lerc - npm Package Compare versions

Comparing version 3.0.0 to 4.0.0

CHANGELOG.md

@@ -10,2 +10,11 @@ # Change Log
 
+Now uses web assembly, as a result:
+* The existing Javascript decoder ```js/LercDecode.js``` is deprecated. It will be removed in next major release.
+* [Web Assembly](https://caniuse.com/wasm) support is now required. IE11 is therefore no longer supported.
+* ```Lerc.load()``` must be invoked and the returned promise must be resolved prior to ```Lerc.decode```. This only needs to be done once per worker (or the main thread). There's no extra cost when invoked multiple times as the internal wasm loading promise is cached.
+* Updated build script ```npm run build```. A dev build result (unminified UMD bundle) is included in the ```js/dist``` folder for convenience.
+* Both UMD and ES modules are included in dist, along with a typing file.
+* Deprecated ```decodeResult.dimCount, decodeOptions.returnPixelInterleavedDims```, prefer to use ```depthCount, returnInterleaved```
+which is in line with C API concept.
+
 ## [3.0.0] - 2021-07-30
@@ -12,0 +21,0 @@

LercDecode.min.js

@@ -1,2 +0,17 @@
-/* Copyright 2015-2021 Esri. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 @preserve */
-(function(){var LercDecode=function(){var CntZImage={};CntZImage.defaultNoDataValue=-34027999387901484e22;CntZImage.decode=function(input,options){options=options||{};var skipMask=options.encodedMaskData||options.encodedMaskData===null;var parsedData=parse(input,options.inputOffset||0,skipMask);var noDataValue=options.noDataValue!==null?options.noDataValue:CntZImage.defaultNoDataValue;var uncompressedData=uncompressPixelValues(parsedData,options.pixelType||Float32Array,options.encodedMaskData,noDataValue,options.returnMask);var result={width:parsedData.width,height:parsedData.height,pixelData:uncompressedData.resultPixels,minValue:uncompressedData.minValue,maxValue:parsedData.pixels.maxValue,noDataValue:noDataValue};if(uncompressedData.resultMask){result.maskData=uncompressedData.resultMask}if(options.returnEncodedMask&&parsedData.mask){result.encodedMaskData=parsedData.mask.bitset?parsedData.mask.bitset:null}if(options.returnFileInfo){result.fileInfo=formatFileInfo(parsedData);if(options.computeUsedBitDepths){result.fileInfo.bitDepths=computeUsedBitDepths(parsedData)}}return result};var uncompressPixelValues=function(data,TypedArrayClass,maskBitset,noDataValue,storeDecodedMask){var blockIdx=0;var numX=data.pixels.numBlocksX;var numY=data.pixels.numBlocksY;var blockWidth=Math.floor(data.width/numX);var blockHeight=Math.floor(data.height/numY);var scale=2*data.maxZError;var minValue=Number.MAX_VALUE,currentValue;maskBitset=maskBitset||(data.mask?data.mask.bitset:null);var resultPixels,resultMask;resultPixels=new TypedArrayClass(data.width*data.height);if(storeDecodedMask&&maskBitset){resultMask=new Uint8Array(data.width*data.height)}var blockDataBuffer=new Float32Array(blockWidth*blockHeight);var xx,yy;for(var y=0;y<=numY;y++){var thisBlockHeight=y!==numY?blockHeight:data.height%numY;if(thisBlockHeight===0){continue}for(var x=0;x<=numX;x++){var thisBlockWidth=x!==numX?blockWidth:data.width%numX;if(thisBlockWidth===0){continue}var outPtr=y*data.width*blockHeight+x*blockWidth;var outStride=data.width-thisBlockWidth;var block=data.pixels.blocks[blockIdx];var blockData,blockPtr,constValue;if(block.encoding<2){if(block.encoding===0){blockData=block.rawData}else{unstuff(block.stuffedData,block.bitsPerPixel,block.numValidPixels,block.offset,scale,blockDataBuffer,data.pixels.maxValue);blockData=blockDataBuffer}blockPtr=0}else if(block.encoding===2){constValue=0}else{constValue=block.offset}var maskByte;if(maskBitset){for(yy=0;yy<thisBlockHeight;yy++){if(outPtr&7){maskByte=maskBitset[outPtr>>3];maskByte<<=outPtr&7}for(xx=0;xx<thisBlockWidth;xx++){if(!(outPtr&7)){maskByte=maskBitset[outPtr>>3]}if(maskByte&128){if(resultMask){resultMask[outPtr]=1}currentValue=block.encoding<2?blockData[blockPtr++]:constValue;minValue=minValue>currentValue?currentValue:minValue;resultPixels[outPtr++]=currentValue}else{if(resultMask){resultMask[outPtr]=0}resultPixels[outPtr++]=noDataValue}maskByte<<=1}outPtr+=outStride}}else{if(block.encoding<2){for(yy=0;yy<thisBlockHeight;yy++){for(xx=0;xx<thisBlockWidth;xx++){currentValue=blockData[blockPtr++];minValue=minValue>currentValue?currentValue:minValue;resultPixels[outPtr++]=currentValue}outPtr+=outStride}}else{minValue=minValue>constValue?constValue:minValue;for(yy=0;yy<thisBlockHeight;yy++){for(xx=0;xx<thisBlockWidth;xx++){resultPixels[outPtr++]=constValue}outPtr+=outStride}}}if(block.encoding===1&&blockPtr!==block.numValidPixels){throw"Block and Mask do not match"}blockIdx++}}return{resultPixels:resultPixels,resultMask:resultMask,minValue:minValue}};var formatFileInfo=function(data){return{fileIdentifierString:data.fileIdentifierString,fileVersion:data.fileVersion,imageType:data.imageType,height:data.height,width:data.width,maxZError:data.maxZError,eofOffset:data.eofOffset,mask:data.mask?{numBlocksX:data.mask.numBlocksX,numBlocksY:data.mask.numBlocksY,numBytes:data.mask.numBytes,maxValue:data.mask.maxValue}:null,pixels:{numBlocksX:data.pixels.numBlocksX,numBlocksY:data.pixels.numBlocksY,numBytes:data.pixels.numBytes,maxValue:data.pixels.maxValue,noDataValue:data.noDataValue}}};var computeUsedBitDepths=function(data){var numBlocks=data.pixels.numBlocksX*data.pixels.numBlocksY;var bitDepths={};for(var i=0;i<numBlocks;i++){var block=data.pixels.blocks[i];if(block.encoding===0){bitDepths.float32=true}else if(block.encoding===1){bitDepths[block.bitsPerPixel]=true}else{bitDepths[0]=true}}return Object.keys(bitDepths)};var parse=function(input,fp,skipMask){var data={};var fileIdView=new Uint8Array(input,fp,10);data.fileIdentifierString=String.fromCharCode.apply(null,fileIdView);if(data.fileIdentifierString.trim()!=="CntZImage"){throw"Unexpected file identifier string: "+data.fileIdentifierString}fp+=10;var view=new DataView(input,fp,24);data.fileVersion=view.getInt32(0,true);data.imageType=view.getInt32(4,true);data.height=view.getUint32(8,true);data.width=view.getUint32(12,true);data.maxZError=view.getFloat64(16,true);fp+=24;if(!skipMask){view=new DataView(input,fp,16);data.mask={};data.mask.numBlocksY=view.getUint32(0,true);data.mask.numBlocksX=view.getUint32(4,true);data.mask.numBytes=view.getUint32(8,true);data.mask.maxValue=view.getFloat32(12,true);fp+=16;if(data.mask.numBytes>0){var bitset=new Uint8Array(Math.ceil(data.width*data.height/8));view=new DataView(input,fp,data.mask.numBytes);var cnt=view.getInt16(0,true);var ip=2,op=0;do{if(cnt>0){while(cnt--){bitset[op++]=view.getUint8(ip++)}}else{var val=view.getUint8(ip++);cnt=-cnt;while(cnt--){bitset[op++]=val}}cnt=view.getInt16(ip,true);ip+=2}while(ip<data.mask.numBytes);if(cnt!