/*

 * Copyright 2012 Andrew Duggan

 * Copyright 2012 Synaptics Inc.

 * Copyright 2019 Richard Hughes <richard@hughsie.com>

 *

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

 */

#include "config.h"

#include <string.h>

#include "fu-synaptics-rmi-common.h"

#include "fu-synaptics-rmi-firmware.h"

#include "fu-synaptics-rmi-struct.h"

typedef enum {

  RMI_FIRMWARE_KIND_UNKNOWN = 0x00,

  RMI_FIRMWARE_KIND_0X = 0x01,

  RMI_FIRMWARE_KIND_10 = 0x10,

  RMI_FIRMWARE_KIND_LAST,

} RmiFirmwareKind;

struct _FuSynapticsRmiFirmware {

  FuFirmware parent_instance;

  RmiFirmwareKind kind;

  guint32 checksum;

  guint8 io;

  guint8 bootloader_version;

  guint32 build_id;

  guint32 package_id;

  guint16 product_info;

  gchar *product_id;

  guint32 sig_size;

};

G_DEFINE_TYPE(FuSynapticsRmiFirmware, fu_synaptics_rmi_firmware, FU_TYPE_FIRMWARE)

#define RMI_IMG_FW_OFFSET 0x100

#define RMI_IMG_V10_CNTR_ADDR_OFFSET 0x0c

#define RMI_IMG_MAX_CONTAINERS       1024

static gboolean

fu_synaptics_rmi_firmware_add_image(FuFirmware *firmware,

            const gchar *id,

            GInputStream *stream,

            gsize offset,

            gsize bufsz,

            FuFirmwareParseFlags flags,

            GError **error)

{

  g_autoptr(FuFirmware) img = fu_firmware_new();

  g_autoptr(GInputStream) partial_stream = NULL;

  partial_stream = fu_partial_input_stream_new(stream, offset, bufsz, error);

  if (partial_stream == NULL)

    return FALSE;

  if (!fu_firmware_parse_stream(img, partial_stream, 0x0, flags, error))

    return FALSE;

  fu_firmware_set_id(img, id);

  return fu_firmware_add_image_full(firmware, img, error);

}

static gboolean

fu_synaptics_rmi_firmware_add_image_v10(FuFirmware *firmware,

          const gchar *id,

          GInputStream *stream,

          gsize offset,

          gsize bufsz,

          gsize sig_sz,

          FuFirmwareParseFlags flags,

          GError **error)

{

  if (!fu_synaptics_rmi_firmware_add_image(firmware, id, stream, offset, bufsz, flags, error))

    return FALSE;

  if (sig_sz != 0) {

    g_autoptr(GInputStream) partial_stream = NULL;

    g_autoptr(FuFirmware) img = fu_firmware_new();

    g_autofree gchar *sig_id = NULL;

    partial_stream = fu_partial_input_stream_new(stream, offset + bufsz, sig_sz, error);

    if (partial_stream == NULL)

      return FALSE;

    if (!fu_firmware_parse_stream(img, partial_stream, 0x0, flags, error))

      return FALSE;

    sig_id = g_strdup_printf("%s-signature", id);

    fu_firmware_set_id(img, sig_id);

    fu_firmware_add_image(firmware, img);

  }

  return TRUE;

}

static void

fu_synaptics_rmi_firmware_export(FuFirmware *firmware,

         FuFirmwareExportFlags flags,

         XbBuilderNode *bn)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  fu_xmlb_builder_insert_kx(bn, "kind", self->kind);

  fu_xmlb_builder_insert_kv(bn, "product_id", self->product_id);

  if (flags & FU_FIRMWARE_EXPORT_FLAG_INCLUDE_DEBUG) {

    fu_xmlb_builder_insert_kx(bn, "bootloader_version", self->bootloader_version);

    fu_xmlb_builder_insert_kx(bn, "io", self->io);

    fu_xmlb_builder_insert_kx(bn, "checksum", self->checksum);

    fu_xmlb_builder_insert_kx(bn, "build_id", self->build_id);

    fu_xmlb_builder_insert_kx(bn, "package_id", self->package_id);

    fu_xmlb_builder_insert_kx(bn, "product_info", self->product_info);

    fu_xmlb_builder_insert_kx(bn, "sig_size", self->sig_size);

