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move utils code; fix sprintf; implement enc/dec

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This commit is contained in:
DavidVentura
2024-01-24 17:13:34 +01:00
parent f00821f8bd
commit ff684361f4
5 changed files with 289 additions and 112 deletions
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asd.js
+39 -19
View File
@@ -1,4 +1,5 @@
import { replaceFunctions, Commands, CommandsByValue, u16_swap } from "./func_replacements.js";
import { placeholderTypes, sprintf } from "./utils.js";
const hook_fn = (name_in_elf, enter, leave) => {
var symbol_addr = DebugSymbol.fromName(name_in_elf).address;
@@ -47,8 +48,8 @@ const hook___android_log_print = () => {
// let _prio = args[0].toInt32();
let _tag = args[1].readCString();
let fmt = args[2].readCString();
// console.log(fmt); // debug if crashes due to missing placeholder
const types = placeholderTypes(fmt); // ['s', 'd', ..]`
// console.log(fmt, types); // debug if crashes due to missing placeholder
let o = {
s: (x) => x.readCString(),
@@ -98,6 +99,7 @@ const hook_udpsend = () => {
}
},
);
let s = {};
hook_fn(
"PktSeq_seqGet",
@@ -110,6 +112,42 @@ const hook_udpsend = () => {
console.log(data);
},
);
let e = {};
hook_fn(
"XqBytesEnc",
(args) => {
s.buf_ptr = args[0];
s.m_buflen = args[1].toInt32();
s.param3 = args[2].toInt32();
s.buf_in = s.buf_ptr.readByteArray(s.m_buflen);
},
(retval) => {
const bufout = s.buf_ptr.readByteArray(s.m_buflen);
console.log(`XqBytesEnc buflen: ${s.m_buflen}, param3: ${s.param3}, buf_in:`);
console.log(s.buf_in);
console.log(`bufout`);
console.log(bufout);
},
);
let d = {};
hook_fn(
"XqBytesDec",
(args) => {
s.buf_ptr = args[0];
s.m_buflen = args[1].toInt32();
s.param3 = args[2].toInt32();
s.buf_in = s.buf_ptr.readByteArray(s.m_buflen);
},
(retval) => {
const bufout = s.buf_ptr.readByteArray(s.m_buflen);
console.log(`XqBytesDec buflen: ${s.m_buflen}, param3: ${s.param3}, buf_in:`);
console.log(s.buf_in);
console.log(`bufout`);
console.log(bufout);
},
);
};
const hook_in_out_buf = (sym, insize, outsize) => {
@@ -190,22 +228,4 @@ function doHooks() {
console.log("NO WORKING");
}
}
const matchy = /%[0-9.-]*([a-z])/g;
const replacy = /(.*?)%[0-9.-]*([a-z])/g;
const placeholderTypes = (str) => {
// '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!'
// =>
// [ 's', 'd', 's', 'd', 's', 'f' ]
return [...str.matchAll(matchy)].map((m) => m[1]);
};
const sprintf = (str, values) => {
// '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!' +
// ["asd", 20, ...]
// =>
// asd, line 20, ...
const matches = str.matchAll(replacy);
return [...matches].map((m, idx) => m[1] + values[idx].toString()).join("");
};
setImmediate(doHooks);
func_replacements.js
+69 -35
View File
@@ -1,5 +1,42 @@
export const u16_swap = (x) => ((x & 0xff00) >> 8) | ((x & 0x00ff) << 8);
export const XqBytesDec = (inoutbuf, buflen, rotate) => {
let new_buf = new Uint8Array(buflen);
new_buf.fill(0x1);
for (let i = 0; i < buflen; i++) {
let b = inoutbuf.add(i).readU8();
if ((b & 1) != 0) {
new_buf[i] = b - 1;
} else {
new_buf[i] = b + 1;
}
}
for (let i = rotate; i < buflen; i++) {
inoutbuf.add(i).writeU8(new_buf[i - rotate]);
}
for (let i = 0; i < rotate; i++) {
inoutbuf.add(i).writeU8(new_buf[buflen - rotate + i]);
}
};
export const XqBytesEnc = (inoutbuf, buflen, rotate) => {
let new_buf = new Uint8Array(buflen);
new_buf.fill(0x1);
for (let i = 0; i < buflen; i++) {
let b = inoutbuf.add(i).readU8();
if ((b & 1) != 0) {
new_buf[i] = b - 1;
} else {
new_buf[i] = b + 1;
}
}
for (let i = 0; i < buflen - rotate; i++) {
inoutbuf.add(i).writeU8(new_buf[i + rotate]);
}
for (let i = 0; i < rotate; i++) {
inoutbuf.add(buflen - rotate + i).writeU8(new_buf[i]);
}
};
const swap_endianness_u16 = (ptr) => {
const bytes = ptr.readU16();
const swapped = [(bytes & 0xff00) >> 8, bytes & 0x00ff];
@@ -72,7 +109,7 @@ export const CommandsByValue = Object.keys(Commands).reduce((acc, cur) => {
return acc;
}, {});
export const reply_Drw = (inbuf, outbuf) => {
const reply_Drw = (inbuf, outbuf) => {
/*
-> cmd = inbuf+10
-> chan = inbuf+9
@@ -87,11 +124,11 @@ export const reply_Drw = (inbuf, outbuf) => {
const chan = inbuf.add(9).readU16();
const cmd = inbuf.add(10).readU16();
const param2 = 0xd2; // ?