==-32768||op<bitset.length){throw"Unexpected end of mask RLE encoding"}data.mask.bitset=bitset;fp+=data.mask.numBytes}else if((data.mask.numBytes|data.mask.numBlocksY|data.mask.maxValue)===0){data.mask.bitset=new Uint8Array(Math.ceil(data.width*data.height/8))}}view=new DataView(input,fp,16);data.pixels={};data.pixels.numBlocksY=view.getUint32(0,true);data.pixels.numBlocksX=view.getUint32(4,true);data.pixels.numBytes=view.getUint32(8,true);data.pixels.maxValue=view.getFloat32(12,true);fp+=16;var numBlocksX=data.pixels.numBlocksX;var numBlocksY=data.pixels.numBlocksY;var actualNumBlocksX=numBlocksX+(data.width%numBlocksX>0?1:0);var actualNumBlocksY=numBlocksY+(data.height%numBlocksY>0?1:0);data.pixels.blocks=new Array(actualNumBlocksX*actualNumBlocksY);var blockI=0;for(var blockY=0;blockY<actualNumBlocksY;blockY++){for(var blockX=0;blockX<actualNumBlocksX;blockX++){var size=0;var bytesLeft=input.byteLength-fp;view=new DataView(input,fp,Math.min(10,bytesLeft));var block={};data.pixels.blocks[blockI++]=block;var headerByte=view.getUint8(0);size++;block.encoding=headerByte&63;if(block.encoding>3){throw"Invalid block encoding ("+block.encoding+")"}if(block.encoding===2){fp++;continue}if(headerByte!==0&&headerByte!==2){headerByte>>=6;block.offsetType=headerByte;if(headerByte===2){block.offset=view.getInt8(1);size++}else if(headerByte===1){block.offset=view.getInt16(1,true);size+=2}else if(headerByte===0){block.offset=view.getFloat32(1,true);size+=4}else{throw"Invalid block offset type"}if(block.encoding===1){headerByte=view.getUint8(size);size++;block.bitsPerPixel=headerByte&63;headerByte>>=6;block.numValidPixelsType=headerByte;if(headerByte===2){block.numValidPixels=view.getUint8(size);size++}else if(headerByte===1){block.numValidPixels=view.getUint16(size,true);size+=2}else if(headerByte===0){block.numValidPixels=view.getUint32(size,true);size+=4}else{throw"Invalid valid pixel count type"}}}fp+=size;if(block.encoding===3){continue}var arrayBuf,store8;if(block.encoding===0){var numPixels=(data.pixels.numBytes-1)/4;if(numPixels!==Math.floor(numPixels)){throw"uncompressed block has invalid length"}arrayBuf=new ArrayBuffer(numPixels*4);store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,fp,numPixels*4));var rawData=new Float32Array(arrayBuf);block.rawData=rawData;fp+=numPixels*4}else if(block.encoding===1){var dataBytes=Math.ceil(block.numValidPixels*block.bitsPerPixel/8);var dataWords=Math.ceil(dataBytes/4);arrayBuf=new ArrayBuffer(dataWords*4);store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,fp,dataBytes));block.stuffedData=new Uint32Array(arrayBuf);fp+=dataBytes}}}data.eofOffset=fp;return data};var unstuff=function(src,bitsPerPixel,numPixels,offset,scale,dest,maxValue){var bitMask=(1<<bitsPerPixel)-1;var i=0,o;var bitsLeft=0;var n,buffer;var nmax=Math.ceil((maxValue-offset)/scale);var numInvalidTailBytes=src.length*4-Math.ceil(bitsPerPixel*numPixels/8);src[src.length-1]<<=8*numInvalidTailBytes;for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitsLeft-bitsPerPixel&bitMask;bitsLeft-=bitsPerPixel}else{var missingBits=bitsPerPixel-bitsLeft;n=(buffer&bitMask)<<missingBits&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n+=buffer>>>bitsLeft}dest[o]=n<nmax?offset+n*scale:maxValue}return dest};return CntZImage}();var Lerc2Decode=function(){"use strict";var BitStuffer={unstuff:function(src,dest,bitsPerPixel,numPixels,lutArr,offset,scale,maxValue){var bitMask=(1<<bitsPerPixel)-1;var i=0,o;var bitsLeft=0;var n,buffer,missingBits,nmax;var numInvalidTailBytes=src.length*4-Math.ceil(bitsPerPixel*numPixels/8);src[src.length-1]<<=8*numInvalidTailBytes;if(lutArr){for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitsLeft-bitsPerPixel&bitMask;bitsLeft-=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=(buffer&bitMask)<<missingBits&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n+=buffer>>>bitsLeft}dest[o]=lutArr[n]}}else{nmax=Math.ceil((maxValue-offset)/scale);for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitsLeft-bitsPerPixel&bitMask;bitsLeft-=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=(buffer&bitMask)<<missingBits&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n+=buffer>>>bitsLeft}dest[o]=n<nmax?offset+n*scale:maxValue}}},unstuffLUT:function(src,bitsPerPixel,numPixels,offset,scale,maxValue){var bitMask=(1<<bitsPerPixel)-1;var i=0,o=0,missingBits=0,bitsLeft=0,n=0;var buffer;var dest=[];var numInvalidTailBytes=src.length*4-Math.ceil(bitsPerPixel*numPixels/8);src[src.length-1]<<=8*numInvalidTailBytes;var nmax=Math.ceil((maxValue-offset)/scale);for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitsLeft-bitsPerPixel&bitMask;bitsLeft-=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=(buffer&bitMask)<<missingBits&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n+=buffer>>>bitsLeft}dest[o]=n<nmax?offset+n*scale:maxValue}dest.unshift(offset);return dest},unstuff2:function(src,dest,bitsPerPixel,numPixels,lutArr,offset,scale,maxValue){var bitMask=(1<<bitsPerPixel)-1;var i=0,o;var bitsLeft=0,bitPos=0;var n,buffer,missingBits;if(lutArr){for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32;bitPos=0}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitPos&bitMask;bitsLeft-=bitsPerPixel;bitPos+=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=buffer>>>bitPos&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n|=(buffer&(1<<missingBits)-1)<<bitsPerPixel-missingBits;bitPos=missingBits}dest[o]=lutArr[n]}}else{var nmax=Math.ceil((maxValue-offset)/scale);for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32;bitPos=0}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitPos&bitMask;bitsLeft-=bitsPerPixel;bitPos+=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=buffer>>>bitPos&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n|=(buffer&(1<<missingBits)-1)<<bitsPerPixel-missingBits;bitPos=missingBits}dest[o]=n<nmax?offset+n*scale:maxValue}}return dest},unstuffLUT2:function(src,bitsPerPixel,numPixels,offset,scale,maxValue){var bitMask=(1<<bitsPerPixel)-1;var i=0,o=0,missingBits=0,bitsLeft=0,n=0,bitPos=0;var buffer;var dest=[];var nmax=Math.ceil((maxValue-offset)/scale);for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32;bitPos=0}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitPos&bitMask;bitsLeft-=bitsPerPixel;bitPos+=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=buffer>>>bitPos&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n|=(buffer&(1<<missingBits)-1)<<bitsPerPixel-missingBits;bitPos=missingBits}dest[o]=n<nmax?offset+n*scale:maxValue}dest.unshift(offset);return dest},originalUnstuff:function(src,dest,bitsPerPixel,numPixels){var bitMask=(1<<bitsPerPixel)-1;var i=0,o;var bitsLeft=0;var n,buffer,missingBits;var numInvalidTailBytes=src.length*4-Math.ceil(bitsPerPixel*numPixels/8);src[src.length-1]<<=8*numInvalidTailBytes;for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitsLeft-bitsPerPixel&bitMask;bitsLeft-=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=(buffer&bitMask)<<missingBits&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n+=buffer>>>bitsLeft}dest[o]=n}return