65 lines
2.7 KiB
Plaintext
65 lines
2.7 KiB
Plaintext
import dicomParser from "dicom-parser";
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import dcmjs from 'dcmjs'
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const CharLs = require('@cornerstonejs/codec-charls')
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const codecWrapper = {
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codec: undefined,
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Decoder: undefined,
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Encoder: undefined,
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encoderName: "JpegLSEncoder",
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decoderName: "JpegLSDecoder",
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};
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function setCodec(codecConfig, encoderName, decoderName, codec = {}) {
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codecConfig.Encoder = codec[encoderName];
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codecConfig.Decoder = codec[decoderName];
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codecConfig.codec = codec;
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}
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CharLs().then(res => {
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setCodec(codecWrapper, codecWrapper.encoderName, codecWrapper.decoderName, res);
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})
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export const encoder = function (file) {
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return new Promise(async (resolve, reject) => {
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try {
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const reader = new FileReader()
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reader.onload = async (event) => {
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let buffer = event.target.result
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let data = dicomParser.parseDicom(new Uint8Array(buffer))
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let frameCount = data.string('x00280008')
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let height = data.uint16('x00280011')
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let width = data.uint16('x00280010')
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let bitsPerSample = data.uint16('x00280100')
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let componentCount = data.string('x00280004')
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let transportSyntax = data.string('x00020010')
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let dataset = dcmjs.data.DicomMessage.readFile(buffer)
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let pixelDataElement = data.elements.x7fe00010
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let pixelDataOffset = pixelDataElement.dataOffset
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let pixelDataLength = pixelDataElement.length
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let pixelDataBytes = data.byteArray.subarray(pixelDataOffset, pixelDataOffset + pixelDataLength)
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let image = "data:image/png;base64," + btoa(String.fromCharCode.apply(null, pixelDataBytes));
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if ((transportSyntax === '1.2.840.10008.1.2.1' || transportSyntax === '1.2.840.10008.1.2') && ~componentCount.indexOf('MONOCHROME') && !frameCount) {
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let encoder = new codecWrapper.Encoder()
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let decodedBytes = encoder.getDecodedBuffer({width: width, height: height, bitsPerSample: bitsPerSample, componentCount: 1})
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encoder.setNearLossless(0)
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decodedBytes.set(pixelDataBytes)
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encoder.encode()
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let encodedBytes = encoder.getEncodedBuffer();
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dataset.dict['7FE00010'].Value[0] = encodedBytes.buffer
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dataset.meta['00020010'].Value[0] = '1.2.840.10008.1.2.4.80'
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let newDicomFile = dataset.write()
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const bufferArray = new Uint8Array(newDicomFile)
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const blob = new Blob([bufferArray], { type: 'application/octet-stream' })
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resolve({blob, image})
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} else {
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const bufferArray = new Uint8Array(buffer);
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const blob = new Blob([bufferArray], { type: 'application/octet-stream' });
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resolve({blob, image})
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}
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};
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reader.readAsArrayBuffer(file);
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} catch (e) {
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console.log(e)
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reject(e)
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}
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})
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}
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