dfu-flasher-0.4.2 is not a library.
Dfu-flasher
A tool to flash ARM based CPU's such as stm32.
Examples
Read
Read from address 0x0800_0000 1024 bytes and save to a some_file.bin.
dfu-flasher --bus-device BUS:DEVICE read 0x8000_0000:1024 --file-name some_file.bin
Write
Write to flash address 0x0800_0000 1024 using some_file.bin as input.
dfu-flasher --bus-device BUS:DEVICE read 0x8000_0000:1024 --file-name some_file.bin