Re-add extensions as top level dir

extensions/ohif-dicom-pdf-extension/src/DicomPDFViewport.js

@@ -0,0 +1,83 @@
+import React, { Component } from 'react';
+import dicomParser from 'dicom-parser';
+import TypedArrayProp from './TypedArrayProp';
+
+// TODO: Should probably use dcmjs for this
+const SOP_CLASS_UIDS = {
+  ENCAPSULATED_PDF: '1.2.840.10008.5.1.4.1.1.104.1'
+};
+
+class DicomPDFViewport extends Component {
+  state = {
+    fileURL: null,
+    error: null
+  };
+
+  static propTypes = {
+    byteArray: TypedArrayProp.uint8
+  };
+
+  renderPDF = dataSet => {
+    const sopClassUid = dataSet.string('x00080016');
+
+    if (sopClassUid !== SOP_CLASS_UIDS.ENCAPSULATED_PDF) {
+      throw new Error('This is not a DICOM-encapsulated PDF');
+    }
+
+    const fileTag = dataSet.elements.x00420011;
+    const offset = fileTag.dataOffset;
+    const remainder = offset + fileTag.length;
+    const pdfByteArray = dataSet.byteArray.slice(offset, remainder);
+    const PDF = new Blob([pdfByteArray], { type: 'application/pdf' });
+    const fileURL = URL.createObjectURL(PDF);
+
+    this.setState({
+      fileURL
+    });
+  };
+
+  parseByteArray = byteArray => {
+    const options = {
+      untilTag: ''
+    };
+
+    let dataSet;
+
+    try {
+      dataSet = dicomParser.parseDicom(byteArray, options);
+    } catch (error) {
+      this.setState({
+        error
+      });
+    }
+
+    return dataSet;
+  };
+
+  componentDidMount() {
+    const dataSet = this.parseByteArray(this.props.byteArray);
+
+    this.renderPDF(dataSet);
+  }
+
+  render() {
+    return (
+      <div
+        className={'DicomPDFViewport'}
+        style={{ width: '100%', height: '100%' }}
+      >
+        {this.state.fileURL && (
+          <object
+            data={this.state.fileURL}
+            type="application/pdf"
+            width="100%"
+            height="100%"
+          />
+        )}
+        {this.state.error && <h2>{JSON.stringify(this.state.error)}</h2>}
+      </div>
+    );
+  }
+}
+
+export default DicomPDFViewport;