  }

}

static gboolean

fu_synaptics_rmi_firmware_parse_v10(FuFirmware *firmware,

            GInputStream *stream,

            FuFirmwareParseFlags flags,

            GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  guint16 container_id;

  guint32 cntrs_len;

  guint32 offset;

  guint32 cntr_addr;

  guint8 product_id[RMI_PRODUCT_ID_LENGTH] = {0x0};

  gsize bufsz = 0;

  const guint8 *buf;

  guint32 signature_size;

  g_autoptr(GByteArray) st_dsc = NULL;

  g_autoptr(GBytes) fw = NULL;

  /* maybe stream later */

  fw = fu_input_stream_read_bytes(stream, 0, G_MAXSIZE, NULL, error);

  if (fw == NULL)

    return FALSE;

  buf = g_bytes_get_data(fw, &bufsz);

  if (!fu_memread_uint32_safe(buf,

            bufsz,

            RMI_IMG_V10_CNTR_ADDR_OFFSET,

            &cntr_addr,

            G_LITTLE_ENDIAN,

            error))

    return FALSE;

  g_debug("v10 RmiContainerDescriptor at 0x%x", cntr_addr);

  st_dsc = fu_struct_rmi_container_descriptor_parse_stream(stream, cntr_addr, error);

  if (st_dsc == NULL) {

    g_prefix_error(error, "RmiContainerDescriptor invalid: ");

    return FALSE;

  }

  if (bufsz < sizeof(guint32) + st_dsc->len) {

    g_set_error_literal(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "stream was too small");

    return FALSE;

  }

  container_id = fu_struct_rmi_container_descriptor_get_container_id(st_dsc);

  if (container_id != FU_RMI_CONTAINER_ID_TOP_LEVEL) {

    g_set_error(error,

          FWUPD_ERROR,

          FWUPD_ERROR_INVALID_FILE,

          "toplevel container_id invalid, got 0x%x expected 0x%x",

          (guint)container_id,

          (guint)FU_RMI_CONTAINER_ID_TOP_LEVEL);

    return FALSE;

  }

  offset = fu_struct_rmi_container_descriptor_get_content_address(st_dsc);

  if (offset > bufsz - sizeof(guint32) - st_dsc->len) {

    g_set_error(error,

          FWUPD_ERROR,

          FWUPD_ERROR_INVALID_FILE,

          "image offset invalid, got 0x%x, size 0x%x",

          (guint)offset,

          (guint)bufsz);

    return FALSE;

  }

  cntrs_len = fu_struct_rmi_container_descriptor_get_content_length(st_dsc) / 4;

  if (cntrs_len > RMI_IMG_MAX_CONTAINERS) {

    g_set_error(error,

          FWUPD_ERROR,

          FWUPD_ERROR_INVALID_FILE,

          "too many containers in file [%u], maximum is %u",

          cntrs_len,

          (guint)RMI_IMG_MAX_CONTAINERS);

    return FALSE;

  }

  g_debug("offset=0x%x (cntrs_len=%u)", offset, cntrs_len);

  for (guint32 i = 0; i < cntrs_len; i++) {

    guint32 content_addr;

    guint32 addr;

    guint32 length;

    g_autoptr(GByteArray) st_dsc2 = NULL;

    if (!fu_memread_uint32_safe(buf, bufsz, offset, &addr, G_LITTLE_ENDIAN, error))

      return FALSE;

    g_debug("parsing RmiContainerDescriptor at 0x%x", addr);

    st_dsc2 = fu_struct_rmi_container_descriptor_parse_stream(stream, addr, error);

    if (st_dsc2 == NULL)

      return FALSE;

    container_id = fu_struct_rmi_container_descriptor_get_container_id(st_dsc2);

    content_addr = fu_struct_rmi_container_descriptor_get_content_address(st_dsc2);

    length = fu_struct_rmi_container_descriptor_get_content_length(st_dsc2);

    signature_size = fu_struct_rmi_container_descriptor_get_signature_size(st_dsc2);

    g_debug("RmiContainerDescriptor 0x%02x @ 0x%x (len 0x%x) sig_size 0x%x",

      container_id,

      content_addr,

      length,

      signature_size);

    if (length == 0 || length > bufsz) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "length invalid, length 0x%x, size 0x%x",

