// ==UserScript==// @name         bv7_jpeg_encoder// @namespace    bv7// @version      0.1// @description  array -> jpeg// @author       bv7// ==/UserScript==class JpegEncoder {constructor() {this.zigZag = [0x00, 0x01, 0x05, 0x06, 0x0E, 0x0F, 0x1B, 0x1C,0x02, 0x04, 0x07, 0x0D, 0x10, 0x1A, 0x1D, 0x2A,0x03, 0x08, 0x0C, 0x11, 0x19, 0x1E, 0x29, 0x2B,0x09, 0x0B, 0x12, 0x18, 0x1F, 0x28, 0x2C, 0x35,0x0A, 0x13, 0x17, 0x20, 0x27, 0x2D, 0x34, 0x36,0x14, 0x16, 0x21, 0x26, 0x2E, 0x33, 0x37, 0x3C,0x15, 0x22, 0x25, 0x2F, 0x32, 0x38, 0x3B, 0x3D,0x23, 0x24, 0x30, 0x31, 0x39, 0x3A, 0x3E, 0x3F];this.std_dc_luminance_nrcodes = [0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];this.std_dc_luminance_values  = [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08, 0x09, 0x0A, 0x0B];this.std_ac_luminance_nrcodes = [0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D];this.std_ac_luminance_values  = [0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08,0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16,0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,0xF9, 0xFA];this.std_dc_chrominance_nrcodes = [0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00];this.std_dc_chrominance_values = [0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08, 0x09, 0x0A, 0x0B];this.std_ac_chrominance_nrcodes = [0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77];this.std_ac_chrominance_values = [0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34,0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38,0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4,0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,0xF9, 0xFA];this.YDC_HT          = new Uint8Array(0x0B);this.UVDC_HT         = new Uint8Array(0x0B);this.YAC_HT          = new  Int8Array(0xFA);this.UVAC_HT         = new  Int8Array(0xFA);this.YDC_HT2         = new Uint8Array(0x0B);this.UVDC_HT2        = new Uint8Array(0x0B);this.YAC_HT2         = new Uint8Array(0xFA);this.UVAC_HT2        = new Uint8Array(0xFA);this.YTable          = new  Uint8Array(0x40  );this.UVTable         = new  Uint8Array(0x40  );this.fdtbl_Y         = [];this.fdtbl_UV        = new Float32Array(0x08);this.outputfDCTQuant = new Uint16Array(0x40  );this.DU              = new  Int16Array(0x40  );this.category        = new  Uint8Array(0xFFFE);this.bitcode         = new Uint16Array(0xFFFE);this.RGB_YUV_TABLE   = new Uint32Array(0x0800);this.YDU             = new  Int16Array(0x40  );this.UDU             = new  Int16Array(0x40  );this.VDU             = new  Int16Array(0x40  );this.initHuffmanTbl();this.initCategoryNumber();this.initRGBYUVTable();}// IO functionswriteBits(value, posval) {while (posval >= 0) {if (value & (1 << posval)) this.bytenew |= (1 << this.bytepos);posval--;this.bytepos--;if (this.bytepos < 0) {this.writeByte(this.bytenew);if (this.bytenew == 0xFF) this.writeByte(0x00);this.bytepos = 