/*
* Move the file pointer ahead by an arbitrary amount. If you're
* reading uncompressed data from a disk file, this will actually
* translate into a seek() operation. Even in cases where seek()
* isn't feasible, this at least pushes the read-and-discard loop
* down closer to the data source.
*/
int64_t
__archive_read_skip(struct archive_read *a, int64_t request)
{
int64_t skipped = __archive_read_skip_lenient(a, request);
if (skipped == request)
return (skipped);
/* We hit EOF before we satisfied the skip request. */
if (skipped < 0) // Map error code to 0 for error message below.
skipped = 0;
archive_set_error(&a->archive,
ARCHIVE_ERRNO_MISC,
"Truncated input file (needed %jd bytes, only %jd available)",
(intmax_t)request, (intmax_t)skipped);
return (ARCHIVE_FATAL);
}
static int
tk_archive_read_format_raw_read_data_skip(struct archive_read *a)
{
struct raw_info *info;
off_t bytes_skipped;
int64_t request = 1024 * 1024 * 1024UL; /* Skip 1 GB at a time. */
info = (struct raw_info *)(a->format->data);
if (info->end_of_file)
return (ARCHIVE_EOF);
info->end_of_file = 1;
for (;;) {
bytes_skipped = __archive_read_skip_lenient(a, request);
if (bytes_skipped < 0)
return (ARCHIVE_FATAL);
if (bytes_skipped < request)
return (ARCHIVE_OK);
/* We skipped all the bytes we asked for. There might
* be more, so try again. */
}
}
