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React-native bigint64 deserialization problem - refactoring/bigint64le #16

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React-native bigint64 deserialization problem - refactoring/bigint64le #16

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89928fb
React-native compatible big int deserialization
Admdebian Nov 29, 2021
5377e05
byte lenght bugfix
Admdebian Nov 29, 2021
a0f706d
Custom deserialization function for 8 bit buffers
Admdebian Nov 29, 2021
372cef9
lint and comment fix
Admdebian Nov 29, 2021
78b1e2b
number to bigint refactoring and small changes
Admdebian Nov 29, 2021
3e53b69
fix test failure: The number NaN cannot be converted to a BigInt
Admdebian Nov 29, 2021
0f9e287
Bugfix for long buffers
Admdebian Nov 29, 2021
a2dce11
Minimal changes to work with react-native
Admdebian Nov 29, 2021
e7374a8
Fix signed numbers without << operator
Admdebian Nov 29, 2021
1eba710
Problem with biginteger and BigInteger
Admdebian Dec 9, 2021
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React-native compatible big int deserialization
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@Admdebian
Admdebian committed Nov 29, 2021
commit 89928fbd1651640c04c989ba595b29d295aa1e03
28 changes: 4 additions & 24 deletions src/readBig.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,3 @@
import { Buffer } from 'buffer'

// https://github.com/nodejs/node/blob/v14.17.0/lib/internal/errors.js#L758
const ERR_BUFFER_OUT_OF_BOUNDS = () => new Error('Attempt to access memory outside buffer bounds')

Expand Down Expand Up @@ -28,30 +26,12 @@ function boundsError(value: number, length: number) {
throw ERR_OUT_OF_RANGE('offset', `>= 0 and <= ${length}`, value)
}

// https://github.com/nodejs/node/blob/v14.17.0/lib/internal/buffer.js#L129-L145
// This function works with react-native >= 0.66.1
export function readBigInt64LE(buffer: Buffer, offset = 0): bigint {
validateNumber(offset, 'offset')
const first = buffer[offset]
const last = buffer[offset + 7]
if (first === undefined || last === undefined) boundsError(offset, buffer.length - 8)
// tslint:disable-next-line:no-bitwise
const val = buffer[offset + 4] + buffer[offset + 5] * 2 ** 8 + buffer[offset + 6] * 2 ** 16 + (last << 24) // Overflow
return (
(BigInt(val) << BigInt(32)) + // tslint:disable-line:no-bitwise
BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24)
)
return BigInt(buffer.readIntLE(offset, 8))
}

// https://github.com/nodejs/node/blob/v14.17.0/lib/internal/buffer.js#L89-L107
// This function works with react-native >= 0.66.1
export function readBigUInt64LE(buffer: Buffer, offset = 0): bigint {
validateNumber(offset, 'offset')
const first = buffer[offset]
const last = buffer[offset + 7]
if (first === undefined || last === undefined) boundsError(offset, buffer.length - 8)

const lo = first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24

const hi = buffer[++offset] + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + last * 2 ** 24

return BigInt(lo) + (BigInt(hi) << BigInt(32)) // tslint:disable-line:no-bitwise
return BigInt(buffer.readUIntLE(offset, 8))
}