pkt_transform.h

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// Copyright (C) 2012-2026 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef PKT_TRANSFORM_H
#define PKT_TRANSFORM_H
 
#include <perfdhcp/localized_option.h>
 
#include <dhcp/option.h>
 
namespace isc {
namespace perfdhcp {

class PktTransform {
public:

    static bool pack(const dhcp::Option::Universe universe,
                     const dhcp::OptionBuffer& in_buffer,
                     const dhcp::OptionCollection& options,
                     const size_t transid_offset,
                     const uint32_t transid,
                     util::OutputBuffer& out_buffer);

    static bool unpack(const dhcp::Option::Universe universe,
                       const dhcp::OptionBuffer& in_buffer,
                       const dhcp::OptionCollection& options,
                       const size_t transid_offset,
                       uint32_t& transid);

    static void writeAt(dhcp::OptionBuffer& in_buffer, size_t dest_pos,
                        std::vector<uint8_t>::iterator first,
                        std::vector<uint8_t>::iterator last);

    template<typename T>
    static void writeValueAt(dhcp::OptionBuffer& in_buffer, size_t dest_pos,
                             T val) {
        if (in_buffer.size() < dest_pos + sizeof(T)) {
            isc_throw(isc::OutOfRange, "writeValueAt: pos=" << dest_pos
                      << ", length=" << sizeof(T)
                      << ", size=" << in_buffer.size());
        }
        // @todo consider replacing the loop with switch statement
        // checking sizeof(T).
        for (size_t i = 0; i < sizeof(T); ++i) {
            in_buffer[dest_pos + i] = (val >> 8 * (sizeof(T) - i - 1)) & 0xFF;
        }
    }
 
private:
    static void packOptions(const dhcp::OptionBuffer& in_buffer,
                            const dhcp::OptionCollection& options,
                            util::OutputBuffer& out_buffer);

    static void unpackOptions(const dhcp::OptionBuffer& in_buffer,
                              const dhcp::OptionCollection& options);
 
};
 
} // namespace perfdhcp
} // namespace isc
 
#endif // PKT_TRANSFORM_H