From: Benjamin Auder Date: Thu, 13 Dec 2018 14:39:26 +0000 (+0100) Subject: Add true repetition detection X-Git-Url: https://git.auder.net/doc/html/packages.html?a=commitdiff_plain;h=331fc58c932d6d7055b202d0c6dc0d77212a89f8;p=vchess.git Add true repetition detection --- diff --git a/TODO b/TODO deleted file mode 100644 index bb4d6e16..00000000 --- a/TODO +++ /dev/null @@ -1 +0,0 @@ -Full detection of repeated positions (including turn) diff --git a/public/javascripts/base_rules.js b/public/javascripts/base_rules.js index 5020094c..a10a43ca 100644 --- a/public/javascripts/base_rules.js +++ b/public/javascripts/base_rules.js @@ -54,6 +54,7 @@ class ChessRules constructor(fen, moves) { this.moves = moves; + this.hashStates = {}; //for repetitions detection // Use fen string to initialize variables, flags and board this.board = VariantRules.GetBoard(fen); this.setFlags(fen); @@ -727,6 +728,18 @@ class ChessRules this.kingPos[c] = [move.start.x, move.start.y]; } + // Store a hash of the position + flags + turn after a move is played + // (for repetitions detection) + addHashState() + { + const strToHash = this.getFen() + " " + this.turn; + const hash = hex_md5(strToHash); + if (!this.hashStates[hash]) + this.hashStates[hash] = 1; + else + this.hashStates[hash]++; + } + play(move, ingame) { // DEBUG: @@ -741,6 +754,9 @@ class ChessRules this.moves.push(move); this.epSquares.push( this.getEpSquare(move) ); VariantRules.PlayOnBoard(this.board, move); + + if (!!ingame) + this.addHashState(); } undo(move) @@ -760,22 +776,10 @@ class ChessRules ////////////// // END OF GAME - // Basic check for 3 repetitions (in the last moves only) - // TODO: extend to usual 3-repetition recognition (storing FEN with move?) + // Check for 3 repetitions (position + flags + turn) checkRepetition() { - if (this.moves.length >= 8) - { - const L = this.moves.length; - if (_.isEqual(this.moves[L-1], this.moves[L-5]) && - _.isEqual(this.moves[L-2], this.moves[L-6]) && - _.isEqual(this.moves[L-3], this.moves[L-7]) && - _.isEqual(this.moves[L-4], this.moves[L-8])) - { - return true; - } - } - return false; + return Object.values(this.hashStates).some(elt => { return (elt >= 3); }); } // Is game over ? And if yes, what is the score ? diff --git a/public/javascripts/components/game.js b/public/javascripts/components/game.js index 6af331b3..208e0482 100644 --- a/public/javascripts/components/game.js +++ b/public/javascripts/components/game.js @@ -1008,7 +1008,7 @@ Vue.component('my-game', { this.endGame(this.mycolor=="w"?"0-1":"1-0"); }, newGame: function(mode, fenInit, color, oppId, moves, continuation) { - const fen = "M7/8/8/3K1k2/8/8/8/8 0000";//fenInit || VariantRules.GenRandInitFen(); + const fen = fenInit || VariantRules.GenRandInitFen(); console.log(fen); //DEBUG if (mode=="human" && !oppId) { @@ -1066,7 +1066,7 @@ Vue.component('my-game', { } else if (mode == "computer") { - this.mycolor = "w";//Math.random() < 0.5 ? 'w' : 'b'; + this.mycolor = Math.random() < 0.5 ? 'w' : 'b'; if (this.mycolor == 'b') setTimeout(this.playComputerMove, 500); } diff --git a/public/javascripts/utils/md5.js b/public/javascripts/utils/md5.js new file mode 100644 index 00000000..24d190e4 --- /dev/null +++ b/public/javascripts/utils/md5.js @@ -0,0 +1,379 @@ +/* + * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message + * Digest Algorithm, as defined in RFC 1321. + * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009 + * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet + * Distributed under the BSD License + * See http://pajhome.org.uk/crypt/md5 for more info. + */ + +/* + * Configurable variables. You may need to tweak these to be compatible with + * the server-side, but the defaults work in most cases. + */ +var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */ +var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */ + +/* + * These are the functions you'll usually want to call + * They take string arguments and return either hex or base-64 encoded strings + */ +function hex_md5(s) { return rstr2hex(rstr_md5(str2rstr_utf8(s))); } +function b64_md5(s) { return rstr2b64(rstr_md5(str2rstr_utf8(s))); } +function any_md5(s, e) { return rstr2any(rstr_md5(str2rstr_utf8(s)), e); } +function hex_hmac_md5(k, d) + { return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); } +function b64_hmac_md5(k, d) + { return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); } +function any_hmac_md5(k, d, e) + { return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e); } + +/* + * Perform a simple self-test to see if the VM is working + */ +function md5_vm_test() +{ + return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"; +} + +/* + * Calculate the MD5 of a raw string + */ +function rstr_md5(s) +{ + return binl2rstr(binl_md5(rstr2binl(s), s.length * 8)); +} + +/* + * Calculate the HMAC-MD5, of a key and some data (raw strings) + */ +function rstr_hmac_md5(key, data) +{ + var bkey = rstr2binl(key); + if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8); + + var ipad = Array(16), opad = Array(16); + for(var i = 0; i < 16; i++) + { + ipad[i] = bkey[i] ^ 0x36363636; + opad[i] = bkey[i] ^ 