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tbcore.c
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tbcore.c
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/*
Copyright (c) 2011-2013 Ronald de Man
This file may be redistributed and/or modified without restrictions.
tbcore.c contains engine-independent routines of the tablebase probing code.
This file should not need to much adaptation to add tablebase probing to
a particular engine, provided the engine is written in C or C++.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "tbcore.h"
#define TBMAX_PIECE 254
#define TBMAX_PAWN 256
#define HSHMAX 5
#define Swap(a,b) {int tmp=a;a=b;b=tmp;}
#define TB_PAWN 1
#define TB_KNIGHT 2
#define TB_BISHOP 3
#define TB_ROOK 4
#define TB_QUEEN 5
#define TB_KING 6
#define TB_WPAWN TB_PAWN
#define TB_BPAWN (TB_PAWN | 8)
static LOCK_T TB_mutex;
static bool initialized = false;
static int num_paths = 0;
static char *path_string = NULL;
static char **paths = NULL;
static int TBnum_piece, TBnum_pawn;
static struct TBEntry_piece TB_piece[TBMAX_PIECE];
static struct TBEntry_pawn TB_pawn[TBMAX_PAWN];
static struct TBHashEntry TB_hash[1 << TBHASHBITS][HSHMAX];
#define DTZ_ENTRIES 64
static struct DTZTableEntry DTZ_table[DTZ_ENTRIES];
static void init_indices(void);
static uint64 calc_key_from_pcs(int *pcs, int mirror);
static void free_wdl_entry(struct TBEntry *entry);
static void free_dtz_entry(struct TBEntry *entry);
static void* lm(size_t s){// local malloc
return( malloc(s)); // if i allocate in chunks, i cannot deallocate it one piece at a time, so engine crashes.
/*#define lms (2*1024*1024) // in 2 Mb chunks.
static UINT64 cc=0;// pointer to next block
static char *p0;
if( cc+s>lms ) cc=0;// alloc more
if( cc==0 ) p0=(char*)malloc(lms);
void *p=(void*)(p0+cc);
cc+=s;
return(p);*/
}
static FD open_tb(const char *str, const char *suffix){
int i;
FD fd;
char file[256];
for (i = 0; i < num_paths; i++) {
strcpy(file, paths[i]);
strcat(file, "/");
strcat(file, str);
strcat(file, suffix);
fd = CreateFile(file, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (fd != FD_ERR) return fd;
}
return FD_ERR;
}
static void close_tb(FD fd){
CloseHandle(fd);
}
static char *map_file(const char *name, const char *suffix, uint64 *mapping){
FD fd = open_tb(name, suffix);
if (fd == FD_ERR)
return NULL;
DWORD size_low, size_high;
size_low = GetFileSize(fd, &size_high);
HANDLE map = CreateFileMapping(fd, NULL, PAGE_READONLY, size_high, size_low,
NULL);
if (map == NULL) {
#if ENGINE
pass_message_to_GUI("CreateFileMapping() failed.\n");
#endif
exit(1);
}
*mapping = (uint64)map;
char *data = (char *)MapViewOfFile(map, FILE_MAP_READ, 0, 0, 0);
if (data == NULL) {
#if ENGINE
char sss[150];
sprintf(sss,"MapViewOfFile() failed, name = %s%s, error = %lu.\n", name, suffix, GetLastError());
pass_message_to_GUI(sss);
#endif
exit(1);
}
close_tb(fd);
return data;
}
static void unmap_file(char *data, uint64 mapping){
