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compr_mermaid.cpp
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compr_mermaid.cpp
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// This file is not GPL. It may be used for educational purposes only.
#include "stdafx.h"
#include "compr_mermaid.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 MermaidWriter {
uint8 *lit_start;
uint8 *lit_cur;
uint8 *litsub_start;
uint8 *litsub_cur;
uint8 *token_start;
uint8 *token_cur;
uint16 *off16_start;
uint16 *off16_cur;
uint8 *off32_start;
uint8 *off32_cur;
uint8 *length_start;
uint8 *length_cur;
int complex_token_count;
int off32_count;
int src_len;
const uint8 *src_ptr;
int cur_block_start_2;
int block1_size;
int block2_size;
int tok_stream_2_offs;
int off32_count_1;
int off32_count_2;
};
void MermaidWriter_Init(MermaidWriter *mw, uint src_len, const uint8 *src, bool use_litsub) {
mw->src_ptr = src;
mw->src_len = src_len;
mw->complex_token_count = 0;
mw->off32_count = 0;
uint lit_size = src_len + 8;
uint token_size = src_len / 2 + 8;
uint off16_size = src_len / 3;
uint off32_size = src_len / 8;
uint length_size = src_len / 29;
uint total_size = lit_size + token_size + off16_size * 2 + length_size + off32_size * 4 + 256;
if (use_litsub)
total_size += lit_size;
uint8 *temp = new uint8[total_size];
mw->lit_start = mw->lit_cur = temp;
temp += lit_size;
if (use_litsub) {
mw->litsub_start = mw->litsub_cur = temp;
temp += lit_size;
} else {
mw->litsub_start = mw->litsub_cur = NULL;
}
mw->token_start = mw->token_cur = temp;
temp += token_size;
mw->off16_start = mw->off16_cur = (uint16*)temp;
temp += (size_t)off16_size * 2;
mw->off32_start = mw->off32_cur = temp;
temp += (size_t)off32_size * 4;
mw->length_start = mw->length_cur = temp;
temp += length_size;
mw->tok_stream_2_offs = 0;
mw->off32_count_1 = mw->off32_count_2 = 0;
mw->block1_size = std::min<uint>(src_len, 0x10000);
mw->block2_size = src_len - mw->block1_size;
}
static inline const uint8 *MermaidMatchLength(const uint8 *src, const uint8 *src_end, ptrdiff_t last_offs) {
while (src < src_end) {
uint32 xorval = *(uint32*)src ^ *(uint32*)(src + last_offs);
src += 4;
if (xorval) {
src = src + (BSF(xorval) >> 3) - 4;
break;
}
}
return std::min(src, src_end);
}
static inline void CopyBytesUnsafe(uint8 *dst, const uint8 *src, size_t n) {
uint8 *dst_end = dst + n;
do {
*(uint32*)dst = *(uint32*)src;
dst += 4, src += 4;
} while (dst < dst_end);
}
static inline void Mermaid_WriteLenValue(MermaidWriter &mw, uint t) {
uint8 *len_ptr = mw.length_cur;
if (t > 251) {
*len_ptr = (t & 3) - 4;
*(uint16*)(len_ptr + 1) = (t - ((t & 3) + 252)) >> 2;
len_ptr += 3;
} else {
*len_ptr++ = t;
}
mw.length_cur = len_ptr;
}
static inline void Mermaid_WriteOff32(MermaidWriter &mw, uint off) {
uint8 *p = mw.off32_cur;
if (off >= 0xC00000) {
uint t = (off & 0x3FFFFF) | 0xC00000;
p[0] = t;
p[1] = t >> 8;
p[2] = t >> 16;
p[3] = (off - t) >> 22;
p += 4;
} else {
p[0] = off;
p[1] = off >> 8;
p[2] = off >> 16;
p += 3;
}
mw.off32_cur = p;
mw.off32_count++;
}
static inline void Mermaid_WriteComplexOffs(MermaidWriter &mw, uint ml, uint lrl, uint offs, ptrdiff_t last_offs, const uint8 *lit_ptr) {
const uint8 *lit_end = lit_ptr + lrl;
if (mw.litsub_cur)
SubtractBytesUnsafe(postadd(mw.litsub_cur, lrl), lit_ptr, lrl, last_offs);
CopyBytesUnsafe(postadd(mw.lit_cur, lrl), lit_ptr, lrl);
if (lrl < 64) {
while (lrl > 7) {
*mw.token_cur++ = 0x87;
lrl -= 7;
}
} else {
Mermaid_WriteLenValue(mw, lrl - 64);
*mw.token_cur++ = 0x00;
mw.complex_token_count++;
lrl = 0;
if (ml == 0)
return;
}
if (offs <= 0xffff && ml < 91) {
uint ml_cur = std::min(ml, 15u);
uint8 token = lrl + 8 * ml_cur;
if (offs == 0) {
token += 0x80;
} else {
*mw.off16_cur++ = offs;
}
ml -= ml_cur;
*mw.token_cur++ = token;
while (ml) {
uint ml_cur = std::min(ml, 15u);
