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encoder-decoder-test.html
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encoder-decoder-test.html
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<html>
<!--
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
PLEASE NOTE THIS FILE IS USED ONLY TO FINE TUNE HUFFMANN ENCODING:
actual functions for PGN encoding/decoding are contained in pgn-decoder.js and pgn-encoder.js
-->
<head>
<title>pgn4web PGN encoder/decoder test</title>
<link rel="shortcut icon" href="pawn.ico" />
<script type="text/javascript">
// fix this to use customized letter distribution
var USE_PRESET_LETTER_DISTRIBUTION = true;
// fix this once you have the letter codes corresponding to the letter distribution above
var USE_PRESET_LETTER_CODES = true;
// fix this once you have the decoding values l[] corresponding to the letter codes above
var USE_PRESET_DECODING_SET = true;
var encodingCharSet = "$0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
var encodingVersion = 1;
// version 1 of PGN encoding:
// encodedPGN = nnn$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)
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);
}
function EncodePGN(ov) {
var Letters = new Array(256);
var LetterCodes = new Array(256);
for (i = 0; i < 256; i ++) { Letters[i] = 0; }
for (i = 0; i < ov.length; i ++) { Letters[ov.charCodeAt(i)]++; }
if (USE_PRESET_LETTER_DISTRIBUTION) {
Letters[0] = 1;
Letters[1] = 1;
Letters[2] = 1;
Letters[3] = 1;
Letters[4] = 1;
Letters[5] = 1;
Letters[6] = 1;
Letters[7] = 1;
Letters[8] = 1;
Letters[9] = 1;
Letters[10] = 25000;
Letters[11] = 1;
Letters[12] = 1;
Letters[13] = 25000;
Letters[14] = 1;
Letters[15] = 1;
Letters[16] = 1;
Letters[17] = 1;
Letters[18] = 1;
Letters[19] = 1;
Letters[20] = 1;
Letters[21] = 1;
Letters[22] = 1;
Letters[23] = 1;
Letters[24] = 1;
Letters[25] = 1;
Letters[26] = 1;
Letters[27] = 1;
Letters[28] = 1;
Letters[29] = 1;
Letters[30] = 1;
Letters[31] = 1;
Letters[32] = 273240;
Letters[33] = 200; // !
Letters[34] = 64928; // "
Letters[35] = 326; // #
Letters[36] = 163; // $
Letters[37] = 25; // %
Letters[38] = 25; // &
Letters[39] = 500; // '
Letters[40] = 1607; // (
Letters[41] = 1592; // )
Letters[42] = 10; // *
Letters[43] = 9086; // +
Letters[44] = 4231; // ,
Letters[45] = 11848; // -
Letters[46] = 91283; // .
Letters[47] = 9685; // /
Letters[48] = 27308; // 0
Letters[49] = 57229; // 1
Letters[50] = 57065; // 2
Letters[51] = 49049; // 3
Letters[52] = 46441; // 4
Letters[53] = 42430; // 5
Letters[54] = 38872; // 6
Letters[55] = 27853; // 7
Letters[56] = 21292; // 8
Letters[57] = 14627; // 9
Letters[58] = 270; // :
Letters[59] = 136; // ;
Letters[60] = 290; // <
Letters[61] = 1015; // =
Letters[62] = 290; // >
Letters[63] = 7511; // ?
