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How to use findNextFileMarker method in wpt

Best JavaScript code snippet using wpt

jpg.js

Source:jpg.js

...350          mcu++;351        }352      }353      bitsCount = 0;354      fileMarker = findNextFileMarker(data, offset);355      if (fileMarker && fileMarker.invalid) {356        (0, _util.warn)('decodeScan - unexpected MCU data, current marker is: ' + fileMarker.invalid);357        offset = fileMarker.offset;358      }359      var marker = fileMarker && fileMarker.marker;360      if (!marker || marker <= 0xFF00) {361        throw new JpegError('marker was not found');362      }363      if (marker >= 0xFFD0 && marker <= 0xFFD7) {364        offset += 2;365      } else {366        break;367      }368    }369    fileMarker = findNextFileMarker(data, offset);370    if (fileMarker && fileMarker.invalid) {371      (0, _util.warn)('decodeScan - unexpected Scan data, current marker is: ' + fileMarker.invalid);372      offset = fileMarker.offset;373    }374    return offset - startOffset;375  }376  function quantizeAndInverse(component, blockBufferOffset, p) {377    var qt = component.quantizationTable,378        blockData = component.blockData;379    var v0, v1, v2, v3, v4, v5, v6, v7;380    var p0, p1, p2, p3, p4, p5, p6, p7;381    var t;382    if (!qt) {383      throw new JpegError('missing required Quantization Table.');384    }385    for (var row = 0; row < 64; row += 8) {386      p0 = blockData[blockBufferOffset + row];387      p1 = blockData[blockBufferOffset + row + 1];388      p2 = blockData[blockBufferOffset + row + 2];389      p3 = blockData[blockBufferOffset + row + 3];390      p4 = blockData[blockBufferOffset + row + 4];391      p5 = blockData[blockBufferOffset + row + 5];392      p6 = blockData[blockBufferOffset + row + 6];393      p7 = blockData[blockBufferOffset + row + 7];394      p0 *= qt[row];395      if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {396        t = dctSqrt2 * p0 + 512 >> 10;397        p[row] = t;398        p[row + 1] = t;399        p[row + 2] = t;400        p[row + 3] = t;401        p[row + 4] = t;402        p[row + 5] = t;403        p[row + 6] = t;404        p[row + 7] = t;405        continue;406      }407      p1 *= qt[row + 1];408      p2 *= qt[row + 2];409      p3 *= qt[row + 3];410      p4 *= qt[row + 4];411      p5 *= qt[row + 5];412      p6 *= qt[row + 6];413      p7 *= qt[row + 7];414      v0 = dctSqrt2 * p0 + 128 >> 8;415      v1 = dctSqrt2 * p4 + 128 >> 8;416      v2 = p2;417      v3 = p6;418      v4 = dctSqrt1d2 * (p1 - p7) + 128 >> 8;419      v7 = dctSqrt1d2 * (p1 + p7) + 128 >> 8;420      v5 = p3 << 4;421      v6 = p5 << 4;422      v0 = v0 + v1 + 1 >> 1;423      v1 = v0 - v1;424      t = v2 * dctSin6 + v3 * dctCos6 + 128 >> 8;425      v2 = v2 * dctCos6 - v3 * dctSin6 + 128 >> 8;426      v3 = t;427      v4 = v4 + v6 + 1 >> 1;428      v6 = v4 - v6;429      v7 = v7 + v5 + 1 >> 1;430      v5 = v7 - v5;431      v0 = v0 + v3 + 1 >> 1;432      v3 = v0 - v3;433      v1 = v1 + v2 + 1 >> 1;434      v2 = v1 - v2;435      t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;436      v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;437      v7 = t;438      t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;439      v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;440      v6 = t;441      p[row] = v0 + v7;442      p[row + 7] = v0 - v7;443      p[row + 1] = v1 + v6;444      p[row + 6] = v1 - v6;445      p[row + 2] = v2 + v5;446      p[row + 5] = v2 - v5;447      p[row + 3] = v3 + v4;448      p[row + 4] = v3 - v4;449    }450    for (var col = 0; col < 8; ++col) {451      p0 = p[col];452      p1 = p[col + 8];453      p2 = p[col + 16];454      p3 = p[col + 24];455      p4 = p[col + 32];456      p5 = p[col + 40];457      p6 = p[col + 48];458      p7 = p[col + 56];459      if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {460        t = dctSqrt2 * p0 + 8192 >> 14;461        t = t < -2040 ? 0 : t >= 2024 ? 