static int archive_entry_seek(stream_t *s, int64_t newpos)
{
struct priv *p = s->priv;
if (p->mpa && !p->broken_seek) {
locale_t oldlocale = uselocale(p->mpa->locale);
int r = archive_seek_data(p->mpa->arch, newpos, SEEK_SET);
uselocale(oldlocale);
if (r >= 0)
return 1;
MP_WARN(s, "possibly unsupported seeking - switching to reopening\n");
p->broken_seek = true;
if (reopen_archive(s) < STREAM_OK)
return -1;
}
// libarchive can't seek in most formats.
if (newpos < s->pos) {
// Hack seeking backwards into working by reopening the archive and
// starting over.
MP_VERBOSE(s, "trying to reopen archive for performing seek\n");
if (reopen_archive(s) < STREAM_OK)
return -1;
s->pos = 0;
}
if (newpos > s->pos) {
// For seeking forwards, just keep reading data (there's no libarchive
// skip function either).
char buffer[4096];
while (newpos > s->pos) {
if (mp_cancel_test(s->cancel))
return -1;
int size = MPMIN(newpos - s->pos, sizeof(buffer));
locale_t oldlocale = uselocale(p->mpa->locale);
int r = archive_read_data(p->mpa->arch, buffer, size);
if (r <= 0) {
if (r == 0 && newpos > p->entry_size) {
MP_ERR(s, "demuxer trying to seek beyond end of archive "
"entry\n");
} else if (r == 0) {
MP_ERR(s, "end of archive entry reached while seeking\n");
} else {
MP_ERR(s, "%s\n", archive_error_string(p->mpa->arch));
}
uselocale(oldlocale);
if (mp_archive_check_fatal(p->mpa, r)) {
mp_archive_free(p->mpa);
p->mpa = NULL;
}
return -1;
}
uselocale(oldlocale);
s->pos += r;
}
}
return 1;
}
static int archive_entry_seek(stream_t *s, int64_t newpos)
{
struct priv *p = s->priv;
if (!p->mpa)
return -1;
if (archive_seek_data(p->mpa->arch, newpos, SEEK_SET) >= 0)
return 1;
// libarchive can't seek in most formats.
if (newpos < s->pos) {
// Hack seeking backwards into working by reopening the archive and
// starting over.
MP_VERBOSE(s, "trying to reopen archive for performing seek\n");
if (reopen_archive(s) < STREAM_OK)
return -1;
s->pos = 0;
}
if (newpos > s->pos) {
// For seeking forwards, just keep reading data (there's no libarchive
// skip function either).
char buffer[4096];
while (newpos > s->pos) {
if (mp_cancel_test(s->cancel))
return -1;
int size = MPMIN(newpos - s->pos, sizeof(buffer));
int r = archive_read_data(p->mpa->arch, buffer, size);
if (r < 0) {
MP_ERR(s, "%s\n", archive_error_string(p->mpa->arch));
return -1;
}
s->pos += r;
}
}
return 1;
}
static int archive_entry_open(stream_t *stream)
{
struct priv *p = talloc_zero(stream, struct priv);
stream->priv = p;
if (!strchr(stream->path, '|'))
return STREAM_ERROR;
char *base = talloc_strdup(p, stream->path);
char *name = strchr(base, '|');
*name++ = '\0';
p->entry_name = name;
mp_url_unescape_inplace(base);
p->src = stream_create(base, STREAM_READ | STREAM_SAFE_ONLY,
stream->cancel, stream->global);
if (!p->src) {
archive_entry_close(stream);
return STREAM_ERROR;
}
int r = reopen_archive(stream);
if (r < STREAM_OK) {
archive_entry_close(stream);
return r;
}
stream->fill_buffer = archive_entry_fill_buffer;
if (p->src->seekable) {
stream->seek = archive_entry_seek;
stream->seekable = true;
}
stream->close = archive_entry_close;
stream->control = archive_entry_control;
stream->streaming = true;
return STREAM_OK;
}
