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3144483 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | /** Frames LF-delimited bytes without decoding or consuming an incomplete final line. */
export function createBoundedLineFramer(maxBytes: number, overflowMessage: string) {
let chunks: Buffer[] = [];
let byteLength = 0;
const clear = () => {
chunks = [];
byteLength = 0;
};
return {
get pendingByteLength() {
return byteLength;
},
clear,
*push(chunk: Buffer): Generator<Buffer> {
let offset = 0;
while (offset < chunk.length) {
const newline = chunk.indexOf(10, offset);
const end = newline === -1 ? chunk.length : newline;
byteLength += end - offset;
if (byteLength > maxBytes) {
throw new Error(overflowMessage);
}
chunks.push(chunk.subarray(offset, end));
if (newline === -1) {
break;
}
const line = Buffer.concat(chunks, byteLength);
clear();
offset = newline + 1;
// A caller may retire after this frame; do not inspect later bytes until it resumes.
yield line;
}
},
};
}
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