/*

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

 * Copyright 2019 Synaptics Inc

 *

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

 */

#include "config.h"

#include <string.h>

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

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

struct _FuSynapticsPrometheusFirmware {

  FuFirmware parent_instance;

  guint32 product_id;

  guint32 signature_size;

};

G_DEFINE_TYPE(FuSynapticsPrometheusFirmware, fu_synaptics_prometheus_firmware, FU_TYPE_FIRMWARE)

/* use only first 12 bit of 16 bits as tag value */

#define FU_SYNAPTICS_PROMETHEUS_FIRMWARE_TAG_MAX 0xfff0

#define FU_SYNAPTICS_PROMETHEUS_FIRMWARE_COUNT_MAX 64

guint32

fu_synaptics_prometheus_firmware_get_product_id(FuSynapticsPrometheusFirmware *self)

{

  g_return_val_if_fail(FU_IS_SYNAPTICS_PROMETHEUS_FIRMWARE(self), 0x0);

  return self->product_id;

}

gboolean

fu_synaptics_prometheus_firmware_set_signature_size(FuSynapticsPrometheusFirmware *self,

                guint32 signature_size)

{

  g_return_val_if_fail(FU_IS_SYNAPTICS_PROMETHEUS_FIRMWARE(self), FALSE);

  self->signature_size = signature_size;

  return TRUE;

}

static void

fu_synaptics_prometheus_firmware_export(FuFirmware *firmware,

          FuFirmwareExportFlags flags,

          XbBuilderNode *bn)

{

  FuSynapticsPrometheusFirmware *self = FU_SYNAPTICS_PROMETHEUS_FIRMWARE(firmware);

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

}

static gboolean

fu_synaptics_prometheus_firmware_parse(FuFirmware *firmware,

               FuInputStream *stream,

               FuFirmwareParseFlags flags,

               GError **error)

{

  FuSynapticsPrometheusFirmware *self = FU_SYNAPTICS_PROMETHEUS_FIRMWARE(firmware);

  gsize offset = 0;

  gsize streamsz = 0;

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

    return FALSE;

  if (streamsz < self->signature_size + FU_STRUCT_SYNAPTICS_PROMETHEUS_HDR_SIZE) {

    g_set_error_literal(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_DATA,

            "blob is too small to be firmware");

    return FALSE;

  }

  streamsz -= self->signature_size;

  /* parse each chunk */

  while (offset < streamsz) {

    guint32 hdrsz;

    guint32 tag;

    g_autoptr(FuFirmware) img = fu_firmware_new();

    g_autoptr(FuFirmware) img_old = NULL;

    g_autoptr(FuStructSynapticsPrometheusHdr) st_hdr = NULL;

    g_autoptr(FuInputStream) partial_stream = NULL;

    /* verify item header */

    st_hdr = fu_struct_synaptics_prometheus_hdr_parse_stream(stream, offset, error);

    if (st_hdr == NULL)

      return FALSE;

    tag = fu_struct_synaptics_prometheus_hdr_get_tag(st_hdr);

    if (tag >= FU_SYNAPTICS_PROMETHEUS_FIRMWARE_TAG_MAX) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_DATA,

            "tag 0x%04x is too large",

            tag);

      return FALSE;

    }

    /* sanity check */

    img_old = fu_firmware_get_image_by_idx(firmware, tag, NULL);

    if (img_old != NULL) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_DATA,

            "tag 0x%04x already present in image",

            tag);

      return FALSE;

    }

    hdrsz = fu_struct_synaptics_prometheus_hdr_get_bufsz(st_hdr);

    if (hdrsz == 0) {

      g_set_error(error,

            FWUPD_ERROR,

            FWUPD_ERROR_INVALID_DATA,

            "empty header for tag 0x%04x",

            tag);

      return FALSE;

    }

    if (!fu_size_checked_inc(&offset, st_hdr->buf->len, error)) {

      g_prefix_error(error, "overflow at tag 0x%04x: ", tag);

      return FALSE;

    }

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

    if (partial_stream == NULL)

      return FALSE;

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

      return FALSE;

    g_debug("adding 0x%04x (%s) with size 0x%04x",

      tag,

      fu_synaptics_prometheus_firmware_tag_to_string(tag),

      hdrsz);

    fu_firmware_set_idx(img, tag);

    fu_firmware_set_id(img, fu_synaptics_prometheus_firmware_tag_to_string(tag));

    if (!fu_firmware_add_image(firmware, img, error))

      return FALSE;

