hasher,
const uint8 *next_cur_ptr, int dict_size, int min_match_length) {
typename Hasher::HashPos hp = hasher->GetHashPos(cur_ptr);
uint32 u32_at_src = *(uint32*)cur_ptr;
hasher->SetHashPosPrefetch(next_cur_ptr);
int recent_ml = 0, recent_off = -1;
KrakCheckRecentMatch(cur_ptr, src_end_safe, u32_at_src, recent, 0, recent_ml, recent_off);
KrakCheckRecentMatch(cur_ptr, src_end_safe, u32_at_src, recent, 1, recent_ml, recent_off);
KrakCheckRecentMatch(cur_ptr, src_end_safe, u32_at_src, recent, 2, recent_ml, recent_off);
int best_offs = 0, best_ml = 0;
// If we found a recent offset at least 4 bytes long then use it.
if (recent_ml >= 4) {
hasher->Insert(hp);
best_offs = -recent_off, best_ml = recent_ml;
} else {
// Make decompression faster by skipping short recent matches
if (cur_ptr - lit_start >= 56) {
if (recent_ml <= 2)
recent_ml = 0;
min_match_length = std::max(min_match_length, 5);
}
int max_ml = 0;
uint32 *cur_hash_ptr = hp.ptr1;
for (;;) {
for (size_t hashidx = 0; hashidx != Hasher::NumHash; hashidx++) {
if ((cur_hash_ptr[hashidx] & 0xfc000000) == (hp.hi & 0xfc000000)) {
int cur_offs = (hp.pos - cur_hash_ptr[hashidx]) & 0x3ffffff;
if (cur_offs < dict_size) {
cur_offs = std::max(cur_offs, 8);
if (*(uint32*)(cur_ptr - cur_offs) == u32_at_src &&
(max_ml < 4 || (cur_ptr + max_ml < src_end_safe && *(cur_ptr + max_ml) == *(cur_ptr + max_ml - cur_offs)))) {
int cur_ml = 4 + CountMatchingBytes(cur_ptr + 4, src_end_safe, cur_offs);
if (cur_ml > max_ml && cur_ml >= min_match_length) {
max_ml = cur_ml;
if (KrakIsMatchLongEnough(cur_ml, cur_offs) && IsMatchBetter(cur_ml, cur_offs, best_ml, best_offs))
best_offs = cur_offs, best_ml = cur_ml;
}
}
}
}
}
if (!Hasher::DualHash || cur_hash_ptr == hp.ptr2)
break;
cur_hash_ptr = hp.ptr2;
}
hasher->Insert(hp);
if (!IsBetterThanRecent(recent_ml, best_ml, best_offs))
best_offs = -recent_off, best_ml = recent_ml;
}
LengthAndOffset match = { best_ml, best_offs };
return match;
}
template<int NumHash, bool DualHash, int NumLazy>
int KrakenCompressFast(LzCoder *lzcoder, LzTemp *lztemp,
const uint8 *src, int src_len, uint8 *dst, uint8 *dst_end,
int start_pos, int *chunk_type_ptr, float *cost_ptr) {
const uint8 *src_end = src + src_len;
KrakEncLz kl;
KrakenRecentOffs recent;
*chunk_type_ptr = -1;
if (src_len <= 128)
return src_len;
int dict_size = lzcoder->opts->dictionarySize;
dict_size = (dict_size <= 0) ? 0x40000000 : std::min(dict_size, 0x40000000);
int min_match_length = std::max(lzcoder->opts->min_match_length, 4);
int initial_copy_bytes = (start_pos == 0) ? 8 : 0;
KrakEncLz_Init(&kl, lztemp, src_len, src, lzcoder->encode_flags);
int recent0 = 8;
const uint8 *cur_ptr = src + initial_copy_bytes, *litstart = cur_ptr;
typedef MatchHasher<NumHash, DualHash> Hasher;
Hasher *hasher = (Hasher *)lzcoder->hasher;
hasher->SetHashPos(cur_ptr);
uint skip = 256;
LengthAndOffset m;
for(;;) {
if ((NumHash == 1) && *(uint32*)(cur_ptr + 1) == *(uint32*)(cur_ptr + 1 - recent0)) {
int len = CountMatchingBytes(cur_ptr + 5, src_end - 8, recent0) + 4;
typename Hasher::HashPos hp = hasher->GetHashPos(cur_ptr);
hasher->SetHashPosPrefetch(cur_ptr + 2);
hasher->Insert(hp);
cur_ptr += 1;
m.offset = 0;
m.length = len;
} else {
uint increment = (NumHash == 1) ? skip >> 8 : 1;
const uint8 *next_ptr = cur_ptr + increment;
if (src_end - 16 - cur_ptr <= increment)
break;
m = KrakenFast_GetMatch(cur_ptr, src_end - 8, litstart, recent, hasher, next_ptr, dict_size, min_match_length);
if (m.length < 2) {
cur_ptr = next_ptr;
skip++;
continue;
}
if (NumLazy >= 1) {
while (cur_ptr + 1 < src_end - 16) {
LengthAndOffset m1 = KrakenFast_GetMatch(cur_ptr + 1, src_end - 8, litstart, recent, hasher, cur_ptr + 2, dict_size, min_match_length);
if (m1.length >= 2 && GetLazyScore(m1, m) > 0) {
cur_ptr += 1; // lazy1 is better
m = m1;
} else {
if (NumLazy < 2 || cur_ptr + 2 >= src_end - 16 || m.length == 2)
break;
LengthAndOffset m2 = KrakenFast_GetMatch(cur_ptr + 2, src_end - 8, litstart, recent, hasher, cur_ptr + 3, dict_size, min_match_length);
if (m2.length >= 2 && GetLazyScore(m2, m) > 3) {
cur_ptr += 2; // lazy2 is better
m = m2;
} else {
break;
}
}
}
}
}
assert(m.offset >= -2);
ptrdiff_t actual_offs = (m.offset <= 0) ? recent.offs[-m.offset + 4] : m.offset;
// Reduce literal length and increase match length for bytes preceding the match.