const half_len = 1; // FIXME
const bare_ack = Memory.alloc(half_len * 2 + 8);
const half_len = 1; // FIXME u16_swap(inbuf.add(0xc).readU16());
const bare_ack = Memory.alloc(half_len * 2 + 8 + 4); // fixme +4
create_DrwAck(bare_ack, param2, chan, half_len, inbuf);
const hdr_len = pack_P2pHdr(bare_ack, outbuf);
pack_DrwAck(bare_ack + 4, half_len * 2 + 4, outbuf.add(hdr_len));
pack_DrwAck(bare_ack.add(4), half_len * 2 + 4, outbuf.add(hdr_len));
};
const pack_P2pHdr = (inbuf, out_buf) => {
// shitty memcpy
@@ -147,8 +184,6 @@ const create_P2pRdy = (outbuf, inbuf) => {
return P2PRDY_SIZE + 4;
};
create_P2pRdy(new ArrayBuffer(16), ...);
const create_P2pReq = (outbuf, inbuf, m_s_addr, addr_fam) => {
const P2PREQ_SIZE = 0x24;
writeCommand2(Commands.P2pReq, outbuf);
@@ -161,8 +196,7 @@ const create_P2pReq = (outbuf, inbuf, m_s_addr, addr_fam) => {
outbuf.add(2 * 0xf).writeByteArray(swap_endianness_u16(m_s_addr.add(2)));
outbuf.add(2 * 0x12).writeU64(0);
outbuf.add(2 * 0x10).writeByteArray(
swap_endianness_u32(m_s_addr.add(4))); // ip address
outbuf.add(2 * 0x10).writeByteArray(swap_endianness_u32(m_s_addr.add(4))); // ip address
return P2PREQ_SIZE + 4;
};
@@ -192,8 +226,7 @@ const create_LstReq = (outbuf, inbuf) => {
// 0xc * sizeof(short)
outbuf.add(2 * 0xc).writeU32(inbuf.add(0x10).readU32());
return LISTREQ_SIZE +
4; // this is actually wrong (and unused) in the code -- it is 0x1c
return LISTREQ_SIZE + 4; // this is actually wrong (and unused) in the code -- it is 0x1c
};
const create_DrwAck = (outbuf, idk_param2, channel, half_len, inbuf) => {
@@ -210,8 +243,7 @@ const create_DrwAck = (outbuf, idk_param2, channel, half_len, inbuf) => {
};
const dbg_create_Drw = (og_func) => {
const create_Drw =
(outbuf, idk_param2, idk_param3, idk_param4, copy_len, inbuf) => {
const create_Drw = (outbuf, idk_param2, idk_param3, idk_param4, copy_len, inbuf) => {
/// idk_param4 goes up by 0x100 per call
// console.log(
@@ -251,8 +283,7 @@ const dbg_create_Drw = (og_func) => {
const dbg_pack_ClntPkt = (og_func) => {
const pack_ClntPkt = (addr_fam, inbuf, outbuf) => {
const cmd = u16_swap(inbuf.readU16());
console.log(`pack_ClntPkt: cmd 0x${cmd.toString(16)} = ${
CommandsByValue[cmd]}; fam ${addr_fam}; inbuf =>`);
console.log(`pack_ClntPkt: cmd 0x${cmd.toString(16)} = ${CommandsByValue[cmd]}; fam ${addr_fam}; inbuf =>`);
// console.log(inbuf.readByteArray(16));
// const ret = og_func(addr_fam, inbuf, outbuf);
@@ -264,10 +295,8 @@ const dbg_pack_ClntPkt = (og_func) => {
[Commands.LanSearchExt]: () => hdrLen,
[Commands.Close]: () => hdrLen,
[Commands.Hello]: () => hdrLen,
[Commands.P2pReq] : () =>
hdrLen + pack_P2pReq4(inbuf.add(8), outbuf.add(hdrLen)),
[Commands.LstReq] : () =>
hdrLen + pack_P2pId(inbuf.add(8), outbuf.add(hdrLen)),
[Commands.P2pReq]: () => hdrLen + pack_P2pReq4(inbuf.add(8), outbuf.add(hdrLen)),
[Commands.LstReq]: () => hdrLen + pack_P2pId(inbuf.add(8), outbuf.add(hdrLen)),
[Commands.DrwAck]: () => {
const pkt_size = u16_swap(inbuf.add(2).readU16());
return hdrLen + pack_DrwAck(inbuf.add(8), pkt_size, outbuf.add(hdrLen));
@@ -306,8 +335,7 @@ const pack_Drw = (inbuf, m_pkt_size, outbuf) => {
outbuf.writeU8(inbuf.readU8());
outbuf.add(1).writeU8(inbuf.add(1).readU8());
outbuf.add(2).writeU16(inbuf.add(2).readU16());
outbuf.add(4).writeByteArray(
inbuf.add(4).readByteArray(m_pkt_size - DRW_HDR_SIZE));
outbuf.add(4).writeByteArray(inbuf.add(4).readByteArray(m_pkt_size - DRW_HDR_SIZE));