            (guint)length,

            (guint)bufsz);

      return FALSE;

    }

    if (content_addr > bufsz - length) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "address invalid, got 0x%x (length 0x%x), size 0x%x",

            (guint)content_addr,

            (guint)length,

            (guint)bufsz);

      return FALSE;

    }

    switch (container_id) {

    case FU_RMI_CONTAINER_ID_BL:

      if (!fu_memread_uint8_safe(buf,

               bufsz,

               content_addr,

               &self->bootloader_version,

               error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_UI:

    case FU_RMI_CONTAINER_ID_CORE_CODE:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "ui",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_FLASH_CONFIG:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "flash-config",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_UI_CONFIG:

    case FU_RMI_CONTAINER_ID_CORE_CONFIG:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "config",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_FIXED_LOCATION_DATA:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "fixed-location-data",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_EXTERNAL_TOUCH_AFE_CONFIG:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "afe-config",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_DISPLAY_CONFIG:

      if (!fu_synaptics_rmi_firmware_add_image_v10(firmware,

                     "display-config",

                     stream,

                     content_addr,

                     length,

                     signature_size,

                     flags,

                     error))

        return FALSE;

      break;

    case FU_RMI_CONTAINER_ID_GENERAL_INFORMATION:

      if (length < 0x18 + RMI_PRODUCT_ID_LENGTH) {

        g_set_error(error,

              FWUPD_ERROR,

              FWUPD_ERROR_INVALID_FILE,

              "content_addr invalid, got 0x%x (length 0x%x)",

              content_addr,

              (guint)length);

        return FALSE;

      }

      g_clear_pointer(&self->product_id, g_free);

      self->io = 1;

      if (!fu_memread_uint32_safe(buf,

                bufsz,

                content_addr,

                &self->package_id,

                G_LITTLE_ENDIAN,

                error))

        return FALSE;

      if (!fu_memread_uint32_safe(buf,

                bufsz,

                content_addr + 0x04,

                &self->build_id,

                G_LITTLE_ENDIAN,

                error))

        return FALSE;

      if (!fu_memcpy_safe(product_id,

              sizeof(product_id),

              0x0, /* dst */

              buf,

              bufsz,

              content_addr + 0x18, /* src */

              sizeof(product_id),

              error))

        return FALSE;

      break;

    default:

      g_debug("unsupported container %s [0x%02x]",

        fu_rmi_container_id_to_string(container_id),

        container_id);

      break;

    }

    offset += 4;

  }

  if (product_id[0] != '\0') {

    g_free(self->product_id);

    self->product_id = g_strndup((const gchar *)product_id, sizeof(product_id));

  }

  return TRUE;

}

static gboolean

fu_synaptics_rmi_firmware_parse_v0x(FuFirmware *firmware,

            GInputStream *stream,

            FuFirmwareParseFlags flags,

            GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  guint32 cfg_sz;

  guint32 img_sz;

  g_autoptr(GByteArray) st_img = NULL;

  /* main firmware */

  st_img = fu_struct_rmi_img_parse_stream(stream, 0x0, error);

  if (st_img == NULL)

    return FALSE;

  img_sz = fu_struct_rmi_img_get_image_size(st_img);

  if (img_sz > 0) {

    /* payload, then signature appended */

    if (self->sig_size > 0) {

      guint32 sig_offset = img_sz - self->sig_size;

      if (!fu_synaptics_rmi_firmware_add_image(firmware,

                 "sig",

                 stream,

                 RMI_IMG_FW_OFFSET + sig_offset,

                 self->sig_size,

                 flags,

                 error))

        return FALSE;

    }

    if (!fu_synaptics_rmi_firmware_add_image(firmware,

               "ui",

               stream,

               RMI_IMG_FW_OFFSET,

               img_sz,

               flags,

               error))

      return FALSE;

  }

  /* config */

  cfg_sz = fu_struct_rmi_img_get_config_size(st_img);

  if (cfg_sz > 0) {

    if (!fu_synaptics_rmi_firmware_add_image(firmware,

               "config",

               stream,

               RMI_IMG_FW_OFFSET + img_sz,

               cfg_sz,

               flags,

               error))

      return FALSE;

  }

  return TRUE;