255 : t + 2056 >> 4;462        blockData[blockBufferOffset + col] = t;463        blockData[blockBufferOffset + col + 8] = t;464        blockData[blockBufferOffset + col + 16] = t;465        blockData[blockBufferOffset + col + 24] = t;466        blockData[blockBufferOffset + col + 32] = t;467        blockData[blockBufferOffset + col + 40] = t;468        blockData[blockBufferOffset + col + 48] = t;469        blockData[blockBufferOffset + col + 56] = t;470        continue;471      }472      v0 = dctSqrt2 * p0 + 2048 >> 12;473      v1 = dctSqrt2 * p4 + 2048 >> 12;474      v2 = p2;475      v3 = p6;476      v4 = dctSqrt1d2 * (p1 - p7) + 2048 >> 12;477      v7 = dctSqrt1d2 * (p1 + p7) + 2048 >> 12;478      v5 = p3;479      v6 = p5;480      v0 = (v0 + v1 + 1 >> 1) + 4112;481      v1 = v0 - v1;482      t = v2 * dctSin6 + v3 * dctCos6 + 2048 >> 12;483      v2 = v2 * dctCos6 - v3 * dctSin6 + 2048 >> 12;484      v3 = t;485      v4 = v4 + v6 + 1 >> 1;486      v6 = v4 - v6;487      v7 = v7 + v5 + 1 >> 1;488      v5 = v7 - v5;489      v0 = v0 + v3 + 1 >> 1;490      v3 = v0 - v3;491      v1 = v1 + v2 + 1 >> 1;492      v2 = v1 - v2;493      t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;494      v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;495      v7 = t;496      t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;497      v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;498      v6 = t;499      p0 = v0 + v7;500      p7 = v0 - v7;501      p1 = v1 + v6;502      p6 = v1 - v6;503      p2 = v2 + v5;504      p5 = v2 - v5;505      p3 = v3 + v4;506      p4 = v3 - v4;507      p0 = p0 < 16 ? 0 : p0 >= 4080 ? 255 : p0 >> 4;508      p1 = p1 < 16 ? 0 : p1 >= 4080 ? 255 : p1 >> 4;509      p2 = p2 < 16 ? 0 : p2 >= 4080 ? 255 : p2 >> 4;510      p3 = p3 < 16 ? 0 : p3 >= 4080 ? 255 : p3 >> 4;511      p4 = p4 < 16 ? 0 : p4 >= 4080 ? 255 : p4 >> 4;512      p5 = p5 < 16 ? 0 : p5 >= 4080 ? 255 : p5 >> 4;513      p6 = p6 < 16 ? 0 : p6 >= 4080 ? 255 : p6 >> 4;514      p7 = p7 < 16 ? 0 : p7 >= 4080 ? 255 : p7 >> 4;515      blockData[blockBufferOffset + col] = p0;516      blockData[blockBufferOffset + col + 8] = p1;517      blockData[blockBufferOffset + col + 16] = p2;518      blockData[blockBufferOffset + col + 24] = p3;519      blockData[blockBufferOffset + col + 32] = p4;520      blockData[blockBufferOffset + col + 40] = p5;521      blockData[blockBufferOffset + col + 48] = p6;522      blockData[blockBufferOffset + col + 56] = p7;523    }524  }525  function buildComponentData(frame, component) {526    var blocksPerLine = component.blocksPerLine;527    var blocksPerColumn = component.blocksPerColumn;528    var computationBuffer = new Int16Array(64);529    for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {530      for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {531        var offset = getBlockBufferOffset(component, blockRow, blockCol);532        quantizeAndInverse(component, offset, computationBuffer);533      }534    }535    return component.blockData;536  }537  function findNextFileMarker(data, currentPos) {538    var startPos = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : currentPos;539    function peekUint16(pos) {540      return data[pos] << 8 | data[pos + 1];541    }542    var maxPos = data.length - 1;543    var newPos = startPos < currentPos ? startPos : currentPos;544    if (currentPos >= maxPos) {545      return null;546    }547    var currentMarker = peekUint16(currentPos);548    if (currentMarker >= 0xFFC0 && currentMarker <= 0xFFFE) {549      return {550        invalid: null,551        marker: currentMarker,552        offset: currentPos553      };554    }555    var newMarker = peekUint16(newPos);556    while (!(newMarker >= 0xFFC0 && newMarker <= 0xFFFE)) {557      if (++newPos >= maxPos) {558        return null;559      }560      newMarker = peekUint16(newPos);561    }562    return {563      invalid: currentMarker.toString(16),564      marker: newMarker,565      offset: newPos566    };567  }568  JpegImage.prototype = {569    parse: function parse(data) {570      var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},571          _ref$dnlScanLines = _ref.dnlScanLines,572          dnlScanLines = _ref$dnlScanLines === undefined ? null : _ref$dnlScanLines;573      function readUint16() {574        var value = data[offset] << 8 | data[offset + 1];575        offset += 2;576        return value;577      }578      function readDataBlock() {579        var length = readUint16();580        var endOffset = offset + length - 2;581        var fileMarker = findNextFileMarker(data, endOffset, offset);582        if (fileMarker && fileMarker.invalid) {583          (0, _util.warn)('readDataBlock - incorrect length, current marker is: ' + fileMarker.invalid);584          endOffset = fileMarker.offset;585        }586        var array = data.subarray(offset, endOffset);587        offset += array.length;588        return array;589      }590      function prepareComponents(frame) {591        var mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / frame.maxH);592        var mcusPerColumn = Math.ceil(frame.scanLines / 8 / frame.maxV);593        for (var i = 0; i < frame.components.length; i++) {594          component = frame.components[i];595          var blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / frame.maxH);596          var blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines / 8) * component.v / frame.maxV);597          var blocksPerLineForMcu = mcusPerLine * component.h;598          var blocksPerColumnForMcu = mcusPerColumn * component.v;599          var blocksBufferSize = 64 * blocksPerColumnForMcu * (blocksPerLineForMcu + 1);600          component.blockData = new Int16Array(blocksBufferSize);601          component.blocksPerLine = blocksPerLine;602          component.blocksPerColumn = blocksPerColumn;603        }604        frame.mcusPerLine = mcusPerLine;605        frame.mcusPerColumn = mcusPerColumn;606      }607      var offset = 0;608      var jfif = null;609      var adobe = null;610      var frame, resetInterval;611      var numSOSMarkers = 0;612      var quantizationTables = [];613      var huffmanTablesAC = [],614          huffmanTablesDC = [];615      var fileMarker = readUint16();616      if (fileMarker !== 0xFFD8) {617        throw new JpegError('SOI not found');618      }619      fileMarker = readUint16();620      while (fileMarker !== 0xFFD9) {621        var i, j, l;622        switch (fileMarker) {623          case 0xFFE0:624          case 0xFFE1:625          case 0xFFE2:626          case 0xFFE3:627          case 0xFFE4:628          case 0xFFE5:629          case 0xFFE6:630          case 0xFFE7:631          case 0xFFE8:632          case 0xFFE9:633          case 0xFFEA:634          case 0xFFEB:635          case 0xFFEC:636          case 0xFFED:637          case 0xFFEE:638          case 0xFFEF:639          case 0xFFFE:640            var appData = readDataBlock();641            if (fileMarker === 0xFFE0) {642              if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 && appData[3] === 0x46 && appData[4] === 0) {643                jfif = {644                  version: {645                    major: appData[5],646                    minor: appData[6]647                  },648                  densityUnits: appData[7],649                  xDensity: appData[8] << 8 | appData[9],650                  yDensity: appData[10] << 8 | appData[11],651                  thumbWidth: appData[12],652                  thumbHeight: appData[13],653                  thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])654                };655              }656            }657            if (fileMarker === 0xFFEE) {658              if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F && appData[3] === 0x62 && appData[4] === 0x65) {659                adobe = {660                  version: appData[5] << 8 | appData[6],661                  flags0: appData[7] << 8 | appData[8],662                  flags1: appData[9] << 8 | appData[10],663                  transformCode: appData[11]664                };665              }666            }667            break;668          case 0xFFDB:669            var quantizationTablesLength = readUint16();670            var quantizationTablesEnd = quantizationTablesLength + offset - 2;671            var z;672            while (offset < quantizationTablesEnd) {673              var quantizationTableSpec = data[offset++];674              var tableData = new Uint16Array(64);675              if (quantizationTableSpec >> 4 === 0) {676                for (j = 0; j < 64; j++) {677                  z = dctZigZag[j];678                  tableData[z] = data[offset++];679                }680              } else if (quantizationTableSpec >> 4 === 1) {681                for (j = 0; j < 64; j++) {682                  z = dctZigZag[j];683                  tableData[z] = readUint16();684                }685              } else {686                throw new JpegError('DQT - invalid table spec');687              }688              quantizationTables[quantizationTableSpec & 15] = tableData;689            }690            break;691          case 0xFFC0:692          case 0xFFC1:693          case 0xFFC2:694            if (frame) {695              throw new JpegError('Only single frame JPEGs supported');696            }697            readUint16();698            frame = {};699            frame.extended = fileMarker === 0xFFC1;700            frame.progressive = fileMarker === 0xFFC2;701            frame.precision = data[offset++];702            var sofScanLines = readUint16();703            frame.scanLines = dnlScanLines || sofScanLines;704            frame.samplesPerLine = readUint16();705            frame.components = [];706            frame.componentIds = {};707            var componentsCount = data[offset++],708                componentId;709            var maxH = 0,710                maxV = 0;711            for (i = 0; i < componentsCount; i++) {712              componentId = data[offset];713              var h = data[offset + 1] >> 4;714              var v = data[offset + 1] & 15;715              if (maxH < h) {716                maxH = h;717              }718              if (maxV < v) {719                maxV = v;720              }721              var qId = data[offset + 2];722              l = frame.components.push({723                h: h,724                v: v,725                quantizationId: qId,726                quantizationTable: null727              });728              frame.componentIds[componentId] = l - 1;729              offset += 3;730            }731            frame.maxH = maxH;732            frame.maxV = maxV;733            prepareComponents(frame);734            break;735          case 0xFFC4:736            var huffmanLength = readUint16();737            for (i = 2; i < huffmanLength;) {738              var huffmanTableSpec = data[offset++];739              var codeLengths = new Uint8Array(16);740              var codeLengthSum = 0;741              for (j = 0; j < 16; j++, offset++) {742                codeLengthSum += codeLengths[j] = data[offset];743              }744              var huffmanValues = new Uint8Array(codeLengthSum);745              for (j = 0; j < codeLengthSum; j++, offset++) {746                huffmanValues[j] = data[offset];747              }748              i += 17 + codeLengthSum;749              (huffmanTableSpec >> 4 === 0 ? huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] = buildHuffmanTable(codeLengths, huffmanValues);750            }751            break;752          case 0xFFDD:753            readUint16();754            resetInterval = readUint16();755            break;756          case 0xFFDA:757            var parseDNLMarker = ++numSOSMarkers === 1 && !dnlScanLines;758            readUint16();759            var selectorsCount = data[offset++];760            var components = [],761                component;762            for (i = 0; i < selectorsCount; i++) {763              var componentIndex = frame.componentIds[data[offset++]];764              component = frame.components[componentIndex];765              var tableSpec = data[offset++];766              component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];767              component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];768              components.push(component);769            }770            var spectralStart = data[offset++];771            var spectralEnd = data[offset++];772            var successiveApproximation = data[offset++];773            try {774              var processed = decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successiveApproximation >> 4, successiveApproximation & 15, parseDNLMarker);775              offset += processed;776            } catch (ex) {777              if (ex instanceof DNLMarkerError) {778                (0, _util.warn)('Attempting to re-parse JPEG image using "scanLines" ' + 'parameter found in DNL marker (0xFFDC) segment.');779                return this.parse(data, { dnlScanLines: ex.scanLines });780              }781              throw ex;782            }783            break;784          case 0xFFDC:785            offset += 4;786            break;787          case 0xFFFF:788            if (data[offset] !== 0xFF) {789              offset--;790            }791            break;792          default:793            if (data[offset - 3] === 0xFF && data[offset - 2] >= 0xC0 && data[offset - 2] <= 0xFE) {794              offset -= 3;795              break;796            }797            var nextFileMarker = findNextFileMarker(data, offset - 2);798            if (nextFileMarker && nextFileMarker.invalid) {799              (0, _util.warn)('JpegImage.parse - unexpected data, current marker is: ' + nextFileMarker.invalid);800              offset = nextFileMarker.offset;801              break;802            }803            throw new JpegError('unknown marker ' + fileMarker.toString(16));804        }805        fileMarker = readUint16();806      }807      this.width = frame.samplesPerLine;808      this.height = frame.scanLines;809      this.jfif = jfif;810      this.adobe = adobe;811      this.components = [];...