if (!data) return;
UnmapViewOfFile(data);
CloseHandle((HANDLE)mapping);
}
static void add_to_hash(struct TBEntry *ptr, uint64 key){
int i, hshidx;
hshidx = key >> (64 - TBHASHBITS);
i = 0;
while (i < HSHMAX && TB_hash[hshidx][i].ptr)
i++;
if (i == HSHMAX) {
#if ENGINE
pass_message_to_GUI("HSHMAX too low!\n");
#endif
exit(1);
} else {
TB_hash[hshidx][i].key = key;
TB_hash[hshidx][i].ptr = ptr;
}
}
static char pchr[] = {'K', 'Q', 'R', 'B', 'N', 'P'};
unsigned int MaxCardinality;
static void init_tb(char *str){
FD fd;
struct TBEntry *entry;
int i, j, pcs[16];
uint64 key, key2;
int color;
char *s;
fd = open_tb(str, WDLSUFFIX);
if (fd == FD_ERR) return;
close_tb(fd);
for (i = 0; i < 16; i++)
pcs[i] = 0;
color = 0;
for (s = str; *s; s++)
switch (*s) {
case 'P':
pcs[TB_PAWN | color]++;
break;
case 'N':
pcs[TB_KNIGHT | color]++;
break;
case 'B':
pcs[TB_BISHOP | color]++;
break;
case 'R':
pcs[TB_ROOK | color]++;
break;
case 'Q':
pcs[TB_QUEEN | color]++;
break;
case 'K':
pcs[TB_KING | color]++;
break;
case 'v':
color = 0x08;
break;
}
for (i = 0; i < 8; i++)
if (pcs[i] != pcs[i+8])
break;
key = calc_key_from_pcs(pcs, 0);
key2 = calc_key_from_pcs(pcs, 1);
if (pcs[TB_WPAWN] + pcs[TB_BPAWN] == 0) {
if (TBnum_piece == TBMAX_PIECE) {
#if ENGINE
pass_message_to_GUI("TBMAX_PIECE limit too low!\n");
#endif
exit(1);
}
entry = (struct TBEntry *)&TB_piece[TBnum_piece++];
} else {
if (TBnum_pawn == TBMAX_PAWN) {
#if ENGINE
pass_message_to_GUI("TBMAX_PAWN limit too low!\n");
#endif
exit(1);
}
entry = (struct TBEntry *)&TB_pawn[TBnum_pawn++];
}
entry->key = key;
entry->ready = 0;
entry->num = 0;
for (i = 0; i < 16; i++)
entry->num += (ubyte)pcs[i];
entry->symmetric = (key == key2);
entry->has_pawns = (pcs[TB_WPAWN] + pcs[TB_BPAWN] > 0);
if (entry->num > MaxCardinality)
MaxCardinality = entry->num;
if (entry->has_pawns) {
struct TBEntry_pawn *ptr = (struct TBEntry_pawn *)entry;
ptr->pawns[0] = (ubyte)pcs[TB_WPAWN];
ptr->pawns[1] = (ubyte)pcs[TB_BPAWN];
if (pcs[TB_BPAWN] > 0
&& (pcs[TB_WPAWN] == 0 || pcs[TB_BPAWN] < pcs[TB_WPAWN])) {
ptr->pawns[0] = (ubyte)pcs[TB_BPAWN];
ptr->pawns[1] = (ubyte)pcs[TB_WPAWN];
}
} else {
struct TBEntry_piece *ptr = (struct TBEntry_piece *)entry;
for (i = 0, j = 0; i < 16; i++)
if (pcs[i] == 1) j++;
if (j >= 3) ptr->enc_type = 0;
else if (j == 2) ptr->enc_type = 2;
else { /* only for suicide */
j = 16;
for (i = 0; i < 16; i++) {
if (pcs[i] < j && pcs[i] > 1) j = pcs[i];
ptr->enc_type = ubyte(1 + j);
}
}
}
add_to_hash(entry, key);
if (key2 != key) add_to_hash(entry, key2);
}
unsigned int init_tablebases(char *p){
char str[16];
int i, j, k;
if (initialized) {
free(path_string);
free(paths);
struct TBEntry *entry;
for (i = 0; i < TBnum_piece; i++) {
entry = (struct TBEntry *)&TB_piece[i];
free_wdl_entry(entry);
}
for (i = 0; i < TBnum_pawn; i++) {
entry = (struct TBEntry *)&TB_pawn[i];
free_wdl_entry(entry);
}
for (i = 0; i < DTZ_ENTRIES; i++)
if (DTZ_table[i].entry)
free_dtz_entry(DTZ_table[i].entry);