}

static gboolean

fu_synaptics_rmi_firmware_parse(FuFirmware *firmware,

        GInputStream *stream,

        FuFirmwareParseFlags flags,

        GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  gsize bufsz = 0;

  const guint8 *buf;

  g_autoptr(GByteArray) st_img = NULL;

  g_autoptr(GBytes) fw = NULL;

  /* maybe stream later */

  fw = fu_input_stream_read_bytes(stream, 0x0, G_MAXSIZE, NULL, error);

  if (fw == NULL)

    return FALSE;

  buf = g_bytes_get_data(fw, &bufsz);

  /* sanity check */

  st_img = fu_struct_rmi_img_parse_stream(stream, 0x0, error);

  if (st_img == NULL)

    return FALSE;

  if (bufsz % 2 != 0) {

    g_set_error_literal(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "data not aligned to 16 bits");

    return FALSE;

  }

  if (bufsz < 4) {

    g_set_error_literal(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "stream was too small");

    return FALSE;

  }

  /* verify checksum */

  self->checksum = fu_struct_rmi_img_get_checksum(st_img);

  if ((flags & FU_FIRMWARE_PARSE_FLAG_IGNORE_CHECKSUM) == 0) {

    guint32 checksum_calculated =

        fu_synaptics_rmi_generate_checksum(buf + 4, bufsz - 4);

    if (self->checksum != checksum_calculated) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_FILE,

            "checksum verification failed, got 0x%08x, actual 0x%08x",

            (guint)self->checksum,

            (guint)checksum_calculated);

      return FALSE;

    }

  }

  /* parse legacy image */

  g_clear_pointer(&self->product_id, g_free);

  self->io = fu_struct_rmi_img_get_io_offset(st_img);

  self->bootloader_version = fu_struct_rmi_img_get_bootloader_version(st_img);

  if (self->io == 1) {

    self->build_id = fu_struct_rmi_img_get_fw_build_id(st_img);

    self->package_id = fu_struct_rmi_img_get_package_id(st_img);

  }

  self->product_id = fu_struct_rmi_img_get_product_id(st_img);

  self->product_info = fu_struct_rmi_img_get_product_info(st_img);

  fu_firmware_set_size(firmware, fu_struct_rmi_img_get_image_size(st_img));

  /* parse partitions, but ignore lockdown */

  switch (self->bootloader_version) {

  case 2:

  case 3:

  case 4:

  case 5:

  case 6:

    if ((self->io & 0x10) >> 1)

      self->sig_size = fu_struct_rmi_img_get_signature_size(st_img);

    if (!fu_synaptics_rmi_firmware_parse_v0x(firmware, stream, flags, error))

      return FALSE;

    self->kind = RMI_FIRMWARE_KIND_0X;

    break;

  case 16:

  case 17:

    if (!fu_synaptics_rmi_firmware_parse_v10(firmware, stream, flags, error))

      return FALSE;

    self->kind = RMI_FIRMWARE_KIND_10;

    break;

  default:

    g_set_error(error,

          FWUPD_ERROR,

          FWUPD_ERROR_INVALID_FILE,

          "unsupported image version 0x%02x",

          self->bootloader_version);

    return FALSE;

  }

  /* success */

  return TRUE;

}

guint32

fu_synaptics_rmi_firmware_get_sig_size(FuSynapticsRmiFirmware *self)

{

  return self->sig_size;

}

static GByteArray *

fu_synaptics_rmi_firmware_write_v0x(FuFirmware *firmware, GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  gsize bufsz = 0;

  guint32 csum;

  g_autoptr(FuFirmware) img = NULL;

  g_autoptr(GByteArray) buf = g_byte_array_new();

  g_autoptr(GByteArray) st_img = fu_struct_rmi_img_new();

  g_autoptr(GBytes) buf_blob = NULL;

  /* default image */

  img = fu_firmware_get_image_by_id(firmware, "ui", error);

  if (img == NULL)

    return NULL;

  buf_blob = fu_firmware_write(img, error);

  if (buf_blob == NULL)

    return NULL;

  bufsz = g_bytes_get_size(buf_blob);

  /* create empty block */

  fu_struct_rmi_img_set_bootloader_version(st_img, 0x2); /* not hierarchical */

  if (self->product_id != NULL) {

    if (!fu_struct_rmi_img_set_product_id(st_img, self->product_id, error))

      return NULL;

