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Wrap libusb_device

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Introduce a structure to wrap a libusb_device and expose its descriptor
data read during discovery.

PR #2974 <https://github.com/Genymobile/scrcpy/pull/2974>
This commit is contained in:
Romain Vimont
2022-01-26 22:02:24 +01:00
parent 0ee9e2ff51
commit d8b37fe189
3 changed files with 59 additions and 18 deletions
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47
app/src/usb/usb.c
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@@ -30,7 +30,8 @@ read_string(libusb_device_handle *handle, uint8_t desc_index) {
}
static bool
accept_device(libusb_device *device, const char *serial) {
accept_device(libusb_device *device, const char *serial,
struct sc_usb_device *out) {
// Do not log any USB error in this function, it is expected that many USB
// devices available on the computer have permission restrictions
@@ -47,39 +48,61 @@ accept_device(libusb_device *device, const char *serial) {
}
char *device_serial = read_string(handle, desc.iSerialNumber);
libusb_close(handle);
if (!device_serial) {
libusb_close(handle);
return false;
}
bool matches = !strcmp(serial, device_serial);
free(device_serial);
return matches;
if (!matches) {
free(device_serial);
libusb_close(handle);
return false;
}
out->device = libusb_ref_device(device);
out->serial = device_serial;
out->vid = desc.idVendor;
out->pid = desc.idProduct;
out->manufacturer = read_string(handle, desc.iManufacturer);
out->product = read_string(handle, desc.iProduct);
libusb_close(handle);
return true;
}
libusb_device *
sc_usb_find_device(struct sc_usb *usb, const char *serial) {
void
sc_usb_device_destroy(struct sc_usb_device *usb_device) {
libusb_unref_device(usb_device->device);
free(usb_device->serial);
free(usb_device->manufacturer);
free(usb_device->product);
}
bool
sc_usb_find_device(struct sc_usb *usb, const char *serial,
struct sc_usb_device *out) {
assert(serial);
libusb_device **list;
libusb_device *result = NULL;
ssize_t count = libusb_get_device_list(usb->context, &list);
if (count < 0) {
log_libusb_error((enum libusb_error) count);
return NULL;
return false;
}
for (size_t i = 0; i < (size_t) count; ++i) {
libusb_device *device = list[i];
if (accept_device(device, serial)) {
result = libusb_ref_device(device);
break;
if (accept_device(device, serial, out)) {
libusb_free_device_list(list, 1);
return true;
}
}
libusb_free_device_list(list, 1);
return result;
return false;
}
static libusb_device_handle *