Using AI Code Generation

1var wpt = require('wpt');2var fs = require('fs');3var file = fs.readFileSync('test.txt');4var fileMarker = wpt.findNextFileMarker(file, 0);5console.log(fileMarker);6var wpt = require('wpt');7var fs = require('fs');8var file = fs.readFileSync('test.txt');9var fileMarker = wpt.findNextFileMarker(file, 0);10console.log(fileMarker);11var wpt = require('wpt');12var fs = require('fs');13var file = fs.readFileSync('test.txt');14var fileMarker = wpt.findNextFileMarker(file, 0);15console.log(fileMarker);16var wpt = require('wpt');17var fs = require('fs');18var file = fs.readFileSync('test.txt');19var fileMarker = wpt.findNextFileMarker(file, 0);20console.log(fileMarker);21var wpt = require('wpt');22var fs = require('fs');23var file = fs.readFileSync('test.txt');24var fileMarker = wpt.findNextFileMarker(file, 0);25console.log(fileMarker);26var wpt = require('wpt');27var fs = require('fs');28var file = fs.readFileSync('test.txt');29var fileMarker = wpt.findNextFileMarker(file, 0);30console.log(fileMarker);31var wpt = require('wpt');32var fs = require('fs');33var file = fs.readFileSync('test.txt');34var fileMarker = wpt.findNextFileMarker(file, 0);35console.log(fileMarker);

Using AI Code Generation

1var wptools = require('wptools');2var page = wptools.page('Albert Einstein');3page.findNextFileMarker("File:Albert Einstein Head.jpg", function(err, resp) {4  console.log(resp);5});6### findNextFileMarker(marker, callback)

Using AI Code Generation

1var wptools = require('wptools');2var page = wptools.page('Barack Obama');3page.findNextFileMarker('Barack Obama', 'thumb', 'Obama family 2013.jpg', function(err, fileMarker) {4	console.log(err);5	console.log(fileMarker);6});

Using AI Code Generation

1var wptool = require('./wptool');2var wp = new wptool();3wp.setFilePath('test.txt');4wp.readFile();5var nextFileMarker = wp.findNextFileMarker();6console.log(nextFileMarker);

Using AI Code Generation

1const wptMapper = require('wpt-mapper');2const mapper = new wptMapper();3const fileMarker = mapper.findNextFileMarker('test.wpt');4console.log(fileMarker);5{6}7const wptMapper = require('wpt-mapper');8const mapper = new wptMapper();9const testMarker = mapper.findNextTestMarker('test.wpt');10console.log(testMarker);11{12}13const wptMapper = require('wpt-mapper');14const mapper = new wptMapper();15const fileMarker = mapper.findNextFileMarker('test.wpt');16const testMarker = mapper.findNextTestMarker('test.wpt');17console.log(fileMarker);18console.log(testMarker);19{20}21{22}23const wptMapper = require('wpt-mapper');24const mapper = new wptMapper();25const fileMarker = mapper.findNextFileMarker('test.wpt');

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