dest},originalUnstuff2:function(src,dest,bitsPerPixel,numPixels){var bitMask=(1<<bitsPerPixel)-1;var i=0,o;var bitsLeft=0,bitPos=0;var n,buffer,missingBits;for(o=0;o<numPixels;o++){if(bitsLeft===0){buffer=src[i++];bitsLeft=32;bitPos=0}if(bitsLeft>=bitsPerPixel){n=buffer>>>bitPos&bitMask;bitsLeft-=bitsPerPixel;bitPos+=bitsPerPixel}else{missingBits=bitsPerPixel-bitsLeft;n=buffer>>>bitPos&bitMask;buffer=src[i++];bitsLeft=32-missingBits;n|=(buffer&(1<<missingBits)-1)<<bitsPerPixel-missingBits;bitPos=missingBits}dest[o]=n}return dest}};var Lerc2Helpers={HUFFMAN_LUT_BITS_MAX:12,computeChecksumFletcher32:function(input){var sum1=65535,sum2=65535;var len=input.length;var words=Math.floor(len/2);var i=0;while(words){var tlen=words>=359?359:words;words-=tlen;do{sum1+=input[i++]<<8;sum2+=sum1+=input[i++]}while(--tlen);sum1=(sum1&65535)+(sum1>>>16);sum2=(sum2&65535)+(sum2>>>16)}if(len&1){sum2+=sum1+=input[i]<<8}sum1=(sum1&65535)+(sum1>>>16);sum2=(sum2&65535)+(sum2>>>16);return(sum2<<16|sum1)>>>0},readHeaderInfo:function(input,data){var ptr=data.ptr;var fileIdView=new Uint8Array(input,ptr,6);var headerInfo={};headerInfo.fileIdentifierString=String.fromCharCode.apply(null,fileIdView);if(headerInfo.fileIdentifierString.lastIndexOf("Lerc2",0)!==0){throw"Unexpected file identifier string (expect Lerc2 ): "+headerInfo.fileIdentifierString}ptr+=6;var view=new DataView(input,ptr,8);var fileVersion=view.getInt32(0,true);headerInfo.fileVersion=fileVersion;ptr+=4;if(fileVersion>=3){headerInfo.checksum=view.getUint32(4,true);ptr+=4}view=new DataView(input,ptr,12);headerInfo.height=view.getUint32(0,true);headerInfo.width=view.getUint32(4,true);ptr+=8;if(fileVersion>=4){headerInfo.numDims=view.getUint32(8,true);ptr+=4}else{headerInfo.numDims=1}view=new DataView(input,ptr,40);headerInfo.numValidPixel=view.getUint32(0,true);headerInfo.microBlockSize=view.getInt32(4,true);headerInfo.blobSize=view.getInt32(8,true);headerInfo.imageType=view.getInt32(12,true);headerInfo.maxZError=view.getFloat64(16,true);headerInfo.zMin=view.getFloat64(24,true);headerInfo.zMax=view.getFloat64(32,true);ptr+=40;data.headerInfo=headerInfo;data.ptr=ptr;var checksum,keyLength;if(fileVersion>=3){keyLength=fileVersion>=4?52:48;checksum=this.computeChecksumFletcher32(new Uint8Array(input,ptr-keyLength,headerInfo.blobSize-14));if(checksum!==headerInfo.checksum){throw"Checksum failed."}}return true},checkMinMaxRanges:function(input,data){var headerInfo=data.headerInfo;var OutPixelTypeArray=this.getDataTypeArray(headerInfo.imageType);var rangeBytes=headerInfo.numDims*this.getDataTypeSize(headerInfo.imageType);var minValues=this.readSubArray(input,data.ptr,OutPixelTypeArray,rangeBytes);var maxValues=this.readSubArray(input,data.ptr+rangeBytes,OutPixelTypeArray,rangeBytes);data.ptr+=2*rangeBytes;var i,equal=true;for(i=0;i<headerInfo.numDims;i++){if(minValues[i]!==maxValues[i]){equal=false;break}}headerInfo.minValues=minValues;headerInfo.maxValues=maxValues;return equal},readSubArray:function(input,ptr,OutPixelTypeArray,numBytes){var rawData;if(OutPixelTypeArray===Uint8Array){rawData=new Uint8Array(input,ptr,numBytes)}else{var arrayBuf=new ArrayBuffer(numBytes);var store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,ptr,numBytes));rawData=new OutPixelTypeArray(arrayBuf)}return rawData},readMask:function(input,data){var ptr=data.ptr;var headerInfo=data.headerInfo;var numPixels=headerInfo.width*headerInfo.height;var numValidPixel=headerInfo.numValidPixel;var view=new DataView(input,ptr,4);var mask={};mask.numBytes=view.getUint32(0,true);ptr+=4;if((0===numValidPixel||numPixels===numValidPixel)&&0!==mask.numBytes){throw"invalid mask"}var bitset,resultMask;if(numValidPixel===0){bitset=new Uint8Array(Math.ceil(numPixels/8));mask.bitset=bitset;resultMask=new Uint8Array(numPixels);data.pixels.resultMask=resultMask;ptr+=mask.numBytes}else if(mask.numBytes>0){bitset=new Uint8Array(Math.ceil(numPixels/8));view=new DataView(input,ptr,mask.numBytes);var cnt=view.getInt16(0,true);var ip=2,op=0,val=0;do{if(cnt>0){while(cnt--){bitset[op++]=view.getUint8(ip++)}}else{val=view.getUint8(ip++);cnt=-cnt;while(cnt--){bitset[op++]=val}}cnt=view.getInt16(ip,true);ip+=2}while(ip<mask.numBytes);if(cnt!==-32768||op<bitset.length){throw"Unexpected end of mask RLE encoding"}resultMask=new Uint8Array(numPixels);var mb=0,k=0;for(k=0;k<numPixels;k++){if(k&7){mb=bitset[k>>3];mb<<=k&7}else{mb=bitset[k>>3]}if(mb&128){resultMask[k]=1}}data.pixels.resultMask=resultMask;mask.bitset=bitset;ptr+=mask.numBytes}data.ptr=ptr;data.mask=mask;return true},readDataOneSweep:function(input,data,OutPixelTypeArray,useBSQForOutputDim){var ptr=data.ptr;var headerInfo=data.headerInfo;var numDims=headerInfo.numDims;var numPixels=headerInfo.width*headerInfo.height;var imageType=headerInfo.imageType;var numBytes=headerInfo.numValidPixel*Lerc2Helpers.getDataTypeSize(imageType)*numDims;var rawData;var mask=data.pixels.resultMask;if(OutPixelTypeArray===Uint8Array){rawData=new Uint8Array(input,ptr,numBytes)}else{var arrayBuf=new ArrayBuffer(numBytes);var store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,ptr,numBytes));rawData=new OutPixelTypeArray(arrayBuf)}if(rawData.length===numPixels*numDims){if(useBSQForOutputDim){data.pixels.resultPixels=Lerc2Helpers.swapDimensionOrder(rawData,numPixels,numDims,OutPixelTypeArray,true)}else{data.pixels.resultPixels=rawData}}else{data.pixels.resultPixels=new OutPixelTypeArray(numPixels*numDims);var z=0,k=0,i=0,nStart=0;if(numDims>1){if(useBSQForOutputDim){for(k=0;k<numPixels;k++){if(mask[k]){nStart=k;for(i=0;i<numDims;i++,nStart+=numPixels){data.pixels.resultPixels[nStart]=rawData[z++]}}}}else{for(k=0;k<numPixels;k++){if(mask[k]){nStart=k*numDims;for(i=0;i<numDims;i++){data.pixels.resultPixels[nStart+i]=rawData[z++]}}}}}else{for(k=0;k<numPixels;k++){if(mask[k]){data.pixels.resultPixels[k]=rawData[z++]}}}}ptr+=numBytes;data.ptr=ptr;return true},readHuffmanTree:function(input,data){var BITS_MAX=this.HUFFMAN_LUT_BITS_MAX;var view=new DataView(input,data.ptr,16);data.ptr+=16;var version=view.getInt32(0,true);if(version<2){throw"unsupported Huffman version"}var size=view.getInt32(4,true);var i0=view.getInt32(8,true);var i1=view.getInt32(12,true);if(i0>=i1){return false}var blockDataBuffer=new Uint32Array(i1-i0);Lerc2Helpers.decodeBits(input,data,blockDataBuffer);var codeTable=[];var i,j,k,len;for(i=i0;i<i1;i++){j=i-(i<size?0:size);codeTable[j]={first:blockDataBuffer[i-i0],second:null}}var dataBytes=input.byteLength-data.ptr;var dataWords=Math.ceil(dataBytes/4);var arrayBuf=new ArrayBuffer(dataWords*4);var store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,data.ptr,dataBytes));var stuffedData=new Uint32Array(arrayBuf);var bitPos=0,word,srcPtr=0;word=stuffedData[0];for(i=i0;i<i1;i++){j=i-(i<size?0:size);len=codeTable[j].first;if(len>0){codeTable[j].second=word<<bitPos>>>32-len;if(32-bitPos>=len){bitPos+=len;if(bitPos===32){bitPos=0;srcPtr++;word=stuffedData[srcPtr]}}else{bitPos+=len-32;srcPtr++;word=stuffedData[srcPtr];codeTable[j].second|=word>>>32-bitPos}}}var numBitsLUT=0,numBitsLUTQick=0;var tree=new TreeNode;for(i=0;i<codeTable.length;i++){if(codeTable[i]!