    /* metadata */

    if (tag == FU_SYNAPTICS_PROMETHEUS_FIRMWARE_TAG_MFW_UPDATE_HEADER) {

      g_autofree gchar *version = NULL;

      g_autoptr(FuStructSynapticsPrometheusMfwHdr) st_mfw = NULL;

      st_mfw = fu_struct_synaptics_prometheus_mfw_hdr_parse_stream(stream,

                         offset,

                         error);

      if (st_mfw == NULL)

        return FALSE;

      self->product_id =

          fu_struct_synaptics_prometheus_mfw_hdr_get_product(st_mfw);

      version = g_strdup_printf(

          "%u.%u",

          fu_struct_synaptics_prometheus_mfw_hdr_get_vmajor(st_mfw),

          fu_struct_synaptics_prometheus_mfw_hdr_get_vminor(st_mfw));

      fu_firmware_set_version(firmware, version);

    }

    /* next item */

    if (!fu_size_checked_inc(&offset, hdrsz, error))

      return FALSE;

  }

  return TRUE;

}

static GByteArray *

fu_synaptics_prometheus_firmware_write(FuFirmware *firmware, GError **error)

{

  FuSynapticsPrometheusFirmware *self = FU_SYNAPTICS_PROMETHEUS_FIRMWARE(firmware);

  g_autoptr(GByteArray) buf = g_byte_array_new();

  g_autoptr(FuStructSynapticsPrometheusHdr) st_hdr = fu_struct_synaptics_prometheus_hdr_new();

  g_autoptr(FuStructSynapticsPrometheusMfwHdr) st_mfw =

      fu_struct_synaptics_prometheus_mfw_hdr_new();

  g_autoptr(GBytes) payload = NULL;

  /* add header */

  fu_struct_synaptics_prometheus_hdr_set_tag(

      st_hdr,

      FU_SYNAPTICS_PROMETHEUS_FIRMWARE_TAG_MFW_UPDATE_HEADER);

  fu_struct_synaptics_prometheus_hdr_set_bufsz(st_hdr, st_mfw->buf->len);

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

  fu_struct_synaptics_prometheus_mfw_hdr_set_product(st_mfw, self->product_id);

  fu_byte_array_append_array(buf, st_mfw->buf);

  /* add payload */

  payload = fu_firmware_get_bytes_with_patches(firmware, error);

  if (payload == NULL)

    return NULL;

  fu_struct_synaptics_prometheus_hdr_set_tag(

      st_hdr,

      FU_SYNAPTICS_PROMETHEUS_FIRMWARE_TAG_MFW_UPDATE_PAYLOAD);

  fu_struct_synaptics_prometheus_hdr_set_bufsz(st_hdr, g_bytes_get_size(payload));

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

  fu_byte_array_append_bytes(buf, payload);

  /* add signature */

  for (guint i = 0; i < self->signature_size; i++)

    fu_byte_array_append_uint8(buf, 0xff);

  return g_steal_pointer(&buf);

}

static gboolean

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

{

  FuSynapticsPrometheusFirmware *self = FU_SYNAPTICS_PROMETHEUS_FIRMWARE(firmware);

  guint64 tmp;

  /* simple properties */

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

  if (tmp != G_MAXUINT64 && tmp <= G_MAXUINT32)

    self->product_id = tmp;

  /* success */

  return TRUE;

}

static void

fu_synaptics_prometheus_firmware_init(FuSynapticsPrometheusFirmware *self)

{

  fu_firmware_add_flag(FU_FIRMWARE(self), FU_FIRMWARE_FLAG_HAS_VID_PID);

  self->signature_size = FU_SYNAPTICS_PROMETHEUS_FIRMWARE_PROMETHEUS_SIGSIZE;

}

static void

fu_synaptics_prometheus_firmware_class_init(FuSynapticsPrometheusFirmwareClass *klass)

{

  FuFirmwareClass *firmware_class = FU_FIRMWARE_CLASS(klass);

  fu_firmware_add_image_gtype(firmware_class, FU_TYPE_FIRMWARE);

  firmware_class->parse = fu_synaptics_prometheus_firmware_parse;

  firmware_class->write = fu_synaptics_prometheus_firmware_write;

  firmware_class->export = fu_synaptics_prometheus_firmware_export;

  firmware_class->build = fu_synaptics_prometheus_firmware_build;

  fu_firmware_set_size_max(firmware_class, 16 * FU_MB);

  fu_firmware_set_images_max(firmware_class, FU_SYNAPTICS_PROMETHEUS_FIRMWARE_COUNT_MAX);

}

FuFirmware *

fu_synaptics_prometheus_firmware_new(void)

{

  return FU_FIRMWARE(g_object_new(FU_TYPE_SYNAPTICS_PROMETHEUS_FIRMWARE, NULL));

}