*mw.token_cur++ = 0x80 + 8 * ml_cur;
ml -= ml_cur;
}
} else {
mw.complex_token_count++;
if (lrl)
*mw.token_cur++ = 0x80 + lrl;
if (offs == 0)
offs = -(int)last_offs;
uint8 tok;
int lenval;
if (offs > 0xffff) {
if (ml - 5 <= 23) {
tok = ml - 5;
lenval = -1;
} else {
tok = 2;
lenval = ml - 29;
}
} else {
tok = 1;
lenval = ml - 91;
}
*mw.token_cur++ = tok;
if (lenval >= 0)
Mermaid_WriteLenValue(mw, lenval);
if (offs > 0xffff) {
Mermaid_WriteOff32(mw, offs + mw.src_ptr + mw.cur_block_start_2 - lit_end);
} else {
*mw.off16_cur++ = offs;
}
}
}
static inline void Mermaid_WriteOffs(MermaidWriter &mw, int ml, int lrl, int offs, ptrdiff_t last_offs, const uint8 *lit_start) {
if (lrl <= 7 && ml <= 15 && offs <= 0xffff) {
*(uint64*)mw.lit_cur = *(uint64*)lit_start;
mw.lit_cur += lrl;
if (mw.litsub_cur) {
_mm_storel_epi64((__m128i *)mw.litsub_cur,
_mm_sub_epi8(_mm_loadl_epi64((const __m128i *)lit_start),
_mm_loadl_epi64((const __m128i *)&lit_start[last_offs])));
mw.litsub_cur += lrl;
}
*mw.token_cur++ = ((offs == 0) << 7) + lrl + 8 * ml;
if (offs != 0)
*mw.off16_cur++ = offs;
} else {
Mermaid_WriteComplexOffs(mw, ml, lrl, offs, last_offs, lit_start);
}
}
static inline int MermaidMod7(int v) {
return (v > 7) ? (v - 1) % 7 + 1 : v;
}
static void Mermaid_WriteOffsWithLit1Inner(MermaidWriter &mw, int ml, int lrl, int offs, ptrdiff_t last_offs, const uint8 *lit_start) {
int i = 1, last = 0;
int found[33];
size_t found_ctr = 0;
while (i < lrl) {
int mask = _mm_movemask_epi8(_mm_cmpeq_epi8(_mm_loadu_si128((const __m128i *)&lit_start[i]), _mm_loadu_si128((const __m128i *)&lit_start[i + last_offs])));
if (!mask) {
i += 16;
} else {
int j = i + BSF(mask);
if (j >= lrl)
break;
i = j + 1;
if (j - last != 0) {
found[found_ctr++] = j - last;
last = i;
}
}
}
if (found_ctr != 0) {
found[found_ctr] = lrl - last;
for (size_t i = 0; i < found_ctr; i++) {
int cur = found[i];
if (MermaidMod7(cur) + MermaidMod7(found[i + 1]) + 1 > 7) {
Mermaid_WriteOffs(mw, 1, cur, 0, last_offs, lit_start);
lit_start += cur + 1;
lrl -= cur + 1;
} else {
found[i + 1] += cur + 1;
}
}
}
Mermaid_WriteOffs(mw, ml, lrl, offs, last_offs, lit_start);
}
static inline void Mermaid_WriteOffsWithLit1(MermaidWriter &mw, int ml, int lrl, int offs, ptrdiff_t last_offs, const uint8 *lit_start) {
if ((uint)(lrl - 8) > 55) {
Mermaid_WriteOffs(mw, ml, lrl, offs, last_offs, lit_start);
} else {
Mermaid_WriteOffsWithLit1Inner(mw, ml, lrl, offs, last_offs, lit_start);
}
}
int GetScratchUsage(int coder, int chunk_len) {
int result = 2 * chunk_len + 32;
if (coder != 9 && coder != 11)
result += chunk_len;
return std::min(result + 0xD000, 0x6C000);
}
struct MermaidHistos {
HistoU8 lit, tok;
HistoU8 off16lo, off16hi;
};
static float GetTime_MermaidOff16(int platforms, int num) {
return CombineCostComponents1A(platforms, num, 0.270f, 0.428f, 0.550f, 0.213f,
24.0f, 53.0f, 62.0f, 33.0f);
}
static float GetTime_Mermaid(int platforms, int len, int toks, int ctoks) {
return CombineCostComponents(platforms,
200.0f + len * 0.363f + toks * 5.393f + ctoks * 29.655f,
200.0f + len * 0.429f + toks * 6.977f + ctoks * 49.739f,
200.0f + len * 0.538f + toks * 8.676f + ctoks * 69.864f,
200.0f + len * 0.255f + toks * 5.364f + ctoks * 30.818f);
}
static float GetTime_Selkie(int platforms, int len, int toks, int ctoks, int lit) {
return CombineCostComponents(platforms,
200.0f + len * 0.371f + toks * 5.259f + ctoks * 25.474f + lit * 0.131f,
200.0f + len * 0.414f + toks * 6.678f + ctoks * 62.007f + lit * 0.065f,
200.0f + len * 0.562f + toks * 8.190f + ctoks * 75.523f + lit * 0.008f,
200.0f + len * 0.272f + toks * 5.018f + ctoks * 29.297f + lit * 0.070f);
}
static float GetTime_MermaidSelkieOff32(int platforms, int num) {
return CombineCostComponents1A(platforms, num, 1.285f, 3.369f, 2.446f, 1.032f,
56.010f, 33.347f, 133.394f, 67.640f);
}
