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pgn-encoder.js
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/*
* pgn4web javascript chessboard
* copyright (C) 2009, 2010 Paolo Casaschi
* see README file and http://pgn4web.casaschi.net
* for credits, license and more details
*
* Huffman encoding/decoding derived from code at http://rumkin.com/tools/compression/compress_huff.php
*/
// version 1 of PGN encoding:
// encodedPGN = nnn$xxx0
// nnn = number representing bytes length of the decoded message
// $ = dollar char (delimiter for length info)
// xxx = encoded text (using LetterCodes below)
// 0 = zero char (version marker)
var encodingCharSet_dec;
var encodingCharSet_enc;
var encodingCharSet = encodingCharSet_enc = "$0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
var encodingVersion_dec;
var encodingVersion_enc;
var encodingVersion = encodingVersion_enc = 1;
if (((encodingCharSet_dec != undefined) && (encodingCharSet_enc != encodingCharSet_dec)) ||
((encodingVersion_dec != undefined) && (encodingVersion_enc != encodingVersion_dec))) {
errorString = "error: PGN encoding/decoding version/charset mismatch";
if (typeof myAlert == "function") { myAlert(errorString); }
else { alert(errorString); }
}
function EncodePGN(ov) {
function BitsToBytes(i) {
o = 0;
if (i.charAt(0) == '1') { o += 32; }
if (i.charAt(1) == '1') { o += 16; }
if (i.charAt(2) == '1') { o += 8; }
if (i.charAt(3) == '1') { o += 4; }
if (i.charAt(4) == '1') { o += 2; }
if (i.charAt(5) == '1') { o += 1; }
return encodingCharSet.charAt(o);
}
var LetterCodes = new Array(256);
LetterCodes[0] = '00111111111111110';
LetterCodes[1] = '0101101';
LetterCodes[2] = '00111111111111111';
LetterCodes[3] = '00111111111111100';
LetterCodes[4] = '00111111111111101';
LetterCodes[5] = '000011111111111010';
LetterCodes[6] = '000011111111111011';
LetterCodes[7] = '000011111111111000';
LetterCodes[8] = '000011111111111001';
LetterCodes[9] = '000011111111111110';
LetterCodes[10] = '0101100';
LetterCodes[11] = '000011111111111111';
LetterCodes[12] = '000011111111111100';
LetterCodes[13] = '0011100';
LetterCodes[14] = '000011111111111101';
LetterCodes[15] = '000011111111110010';
LetterCodes[16] = '000011111111110011';
LetterCodes[17] = '000011111111110000';
LetterCodes[18] = '000011111111110001';
LetterCodes[19] = '000011111111110110';
LetterCodes[20] = '000011111111110111';
LetterCodes[21] = '000011111111110100';
LetterCodes[22] = '000011111111110101';
LetterCodes[23] = '1111111111110101010';
LetterCodes[24] = '1111111111110101011';
LetterCodes[25] = '1111111111110101000';
LetterCodes[26] = '1111111111110101001';
LetterCodes[27] = '1111111111110101110';
LetterCodes[28] = '1111111111110101111';
LetterCodes[29] = '1111111111110101100';
LetterCodes[30] = '1111111111110101101';
LetterCodes[31] = '1111111111110100010';
LetterCodes[32] = '1000';
LetterCodes[33] = '101111111110';
LetterCodes[34] = '00010';
LetterCodes[35] = '11111111110';
LetterCodes[36] = '0011111111110';
LetterCodes[37] = '1011111111110';
LetterCodes[38] = '00001111111110';
LetterCodes[39] = '00111111110';
LetterCodes[40] = '0011101';
LetterCodes[41] = '111111110';
LetterCodes[42] = '11001111111110';
LetterCodes[43] = '1111110';
LetterCodes[44] = '000011110';
LetterCodes[45] = '0011110';
LetterCodes[46] = '00000';
LetterCodes[47] = '0110110';
LetterCodes[48] = '010100';
LetterCodes[49] = '00110';
LetterCodes[50] = '01000';
LetterCodes[51] = '01100';
LetterCodes[52] = '11000';
LetterCodes[53] = '11010';
LetterCodes[54] = '11100';
LetterCodes[55] = '001010';
LetterCodes[56] = '011100';
LetterCodes[57] = '0001110';
LetterCodes[58] = '001111111110';
LetterCodes[59] = '1111111111100';
LetterCodes[60] = '10111111110';
LetterCodes[61] = '1100110100';
LetterCodes[62] = '000011111110';
LetterCodes[63] = '00011110';
LetterCodes[64] = '1100111111110';
LetterCodes[65] = '110011100';
LetterCodes[66] = '000010';
