Add missing LibUSB 1.0 API function: libusb_get_string_descriptor().

Reported by:	Xiaofan Chen

4 files changed, 28 insertions, 1 deletions

diff --git a/lib/libusb/Makefile b/lib/libusb/Makefile
index 75efe2e..7a9bd1b 100644
--- a/lib/libusb/Makefile
+++ b/lib/libusb/Makefile
@@ -74,6 +74,7 @@ MLINKS += libusb.3 libusb_get_active_config_descriptor.3
 MLINKS += libusb.3 libusb_get_config_descriptor.3
 MLINKS += libusb.3 libusb_get_config_descriptor_by_value.3
 MLINKS += libusb.3 libusb_free_config_descriptor.3
+MLINKS += libusb.3 libusb_get_string_descriptor.3
 MLINKS += libusb.3 libusb_get_string_descriptor_ascii.3
 MLINKS += libusb.3 libusb_parse_ss_endpoint_comp.3
 MLINKS += libusb.3 libusb_free_ss_endpoint_comp.3
diff --git a/lib/libusb/libusb.3 b/lib/libusb/libusb.3
index 6b1defd..1ab0a8b 100644
--- a/lib/libusb/libusb.3
+++ b/lib/libusb/libusb.3
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 12, 2012
+.Dd May 7, 2012
 .Dt LIBUSB 3
 .Os
 .Sh NAME
@@ -314,6 +314,12 @@ LIBUSB_ERROR code on failure.
 Free a configuration descriptor.
 .Pp
 .Ft int
+.Fn libusb_get_string_descriptor "libusb_device_handle *devh" "uint8_t desc_idx" "uint16_t langid" "unsigned char *data" "int length"
+Retrieve a string descriptor in raw format.
+Returns the number of bytes actually transferred on success
+or a negative LIBUSB_ERROR code on failure.
+.Pp
+.Ft int
 .Fn libusb_get_string_descriptor_ascii "libusb_device_handle *devh" "uint8_t desc_idx" "unsigned char *data" "int length"
 Retrieve a string descriptor in C style ASCII.
 Returns the positive number of bytes in the resulting ASCII string
diff --git a/lib/libusb/libusb.h b/lib/libusb/libusb.h
index d8a22b5..1675f46 100644
--- a/lib/libusb/libusb.h
+++ b/lib/libusb/libusb.h
@@ -398,6 +398,7 @@ int	libusb_get_active_config_descriptor(libusb_device * dev, struct libusb_confi
 int	libusb_get_config_descriptor(libusb_device * dev, uint8_t config_index, struct libusb_config_descriptor **config);
 int	libusb_get_config_descriptor_by_value(libusb_device * dev, uint8_t bConfigurationValue, struct libusb_config_descriptor **config);
 void	libusb_free_config_descriptor(struct libusb_config_descriptor *config);
+int	libusb_get_string_descriptor(libusb_device_handle * devh, uint8_t desc_index, uint16_t langid, unsigned char *data, int length);
 int	libusb_get_string_descriptor_ascii(libusb_device_handle * devh, uint8_t desc_index, uint8_t *data, int length);
 int	libusb_get_descriptor(libusb_device_handle * devh, uint8_t desc_type, uint8_t desc_index, uint8_t *data, int length);
 int	libusb_parse_ss_endpoint_comp(const void *buf, int len, struct libusb_ss_endpoint_companion_descriptor **ep_comp);
diff --git a/lib/libusb/libusb10_desc.c b/lib/libusb/libusb10_desc.c
index 8e39bab..11e201f 100644
--- a/lib/libusb/libusb10_desc.c
+++ b/lib/libusb/libusb10_desc.c
@@ -294,6 +294,25 @@ libusb_free_config_descriptor(struct libusb_config_descriptor *config)
 }
 
 int
+libusb_get_string_descriptor(libusb_device_handle *pdev,
+    uint8_t desc_index, uint16_t langid, unsigned char *data,
+    int length)
+{
+	if (pdev == NULL || data == NULL || length < 1)
+		return (LIBUSB_ERROR_INVALID_PARAM);
+
+	if (length > 65535)
+		length = 65535;
+
+	/* put some default data into the destination buffer */
+	data[0] = 0;
+
+	return (libusb_control_transfer(pdev, LIBUSB_ENDPOINT_IN,
+	    LIBUSB_REQUEST_GET_DESCRIPTOR, (LIBUSB_DT_STRING << 8) | desc_index,
+	    langid, data, length, 1000));
+}
+
+int
 libusb_get_string_descriptor_ascii(libusb_device_handle *pdev,
     uint8_t desc_index, unsigned char *data, int length)
 {