int Mermaid_WriteLzTable(float *cost_ptr, int *chunk_type_ptr, MermaidHistos *mh, uint8 *dst, uint8 *dst_end, LzCoder *coder, LzTemp *lztemp, MermaidWriter *mw, int start_pos) {
bool is_mermaid = coder->codec_id == kCompressorMermaid;
const uint8 *src = mw->src_ptr;
int src_len = mw->src_len;
int token_count = mw->token_cur - mw->token_start;
uint8 *dst_org = dst;
if (token_count == 0 && (!is_mermaid || mw->litsub_start == NULL))
return src_len;
int eopts = coder->entropy_opts;
int level = coder->compression_level;
int platforms = coder->platforms;
float speed_tradeoff = coder->speed_tradeoff;
int initial_bytes = 0;
if (start_pos == 0) {
*(uint64*)dst = *(uint64*)src;
dst += 8;
initial_bytes = 8;
}
int lit_count = mw->lit_cur - mw->lit_start;
int litsub_count = mw->litsub_cur - mw->litsub_start;
HistoU8 litsub_histo;
HistoU8 lit_histo;
float lit_cost = kInvalidCost;
float raw_lit_cost = lit_count + 3;
if (lit_count == 0 && litsub_count > 0) {
*chunk_type_ptr = 0;
CountBytesHistoU8(mw->litsub_start, litsub_count, &litsub_histo);
int n_lits = EncodeArrayU8WithHisto(dst, dst_end, mw->litsub_start, litsub_count, litsub_histo, eopts, speed_tradeoff, platforms, &lit_cost, level);
if (n_lits < 0 || n_lits > litsub_count)
return src_len;
if (mh)
mh->lit = litsub_histo;
dst += n_lits;
} else if (is_mermaid && lit_count >= 32) {
CountBytesHistoU8(mw->lit_start, lit_count, &lit_histo);
int n, n_lits = -1;
if (mw->litsub_start) {
CountBytesHistoU8(mw->litsub_start, lit_count, &litsub_histo);
float litsub_cost = CombineCostComponents1(platforms, lit_count, 0.324f, 0.433f, 0.550f, 0.289f) * speed_tradeoff;
if (level >= 6 || GetHistoCostApprox(lit_histo, lit_count) * 0.125f > GetHistoCostApprox(litsub_histo, lit_count) * 0.125f + litsub_cost) {
*chunk_type_ptr = 0;
n_lits = EncodeArrayU8WithHisto(dst, dst_end, mw->litsub_start, lit_count, litsub_histo, eopts, speed_tradeoff, platforms, &lit_cost, level);
lit_cost += litsub_cost;
if (n_lits < 0 || n_lits >= lit_count || lit_cost > raw_lit_cost) {
lit_cost = kInvalidCost;
n_lits = -1;
}
}
}
if (n_lits < 0 || level >= 6) {
n = EncodeArrayU8WithHisto(dst, dst_end, mw->lit_start, lit_count, lit_histo, eopts, speed_tradeoff, platforms, &lit_cost, level);
if (n > 0) {
n_lits = n;
*chunk_type_ptr = 1;
} else if (n_lits < 0) {
return src_len;
}
}
if (mh)
mh->lit = (*chunk_type_ptr == 1) ? lit_histo : litsub_histo;
dst += n_lits;
} else {
int n_lits = lit_count + 3;
lit_cost = raw_lit_cost;
*chunk_type_ptr = 1;
if (is_mermaid) {
EncodeArrayU8_Memcpy(dst, dst_end, mw->lit_start, lit_count);
} else {
// selkie always writes lits directly to the stream
dst[0] = lit_count >> 16;
dst[1] = lit_count >> 8;
dst[2] = lit_count;
}
dst += n_lits;
}
// Encode tokens
float tok_cost = kInvalidCost;
int n_token;
if (is_mermaid) {
n_token = EncodeArrayU8(dst, dst_end, mw->token_start, token_count, eopts, speed_tradeoff, platforms, &tok_cost, level, mh ? &mh->tok : NULL);
} else {
tok_cost = token_count + 3;
n_token = EncodeArrayU8_Memcpy(dst, dst_end, mw->token_start, token_count);
}
if (n_token < 0)
return src_len;
dst += n_token;
uint8 *dst_after_tokens = dst;
if (dst_end - dst <= 16)
return src_len;
if (src_len > 0x10000)
*(uint16*)postadd(dst,2) = mw->tok_stream_2_offs;
int off16_count = mw->off16_cur - mw->off16_start;
float off16_cost = off16_count * 2;
uint off16_bytes;
if (is_mermaid && off16_count >= 32) {
// reuse the space used for lits
uint8 *lo_off16 = mw->lit_start;
uint8 *hi_off16 = lo_off16 + off16_count;
for (int i = 0; i < off16_count; i++) {
uint v = mw->off16_start[i];
lo_off16[i] = (uint8)v;
hi_off16[i] = (uint8)(v >> 8);
}
uint8 *off16_dst = (uint8 *)(mw->lit_start + 2 * off16_count);
float cost_off16_lo = kInvalidCost;
float cost_off16_hi = kInvalidCost;
int n_hi = EncodeArrayU8(off16_dst, (uint8*)mw->off16_start, hi_off16, off16_count, eopts, speed_tradeoff, platforms, &cost_off16_hi, level, mh ? &mh->off16hi : NULL);
