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Fix Uint64BE encoding/decoding on browsers (#965) 

Inspired by https://github.com/solana-labs/buffer-layout/blob/master/src/Layout.ts
This commit is contained in:
Mohammad Amin Khashkhashi Moghaddam 2023-07-19 16:33:15 +02:00 committed by GitHub
parent 49fbd2f121
commit 03185cb17c
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1 changed files with 9 additions and 2 deletions
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governance/xc_admin/packages/xc_admin_common/src/governance_payload/BufferLayoutExt.ts
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@ -5,14 +5,21 @@ export class UInt64BE extends Layout<bigint> {
super(span, property); super(span, property);
} }
// Note: we can not use read/writeBigUInt64BE because it is not supported in the browsers
override decode(b: Uint8Array, offset?: number): bigint { override decode(b: Uint8Array, offset?: number): bigint {
let o = offset ?? 0; let o = offset ?? 0;
return Buffer.from(b.slice(o, o + this.span)).readBigUInt64BE(); const buffer = Buffer.from(b.slice(o, o + this.span));
const hi32 = buffer.readUInt32BE();
const lo32 = buffer.readUInt32BE(4);
return BigInt(lo32) + (BigInt(hi32) << BigInt(32));
} }
override encode(src: bigint, b: Uint8Array, offset?: number): number { override encode(src: bigint, b: Uint8Array, offset?: number): number {
const buffer = Buffer.alloc(this.span); const buffer = Buffer.alloc(this.span);
buffer.writeBigUint64BE(src); const hi32 = Number(src >> BigInt(32));
const lo32 = Number(src & BigInt(0xffffffff));
buffer.writeUInt32BE(hi32, 0);
buffer.writeUInt32BE(lo32, 4);
b.set(buffer, offset); b.set(buffer, offset);
return this.span; return this.span;
} }