7;this.bytenew = 0;}}}writeByte(value) {this.byteout.push(String.fromCharCode(value)); // write char directly instead of converting later}writeWord(value) {this.writeByte((value >> 8) & 0xFF);this.writeByte((value     ) & 0xFF);}writeAPP0() {this.writeWord(0xFFE0); // markerthis.writeWord(0x0010); // lengththis.writeByte(0x4A  ); // Jthis.writeByte(0x46  ); // Fthis.writeByte(0x49  ); // Ithis.writeByte(0x46  ); // Fthis.writeByte(0x00  ); // = "JFIF",'\0'this.writeByte(0x01  ); // versionhithis.writeByte(0x01  ); // versionlothis.writeByte(0x00  ); // xyunitsthis.writeWord(0x0001); // xdensitythis.writeWord(0x0001); // ydensitythis.writeByte(0x00  ); // thumbnwidththis.writeByte(0x00  ); // thumbnheight}writeDQT() {this.writeWord(0xFFDB); // markerthis.writeWord(0x0084); // lengththis.writeByte(0x00  );this.YTable.forEach((v) => this.writeByte(v));this.writeByte(0x01  );this.UVTable.forEach((v) => this.writeByte(v));}writeSOF0(width, height) {this.writeWord(0xFFC0); // markerthis.writeWord(0x0011); // length, truecolor YUV JPGthis.writeByte(0x08  ); // precisionthis.writeWord(height);this.writeWord(width );this.writeByte(0x03  ); // nrofcomponentsthis.writeByte(0x01  ); // IdYthis.writeByte(0x11  ); // HVYthis.writeByte(0x00  ); // QTYthis.writeByte(0x02  ); // IdUthis.writeByte(0x11  ); // HVUthis.writeByte(0x01  ); // QTUthis.writeByte(0x03  ); // IdVthis.writeByte(0x11  ); // HVVthis.writeByte(0x01  ); // QTV}writeDHT() {this.writeWord(0xFFC4); // markerthis.writeWord(0x01A2); // lengththis.writeByte(0x00  ); // HTYDCinfothis.std_dc_luminance_nrcodes.forEach((v) => this.writeByte(v));this.std_dc_luminance_values.forEach((v) => this.writeByte(v));this.writeByte(0x10  ); // HTYACinfothis.std_ac_luminance_nrcodes.forEach((v) => this.writeByte(v));this.std_ac_luminance_values.forEach((v) => this.writeByte(v));this.writeByte(0x01  ); // HTUDCinfothis.std_dc_chrominance_nrcodes.forEach((v) => this.writeByte(v));this.std_dc_chrominance_values.forEach((v) => this.writeByte(v));this.writeByte(0x11  ); // HTUACinfothis.std_ac_chrominance_nrcodes.forEach((v) => this.writeByte(v));this.std_ac_chrominance_values.forEach((v) => this.writeByte(v));}writeSOS() {this.writeWord(0xFFDA); // markerthis.writeWord(0x000C); // lengththis.writeByte(0x03  ); // nrofcomponentsthis.writeByte(0x01  ); // IdYthis.writeByte(0x00  ); // HTYthis.writeByte(0x02  ); // IdUthis.writeByte(0x11  ); // HTUthis.writeByte(0x03  ); // IdVthis.writeByte(0x11  ); // HTVthis.writeByte(0x00  ); // Ssthis.writeByte(0x3F  ); // Sethis.writeByte(0x00  ); // Bf}computeHuffmanTbl(nrcodes, std_table, HT, HT2) {let a, j;let codevalue    = 0;let pos_in_table = 0;nrcodes.forEach((nrcodesK, k) => {for (j = 0; j < nrcodesK; j++) {HT[a = std_table[pos_in_table++]] = codevalue++;HT2[a                           ] = k;}codevalue *= 2;});}initHuffmanTbl() {this.computeHuffmanTbl(this.std_dc_luminance_nrcodes  , this.std_dc_luminance_values  , this.YDC_HT , this.YDC_HT2 );this.computeHuffmanTbl(this.std_dc_chrominance_nrcodes, this.std_dc_chrominance_values, this.UVDC_HT, this.UVDC_HT2);this.computeHuffmanTbl(this.std_ac_luminance_nrcodes  , this.std_ac_luminance_values  , this.YAC_HT , this.YAC_HT2 );this.computeHuffmanTbl(this.std_ac_chrominance_nrcodes, this.std_ac_chrominance_values, this.UVAC_HT, this.UVAC_HT2);}initCategoryNumber() {let cat, nr, nrlower, nrupper, nrn;for (cat = 0, nrlower = 1, nrupper = 2; cat < 15; cat++, nrlower = nrupper, nrupper <<= 1) {for (nr = nrlower, nrn = nrlower - 1; nr < nrupper; nr++, nrn--) { //Positive & Negative numbersthis.category[0x7FFF + nr] = this.category[0x7FFF - nr] = cat;this.bitcode[ 0x7FFF + nr] = nr;this.bitcode[ 0x7FFF - nr] = nrn;}}}initRGBYUVTable() {for(let i = 0x0000; i < 0x0100; i++) {this.RGB_YUV_TABLE[i         ] =   0x004C8B * i           ;this.RGB_YUV_TABLE[i + 0x0100] =   0x009646 * i           ;this.RGB_YUV_TABLE[i + 0x0200] =   0x001D2F * i + 0x008000;this.RGB_YUV_TABLE[i + 0x0300] = - 0x002B33 * i           ;this.RGB_YUV_TABLE[i + 0x0400] = - 0x0054CD * i           ;this.RGB_YUV_TABLE[i + 0x0500] =   0x008000 * i + 0x807FFF;this.RGB_YUV_TABLE[i + 0x0600] = - 0x006B2F * i           ;this.RGB_YUV_TABLE[i + 0x0700] = - 0x0014D1 * i           ;}}initQuantTables(sf) {let i, t;let row;let col;[0x10, 0x0B, 0x0A, 0x10, 0x18, 0x28, 0x33, 0x3D,0x0C, 0x0C, 0x0E, 0x13, 0x1A, 0x3A, 0x3C, 0x37,0x0E, 0x0D, 0x10, 0x18, 0x28, 0x39, 0x45, 0x38,0x0E, 0x11, 0x16, 0x1D, 0x33, 0x57, 0x50, 0x3E,0x12, 0x16, 0x25, 0x38, 0x44, 0x6D, 0x67, 0x4D,0x18, 0x23, 0x37, 0x40, 0x51, 0x68, 0x71, 0x5C,0x31, 0x40, 0x4E, 0x57, 0x67, 0x79, 0x78, 0x65,0x48, 0x5C, 0x5F, 0x62, 0x70, 0x64, 0x67, 0x63].forEach((v, i) => this.YTable[this.zigZag[i]] = (t = 0 | ((v * sf + 50) / 100)) < 1 ? 1 : t > 0xFF ? 0xFF : t);[0x11, 0x12, 0x18, 0x2F, 0x63, 0x63, 0x63, 0x63,0x12, 0x15, 0x1A, 0x42, 0x63, 0x63, 0x63, 0x63,0x18, 0x1A, 0x38, 0x63, 0x63, 0x63, 0x63, 0x63,0x2F, 0x42, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63].forEach((v, i) => this.UVTable[this.zigZag[i]] = (t = 0 | ((v * sf + 50) / 100)) < 1 ? 1 : t > 0xFF ? 0xFF : t);let aasf = [1.0, 1.387039845, 1.306562965, 1.175875602,1.0, 0.785694958, 0.541196100, 0.275899379];for (i = 0, row = 0; row < 8; row++) for (col = 0; col < 8; col++, i++) {this.fdtbl_Y[i]  = 1.0 / (this.YTable [this.zigZag[i]] * aasf[row] * aasf[col] * 8.0);this.fdtbl_UV[i] = 1.0 / (this.UVTable[this.zigZag[i]] * aasf[row] * aasf[col] * 8.0);}}fDCTQuant(data, fdtbl) { // DCT & quantization corelet d0, d1, d2, d3, d4, d5, d6, d7;let t0, t1, t2, t3, t4, t5, t6, t7;// Pass 1: process rows.let i, p;for (i = p = 0; i < 8; ++i, p += 8) { // advance pointer to next rowd0 = data[p    ];d1 = data[p + 1];d2 = data[p + 2];d3 = data[p + 3];d4 = data[p + 4];d5 = data[p + 5];d6 = data[p + 6];d7 = data[p + 7];t0 = d0 + d7;t7 = d0 - d7;t1 = d1 + d6;t6 = d1 - d6;t2 = d2 + d5;t5 = d2 - d5;t3 = d3 + d4;t4 = d3 - d4;// Even partd0          = t0 + t3;    // phase 2d1          = t1 + t2;d2          = t1 - t2;d3          = t0 - t3;data[p    ] = d0 + d1;    // phase 3data[p + 4] = d0 - d1;d0          = (d2 + d3) * 0.707106781; // c4data[p + 2] = d3 + d0;    // phase 5data[p + 6] = d3 - d0;// Odd partd0 = t4 + t5;             // phase 2d1 = t5 + t6;d2 = t6 + t7;// The rotator is modified from fig 4-8 to avoid extra negations.d3          = 0.382683433 * (d0 - d2); // c6t2          = 0.541196100 * d0 + d3;   // c2-c6t4          = 1.306562965 * d2 + d3;   // c2+c6t3          = 0.707106781 * d1     ;   // c4d1          = t7 + t3;    // phase 5d3          = t7 - t3;data[p + 1] = d1 + t4;    // phase 6data[p + 3] = d3 - t2;data[p + 5] = d3 + t2;data[p + 7] = d1 - t4;}// Pass 2: process columns.for (i = p = 0; i < 8; ++i, p++) { // advance pointer to next columnd0 = data[p       ];d1 = data[p + 0x08];d2 = data[p + 0x10];d3 = data[p + 0x18];d4 = data[p + 0x20];d5 = data[p + 0x28];d6 = data[p + 0x30];d7 = data[p + 0x38];t0 = d0 + d7;t1 = d1 + d6;t2 = d2 + d5;t3 = d3 + d4;t4 = d3 - d4;t5 = d2 - d5;t6 = d1 - d6;t7 = d0 - d7;// Even partd0             = t0 + t3; // phase 2d1             = t1 + t2;d2             = t1 - t2;d3             = t0 - t3;data[p       ] = d0 + d1; // phase 3data[p + 0x20] = d0 - d1;d0             = (d2 + d3) * 0.707106781; // c4data[p + 0x10] = d3 + d0; // phase 5data[p + 0x30] = d3 - d0;// Odd partd0 = t4 + t5;             // phase 2d1 = t5 + t6;d2 = t6 + t7;// The rotator is modified from fig 4-8 to avoid extra negations.d3             = 0.382683433 * (d0 - d2); // c6t2             = 0.541196100 * d0 + d3;   // c2-c6t4             = 1.306562965 * d2 + d3;   // c2+c6t3             = 0.707106781 * d1;        // c4d1             = t7 + t3; // phase 5d3             = t7 - t3;data[p + 0x08] = d1 + t4; // phase 6data[p + 0x18] = d3 - t2;data[p + 0x28] = d3 + t2;data[p + 0x38] = d1 - t4;}// Quantize/descale the coefficients// Apply the quantization and scaling factor & Round to nearest integerfor (i = 0; i < 64; ++i) this.outputfDCTQuant[i] = ((d0 = data[i] * fdtbl[i]) > 0.0) ? ((d0 + 0.5)|0) : ((d0 - 0.5)|0); //outputfDCTQuant[i] = fround(d0);return this.outputfDCTQuant;}processDU(CDU, fdtbl, DC, HTDC, HTAC, HTDC2, HTAC2) {let pos, i, a;let EOB        = HTAC[0x00];let EOB2       = HTAC2[0x00];let M16zeroes  = HTAC[0xF0];let M16zeroes2 = HTAC2[0xF0];let DU_DCT     = this.fDCTQuant(CDU, fdtbl);//ZigZag reorderfor (i = 0; i < 64; ++i) this.DU[this.zigZag[i]] = DU_DCT[i];let Diff = this.DU[0] - DC;DC = this.DU[0];//Encode DCif (Diff == 0) this.writeBits(HTDC[0], HTDC2[0]); // Diff might be 0else {pos = 0x7FFF + Diff;this.writeBits(HTDC[a = this.category[pos] + 1], HTDC2[a]);this.writeBits(this.bitcode[pos], this.category[pos]);}//Encode ACslet end0pos = 0x3F; // was const... which is crazywhile (end0pos > 0 && this.DU[end0pos] == 0) end0pos--;if (end0pos == 0) this.writeBits(EOB, EOB2); //end0pos = first element in reverse order !