'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

const useBuffer = globalThis.process && !globalThis.process.browser && globalThis.Buffer && typeof globalThis.Buffer.isBuffer === 'function';
const textDecoder = new TextDecoder();
const textEncoder = new TextEncoder();
function isBuffer(buf) {
  return useBuffer && globalThis.Buffer.isBuffer(buf);
}
function asU8A(buf) {
  if (!(buf instanceof Uint8Array)) {
    return Uint8Array.from(buf);
  }
  return isBuffer(buf) ? new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength) : buf;
}
const toString = useBuffer ? (bytes, start, end) => {
  return end - start > 64 ? globalThis.Buffer.from(bytes.subarray(start, end)).toString('utf8') : utf8Slice(bytes, start, end);
} : (bytes, start, end) => {
  return end - start > 64 ? textDecoder.decode(bytes.subarray(start, end)) : utf8Slice(bytes, start, end);
};
const fromString = useBuffer ? string => {
  return string.length > 64 ? globalThis.Buffer.from(string) : utf8ToBytes(string);
} : string => {
  return string.length > 64 ? textEncoder.encode(string) : utf8ToBytes(string);
};
const fromArray = arr => {
  return Uint8Array.from(arr);
};
const slice = useBuffer ? (bytes, start, end) => {
  if (isBuffer(bytes)) {
    return new Uint8Array(bytes.subarray(start, end));
  }
  return bytes.slice(start, end);
} : (bytes, start, end) => {
  return bytes.slice(start, end);
};
const concat = useBuffer ? (chunks, length) => {
  chunks = chunks.map(c => c instanceof Uint8Array ? c : globalThis.Buffer.from(c));
  return asU8A(globalThis.Buffer.concat(chunks, length));
} : (chunks, length) => {
  const out = new Uint8Array(length);
  let off = 0;
  for (let b of chunks) {
    if (off + b.length > out.length) {
      b = b.subarray(0, out.length - off);
    }
    out.set(b, off);
    off += b.length;
  }
  return out;
};
const alloc = useBuffer ? size => {
  return globalThis.Buffer.allocUnsafe(size);
} : size => {
  return new Uint8Array(size);
};
const toHex = useBuffer ? d => {
  if (typeof d === 'string') {
    return d;
  }
  return globalThis.Buffer.from(toBytes(d)).toString('hex');
} : d => {
  if (typeof d === 'string') {
    return d;
  }
  return Array.prototype.reduce.call(toBytes(d), (p, c) => `${ p }${ c.toString(16).padStart(2, '0') }`, '');
};
const fromHex = useBuffer ? hex => {
  if (hex instanceof Uint8Array) {
    return hex;
  }
  return globalThis.Buffer.from(hex, 'hex');
} : hex => {
  if (hex instanceof Uint8Array) {
    return hex;
  }
  if (!hex.length) {
    return new Uint8Array(0);
  }
  return new Uint8Array(hex.split('').map((c, i, d) => i % 2 === 0 ? `0x${ c }${ d[i + 1] }` : '').filter(Boolean).map(e => parseInt(e, 16)));
};
function toBytes(obj) {
  if (obj instanceof Uint8Array && obj.constructor.name === 'Uint8Array') {
    return obj;
  }
  if (obj instanceof ArrayBuffer) {
    return new Uint8Array(obj);
  }
  if (ArrayBuffer.isView(obj)) {
    return new Uint8Array(obj.buffer, obj.byteOffset, obj.byteLength);
  }
  throw new Error('Unknown type, must be binary type');
}
function compare(b1, b2) {
  if (isBuffer(b1) && isBuffer(b2)) {
    return b1.compare(b2);
  }
  for (let i = 0; i < b1.length; i++) {
    if (b1[i] === b2[i]) {
      continue;
    }
    return b1[i] < b2[i] ? -1 : 1;
  }
  return 0;
}
function utf8ToBytes(string, units = Infinity) {
  let codePoint;
  const length = string.length;
  let leadSurrogate = null;
  const bytes = [];
  for (let i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i);
    if (codePoint > 55295 && codePoint < 57344) {
      if (!leadSurrogate) {
        if (codePoint > 56319) {
          if ((units -= 3) > -1)
            bytes.push(239, 191, 189);
          continue;
        } else if (i + 1 === length) {
          if ((units -= 3) > -1)
            bytes.push(239, 191, 189);
          continue;