==undefined){numBitsLUT=Math.max(numBitsLUT,codeTable[i].first)}}if(numBitsLUT>=BITS_MAX){numBitsLUTQick=BITS_MAX}else{numBitsLUTQick=numBitsLUT}var decodeLut=[],entry,code,numEntries,jj,currentBit,node;for(i=i0;i<i1;i++){j=i-(i<size?0:size);len=codeTable[j].first;if(len>0){entry=[len,j];if(len<=numBitsLUTQick){code=codeTable[j].second<<numBitsLUTQick-len;numEntries=1<<numBitsLUTQick-len;for(k=0;k<numEntries;k++){decodeLut[code|k]=entry}}else{code=codeTable[j].second;node=tree;for(jj=len-1;jj>=0;jj--){currentBit=code>>>jj&1;if(currentBit){if(!node.right){node.right=new TreeNode}node=node.right}else{if(!node.left){node.left=new TreeNode}node=node.left}if(jj===0&&!node.val){node.val=entry[1]}}}}}return{decodeLut:decodeLut,numBitsLUTQick:numBitsLUTQick,numBitsLUT:numBitsLUT,tree:tree,stuffedData:stuffedData,srcPtr:srcPtr,bitPos:bitPos}},readHuffman:function(input,data,OutPixelTypeArray,useBSQForOutputDim){var headerInfo=data.headerInfo;var numDims=headerInfo.numDims;var height=data.headerInfo.height;var width=data.headerInfo.width;var numPixels=width*height;var huffmanInfo=this.readHuffmanTree(input,data);var decodeLut=huffmanInfo.decodeLut;var tree=huffmanInfo.tree;var stuffedData=huffmanInfo.stuffedData;var srcPtr=huffmanInfo.srcPtr;var bitPos=huffmanInfo.bitPos;var numBitsLUTQick=huffmanInfo.numBitsLUTQick;var numBitsLUT=huffmanInfo.numBitsLUT;var offset=data.headerInfo.imageType===0?128:0;var node,val,delta,mask=data.pixels.resultMask,valTmp,valTmpQuick,currentBit;var i,j,k,ii;var prevVal=0;if(bitPos>0){srcPtr++;bitPos=0}var word=stuffedData[srcPtr];var deltaEncode=data.encodeMode===1;var resultPixelsAllDim=new OutPixelTypeArray(numPixels*numDims);var resultPixels=resultPixelsAllDim;var iDim;if(numDims<2||deltaEncode){for(iDim=0;iDim<numDims;iDim++){if(numDims>1){resultPixels=new OutPixelTypeArray(resultPixelsAllDim.buffer,numPixels*iDim,numPixels);prevVal=0}if(data.headerInfo.numValidPixel===width*height){for(k=0,i=0;i<height;i++){for(j=0;j<width;j++,k++){val=0;valTmp=word<<bitPos>>>32-numBitsLUTQick;valTmpQuick=valTmp;if(32-bitPos<numBitsLUTQick){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUTQick;valTmpQuick=valTmp}if(decodeLut[valTmpQuick]){val=decodeLut[valTmpQuick][1];bitPos+=decodeLut[valTmpQuick][0]}else{valTmp=word<<bitPos>>>32-numBitsLUT;valTmpQuick=valTmp;if(32-bitPos<numBitsLUT){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUT;valTmpQuick=valTmp}node=tree;for(ii=0;ii<numBitsLUT;ii++){currentBit=valTmp>>>numBitsLUT-ii-1&1;node=currentBit?node.right:node.left;if(!(node.left||node.right)){val=node.val;bitPos=bitPos+ii+1;break}}}if(bitPos>=32){bitPos-=32;srcPtr++;word=stuffedData[srcPtr]}delta=val-offset;if(deltaEncode){if(j>0){delta+=prevVal}else if(i>0){delta+=resultPixels[k-width]}else{delta+=prevVal}delta&=255;resultPixels[k]=delta;prevVal=delta}else{resultPixels[k]=delta}}}}else{for(k=0,i=0;i<height;i++){for(j=0;j<width;j++,k++){if(mask[k]){val=0;valTmp=word<<bitPos>>>32-numBitsLUTQick;valTmpQuick=valTmp;if(32-bitPos<numBitsLUTQick){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUTQick;valTmpQuick=valTmp}if(decodeLut[valTmpQuick]){val=decodeLut[valTmpQuick][1];bitPos+=decodeLut[valTmpQuick][0]}else{valTmp=word<<bitPos>>>32-numBitsLUT;valTmpQuick=valTmp;if(32-bitPos<numBitsLUT){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUT;valTmpQuick=valTmp}node=tree;for(ii=0;ii<numBitsLUT;ii++){currentBit=valTmp>>>numBitsLUT-ii-1&1;node=currentBit?node.right:node.left;if(!(node.left||node.right)){val=node.val;bitPos=bitPos+ii+1;break}}}if(bitPos>=32){bitPos-=32;srcPtr++;word=stuffedData[srcPtr]}delta=val-offset;if(deltaEncode){if(j>0&&mask[k-1]){delta+=prevVal}else if(i>0&&mask[k-width]){delta+=resultPixels[k-width]}else{delta+=prevVal}delta&=255;resultPixels[k]=delta;prevVal=delta}else{resultPixels[k]=delta}}}}}}}else{for(k=0,i=0;i<height;i++){for(j=0;j<width;j++){k=i*width+j;if(!mask||mask[k]){for(iDim=0;iDim<numDims;iDim++,k+=numPixels){val=0;valTmp=word<<bitPos>>>32-numBitsLUTQick;valTmpQuick=valTmp;if(32-bitPos<numBitsLUTQick){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUTQick;valTmpQuick=valTmp}if(decodeLut[valTmpQuick]){val=decodeLut[valTmpQuick][1];bitPos+=decodeLut[valTmpQuick][0]}else{valTmp=word<<bitPos>>>32-numBitsLUT;valTmpQuick=valTmp;if(32-bitPos<numBitsLUT){valTmp|=stuffedData[srcPtr+1]>>>64-bitPos-numBitsLUT;valTmpQuick=valTmp}node=tree;for(ii=0;ii<numBitsLUT;ii++){currentBit=valTmp>>>numBitsLUT-ii-1&1;node=currentBit?node.right:node.left;if(!(node.left||node.right)){val=node.val;bitPos=bitPos+ii+1;break}}}if(bitPos>=32){bitPos-=32;srcPtr++;word=stuffedData[srcPtr]}delta=val-offset;resultPixels[k]=delta}}}}}data.ptr=data.ptr+(srcPtr+1)*4+(bitPos>0?4:0);data.pixels.resultPixels=resultPixelsAllDim;if(numDims>1&&!useBSQForOutputDim){data.pixels.resultPixels=Lerc2Helpers.swapDimensionOrder(resultPixelsAllDim,numPixels,numDims,OutPixelTypeArray)}},decodeBits:function(input,data,blockDataBuffer,offset,iDim){{var headerInfo=data.headerInfo;var fileVersion=headerInfo.fileVersion;var blockPtr=0;var viewByteLength=input.byteLength-data.ptr>=5?5:input.byteLength-data.ptr;var view=new DataView(input,data.ptr,viewByteLength);var headerByte=view.getUint8(0);blockPtr++;var bits67=headerByte>>6;var n=bits67===0?4:3-bits67;var doLut=(headerByte&32)>0?true:false;var numBits=headerByte&31;var numElements=0;if(n===1){numElements=view.getUint8(blockPtr);blockPtr++}else if(n===2){numElements=view.getUint16(blockPtr,true);blockPtr+=2}else if(n===4){numElements=view.getUint32(blockPtr,true);blockPtr+=4}else{throw"Invalid valid pixel count type"}var scale=2*headerInfo.maxZError;var stuffedData,arrayBuf,store8,dataBytes,dataWords;var lutArr,lutData,lutBytes,lutBitsPerElement,bitsPerPixel;var zMax=headerInfo.numDims>1?headerInfo.maxValues[iDim]:headerInfo.zMax;if(doLut){data.counter.lut++;lutBytes=view.getUint8(blockPtr);lutBitsPerElement=numBits;blockPtr++;dataBytes=Math.ceil((lutBytes-1)*numBits/8);dataWords=Math.ceil(dataBytes/4);arrayBuf=new ArrayBuffer(dataWords*4);store8=new Uint8Array(arrayBuf);data.ptr+=blockPtr;store8.set(new Uint8Array(input,data.ptr,dataBytes));lutData=new Uint32Array(arrayBuf);data.ptr+=dataBytes;bitsPerPixel=0;while(lutBytes-1>>>bitsPerPixel){bitsPerPixel++}dataBytes=Math.ceil(numElements*bitsPerPixel/8);dataWords=Math.ceil(dataBytes/4);arrayBuf=new ArrayBuffer(dataWords*4);store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,data.ptr,dataBytes));stuffedData=new