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hid: Shift usage values to LSB. 

Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Aric Stewart <aric@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
stable
Andrew Eikum 2019-05-06 08:46:42 -05:00 committed by Alexandre Julliard
parent ec7bdf6154
commit daa9906cce
1 changed files with 14 additions and 19 deletions
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33
dlls/hid/hidp.c
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@ -49,32 +49,27 @@ static NTSTATUS get_report_data(BYTE *report, INT reportLength, INT startBit, IN
ULONG byte_index = startBit / 8;
ULONG bit_index = startBit - (byte_index * 8);
INT mask = (1 << bit_index);
*value = (report[byte_index] & mask);
*value = !!(report[byte_index] & mask);
}
else
{
ULONG remaining_bits = valueSize;
ULONG byte_index = startBit / 8;
ULONG bit_index = startBit % 8;
ULONG data = 0;
ULONG remainingBits = valueSize;
ULONG shift = 0;
ULONG begin_offset = startBit % 8;
while (remainingBits)
while (remaining_bits)
{
if (remainingBits >= 8)
{
BYTE mask = 0xff << begin_offset;
data |= (report[byte_index] & mask) << shift;
byte_index ++;
remainingBits -= (8-begin_offset);
shift += (8-begin_offset);
begin_offset = 0;
}
else if (remainingBits > 0)
{
BYTE mask = (0xff >> (8-remainingBits)) << begin_offset;
data |= (report[byte_index] & mask) << shift;
remainingBits = 0;
}
ULONG copy_bits = 8 - bit_index;
if (remaining_bits < copy_bits)
copy_bits = remaining_bits;
data |= ((report[byte_index] >> bit_index) & ((2 << copy_bits) - 1)) << shift;
shift += copy_bits;
bit_index = 0;
byte_index++;
remaining_bits -= copy_bits;
}
*value = data;
}