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Merge pull request #2 from btc-vision/dev
Added abi coder
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import { createHash } from 'node:crypto'; | ||
import { BinaryReader } from '../buffer/BinaryReader'; | ||
import { BufferHelper } from '../utils/BufferHelper'; | ||
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export enum ABIDataTypes { | ||
UINT8 = 'UINT8', | ||
UINT16 = 'UINT16', | ||
UINT32 = 'UINT32', | ||
BOOL = 'BOOL', | ||
ADDRESS = 'ADDRESS', | ||
STRING = 'STRING', | ||
BYTES32 = 'BYTES32', | ||
UINT256 = 'UINT256', | ||
TUPLE = 'TUPLE', | ||
} | ||
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export class ABICoder { | ||
constructor() {} | ||
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public decodeData(data: Uint8Array, types: ABIDataTypes[]): unknown[] { | ||
const byteReader = new BinaryReader(data); | ||
const result: unknown[] = []; | ||
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for (let i = 0; i < types.length; i++) { | ||
const type = types[i]; | ||
switch (type) { | ||
case ABIDataTypes.UINT8: | ||
result.push(byteReader.readU8()); | ||
break; | ||
case ABIDataTypes.UINT16: | ||
result.push(byteReader.readU16()); | ||
break; | ||
case ABIDataTypes.UINT32: | ||
result.push(byteReader.readU32()); | ||
break; | ||
case ABIDataTypes.BYTES32: | ||
result.push(byteReader.readBytes(32)); | ||
break; | ||
case ABIDataTypes.BOOL: | ||
result.push(byteReader.readBoolean()); | ||
break; | ||
case ABIDataTypes.ADDRESS: | ||
result.push(byteReader.readAddress()); | ||
break; | ||
case ABIDataTypes.STRING: | ||
result.push(byteReader.readStringWithLength()); | ||
break; | ||
case ABIDataTypes.UINT256: | ||
result.push(byteReader.readU256()); | ||
break; | ||
case ABIDataTypes.TUPLE: // very basic for now, only contains uint256 | ||
result.push(byteReader.readTuple()); | ||
break; | ||
} | ||
} | ||
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return result; | ||
} | ||
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public encodePointer(key: string): bigint { | ||
const hash = this.sha256(key); | ||
const finalBuffer = Buffer.alloc(BufferHelper.EXPECTED_BUFFER_LENGTH); | ||
const selector = hash.slice(0, BufferHelper.EXPECTED_BUFFER_LENGTH); // 32 bytes | ||
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for (let i = 0; i < BufferHelper.EXPECTED_BUFFER_LENGTH; i++) { | ||
finalBuffer[i] = selector[i]; | ||
} | ||
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return BigInt('0x' + finalBuffer.toString('hex')); | ||
} | ||
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public encodePointerHash(pointer: number, sub: bigint): Uint8Array { | ||
const finalBuffer = new Uint8Array(BufferHelper.EXPECTED_BUFFER_LENGTH + 2); // 32 bytes for `sub` + 2 bytes for `pointer` | ||
// Encode pointer | ||
finalBuffer[0] = pointer & 0xff; | ||
finalBuffer[1] = (pointer >> 8) & 0xff; | ||
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// Convert `sub` to Uint8Array and append it | ||
const subKey = this.bigIntToUint8Array(sub, BufferHelper.EXPECTED_BUFFER_LENGTH); // Assuming a function to convert BigInt to Uint8Array of fixed size | ||
finalBuffer.set(subKey, 2); | ||
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const hashed = this.sha256(finalBuffer); | ||
if (hashed.byteLength !== BufferHelper.EXPECTED_BUFFER_LENGTH) { | ||
throw new Error('Invalid hash length'); | ||
} | ||
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return hashed; | ||
} | ||
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public encodeSelector(selectorIdentifier: string): string { | ||
// first 4 bytes of sha256 hash of the function signature | ||
const hash = this.sha256(selectorIdentifier); | ||
const selector = hash.slice(0, 4); // 4 bytes | ||
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return selector.toString('hex'); | ||
} | ||
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public numericSelectorToHex(selector: number): string { | ||
return selector.toString(16); | ||
} | ||
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private bigIntToUint8Array(bigIntValue: bigint, length: number): Uint8Array { | ||
const byteArray = new Uint8Array(length); | ||
const buf = BufferHelper.valueToUint8Array(bigIntValue); | ||
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for (let i = 0; i < length; i++) { | ||
byteArray[i] = buf[i] || 0; | ||
} | ||
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return byteArray; | ||
} | ||
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private sha256(buffer: Buffer | string | Uint8Array): Buffer { | ||
return createHash('sha256').update(buffer).digest(); | ||
} | ||
} |
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