Uint32Array(arrayBuf);data.ptr+=dataBytes;if(fileVersion>=3){lutArr=BitStuffer.unstuffLUT2(lutData,numBits,lutBytes-1,offset,scale,zMax)}else{lutArr=BitStuffer.unstuffLUT(lutData,numBits,lutBytes-1,offset,scale,zMax)}if(fileVersion>=3){BitStuffer.unstuff2(stuffedData,blockDataBuffer,bitsPerPixel,numElements,lutArr)}else{BitStuffer.unstuff(stuffedData,blockDataBuffer,bitsPerPixel,numElements,lutArr)}}else{data.counter.bitstuffer++;bitsPerPixel=numBits;data.ptr+=blockPtr;if(bitsPerPixel>0){dataBytes=Math.ceil(numElements*bitsPerPixel/8);dataWords=Math.ceil(dataBytes/4);arrayBuf=new ArrayBuffer(dataWords*4);store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,data.ptr,dataBytes));stuffedData=new Uint32Array(arrayBuf);data.ptr+=dataBytes;if(fileVersion>=3){if(offset==null){BitStuffer.originalUnstuff2(stuffedData,blockDataBuffer,bitsPerPixel,numElements)}else{BitStuffer.unstuff2(stuffedData,blockDataBuffer,bitsPerPixel,numElements,false,offset,scale,zMax)}}else{if(offset==null){BitStuffer.originalUnstuff(stuffedData,blockDataBuffer,bitsPerPixel,numElements)}else{BitStuffer.unstuff(stuffedData,blockDataBuffer,bitsPerPixel,numElements,false,offset,scale,zMax)}}}}}},readTiles:function(input,data,OutPixelTypeArray,useBSQForOutputDim){var headerInfo=data.headerInfo;var width=headerInfo.width;var height=headerInfo.height;var numPixels=width*height;var microBlockSize=headerInfo.microBlockSize;var imageType=headerInfo.imageType;var dataTypeSize=Lerc2Helpers.getDataTypeSize(imageType);var numBlocksX=Math.ceil(width/microBlockSize);var numBlocksY=Math.ceil(height/microBlockSize);data.pixels.numBlocksY=numBlocksY;data.pixels.numBlocksX=numBlocksX;data.pixels.ptr=0;var row=0,col=0,blockY=0,blockX=0,thisBlockHeight=0,thisBlockWidth=0,bytesLeft=0,headerByte=0,bits67=0,testCode=0,outPtr=0,outStride=0,numBytes=0,bytesleft=0,z=0,blockPtr=0;var view,block,arrayBuf,store8,rawData;var blockEncoding;var blockDataBuffer=new OutPixelTypeArray(microBlockSize*microBlockSize);var lastBlockHeight=height%microBlockSize||microBlockSize;var lastBlockWidth=width%microBlockSize||microBlockSize;var offsetType,offset;var numDims=headerInfo.numDims,iDim;var mask=data.pixels.resultMask;var resultPixels=data.pixels.resultPixels;var fileVersion=headerInfo.fileVersion;var fileVersionCheckNum=fileVersion>=5?14:15;var isDiffEncoding;var zMax=headerInfo.zMax;var resultPixelsPrevDim;for(blockY=0;blockY<numBlocksY;blockY++){thisBlockHeight=blockY!==numBlocksY-1?microBlockSize:lastBlockHeight;for(blockX=0;blockX<numBlocksX;blockX++){thisBlockWidth=blockX!==numBlocksX-1?microBlockSize:lastBlockWidth;outPtr=blockY*width*microBlockSize+blockX*microBlockSize;outStride=width-thisBlockWidth;for(iDim=0;iDim<numDims;iDim++){if(numDims>1){resultPixelsPrevDim=resultPixels;outPtr=blockY*width*microBlockSize+blockX*microBlockSize;resultPixels=new OutPixelTypeArray(data.pixels.resultPixels.buffer,numPixels*iDim*dataTypeSize,numPixels);zMax=headerInfo.maxValues[iDim]}else{resultPixelsPrevDim=null}bytesLeft=input.byteLength-data.ptr;view=new DataView(input,data.ptr,Math.min(10,bytesLeft));block={};blockPtr=0;headerByte=view.getUint8(0);blockPtr++;isDiffEncoding=headerInfo.fileVersion>=5?headerByte&4:0;bits67=headerByte>>6&255;testCode=headerByte>>2&fileVersionCheckNum;if(testCode!==(blockX*microBlockSize>>3&fileVersionCheckNum)){throw"integrity issue"}if(isDiffEncoding&&iDim===0){throw"integrity issue"}blockEncoding=headerByte&3;if(blockEncoding>3){data.ptr+=blockPtr;throw"Invalid block encoding ("+blockEncoding+")"}else if(blockEncoding===2){if(isDiffEncoding){if(mask){for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){if(mask[outPtr]){resultPixels[outPtr]=resultPixelsPrevDim[outPtr]}outPtr++}}}else{for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){resultPixels[outPtr]=resultPixelsPrevDim[outPtr];outPtr++}}}}data.counter.constant++;data.ptr+=blockPtr;continue}else if(blockEncoding===0){if(isDiffEncoding){throw"integrity issue"}data.counter.uncompressed++;data.ptr+=blockPtr;numBytes=thisBlockHeight*thisBlockWidth*dataTypeSize;bytesleft=input.byteLength-data.ptr;numBytes=numBytes<bytesleft?numBytes:bytesleft;arrayBuf=new ArrayBuffer(numBytes%dataTypeSize===0?numBytes:numBytes+dataTypeSize-numBytes%dataTypeSize);store8=new Uint8Array(arrayBuf);store8.set(new Uint8Array(input,data.ptr,numBytes));rawData=new OutPixelTypeArray(arrayBuf);z=0;if(mask){for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){if(mask[outPtr]){resultPixels[outPtr]=rawData[z++]}outPtr++}outPtr+=outStride}}else{for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){resultPixels[outPtr++]=rawData[z++]}outPtr+=outStride}}data.ptr+=z*dataTypeSize}else{offsetType=Lerc2Helpers.getDataTypeUsed(isDiffEncoding&&imageType<6?4:imageType,bits67);offset=Lerc2Helpers.getOnePixel(block,blockPtr,offsetType,view);blockPtr+=Lerc2Helpers.getDataTypeSize(offsetType);if(blockEncoding===3){data.ptr+=blockPtr;data.counter.constantoffset++;if(mask){for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){if(mask[outPtr]){resultPixels[outPtr]=isDiffEncoding?Math.min(zMax,resultPixelsPrevDim[outPtr]+offset):offset}outPtr++}outPtr+=outStride}}else{for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){resultPixels[outPtr]=isDiffEncoding?Math.min(zMax,resultPixelsPrevDim[outPtr]+offset):offset;outPtr++}outPtr+=outStride}}}else{data.ptr+=blockPtr;Lerc2Helpers.decodeBits(input,data,blockDataBuffer,offset,iDim);blockPtr=0;if(isDiffEncoding){if(mask){for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){if(mask[outPtr]){resultPixels[outPtr]=blockDataBuffer[blockPtr++]+resultPixelsPrevDim[outPtr]}outPtr++}outPtr+=outStride}}else{for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){resultPixels[outPtr]=blockDataBuffer[blockPtr++]+resultPixelsPrevDim[outPtr];outPtr++}outPtr+=outStride}}}else if(mask){for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){if(mask[outPtr]){resultPixels[outPtr]=blockDataBuffer[blockPtr++]}outPtr++}outPtr+=outStride}}else{for(row=0;row<thisBlockHeight;row++){for(col=0;col<thisBlockWidth;col++){resultPixels[outPtr++]=blockDataBuffer[blockPtr++]}outPtr+=outStride}}}}}}}if(numDims>1&&!useBSQForOutputDim){data.pixels.resultPixels=Lerc2Helpers.swapDimensionOrder(data.pixels.resultPixels,numPixels,numDims,OutPixelTypeArray)}},formatFileInfo:function(data){return{fileIdentifierString:data.headerInfo.fileIdentifierString,fileVersion:data.headerInfo.fileVersion,imageType:data.headerInfo.imageType,height:data.headerInfo.height,width:data.headerInfo.width,numValidPixel:data.headerInfo.numValidPixel,microBlockSize:data.headerInfo.microBlockSize,blobSize:data.headerInfo.blobSize,maxZError:data.headerInfo.maxZError,pixelType:Lerc2Helpers.getPixelType(data.headerInfo.imageType),eofOffset:data.eofOffset,mask:data.mask?