tree 2dfbbf084da4772beaeeba399de8f1252c2641ed
parent 9c0baf82049efd95230a8389769e1b3e5d001209
author Andrew de los Reyes <adlr@chromium.org> 1286507238 -0700
committer Andrew de los Reyes <adlr@chromium.org> 1286507238 -0700

AU: MultiHttpFetcher, an HttpFetcher for specific byte ranges

MultiHttpFetcher takes an HttpFetcher class via template parameter,
and a collection of byte ranges. It hits up the URL multiple times,
once per range specified. For each time, it uses a new HttpFetcher of
the type specified and fast-forwards to the offset requested, and
aborting after enough bytes have been downloaded. Any range many
specify a length of -1, which means until the end of the file (as
dictated by the server). Thus, a single range of [0, -1] makes
MultiHttpFetcher a pass-through.

HttpFetcher change: ability to supply an offset.

LibcurlHttpFetcher changes: offset support (from HttpFetcher API),
ability to be terminted in a write-callback.

test_http_fetcher: support for failures in write() on the socket (at
least in the /big url case).

BUG=7391
TEST=unittests

Review URL: http://codereview.chromium.org/3591018