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49 lines
1.4 KiB
49 lines
1.4 KiB
//See: https://github.com/ethereum/wiki/wiki/RLP |
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import { getBytes } from "./data.js"; |
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function arrayifyInteger(value) { |
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const result = []; |
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while (value) { |
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result.unshift(value & 0xff); |
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value >>= 8; |
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} |
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return result; |
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} |
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function _encode(object) { |
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if (Array.isArray(object)) { |
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let payload = []; |
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object.forEach(function (child) { |
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payload = payload.concat(_encode(child)); |
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}); |
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if (payload.length <= 55) { |
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payload.unshift(0xc0 + payload.length); |
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return payload; |
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} |
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const length = arrayifyInteger(payload.length); |
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length.unshift(0xf7 + length.length); |
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return length.concat(payload); |
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} |
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const data = Array.prototype.slice.call(getBytes(object, "object")); |
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if (data.length === 1 && data[0] <= 0x7f) { |
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return data; |
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} |
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else if (data.length <= 55) { |
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data.unshift(0x80 + data.length); |
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return data; |
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} |
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const length = arrayifyInteger(data.length); |
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length.unshift(0xb7 + length.length); |
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return length.concat(data); |
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} |
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const nibbles = "0123456789abcdef"; |
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/** |
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* Encodes %%object%% as an RLP-encoded [[DataHexString]]. |
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*/ |
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export function encodeRlp(object) { |
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let result = "0x"; |
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for (const v of _encode(object)) { |
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result += nibbles[v >> 4]; |
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result += nibbles[v & 0xf]; |
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} |
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return result; |
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} |
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//# sourceMappingURL=rlp-encode.js.map
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