@nurliman/base85/dist/index.js

Browser and Node.js-compatible Base85 encoder/decoder.

// src/utils.ts
function charCodeArrayToString(charCodes) {
  let output = "";
  for (let i = 0; i < charCodes.length; i++) {
    output += String.fromCharCode(charCodes[i]);
  }
  return output;
}

// src/decode.ts
function decodeBase85(input) {
  const ASCII_OFFSET = 33;
  const BASE85_BLOCK_SIZE = 5;
  const BYTE_MASK = 255;
  input = input.replace(/^<~/g, "").replace(/~>$/g, "");
  if (!input) return "";
  input = input.replace(/\s/g, "").replace("z", "!!!!!");
  const paddingLength = input.length % BASE85_BLOCK_SIZE || BASE85_BLOCK_SIZE;
  const paddingCharacters = "uuuuu".slice(paddingLength);
  input += paddingCharacters;
  const decodedBytes = [];
  for (let chunkStart = 0; input.length > chunkStart; chunkStart += 5) {
    const decodedChunk = 52200625 * (input.charCodeAt(chunkStart) - ASCII_OFFSET) + 614125 * (input.charCodeAt(chunkStart + 1) - ASCII_OFFSET) + 7225 * (input.charCodeAt(chunkStart + 2) - ASCII_OFFSET) + 85 * (input.charCodeAt(chunkStart + 3) - ASCII_OFFSET) + (input.charCodeAt(chunkStart + 4) - ASCII_OFFSET);
    decodedBytes.push(
      BYTE_MASK & decodedChunk >> 24,
      BYTE_MASK & decodedChunk >> 16,
      BYTE_MASK & decodedChunk >> 8,
      BYTE_MASK & decodedChunk
    );
  }
  if (paddingCharacters.length > 0) {
    decodedBytes.splice(-paddingCharacters.length);
  }
  return charCodeArrayToString(decodedBytes);
}

// src/encode.ts
function encodeBase85(input, { wrap = true } = {}) {
  if (!input) return wrap ? "<~~>" : "";
  const paddingLength = input.length % 4 || 4;
  const paddingCharacters = "\0\0\0\0".slice(paddingLength);
  input += paddingCharacters;
  const encodedArray = [];
  for (let index = 0; index < input.length; index += 4) {
    let charCodeSum = (input.charCodeAt(index) << 24) + (input.charCodeAt(index + 1) << 16) + (input.charCodeAt(index + 2) << 8) + input.charCodeAt(index + 3);
    if (charCodeSum !== 0) {
      const encodedChars = [];
      for (let j = 0; j < 5; j++) {
        const encodedChar = charCodeSum % 85;
        charCodeSum = (charCodeSum - encodedChar) / 85;
        encodedChars.unshift(encodedChar + 33);
      }
      encodedArray.push(...encodedChars);
    } else {
      encodedArray.push(122);
    }
  }
  if (paddingCharacters.length > 0) {
    encodedArray.splice(-paddingCharacters.length);
  }
  const encodedString = charCodeArrayToString(encodedArray);
  const output = wrap ? `<~${encodedString}~>` : encodedString;
  return output;
}

// src/index.ts
var base85 = {
  encode: encodeBase85,
  decode: decodeBase85
};
var src_default = base85;
export {
  decodeBase85,
  src_default as default,
  encodeBase85
};
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