openusb_parse_data

Parameters

format A character string indicating the format that application requires. Character 'b' represents one byte, 'w' for word and 'd' for dword(4 bytes). Specially, character '.' indicates skipping one byte of source data.

data Little endian raw data that will be parsed.

datalen Length of data.

structure Address of the returned structure where the unpacked data will be stored

structlen Length of structure.

count Number of bytes parsed.

Description

openusb_parse_data() can parse little endian raw data and convert it to structured data. It's basically used to parse USB descriptors.

For exampe, to parse a descriptor such as:

    
    
    	struct test_descr {
    		uint8_t		a;
    		uint16_t	b;
    		uint8_t		c;
    		uint32_t	d;
    	};
    
        

The application would call:

    
        	rv = openusb_parse_data("bwbd", buffer, sizeof (buffer), (void *)&descr,
    		sizeof (descr), &count);
        

Return Value

OPENUSB_SUCCESS - Parse data successfully.

OPENUSB_PARSE_ERROR - Error happened during parsing.

OPENUSB_BADARG - Invalid argument. Format, data, structure or count is NULL pointer.

See Also