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http: use off_t to store partial file size

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When we try to resume transfer of a partially-downloaded
object or pack, we fopen() the existing file for append,
then use ftell() to get the current position. We use a
"long", which can hold only 2GB on a 32-bit system, even
though packfiles may be larger than that.

Let's switch to using off_t, which should hold any file size
our system is capable of storing. We need to use ftello() to
get the off_t. This is in POSIX and hopefully available
everywhere; if not, we should be able to wrap it by falling
back to ftell(), which would presumably return "-1" on such
a large file (and we would simply skip resuming in that case).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2015-11-02 17:10:27 -05:00 committed by Junio C Hamano
parent 835c4d3689
commit f8117f550b
1 changed files with 4 additions and 4 deletions
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8
http.c
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@ -1205,7 +1205,7 @@ static int http_request(const char *url,
curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
if (target == HTTP_REQUEST_FILE) {
long posn = ftell(result);
off_t posn = ftello(result);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
fwrite);
if (posn > 0)
@ -1581,7 +1581,7 @@ int finish_http_pack_request(struct http_pack_request *preq)
struct http_pack_request *new_http_pack_request(
struct packed_git *target, const char *base_url)
{
long prev_posn = 0;
off_t prev_posn = 0;
struct strbuf buf = STRBUF_INIT;
struct http_pack_request *preq;
@ -1613,7 +1613,7 @@ struct http_pack_request *new_http_pack_request(
* If there is data present from a previous transfer attempt,
* resume where it left off
*/
prev_posn = ftell(preq->packfile);
prev_posn = ftello(preq->packfile);
if (prev_posn>0) {
if (http_is_verbose)
fprintf(stderr,
@ -1668,7 +1668,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
int prevlocal;
char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
off_t prev_posn = 0;
struct http_object_request *freq;
freq = xcalloc(1, sizeof(*freq));