318 lines
12 KiB
PHP
318 lines
12 KiB
PHP
<?php
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/*
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* pgn4web javascript chessboard
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* copyright (C) 2009-2012 Paolo Casaschi
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* see README file and http://pgn4web.casaschi.net
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* for credits, license and more details
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*
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* Huffman encoding/decoding derived from code at http://rumkin.com/tools/compression/compress_huff.php
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*/
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function BitsToBytes($i) {
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global $encodingCharSet, $encodingVersion;
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$o = 0;
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if (substr($i, 0, 1) == '1') { $o += 32; }
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if (substr($i, 1, 1) == '1') { $o += 16; }
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if (substr($i, 2, 1) == '1') { $o += 8; }
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if (substr($i, 3, 1) == '1') { $o += 4; }
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if (substr($i, 4, 1) == '1') { $o += 2; }
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if (substr($i, 5, 1) == '1') { $o += 1; }
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return substr($encodingCharSet, $o, 1);
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}
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function EncodePGN($ov) {
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global $encodingCharSet, $encodingVersion;
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$encodingCharSet = "$0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
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$encodingVersion = 1;
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/*
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* version 1 of PGN encoding:
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* encodedPGN = nnn$xxx0
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* nnn = number representing bytes length of the decoded message
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* $ = dollar char (delimiter for length info)
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* xxx = encoded text (using $LetterCodes below)
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* 0 = zero char (version marker)
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*/
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$LetterCodes[0] = '00111111111111110';
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$LetterCodes[1] = '0101101';
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$LetterCodes[2] = '00111111111111111';
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$LetterCodes[3] = '00111111111111100';
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$LetterCodes[4] = '00111111111111101';
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$LetterCodes[5] = '000011111111111010';
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$LetterCodes[6] = '000011111111111011';
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$LetterCodes[7] = '000011111111111000';
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$LetterCodes[8] = '000011111111111001';
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$LetterCodes[9] = '000011111111111110';
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$LetterCodes[10] = '0101100';
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$LetterCodes[11] = '000011111111111111';
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$LetterCodes[12] = '000011111111111100';
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$LetterCodes[13] = '0011100';
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$LetterCodes[14] = '000011111111111101';
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$LetterCodes[15] = '000011111111110010';
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$LetterCodes[16] = '000011111111110011';
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$LetterCodes[17] = '000011111111110000';
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$LetterCodes[18] = '000011111111110001';
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$LetterCodes[19] = '000011111111110110';
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$LetterCodes[20] = '000011111111110111';
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$LetterCodes[21] = '000011111111110100';
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$LetterCodes[22] = '000011111111110101';
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$LetterCodes[23] = '1111111111110101010';
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$LetterCodes[24] = '1111111111110101011';
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$LetterCodes[25] = '1111111111110101000';
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$LetterCodes[26] = '1111111111110101001';
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$LetterCodes[27] = '1111111111110101110';
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$LetterCodes[28] = '1111111111110101111';
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$LetterCodes[29] = '1111111111110101100';
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$LetterCodes[30] = '1111111111110101101';
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$LetterCodes[31] = '1111111111110100010';
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$LetterCodes[32] = '1000';
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$LetterCodes[33] = '101111111110';
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$LetterCodes[34] = '00010';
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$LetterCodes[35] = '11111111110';
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$LetterCodes[36] = '0011111111110';
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$LetterCodes[37] = '1011111111110';
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$LetterCodes[38] = '00001111111110';
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$LetterCodes[39] = '00111111110';
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$LetterCodes[40] = '0011101';
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$LetterCodes[41] = '111111110';
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$LetterCodes[42] = '11001111111110';
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$LetterCodes[43] = '1111110';
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$LetterCodes[44] = '000011110';
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$LetterCodes[45] = '0011110';
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$LetterCodes[46] = '00000';
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$LetterCodes[47] = '0110110';
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$LetterCodes[48] = '010100';
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$LetterCodes[49] = '00110';
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$LetterCodes[50] = '01000';
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$LetterCodes[51] = '01100';
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$LetterCodes[52] = '11000';
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$LetterCodes[53] = '11010';
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$LetterCodes[54] = '11100';
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$LetterCodes[55] = '001010';
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$LetterCodes[56] = '011100';
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$LetterCodes[57] = '0001110';
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$LetterCodes[58] = '001111111110';
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$LetterCodes[59] = '1111111111100';
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$LetterCodes[60] = '10111111110';
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$LetterCodes[61] = '1100110100';
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$LetterCodes[62] = '000011111110';
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$LetterCodes[63] = '00011110';
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$LetterCodes[64] = '1100111111110';
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$LetterCodes[65] = '110011100';
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$LetterCodes[66] = '000010';
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$LetterCodes[67] = '10111110';
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$LetterCodes[68] = '00111110';
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$LetterCodes[69] = '0010110';
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$LetterCodes[70] = '110011101';
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$LetterCodes[71] = '110011110';
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$LetterCodes[72] = '1100110101';
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$LetterCodes[73] = '0010111110';
