/*
 * Copyright (C) 2019 Richard Hughes <richard@hughsie.com>
 *
 * SPDX-License-Identifier: LGPL-2.1+
 */

#define G_LOG_DOMAIN				"FuFirmware"

#include "config.h"

#include "fu-common.h"
#include "fu-dfu-firmware.h"

/**
 * SECTION:fu-dfu-firmware
 * @short_description: DFU firmware image
 *
 * An object that represents a DFU firmware image.
 *
 * See also: #FuFirmware
 */

typedef struct {
	guint16			 vid;
	guint16			 pid;
	guint16			 release;
	guint16			 version;
} FuDfuFirmwarePrivate;

G_DEFINE_TYPE_WITH_PRIVATE (FuDfuFirmware, fu_dfu_firmware, FU_TYPE_FIRMWARE)
#define GET_PRIVATE(o) (fu_dfu_firmware_get_instance_private (o))

static void
fu_dfu_firmware_to_string (FuFirmware *firmware, guint idt, GString *str)
{
	FuDfuFirmware *self = FU_DFU_FIRMWARE (firmware);
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	fu_common_string_append_kx (str, idt, "Vid", priv->vid);
	fu_common_string_append_kx (str, idt, "Pid", priv->pid);
	fu_common_string_append_kx (str, idt, "Release", priv->release);
	fu_common_string_append_kx (str, idt, "Version", priv->version);
}

/**
 * fu_dfu_firmware_get_vid:
 * @self: a #FuDfuFirmware
 *
 * Gets the vendor ID, or 0xffff for no restriction.
 *
 * Return value: integer
 *
 * Since: 1.3.3
 **/
guint16
fu_dfu_firmware_get_vid (FuDfuFirmware *self)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_val_if_fail (FU_IS_DFU_FIRMWARE (self), 0x0);
	return priv->vid;
}

/**
 * fu_dfu_firmware_get_pid:
 * @self: a #FuDfuFirmware
 *
 * Gets the product ID, or 0xffff for no restriction.
 *
 * Return value: integer
 *
 * Since: 1.3.3
 **/
guint16
fu_dfu_firmware_get_pid (FuDfuFirmware *self)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_val_if_fail (FU_IS_DFU_FIRMWARE (self), 0x0);
	return priv->pid;
}

/**
 * fu_dfu_firmware_get_release:
 * @self: a #FuDfuFirmware
 *
 * Gets the device ID, or 0xffff for no restriction.
 *
 * Return value: integer
 *
 * Since: 1.3.3
 **/
guint16
fu_dfu_firmware_get_release (FuDfuFirmware *self)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_val_if_fail (FU_IS_DFU_FIRMWARE (self), 0x0);
	return priv->release;
}

/**
 * fu_dfu_firmware_get_version:
 * @self: a #FuDfuFirmware
 *
 * Gets the file format version with is 0x0100 by default.
 *
 * Return value: integer
 *
 * Since: 1.3.3
 **/
guint16
fu_dfu_firmware_get_version (FuDfuFirmware *self)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_val_if_fail (FU_IS_DFU_FIRMWARE (self), 0x0);
	return priv->version;
}

/**
 * fu_dfu_firmware_set_vid:
 * @self: a #FuDfuFirmware
 * @vid: vendor ID, or 0xffff if the firmware should match any vendor
 *
 * Sets the vendor ID.
 *
 * Since: 1.3.3
 **/
void
fu_dfu_firmware_set_vid (FuDfuFirmware *self, guint16 vid)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_if_fail (FU_IS_DFU_FIRMWARE (self));
	priv->vid = vid;
}

/**
 * fu_dfu_firmware_set_pid:
 * @self: a #FuDfuFirmware
 * @pid: product ID, or 0xffff if the firmware should match any product
 *
 * Sets the product ID.
 *
 * Since: 1.3.3
 **/
void
fu_dfu_firmware_set_pid (FuDfuFirmware *self, guint16 pid)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_if_fail (FU_IS_DFU_FIRMWARE (self));
	priv->pid = pid;
}

/**
 * fu_dfu_firmware_set_release:
 * @self: a #FuDfuFirmware
 * @release: release, or 0xffff if the firmware should match any release
 *
 * Sets the release for the dfu firmware.
 *
 * Since: 1.3.3
 **/
void
fu_dfu_firmware_set_release (FuDfuFirmware *self, guint16 release)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_if_fail (FU_IS_DFU_FIRMWARE (self));
	priv->release = release;
}

/**
 * fu_dfu_firmware_set_version:
 * @self: a #FuDfuFirmware
 * @version: integer
 *
 * Sets the file format version.
 *
 * Since: 1.3.3
 **/
void
fu_dfu_firmware_set_version (FuDfuFirmware *self, guint16 version)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	g_return_if_fail (FU_IS_DFU_FIRMWARE (self));
	priv->version = version;
}

static guint32 _crctbl[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d };

static guint32
fu_dfu_firmware_generate_crc32 (const guint8 *data, gsize length)
{
	guint32 accum = 0xffffffff;
	for (guint i = 0; i < length; i++)
		accum = _crctbl[(accum^data[i]) & 0xff] ^ (accum >> 8);
	return accum;
}

typedef struct __attribute__((packed)) {
	guint16		release;
	guint16		pid;
	guint16		vid;
	guint16		ver;
	guint8		sig[3];
	guint8		len;
	guint32		crc;
} FuDfuFirmwareFooter;

static gboolean
fu_dfu_firmware_parse (FuFirmware *firmware,
		       GBytes *fw,
		       guint64 addr_start,
		       guint64 addr_end,
		       FwupdInstallFlags flags,
		       GError **error)
{
	FuDfuFirmware *self = FU_DFU_FIRMWARE (firmware);
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	FuDfuFirmwareFooter ftr;
	gsize len;
	guint32 crc;
	guint32 crc_new;
	guint8 *data;
	g_autoptr(FuFirmwareImage) image = NULL;
	g_autoptr(GBytes) contents = NULL;

