/*

 * Copyright 2023 Richard Hughes <richard@hughsie.com>

 *

 * SPDX-License-Identifier: LGPL-2.1-or-later

 */

#define G_LOG_DOMAIN "FuEfiDevicePath"

#include "config.h"

#include "fu-byte-array.h"

#include "fu-efi-device-path-list.h"

#include "fu-efi-file-path-device-path.h"

#include "fu-efi-hard-drive-device-path.h"

#include "fu-efi-struct.h"

#include "fu-input-stream.h"

struct _FuEfiDevicePathList {

  FuFirmware parent_instance;

};

static void

fu_efi_device_path_list_codec_iface_init(FwupdCodecInterface *iface);

G_DEFINE_TYPE_EXTENDED(FuEfiDevicePathList,

           fu_efi_device_path_list,

           FU_TYPE_FIRMWARE,

           0,

           G_IMPLEMENT_INTERFACE(FWUPD_TYPE_CODEC,

               fu_efi_device_path_list_codec_iface_init))

#define FU_EFI_DEVICE_PATH_LIST_IMAGES_MAX 1000u

static const gchar *

fu_efi_device_path_list_gtype_to_member_name(GType gtype)

{

  if (gtype == FU_TYPE_EFI_DEVICE_PATH)

    return "Dp";

  if (gtype == FU_TYPE_EFI_FILE_PATH_DEVICE_PATH)

    return "Fp";

  if (gtype == FU_TYPE_EFI_HARD_DRIVE_DEVICE_PATH)

    return "Hd";

  return g_type_name(gtype);

}

static void

fu_efi_device_path_list_add_json(FwupdCodec *codec, JsonBuilder *builder, FwupdCodecFlags flags)

{

  FuFirmware *firmware = FU_FIRMWARE(codec);

  g_autoptr(GPtrArray) imgs = fu_firmware_get_images(firmware);

  json_builder_set_member_name(builder, "DPs");

  json_builder_begin_array(builder);

  for (guint i = 0; i < imgs->len; i++) {

    FuFirmware *img = g_ptr_array_index(imgs, i);

    json_builder_begin_object(builder);

    json_builder_set_member_name(

        builder,

        fu_efi_device_path_list_gtype_to_member_name(G_OBJECT_TYPE(img)));

    json_builder_begin_object(builder);

    fwupd_codec_to_json(FWUPD_CODEC(img), builder, flags);

    json_builder_end_object(builder);

    json_builder_end_object(builder);

  }

  json_builder_end_array(builder);

}

static gboolean

fu_efi_device_path_list_parse(FuFirmware *firmware,

            GInputStream *stream,

            FuFirmwareParseFlags flags,

            GError **error)

{

  gsize offset = 0;

  gsize streamsz = 0;

  if (!fu_input_stream_size(stream, &streamsz, error))

    return FALSE;

  while (offset < streamsz) {

    g_autoptr(FuEfiDevicePath) efi_dp = NULL;

    g_autoptr(FuStructEfiDevicePath) st_dp = NULL;

    /* parse the header so we can work out what GType to create */

    st_dp = fu_struct_efi_device_path_parse_stream(stream, offset, error);

    if (st_dp == NULL)

      return FALSE;

    if (fu_struct_efi_device_path_get_type(st_dp) == FU_EFI_DEVICE_PATH_TYPE_END)

      break;

    if (fu_struct_efi_device_path_get_type(st_dp) == FU_EFI_DEVICE_PATH_TYPE_MEDIA &&

        fu_struct_efi_device_path_get_subtype(st_dp) ==

      FU_EFI_HARD_DRIVE_DEVICE_PATH_SUBTYPE_FILE_PATH) {

      efi_dp = FU_EFI_DEVICE_PATH(fu_efi_file_path_device_path_new());

    } else if (fu_struct_efi_device_path_get_type(st_dp) ==

             FU_EFI_DEVICE_PATH_TYPE_MEDIA &&

         fu_struct_efi_device_path_get_subtype(st_dp) ==

             FU_EFI_HARD_DRIVE_DEVICE_PATH_SUBTYPE_HARD_DRIVE) {

      efi_dp = FU_EFI_DEVICE_PATH(fu_efi_hard_drive_device_path_new());

    } else {

      efi_dp = fu_efi_device_path_new();

    }

    fu_firmware_set_offset(FU_FIRMWARE(efi_dp), offset);

    if (!fu_firmware_parse_stream(FU_FIRMWARE(efi_dp), stream, offset, flags, error))

      return FALSE;

    if (!fu_firmware_add_image(firmware, FU_FIRMWARE(efi_dp), error))

      return FALSE;

    offset += fu_firmware_get_size(FU_FIRMWARE(efi_dp));

  }

  /* success */

  return TRUE;

}

static GByteArray *

fu_efi_device_path_list_write(FuFirmware *firmware, GError **error)

{

  g_autoptr(GPtrArray) imgs = fu_firmware_get_images(firmware);

  g_autoptr(GByteArray) buf = g_byte_array_new();

  g_autoptr(FuStructEfiDevicePath) st_dp_end = NULL;

  /* add each image */

  for (guint i = 0; i < imgs->len; i++) {

    FuFirmware *img = g_ptr_array_index(imgs, i);

    g_autoptr(GBytes) dp_blob = fu_firmware_write(img, error);

    if (dp_blob == NULL)

      return NULL;

    fu_byte_array_append_bytes(buf, dp_blob);

  }

  /* add end marker */

  st_dp_end = fu_struct_efi_device_path_new();

  fu_struct_efi_device_path_set_type(st_dp_end, FU_EFI_DEVICE_PATH_TYPE_END);

  fu_struct_efi_device_path_set_subtype(st_dp_end, 0xFF);

  fu_byte_array_append_array(buf, st_dp_end->buf);

  /* success */

  return g_steal_pointer(&buf);

}

static void

fu_efi_device_path_list_codec_iface_init(FwupdCodecInterface *iface)

{

  iface->add_json = fu_efi_device_path_list_add_json;

}

static void

fu_efi_device_path_list_class_init(FuEfiDevicePathListClass *klass)

{

  FuFirmwareClass *firmware_class = FU_FIRMWARE_CLASS(klass);

  firmware_class->parse = fu_efi_device_path_list_parse;

  firmware_class->write = fu_efi_device_path_list_write;

}

static void

fu_efi_device_path_list_init(FuEfiDevicePathList *self)

{

  g_type_ensure(FU_TYPE_EFI_FILE_PATH_DEVICE_PATH);

  g_type_ensure(FU_TYPE_EFI_HARD_DRIVE_DEVICE_PATH);

  fu_firmware_set_images_max(FU_FIRMWARE(self), FU_EFI_DEVICE_PATH_LIST_IMAGES_MAX);

}

/**

 * fu_efi_device_path_list_new:

 *

 * Creates a new EFI DEVICE_PATH list.

 *

 * Returns: (transfer full): a #FuEfiDevicePathList

 *

 * Since: 1.9.3

 **/

FuEfiDevicePathList *

fu_efi_device_path_list_new(void)

{

  return g_object_new(FU_TYPE_EFI_DEVICE_PATH_LIST, NULL);

}