} else {
init_indices();
initialized = true;
}
MaxCardinality=0;//reset
if (strlen(p) == 0 || !strcmp(p, "<empty>")) return 0;
path_string = (char *)lm(strlen(p) + 1);
strcpy(path_string, p);
num_paths = 0;
for (i = 0;; i++) {
if (path_string[i] != SEP_CHAR)
num_paths++;
while (path_string[i] && path_string[i] != SEP_CHAR)
i++;
if (!path_string[i]) break;
path_string[i] = 0;
}
paths = (char **)lm(num_paths * sizeof(char *));
for (i = j = 0; i < num_paths; i++) {
while (!path_string[j]) j++;
paths[i] = &path_string[j];
while (path_string[j]) j++;
}
LOCK_INIT(TB_mutex);
TBnum_piece = TBnum_pawn = 0;
MaxCardinality = 0;
for (i = 0; i < (1 << TBHASHBITS); i++)
for (j = 0; j < HSHMAX; j++) {
TB_hash[i][j].key = 0ULL;
TB_hash[i][j].ptr = NULL;
}
for (i = 0; i < DTZ_ENTRIES; i++)
DTZ_table[i].entry = NULL;
for (i = 1; i < 6; i++) {
sprintf(str, "K%cvK", pchr[i]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++) {
sprintf(str, "K%cvK%c", pchr[i], pchr[j]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++) {
sprintf(str, "K%c%cvK", pchr[i], pchr[j]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++)
for (k = 1; k < 6; k++) {
sprintf(str, "K%c%cvK%c", pchr[i], pchr[j], pchr[k]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++)
for (k = j; k < 6; k++) {
sprintf(str, "K%c%c%cvK", pchr[i], pchr[j], pchr[k]);
init_tb(str);
}
#if EGTBP==6
int l;
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++)
for (k = i; k < 6; k++)
for (l = (i == k) ? j : k; l < 6; l++) {
sprintf(str, "K%c%cvK%c%c", pchr[i], pchr[j], pchr[k], pchr[l]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++)
for (k = j; k < 6; k++)
for (l = 1; l < 6; l++) {
sprintf(str, "K%c%c%cvK%c", pchr[i], pchr[j], pchr[k], pchr[l]);
init_tb(str);
}
for (i = 1; i < 6; i++)
for (j = i; j < 6; j++)
for (k = j; k < 6; k++)
for (l = k; l < 6; l++) {
sprintf(str, "K%c%c%c%cvK", pchr[i], pchr[j], pchr[k], pchr[l]);
init_tb(str);
}
#endif
#if ENGINE
char sss[100];
sprintf(sss,"info string Found %d tablebases.\n", TBnum_piece + TBnum_pawn);
pass_message_to_GUI(sss);
#endif
return(TBnum_piece + TBnum_pawn);
}
static const signed char offdiag[] = {
0,-1,-1,-1,-1,-1,-1,-1,
1, 0,-1,-1,-1,-1,-1,-1,
1, 1, 0,-1,-1,-1,-1,-1,
1, 1, 1, 0,-1,-1,-1,-1,
1, 1, 1, 1, 0,-1,-1,-1,
1, 1, 1, 1, 1, 0,-1,-1,
1, 1, 1, 1, 1, 1, 0,-1,
1, 1, 1, 1, 1, 1, 1, 0
};
static const ubyte triangle[] = {
6, 0, 1, 2, 2, 1, 0, 6,
0, 7, 3, 4, 4, 3, 7, 0,
1, 3, 8, 5, 5, 8, 3, 1,
2, 4, 5, 9, 9, 5, 4, 2,
2, 4, 5, 9, 9, 5, 4, 2,
1, 3, 8, 5, 5, 8, 3, 1,
0, 7, 3, 4, 4, 3, 7, 0,
6, 0, 1, 2, 2, 1, 0, 6
};
static const ubyte invtriangle[] = {
1, 2, 3, 10, 11, 19, 0, 9, 18, 27
};
static const ubyte invdiag[] = {
0, 9, 18, 27, 36, 45, 54, 63,
7, 14, 21, 28, 35, 42, 49, 56
};
static const ubyte flipdiag[] = {
0, 8, 16, 24, 32, 40, 48, 56,
1, 9, 17, 25, 33, 41, 49, 57,
2, 10, 18, 26, 34, 42, 50, 58,
3, 11, 19, 27, 35, 43, 51, 59,
4, 12, 20, 28, 36, 44, 52, 60,
