fix: Microscopy bulkdata and image retrieve (#3894)

extensions/default/src/DicomWebDataSource/utils/findIndexOfString.ts

@@ -0,0 +1,47 @@
+function checkToken(token, data, dataOffset): boolean {
+  if (dataOffset + token.length > data.length) {
+    return false;
+  }
+
+  let endIndex = dataOffset;
+
+  for (let i = 0; i < token.length; i++) {
+    if (token[i] !== data[endIndex++]) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function stringToUint8Array(str: string): Uint8Array {
+  const uint = new Uint8Array(str.length);
+
+  for (let i = 0, j = str.length; i < j; i++) {
+    uint[i] = str.charCodeAt(i);
+  }
+
+  return uint;
+}
+
+function findIndexOfString(
+  data: Uint8Array,
+  str: string,
+  offset?: number
+): number {
+  offset = offset || 0;
+
+  const token = stringToUint8Array(str);
+
+  for (let i = offset; i < data.length; i++) {
+    if (token[0] === data[i]) {
+      // console.log('match @', i);
+      if (checkToken(token, data, i)) {
+        return i;
+      }
+    }
+  }
+
+  return -1;
+}
+export default findIndexOfString;