int n_lo = EncodeArrayU8(off16_dst + n_hi, (uint8*)mw->off16_start, lo_off16, off16_count, eopts, speed_tradeoff, platforms, &cost_off16_lo, level, mh ? &mh->off16lo : NULL);
off16_bytes = n_hi + n_lo;
float cost = cost_off16_lo + cost_off16_hi + GetTime_MermaidOff16(platforms, off16_count) * speed_tradeoff;
if (cost >= off16_cost)
goto encode_off16_memcpy;
if (off16_bytes + 2 >= dst_end - dst)
return src_len;
off16_cost = cost;
*(uint16*)postadd(dst,2) = 0xffff;
memcpy(postadd(dst, off16_bytes), off16_dst, off16_bytes);
} else {
encode_off16_memcpy:
off16_bytes = (uintptr_t)mw->off16_cur - (uintptr_t)mw->off16_start;
if (off16_bytes + 2 >= dst_end - dst)
return src_len;
*(uint16*)postadd(dst,2) = off16_count;
memcpy(postadd(dst, off16_bytes), mw->off16_start, off16_bytes);
}
int off32_count = mw->off32_count_1 + mw->off32_count_2;
int required_scratch = token_count + lit_count + 4 * (off32_count + off16_count) + 0xd000 + 0x40 + 4;
if (required_scratch > GetScratchUsage(coder->codec_id, src_len)) {
assert(0);
return src_len;
}
if (dst_end - dst <= 7)
return src_len;
uint v = (std::min(mw->off32_count_1, 4095) << 12) + std::min(mw->off32_count_2, 4095);
*(uint32*)postadd(dst, 3) = v;
if (mw->off32_count_1 >= 4095)
*(uint16*)postadd(dst, 2) = mw->off32_count_1;
if (mw->off32_count_2 >= 4095)
*(uint16*)postadd(dst, 2) = mw->off32_count_2;
uint off32_byte_count = mw->off32_cur - mw->off32_start;
if (off32_byte_count >= dst_end - dst)
return src_len;
memcpy(postadd(dst, off32_byte_count), mw->off32_start, off32_byte_count);
uint len_count = mw->length_cur - mw->length_start;
if (len_count >= dst_end - dst)
return src_len;
memcpy(postadd(dst, len_count), mw->length_start, len_count);
if (dst - dst_org >= src_len)
return src_len;
float time = (is_mermaid) ? GetTime_Mermaid(platforms, src_len, token_count, mw->complex_token_count) :
GetTime_Selkie(platforms, src_len, token_count, mw->complex_token_count, lit_count);
float off32_time = GetTime_MermaidSelkieOff32(platforms, off32_count) * speed_tradeoff;
int extra = dst - dst_after_tokens - off16_bytes;
*cost_ptr = off32_time + (tok_cost + lit_cost + time * speed_tradeoff + extra + off16_cost + initial_bytes);
return dst - dst_org;
}
static __forceinline bool MermaidIsBetterThanRecent(int rml, int ml, int offs) {
return rml < 2 || (rml + 1 < ml && (rml + 4 < ml || offs < 65536));
}
static __forceinline bool MermaidIsMatchBetter(int ml, int offs, int best_ml, int best_offs) {
if (ml == best_ml)
return offs < best_offs;
if ((offs <= 0xffff) == (best_offs <= 0xffff))
return ml > best_ml;
if (best_offs <= 0xffff)
return ml > best_ml + 5;
return ml >= best_ml - 5;
}
template<typename Hasher>
__forceinline LengthAndOffset MermaidFast_GetMatch(const uint8 *src_cur, const uint8 *src_end_safe, const uint8 *lit_start,
ptrdiff_t last_offs, Hasher *hasher,
const uint8 *next_cur_ptr, int dict_size, int min_match_length, const uint minlen[32]) {
typename Hasher::HashPos hp = hasher->GetHashPos(src_cur);
uint32 u32_at_src = *(uint32*)src_cur;
hasher->SetHashPosPrefetch(next_cur_ptr);
uint32 xorval = *(uint32*)&src_cur[last_offs] ^ u32_at_src;
if (xorval == 0) {
LengthAndOffset match = { 4 + CountMatchingBytes(src_cur + 4, src_end_safe, -last_offs), 0 };
hasher->Insert(hp);
return match;
}
uint32 recent_ml = BSF(xorval) >> 3;
if (src_cur - lit_start >= 64) {
if (recent_ml < 3)
recent_ml = 0;
min_match_length += 1;
}
uint32 best_offs = 0;
uint32 best_ml = min_match_length - 1;
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)) {
uint32 cur_offs = (hp.pos - cur_hash_ptr[hashidx]) & 0x3ffffff;
if (cur_offs > 8 && cur_offs < dict_size && *(uint32*)(src_cur - cur_offs) == u32_at_src) {
uint32 cur_ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, cur_offs);