LetterCodes[67] = '10111110';
LetterCodes[68] = '00111110';
LetterCodes[69] = '0010110';
LetterCodes[70] = '110011101';
LetterCodes[71] = '110011110';
LetterCodes[72] = '1100110101';
LetterCodes[73] = '0010111110';
LetterCodes[74] = '11001111110';
LetterCodes[75] = '101110';
LetterCodes[76] = '1100111110';
LetterCodes[77] = '101111110';
LetterCodes[78] = '000110';
LetterCodes[79] = '0101110';
LetterCodes[80] = '1011110';
LetterCodes[81] = '011101';
LetterCodes[82] = '11101';
LetterCodes[83] = '11001100';
LetterCodes[84] = '001111110';
LetterCodes[85] = '0000111110';
LetterCodes[86] = '1111111110';
LetterCodes[87] = '11111110';
LetterCodes[88] = '110011111110';
LetterCodes[89] = '0000111111110';
LetterCodes[90] = '1011111110';
LetterCodes[91] = '10010';
LetterCodes[92] = '00111111111110';
LetterCodes[93] = '10011';
LetterCodes[94] = '11001111111111';
LetterCodes[95] = '11111111111010';
LetterCodes[96] = '10111111111110';
LetterCodes[97] = '11110';
LetterCodes[98] = '011010';
LetterCodes[99] = '10100';
LetterCodes[100] = '11011';
LetterCodes[101] = '00100';
LetterCodes[102] = '010010';
LetterCodes[103] = '010011';
LetterCodes[104] = '011110';
LetterCodes[105] = '0000110';
LetterCodes[106] = '00001111110';
LetterCodes[107] = '00001110';
LetterCodes[108] = '110010';
LetterCodes[109] = '000111110';
LetterCodes[110] = '010101';
LetterCodes[111] = '111110';
LetterCodes[112] = '0110111';
LetterCodes[113] = '1100110110';
LetterCodes[114] = '0111110';
LetterCodes[115] = '0111111';
LetterCodes[116] = '10110';
LetterCodes[117] = '0101111';
LetterCodes[118] = '00101110';
LetterCodes[119] = '000111111';
LetterCodes[120] = '10101';
LetterCodes[121] = '001011110';
LetterCodes[122] = '1100110111';
LetterCodes[123] = '0010111111';
LetterCodes[124] = '001111111111110';
LetterCodes[125] = '0011111110';
LetterCodes[126] = '111111111110110';
LetterCodes[127] = '1111111111110100011';
LetterCodes[128] = '1111111111110100000';
LetterCodes[129] = '1111111111110100001';
LetterCodes[130] = '1111111111110100110';
LetterCodes[131] = '1111111111110100111';
LetterCodes[132] = '1111111111110100100';
LetterCodes[133] = '1111111111110100101';
LetterCodes[134] = '1111111111110111010';
LetterCodes[135] = '1111111111110111011';
LetterCodes[136] = '1111111111110111000';
LetterCodes[137] = '1111111111110111001';
LetterCodes[138] = '1111111111110111110';
LetterCodes[139] = '1111111111110111111';
LetterCodes[140] = '1111111111110111100';
LetterCodes[141] = '1111111111110111101';
LetterCodes[142] = '1111111111110110010';
LetterCodes[143] = '1111111111110110011';
LetterCodes[144] = '1111111111110110000';
LetterCodes[145] = '1111111111110110001';
LetterCodes[146] = '1111111111110110110';
LetterCodes[147] = '1111111111110110111';
LetterCodes[148] = '1111111111110110100';
LetterCodes[149] = '1111111111110110101';
LetterCodes[150] = '1111111111110001010';
LetterCodes[151] = '1111111111110001011';
LetterCodes[152] = '1111111111110001000';
LetterCodes[153] = '1111111111110001001';
LetterCodes[154] = '1111111111110001110';
LetterCodes[155] = '1111111111110001111';
LetterCodes[156] = '1111111111110001100';
LetterCodes[157] = '1111111111110001101';
LetterCodes[158] = '1111111111110000010';
LetterCodes[159] = '1111111111110000011';
LetterCodes[160] = '1111111111110000000';
LetterCodes[161] = '1111111111110000001';
LetterCodes[162] = '1111111111110000110';
LetterCodes[163] = '1111111111110000111';
LetterCodes[164] = '1111111111110000100';
LetterCodes[165] = '1111111111110000101';
LetterCodes[166] = '1111111111110011010';
LetterCodes[167] = '1111111111110011011';
LetterCodes[168] = '1111111111110011000';
LetterCodes[169] = '1111111111110011001';
LetterCodes[170] = '1111111111110011110';
LetterCodes[171] = '1111111111110011111';
LetterCodes[172] = '1111111111110011100';
LetterCodes[173] = '1111111111110011101';
LetterCodes[174] = '1111111111110010010';
