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wacom-usb: Add support for writing firmware

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This commit is contained in:
Richard Hughes 2021-03-11 10:10:51 +00:00
parent e574a942c8
commit 42dcff32ca
3 changed files with 77 additions and 9 deletions
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54
plugins/wacom-usb/fu-wac-firmware.c
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@ -253,6 +253,59 @@ fu_wac_firmware_parse (FuFirmware *firmware,
return TRUE;
}
static guint8
fu_wac_firmware_calc_checksum (GByteArray *buf)
{
guint8 csum = 0;
for (guint i = 0; i < buf->len; i++)
csum += buf->data[i];
return csum ^ 0xFF;
}
static GBytes *
fu_wac_firmware_write (FuFirmware *firmware, GError **error)
{
g_autoptr(GPtrArray) images = fu_firmware_get_images (firmware);
g_autoptr(GString) str = g_string_new (NULL);
g_autoptr(GByteArray) buf_hdr = g_byte_array_new ();
/* fw header */
for (guint i = 0; i < images->len; i++) {
FuFirmware *img = g_ptr_array_index (images, i);
fu_byte_array_append_uint32 (buf_hdr, fu_firmware_get_addr (img), G_BIG_ENDIAN);
fu_byte_array_append_uint32 (buf_hdr, fu_firmware_get_size (img), G_BIG_ENDIAN);
}
g_string_append_printf (str, "WACOM%u", images->len);
for (guint i = 0; i < buf_hdr->len; i++)
g_string_append_printf (str, "%02X", buf_hdr->data[i]);
g_string_append_printf (str, "%02X\n", fu_wac_firmware_calc_checksum (buf_hdr));
/* payload */
for (guint i = 0; i < images->len; i++) {
FuFirmware *img = g_ptr_array_index (images, i);
g_autoptr(GBytes) img_blob = NULL;
g_autoptr(GByteArray) buf_img = g_byte_array_new ();
/* img header */
g_string_append_printf (str, "WA%u", (guint) fu_firmware_get_idx (img) + 1);
fu_byte_array_append_uint32 (buf_img, fu_firmware_get_addr (img), G_BIG_ENDIAN);
for (guint j = 0; j < buf_img->len; j++)
g_string_append_printf (str, "%02X", buf_img->data[j]);
g_string_append_printf (str, "%02X\n", fu_wac_firmware_calc_checksum (buf_img));
/* srec */
img_blob = fu_firmware_write (img, error);
if (img_blob == NULL)
return NULL;
g_string_append_len (str,
(const gchar *) g_bytes_get_data (img_blob, NULL),
g_bytes_get_size (img_blob));
}
/* success */
return g_string_free_to_bytes (g_steal_pointer (&str));
}
static void
fu_wac_firmware_init (FuWacFirmware *self)
{
@ -263,6 +316,7 @@ fu_wac_firmware_class_init (FuWacFirmwareClass *klass)
{
FuFirmwareClass *klass_firmware = FU_FIRMWARE_CLASS (klass);
klass_firmware->parse = fu_wac_firmware_parse;
klass_firmware->write = fu_wac_firmware_write;
}
FuFirmware *

20
src/fuzzing/firmware/wacom.wac
View File

@ -1,9 +1,11 @@
WACOM2080080000009414E080400000009414A3F
WA10800800067
S00B00004F616B2E73726563FE
S70508038BD58F
WA2080400001F
S00B00004F616B2E73726563FE
S70508070BD50B
WACOM2080080000000000B080400000000000B55
WA10800800077
S0030000FC
S3100800800068656C6C6F20776F726C640B
S604000001FA
S70500000000FA
WA208040000F3
S0030000FC
S3100804000068656C6C6F20776F726C6487
S604000001FA
S70500000000FA

12
src/fuzzing/wacom.builder.xml Normal file
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@ -0,0 +1,12 @@
<firmware gtype="FuWacFirmware">
<firmware gtype="FuSrecFirmware">
<idx>0x0</idx>
<addr>0x8008000</addr>
<data>aGVsbG8gd29ybGQ=</data>
</firmware>
<firmware gtype="FuSrecFirmware">
<idx>0x1</idx>
<addr>0x8040000</addr>
<data>aGVsbG8gd29ybGQ=</data>
</firmware>
</firmware>