Letters[64] = 100; // @
Letters[65] = 3580; // A
Letters[66] = 31461; // B
Letters[67] = 4369; // C
Letters[68] = 6993; // D
Letters[69] = 13777; // E
Letters[70] = 1719; // F
Letters[71] = 1902; // G
Letters[72] = 639; // H
Letters[73] = 1054; // I
Letters[74] = 420; // J
Letters[75] = 16962; // K
Letters[76] = 961; // L
Letters[77] = 1378; // M
Letters[78] = 29494; // N
Letters[79] = 10671; // O
Letters[80] = 7817; // P
Letters[81] = 19645; // Q
Letters[82] = 34436; // R
Letters[83] = 5795; // S
Letters[84] = 2037; // T
Letters[85] = 1364; // U
Letters[86] = 621; // V
Letters[87] = 5270; // W
Letters[88] = 249; // X
Letters[89] = 185; // Y
Letters[90] = 620; // Z
Letters[91] = 31633; // [
Letters[92] = 15; // \
Letters[93] = 31628; // ]
Letters[94] = 10; // ^
Letters[95] = 15; // _
Letters[96] = 10; // `
Letters[97] = 35573; // a
Letters[98] = 19456; // b
Letters[99] = 33228; // c
Letters[100] = 36380; // d
Letters[101] = 64738; // e
Letters[102] = 25736; // f
Letters[103] = 19801; // g
Letters[104] = 20415; // h
Letters[105] = 16706; // i
Letters[106] = 530; // j
Letters[107] = 7806; // k
Letters[108] = 18510; // l
Letters[109] = 3044; // m
Letters[110] = 20680; // n
Letters[111] = 17771; // o
Letters[112] = 9101; // p
Letters[113] = 903; // q
Letters[114] = 10153; // r
Letters[115] = 9963; // s
Letters[116] = 32763; // t
Letters[117] = 10268; // u
Letters[118] = 7508; // v
Letters[119] = 2173; // w
Letters[120] = 32913; // x
Letters[121] = 2135; // y
Letters[122] = 722; // z
Letters[123] = 1000; // {
Letters[124] = 10; // |
Letters[125] = 1000; // }
Letters[126] = 10; // ~
Letters[127] = 1;
Letters[128] = 1;
Letters[129] = 1;
Letters[130] = 1;
Letters[131] = 1;
Letters[132] = 1;
Letters[133] = 1;
Letters[134] = 1;
Letters[135] = 1;
Letters[136] = 1;
Letters[137] = 1;
Letters[138] = 1;
Letters[139] = 1;
Letters[140] = 1;
Letters[141] = 1;
Letters[142] = 1;
Letters[143] = 1;
Letters[144] = 1;
Letters[145] = 1;
Letters[146] = 1;
Letters[147] = 1;
Letters[148] = 1;
Letters[149] = 1;
Letters[150] = 1;
Letters[151] = 1;
Letters[152] = 1;
Letters[153] = 1;
Letters[154] = 1;
Letters[155] = 1;
Letters[156] = 1;
Letters[157] = 1;
Letters[158] = 1;
Letters[159] = 1;
Letters[160] = 1;
Letters[161] = 1;
Letters[162] = 1;
Letters[163] = 1;
Letters[164] = 1;
Letters[165] = 1;
Letters[166] = 1;
Letters[167] = 1;
Letters[168] = 1;
Letters[169] = 1;
Letters[170] = 1;
Letters[171] = 1;
Letters[172] = 1;
Letters[173] = 1;
Letters[174] = 1;
Letters[175] = 1;
Letters[176] = 1;
Letters[177] = 1;
Letters[178] = 1;
Letters[179] = 1;
Letters[180] = 1;
Letters[181] = 1;
Letters[182] = 1;
Letters[183] = 1;
Letters[184] = 1;
Letters[185] = 1;
Letters[186] = 1;
Letters[187] = 1;
Letters[188] = 1;
Letters[189] = 1;
Letters[190] = 1;
Letters[191] = 1;
Letters[192] = 1;
Letters[193] = 1;
Letters[194] = 1;
Letters[195] = 1;
Letters[196] = 1;
Letters[197] = 1;
Letters[198] = 1;
Letters[199] = 1;
Letters[200] = 1;
Letters[201] = 1;
Letters[202] = 1;
Letters[203] = 1;
Letters[204] = 1;
Letters[205] = 1;
Letters[206] = 1;