0x5C5C5C5C; + } + + var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8); + return binl2rstr(binl_md5(opad.concat(hash), 512 + 128)); +} + +/* + * Convert a raw string to a hex string + */ +function rstr2hex(input) +{ + try { hexcase } catch(e) { hexcase=0; } + var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; + var output = ""; + var x; + for(var i = 0; i < input.length; i++) + { + x = input.charCodeAt(i); + output += hex_tab.charAt((x >>> 4) & 0x0F) + + hex_tab.charAt( x & 0x0F); + } + return output; +} + +/* + * Convert a raw string to a base-64 string + */ +function rstr2b64(input) +{ + try { b64pad } catch(e) { b64pad=''; } + var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + var output = ""; + var len = input.length; + for(var i = 0; i < len; i += 3) + { + var triplet = (input.charCodeAt(i) << 16) + | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0) + | (i + 2 < len ? input.charCodeAt(i+2) : 0); + for(var j = 0; j < 4; j++) + { + if(i * 8 + j * 6 > input.length * 8) output += b64pad; + else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F); + } + } + return output; +} + +/* + * Convert a raw string to an arbitrary string encoding + */ +function rstr2any(input, encoding) +{ + var divisor = encoding.length; + var i, j, q, x, quotient; + + /* Convert to an array of 16-bit big-endian values, forming the dividend */ + var dividend = Array(Math.ceil(input.length / 2)); + for(i = 0; i < dividend.length; i++) + { + dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1); + } + + /* + * Repeatedly perform a long division. The binary array forms the dividend, + * the length of the encoding is the divisor. Once computed, the quotient + * forms the dividend for the next step. All remainders are stored for later + * use. + */ + var full_length = Math.ceil(input.length * 8 / + (Math.log(encoding.length) / Math.log(2))); + var remainders = Array(full_length); + for(j = 0; j < full_length; j++) + { + quotient = Array(); + x = 0; + for(i = 0; i < dividend.length; i++) + { + x = (x << 16) + dividend[i]; + q = Math.floor(x / divisor); + x -= q * divisor; + if(quotient.length > 0 || q > 0) + quotient[quotient.length] = q; + } + remainders[j] = x; + dividend = quotient; + } + + /* Convert the remainders to the output string */ + var output = ""; + for(i = remainders.length - 1; i >= 0; i--) + output += encoding.charAt(remainders[i]); + + return output; +} + +/* + * Encode a string as utf-8. + * For efficiency, this assumes the input is valid utf-16. + */ +function str2rstr_utf8(input) +{ + var output = ""; + var i = -1; + var x, y; + + while(++i < input.length) + { + /* Decode utf-16 surrogate pairs */ + x = input.charCodeAt(i); + y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0; + if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) + { + x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF); + i++; + } + + /* Encode output as utf-8 */ + if(x <= 0x7F) + output += String.fromCharCode(x); + else if(x <= 0x7FF) + output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F), + 0x80 | ( x & 0x3F)); + else if(x <= 0xFFFF) + output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F), + 0x80 | ((x >>> 6 ) & 0x3F), + 0x80 | ( x & 0x3F)); + else if(x <= 0x1FFFFF) + output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07), + 0x80 | ((x >>> 12) & 0x3F), + 0x80 | ((x >>> 6 ) & 0x3F), + 0x80 | ( x & 0x3F)); + } + return output; +} + +/* + * Encode a string as utf-16 + */ +function str2rstr_utf16le(input) +{ + var output = ""; + for(var i = 0; i < input.length; i++) + output += String.fromCharCode( input.charCodeAt(i) & 0xFF, + (input.charCodeAt(i) >>> 8) & 0xFF); + return output; +} + +function str2rstr_utf16be(input) +{ + var output = ""; + for(var i = 0; i < input.length; i++) + output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF, + input.charCodeAt(i) & 0xFF); + return output; +} + +/* + * Convert a raw string to an array of little-endian words + * Characters >255 have their high-byte silently ignored. + */ +function rstr2binl(input) +{ + var output = Array(input.length >> 2); + for(var i = 0; i < output.length; i++) + output[i] = 0; + for(var i = 0; i < input.length * 8; i += 8) + output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32); + return output; +} + +/* + * Convert an array of little-endian words to a string + */ +function binl2rstr(input) +{ + var output = ""; + for(var i = 0; i < input.length * 32; i += 8) + output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF); + return output; +} + +/* + * Calculate the MD5 of an array of little-endian words, and a bit length. + */ +function binl_md5(x, len) +{ + /* append padding */ + x[len >> 5] |= 0x80 << ((len) % 32); + x[(((len + 64) >>> 9) << 4) + 14] = len; + + var a = 1732584193; + var b = -271733879; + var c = -1732584194; + var d = 271733878; + + for(var i = 0; i < x.length; i += 16) + { + var olda = a; + var oldb = b; + var oldc = c; + var oldd = d; + + a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936); + d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586); + c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819); + b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330); + a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897); + d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426); + c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341); + b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983); + a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416); + d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417); + c = md5_ff(c, d, a, b, x[i+10], 17, -42063); + b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162); + a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682); + d = md5_ff(d, a, b, c, x[i+13], 12, -40341101); + c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290); + b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329); + + a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510); + d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632); + c = md5_gg(c, d, a, b, x[i+11], 14, 643717713); + b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302); + a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691); + d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083); + c = md5_gg(c, d, a, b, x[i+15], 14, -660478335); + b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848); + a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438); + d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690); + c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961); + b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501); + a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467); + d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784); + c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473); + b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734); + + a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558); + d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463); + c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562); + b = md5_hh(b, c, d, a, x[i+14], 23, -35309556); + a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060); + d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353); + c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632); + b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640); + a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174); + d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222); + c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979); + b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189); + a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487); + d = md5_hh(d, a, b, c, x[i+12], 11, -421815835); + c = md5_hh(c, d, a, b, x[i+15], 16, 530742520); + b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651); + + a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844); + d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415); + c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905); + b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055); + a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571); + d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606); + c = md5_ii(c, d, a, b, x[i+10], 15, -1051523); + b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799); + a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359); + d = md5_ii(d, a, b, c, x[i+15], 10, -30611744); + c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380); + b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649); + a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070); + d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379); + c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259); + b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551); + + a = safe_add(a, olda); + b = safe_add(b, oldb); + c = safe_add(c, oldc); + d = safe_add(d, oldd); + } + return Array(a, b, c, d); +} + +/* + * These functions implement the four basic operations the algorithm uses. + */ +function md5_cmn(q, a, b, x, s, t) +{ + return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b); +} +function md5_ff(a, b, c, d, x, s, t) +{ + return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t); +} +function md5_gg(a, b, c, d, x, s, t) +{ + return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t); +} +function md5_hh(a, b, c, d, x, s, t) +{ + return md5_cmn(b ^ c ^ d, a, b, x, s, t); +} +function md5_ii(a, b, c, d, x, s, t) +{ + return md5_cmn(c ^ (b | (~d)), a, b, x, s, t); +} + +/* + * Add integers, wrapping at 2^32. This uses 16-bit operations internally + * to work around bugs in some JS interpreters. + */ +function safe_add(x, y) +{ + var lsw = (x & 0xFFFF) + (y & 0xFFFF); + var msw = (x >> 16) + (y >> 16) + (lsw >> 16); + return (msw << 16) | (lsw & 0xFFFF); +} + +/* + * Bitwise rotate a 32-bit number to the left. + */ +function bit_rol(num, cnt) +{ + return (num << cnt) | (num >>> (32 - cnt)); +} diff --git a/views/variant.pug b/views/variant.pug index 561663c7..7de86ca3 100644 --- a/views/variant.pug +++ b/views/variant.pug @@ -18,6 +18,7 @@ block javascripts script(src="/javascripts/utils/misc.js") script(src="/javascripts/utils/socket_url.js") script(src="/javascripts/utils/array.js") + script(src="/javascripts/utils/md5.js") script(src="/javascripts/base_rules.js") script(src="/javascripts/variants/" + variant + ".js") script.