return m_pkt_size;
};
@@ -319,8 +347,7 @@ const pack_DrwAck = (inbuf, m_pkt_size, outbuf) => {
outbuf.writeU8(inbuf.readU8());
outbuf.add(1).writeU8(inbuf.add(1).readU8());
outbuf.add(2).writeU16(inbuf.add(2).readU16());
outbuf.add(4).writeByteArray(
inbuf.add(4).readByteArray(m_pkt_size - DRW_ACK_HDR_SIZE));
outbuf.add(4).writeByteArray(inbuf.add(4).readByteArray(m_pkt_size - DRW_ACK_HDR_SIZE));
return m_pkt_size;
};
@@ -339,7 +366,7 @@ const pack_P2pReq4 = (inbuf, outbuf) => {
return 0x24;
};
export const replace_func = (stub, ret, args) => {
const replace_func = (stub, ret, args) => {
const name_in_elf = stub.name.replace("dbg_", ""); // UGH FIXME
const symbol_addr = DebugSymbol.fromName(name_in_elf).address;
if (symbol_addr == 0) {
@@ -356,11 +383,9 @@ export const replace_func = (stub, ret, args) => {
replacement_func = stub;
}
console.log(
`Replacing ${name_in_elf}, signature "${ret} ${name_in_elf}(${args})"`);
console.log(`Replacing ${name_in_elf}, signature "${ret} ${name_in_elf}(${args})"`);
Interceptor.replace(symbol_addr,
new NativeCallback(replacement_func, ret, args));
Interceptor.replace(symbol_addr, new NativeCallback(replacement_func, ret, args));
};
/* Send_Pkt_LanSearch =
@@ -384,14 +409,8 @@ export const replaceFunctions = () => {
[create_LanSearchExt, "uint8", ["pointer"]],
[create_Hello, "uint8", ["pointer"]],
[create_Close, "uint8", ["pointer"]],
[
dbg_create_Drw, "uint",
[ "pointer", "uint64", "uint8", "uint16", "uint32", "pointer" ]
],
[
create_DrwAck, "uint",
[ "pointer", "uint8", "uint8", "uint16", "pointer" ]
],
[dbg_create_Drw, "uint", ["pointer", "uint64", "uint8", "uint16", "uint32", "pointer"]],
[create_DrwAck, "uint", ["pointer", "uint8", "uint8", "uint16", "pointer"]],
[create_P2pReq, "uint8", ["pointer", "pointer", "pointer", "uint"]],
[create_LstReq, "uint8", ["pointer", "pointer"]],
[create_P2pRdy, "uint8", ["pointer", "pointer"]],
@@ -406,3 +425,18 @@ export const replaceFunctions = () => {
replacements.forEach((x) => replace_func(...x));
return replacements.map((x) => x[0].name.replace("dbg_", ""));
};
const setMemory = (m) => {
global.Memory = m;
};
/*
module.exports = {
replaceFunctions,
u16_swap,
Commands,
CommandsByValue,
reply_Drw,
replace_func,
setMemory,
};
*/
shim.js
+9
View File
@@ -37,3 +37,12 @@ DataView.prototype.readByteArray = function (len) {
}
return ret;
};
const Memory = {
alloc: (len) => new DataView(new ArrayBuffer(len + 1)),
copy: (outbuf, inbuf, len) => outbuf.writeByteArray(inbuf.readByteArray(len)),
};
//module.exports = {
// Memory,
//};
tests/fn.test.js
+91
View File
@@ -0,0 +1,91 @@
import "../shim.js";
import assert from "assert";
import { placeholderTypes, sprintf } from "../utils.js";
import { XqBytesDec, XqBytesEnc } from "../func_replacements.js";
describe("debug_tools", () => {
it("parses printed data", () => {
const fmt = "string: %s, int: %d, float: %f, hexint: %02x, newline: \n\n last int: %d";
const expected_placeholders = ["s", "d", "f", "x", "d"];
const actual_placeholders = placeholderTypes(fmt);
assert.deepEqual(actual_placeholders, expected_placeholders);
});
it("prints data back", () => {
const fmt = "string: %s, int: %d, float: %f, hexint: %02x, newline: \n\n last int: %d";
const in_values = ["potato", 5, 3.5, 0x20, 999];
const expected_string = "string: potato, int: 5, float: 3.5, hexint: 0x20, newline: \n\n last int: 999";
assert.deepEqual(sprintf(fmt, in_values), expected_string);
