Differential D8888
[client-backup] implement C++ functions for encoding/decoding string in `utf-8` Authored by kamil on Aug 21 2023, 5:03 AM. Tags None Referenced Files
Details To encrypt/decrypt UserData we need to have it in bytes (Uint8Array in JS or uint8_t[] in C++). From JS level it's not that easy because standard TextEncoder from JS is not available in react-native, so we're using JSI capabilities to convert this. Encoding can be done always - any UTF-8 string can be represented as ArrayBuffer. Decoding can be done only if ArrayBuffer has valid code points, to make this check we use this fact: link. Depends on D8887 const str = '!ABC+** /==🤬';
const bytes = commUtilsModule.encodeStringToUTF8ArrayBuffer(str);
const str2 = commUtilsModule.decodeUTF8ArrayBufferToString(
new Uint8Array(bytes).buffer,
);
console.log(str === str2);
try {
console.log(
commUtilsModule.decodeUTF8ArrayBufferToString(
new Uint8Array([72, 101, 108, 108, 111, 0x80]).buffer,
),
);
} catch (e) {
// should fail
console.log(e);
}
try {
console.log(
commUtilsModule.decodeUTF8ArrayBufferToString(
new Uint8Array([72, 101, 108, 0x80, 111, 111]).buffer,
),
);
} catch (e) {
// should fail
console.log(e);
}
try {
console.log(
commUtilsModule.decodeUTF8ArrayBufferToString(
new Uint8Array([0x80, 101, 108, 108, 111]).buffer,
),
);
} catch (e) {
// should fail
console.log(e);
}
try {
console.log(
commUtilsModule.decodeUTF8ArrayBufferToString(
new Uint8Array([72, 101, 108, 108, 111]).buffer,
),
);
} catch (e) {
// should work
console.log(e);
}
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