=0else {let lng, startpos, nrzeroes, nrmarker;end0pos++;for (i = 1; i < end0pos; i++) {startpos = i;while (this.DU[i] == 0 && i < end0pos) ++i;nrzeroes = i - startpos;if (nrzeroes > 0x0F) {lng = nrzeroes >> 4;for (nrmarker = 0; nrmarker < lng; ++nrmarker) this.writeBits(M16zeroes, M16zeroes2);nrzeroes = nrzeroes & 0x0F;}this.writeBits(HTAC[a = (nrzeroes << 4) + this.category[pos = 0x7FFF + this.DU[i]] + 1], HTAC2[a]);this.writeBits(this.bitcode[pos], this.category[pos]);}if (end0pos != 0x40) this.writeBits(EOB, EOB2);}return DC;}encode(imageData, quality = 0.92) { // image data objectthis.byteout = []; // Initialize bit writerthis.bytenew = 0;this.bytepos = 7;let newSf = Math.floor(quality < 0.5 ? 50 / quality : 200 * (1 - quality));if ((typeof this.sf) == 'undefined' || newSf !== this.sf) this.initQuantTables(this.sf = newSf);// Add JPEG headersthis.writeWord(0xFFD8); // SOIthis.writeAPP0();this.writeDQT();this.writeSOF0(imageData.width, imageData.height);this.writeDHT();this.writeSOS();let y1, y2, y3, pY3, pY1;let x1, x2, x3, pX3, pX1;let r, g, b;let pos;let quadWidth = imageData.width *  4;let width32   = imageData.width * 32;// Encode 8x8 macroblockslet DCY = 0;let DCU = 0;let DCV = 0;for (y1 = 0, pY1 = 0; y1 < imageData.height; y1 += 8, pY1 += width32) {for (x1 = 0, pX1 = pY1; x1 < imageData.width; x1 += 8, pX1 += 32) {for (y2 = pos = 0, y3 = y1, pY3 = pX1; y2 < 8; y2++, y3++, pY3 += quadWidth) {for (x2 = 0, x3 = x1, pX3 = pY3; x2 < 8; x2++, x3++, pos++) {if (y3 < imageData.height && x3 < imageData.width) {r = imageData.data[pX3++];g = imageData.data[pX3++];b = imageData.data[pX3++];pX3++;} else r = g = b = 0; // paddingthis.YDU[pos] = ((this.RGB_YUV_TABLE[r         ] + this.RGB_YUV_TABLE[g + 0x0100] + this.RGB_YUV_TABLE[b + 0x0200]) >> 16) - 0x80;this.UDU[pos] = ((this.RGB_YUV_TABLE[r + 0x0300] + this.RGB_YUV_TABLE[g + 0x0400] + this.RGB_YUV_TABLE[b + 0x0500]) >> 16) - 0x80;this.VDU[pos] = ((this.RGB_YUV_TABLE[r + 0x0500] + this.RGB_YUV_TABLE[g + 0x0600] + this.RGB_YUV_TABLE[b + 0x0700]) >> 16) - 0x80;}}DCY = this.processDU(this.YDU, this.fdtbl_Y , DCY,  this.YDC_HT,  this.YAC_HT,  this.YDC_HT2,  this.YAC_HT2);DCU = this.processDU(this.UDU, this.fdtbl_UV, DCU, this.UVDC_HT, this.UVAC_HT, this.UVDC_HT2, this.UVAC_HT2);DCV = this.processDU(this.VDU, this.fdtbl_UV, DCV, this.UVDC_HT, this.UVAC_HT, this.UVDC_HT2, this.UVAC_HT2);}}////////////////////////////////////////////////////////////////// Do the bit alignment of the EOI markerif (this.bytepos >= 0) this.writeBits((1 << (this.bytepos + 1)) - 1, this.bytepos);this.writeWord(0xFFD9); //EOIlet res = 'data:image/jpeg;base64,' + btoa(this.byteout.join(''));this.byteout = [];return res;}}