91 lines
2.8 KiB
TypeScript
91 lines
2.8 KiB
TypeScript
'use strict';
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import { bigNumberify } from './bignumber';
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import { arrayify, concat, hexlify, padZeros} from './convert';
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import { toUtf8Bytes } from './utf8';
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import { keccak256 as hashKeccak256 } from './keccak256';
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import { sha256 as hashSha256 } from './sha2';
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var regexBytes = new RegExp("^bytes([0-9]+)$");
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var regexNumber = new RegExp("^(u?int)([0-9]*)$");
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var regexArray = new RegExp("^(.*)\\[([0-9]*)\\]$");
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var Zeros = '0000000000000000000000000000000000000000000000000000000000000000';
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function _pack(type: string, value: any, isArray?: boolean): Uint8Array {
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switch(type) {
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case 'address':
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if (isArray) { return padZeros(value, 32); }
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return arrayify(value);
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case 'string':
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return toUtf8Bytes(value);
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case 'bytes':
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return arrayify(value);
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case 'bool':
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value = (value ? '0x01': '0x00');
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if (isArray) { return padZeros(value, 32); }
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return arrayify(value);
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}
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var match = type.match(regexNumber);
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if (match) {
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//var signed = (match[1] === 'int')
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let size = parseInt(match[2] || "256")
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if ((size % 8 != 0) || size === 0 || size > 256) {
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throw new Error('invalid number type - ' + type);
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}
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if (isArray) { size = 256; }
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value = bigNumberify(value).toTwos(size);
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return padZeros(value, size / 8);
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}
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match = type.match(regexBytes);
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if (match) {
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let size = parseInt(match[1]);
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if (String(size) != match[1] || size === 0 || size > 32) {
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throw new Error('invalid number type - ' + type);
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}
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if (arrayify(value).byteLength !== size) { throw new Error('invalid value for ' + type); }
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if (isArray) { return arrayify((value + Zeros).substring(0, 66)); }
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return value;
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}
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match = type.match(regexArray);
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if (match) {
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var baseType = match[1];
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var count = parseInt(match[2] || value.length);
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if (count != value.length) { throw new Error('invalid value for ' + type); }
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var result = [];
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value.forEach(function(value) {
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value = _pack(baseType, value, true);
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result.push(value);
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});
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return concat(result);
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}
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throw new Error('unknown type - ' + type);
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}
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// @TODO: Array Enum
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export function pack(types: Array<string>, values: Array<any>) {
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if (types.length != values.length) { throw new Error('type/value count mismatch'); }
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var tight = [];
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types.forEach(function(type, index) {
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tight.push(_pack(type, values[index]));
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});
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return hexlify(concat(tight));
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}
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export function keccak256(types: Array<string>, values: Array<any>) {
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return hashKeccak256(pack(types, values));
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}
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export function sha256(types: Array<string>, values: Array<any>) {
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return hashSha256(pack(types, values));
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}
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