if (cur_ml > best_ml && cur_ml >= minlen[31 - BSR(cur_offs)] &&
MermaidIsMatchBetter(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;
}
if (*(uint32*)(src_cur - 8) == u32_at_src) {
uint32 cur_ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, 8);
if (cur_ml >= best_ml && cur_ml >= min_match_length)
best_ml = cur_ml, best_offs = 8;
}
hasher->Insert(hp);
if (best_offs == 0 || !MermaidIsBetterThanRecent(recent_ml, best_ml, best_offs))
best_ml = recent_ml, best_offs = 0;
LengthAndOffset match = { (int)best_ml, (int)best_offs };
return match;
}
template<>
__forceinline LengthAndOffset MermaidFast_GetMatch(const uint8 *src_cur, const uint8 *src_end_safe, const uint8 *lit_start,
ptrdiff_t last_offs, MatchHasher2 *hasher,
const uint8 *next_cur_ptr, int dict_size, int min_match_length, const uint minlen[32]) {
MatchHasher2::HashPos hp = hasher->GetHashPos(src_cur);
uint32 u32_at_src = *(uint32*)src_cur;
hasher->SetHashPosPrefetch(next_cur_ptr);
uint32 xorval = *(uint32*)&src_cur[last_offs] ^ u32_at_src;
if (xorval == 0) {
LengthAndOffset match = { 4 + CountMatchingBytes(src_cur + 4, src_end_safe, -last_offs), 0 };
hasher->Insert(hp);
return match;
}
uint32 recent_ml = BSF(xorval) >> 3;
if (src_cur - lit_start >= 64) {
if (recent_ml < 3)
recent_ml = 0;
min_match_length += 1;
}
// Look in the short table
uint32 best_ml = 0, best_offs = 0;
uint32 hashval = hasher->firsthash_[hp.hash_a];
uint32 offs = hp.pos - hashval;
if (offs <= 0xffff) {
if (offs) {
int max_loops = 8;
while (offs < dict_size) {
if (offs > 8) {
if (*(uint32*)(src_cur - offs) == u32_at_src && (best_ml < 4 || (src_cur + best_ml < src_end_safe && *(src_cur + best_ml) == *(src_cur - offs + best_ml)) )) {
uint32 ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, offs);
if (ml > best_ml && ml >= min_match_length)
best_ml = ml, best_offs = offs;
}
if (!--max_loops)
break;
}
uint32 offs_old = offs;
hashval = hasher->nexthash_[(uint16)hashval];
offs = (uint16)(hp.pos - hashval);
if (offs <= offs_old)
break;
}
}
} else if (offs < dict_size && *(uint32*)(src_cur - offs) == u32_at_src) {
uint32 ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, offs);
if (ml > min_match_length && ml >= minlen[31 - BSR(offs)])
best_ml = ml, best_offs = offs;
}
// Look in the long table
hashval = hasher->longhash_[hp.hash_b];
if (((hp.hash_b_hi ^ hashval) & 0x3F) == 0) {
offs = hp.pos - (hashval >> 6);
if (offs >= 8 && offs < dict_size && *(uint32*)(src_cur - offs) == u32_at_src) {
uint32 ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, offs);
if (ml >= minlen[31 - BSR(offs)] && MermaidIsMatchBetter(ml, offs, best_ml, best_offs))
best_ml = ml, best_offs = offs;
}
}
// Look at offs -8
if (*(uint32*)(src_cur - 8) == u32_at_src) {
uint32 ml = 4 + CountMatchingBytes(src_cur + 4, src_end_safe, 8);
if (ml >= best_ml && ml >= min_match_length)
best_ml = ml, best_offs = 8;
}
hasher->Insert(hp);
if (!MermaidIsBetterThanRecent(recent_ml, best_ml, best_offs))
best_ml = recent_ml, best_offs = 0;
LengthAndOffset match = { (int)best_ml, (int)best_offs };
return match;
}
static inline bool MermaidIsLazyBetter(LengthAndOffset a, LengthAndOffset b, int step) {
int bits_a = (a.offset > 0) ? (a.offset > 0xffff ? 32 : 16) : 0;
int bits_b = (b.offset > 0) ? (b.offset > 0xffff ? 32 : 16) : 0;
return 5 * (a.length - b.length) - 5 - (bits_a - bits_b) > step * 4;
}
template<int _Level, typename _Hasher>
struct MermaidCompressFast {
typedef _Hasher Hasher;
enum { Level = _Level };
static __forceinline void Run(MermaidWriter &mw, Hasher *hasher, const uint8 *src_cur, const uint8 *src_end_safe, const uint8 *src_end, ptrdiff_t &last_offs, uint dict_size, const uint min_match_length_table[32], int min_match_length) {
const uint8 *lit_start = src_cur;
if (src_cur < src_end_safe - 5) {
hasher->SetHashPos(src_cur);
