mirrors/libfprint
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/libfprint/libfprint.git synced 2025-11-15 07:38:12 +00:00
Code Issues Packages Projects Releases Wiki Activity

egismoc: Convert value check values to big endian only when needed

Browse Source 
Since the driver seem to require a big-endian value it's just better
to use architecture native endianness to compute the check value and
eventually just convert to big endian as the chip wants.
This commit is contained in:
Marco Trevisan (Treviño)
2024-02-19 21:53:41 +01:00
parent 5462db9901
commit 3e5ab6fdad
1 changed files with 5 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
libfprint/drivers/egismoc/egismoc.c
View File

@@ -294,23 +294,21 @@ egismoc_get_check_bytes (const guchar *value,
fp_dbg ("Get check bytes");
EgisMocCheckBytes check_bytes;
const size_t steps = (value_length + 1) / 2;
guint16 big_endian_values[steps];
guint16 values[steps];
size_t sum_values = 0;
for (int i = 0, j = 0; i < value_length; i += 2, j++)
{
big_endian_values[j] = 0;
values[j] = (value[i] << 8 & 0xff00);
if (i < value_length - 1)
big_endian_values[j] = value[i + 1] << 8;
big_endian_values[j] |= (value[i] & 0x00ff);
values[j] |= value[i + 1] & 0x00ff;
}
for (int i = 0; i < steps; i++)
sum_values += big_endian_values[i];
sum_values += values[i];
check_bytes.check_value = GUINT16_TO_LE (0xffff - (sum_values % 0xffff));
check_bytes.check_value = GUINT16_TO_BE (0xffff - (sum_values % 0xffff));
return check_bytes;
}