Letters[207] = 1;
Letters[208] = 1;
Letters[209] = 1;
Letters[210] = 1;
Letters[211] = 1;
Letters[212] = 1;
Letters[213] = 1;
Letters[214] = 1;
Letters[215] = 1;
Letters[216] = 1;
Letters[217] = 1;
Letters[218] = 1;
Letters[219] = 1;
Letters[220] = 1;
Letters[221] = 1;
Letters[222] = 1;
Letters[223] = 1;
Letters[224] = 1;
Letters[225] = 1;
Letters[226] = 1;
Letters[227] = 1;
Letters[228] = 1;
Letters[229] = 1;
Letters[230] = 1;
Letters[231] = 1;
Letters[232] = 1;
Letters[233] = 1;
Letters[234] = 1;
Letters[235] = 1;
Letters[236] = 1;
Letters[237] = 1;
Letters[238] = 1;
Letters[239] = 1;
Letters[240] = 1;
Letters[241] = 1;
Letters[242] = 1;
Letters[243] = 1;
Letters[244] = 1;
Letters[245] = 1;
Letters[246] = 1;
Letters[247] = 1;
Letters[248] = 1;
Letters[249] = 1;
Letters[250] = 1;
Letters[251] = 1;
Letters[252] = 1;
Letters[253] = 1;
Letters[254] = 1;
Letters[255] = 1;
}
// Build a Huffman tree from the letter count frequencies
var NodeLetter = new Array(512);
var NodeCount = new Array(512);
var NodeChild1 = new Array(512);
var NodeChild2 = new Array(512);
NextParent = 0;
for (i = 0; i < 256; i ++) {
if (Letters[i] > 0) {
NodeLetter[NextParent] = i;
NodeCount[NextParent] = Letters[i];
NodeChild1[NextParent] = -1;
NodeChild2[NextParent] = -1;
NextParent ++;
}
}
// Built node list. Now combine nodes to make a tree
SmallestNode2 = 1;
while (SmallestNode2 != -1) {
SmallestNode1 = -1;
SmallestNode2 = -1;
for (i = 0; i < NextParent; i ++) {
if (NodeCount[i] > 0) {
if (SmallestNode1 == -1) {
SmallestNode1 = i;
} else if (SmallestNode2 == -1) {
if (NodeCount[i] < NodeCount[SmallestNode1]) {
SmallestNode2 = SmallestNode1;
SmallestNode1 = i;
} else {
SmallestNode2 = i;
}
} else if (NodeCount[i] <= NodeCount[SmallestNode1]) {
SmallestNode2 = SmallestNode1;
SmallestNode1 = i;
}
}
}
if (SmallestNode2 != -1) {
NodeCount[NextParent] = NodeCount[SmallestNode1] + NodeCount[SmallestNode2];
NodeCount[SmallestNode1] = 0;
NodeCount[SmallestNode2] = 0;
// Reversed SmallestNode numbers here for ordering in the tree
NodeChild1[NextParent] = SmallestNode2;
NodeChild2[NextParent] = SmallestNode1;
NextParent ++;
}
}
// We have constructed the nodes. Now rewrite the list into a single array.
// The value of an array element will be positive if it is the character
// code we want. Otherwise, it branches. The left branch will be the next
// array element. The value of the array will be (offset * -1), which is
// the right branch.
var FinalNodes = Array(NextParent);
var DepthIndex = Array(256);
Depth = 0;
NextFinal = 0;
DepthIndex[Depth] = SmallestNode1;
while (Depth >= 0) {
if (NodeChild1[DepthIndex[Depth]] > -1 && NodeChild2[DepthIndex[Depth]] > -1) {
// If there is a left and right, push them on the stack
idx = NodeChild1[DepthIndex[Depth]];
NodeChild1[DepthIndex[Depth]] = -2 - NextFinal;
Depth ++;
DepthIndex[Depth] = idx;
NextFinal ++;
} else if (NodeChild1[DepthIndex[Depth]] < 0 && NodeChild2[DepthIndex[Depth]] > -1) {
// If there is a left and a right, but the left was taken,
// push the right on the stack.