while (src_cur < src_end_safe - 5 - 1) {
LengthAndOffset m = MermaidFast_GetMatch<Hasher>(src_cur, src_end_safe, lit_start, last_offs, hasher, src_cur + 1, dict_size, min_match_length, min_match_length_table);
if (m.length < 2) {
src_cur++;
continue;
}
while (src_cur + 1 < src_end_safe - 5) {
LengthAndOffset m1 = MermaidFast_GetMatch<Hasher>(src_cur + 1, src_end_safe, lit_start, last_offs, hasher, src_cur + 2, dict_size, min_match_length, min_match_length_table);
if (m1.length >= 2 && MermaidIsLazyBetter(m1, m, 0)) {
src_cur += 1; // lazy1 is better
m = m1;
} else {
if (Level <= 3 || src_cur + 2 > src_end_safe - 5 || m.length == 2)
break;
LengthAndOffset m2 = MermaidFast_GetMatch<Hasher>(src_cur + 2, src_end_safe, lit_start, last_offs, hasher, src_cur + 3, dict_size, min_match_length, min_match_length_table);
if (m2.length >= 2 && MermaidIsLazyBetter(m2, m, 1)) {
src_cur += 2; // lazy2 is better
m = m2;
} else {
break;
}
}
}
ptrdiff_t actual_offs = (m.offset == 0) ? -last_offs : m.offset;
// Reduce literal length and increase match length for bytes preceding the match.
while (src_cur > lit_start && src_cur - hasher->src_base_ > actual_offs && src_cur[-1] == src_cur[-actual_offs - 1])
src_cur--, m.length++;
Mermaid_WriteOffsWithLit1(mw, m.length, src_cur - lit_start, m.offset, last_offs, lit_start);
last_offs = -actual_offs;
src_cur += m.length;
lit_start = src_cur;
if (src_cur >= src_end_safe - 5)
break;
hasher->InsertRange(src_cur - m.length, m.length);
}
}
ptrdiff_t remains = src_end - lit_start;
if (remains > 0) {
memcpy(postadd(mw.lit_cur, remains), lit_start, remains);
if (mw.litsub_cur)
SubtractBytes(postadd(mw.litsub_cur, remains), lit_start, remains, last_offs);
}
}
};
template<int _Level, typename _Hasher>
struct MermaidCompressVeryfast {
typedef _Hasher Hasher;
enum { Level = _Level };
static __forceinline void Run(MermaidWriter &mw, Hasher *hasher, const uint8 *src_cur, const uint8 *src_end_safe, const uint8 *src_end, ptrdiff_t &last_offs, uint dict_size, const uint min_match_length_table[32], int min_match_length) {
const uint8 *match_end;
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_;
int offs_or_recent;
enum {
SkipFactor = (Level <= -3) ? 3 : (Level <= 1) ? 4 : 5,
};
int skip = 1 << SkipFactor;
ptrdiff_t cur_offs;
const uint8 *lit_start = src_cur;
if (src_cur < src_end_safe - 5) {
for (;;) {
uint32 u32_at_cur = *(uint32*)src_cur;
hash = &hash_ptr[(size_t)(*(uint64*)src_cur * hashmult >> hashshift)];
uint32 hashval = *hash;
*hash = src_cur - src_base;
uint32 xor_val = u32_at_cur ^ *(uint32*)(src_cur + last_offs);
if ((xor_val & 0xffffff00) == 0) {
// 1 byte literal and at least 3 recent match
src_cur += 1;
offs_or_recent = 0;
hash_ptr[(size_t)(*(uint64*)src_cur * hashmult >> hashshift)] = src_cur - src_base;
cur_offs = last_offs;
match_end = MermaidMatchLength(src_cur + 3, src_end_safe, cur_offs);
} 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)) {
match_end = MermaidMatchLength(src_cur + 4, src_end_safe, -offs_or_recent);
if (match_end - src_cur < min_match_length_table[31 - BSR(offs_or_recent)])
goto no_match;
cur_offs = -offs_or_recent;
} else if (u32_at_cur == *(uint32*)(src_cur - 8)) {
offs_or_recent = 8;
cur_offs = -8;
match_end = MermaidMatchLength(src_cur + 4, src_end_safe, cur_offs);
} else {
no_match:
if (Level >= 2 && (xor_val & 0xffff) == 0) {
// check for 2/3 byte recent0 match
offs_or_recent = 0;
cur_offs = last_offs;
match_end = src_cur + ((xor_val & 0xffffff) == 0 ? 3 : 2);
} else {
if (src_end_safe - 5 - src_cur <= (skip >> SkipFactor))
break;
const uint8 *src_cur_next = src_cur + (skip >> SkipFactor);
if (Level >= -2)
skip++;
else
skip = std::min<int>(skip + ((src_cur - lit_start) >> 1), 296);
src_cur = src_cur_next;
continue;
}
}
}
// Reduce literal length and increase match length for bytes preceding the match.
