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/*
* Copyright (c) 2019 Google LLC. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
*/
#include <hidapi/hidapi.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "fido.h"
static size_t
fido_wcslen(const wchar_t *wcs)
{
size_t l = 0;
while (*wcs++ != L'\0')
l++;
return l;
}
static char *
wcs_to_cs(const wchar_t *wcs)
{
char *cs;
size_t i;
if (wcs == NULL || (cs = calloc(fido_wcslen(wcs) + 1, 1)) == NULL)
return NULL;
for (i = 0; i < fido_wcslen(wcs); i++) {
if (wcs[i] >= 128) {
/* give up on parsing non-ASCII text */
free(cs);
return strdup("hidapi device");
}
cs[i] = (char)wcs[i];
}
return cs;
}
static int
copy_info(fido_dev_info_t *di, const struct hid_device_info *d)
{
memset(di, 0, sizeof(*di));
if (d->path != NULL)
di->path = strdup(d->path);
else
di->path = strdup("");
if (d->manufacturer_string != NULL)
di->manufacturer = wcs_to_cs(d->manufacturer_string);
else
di->manufacturer = strdup("");
if (d->product_string != NULL)
di->product = wcs_to_cs(d->product_string);
else
di->product = strdup("");
if (di->path == NULL ||
di->manufacturer == NULL ||
di->product == NULL) {
free(di->path);
free(di->manufacturer);
free(di->product);
return -1;
}
di->product_id = d->product_id;
di->vendor_id = d->vendor_id;
di->io = (fido_dev_io_t) {
&fido_hid_open,
&fido_hid_close,
&fido_hid_read,
&fido_hid_write,
};
return 0;
}
void *
fido_hid_open(const char *path)
{
return hid_open_path(path);
}
void
fido_hid_close(void *hid_dev_handle)
{
hid_close(hid_dev_handle);
}
int
fido_hid_read(void *hid_dev_handle, unsigned char *buf, size_t len, int ms)
{
return hid_read_timeout(hid_dev_handle, buf, len, ms);
}
int
fido_hid_write(void *hid_dev_handle, const unsigned char *buf, size_t len)
{
return hid_write(hid_dev_handle, buf, len);
}
int
fido_hid_manifest(fido_dev_info_t *devlist, size_t ilen, size_t *olen)
{
struct hid_device_info *hdi;
*olen = 0;
if (ilen == 0)
return FIDO_OK; /* nothing to do */
if (devlist == NULL)
return FIDO_ERR_INVALID_ARGUMENT;
if ((hdi = hid_enumerate(0, 0)) == NULL)
return FIDO_OK; /* nothing to do */
for (struct hid_device_info *d = hdi; d != NULL; d = d->next) {
#if defined(_WIN32) || defined(__APPLE__)
if (d->usage_page != 0xf1d0)
continue;
#endif
if (copy_info(&devlist[*olen], d) == 0) {
if (++(*olen) == ilen)
break;
}
}
hid_free_enumeration(hdi);
return FIDO_OK;
}
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