// Update the FinalNodes[] with the location for the right branch.
idx = NodeChild1[DepthIndex[Depth]];
idx = 0 - idx;
idx -= 2;
FinalNodes[idx] = - NextFinal;
// Traverse right branch
idx = NodeChild2[DepthIndex[Depth]];
NodeChild2[DepthIndex[Depth]] = -2;
Depth ++;
DepthIndex[Depth] = idx;
} else if (NodeChild1[DepthIndex[Depth]] < -1 && NodeChild2[DepthIndex[Depth]] < -1) {
// If there was a left and a right, but they were both taken, pop up a level
Depth --;
} else if (NodeChild1[DepthIndex[Depth]] == -1 && NodeChild2[DepthIndex[Depth]] == -1) {
// If we have a child here, add it to the final nodes, pop up
FinalNodes[NextFinal] = NodeLetter[DepthIndex[Depth]];
NextFinal ++;
Depth --;
} else {
// This shouldn't ever happen
alert('Bad algorithm!');
return new Array ("", "", "");
}
}
// We have the tree. Associate codes with the letters.
var CodeIndex = new Array(256);
DepthIndex[0] = 0;
CodeIndex[0] = "";
Depth = 0;
while (Depth >= 0) {
if (FinalNodes[DepthIndex[Depth]] < 0) {
c = CodeIndex[Depth];
idx = DepthIndex[Depth];
DepthIndex[Depth + 1] = DepthIndex[Depth] + 1;
CodeIndex[Depth + 1] = c + '0';
DepthIndex[Depth] = 0 - FinalNodes[idx];
CodeIndex[Depth] = c + '1';
Depth ++;
} else {
LetterCodes[FinalNodes[DepthIndex[Depth]]] = CodeIndex[Depth];
Depth --;
}
}
if (USE_PRESET_LETTER_CODES) {
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);
encodedNodes = "";
for (i = 0; i < FinalNodes.length; i ++) {
var x, y;
x = FinalNodes[i] + 512;
y = x & 0x3F;
x >>= 6;
x &= 0x3F;
encodedNodes += encodingCharSet.charAt(x) + encodingCharSet.charAt(y);
}
bytes += encodingCharSet.charAt(encodingVersion);
return new Array (bytes, encodedNodes, LetterCodes);
}
function DecodePGN(bytes, encodedNodes) {
if (bytes.charAt(bytes.length - 1) != encodingCharSet.charAt(encodingVersion)) {
alert("ERROR: PGN encoding version mismatch (e:" +
bytes.charAt(bytes.length - 1) + " d:" + encodingCharSet.charAt(encodingVersion) + ")");
} else {
bytes.length--;
}
originalLength = parseInt(bytes.match(/^[0-9]*/), 10);
bytes = bytes.replace(/^[0-9]*\$/,"");
l = new Array();
while(encodedNodes.length) {
l.push((encodingCharSet.indexOf(encodedNodes.charAt(0))<<6)+encodingCharSet.indexOf(encodedNodes.charAt(1))-512);
encodedNodes = encodedNodes.slice(2,encodedNodes.length);
}
if (USE_PRESET_DECODING_SET) {
l[0] = -146;
l[1] = -111;
l[2] = -66;
l[3] = -55;
l[4] = -6;
l[5] = 46;
l[6] = -8;
l[7] = 66;
l[8] = -10;
l[9] = 105;
l[10] = -12;
l[11] = 107;
l[12] = -14;
l[13] = 44;
l[14] = -16;
l[15] = 85;
l[16] = -18;
l[17] = 106;
l[18] = -20;
l[19] = 62;
l[20] = -22;
l[21] = 89;
l[22] = -24;
l[23] = 38;
l[24] = -40;
l[25] = -33;
l[26] = -30;
l[27] = -29;
l[28] = 17;
l[29] = 18;
l[30] = -32;
l[31] = 15;
l[32] = 16;
l[33] = -37;
l[34] = -36;
l[35] = 21;
l[36] = 22;
l[37] = -39;
l[38] = 19;
l[39] = 20;
l[40] = -48;
l[41] = -45;
l[42] = -44;
l[43] = 7;
l[44] = 8;