while (src_cur > lit_start && (src_base - src_cur) < cur_offs &&
src_cur[-1] == src_cur[cur_offs - 1])
src_cur--;
int ml = match_end - src_cur;
Mermaid_WriteOffs(mw, ml,
src_cur - lit_start, offs_or_recent, last_offs, lit_start);
lit_start = src_cur = match_end;
skip = 1 << SkipFactor;
last_offs = cur_offs;
if (src_cur >= src_end_safe - 5)
break;
if (Level >= 2) {
const uint8 *matchstart = src_cur - ml;
for (int i = 1; i < ml; i *= 2)
hash_ptr[(size_t)(*(uint64*)(i + matchstart) * hashmult >> hashshift)] = i + matchstart - src_base;
}
}
}
ptrdiff_t remains = src_end - lit_start;
if (remains > 0) {
memcpy(postadd(mw.lit_cur, remains), lit_start, remains);
if (mw.litsub_cur)
SubtractBytes(postadd(mw.litsub_cur, remains), lit_start, remains, last_offs);
}
}
};
static void MermaidBuildMatchLengths(uint *tab, int min_matchlen, int v) {
tab[0] = tab[1] = tab[2] = tab[3] = tab[4] = tab[5] = tab[6] = tab[7] = tab[8] = tab[9] = 32;
tab[10] = tab[11] = v * 2 - 6;
tab[12] = tab[13] = tab[14] = tab[15] = v;
tab[16] = tab[17] = tab[18] = tab[19] = tab[20] = tab[21] = tab[22] = tab[23] = min_matchlen;
tab[24] = tab[25] = tab[26] = tab[27] = tab[28] = tab[29] = tab[30] = tab[31] = min_matchlen;
}
template<typename Function>
static int MermaidCompressLoop(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) {
*chunk_type_ptr = -1;
*cost_ptr = kInvalidCost;
if (src_size <= 128)
return src_size;
bool is_mermaid = coder->codec_id == kCompressorMermaid;
uint dict_size = coder->opts->dictionarySize > 0 && coder->opts->dictionarySize <= 0x40000000 ?
coder->opts->dictionarySize : 0x40000000;
int min_match_length = std::max(coder->opts->min_match_length, 4);
MermaidWriter mw;
MermaidWriter_Init(&mw, src_size, src, is_mermaid && (Function::Level >= 0));
uint min_match_length_table[32];
MermaidBuildMatchLengths(min_match_length_table, min_match_length, is_mermaid ? 10 : 14);
int initial_copy_bytes = (start_pos == 0) ? 8 : 0;
// Selkie writes lits directly into the buffer
if (!is_mermaid)
mw.lit_start = mw.lit_cur = dst + 3 + initial_copy_bytes;
ptrdiff_t last_offs = -8;
typename Function::Hasher *hasher = (typename Function::Hasher*)coder->hasher;
for (int iteration = 0; iteration < 2; iteration++) {
const uint8 *src_cur, *block_end;
if (iteration == 0) {
src_cur = src + initial_copy_bytes;
block_end = src + mw.block1_size;
mw.cur_block_start_2 = 0;
} else {
mw.tok_stream_2_offs = mw.token_cur - mw.token_start;
if (!mw.block2_size)
break;
src_cur = src + mw.block1_size;
block_end = src_cur + mw.block2_size;
mw.cur_block_start_2 = mw.block1_size;
}
mw.off32_count = 0;
Function::Run(mw, hasher, src_cur, std::min(block_end, src + src_size - 16), block_end, last_offs, dict_size, min_match_length_table, min_match_length);
if (iteration == 0)
mw.off32_count_1 = mw.off32_count;
else
mw.off32_count_2 = mw.off32_count;
}
return Mermaid_WriteLzTable(cost_ptr, chunk_type_ptr, 0, dst, dst_end, coder, lztemp, &mw, start_pos);
}
static LengthAndOffset Mermaid_GetLzMatch(const LengthAndOffset *lao, int recent0,
const uint8 *src_cur, const uint8 *src_end,
int lrl, int min_match_len,
const uint *min_match_lens, const uint8 *window_base, uint dict_size) {
int min_match_len_recent = 2;
if (lrl >= 64) {
min_match_len_recent = min_match_len - 1;
min_match_len += min_match_len >> 1;
}
uint32 u32_at_cur = *(uint32*)src_cur;
int recent_ml = GetMatchlengthQ(src_cur, recent0, src_end, u32_at_cur);
if (recent_ml >= min_match_len_recent) {
if (recent_ml >= 4) {
LengthAndOffset m = {recent_ml, 0};
return m;
}
} else {
recent_ml = 0;
}
int best_ml = 0;
int best_offs = 0;
for (size_t midx = 0; midx != 4; midx++) {
int ml = lao[midx].length;
if (ml < min_match_len)
break;