5, 13, 21, 29, 37, 45, 53, 61,
6, 14, 22, 30, 38, 46, 54, 62,
7, 15, 23, 31, 39, 47, 55, 63
};
static const ubyte lower[] = {
28, 0, 1, 2, 3, 4, 5, 6,
0, 29, 7, 8, 9, 10, 11, 12,
1, 7, 30, 13, 14, 15, 16, 17,
2, 8, 13, 31, 18, 19, 20, 21,
3, 9, 14, 18, 32, 22, 23, 24,
4, 10, 15, 19, 22, 33, 25, 26,
5, 11, 16, 20, 23, 25, 34, 27,
6, 12, 17, 21, 24, 26, 27, 35
};
static const ubyte diag[] = {
0, 0, 0, 0, 0, 0, 0, 8,
0, 1, 0, 0, 0, 0, 9, 0,
0, 0, 2, 0, 0, 10, 0, 0,
0, 0, 0, 3, 11, 0, 0, 0,
0, 0, 0, 12, 4, 0, 0, 0,
0, 0, 13, 0, 0, 5, 0, 0,
0, 14, 0, 0, 0, 0, 6, 0,
15, 0, 0, 0, 0, 0, 0, 7
};
static const ubyte flap[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 6, 12, 18, 18, 12, 6, 0,
1, 7, 13, 19, 19, 13, 7, 1,
2, 8, 14, 20, 20, 14, 8, 2,
3, 9, 15, 21, 21, 15, 9, 3,
4, 10, 16, 22, 22, 16, 10, 4,
5, 11, 17, 23, 23, 17, 11, 5,
0, 0, 0, 0, 0, 0, 0, 0
};
static const ubyte ptwist[] = {
0, 0, 0, 0, 0, 0, 0, 0,
47, 35, 23, 11, 10, 22, 34, 46,
45, 33, 21, 9, 8, 20, 32, 44,
43, 31, 19, 7, 6, 18, 30, 42,
41, 29, 17, 5, 4, 16, 28, 40,
39, 27, 15, 3, 2, 14, 26, 38,
37, 25, 13, 1, 0, 12, 24, 36,
0, 0, 0, 0, 0, 0, 0, 0
};
static const ubyte invflap[] = {
8, 16, 24, 32, 40, 48,
9, 17, 25, 33, 41, 49,
10, 18, 26, 34, 42, 50,
11, 19, 27, 35, 43, 51
};
static const ubyte invptwist[] = {
52, 51, 44, 43, 36, 35, 28, 27, 20, 19, 12, 11,
53, 50, 45, 42, 37, 34, 29, 26, 21, 18, 13, 10,
54, 49, 46, 41, 38, 33, 30, 25, 22, 17, 14, 9,
55, 48, 47, 40, 39, 32, 31, 24, 23, 16, 15, 8
};
static const ubyte file_to_file[] = {
0, 1, 2, 3, 3, 2, 1, 0
};
static const short KK_idx[10][64] = {
{ -1, -1, -1, 0, 1, 2, 3, 4,
-1, -1, -1, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 41,
42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 55, 56, 57 },
{ 58, -1, -1, -1, 59, 60, 61, 62,
63, -1, -1, -1, 64, 65, 66, 67,
68, 69, 70, 71, 72, 73, 74, 75,
76, 77, 78, 79, 80, 81, 82, 83,
84, 85, 86, 87, 88, 89, 90, 91,
92, 93, 94, 95, 96, 97, 98, 99,
100,101,102,103,104,105,106,107,
108,109,110,111,112,113,114,115},
{116,117, -1, -1, -1,118,119,120,
121,122, -1, -1, -1,123,124,125,
126,127,128,129,130,131,132,133,
134,135,136,137,138,139,140,141,
142,143,144,145,146,147,148,149,
150,151,152,153,154,155,156,157,
158,159,160,161,162,163,164,165,
166,167,168,169,170,171,172,173 },
{174, -1, -1, -1,175,176,177,178,
179, -1, -1, -1,180,181,182,183,
184, -1, -1, -1,185,186,187,188,
189,190,191,192,193,194,195,196,
197,198,199,200,201,202,203,204,
205,206,207,208,209,210,211,212,
213,214,215,216,217,218,219,220,
221,222,223,224,225,226,227,228 },
{229,230, -1, -1, -1,231,232,233,
234,235, -1, -1, -1,236,237,238,
239,240, -1, -1, -1,241,242,243,
244,245,246,247,248,249,250,251,
252,253,254,255,256,257,258,259,
260,261,262,263,264,265,266,267,
268,269,270,271,272,273,274,275,
276,277,278,279,280,281,282,283 },
{284,285,286,287,288,289,290,291,
292,293, -1, -1, -1,294,295,296,
297,298, -1, -1, -1,299,300,301,
302,303, -1, -1, -1,304,305,306,