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$LetterCodes[74] = '11001111110';
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$LetterCodes[75] = '101110';
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$LetterCodes[76] = '1100111110';
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$LetterCodes[77] = '101111110';
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$LetterCodes[78] = '000110';
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$LetterCodes[79] = '0101110';
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$LetterCodes[80] = '1011110';
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$LetterCodes[81] = '011101';
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$LetterCodes[82] = '11101';
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$LetterCodes[83] = '11001100';
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$LetterCodes[84] = '001111110';
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$LetterCodes[85] = '0000111110';
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$LetterCodes[86] = '1111111110';
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$LetterCodes[87] = '11111110';
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$LetterCodes[88] = '110011111110';
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$LetterCodes[89] = '0000111111110';
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$LetterCodes[90] = '1011111110';
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$LetterCodes[91] = '10010';
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$LetterCodes[92] = '00111111111110';
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$LetterCodes[93] = '10011';
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$LetterCodes[94] = '11001111111111';
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$LetterCodes[95] = '11111111111010';
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$LetterCodes[96] = '10111111111110';
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$LetterCodes[97] = '11110';
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$LetterCodes[98] = '011010';
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$LetterCodes[99] = '10100';
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$LetterCodes[100] = '11011';
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$LetterCodes[101] = '00100';
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$LetterCodes[102] = '010010';
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$LetterCodes[103] = '010011';
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$LetterCodes[104] = '011110';
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$LetterCodes[105] = '0000110';
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$LetterCodes[106] = '00001111110';
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$LetterCodes[107] = '00001110';
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$LetterCodes[108] = '110010';
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$LetterCodes[109] = '000111110';
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$LetterCodes[110] = '010101';
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$LetterCodes[111] = '111110';
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$LetterCodes[112] = '0110111';
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$LetterCodes[113] = '1100110110';
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$LetterCodes[114] = '0111110';
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$LetterCodes[115] = '0111111';
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$LetterCodes[116] = '10110';
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$LetterCodes[117] = '0101111';
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$LetterCodes[118] = '00101110';
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$LetterCodes[119] = '000111111';
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$LetterCodes[120] = '10101';
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$LetterCodes[121] = '001011110';
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$LetterCodes[122] = '1100110111';
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$LetterCodes[123] = '0010111111';
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$LetterCodes[124] = '001111111111110';
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$LetterCodes[125] = '0011111110';
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$LetterCodes[126] = '111111111110110';
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$LetterCodes[127] = '1111111111110100011';
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$LetterCodes[128] = '1111111111110100000';
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$LetterCodes[129] = '1111111111110100001';
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$LetterCodes[130] = '1111111111110100110';
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$LetterCodes[131] = '1111111111110100111';
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$LetterCodes[132] = '1111111111110100100';
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$LetterCodes[133] = '1111111111110100101';
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$LetterCodes[134] = '1111111111110111010';
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$LetterCodes[135] = '1111111111110111011';
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$LetterCodes[136] = '1111111111110111000';
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$LetterCodes[137] = '1111111111110111001';
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$LetterCodes[138] = '1111111111110111110';
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$LetterCodes[139] = '1111111111110111111';
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$LetterCodes[140] = '1111111111110111100';
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$LetterCodes[141] = '1111111111110111101';
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$LetterCodes[142] = '1111111111110110010';
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$LetterCodes[143] = '1111111111110110011';
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$LetterCodes[144] = '1111111111110110000';
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$LetterCodes[145] = '1111111111110110001';
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$LetterCodes[146] = '1111111111110110110';
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$LetterCodes[147] = '1111111111110110111';
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$LetterCodes[148] = '1111111111110110100';
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$LetterCodes[149] = '1111111111110110101';
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$LetterCodes[150] = '1111111111110001010';
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$LetterCodes[151] = '1111111111110001011';
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$LetterCodes[152] = '1111111111110001000';
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$LetterCodes[153] = '1111111111110001001';
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$LetterCodes[154] = '1111111111110001110';
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$LetterCodes[155] = '1111111111110001111';
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$LetterCodes[156] = '1111111111110001100';
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$LetterCodes[157] = '1111111111110001101';
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$LetterCodes[158] = '1111111111110000010';
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$LetterCodes[159] = '1111111111110000011';
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$LetterCodes[160] = '1111111111110000000';
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$LetterCodes[161] = '1111111111110000001';
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$LetterCodes[162] = '1111111111110000110';
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$LetterCodes[163] = '1111111111110000111';
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$LetterCodes[164] = '1111111111110000100';
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$LetterCodes[165] = '1111111111110000101';
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$LetterCodes[166] = '1111111111110011010';
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$LetterCodes[167] = '1111111111110011011';
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$LetterCodes[168] = '1111111111110011000';
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$LetterCodes[169] = '1111111111110011001';
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$LetterCodes[170] = '1111111111110011110';
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$LetterCodes[171] = '1111111111110011111';
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$LetterCodes[172] = '1111111111110011100';
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$LetterCodes[173] = '1111111111110011101';
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$LetterCodes[174] = '1111111111110010010';
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$LetterCodes[175] = '1111111111110010011';
