# Re: git: how the pack-objects.c find the object's delta 1 messages from 2013-03-18 to 2013-03-18. Participants: Duy Nguyen. Thread: https://gitlist.dev/t/33211 ## Duy Nguyen, 2013-03-18 00:54 Subject: Re: git: how the pack-objects.c find the object's delta Message-ID: URL: https://gitlist.dev/e/CACsJy8C6pVTUYvU9xkNchfKBXNzT8nMuM%2BggD_FQXtGwNU59wA%40mail.gmail.com In-Reply-To: ``` Hi, I can't say from a first glance. Maybe git@vger can help? On Sun, Mar 17, 2013 at 10:08 PM, 方栋 wrote: > hello > > i don't understand this: > src in builtin/pack-objects.c find_deltas() function, line 1800: > > > static void find_deltas(struct object_entry **list, unsigned *list_size, > int window, int depth, unsigned *processed) > { > ...... > > /* > * Move the best delta base up in the window, after the > * currently deltified object, to keep it longer. It will > * be the first base object to be attempted next. > */ > if (entry->delta) { > struct unpacked swap = array[best_base]; > int dist = (window + idx - best_base) % window; > int dst = best_base; > while (dist--) { > int src = (dst + 1) % window; > array[dst] = array[src]; > dst = src; > } > array[dst] = swap; > } > ...... > } > > what this code block use for? > > thx > > > > > ------------------ > 祝好 > --方（tyut） > -- Duy ```