/*
* Allow each registered stream transform to bid on whether
* it wants to handle this stream. Repeat until we've finished
* building the pipeline.
*/
static int
choose_filters(struct archive_read *a)
{
int number_bidders, i, bid, best_bid;
struct archive_read_filter_bidder *bidder, *best_bidder;
struct archive_read_filter *filter;
ssize_t avail;
int r;
for (;;) {
number_bidders = sizeof(a->bidders) / sizeof(a->bidders[0]);
best_bid = 0;
best_bidder = NULL;
bidder = a->bidders;
for (i = 0; i < number_bidders; i++, bidder++) {
if (bidder->bid != NULL) {
bid = (bidder->bid)(bidder, a->filter);
if (bid > best_bid) {
best_bid = bid;
best_bidder = bidder;
}
}
}
/* If no bidder, we're done. */
if (best_bidder == NULL) {
/* Verify the filter by asking it for some data. */
__archive_read_filter_ahead(a->filter, 1, &avail);
if (avail < 0) {
close_filters(a);
free_filters(a);
return (ARCHIVE_FATAL);
}
a->archive.compression_name = a->filter->name;
a->archive.compression_code = a->filter->code;
return (ARCHIVE_OK);
}
filter
= (struct archive_read_filter *)calloc(1, sizeof(*filter));
if (filter == NULL)
return (ARCHIVE_FATAL);
filter->bidder = best_bidder;
filter->archive = a;
filter->upstream = a->filter;
a->filter = filter;
r = (best_bidder->init)(a->filter);
if (r != ARCHIVE_OK) {
close_filters(a);
free_filters(a);
return (ARCHIVE_FATAL);
}
}
}
void
__archive_read_free_filters(struct archive_read *a)
{
/* Make sure filters are closed and their buffers are freed */
close_filters(a);
while (a->filter != NULL) {
struct archive_read_filter *t = a->filter->upstream;
free(a->filter);
a->filter = t;
}
}
/*
* Close the file and all I/O.
*/
static int
_archive_read_close(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
int r = ARCHIVE_OK, r1 = ARCHIVE_OK;
archive_check_magic(&a->archive, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_read_close");
if (a->archive.state == ARCHIVE_STATE_CLOSED)
return (ARCHIVE_OK);
archive_clear_error(&a->archive);
a->archive.state = ARCHIVE_STATE_CLOSED;
/* TODO: Clean up the formatters. */
/* Release the filter objects. */
r1 = close_filters(a);
if (r1 < r)
r = r1;
return (r);
}
int
archive_read_open1(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter *filter;
int slot, e;
archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW,
"archive_read_open");
archive_clear_error(&a->archive);
if (a->client.reader == NULL) {
archive_set_error(&a->archive, EINVAL,
"No reader function provided to archive_read_open");
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
/* Open data source. */
if (a->client.opener != NULL) {
e =(a->client.opener)(&a->archive, a->client.data);
if (e != 0) {
/* If the open failed, call the closer to clean up. */
if (a->client.closer)
(a->client.closer)(&a->archive, a->client.data);
return (e);
}
}
filter = calloc(1, sizeof(*filter));
if (filter == NULL)
return (ARCHIVE_FATAL);
filter->bidder = NULL;
filter->upstream = NULL;
filter->archive = a;
filter->data = a->client.data;
filter->read = client_read_proxy;
filter->skip = client_skip_proxy;
filter->seek = client_seek_proxy;
filter->close = client_close_proxy;
filter->name = "none";
filter->code = ARCHIVE_COMPRESSION_NONE;
a->filter = filter;
/* Build out the input pipeline. */
e = choose_filters(a);
if (e < ARCHIVE_WARN) {
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
slot = choose_format(a);
if (slot < 0) {
close_filters(a);
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
a->format = &(a->formats[slot]);
a->archive.state = ARCHIVE_STATE_HEADER;
return (e);
}
int
archive_read_open1(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter *filter;
int slot, e;
unsigned int i;
archive_check_magic(_a, ARCHIVE_READ_MAGIC, ARCHIVE_STATE_NEW,
"archive_read_open");
archive_clear_error(&a->archive);
if (a->client.reader == NULL) {
archive_set_error(&a->archive, EINVAL,
"No reader function provided to archive_read_open");
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
/* Open data source. */
if (a->client.opener != NULL) {
e =(a->client.opener)(&a->archive, a->client.dataset[0].data);
if (e != 0) {
/* If the open failed, call the closer to clean up. */
if (a->client.closer) {
for (i = 0; i < a->client.nodes; i++)
(a->client.closer)(&a->archive,
a->client.dataset[i].data);
}
return (e);
}
}
filter = calloc(1, sizeof(*filter));
if (filter == NULL)
return (ARCHIVE_FATAL);
filter->bidder = NULL;
filter->upstream = NULL;
filter->archive = a;
filter->data = a->client.dataset[0].data;
filter->open = client_open_proxy;
filter->read = client_read_proxy;
filter->skip = client_skip_proxy;
filter->seek = client_seek_proxy;
filter->close = client_close_proxy;
filter->sswitch = client_switch_proxy;
filter->name = "none";
filter->code = ARCHIVE_FILTER_NONE;
a->filter = filter;
client_switch_proxy(a->filter, 0);
a->client.dataset[0].begin_position = 0;
/* Build out the input pipeline. */
e = choose_filters(a);
if (e < ARCHIVE_WARN) {
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
slot = choose_format(a);
if (slot < 0) {
close_filters(a);
a->archive.state = ARCHIVE_STATE_FATAL;
return (ARCHIVE_FATAL);
}
a->format = &(a->formats[slot]);
a->archive.state = ARCHIVE_STATE_HEADER;
/* Ensure libarchive starts from the first node in a multivolume set */
client_switch_proxy(a->filter, 0);
return (e);
}