Merge pull request #209 from MerchGuardian/libusb_init_context

Add libusb_init_context and associated structs

libusb1-sys/src/lib.rs

@@ -204,6 +204,83 @@ pub struct libusb_pollfd {
     pub events: c_short,
 }
 
+#[repr(C)]
+pub union libusb_init_option__value {
+    pub ival: c_int,
+    pub log_cbval: libusb_log_cb,
+}
+
+#[repr(C)]
+pub enum libusb_option {
+    /// Set the log message verbosity.
+    ///
+    /// This option must be provided an argument of type \ref libusb_log_level.
+    /// The default level is LIBUSB_LOG_LEVEL_NONE, which means no messages are ever
+    /// printed. If you choose to increase the message verbosity level, ensure
+    /// that your application does not close the stderr file descriptor.
+    ///
+    /// You are advised to use level LIBUSB_LOG_LEVEL_WARNING. libusb is conservative
+    /// with its message logging and most of the time, will only log messages that
+    /// explain error conditions and other oddities. This will help you debug
+    /// your software.
+    ///
+    /// If the LIBUSB_DEBUG environment variable was set when libusb was
+    /// initialized, this option does nothing: the message verbosity is fixed
+    /// to the value in the environment variable.
+    ///
+    /// If libusb was compiled without any message logging, this option does
+    /// nothing: you'll never get any messages.
+    ///
+    /// If libusb was compiled with verbose debug message logging, this option
+    /// does nothing: you'll always get messages from all levels.
+    LIBUSB_OPTION_LOG_LEVEL = 0,
+
+    /// Use the UsbDk backend for a specific context, if available.
+    ///
+    /// This option should be set at initialization with libusb_init_context()
+    /// otherwise unspecified behavior may occur.
+    ///
+    /// Only valid on Windows. Ignored on all other platforms.
+    LIBUSB_OPTION_USE_USBDK = 1,
+
+    /// Do not scan for devices. LIBUSB_OPTION_WEAK_AUTHORITY is aliased to this
+    ///
+    /// With this option set, libusb will skip scanning devices in
+    /// libusb_init_context().
+    ///
+    /// Hotplug functionality will also be deactivated.
+    ///
+    /// The option is useful in combination with libusb_wrap_sys_device(),
+    /// which can access a device directly without prior device scanning.
+    ///
+    /// This is typically needed on Android, where access to USB devices
+    /// is limited.
+    ///
+    /// This option should only be used with libusb_init_context()
+    /// otherwise unspecified behavior may occur.
+    ///
+    /// Only valid on Linux. Ignored on all other platforms.
+    LIBUSB_OPTION_NO_DEVICE_DISCOVERY = 2,
+
+    /// Set the context log callback function.
+    ///
+    /// Set the log callback function either on a context or globally. This
+    /// option must be provided an argument of type \ref libusb_log_cb.
+    /// Using this option with a NULL context is equivalent to calling
+    /// libusb_set_log_cb() with mode \ref LIBUSB_LOG_CB_GLOBAL.
+    /// Using it with a non-NULL context is equivalent to calling
+    /// libusb_set_log_cb() with mode \ref LIBUSB_LOG_CB_CONTEXT.
+    LIBUSB_OPTION_LOG_CB = 3,
+
+    LIBUSB_OPTION_MAX = 4,
+}
+
+#[repr(C)]
+pub struct libusb_init_option {
+    pub option: libusb_option,
+    pub value: libusb_init_option__value,
+}
+
 pub type libusb_hotplug_callback_handle = c_int;
 pub type libusb_hotplug_flag = c_int;
 pub type libusb_hotplug_event = c_int;
@@ -230,6 +307,11 @@ extern "system" {
     pub fn libusb_strerror(errcode: c_int) -> *const c_char;
 
     pub fn libusb_init(context: *mut *mut libusb_context) -> c_int;
+    pub fn libusb_init_context(
+        context: *mut *mut libusb_context,
+        options: *mut libusb_init_option,
+        num_options: c_int,
+    ) -> c_int;
     pub fn libusb_exit(context: *mut libusb_context);
     pub fn libusb_set_debug(context: *mut libusb_context, level: c_int);
     pub fn libusb_set_log_cb(context: *mut libusb_context, cb: Option<libusb_log_cb>, mode: c_int);