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perf: replace the recursion with a cycle in writeBuffer #79

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perf: replace the recursion with a cycle in writeBuffer #79

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11f44c5
perf: replace the recursion with a cycle in `writeBuffer`
Jun 7, 2025
51bddc5
Merge remote-tracking branch 'upstream/main' into optimize-writebuffer
Jun 16, 2025
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1 change: 1 addition & 0 deletions src/boc/utils/strings.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import { readString, stringToCell } from "./strings";

describe('strings', () => {
let cases: string[][] = [
[''],
['123'],
['12345678901234567890123456789012345678901234567890123456789012345678901234567890'],
['привет мир 👀 привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀привет мир 👀']
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33 changes: 22 additions & 11 deletions src/boc/utils/strings.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -40,18 +40,29 @@ export function readString(slice: Slice) {
}

function writeBuffer(src: Buffer, builder: Builder) {
if (src.length > 0) {
let bytes = Math.floor(builder.availableBits / 8);
if (src.length > bytes) {
let a = src.subarray(0, bytes);
let t = src.subarray(bytes);
builder = builder.storeBuffer(a);
let bb = beginCell();
writeBuffer(t, bb);
builder = builder.storeRef(bb.endCell());
} else {
builder = builder.storeBuffer(src);
if (src.length === 0) {
return;
}

const rootOffset = Math.floor(builder.availableBits / 8);
builder.storeBuffer(src.subarray(0, rootOffset));

const bytesPerCell = 127;
const tailSize = Math.ceil((src.length - rootOffset) / bytesPerCell);
let head: Cell | undefined;

for (let i = tailSize - 1; i >= 0; i--) {
const offset = rootOffset + i * bytesPerCell;
const piece = src.subarray(offset, offset + bytesPerCell);
const nextHead = beginCell().storeBuffer(piece);
if (head) {
nextHead.storeRef(head);
}
head = nextHead.endCell();
}

if (head) {
builder.storeRef(head);
}
}

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