{numBytes:data.mask.numBytes}:null,pixels:{numBlocksX:data.pixels.numBlocksX,numBlocksY:data.pixels.numBlocksY,maxValue:data.headerInfo.zMax,minValue:data.headerInfo.zMin,noDataValue:data.noDataValue}}},constructConstantSurface:function(data,useBSQForOutputDim){var val=data.headerInfo.zMax;var valMin=data.headerInfo.zMin;var maxValues=data.headerInfo.maxValues;var numDims=data.headerInfo.numDims;var numPixels=data.headerInfo.height*data.headerInfo.width;var i=0,k=0,nStart=0;var mask=data.pixels.resultMask;var resultPixels=data.pixels.resultPixels;if(mask){if(numDims>1){if(useBSQForOutputDim){for(i=0;i<numDims;i++){nStart=i*numPixels;val=maxValues[i];for(k=0;k<numPixels;k++){if(mask[k]){resultPixels[nStart+k]=val}}}}else{for(k=0;k<numPixels;k++){if(mask[k]){nStart=k*numDims;for(i=0;i<numDims;i++){resultPixels[nStart+numDims]=maxValues[i]}}}}}else{for(k=0;k<numPixels;k++){if(mask[k]){resultPixels[k]=val}}}}else{if(numDims>1&&valMin!==val){if(useBSQForOutputDim){for(i=0;i<numDims;i++){nStart=i*numPixels;val=maxValues[i];for(k=0;k<numPixels;k++){resultPixels[nStart+k]=val}}}else{for(k=0;k<numPixels;k++){nStart=k*numDims;for(i=0;i<numDims;i++){resultPixels[nStart+i]=maxValues[i]}}}}else{for(k=0;k<numPixels*numDims;k++){resultPixels[k]=val}}}return},getDataTypeArray:function(t){var tp;switch(t){case 0:tp=Int8Array;break;case 1:tp=Uint8Array;break;case 2:tp=Int16Array;break;case 3:tp=Uint16Array;break;case 4:tp=Int32Array;break;case 5:tp=Uint32Array;break;case 6:tp=Float32Array;break;case 7:tp=Float64Array;break;default:tp=Float32Array}return tp},getPixelType:function(t){var tp;switch(t){case 0:tp="S8";break;case 1:tp="U8";break;case 2:tp="S16";break;case 3:tp="U16";break;case 4:tp="S32";break;case 5:tp="U32";break;case 6:tp="F32";break;case 7:tp="F64";break;default:tp="F32"}return tp},isValidPixelValue:function(t,val){if(val==null){return false}var isValid;switch(t){case 0:isValid=val>=-128&&val<=127;break;case 1:isValid=val>=0&&val<=255;break;case 2:isValid=val>=-32768&&val<=32767;break;case 3:isValid=val>=0&&val<=65536;break;case 4:isValid=val>=-2147483648&&val<=2147483647;break;case 5:isValid=val>=0&&val<=4294967296;break;case 6:isValid=val>=-34027999387901484e22&&val<=34027999387901484e22;break;case 7:isValid=val>=-17976931348623157e292&&val<=17976931348623157e292;break;default:isValid=false}return isValid},getDataTypeSize:function(t){var s=0;switch(t){case 0:case 1:s=1;break;case 2:case 3:s=2;break;case 4:case 5:case 6:s=4;break;case 7:s=8;break;default:s=t}return s},getDataTypeUsed:function(dt,tc){var t=dt;switch(dt){case 2:case 4:t=dt-tc;break;case 3:case 5:t=dt-2*tc;break;case 6:if(0===tc){t=dt}else if(1===tc){t=2}else{t=1}break;case 7:if(0===tc){t=dt}else{t=dt-2*tc+1}break;default:t=dt;break}return t},getOnePixel:function(block,blockPtr,offsetType,view){var temp=0;switch(offsetType){case 0:temp=view.getInt8(blockPtr);break;case 1:temp=view.getUint8(blockPtr);break;case 2:temp=view.getInt16(blockPtr,true);break;case 3:temp=view.getUint16(blockPtr,true);break;case 4:temp=view.getInt32(blockPtr,true);break;case 5:temp=view.getUInt32(blockPtr,true);break;case 6:temp=view.getFloat32(blockPtr,true);break;case 7:temp=view.getFloat64(blockPtr,true);break;default:throw"the decoder does not understand this pixel type"}return temp},swapDimensionOrder:function(pixels,numPixels,numDims,OutPixelTypeArray,inputIsBIP){var i=0,j=0,iDim=0,temp=0,swap=pixels;if(numDims>1){swap=new OutPixelTypeArray(numPixels*numDims);if(inputIsBIP){for(i=0;i<numPixels;i++){temp=i;for(iDim=0;iDim<numDims;iDim++,temp+=numPixels){swap[temp]=pixels[j++]}}}else{for(i=0;i<numPixels;i++){temp=i;for(iDim=0;iDim<numDims;iDim++,temp+=numPixels){swap[j++]=pixels[temp]}}}}return swap}};var TreeNode=function(val,left,right){this.val=val;this.left=left;this.right=right};var Lerc2Decode={decode:function(input,options){options=options||{};var noDataValue=options.noDataValue;var i=0,data={};data.ptr=options.inputOffset||0;data.pixels={};if(!Lerc2Helpers.readHeaderInfo(input,data)){return}var headerInfo=data.headerInfo;var fileVersion=headerInfo.fileVersion;var OutPixelTypeArray=Lerc2Helpers.getDataTypeArray(headerInfo.imageType);if(fileVersion>5){throw"unsupported lerc version 2."+fileVersion}Lerc2Helpers.readMask(input,data);if(headerInfo.numValidPixel!==headerInfo.width*headerInfo.height&&!data.pixels.resultMask){data.pixels.resultMask=options.maskData}var numPixels=headerInfo.width*headerInfo.height;data.pixels.resultPixels=new OutPixelTypeArray(numPixels*headerInfo.numDims);data.counter={onesweep:0,uncompressed:0,lut:0,bitstuffer:0,constant:0,constantoffset:0};var useBSQForOutputDim=!options.returnPixelInterleavedDims;if(headerInfo.numValidPixel!==0){if(headerInfo.zMax===headerInfo.zMin){Lerc2Helpers.constructConstantSurface(data,useBSQForOutputDim)}else if(fileVersion>=4&&Lerc2Helpers.checkMinMaxRanges(input,data)){Lerc2Helpers.constructConstantSurface(data,useBSQForOutputDim)}else{var view=new DataView(input,data.ptr,2);var bReadDataOneSweep=view.getUint8(0);data.ptr++;if(bReadDataOneSweep){Lerc2Helpers.readDataOneSweep(input,data,OutPixelTypeArray,useBSQForOutputDim)}else{if(fileVersion>1&&headerInfo.imageType<=1&&Math.abs(headerInfo.maxZError-.5)<1e-5){var flagHuffman=view.getUint8(1);data.ptr++;data.encodeMode=flagHuffman;if(flagHuffman>2||fileVersion<4&&flagHuffman>1){throw"Invalid Huffman flag "+flagHuffman}if(flagHuffman){Lerc2Helpers.readHuffman(input,data,OutPixelTypeArray,useBSQForOutputDim)}else{Lerc2Helpers.readTiles(input,data,OutPixelTypeArray,useBSQForOutputDim)}}else{Lerc2Helpers.readTiles(input,data,OutPixelTypeArray,useBSQForOutputDim)}}}}data.eofOffset=data.ptr;var diff;if(options.inputOffset){diff=data.headerInfo.blobSize+options.inputOffset-data.ptr;if(Math.abs(diff)>=1){data.eofOffset=options.inputOffset+data.headerInfo.blobSize}}else{diff=data.headerInfo.blobSize-data.ptr;if(Math.abs(diff)>=1){data.eofOffset=data.headerInfo.blobSize}}var result={width:headerInfo.width,height:headerInfo.height,pixelData:data.pixels.resultPixels,minValue:headerInfo.zMin,maxValue:headerInfo.zMax,validPixelCount:headerInfo.numValidPixel,dimCount:headerInfo.numDims,dimStats:{minValues:headerInfo.minValues,maxValues:headerInfo.maxValues},maskData:data.pixels.resultMask};if(data.pixels.resultMask&&Lerc2Helpers.isValidPixelValue(headerInfo.imageType,noDataValue)){var 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result=lerc.decode(encodedData,{inputOffset:inputOffset,encodedMaskData:encodedMaskData,maskData:maskData,returnMask:iPlane===0?true:false,returnEncodedMask:iPlane===0?true:false,returnFileInfo:true,returnPixelInterleavedDims:options.returnPixelInterleavedDims,pixelType:options.pixelType||null,noDataValue:options.noDataValue||null});inputOffset=result.fileInfo.eofOffset;maskData=result.maskData;if(iPlane===0){encodedMaskData=result.encodedMaskData;decodedPixelBlock.width=result.width;decodedPixelBlock.height=result.height;decodedPixelBlock.dimCount=result.dimCount||1;decodedPixelBlock.pixelType=result.pixelType||result.fileInfo.pixelType;decodedPixelBlock.mask=maskData}if(majorVersion>1){if(maskData){bandMasks.push(maskData)}if(result.fileInfo.mask&&result.fileInfo.mask.numBytes>0){uniqueBandMaskCount++}}iPlane++;decodedPixelBlock.pixels.push(result.pixelData);decodedPixelBlock.statistics.push({minValue:result.minValue,maxValue:result.maxValue,noDataValue:result.noDataValue,dimStats:result.dimStats})}var i,j,numPixels;if(majorVersion>1&&uniqueBandMaskCount>1){numPixels=decodedPixelBlock.width*decodedPixelBlock.height;decodedPixelBlock.bandMasks=bandMasks;maskData=new Uint8Array(numPixels);maskData.set(bandMasks[0]);for(i=1;i<bandMasks.length;i++){bandMask=bandMasks[i];for(j=0;j<numPixels;j++){maskData[j]=maskData[j]&bandMask[j]}}decodedPixelBlock.maskData=maskData}return decodedPixelBlock}};if(typeof define==="function"&&define.amd){define([],function(){return Lerc})}else if(typeof module!=="undefined"&&module.exports){module.exports=Lerc}else{this.Lerc=Lerc}})();
