sigit.io/src/utils/string.ts

export const shorten = (str: string, offset = 9) => {
  // return original string if it is not long enough
  if (str.length < offset * 2 + 4) return str

  return `${str.slice(0, offset)}...${str.slice(
    str.length - offset,
    str.length
  )}`
}

export const stringToHex = (str: string) => {
  // Convert the string to an array of UTF-16 code units using the spread operator
  const codeUnits = [...str]

  // Map each code unit to its hexadecimal representation
  const hexChars = codeUnits.map((codeUnit) => {
    // Convert the code unit to its hexadecimal representation with leading zeros
    const hex = codeUnit.charCodeAt(0).toString(16).padStart(2, '0')
    return hex
  })

  // Join the hexadecimal characters into a single string
  const hexString = hexChars.join('')

  // Return the resulting hexadecimal string
  return hexString
}

export const hexToString = (hex: string) => {
  // Split the hex string into pairs of two characters
  const pairs = hex.match(/.{1,2}/g) || []

  // Convert each pair from hexadecimal to its decimal equivalent,
  // then convert each decimal value to its character representation
  const chars = pairs.map((pair) => String.fromCharCode(parseInt(pair, 16)))

  // Join the resulting characters into a single string
  return chars.join('')
}

// Function to convert a Uint8Array to a hexadecimal string
export const uint8ArrayToHexString = (uint8Array: Uint8Array) => {
  // Convert each byte in the Uint8Array to a hexadecimal string,
  // pad it with leading zeros if necessary, and join the results
  return Array.from(uint8Array)
    .map((byte) => byte.toString(16).padStart(2, '0')) // Convert byte to hexadecimal string
    .join('') // Join all hexadecimal strings
}

// Function to convert a hexadecimal string to a Uint8Array
export const hexStringToUint8Array = (hexString: string) => {
  // Create a new Uint8Array with half the length of the hex string
  const uint8Array = new Uint8Array(hexString.length / 2)
  // Iterate over pairs of characters in the hex string
  for (let i = 0; i < hexString.length; i += 2) {
    // Parse the pair of characters as a hexadecimal value and store it in the Uint8Array
    uint8Array[i / 2] = parseInt(hexString.substr(i, 2), 16)
  }
  // Return the resulting Uint8Array
  return uint8Array
}