	/* check data size */
	data = (guint8 *) g_bytes_get_data (fw, &len);
	if (len < sizeof(FuDfuFirmwareFooter)) {
		g_set_error_literal (error,
				     FWUPD_ERROR,
				     FWUPD_ERROR_INTERNAL,
				     "size check failed, too small");
		return FALSE;
	}

	/* check for DFU signature */
	if (memcmp (&data[len - G_STRUCT_OFFSET (FuDfuFirmwareFooter, sig)],
		    "UFD", sizeof(ftr.sig)) != 0) {
		g_set_error_literal (error,
				     FWUPD_ERROR,
				     FWUPD_ERROR_INTERNAL,
				     "no DFU signature");
		return FALSE;
	}

	/* verify the checksum */
	if (!fu_memcpy_safe ((guint8 *) &ftr, sizeof(FuDfuFirmwareFooter), 0x0,	/* dst */
			     data, len, len - sizeof(FuDfuFirmwareFooter),	/* src */
			     sizeof(FuDfuFirmwareFooter), error))
		return FALSE;
	crc = GUINT32_FROM_LE(ftr.crc);
	if ((flags & FWUPD_INSTALL_FLAG_FORCE) == 0) {
		crc_new = fu_dfu_firmware_generate_crc32 (data, len - 4);
		if (crc != crc_new) {
			g_set_error (error,
				     FWUPD_ERROR,
				     FWUPD_ERROR_INTERNAL,
				     "CRC failed, expected %04x, got %04x",
				     crc_new, GUINT32_FROM_LE(ftr.crc));
			return FALSE;
		}
	}

	/* set from footer */
	priv->vid = GUINT16_FROM_LE(ftr.vid);
	priv->pid = GUINT16_FROM_LE(ftr.pid);
	priv->release = GUINT16_FROM_LE(ftr.release);
	priv->version = GUINT16_FROM_LE(ftr.ver);

	/* check reported length */
	if (ftr.len > len) {
		g_set_error (error,
			     FWUPD_ERROR,
			     FWUPD_ERROR_INTERNAL,
			     "reported firmware size %04x larger than file %04x",
			     (guint) ftr.len, (guint) len);
		return FALSE;
	}

	/* success */
	contents = g_bytes_new_from_bytes (fw, 0, len - ftr.len);
	image = fu_firmware_image_new (contents);
	fu_firmware_add_image (firmware, image);
	return TRUE;
}

static GBytes *
fu_dfu_firmware_add_footer (FuDfuFirmware *self, GBytes *contents, GError **error)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	GByteArray *buf = g_byte_array_new ();
	const guint8 *blob;
	gsize blobsz = 0;

	/* add the raw firmware data */
	blob = g_bytes_get_data (contents, &blobsz);
	g_byte_array_append (buf, blob, blobsz);

	/* append footer */
	fu_byte_array_append_uint16 (buf, priv->release, G_LITTLE_ENDIAN);
	fu_byte_array_append_uint16 (buf, priv->pid, G_LITTLE_ENDIAN);
	fu_byte_array_append_uint16 (buf, priv->vid, G_LITTLE_ENDIAN);
	fu_byte_array_append_uint16 (buf, priv->version, G_LITTLE_ENDIAN);
	g_byte_array_append (buf, (const guint8 *) "UFD", 3);
	fu_byte_array_append_uint8 (buf, sizeof(FuDfuFirmwareFooter));
	fu_byte_array_append_uint32 (buf,
				     fu_dfu_firmware_generate_crc32 (buf->data, buf->len),
				     G_LITTLE_ENDIAN);
	return g_byte_array_free_to_bytes (buf);
}

static GBytes *
fu_dfu_firmware_write (FuFirmware *firmware, GError **error)
{
	FuDfuFirmware *self = FU_DFU_FIRMWARE (firmware);
	g_autoptr(GPtrArray) images = fu_firmware_get_images (firmware);
	g_autoptr(GBytes) fw = NULL;

	/* can only contain one image */
	if (images->len > 1) {
		g_set_error (error,
			     FWUPD_ERROR,
			     FWUPD_ERROR_NOT_SUPPORTED,
			     "DFU only supports writing one image");
		return NULL;
	}

	/* add footer */
	fw = fu_firmware_get_image_default_bytes (firmware, error);
	if (fw == NULL)
		return NULL;
	return fu_dfu_firmware_add_footer (self, fw, error);
}

static void
fu_dfu_firmware_init (FuDfuFirmware *self)
{
	FuDfuFirmwarePrivate *priv = GET_PRIVATE (self);
	priv->vid = 0xffff;
	priv->pid = 0xffff;
	priv->release = 0xffff;
	priv->version = 0x0100;
}

static void
fu_dfu_firmware_class_init (FuDfuFirmwareClass *klass)
{
	FuFirmwareClass *klass_firmware = FU_FIRMWARE_CLASS (klass);
	klass_firmware->to_string = fu_dfu_firmware_to_string;
	klass_firmware->parse = fu_dfu_firmware_parse;
	klass_firmware->write = fu_dfu_firmware_write;
}

/**
 * fu_dfu_firmware_new:
 *
 * Creates a new #FuFirmware of sub type Dfu
 *
 * Since: 1.3.3
 **/
FuFirmware *
fu_dfu_firmware_new (void)
{
	return FU_FIRMWARE (g_object_new (FU_TYPE_DFU_FIRMWARE, NULL));
}