if (ml > src_end - src_cur) {
ml = src_end - src_cur;
if (ml < min_match_len)
break;
}
uint offs = lao[midx].offset;
if (offs >= dict_size)
continue;
if (offs < 8) {
// Expand the offset to at least 8 bytes long
uint tt = offs;
do offs += tt; while (offs < 8);
if (offs > src_cur - window_base)
continue;
ml = GetMatchlengthQMin4(src_cur, offs, src_end, u32_at_cur);
if (ml < min_match_len)
continue;
}
if (ml >= min_match_lens[31 - BSR(offs)] && MermaidIsMatchBetter(ml, offs, best_ml, best_offs))
best_ml = ml, best_offs = offs;
}
if (!MermaidIsBetterThanRecent(recent_ml, best_ml, best_offs))
best_ml = recent_ml, best_offs = 0;
LengthAndOffset match = { (int)best_ml, (int)best_offs };
return match;
}
static int MermaidCollectStats(float *cost_ptr, int *chunk_type_ptr, MermaidHistos *histos,
uint8 *dst, uint8 *dst_end,
LzCoder *coder, LzTemp *lztemp,
const uint8 *src, int src_len, int start_pos, int initial_copy_bytes,
LengthAndOffset *lao, int min_match_len, int minmatch_param,
const uint8 *window_base, uint dict_size) {
bool is_mermaid = coder->codec_id == kCompressorMermaid;
uint min_match_lens[32];
MermaidBuildMatchLengths(min_match_lens, min_match_len, minmatch_param);
MermaidWriter mw;
MermaidWriter_Init(&mw, src_len, src, true);
if (!is_mermaid)
mw.lit_start = mw.lit_cur = dst + 3 + initial_copy_bytes;
int recent0 = 8;
for (int iteration = 0; iteration < 2; iteration++) {
int pos, pos_end;
if (iteration == 0) {
pos = initial_copy_bytes;
pos_end = mw.block1_size;
mw.cur_block_start_2 = 0;
} else {
mw.tok_stream_2_offs = mw.token_cur - mw.token_start;
if (!mw.block2_size)
break;
pos = mw.block1_size;
pos_end = pos + mw.block2_size;
mw.cur_block_start_2 = mw.block1_size;
}
mw.off32_count = 0;
const uint8 *src_end = src + std::min(src_len - 16, pos_end);
int bytes_minus5 = src_end - src - 5;
int lit_start = pos;
while (pos < bytes_minus5) {
LengthAndOffset m = Mermaid_GetLzMatch(&lao[4 * pos], recent0, src + pos, src_end, pos - lit_start, min_match_len, min_match_lens, window_base, dict_size);
if (!m.length) {
pos++;
continue;
}
while (pos + 1 < bytes_minus5) {
LengthAndOffset m1 = Mermaid_GetLzMatch(&lao[4 * (pos + 1)], recent0, src + pos + 1, src_end, pos + 1 - lit_start, min_match_len, min_match_lens, window_base, dict_size);
if (m1.length >= 2 && MermaidIsLazyBetter(m1, m, 0)) {
pos += 1; // lazy1 is better
m = m1;
} else {
if (pos + 2 >= bytes_minus5)
break;
LengthAndOffset m2 = Mermaid_GetLzMatch(&lao[4 * (pos + 2)], recent0, src + pos + 2, src_end, pos + 2 - lit_start, min_match_len, min_match_lens, window_base, dict_size);
if (m2.length >= 2 && MermaidIsLazyBetter(m2, m, 1)) {
pos += 2; // lazy2 is better
m = m2;
} else {
break;
}
}
}
int actual_offs = (m.offset == 0) ? recent0 : m.offset;
int lrl = pos - lit_start;
if (m.length == 16 || m.length == 31) {
m.length--;
if (m.offset <= 0xffff && MermaidMod7(lrl) < 7)
pos++, lrl++;
}
Mermaid_WriteOffsWithLit1(mw, m.length, lrl, m.offset, -recent0, src + lit_start);
pos += m.length;
recent0 = actual_offs;
lit_start = pos;
}
size_t remains = pos_end - lit_start;
if (remains > 0) {
memcpy(postadd(mw.lit_cur, remains), src + lit_start, remains);
if (mw.litsub_cur)
SubtractBytes(postadd(mw.litsub_cur, remains), src + lit_start, remains, -recent0);
}
if (iteration == 0)
mw.off32_count_1 = mw.off32_count;
else
mw.off32_count_2 = mw.off32_count;
}
int opts_org = coder->entropy_opts;
int level_org = coder->compression_level;
coder->entropy_opts &= ~kEntropyOpt_MultiArray;
coder->compression_level = 4;
int n = Mermaid_WriteLzTable(cost_ptr, chunk_type_ptr, histos, dst, dst_end, coder, lztemp, &mw, start_pos);
coder->compression_level = level_org;
coder->entropy_opts = opts_org;