Moxie Marlinspike
8 years ago
parent
6308e6491a
commit
a4c17e5325
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package org.thoughtcrime.securesms.video;
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import android.media.MediaDataSource;
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import android.os.Build;
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import android.support.annotation.RequiresApi;
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import org.thoughtcrime.securesms.crypto.DecryptingPartInputStream;
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import org.thoughtcrime.securesms.crypto.MasterSecret;
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import org.thoughtcrime.securesms.util.Util;
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import java.io.File;
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import java.io.IOException;
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@RequiresApi(api = Build.VERSION_CODES.M)
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public class EncryptedMediaDataSource extends MediaDataSource {
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private final File mediaFile;
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private final MasterSecret masterSecret;
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public EncryptedMediaDataSource(MasterSecret masterSecret, File mediaFile) {
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this.mediaFile = mediaFile;
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this.masterSecret = masterSecret;
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}
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@Override
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public int readAt(long position, byte[] bytes, int offset, int length) throws IOException {
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DecryptingPartInputStream inputStream = new DecryptingPartInputStream(mediaFile, masterSecret);
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byte[] buffer = new byte[4096];
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long headerRemaining = position;
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while (headerRemaining > 0) {
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int read = inputStream.read(buffer, 0, Util.toIntExact(Math.min((long)buffer.length, headerRemaining)));
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if (read == -1) return -1;
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headerRemaining -= read;
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}
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int returnValue = inputStream.read(bytes, offset, length);
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inputStream.close();
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return returnValue;
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}
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@Override
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public long getSize() throws IOException {
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DecryptingPartInputStream inputStream = new DecryptingPartInputStream(mediaFile, masterSecret);
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byte[] buffer = new byte[4096];
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long size = 0;
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int read;
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while ((read = inputStream.read(buffer)) != -1) {
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size += read;
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}
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return size;
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}
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@Override
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public void close() throws IOException {
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}
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}
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