srvsvc.ShareInfo502 info502 = new srvsvc.ShareInfo502();
        // Create a minimal valid security descriptor binary
        // Format: revision(1) + sbz1(1) + control(2) + ownerOffset(4) + groupOffset(4) + saclOffset(4) + daclOffset(4) = 20 bytes minimum
        byte[] securityDescriptorBytes = new byte[20];
        securityDescriptorBytes[0] = 1; // revision
        securityDescriptorBytes[1] = 0; // sbz1

        final int daclOffset = ServerMessageBlock.readInt4(buffer, bufferIndex);

        if (ownerUOffset > 0) {
            bufferIndex = start + ownerUOffset;
            owner_user = new SID(buffer, bufferIndex);
            bufferIndex += 28; // ???
        }

        if (ownerGOffset > 0) {
            bufferIndex = start + ownerGOffset;
            owner_group = new SID(buffer, bufferIndex);
            bufferIndex += 28; // ???

        if (ownerUOffset > 0) {
            bufferIndex = start + ownerUOffset;
            this.ownerUserSid = new SID(buffer, bufferIndex);
            bufferIndex += 8 + 4 * this.ownerUserSid.sub_authority_count;
        }

        if (ownerGOffset > 0) {
            bufferIndex = start + ownerGOffset;
            this.ownerGroupSid = new SID(buffer, bufferIndex);