307,308,309,310,311,312,313,314,
315,316,317,318,319,320,321,322,
323,324,325,326,327,328,329,330,
331,332,333,334,335,336,337,338 },
{ -1, -1,339,340,341,342,343,344,
-1, -1,345,346,347,348,349,350,
-1, -1,441,351,352,353,354,355,
-1, -1, -1,442,356,357,358,359,
-1, -1, -1, -1,443,360,361,362,
-1, -1, -1, -1, -1,444,363,364,
-1, -1, -1, -1, -1, -1,445,365,
-1, -1, -1, -1, -1, -1, -1,446 },
{ -1, -1, -1,366,367,368,369,370,
-1, -1, -1,371,372,373,374,375,
-1, -1, -1,376,377,378,379,380,
-1, -1, -1,447,381,382,383,384,
-1, -1, -1, -1,448,385,386,387,
-1, -1, -1, -1, -1,449,388,389,
-1, -1, -1, -1, -1, -1,450,390,
-1, -1, -1, -1, -1, -1, -1,451 },
{452,391,392,393,394,395,396,397,
-1, -1, -1, -1,398,399,400,401,
-1, -1, -1, -1,402,403,404,405,
-1, -1, -1, -1,406,407,408,409,
-1, -1, -1, -1,453,410,411,412,
-1, -1, -1, -1, -1,454,413,414,
-1, -1, -1, -1, -1, -1,455,415,
-1, -1, -1, -1, -1, -1, -1,456 },
{457,416,417,418,419,420,421,422,
-1,458,423,424,425,426,427,428,
-1, -1, -1, -1, -1,429,430,431,
-1, -1, -1, -1, -1,432,433,434,
-1, -1, -1, -1, -1,435,436,437,
-1, -1, -1, -1, -1,459,438,439,
-1, -1, -1, -1, -1, -1,460,440,
-1, -1, -1, -1, -1, -1, -1,461 }
};
static int binomial[5][64];
static int pawnidx[5][24];
static int pfactor[5][4];
static void init_indices(void){
int i, j, k;
// binomial[k-1][n] = Bin(n, k)
for (i = 0; i < 5; i++)
for (j = 0; j < 64; j++) {
int f = j;
int l = 1;
for (k = 1; k <= i; k++) {
f *= (j - k);
l *= (k + 1);
}
binomial[i][j] = f / l;
}
for (i = 0; i < 5; i++) {
int s = 0;
for (j = 0; j < 6; j++) {
pawnidx[i][j] = s;
s += (i == 0) ? 1 : binomial[i - 1][ptwist[invflap[j]]];
}
pfactor[i][0] = s;
s = 0;
for (; j < 12; j++) {
pawnidx[i][j] = s;
s += (i == 0) ? 1 : binomial[i - 1][ptwist[invflap[j]]];
}
pfactor[i][1] = s;
s = 0;
for (; j < 18; j++) {
pawnidx[i][j] = s;
s += (i == 0) ? 1 : binomial[i - 1][ptwist[invflap[j]]];
}
pfactor[i][2] = s;
s = 0;
for (; j < 24; j++) {
pawnidx[i][j] = s;
s += (i == 0) ? 1 : binomial[i - 1][ptwist[invflap[j]]];
}
pfactor[i][3] = s;
}
}
static uint64 encode_piece(struct TBEntry_piece *ptr, ubyte *norm, int *pos, int *factor){
uint64 idx;
int i, j, k, m, l, p;
int n = ptr->num;
if (pos[0] & 0x04) {
for (i = 0; i < n; i++)
pos[i] ^= 0x07;
}
if (pos[0] & 0x20) {
for (i = 0; i < n; i++)
pos[i] ^= 0x38;
}
for (i = 0; i < n; i++)
if (offdiag[pos[i]]) break;
if (i < (ptr->enc_type == 0 ? 3 : 2) && offdiag[pos[i]] > 0)
for (i = 0; i < n; i++)
pos[i] = flipdiag[pos[i]];
switch (ptr->enc_type) {
case 0: /* 111 */
i = (pos[1] > pos[0]);
j = (pos[2] > pos[0]) + (pos[2] > pos[1]);
if (offdiag[pos[0]])
idx = triangle[pos[0]] * 63*62 + (pos[1] - i) * 62 + (pos[2] - j);
else if (offdiag[pos[1]])
idx = 6*63*62 + diag[pos[0]] * 28*62 + lower[pos[1]] * 62 + pos[2] - j;
else if (offdiag[pos[2]])
idx = 6*63*62 + 4*28*62 + (diag[pos[0]]) * 7*28 + (diag[pos[1]] - i) * 28 + lower[pos[2]];
else
