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// The wire codec: the subset of msgpack MNP uses (maps, strings, integers,
// binary, arrays, null), and hex for the ids the transport mints.
// ── Minimal msgpack encode/decode ────────────────────────────────────────────
// Covers the subset used by MNP: maps, strings, integers, binary, arrays, null.
function msgpack_encode(obj) {
const parts = [];
_encodeValue(obj, parts);
const total = parts.reduce((s, p) => s + p.length, 0);
const result = new Uint8Array(total);
let off = 0;
for (const p of parts) { result.set(p, off); off += p.length; }
return result;
}
function _encodeValue(val, parts) {
if (val === null || val === undefined) {
parts.push(new Uint8Array([0xc0]));
} else if (typeof val === 'boolean') {
parts.push(new Uint8Array([val ? 0xc3 : 0xc2]));
} else if (typeof val === 'number') {
if (Number.isInteger(val)) {
if (val >= 0 && val <= 127) {
parts.push(new Uint8Array([val]));
} else if (val >= 0 && val <= 0xff) {
parts.push(new Uint8Array([0xcc, val]));
} else if (val >= 0 && val <= 0xffff) {
const b = new Uint8Array(3); b[0] = 0xcd;
new DataView(b.buffer).setUint16(1, val, false);
parts.push(b);
} else if (val >= 0 && val <= 0xffffffff) {
const b = new Uint8Array(5); b[0] = 0xce;
new DataView(b.buffer).setUint32(1, val, false);
parts.push(b);
} else if (val >= 0 && val <= Number.MAX_SAFE_INTEGER) {
// Same split as the 0xcf decoder case above, in reverse — without
// this, a value over 0xffffffff fell to the plain int32 branch
// below and silently wrapped to a wrong, unrelated number instead
// of failing loudly.
const b = new Uint8Array(9); b[0] = 0xcf;
const dv = new DataView(b.buffer);
dv.setUint32(1, Math.floor(val / 4294967296), false);
dv.setUint32(5, val % 4294967296, false);
parts.push(b);
} else if (val >= -32 && val < 0) {
parts.push(new Uint8Array([val & 0xff]));
} else if (val >= -128 && val < 0) {
const b = new Uint8Array(2); b[0] = 0xd0; b[1] = val & 0xff;
parts.push(b);
} else {
const b = new Uint8Array(5); b[0] = 0xd2;
new DataView(b.buffer).setInt32(1, val, false);
parts.push(b);
}
} else {
const b = new Uint8Array(9); b[0] = 0xcb;
new DataView(b.buffer).setFloat64(1, val, false);
parts.push(b);
}
} else if (typeof val === 'string') {
const encoded = new TextEncoder().encode(val);
if (encoded.length <= 31) {
parts.push(new Uint8Array([0xa0 | encoded.length]));
} else if (encoded.length <= 0xff) {
parts.push(new Uint8Array([0xd9, encoded.length]));
} else if (encoded.length <= 0xffff) {
const b = new Uint8Array(3); b[0] = 0xda;
new DataView(b.buffer).setUint16(1, encoded.length, false);
parts.push(b);
} else {
const b = new Uint8Array(5); b[0] = 0xdb;
new DataView(b.buffer).setUint32(1, encoded.length, false);
parts.push(b);
}
parts.push(encoded);
} else if (val instanceof Uint8Array) {
if (val.length <= 0xff) {
parts.push(new Uint8Array([0xc4, val.length]));
} else if (val.length <= 0xffff) {
const b = new Uint8Array(3); b[0] = 0xc5;
new DataView(b.buffer).setUint16(1, val.length, false);
parts.push(b);
} else {
const b = new Uint8Array(5); b[0] = 0xc6;
new DataView(b.buffer).setUint32(1, val.length, false);
parts.push(b);
}
parts.push(val);
} else if (Array.isArray(val)) {
if (val.length <= 15) {
parts.push(new Uint8Array([0x90 | val.length]));
} else if (val.length <= 0xffff) {
const b = new Uint8Array(3); b[0] = 0xdc;
new DataView(b.buffer).setUint16(1, val.length, false);
parts.push(b);
} else {
const b = new Uint8Array(5); b[0] = 0xdd;
new DataView(b.buffer).setUint32(1, val.length, false);
parts.push(b);
}
for (const item of val) _encodeValue(item, parts);
} else if (typeof val === 'object') {
const keys = Object.keys(val);
if (keys.length <= 15) {
parts.push(new Uint8Array([0x80 | keys.length]));
} else if (keys.length <= 0xffff) {
const b = new Uint8Array(3); b[0] = 0xde;
new DataView(b.buffer).setUint16(1, keys.length, false);
parts.push(b);
} else {
const b = new Uint8Array(5); b[0] = 0xdf;
new DataView(b.buffer).setUint32(1, keys.length, false);
parts.push(b);
}
for (const k of keys) {
_encodeValue(k, parts);
_encodeValue(val[k], parts);
}
}
}
function msgpack_decode(buf) {