  }

  fu_struct_rmi_img_set_product_info(st_img, 0x1234);

  fu_struct_rmi_img_set_image_size(st_img, bufsz);

  fu_struct_rmi_img_set_config_size(st_img, bufsz);

  g_byte_array_append(buf, st_img->data, st_img->len);

  fu_byte_array_set_size(buf, RMI_IMG_FW_OFFSET + 0x4 + bufsz, 0x00);

  fu_memwrite_uint32(buf->data + RMI_IMG_FW_OFFSET, 0xDEAD, G_LITTLE_ENDIAN); /* img */

  fu_memwrite_uint32(buf->data + RMI_IMG_FW_OFFSET + bufsz,

         0xBEEF,

         G_LITTLE_ENDIAN); /* config */

  /* fixup checksum */

  csum = fu_synaptics_rmi_generate_checksum(buf->data + 4, buf->len - 4);

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_CHECKSUM, csum, G_LITTLE_ENDIAN);

  /* success */

  return g_steal_pointer(&buf);

}

static GByteArray *

fu_synaptics_rmi_firmware_write_v10(FuFirmware *firmware, GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  gsize bufsz;

  guint32 csum;

  g_autoptr(FuFirmware) img = NULL;

  g_autoptr(GByteArray) buf = g_byte_array_new();

  g_autoptr(GByteArray) desc_hdr = fu_struct_rmi_container_descriptor_new();

  g_autoptr(GByteArray) desc = fu_struct_rmi_container_descriptor_new();

  g_autoptr(GBytes) buf_blob = NULL;

  /* header | desc_hdr | offset_table | desc | flash_config |

   *        \0x0       \0x20          \0x24  \0x44          |0x48 */

  guint32 offset_table[] = {/* offset to first descriptor */

          GUINT32_TO_LE(RMI_IMG_FW_OFFSET + 0x24)}; /* nocheck:blocked */

  fu_struct_rmi_container_descriptor_set_container_id(desc, FU_RMI_CONTAINER_ID_FLASH_CONFIG);

  fu_struct_rmi_container_descriptor_set_content_address(desc, RMI_IMG_FW_OFFSET + 0x44);

  /* default image */

  img = fu_firmware_get_image_by_id(firmware, "ui", error);

  if (img == NULL)

    return NULL;

  buf_blob = fu_firmware_write(img, error);

  if (buf_blob == NULL)

    return NULL;

  bufsz = g_bytes_get_size(buf_blob);

  fu_struct_rmi_container_descriptor_set_content_length(desc, bufsz);

  /* create empty block */

  fu_byte_array_set_size(buf, RMI_IMG_FW_OFFSET + 0x48, 0x00);

  buf->data[FU_STRUCT_RMI_IMG_OFFSET_IO_OFFSET] = 0x1;

  buf->data[FU_STRUCT_RMI_IMG_OFFSET_BOOTLOADER_VERSION] = 16; /* hierarchical */

  if (self->product_id != NULL) {

    gsize product_id_sz = strlen(self->product_id);

    if (!fu_memcpy_safe(buf->data,

            buf->len,

            FU_STRUCT_RMI_IMG_OFFSET_PRODUCT_ID, /* dst */

            (const guint8 *)self->product_id,

            product_id_sz,

            0x0, /* src */

            product_id_sz,

            error))

      return NULL;

  }

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_FW_BUILD_ID,

         0x1234,

         G_LITTLE_ENDIAN);

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_PACKAGE_ID,

         0x4321,

         G_LITTLE_ENDIAN);

  fu_memwrite_uint16(buf->data + FU_STRUCT_RMI_IMG_OFFSET_PRODUCT_INFO,

         0x3456,

         G_LITTLE_ENDIAN);

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_IMAGE_SIZE, bufsz, G_LITTLE_ENDIAN);

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_CONFIG_SIZE,

         bufsz,

         G_LITTLE_ENDIAN);

  fu_memwrite_uint32(buf->data + RMI_IMG_V10_CNTR_ADDR_OFFSET,

         RMI_IMG_FW_OFFSET,

         G_LITTLE_ENDIAN);