idx = 6*63*62 + 4*28*62 + 4*7*28 + (diag[pos[0]] * 7*6) + (diag[pos[1]] - i) * 6 + (diag[pos[2]] - j);
i = 3;
break;
case 1: /* K3 */
j = (pos[2] > pos[0]) + (pos[2] > pos[1]);
idx = KK_idx[triangle[pos[0]]][pos[1]];
if (idx < 441)
idx = idx + 441 * (pos[2] - j);
else {
idx = 441*62 + (idx - 441) + 21 * lower[pos[2]];
if (!offdiag[pos[2]])
idx -= j * 21;
}
i = 3;
break;
default: /* K2 */
idx = KK_idx[triangle[pos[0]]][pos[1]];
i = 2;
break;
}
idx *= factor[0];
for (; i < n;) {
int t = norm[i];
for (j = i; j < i + t; j++)
for (k = j + 1; k < i + t; k++)
if (pos[j] > pos[k]) Swap(pos[j], pos[k]);
int s = 0;
for (m = i; m < i + t; m++) {
p = pos[m];
for (l = 0, j = 0; l < i; l++)
j += (p > pos[l]);
s += binomial[m - i][p - j];
}
idx += ((uint64)s) * ((uint64)factor[i]);
i += t;
}
return idx;
}
// determine file of leftmost pawn and sort pawns
static int pawn_file(struct TBEntry_pawn *ptr, int *pos){
int i;
for (i = 1; i < ptr->pawns[0]; i++)
if (flap[pos[0]] > flap[pos[i]])
Swap(pos[0], pos[i]);
return file_to_file[pos[0] & 0x07];
}
static uint64 encode_pawn(struct TBEntry_pawn *ptr, ubyte *norm, int *pos, int *factor){
uint64 idx;
int i, j, k, m, s, t;
int n = ptr->num;
if (pos[0] & 0x04)
for (i = 0; i < n; i++)
pos[i] ^= 0x07;
for (i = 1; i < ptr->pawns[0]; i++)
for (j = i + 1; j < ptr->pawns[0]; j++)
if (ptwist[pos[i]] < ptwist[pos[j]])
Swap(pos[i], pos[j]);
t = ptr->pawns[0] - 1;
idx = pawnidx[t][flap[pos[0]]];
for (i = t; i > 0; i--)
idx += binomial[t - i][ptwist[pos[i]]];
idx *= factor[0];
// remaining pawns
i = ptr->pawns[0];
t = i + ptr->pawns[1];
if (t > i) {
for (j = i; j < t; j++)
for (k = j + 1; k < t; k++)
if (pos[j] > pos[k]) Swap(pos[j], pos[k]);
s = 0;
for (m = i; m < t; m++) {
int p = pos[m];
for (k = 0, j = 0; k < i; k++)
j += (p > pos[k]);
s += binomial[m - i][p - j - 8];
}
idx += ((uint64)s) * ((uint64)factor[i]);
i = t;
}
for (; i < n;) {
t = norm[i];
for (j = i; j < i + t; j++)
for (k = j + 1; k < i + t; k++)
if (pos[j] > pos[k]) Swap(pos[j], pos[k]);
s = 0;
for (m = i; m < i + t; m++) {
int p = pos[m];
for (k = 0, j = 0; k < i; k++)
j += (p > pos[k]);
s += binomial[m - i][p - j];
}
idx += ((uint64)s) * ((uint64)factor[i]);
i += t;
}
return idx;
}
// place k like pieces on n squares
static int subfactor(int k, int n){
int i, f, l;
f = n;
l = 1;
for (i = 1; i < k; i++) {
f *= n - i;
l *= i + 1;
}
return f / l;
}
static uint64 calc_factors_piece(int *factor, int num, int order, ubyte *norm, ubyte enc_type){
int i, k, n;
uint64 f;
static int pivfac[] = { 31332, 28056, 462 };
n = 64 - norm[0];
f = 1;
for (i = norm[0], k = 0; i < num || k == order; k++) {
if (k == order) {
factor[0] = static_cast<int>(f);
f *= pivfac[enc_type];
} else {
factor[i] = static_cast<int>(f);
f *= subfactor(norm[i], n);
n -= norm[i];
i += norm[i];
}
}
return f;
}
static uint64 calc_factors_pawn(int *factor, int num, int order, int order2, ubyte *norm, int file){
int i, k, n;
uint64 f;
i = norm[0];
if (order2 < 0x0f) i += norm[i];
n = 64 - i;
f = 1;
