2022-01-31 13:02:34 +03:00
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import 'dart:math';
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2022-07-06 16:22:15 +03:00
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import '../../widgets/utf8_utils.dart';
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2022-01-31 13:02:34 +03:00
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import '../models.dart';
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import '../../core/models.dart';
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/// Calculates the available space for issuer and account name.
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///
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/// Returns a [Pair] of the space available for the issuer and account name,
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/// respectively, based on the current state of the credential.
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Pair<int, int> getRemainingKeySpace(
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{required OathType oathType,
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required int period,
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required String issuer,
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required String name}) {
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int remaining = 64; // The field is 64 bytes in total.
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if (oathType == OathType.totp && period != defaultPeriod) {
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// Non-standard TOTP periods are stored as part of this data, as a "D/"- prefix.
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remaining -= '$period/'.length;
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}
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2022-07-06 16:22:15 +03:00
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int issuerSpace = byteLength(issuer);
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2022-01-31 13:02:34 +03:00
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if (issuer.isNotEmpty) {
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// Issuer is separated from name with a ":", if present.
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issuerSpace += 1;
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}
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return Pair(
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// Always reserve at least one character for name
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2022-07-06 16:22:15 +03:00
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remaining - 1 - max(byteLength(name), 1),
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2022-01-31 13:02:34 +03:00
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remaining - issuerSpace,
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);
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}
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