archive_read_support_filter_lrzip.c [plain text]
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_private.h"
#include "archive_read_private.h"
#define LRZIP_HEADER_MAGIC "LRZI"
#define LRZIP_HEADER_MAGIC_LEN 4
static int lrzip_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int lrzip_bidder_init(struct archive_read_filter *);
static int
lrzip_reader_free(struct archive_read_filter_bidder *self)
{
(void)self;
return (ARCHIVE_OK);
}
int
archive_read_support_filter_lrzip(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *reader;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_lrzip");
if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
reader->data = NULL;
reader->name = "lrzip";
reader->bid = lrzip_bidder_bid;
reader->init = lrzip_bidder_init;
reader->options = NULL;
reader->free = lrzip_reader_free;
archive_set_error(_a, ARCHIVE_ERRNO_MISC,
"Using external lrzip program for lrzip decompression");
return (ARCHIVE_WARN);
}
static int
lrzip_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
const unsigned char *p;
ssize_t avail, len;
int i;
(void)self;
len = 6;
p = __archive_read_filter_ahead(filter, len, &avail);
if (p == NULL || avail == 0)
return (0);
if (memcmp(p, LRZIP_HEADER_MAGIC, LRZIP_HEADER_MAGIC_LEN))
return (0);
if (p[LRZIP_HEADER_MAGIC_LEN])
return 0;
i = p[LRZIP_HEADER_MAGIC_LEN + 1];
if ((i < 6) || (i > 10))
return 0;
return (int)len;
}
static int
lrzip_bidder_init(struct archive_read_filter *self)
{
int r;
r = __archive_read_program(self, "lrzip -d -q");
self->code = ARCHIVE_FILTER_LRZIP;
self->name = "lrzip";
return (r);
}