});
});
describe("module", () => {
const simple_enc_bytes = new Uint8Array([
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00,
]);
const simple_dec_bytes = new Uint8Array([
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
]);
const long_enc_bytes = new Uint8Array([
0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x43, 0x40, 0x55, 0x42, 0x37, 0x31, 0x38, 0x34, 0x32, 0x30, 0x44, 0x59, 0x4d, 0x57, 0x52, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x33, 0x32, 0x35, 0x34,
0x37, 0x36, 0x39, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x31, 0x2f, 0x33, 0x34, 0x34, 0x2f, 0x33, 0x34, 0x34, 0x2f,
0x33, 0x34, 0x34, 0x01, 0x01, 0x01, 0x31, 0x2f, 0x31, 0x2f, 0x31, 0x2f, 0x31, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x31, 0x2f, 0x31, 0x2f, 0x31, 0x2f, 0x31, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x31, 0x2f, 0x31, 0x2f, 0x31, 0x2f, 0x31, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x31, 0x2f, 0x31,
0x2f, 0x31, 0x2f, 0x31, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
]);
const long_dec_bytes = new Uint8Array([
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x41, 0x54, 0x43, 0x36, 0x30, 0x39, 0x35, 0x33, 0x31, 0x45, 0x58, 0x4c, 0x56,
0x53, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x31,
0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x2e, 0x32, 0x35, 0x35, 0x2e,
0x32, 0x35, 0x35, 0x2e, 0x32, 0x35, 0x35, 0x00, 0x00, 0x00, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
]);
it("decrypts simple input", () => {
const in_buf = new DataView(simple_enc_bytes.buffer.slice(0));
XqBytesDec(in_buf, simple_enc_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), simple_dec_bytes);
});
it("decrypts more complex input", () => {
const in_buf = new DataView(long_enc_bytes.buffer.slice(0));
XqBytesDec(in_buf, long_enc_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), long_dec_bytes);
});
it("encrypts simple input", () => {
const in_buf = new DataView(simple_dec_bytes.buffer.slice(0));
XqBytesEnc(in_buf, simple_dec_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), simple_enc_bytes);
});
it("encrypts more complex input", () => {
const in_buf = new DataView(long_dec_bytes.buffer.slice(0));
XqBytesEnc(in_buf, long_dec_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), long_enc_bytes);
});
it("reverts Enc with Dec", () => {
const in_buf = new DataView(long_dec_bytes.buffer.slice(0));
XqBytesEnc(in_buf, long_dec_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), long_enc_bytes); // ENC
XqBytesDec(in_buf, long_dec_bytes.byteLength, 4); // this mutates in_buf
assert.deepEqual(new Uint8Array(in_buf.buffer), long_dec_bytes); //DEC
});
});
utils.js
+23
View File
@@ -0,0 +1,23 @@
const matchy = /%[0-9.-]*([a-z])/g;
const replacy = /(?<pre>.*?)%(?<num>[0-9.-]+)*(?<formatter>[a-z])/gs;
export const placeholderTypes = (str) => {
// '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!'
// =>
// [ 's', 'd', 's', 'd', 's', 'f' ]
return [...str.matchAll(matchy)].map((m) => m[1]);
};
export const sprintf = (str, values) => {
// '%-16s, line %4d, %-16s:ret=%d,broadcast lan_seach to %s:%.3f!!!!' +
// ["asd", 20, ...]
// =>
// asd, line 20, ...
const matches = str.matchAll(replacy);
return [...matches]
.map((m, idx) => {
const cur = values[idx];
const val = m.groups.formatter == "x" ? `0x${cur.toString(16)}` : cur.toString();
return m.groups.pre + val;
})
.join("");
};