@cleerlycode/cornerstone-wado-image-loader/src/imageLoader/wadors/findIndexOfString.js

Cornerstone ImageLoader for DICOM WADO-URI

function checkToken (token, data, dataOffset) {

  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) {
  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, str, offset) {

  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;