tree 5451c867ef898d36760d56a1a8f2d48822ceea5a
parent c58b24651a56989fdf39b42202c77e72749e8bab
author Jerry Zhang <zhangjerry@google.com> 1497555733 -0700
committer Jerry Zhang <zhangjerry@google.com> 1497562803 -0700

Fix 4G file transfer on 32 bit.

ptp_usb_senddata will store file size in a uint64_t,
but ptp_write_func casts this down to an unsigned long,
which is 32 bits on i386.

To fix, break up transfers into pieces less than
ULONG_MAX rounded down by packet size.