l[45] = -47;
l[46] = 5;
l[47] = 6;
l[48] = -52;
l[49] = -51;
l[50] = 12;
l[51] = 14;
l[52] = -54;
l[53] = 9;
l[54] = 11;
l[55] = -57;
l[56] = 34;
l[57] = -59;
l[58] = 78;
l[59] = -61;
l[60] = 57;
l[61] = -63;
l[62] = 63;
l[63] = -65;
l[64] = 109;
l[65] = 119;
l[66] = -80;
l[67] = -69;
l[68] = 101;
l[69] = -71;
l[70] = 55;
l[71] = -73;
l[72] = 69;
l[73] = -75;
l[74] = 118;
l[75] = -77;
l[76] = 121;
l[77] = -79;
l[78] = 73;
l[79] = 123;
l[80] = -82;
l[81] = 49;
l[82] = -86;
l[83] = -85;
l[84] = 13;
l[85] = 40;
l[86] = -88;
l[87] = 45;
l[88] = -90;
l[89] = 68;
l[90] = -92;
l[91] = 84;
l[92] = -94;
l[93] = 125;
l[94] = -96;
l[95] = 39;
l[96] = -98;
l[97] = 58;
l[98] = -100;
l[99] = 36;
l[100] = -102;
l[101] = 92;
l[102] = -104;
l[103] = 124;
l[104] = -108;
l[105] = -107;
l[106] = 3;
l[107] = 4;
l[108] = -110;
l[109] = 0;
l[110] = 2;
l[111] = -129;
l[112] = -118;
l[113] = -115;
l[114] = 50;
l[115] = -117;
l[116] = 102;
l[117] = 103;
l[118] = -122;
l[119] = -121;
l[120] = 48;
l[121] = 110;
l[122] = -126;
l[123] = -125;
l[124] = 10;
l[125] = 1;
l[126] = -128;
l[127] = 79;
l[128] = 117;
l[129] = -137;
l[130] = -132;
l[131] = 51;
l[132] = -134;
l[133] = 98;
l[134] = -136;
l[135] = 47;
l[136] = 112;
l[137] = -141;
l[138] = -140;
l[139] = 56;
l[140] = 81;
l[141] = -143;
l[142] = 104;
l[143] = -145;
l[144] = 114;
l[145] = 115;
l[146] = -192;
l[147] = -153;
l[148] = -150;
l[149] = 32;
l[150] = -152;
l[151] = 91;
l[152] = 93;
l[153] = -157;
l[154] = -156;
l[155] = 99;
l[156] = 120;
l[157] = -159;
l[158] = 116;
l[159] = -161;
l[160] = 75;
l[161] = -163;
l[162] = 80;
l[163] = -165;
l[164] = 67;
l[165] = -167;
l[166] = 77;
l[167] = -169;
l[168] = 90;
l[169] = -171;
l[170] = 60;
l[171] = -173;
l[172] = 33;
l[173] = -175;
l[174] = 37;
l[175] = -177;
l[176] = 96;
l[177] = -185;
l[178] = -182;
l[179] = -181;
l[180] = 248;
l[181] = 249;
l[182] = -184;
l[183] = 246;
l[184] = 247;
l[185] = -189;
l[186] = -188;
l[187] = 252;
l[188] = 253;
l[189] = -191;
l[190] = 250;
l[191] = 251;
l[192] = -228;
l[193] = -225;
l[194] = -196;
l[195] = 52;
l[196] = -198;
l[197] = 108;
l[198] = -208;
l[199] = -201;
l[200] = 83;
l[201] = -205;
l[202] = -204;
l[203] = 61;
l[204] = 72;
l[205] = -207;
l[206] = 113;
l[207] = 122;
l[208] = -212;
l[209] = -211;
l[210] = 65;
l[211] = 70;
l[212] = -214;
l[213] = 71;
l[214] = -216;
l[215] = 76;
l[216] = -218;
l[217] = 74;
l[218] = -220;
l[219] = 88;
l[220] = -222;
l[221] = 64;
l[222] = -224;
l[223] = 42;
l[224] = 94;
l[225] = -227;
l[226] = 53;
l[227] = 100;
l[228] = -232;
l[229] = -231;
l[230] = 54;
l[231] = 82;
l[232] = -234;
l[233] = 97;
l[234] = -236;
l[235] = 111;
l[236] = -238;
l[237] = 43;
l[238] = -240;
l[239] = 87;
l[240] = -242;
l[241] = 41;
l[242] = -244;
l[243] = 86;
l[244] = -246;
l[245] = 35;
l[246] = -256;
l[247] = -249;
l[248] = 59;
l[249] = -251;
l[250] = 95;
l[251] = -253;
l[252] = 126;
l[253] = -255;