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Manually calculate length of attachments if they're super old

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Fixes #7560
This commit is contained in:
Moxie Marlinspike 2018-04-02 10:03:26 -07:00
parent 2c82b3610d
commit b9f99f9941
1 changed files with 22 additions and 2 deletions
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24
src/org/thoughtcrime/securesms/backup/FullBackupExporter.java
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@ -20,7 +20,6 @@ import org.thoughtcrime.securesms.crypto.AttachmentSecret;
import org.thoughtcrime.securesms.crypto.ClassicDecryptingPartInputStream;
import org.thoughtcrime.securesms.crypto.IdentityKeyUtil;
import org.thoughtcrime.securesms.crypto.ModernDecryptingPartInputStream;
import org.thoughtcrime.securesms.database.Address;
import org.thoughtcrime.securesms.database.AttachmentDatabase;
import org.thoughtcrime.securesms.database.MmsDatabase;
import org.thoughtcrime.securesms.database.MmsSmsColumns;
@ -190,7 +189,11 @@ public class FullBackupExporter extends FullBackupBase {
String data = cursor.getString(cursor.getColumnIndexOrThrow(AttachmentDatabase.DATA));
byte[] random = cursor.getBlob(cursor.getColumnIndexOrThrow(AttachmentDatabase.DATA_RANDOM));
if (!TextUtils.isEmpty(data)) {
if (!TextUtils.isEmpty(data) && size <= 0) {
size = calculateVeryOldStreamLength(attachmentSecret, random, data);
}
if (!TextUtils.isEmpty(data) && size > 0) {
InputStream inputStream;
if (random != null && random.length == 32) inputStream = ModernDecryptingPartInputStream.createFor(attachmentSecret, random, new File(data), 0);
@ -203,6 +206,23 @@ public class FullBackupExporter extends FullBackupBase {
}
}
private static long calculateVeryOldStreamLength(@NonNull AttachmentSecret attachmentSecret, @Nullable byte[] random, @NonNull String data) throws IOException {
long result = 0;
InputStream inputStream;
if (random != null && random.length == 32) inputStream = ModernDecryptingPartInputStream.createFor(attachmentSecret, random, new File(data), 0);
else inputStream = ClassicDecryptingPartInputStream.createFor(attachmentSecret, new File(data));
int read;
byte[] buffer = new byte[8192];
while ((read = inputStream.read(buffer, 0, buffer.length)) != -1) {
result += read;
}
return result;
}
private static class BackupFrameOutputStream extends BackupStream {
private final OutputStream outputStream;