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$LetterCodes[176] = '1111111111110010000';
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$LetterCodes[177] = '1111111111110010001';
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$LetterCodes[178] = '1111111111110010110';
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$LetterCodes[179] = '1111111111110010111';
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$LetterCodes[180] = '1111111111110010100';
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$LetterCodes[181] = '1111111111110010101';
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$LetterCodes[182] = '1111111111111101010';
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$LetterCodes[183] = '1111111111111101011';
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$LetterCodes[184] = '1111111111111101000';
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$LetterCodes[185] = '1111111111111101001';
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$LetterCodes[186] = '1111111111111101110';
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$LetterCodes[187] = '1111111111111101111';
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$LetterCodes[188] = '1111111111111101100';
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$LetterCodes[189] = '1111111111111101101';
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$LetterCodes[190] = '1111111111111100010';
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$LetterCodes[191] = '1111111111111100011';
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$LetterCodes[192] = '1111111111111100000';
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$LetterCodes[193] = '1111111111111100001';
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$LetterCodes[194] = '1111111111111100110';
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$LetterCodes[195] = '1111111111111100111';
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$LetterCodes[196] = '1111111111111100100';
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$LetterCodes[197] = '1111111111111100101';
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$LetterCodes[198] = '1111111111111111010';
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$LetterCodes[199] = '1111111111111111011';
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$LetterCodes[200] = '1111111111111111000';
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$LetterCodes[201] = '1111111111111111001';
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$LetterCodes[202] = '1111111111111111110';
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$LetterCodes[203] = '1111111111111111111';
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$LetterCodes[204] = '1111111111111111100';
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$LetterCodes[205] = '1111111111111111101';
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$LetterCodes[206] = '1111111111111110010';
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$LetterCodes[207] = '1111111111111110011';
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$LetterCodes[208] = '1111111111111110000';
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$LetterCodes[209] = '1111111111111110001';
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$LetterCodes[210] = '1111111111111110110';
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$LetterCodes[211] = '1111111111111110111';
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$LetterCodes[212] = '1111111111111110100';
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$LetterCodes[213] = '1111111111111110101';
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$LetterCodes[214] = '1111111111111001010';
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$LetterCodes[215] = '1111111111111001011';
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$LetterCodes[216] = '1111111111111001000';
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$LetterCodes[217] = '1111111111111001001';
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$LetterCodes[218] = '1111111111111001110';
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$LetterCodes[219] = '1111111111111001111';
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$LetterCodes[220] = '1111111111111001100';
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$LetterCodes[221] = '1111111111111001101';
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$LetterCodes[222] = '1111111111111000010';
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$LetterCodes[223] = '1111111111111000011';
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$LetterCodes[224] = '1111111111111000000';
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$LetterCodes[225] = '1111111111111000001';
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$LetterCodes[226] = '1111111111111000110';
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$LetterCodes[227] = '1111111111111000111';
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$LetterCodes[228] = '1111111111111000100';
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$LetterCodes[229] = '1111111111111000101';
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$LetterCodes[230] = '1111111111111011010';
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$LetterCodes[231] = '1111111111111011011';
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$LetterCodes[232] = '1111111111111011000';
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$LetterCodes[233] = '1111111111111011001';
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$LetterCodes[234] = '1111111111111011110';
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$LetterCodes[235] = '1111111111111011111';
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$LetterCodes[236] = '1111111111111011100';
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$LetterCodes[237] = '1111111111111011101';
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$LetterCodes[238] = '1111111111111010010';
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$LetterCodes[239] = '1111111111111010011';
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$LetterCodes[240] = '1111111111111010000';
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$LetterCodes[241] = '1111111111111010001';
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$LetterCodes[242] = '1111111111111010110';
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$LetterCodes[243] = '1111111111111010111';
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$LetterCodes[244] = '1111111111111010100';
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$LetterCodes[245] = '1111111111111010101';
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$LetterCodes[246] = '10111111111111010';
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$LetterCodes[247] = '10111111111111011';
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$LetterCodes[248] = '10111111111111000';
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$LetterCodes[249] = '10111111111111001';
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$LetterCodes[250] = '10111111111111110';
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$LetterCodes[251] = '10111111111111111';
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$LetterCodes[252] = '10111111111111100';
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$LetterCodes[253] = '10111111111111101';
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$LetterCodes[254] = '1111111111101110';
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$LetterCodes[255] = '1111111111101111';
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# Build resulting data stream
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# The bits string could get very large
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$bits = "";
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$bytes = strlen($ov) . "$";
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for ($i = 0; $i < strlen($ov); $i++) {
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# converts ASCII chars above 255 to a star (code 42) avoiding decoding failure
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if (ord(substr($ov, $i, 1)) > 255) { $bits = $bits . $LetterCodes[42]; }
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else { $bits = $bits . $LetterCodes[ord(substr($ov, $i, 1))]; }
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while (strlen($bits) > 5) {
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$bytes = $bytes . BitsToBytes($bits);
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$bits = substr($bits, 6);
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}
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}
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$bytes = $bytes . BitsToBytes($bits);
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$bytes = $bytes . substr($encodingCharSet, $encodingVersion, 1);
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return $bytes;
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}
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?>
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