for (k = 0; i < num || k == order || k == order2; k++) {
if (k == order) {
factor[0] = static_cast<int>(f);
f *= pfactor[norm[0] - 1][file];
} else if (k == order2) {
factor[norm[0]] = static_cast<int>(f);
f *= subfactor(norm[norm[0]], 48 - norm[0]);
} else {
factor[i] = static_cast<int>(f);
f *= subfactor(norm[i], n);
n -= norm[i];
i += norm[i];
}
}
return f;
}
static void set_norm_piece(struct TBEntry_piece *ptr, ubyte *norm, ubyte *pieces){
int i, j;
for (i = 0; i < ptr->num; i++)
norm[i] = 0;
switch (ptr->enc_type) {
case 0:
norm[0] = 3;
break;
case 2:
norm[0] = 2;
break;
default:
norm[0] = ubyte(ptr->enc_type - 1);
break;
}
for (i = norm[0]; i < ptr->num; i += norm[i])
for (j = i; j < ptr->num && pieces[j] == pieces[i]; j++)
norm[i]++;
}
static void set_norm_pawn(struct TBEntry_pawn *ptr, ubyte *norm, ubyte *pieces){
int i, j;
for (i = 0; i < ptr->num; i++)
norm[i] = 0;
norm[0] = ptr->pawns[0];
if (ptr->pawns[1]) norm[ptr->pawns[0]] = ptr->pawns[1];
for (i = ptr->pawns[0] + ptr->pawns[1]; i < ptr->num; i += norm[i])
for (j = i; j < ptr->num && pieces[j] == pieces[i]; j++)
norm[i]++;
}
static void setup_pieces_piece(struct TBEntry_piece *ptr, unsigned char *data, uint64 *tb_size){
int i,order;
for (i = 0; i < ptr->num; i++)
ptr->pieces[0][i] = ubyte(data[i + 1] & 0x0f);
order = data[0] & 0x0f;
set_norm_piece(ptr, ptr->norm[0], ptr->pieces[0]);
tb_size[0] = calc_factors_piece(ptr->factor[0], ptr->num, order, ptr->norm[0], ptr->enc_type);
for (i = 0; i < ptr->num; i++)
ptr->pieces[1][i] = ubyte(data[i + 1] >> 4);
order = data[0] >> 4;
set_norm_piece(ptr, ptr->norm[1], ptr->pieces[1]);
tb_size[1] = calc_factors_piece(ptr->factor[1], ptr->num, order, ptr->norm[1], ptr->enc_type);
}
static void setup_pieces_piece_dtz(struct DTZEntry_piece *ptr, unsigned char *data, uint64 *tb_size){
int i,order;
for (i = 0; i < ptr->num; i++)
ptr->pieces[i] = ubyte(data[i + 1] & 0x0f);
order = data[0] & 0x0f;
set_norm_piece((struct TBEntry_piece *)ptr, ptr->norm, ptr->pieces);
tb_size[0] = calc_factors_piece(ptr->factor, ptr->num, order, ptr->norm, ptr->enc_type);
}
static void setup_pieces_pawn(struct TBEntry_pawn *ptr, unsigned char *data, uint64 *tb_size, int f){
int i, j, order, order2;
j = 1 + (ptr->pawns[1] > 0);
order = data[0] & 0x0f;
order2 = ptr->pawns[1] ? (data[1] & 0x0f) : 0x0f;
for (i = 0; i < ptr->num; i++)
ptr->file[f].pieces[0][i] = ubyte(data[i + j] & 0x0f);
set_norm_pawn(ptr, ptr->file[f].norm[0], ptr->file[f].pieces[0]);
tb_size[0] = calc_factors_pawn(ptr->file[f].factor[0], ptr->num, order, order2, ptr->file[f].norm[0], f);
order = data[0] >> 4;
order2 = ptr->pawns[1] ? (data[1] >> 4) : 0x0f;
for (i = 0; i < ptr->num; i++)
ptr->file[f].pieces[1][i] = ubyte(data[i + j] >> 4);
set_norm_pawn(ptr, ptr->file[f].norm[1], ptr->file[f].pieces[1]);
tb_size[1] = calc_factors_pawn(ptr->file[f].factor[1], ptr->num, order, order2, ptr->file[f].norm[1], f);
}
