How did pirates deal with Gulliver and his crew?

From the text:

My men were sent by an equal division into both the pirate ships, and my sloop new manned. As to myself, it was determined that I should be set adrift in a small canoe, with paddles and a sail, and four days’ provisions; which last, the Japanese captain was so kind to double out of his own stores, and would permit no man to search me.