LetterCodes[175] = '1111111111110010011';
LetterCodes[176] = '1111111111110010000';
LetterCodes[177] = '1111111111110010001';
LetterCodes[178] = '1111111111110010110';
LetterCodes[179] = '1111111111110010111';
LetterCodes[180] = '1111111111110010100';
LetterCodes[181] = '1111111111110010101';
LetterCodes[182] = '1111111111111101010';
LetterCodes[183] = '1111111111111101011';
LetterCodes[184] = '1111111111111101000';
LetterCodes[185] = '1111111111111101001';
LetterCodes[186] = '1111111111111101110';
LetterCodes[187] = '1111111111111101111';
LetterCodes[188] = '1111111111111101100';
LetterCodes[189] = '1111111111111101101';
LetterCodes[190] = '1111111111111100010';
LetterCodes[191] = '1111111111111100011';
LetterCodes[192] = '1111111111111100000';
LetterCodes[193] = '1111111111111100001';
LetterCodes[194] = '1111111111111100110';
LetterCodes[195] = '1111111111111100111';
LetterCodes[196] = '1111111111111100100';
LetterCodes[197] = '1111111111111100101';
LetterCodes[198] = '1111111111111111010';
LetterCodes[199] = '1111111111111111011';
LetterCodes[200] = '1111111111111111000';
LetterCodes[201] = '1111111111111111001';
LetterCodes[202] = '1111111111111111110';
LetterCodes[203] = '1111111111111111111';
LetterCodes[204] = '1111111111111111100';
LetterCodes[205] = '1111111111111111101';
LetterCodes[206] = '1111111111111110010';
LetterCodes[207] = '1111111111111110011';
LetterCodes[208] = '1111111111111110000';
LetterCodes[209] = '1111111111111110001';
LetterCodes[210] = '1111111111111110110';
LetterCodes[211] = '1111111111111110111';
LetterCodes[212] = '1111111111111110100';
LetterCodes[213] = '1111111111111110101';
LetterCodes[214] = '1111111111111001010';
LetterCodes[215] = '1111111111111001011';
LetterCodes[216] = '1111111111111001000';
LetterCodes[217] = '1111111111111001001';
LetterCodes[218] = '1111111111111001110';
LetterCodes[219] = '1111111111111001111';
LetterCodes[220] = '1111111111111001100';
LetterCodes[221] = '1111111111111001101';
LetterCodes[222] = '1111111111111000010';
LetterCodes[223] = '1111111111111000011';
LetterCodes[224] = '1111111111111000000';
LetterCodes[225] = '1111111111111000001';
LetterCodes[226] = '1111111111111000110';
LetterCodes[227] = '1111111111111000111';
LetterCodes[228] = '1111111111111000100';
LetterCodes[229] = '1111111111111000101';
LetterCodes[230] = '1111111111111011010';
LetterCodes[231] = '1111111111111011011';
LetterCodes[232] = '1111111111111011000';
LetterCodes[233] = '1111111111111011001';
LetterCodes[234] = '1111111111111011110';
LetterCodes[235] = '1111111111111011111';
LetterCodes[236] = '1111111111111011100';
LetterCodes[237] = '1111111111111011101';
LetterCodes[238] = '1111111111111010010';
LetterCodes[239] = '1111111111111010011';
LetterCodes[240] = '1111111111111010000';
LetterCodes[241] = '1111111111111010001';
LetterCodes[242] = '1111111111111010110';
LetterCodes[243] = '1111111111111010111';
LetterCodes[244] = '1111111111111010100';
LetterCodes[245] = '1111111111111010101';
LetterCodes[246] = '10111111111111010';
LetterCodes[247] = '10111111111111011';
LetterCodes[248] = '10111111111111000';
LetterCodes[249] = '10111111111111001';
LetterCodes[250] = '10111111111111110';
LetterCodes[251] = '10111111111111111';
LetterCodes[252] = '10111111111111100';
LetterCodes[253] = '10111111111111101';
LetterCodes[254] = '1111111111101110';
LetterCodes[255] = '1111111111101111';
// Build resulting data stream
// The bits string could get very large
bits = "";
bytes = ov.length + "$";
for (i = 0; i < ov.length; i ++) {
// converts ASCII chars above 255 to a star (code 42) avoiding decoding failure
if (ov.charCodeAt(i) > 255) { bits += LetterCodes[42]; }
else { bits += LetterCodes[ov.charCodeAt(i)]; }
while (bits.length > 5) {
bytes += BitsToBytes(bits);
bits = bits.slice(6, bits.length);
}
}
bytes += BitsToBytes(bits);
bytes += encodingCharSet.charAt(encodingVersion);
return bytes;
}