while (cur_ptr > litstart && cur_ptr - hasher->src_base_ > actual_offs && cur_ptr[-1] == cur_ptr[-actual_offs - 1])
cur_ptr--, m.length++;
if (m.offset == 0 && cur_ptr == litstart)
m.offset = -1;
KrakEnc_AddToken<true,true>(kl, recent, litstart, cur_ptr - litstart, m.length, m.offset);
cur_ptr += m.length;
litstart = cur_ptr;
if (cur_ptr >= src_end - 16)
break;
recent0 = kl.recent0;
hasher->InsertRange(cur_ptr - m.length, m.length);
skip = 256;
}
KrakEnc_AddFinal<true>(kl, litstart, src_end);
return Kraken_EncodeLzArrays(cost_ptr, chunk_type_ptr, NULL, dst, dst_end, lzcoder, lztemp, &kl, start_pos);
}
static LengthAndOffset KrakenGetLzMatch(const LengthAndOffset *matches, KrakenRecentOffs *recents,
const uint8 *src, const uint8 *src_end,
int min_match_len, int arg_14,
const uint8 *window_base, int max_match_offset) {
uint32 m32 = *(uint32*)src;
int best_ml = 0, best_offs = 0, ml;
LengthAndOffset result;
if ((ml = Krak::GetMatchlengthQ(src, recents->offs[4], src_end, m32)) > best_ml)
best_ml = ml, best_offs = 0;
if ((ml = Krak::GetMatchlengthQ(src, recents->offs[5], src_end, m32)) > best_ml)
best_ml = ml, best_offs = -1;
if ((ml = Krak::GetMatchlengthQ(src, recents->offs[6], src_end, m32)) > best_ml)
best_ml = ml, best_offs = -2;
if (best_ml < 4) {
if (arg_14 >= 56) {
if (best_ml <= 2)
best_ml = 0;
min_match_len++;
}
uint best_m_ml = 0, best_m_offs = 0;
for (size_t i = 0; i != 4; i++) {
uint ml = matches[i].length;
if (ml < min_match_len)
break;
if (ml > src_end - src && (ml = src_end - src) < min_match_len)
break;
uint offs = matches[i].offset;
if (offs >= max_match_offset)
continue;
// Since decoder copies in 64-bit chunks we cannot support copies
// that are longer than the offset, if offset is less than 8.
if (offs < 8) {
// Expand the offset to at least 8 bytes long
uint tt = offs;
do offs += tt; while (offs < 8);
// Check if it's a valid offset and still match
if (offs > src - window_base)
continue;
ml = GetMatchlengthQMin3(src, offs, src_end, m32);
if (ml < min_match_len)
continue;
}
if (KrakIsMatchLongEnough(ml, offs) && IsMatchBetter(ml, offs, best_m_ml, best_m_offs)) {
best_m_offs = offs;
best_m_ml = ml;
}
}
if (IsBetterThanRecent(best_ml, best_m_ml, best_m_offs)) {
best_ml = best_m_ml;
best_offs = best_m_offs;
}
}
result.length = best_ml;
result.offset = best_offs;
return result;
}
static int RunKrakenMatcherToGetStats(float *cost_ptr, int *chunk_type_ptr, Krak::Stats *stats,
uint8 *dst_ptr, uint8 *dst_end,
int min_match_len,
LzCoder *lzcoder, LengthAndOffset *lao,
const uint8 *src_ptr, int src_len, int start_pos, const uint8 *window_base,
LzTemp *lztemp) {
memset(stats, 0, sizeof(*stats));
KrakenRecentOffs recent;
KrakEncLz kl;
KrakEncLz_Init(&kl, lztemp, src_len, src_ptr, lzcoder->encode_flags);
int initial_copy_bytes = (start_pos == 0) ? 8 : 0;
int pos = initial_copy_bytes, last_pos = initial_copy_bytes;
int dict_size = lzcoder->opts->dictionarySize > 0 && lzcoder->opts->dictionarySize <= 0x40000000 ? lzcoder->opts->dictionarySize : 0x40000000;
while (pos < src_len - 16) {
LengthAndOffset m0 = KrakenGetLzMatch(&lao[4 * pos], &recent, &src_ptr[pos], &src_ptr[src_len - 8],
min_match_len, pos - last_pos, window_base, dict_size);
if (m0.length == 0) {
pos++;
continue;
}
while (pos + 1 < src_len - 16) {
LengthAndOffset m1 = KrakenGetLzMatch(&lao[4 * (pos + 1)], &recent, &src_ptr[pos + 1], &src_ptr[src_len - 8],
min_match_len, pos + 1 - last_pos, window_base, dict_size);
if (m1.length && GetLazyScore(m1, m0) > 0) {