git ssb

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const ethUtils = require('ethereumjs-util')
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module.exports = class Address {
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  constructor (value) {
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    // Special case: duplicate
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    if (value instanceof Address) {
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      this._value = new Buffer(value._value)
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      return
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    }
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    if (value instanceof Uint8Array) {
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      this._value = new Buffer(value)
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    } else if (typeof value !== 'string') {
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      throw new Error('Invalid input to address')
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    } else if (!ethUtils.isHexPrefixed(value)) {
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      throw new Error('Invalid address format')
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    } else {
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      this._value = new Buffer(ethUtils.stripHexPrefix(value), 'hex')
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    }
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    if (this._value.length !== 20) {
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      throw new Error('Invalid address length')
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    }
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  }
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  toBuffer () {
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    return this._value
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  }
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  toString () {
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    return '0x' + this._value.toString('hex')
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  }
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  isZero () {
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    return this._value.equals(ethUtils.zeros(20))
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  }
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}
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