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MFC r208012

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Support getting signed and unsigned HID data.
This commit is contained in:
Andrew Thompson 2010-05-17 23:57:34 +00:00
parent 300902e282
commit 1eeca0bf19
1 changed files with 10 additions and 6 deletions
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16
lib/libusbhid/data.c
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@ -53,13 +53,17 @@ hid_get_data(const void *p, const hid_item_t *h)
data = 0;
for (i = 0; i <= end; i++)
data |= buf[offs + i] << (i*8);
/* Correctly shift down data */
data >>= hpos % 8;
data &= (1 << hsize) - 1;
if (h->logical_minimum < 0) {
/* Need to sign extend */
hsize = sizeof data * 8 - hsize;
data = (data << hsize) >> hsize;
}
hsize = 32 - hsize;
/* Mask and sign extend in one */
if ((h->logical_minimum < 0) || (h->logical_maximum < 0))
data = (int32_t)((int32_t)data << hsize) >> hsize;
else
data = (uint32_t)((uint32_t)data << hsize) >> hsize;
return (data);
}