  /* hierarchical section */

  fu_struct_rmi_container_descriptor_set_container_id(desc_hdr,

                  FU_RMI_CONTAINER_ID_TOP_LEVEL);

  fu_struct_rmi_container_descriptor_set_content_length(desc_hdr, 0x1 * 4); /* bytes */

  fu_struct_rmi_container_descriptor_set_content_address(desc_hdr,

                     RMI_IMG_FW_OFFSET +

                   0x20); /* offset to table */

  memcpy(buf->data + RMI_IMG_FW_OFFSET + 0x00,        /* nocheck:blocked */

         desc_hdr->data,

         desc_hdr->len);

  memcpy(buf->data + RMI_IMG_FW_OFFSET + 0x20, /* nocheck:blocked */

         offset_table,

         sizeof(offset_table));

  memcpy(buf->data + RMI_IMG_FW_OFFSET + 0x24, /* nocheck:blocked */

         desc->data,

         desc->len);

  fu_memwrite_uint32(buf->data + RMI_IMG_FW_OFFSET + 0x44,

         0xfeed,

         G_LITTLE_ENDIAN); /* flash_config */

  /* fixup checksum */

  csum = fu_synaptics_rmi_generate_checksum(buf->data + 4, buf->len - 4);

  fu_memwrite_uint32(buf->data + FU_STRUCT_RMI_IMG_OFFSET_CHECKSUM, csum, G_LITTLE_ENDIAN);

  /* success */

  return g_steal_pointer(&buf);

}

static gboolean

fu_synaptics_rmi_firmware_build(FuFirmware *firmware, XbNode *n, GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  const gchar *product_id;

  guint64 tmp;

  /* either 0x or 10 */

  tmp = xb_node_query_text_as_uint(n, "kind", NULL);

  if (tmp != G_MAXUINT64)

    self->kind = tmp;

  /* any string */

  product_id = xb_node_query_text(n, "product_id", NULL);

  if (product_id != NULL) {

    gsize product_id_sz = strlen(product_id);

    if (product_id_sz > RMI_PRODUCT_ID_LENGTH) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_NOT_SUPPORTED,

            "product_id not supported, %u of %u bytes",

            (guint)product_id_sz,

            (guint)RMI_PRODUCT_ID_LENGTH);

      return FALSE;

    }

    g_free(self->product_id);

    self->product_id = g_strdup(product_id);

  }

  /* success */

  return TRUE;

}

static GByteArray *

fu_synaptics_rmi_firmware_write(FuFirmware *firmware, GError **error)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(firmware);

  /* two supported container formats */

  if (self->kind == RMI_FIRMWARE_KIND_0X)

    return fu_synaptics_rmi_firmware_write_v0x(firmware, error);

  if (self->kind == RMI_FIRMWARE_KIND_10)

    return fu_synaptics_rmi_firmware_write_v10(firmware, error);

  /* not supported */

  g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_NOT_SUPPORTED, "kind not supported");

  return NULL;

}

static void

fu_synaptics_rmi_firmware_init(FuSynapticsRmiFirmware *self)

{

  fu_firmware_add_flag(FU_FIRMWARE(self), FU_FIRMWARE_FLAG_HAS_CHECKSUM);

  fu_firmware_set_images_max(FU_FIRMWARE(self), RMI_IMG_MAX_CONTAINERS);

}

static void

fu_synaptics_rmi_firmware_finalize(GObject *obj)

{

  FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE(obj);

  g_free(self->product_id);

  G_OBJECT_CLASS(fu_synaptics_rmi_firmware_parent_class)->finalize(obj);

}

static void

fu_synaptics_rmi_firmware_class_init(FuSynapticsRmiFirmwareClass *klass)

{

  GObjectClass *object_class = G_OBJECT_CLASS(klass);

  FuFirmwareClass *firmware_class = FU_FIRMWARE_CLASS(klass);

  object_class->finalize = fu_synaptics_rmi_firmware_finalize;

  firmware_class->parse = fu_synaptics_rmi_firmware_parse;

  firmware_class->export = fu_synaptics_rmi_firmware_export;

  firmware_class->build = fu_synaptics_rmi_firmware_build;

  firmware_class->write = fu_synaptics_rmi_firmware_write;

}

FuFirmware *

fu_synaptics_rmi_firmware_new(void)

{

  return FU_FIRMWARE(g_object_new(FU_TYPE_SYNAPTICS_RMI_FIRMWARE, NULL));

}