Squid internals

The Storage Manager (src/store*.c)
Store Clients - typical flow

sc = storeClientListAdd(e, mydata);
    /* become a store client */

..

storeClientCopy(sc, e, seen_offset, copy_offset, size, buf, callback, mydata)
    /* request a part of an object:
     * sc = store client, obtained from above
     * e = store entry, same as above
     * seen_offset = what we've seen already (generally for header parsing)
     * copy_offset = what we would like
     * size = how big a buffer we have
     * buf = buffer to copy data into
     * callback = callback to call when the data is avaliable (or not!)
     * mydata = data for callback, same as above
     */

..

storeUnregister(sc, e, mydata);
    /* Detach from StoreEntry */