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torrent: calculate piece length depending on file size

--- a/sys/src/cmd/ip/torrent.c

+++ b/sys/src/cmd/ip/torrent.c

@@ -764,8 +764,12 @@

 		werrstr("empty file");

 		return -1;

 	}

-	blocksize = 1024*1024;

-	npieces = (d->length + blocksize-1) / blocksize;

+	npieces = 1;

+	for(blocksize = 256*1024;;blocksize<<=1){

+		npieces = (d->length + blocksize-1) / blocksize;

+		if(npieces <= 8*1024 || blocksize >= 2*1024*1024)

+			break;

+	}

 	print("d");

 	print("8:announce%ld:%s", strlen(url), url);

 	print("4:info");