const view = new DataView(buf.buffer, buf.byteOffset, buf.byteLength);
const [val] = _decodeValue(buf, view, 0);
return val;
}
function _decodeValue(buf, view, offset) {
const byte = buf[offset];
if (byte <= 0x7f) return [byte, offset + 1];
if ((byte & 0xe0) === 0xe0) return [byte - 256, offset + 1];
if ((byte & 0xa0) === 0xa0) {
const len = byte & 0x1f;
return [new TextDecoder().decode(buf.slice(offset + 1, offset + 1 + len)), offset + 1 + len];
}
if ((byte & 0xf0) === 0x90) {
const len = byte & 0x0f;
return _decodeArray(buf, view, offset + 1, len);
}
if ((byte & 0xf0) === 0x80) {
const len = byte & 0x0f;
return _decodeMap(buf, view, offset + 1, len);
}
switch (byte) {
case 0xc0: return [null, offset + 1];
case 0xc2: return [false, offset + 1];
case 0xc3: return [true, offset + 1];
case 0xc4: { const len = buf[offset + 1]; return [buf.slice(offset + 2, offset + 2 + len), offset + 2 + len]; }
case 0xc5: { const len = view.getUint16(offset + 1, false); return [buf.slice(offset + 3, offset + 3 + len), offset + 3 + len]; }
case 0xc6: { const len = view.getUint32(offset + 1, false); return [buf.slice(offset + 5, offset + 5 + len), offset + 5 + len]; }
case 0xcc: return [buf[offset + 1], offset + 2];
case 0xcd: return [view.getUint16(offset + 1, false), offset + 3];
case 0xce: return [view.getUint32(offset + 1, false), offset + 5];
// uint64/int64 — never emitted by this file's own encoder (a JS number
// above 0xffffffff falls to float64 there), but the node's real msgpack
// library sends a plain uint64 for any Python int over ~4.3 billion, and
// a raw byte count crosses that easily (found live: IndexProgress.
// scanned_bytes/total_bytes in the handshake ack, indexer.py, for a
// group whose total library size exceeds ~4 GB). Split into two 32-bit
// halves rather than DataView's getBigUint64/getBigInt64 — a BigInt
// would silently poison every arithmetic use of these fields elsewhere
// (percentage math, comparisons) — and every real byte count fits in a
// plain JS number well under Number.MAX_SAFE_INTEGER (2^53).
case 0xcf: {
const hi = view.getUint32(offset + 1, false);
const lo = view.getUint32(offset + 5, false);
return [hi * 4294967296 + lo, offset + 9];
}
case 0xd3: {
const hi = view.getInt32(offset + 1, false);
const lo = view.getUint32(offset + 5, false);
return [hi * 4294967296 + lo, offset + 9];
}
case 0xcb: return [view.getFloat64(offset + 1, false), offset + 9];
case 0xd0: return [view.getInt8(offset + 1), offset + 2];
case 0xd1: return [view.getInt16(offset + 1, false), offset + 3];
case 0xd2: return [view.getInt32(offset + 1, false), offset + 5];
case 0xd9: {
const len = buf[offset + 1];
return [new TextDecoder().decode(buf.slice(offset + 2, offset + 2 + len)), offset + 2 + len];
}
case 0xda: {
const len = view.getUint16(offset + 1, false);
return [new TextDecoder().decode(buf.slice(offset + 3, offset + 3 + len)), offset + 3 + len];
}
case 0xdb: {
const len = view.getUint32(offset + 1, false);
return [new TextDecoder().decode(buf.slice(offset + 5, offset + 5 + len)), offset + 5 + len];
}
case 0xdc: { const len = view.getUint16(offset + 1, false); return _decodeArray(buf, view, offset + 3, len); }
case 0xdd: { const len = view.getUint32(offset + 1, false); return _decodeArray(buf, view, offset + 5, len); }
case 0xde: { const len = view.getUint16(offset + 1, false); return _decodeMap(buf, view, offset + 3, len); }
case 0xdf: { const len = view.getUint32(offset + 1, false); return _decodeMap(buf, view, offset + 5, len); }
default: throw new Error(`Unknown msgpack type: 0x${byte.toString(16)}`);
}
}
function _decodeArray(buf, view, offset, count) {
const arr = [];
for (let i = 0; i < count; i++) {
const [val, newOff] = _decodeValue(buf, view, offset);
arr.push(val);
offset = newOff;
}
return [arr, offset];
}
function _decodeMap(buf, view, offset, count) {
const obj = {};
for (let i = 0; i < count; i++) {
const [key, off1] = _decodeValue(buf, view, offset);
const [val, off2] = _decodeValue(buf, view, off1);
obj[key] = val;
offset = off2;
}
return [obj, offset];
}
function _hex(bytes) {
return [...bytes].map(b => b.toString(16).padStart(2, '0')).join('');
}
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