        }
        leadSurrogate = codePoint;
        continue;
      }
      if (codePoint < 56320) {
        if ((units -= 3) > -1)
          bytes.push(239, 191, 189);
        leadSurrogate = codePoint;
        continue;
      }
      codePoint = (leadSurrogate - 55296 << 10 | codePoint - 56320) + 65536;
    } else if (leadSurrogate) {
      if ((units -= 3) > -1)
        bytes.push(239, 191, 189);
    }
    leadSurrogate = null;
    if (codePoint < 128) {
      if ((units -= 1) < 0)
        break;
      bytes.push(codePoint);
    } else if (codePoint < 2048) {
      if ((units -= 2) < 0)
        break;
      bytes.push(codePoint >> 6 | 192, codePoint & 63 | 128);
    } else if (codePoint < 65536) {
      if ((units -= 3) < 0)
        break;
      bytes.push(codePoint >> 12 | 224, codePoint >> 6 & 63 | 128, codePoint & 63 | 128);
    } else if (codePoint < 1114112) {
      if ((units -= 4) < 0)
        break;
      bytes.push(codePoint >> 18 | 240, codePoint >> 12 & 63 | 128, codePoint >> 6 & 63 | 128, codePoint & 63 | 128);
    } else {
      throw new Error('Invalid code point');
    }
  }
  return bytes;
}
function utf8Slice(buf, offset, end) {
  const res = [];
  while (offset < end) {
    const firstByte = buf[offset];
    let codePoint = null;
    let bytesPerSequence = firstByte > 239 ? 4 : firstByte > 223 ? 3 : firstByte > 191 ? 2 : 1;
    if (offset + bytesPerSequence <= end) {
      let secondByte, thirdByte, fourthByte, tempCodePoint;
      switch (bytesPerSequence) {
      case 1:
        if (firstByte < 128) {
          codePoint = firstByte;
        }
        break;
      case 2:
        secondByte = buf[offset + 1];
        if ((secondByte & 192) === 128) {
          tempCodePoint = (firstByte & 31) << 6 | secondByte & 63;
          if (tempCodePoint > 127) {
            codePoint = tempCodePoint;
          }
        }
        break;
      case 3:
        secondByte = buf[offset + 1];
        thirdByte = buf[offset + 2];
        if ((secondByte & 192) === 128 && (thirdByte & 192) === 128) {
          tempCodePoint = (firstByte & 15) << 12 | (secondByte & 63) << 6 | thirdByte & 63;
          if (tempCodePoint > 2047 && (tempCodePoint < 55296 || tempCodePoint > 57343)) {
            codePoint = tempCodePoint;
          }
        }
        break;
      case 4:
        secondByte = buf[offset + 1];
        thirdByte = buf[offset + 2];
        fourthByte = buf[offset + 3];
        if ((secondByte & 192) === 128 && (thirdByte & 192) === 128 && (fourthByte & 192) === 128) {
          tempCodePoint = (firstByte & 15) << 18 | (secondByte & 63) << 12 | (thirdByte & 63) << 6 | fourthByte & 63;
          if (tempCodePoint > 65535 && tempCodePoint < 1114112) {
            codePoint = tempCodePoint;
          }
        }
      }
    }
    if (codePoint === null) {
      codePoint = 65533;
      bytesPerSequence = 1;
    } else if (codePoint > 65535) {
      codePoint -= 65536;
      res.push(codePoint >>> 10 & 1023 | 55296);
      codePoint = 56320 | codePoint & 1023;
    }
    res.push(codePoint);
    offset += bytesPerSequence;
  }
  return decodeCodePointsArray(res);
}
const MAX_ARGUMENTS_LENGTH = 4096;
function decodeCodePointsArray(codePoints) {
  const len = codePoints.length;
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints);
  }
  let res = '';
  let i = 0;
  while (i < len) {
    res += String.fromCharCode.apply(String, codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH));
  }
  return res;
}

exports.alloc = alloc;
exports.asU8A = asU8A;
exports.compare = compare;
exports.concat = concat;
exports.decodeCodePointsArray = decodeCodePointsArray;
exports.fromArray = fromArray;
exports.fromHex = fromHex;
exports.fromString = fromString;
exports.slice = slice;
exports.toHex = toHex;
exports.toString = toString;
exports.useBuffer = useBuffer;