+/*! Lerc 4.0
+Copyright 2015 - 2022 Esri
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+A local copy of the license and additional notices are located with the
+source distribution at:
+http://github.com/Esri/lerc/
+Contributors:  Thomas Maurer, Wenxue Ju
+*/
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).Lerc={})}(this,(function(t){"use strict";var e,n=(e="undefined"==typeof document&&"undefined"==typeof location?new(require("url").URL)("file:"+__filename).href:"undefined"==typeof document?location.href:document.currentScript&&document.currentScript.src||new URL("LercDecode.js",document.baseURI).href,function(t){var n,r;(t=void 0!==(t=t||{})?t:{}).ready=new Promise((function(t,e){n=t,r=e}));var i,o,a,s,u,c,f=Object.assign({},t),l="object"==typeof window,p="function"==typeof importScripts,d="object"==typeof process&&"object"==typeof process.versions&&"string"==typeof process.versions.node,h="";d?(h=p?require("path").dirname(h)+"/":__dirname+"/",c=()=>{u||(s=require("fs"),u=require("path"))},i=function(t,e){return c(),t=u.normalize(t),s.readFileSync(t,e?void 0:"utf8")},a=t=>{var e=i(t,!0);return e.buffer||(e=new Uint8Array(e)),e},o=(t,e,n)=>{c(),t=u.normalize(t),s.readFile(t,(function(t,r){t?n(t):e(r.buffer)}))},process.argv.length>1&&process.argv[1].replace(/\\/g,"/"),process.argv.slice(2),process.on("uncaughtException",(function(t){if(!(t instanceof X))throw t})),process.on("unhandledRejection",(function(t){throw t})),t.inspect=function(){return"[Emscripten Module object]"}):(l||p)&&(p?h=self.location.href:"undefined"!=typeof document&&document.currentScript&&(h=document.currentScript.src),e&&(h=e),h=0!==h.indexOf("blob:")?h.substr(0,h.replace(/[?#].*/,"").lastIndexOf("/")+1):"",i=t=>{var e=new XMLHttpRequest;return e.open("GET",t,!1),e.send(null),e.responseText},p&&(a=t=>{var e=new XMLHttpRequest;return e.open("GET",t,!1),e.responseType="arraybuffer",e.send(null),new Uint8Array(e.response)}),o=(t,e,n)=>{var r=new XMLHttpRequest;r.open("GET",t,!0),r.responseType="arraybuffer",r.onload=()=>{200==r.status||0==r.status&&r.response?e(r.response):n()},r.onerror=n,r.send(null)}),t.print||console.log.bind(console);var y,m,g=t.printErr||console.warn.bind(console);Object.assign(t,f),f=null,t.arguments,t.thisProgram,t.quit,t.wasmBinary&&(y=t.wasmBinary),t.noExitRuntime,"object"!=typeof WebAssembly&&B("no native wasm support detected");var _,w,b,A,v,x,U=!1,R="undefined"!=typeof TextDecoder?new TextDecoder("utf8"):void 0;function I(t,e){return t?function(t,e,n){for(var r=e+n,i=e;t[i]&&!(i>=r);)++i;if(i-e>16&&t.buffer&&R)return R.decode(t.subarray(e,i));for(var o="";e<i;){var a=t[e++];if(128&a){var s=63&t[e++];if(192!=(224&a)){var u=63&t[e++];if((a=224==(240&a)?(15&a)<<12|s<<6|u:(7&a)<<18|s<<12|u<<6|63&t[e++])<65536)o+=String.fromCharCode(a);else{var c=a-65536;o+=String.fromCharCode(55296|c>>10,56320|1023&c)}}else o+=String.fromCharCode((31&a)<<6|s)}else o+=String.fromCharCode(a)}return o}(b,t,e):""}function S(e){_=e,t.HEAP8=w=new Int8Array(e),t.HEAP16=new Int16Array(e),t.HEAP32=A=new Int32Array(e),t.HEAPU8=b=new Uint8Array(e),t.HEAPU16=new Uint16Array(e),t.HEAPU32=v=new Uint32Array(e),t.HEAPF32=new Float32Array(e),t.HEAPF64=new Float64Array(e)}t.INITIAL_MEMORY;var T,C,D=[],E=[],P=[],F=0,j=null;function B(e){t.onAbort&&t.onAbort(e),g(e="Aborted("+e+")"),U=!0,e+=". 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D=_===h&&h>1?x:null,{pixelType:E}=b;return{width:p,height:d,pixelType:E,statistics:w,pixels:v,mask:S,dimCount:y,depthCount:m,bandMasks:D}},t.getBandCount=function(t,e={}){return c(t,e).bandCount},t.getBlobInfo=c,t.isLoaded=function(){return o},t.load=function(t={}){if(i)return i;const e=t.locateFile||((t,e)=>`${e}${t}`);return i=n({locateFile:e}).then((t=>t.ready.then((()=>{!function(t){const{_malloc:e,_free:n,_lerc_getBlobInfo:i,_lerc_getDataRanges:o,_lerc_decode_4D:u,asm:c}=t;let f;const l=Object.values(c).find((e=>e&&"buffer"in e&&e.buffer===t.HEAPU8.buffer)),p=t=>{const n=t.map((t=>16+(t>>3<<3))),r=n.reduce(((t,e)=>t+e)),i=e(r);f=new Uint8Array(l.buffer);let o=n[0];n[0]=i;for(let t=1;t<n.length;t++){const e=n[t];n[t]=n[t-1]+o,o=e}return n};a.getBlobInfo=t=>{const e=12,r=3,a=new Uint8Array(4*e),u=new Uint8Array(8*r),[c,d,h]=p([t.length,a.length,u.length]);f.set(t,c),f.set(a,d),f.set(u,h);let y=i(c,t.length,d,h,e,r);if(y)throw n(c),`lerc-getBlobInfo: error code is ${y}`;f=new Uint8Array(l.buffer),s(f,d,a),s(f,h,u);const m=new Uint32Array(a.buffer),g=new Float64Array(u.buffer),[_,w,b,A,v,x,U,R,I,S,T]=m,C={version:_,dimCount:b,width:A,height:v,validPixelCount:U,bandCount:x,blobSize:R,maskCount:I,depthCount:S,dataType:w,minValue:g[0],maxValue:g[1],maxZerror:g[2],statistics:[],bandCountWithNoData:T};if(T)return C;if(1===S&&1===x)return n(c),C.statistics.push({minValue:g[0],maxValue:g[1]}),C;const D=S*x*8,E=new Uint8Array(D),P=new Uint8Array(D);let F=c,j=0,B=0,L=!1;if(f.byteLength<c+2*D?(n(c),L=!0,[F,j,B]=p([t.length,D,D]),f.set(t,F)):[j,B]=p([D,D]),f.set(E,j),f.set(P,B),y=o(F,t.length,S,x,j,B),y)throw n(F),L||n(j),`lerc-getDataRanges: error code is ${y}`;f=new Uint8Array(l.buffer),s(f,j,E),s(f,B,P);const z=new Float64Array(E.buffer),M=new Float64Array(P.buffer),V=C.statistics;for(let t=0;t<x;t++)if(S>1){const e=z.slice(t*S,(t+1)*S),n=M.slice(t*S,(t+1)*S),r=Math.min.apply(null,e),i=Math.max.apply(null,n);V.push({minValue:r,maxValue:i,dimStats:{minValues:e,maxValues:n},depthStats:{minValues:e,maxValues:n}})}else V.push({minValue:z[t],maxValue:M[t]});return n(F),L||n(j),C},a.decode=(t,e)=>{const{maskCount:i,depthCount:o,bandCount:a,width:c,height:d,dataType:h,bandCountWithNoData:y}=e,m=r[h],g=c*d,_=new Uint8Array(g*a),w=g*o*a*m.size,b=new Uint8Array(w),A=new Uint8Array(a),v=new Uint8Array(8*a),[x,U,R,I,S]=p([t.length,_.length,b.length,A.length,v.length]);f.set(t,x),f.set(_,U),f.set(b,R),f.set(A,I),f.set(v,S);const T=u(x,t.length,i,U,o,c,d,a,h,R,I,S);if(T)throw n(x),`lerc-decode: error code is ${T}`;f=new Uint8Array(l.buffer),s(f,R,b),s(f,U,_);let C=null;if(y){s(f,I,A),s(f,S,v),C=[];const t=new Float64Array(v.buffer);for(let e=0;e<A.length;e++)C.push(A[e]?t[e]:null)}return n(x),{data:b,maskData:_,noDataValues:C}}}(t),o=!0})))),i},Object.defineProperty(t,"__esModule",{value:!0})}));

