session-android/src/org/thoughtcrime/securesms/util/EncryptedCharacterCalculator.java
2014-04-10 13:16:14 -07:00

51 lines
2.1 KiB
Java

/**
* Copyright (C) 2011 Whisper Systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.thoughtcrime.securesms.util;
import org.thoughtcrime.securesms.sms.SmsTransportDetails;
public class EncryptedCharacterCalculator extends CharacterCalculator {
private CharacterState calculateSingleRecordCharacters(int charactersSpent) {
int charactersRemaining = SmsTransportDetails.ENCRYPTED_SINGLE_MESSAGE_BODY_MAX_SIZE - charactersSpent;
return new CharacterState(1, charactersRemaining, SmsTransportDetails.ENCRYPTED_SINGLE_MESSAGE_BODY_MAX_SIZE);
}
private CharacterState calculateMultiRecordCharacters(int charactersSpent) {
int charactersInFirstRecord = SmsTransportDetails.ENCRYPTED_SINGLE_MESSAGE_BODY_MAX_SIZE;
int spillover = charactersSpent - charactersInFirstRecord;
int spilloverMessagesSpent = spillover / SmsTransportDetails.MULTI_MESSAGE_MAX_BYTES;
if ((spillover % SmsTransportDetails.MULTI_MESSAGE_MAX_BYTES) > 0)
spilloverMessagesSpent++;
int charactersRemaining = (SmsTransportDetails.MULTI_MESSAGE_MAX_BYTES * spilloverMessagesSpent) - spillover;
return new CharacterState(spilloverMessagesSpent+1, charactersRemaining, SmsTransportDetails.MULTI_MESSAGE_MAX_BYTES);
}
@Override
public CharacterState calculateCharacters(int charactersSpent) {
if (charactersSpent <= SmsTransportDetails.ENCRYPTED_SINGLE_MESSAGE_BODY_MAX_SIZE){
return calculateSingleRecordCharacters(charactersSpent);
} else {
return calculateMultiRecordCharacters(charactersSpent);
}
}
}