static void setup_pieces_pawn_dtz(struct DTZEntry_pawn *ptr, unsigned char *data, uint64 *tb_size, int f){
int i, j, order, order2;
j = 1 + (ptr->pawns[1] > 0);
order = data[0] & 0x0f;
order2 = ptr->pawns[1] ? (data[1] & 0x0f) : 0x0f;
for (i = 0; i < ptr->num; i++)
ptr->file[f].pieces[i] = ubyte(data[i + j] & 0x0f);
set_norm_pawn((struct TBEntry_pawn *)ptr, ptr->file[f].norm, ptr->file[f].pieces);
tb_size[0] = calc_factors_pawn(ptr->file[f].factor, ptr->num, order, order2, ptr->file[f].norm, f);
}
static void calc_symlen(struct PairsData *d, int s, char *tmp){
int s1, s2;
ubyte* w = d->sympat + 3 * s;
s2 = (w[2] << 4) | (w[1] >> 4);
if (s2 == 0x0fff)
d->symlen[s] = 0;
else {
s1 = ((w[1] & 0xf) << 8) | w[0];
if (!tmp[s1]) calc_symlen(d, s1, tmp);
if (!tmp[s2]) calc_symlen(d, s2, tmp);
d->symlen[s] = ubyte(d->symlen[s1] + d->symlen[s2] + 1);
}
tmp[s] = 1;
}
ushort ReadUshort(ubyte* d) {
return ushort(d[0] | (d[1] << 8));
}
uint32 ReadUint32(ubyte* d) {
return d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
}
static struct PairsData *setup_pairs(unsigned char *data, uint64 tb_size, uint64 *size, unsigned char **next, ubyte *flags, int wdl){
struct PairsData *d;
int i;
*flags = data[0];
if (data[0] & 0x80) {
d = (struct PairsData *)lm(sizeof(struct PairsData));
d->idxbits = 0;
if (wdl)
d->min_len = data[1];
else
d->min_len = 0;
*next = data + 2;
size[0] = size[1] = size[2] = 0;
return d;
}
int blocksize = data[1];
int idxbits = data[2];
int real_num_blocks = ReadUint32(&data[4]);
int num_blocks = real_num_blocks + *(ubyte *)(&data[3]);
int max_len = data[8];
int min_len = data[9];
int h = max_len - min_len + 1;
int num_syms = ReadUshort(&data[10 + 2 * h]);
d = (struct PairsData *)lm(sizeof(struct PairsData) + (h - 1) * sizeof(base_t) + num_syms);
d->blocksize = blocksize;
d->idxbits = idxbits;
d->offset = (ushort*)(&data[10]);
d->symlen = ((ubyte *)d) + sizeof(struct PairsData) + (h - 1) * sizeof(base_t);
d->sympat = &data[12 + 2 * h];
d->min_len = min_len;
*next = &data[12 + 2 * h + 3 * num_syms + (num_syms & 1)];
uint64 num_indices = (tb_size + (1ULL << idxbits) - 1) >> idxbits;
size[0] = 6ULL * num_indices;
size[1] = 2ULL * num_blocks;
size[2] = (1ULL << blocksize) * real_num_blocks;
char tmp[4096];
for (i = 0; i < num_syms; i++)
tmp[i] = 0;
for (i = 0; i < num_syms; i++)
if (!tmp[i])
calc_symlen(d, i, tmp);
d->base[h - 1] = 0;
for (i = h - 2; i >= 0; i--)
d->base[i] = (d->base[i + 1] + ReadUshort((ubyte*)(d->offset + i)) - ReadUshort((ubyte*)(d->offset + i + 1))) / 2;
for (i = 0; i < h; i++)
d->base[i] <<= 64 - (min_len + i);
d->offset -= d->min_len;
return d;
}
static int init_table_wdl(struct TBEntry *entry, char *str){
ubyte *next;
int f, s;
uint64 tb_size[8];
uint64 size[8 * 3];
ubyte flags;
// first mmap the table into memory
entry->data = map_file(str, WDLSUFFIX, &entry->mapping);
if (!entry->data) {
#if ENGINE
pass_message_to_GUI("Could not find table\n");
#endif
return 0;
}
ubyte *data = (ubyte *)entry->data;