package.json

 {
   "name": "lerc",
+  "version": "4.0.0",
   "browser": "LercDecode.js",
@@ -8,19 +9,12 @@ "bugs": {
   "description": "Rapid decoding of Lerc compressed raster data for any standard pixel type.",
-  "version": "3.0.0",
+  "keywords": [
+    "Esri",
+    "LERC"
+  ],
   "author": "Esri <[e-mail]> (http://developers.arcgis.com)",
   "contributors": [
-    "Johannes Schmid",
-    "Chayanika Khatua",
+    "Thomas Maurer",
     "Wenxue Ju"
   ],
-  "devDependencies": {
-    "gh-release": "^2.2.1",
-    "jsdoc-to-markdown": "^2.0.1",
-    "jshint": "^2.13.0",
-    "uglify-js": "^3.14.0"
-  },
-  "files": [
-    "LercDecode.js",
-    "LercDecode.min.js"
-  ],
+  "devDependencies": {},
   "homepage": "https://github.com/Esri/lerc",
@@ -34,8 +28,4 @@ "license": "Apache-2.0",
   },
-  "scripts": {
-    "lint": "jshint LercDecode.js",
-    "build": "uglifyjs LercDecode.js -o LercDecode.min.js --comments",
-    "docs": "jsdoc2md --template README.hbs --files LercDecode.js",
-    "release": "./release.sh"
-  }
-}
+  "scripts": {},
+  "dependencies": {}
+}

README.md

@@ -8,4 +8,8 @@ [![npm version][npm-img]][npm-url]
 
-> Rapid decoding of Lerc compressed raster data for any standard pixel type, not just rgb or byte
+> Rapid decoding of Lerc compressed raster data for any standard pixel type, not just rgb or byte.
 
+# Breaking changes
+- [Web Assembly](https://caniuse.com/wasm) support is now required.
+- <code>Lerc.load()</code> must be invoked and the returned promise must be resolved prior to <code>Lerc.decode</code>. This only needs to be done once per worker (or the main thread). There's no extra cost when invoked multiple times as the internal wasm loading promise is cached.
+
 ## Browser
@@ -17,6 +21,10 @@
 ```js
-Lerc.decode(xhrResponse, {
+await Lerc.load();
+
+const pixelBlock = Lerc.decode(arrayBuffer);
+
+// use options
+const pixelBlock = Lerc.decode(arrayBuffer, {
   inputOffset: 10, // start from the 10th byte (default is 0)
-  pixelType: "U8", // only needed for lerc1 (default is F32)
-  returnPixelInterleavedDims: false // only applicable to n-dim lerc2 blobs (default is false)
+  returnInterleaved: true // only applicable to n-depth lerc2 blobs (default is false)
 });
@@ -28,6 +36,6 @@ ```
 ```js
-npm install lerc && npm install node-fetch
+npm install lerc && npm install node-fetch-commonjs
 ```
 ```js
-const fetch = require('node-fetch');
+const fetch = require('node-fetch-commonjs');
 const Lerc = require('lerc');
@@ -37,5 +45,6 @@
   .then(response => response.arrayBuffer())
-  .then(body => {
-    const image = Lerc.decode(body);
-    image.width // 257
+  .then(async (body) => {
+    // on demand load here (internally it's only loading once)
+    const image = await Lerc.load().then(() => Lerc.decode(body));
+    console.log(image.width); // 257
   });
@@ -49,8 +58,21 @@ ```
 ## Lerc
-a module for decoding LERC blobs
+A module for decoding LERC blobs.
 
+<a name="exp_module_Lerc--load"></a>
+
+### load([options]) ⇒ <code>Promise<void></code> ⏏
+Load the depencies (web assembly). Check whether dependencies has been loaded using <code>Lerc.isLoaded</code>. The loading promise is cached so it can be invoked multiple times if needed.
+
+
+**Kind**: Exported function
+
+| Param | Type | Description |
+| --- | --- | --- |
+| [options.locateFile] | <code>(wasmFileName?: string, scriptDir?: string) => string</code> | The function to locate lerc-wasm.wasm. Used when the web assembly file is moved to a different location. |
+
+
 <a name="exp_module_Lerc--decode"></a>
 
 ### decode(input, [options]) ⇒ <code>Object</code> ⏏
-A wrapper for decoding both LERC1 and LERC2 byte streams capable of handling multiband pixel blocks for various pixel types.
+A function for decoding both LERC1 and LERC2 byte streams capable of handling multiband pixel blocks for various pixel types.
 
@@ -64,4 +86,5 @@ **Kind**: Exported function
 | [options.inputOffset] | <code>number</code> | The number of bytes to skip in the input byte stream. A valid Lerc file is expected at that position. |
-| [options.pixelType] | <code>string</code> | (LERC1 only) Default value is F32. Valid pixel types for input are U8/S8/S16/U16/S32/U32/F32. |
-| [options.noDataValue] | <code>number</code> | (LERC1 only). It is recommended to use the returned mask instead of setting this value. |
+| [options.noDataValue] | <code>number</code> | It is recommended to use the returned mask instead of setting this value. |
+| (Deprecated) [options.returnPixelInterleavedDims] | <code>boolean</code> | will be removed in next release, use returnInterleaved instead. |
+| [options.returnInterleaved] | <code>boolean</code> | (ndepth LERC2 only) If true, returned depth values are pixel-interleaved. |
 
@@ -74,6 +97,9 @@ **Result Object Properties**
 | height | <code>number</code> | Height of decoded image. |
-| pixels | <code>array</code> | [band1, band2, …] Each band is a typed array of width*height. |
+| pixels | <code>array</code> | [band1, band2, …] Each band is a typed array of width * height * depthCount. |
 | pixelType | <code>string</code> | The type of pixels represented in the output. |
 | mask | <code>mask</code> | Typed array with a size of width*height, or null if all pixels are valid. |
 | statistics | <code>array</code> | [statistics_band1, statistics_band2, …] Each element is a statistics object representing min and max values |
+| (Deprecated) dimCount | <code>number</code> | Will be removed in next release, use <code>depthCount</code> instead.
+| depthCount | <code>number</code> | Depth count
+| [bandMasks] | <code>array</code> | [band1_mask, band2_mask, …] Each band is a Uint8Array of width * height * depthCount.  |
 
@@ -84,3 +110,3 @@ * * *
 
-Copyright &copy; 2017-2021 Esri
+Copyright &copy; 2017-2022 Esri
 
@@ -87,0 +113,0 @@ Licensed under the Apache License, Version 2.0 (the "License");

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