Merge "Remove workaround for the ByteBuffer#put issue"

        return rootHash;

    }

    private static void bufferPut(ByteBuffer buffer, byte value) {

        // FIXME(b/72459251): buffer.put(value) does NOT work surprisingly. The position() after put

        // does NOT even change. This hack workaround the problem, but the root cause remains

        // unkonwn yet.  This seems only happen when it goes through the apk install flow on my

        // setup.

        buffer.put(new byte[] { value });

    }

    private static ByteBuffer generateFsverityHeader(ByteBuffer buffer, long fileSize, int depth,

            byte[] salt) {

        if (salt.length != 8) {

        // TODO(b/30972906): update the reference when there is a better one in public.

        buffer.put("TrueBrew".getBytes());  // magic

        bufferPut(buffer, (byte) 1);        // major version

        bufferPut(buffer, (byte) 0);        // minor version

        bufferPut(buffer, (byte) 12);       // log2(block-size): log2(4096)

        bufferPut(buffer, (byte) 7);        // log2(leaves-per-node): log2(4096 / 32)

        buffer.put((byte) 1);               // major version

        buffer.put((byte) 0);               // minor version

        buffer.put((byte) 12);              // log2(block-size): log2(4096)

        buffer.put((byte) 7);               // log2(leaves-per-node): log2(4096 / 32)

        buffer.putShort((short) 1);         // meta algorithm, SHA256_MODE == 1

        buffer.putShort((short) 1);         // data algorithm, SHA256_MODE == 1

        buffer.putLong(fileSize);           // original file size

        bufferPut(buffer, (byte) 0);        // auth block offset, disabled here

        bufferPut(buffer, (byte) 2);        // extension count

        buffer.put((byte) 0);               // auth block offset, disabled here

        buffer.put((byte) 2);               // extension count

        buffer.put(salt);                   // salt (8 bytes)

        // skip(buffer, 22);                // reserved