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freebsd-dev/lib/libarchive/archive_read_support_format_cpio.c
Tim Kientzle b1ff9c25b8 MfP4: Big read filter refactoring. 
This is an attempt to eliminate a lot of redundant
code from the read ("decompression") filters by
changing them to juggle arbitrary-sized blocks
and consolidate reblocking code at a single point
in archive_read.c.

Along the way, I've changed the internal read/consume
API used by the format handlers to a slightly
different style originally suggested by des@.  It
does seem to simplify a lot of common cases.

The most dramatic change is, of course, to
archive_read_support_compression_none(), which
has just evaporated into a no-op as the blocking
code this used to hold has all been moved up
a level.

There's at least one more big round of refactoring
yet to come before the individual filters are as
straightforward as I think they should be...
2008-12-06 06:45:15 +00:00

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/*-
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
/* #include <stdint.h> */ /* See archive_platform.h */
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_private.h"
struct cpio_bin_header {
unsigned char c_magic[2];
unsigned char c_dev[2];
unsigned char c_ino[2];
unsigned char c_mode[2];
unsigned char c_uid[2];
unsigned char c_gid[2];
unsigned char c_nlink[2];
unsigned char c_rdev[2];
unsigned char c_mtime[4];
unsigned char c_namesize[2];
unsigned char c_filesize[4];
};
struct cpio_odc_header {
char c_magic[6];
char c_dev[6];
char c_ino[6];
char c_mode[6];
char c_uid[6];
char c_gid[6];
char c_nlink[6];
char c_rdev[6];
char c_mtime[11];
char c_namesize[6];
char c_filesize[11];
};
struct cpio_newc_header {
char c_magic[6];
char c_ino[8];
char c_mode[8];
char c_uid[8];
char c_gid[8];
char c_nlink[8];
char c_mtime[8];
char c_filesize[8];
char c_devmajor[8];
char c_devminor[8];
char c_rdevmajor[8];
char c_rdevminor[8];
char c_namesize[8];
char c_crc[8];
};
struct links_entry {
struct links_entry *next;
struct links_entry *previous;
int links;
dev_t dev;
ino_t ino;
char *name;
};
#define CPIO_MAGIC 0x13141516
struct cpio {
int magic;
int (*read_header)(struct archive_read *, struct cpio *,
struct archive_entry *, size_t *, size_t *);
struct links_entry *links_head;
struct archive_string entry_name;
struct archive_string entry_linkname;
off_t entry_bytes_remaining;
off_t entry_offset;
off_t entry_padding;
};
static int64_t atol16(const char *, unsigned);
static int64_t atol8(const char *, unsigned);
static int archive_read_format_cpio_bid(struct archive_read *);
static int archive_read_format_cpio_cleanup(struct archive_read *);
static int archive_read_format_cpio_read_data(struct archive_read *,
const void **, size_t *, off_t *);
static int archive_read_format_cpio_read_header(struct archive_read *,
struct archive_entry *);
static int be4(const unsigned char *);
static int find_odc_header(struct archive_read *);
static int find_newc_header(struct archive_read *);
static int header_bin_be(struct archive_read *, struct cpio *,
struct archive_entry *, size_t *, size_t *);
static int header_bin_le(struct archive_read *, struct cpio *,
struct archive_entry *, size_t *, size_t *);
static int header_newc(struct archive_read *, struct cpio *,
struct archive_entry *, size_t *, size_t *);
static int header_odc(struct archive_read *, struct cpio *,
struct archive_entry *, size_t *, size_t *);
static int is_octal(const char *, size_t);
static int is_hex(const char *, size_t);
static int le4(const unsigned char *);
static void record_hardlink(struct cpio *cpio, struct archive_entry *entry);
int
archive_read_support_format_cpio(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct cpio *cpio;
int r;
cpio = (struct cpio *)malloc(sizeof(*cpio));
if (cpio == NULL) {
archive_set_error(&a->archive, ENOMEM, "Can't allocate cpio data");
return (ARCHIVE_FATAL);
}
memset(cpio, 0, sizeof(*cpio));
cpio->magic = CPIO_MAGIC;
r = __archive_read_register_format(a,
cpio,
archive_read_format_cpio_bid,
archive_read_format_cpio_read_header,
archive_read_format_cpio_read_data,
NULL,
archive_read_format_cpio_cleanup);
if (r != ARCHIVE_OK)
free(cpio);
return (ARCHIVE_OK);
}
static int
archive_read_format_cpio_bid(struct archive_read *a)
{
const void *h;
const unsigned char *p;
struct cpio *cpio;
int bid;
cpio = (struct cpio *)(a->format->data);
if ((h = __archive_read_ahead(a, 6, NULL)) == NULL)
return (-1);
p = (const unsigned char *)h;
bid = 0;
if (memcmp(p, "070707", 6) == 0) {
/* ASCII cpio archive (odc, POSIX.1) */
cpio->read_header = header_odc;
bid += 48;
/*
* XXX TODO: More verification; Could check that only octal
* digits appear in appropriate header locations. XXX
*/
} else if (memcmp(p, "070701", 6) == 0) {
/* ASCII cpio archive (SVR4 without CRC) */
cpio->read_header = header_newc;
bid += 48;
/*
* XXX TODO: More verification; Could check that only hex
* digits appear in appropriate header locations. XXX
*/
} else if (memcmp(p, "070702", 6) == 0) {
/* ASCII cpio archive (SVR4 with CRC) */
/* XXX TODO: Flag that we should check the CRC. XXX */
cpio->read_header = header_newc;
bid += 48;
/*
* XXX TODO: More verification; Could check that only hex
* digits appear in appropriate header locations. XXX
*/
} else if (p[0] * 256 + p[1] == 070707) {
/* big-endian binary cpio archives */
cpio->read_header = header_bin_be;
bid += 16;
/* Is more verification possible here? */
} else if (p[0] + p[1] * 256 == 070707) {
/* little-endian binary cpio archives */
cpio->read_header = header_bin_le;
bid += 16;
/* Is more verification possible here? */
} else
return (ARCHIVE_WARN);
return (bid);
}
static int
archive_read_format_cpio_read_header(struct archive_read *a,
struct archive_entry *entry)
{
struct cpio *cpio;
const void *h;
size_t namelength;
size_t name_pad;
int r;
cpio = (struct cpio *)(a->format->data);
r = (cpio->read_header(a, cpio, entry, &namelength, &name_pad));
if (r < ARCHIVE_WARN)
return (r);
/* Read name from buffer. */
h = __archive_read_ahead(a, namelength + name_pad, NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, namelength + name_pad);
archive_strncpy(&cpio->entry_name, (const char *)h, namelength);
archive_entry_set_pathname(entry, cpio->entry_name.s);
cpio->entry_offset = 0;
/* If this is a symlink, read the link contents. */
if (archive_entry_filetype(entry) == AE_IFLNK) {
h = __archive_read_ahead(a, cpio->entry_bytes_remaining, NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, cpio->entry_bytes_remaining);
archive_strncpy(&cpio->entry_linkname, (const char *)h,
cpio->entry_bytes_remaining);
archive_entry_set_symlink(entry, cpio->entry_linkname.s);
cpio->entry_bytes_remaining = 0;
}
/* Compare name to "TRAILER!!!" to test for end-of-archive. */
if (namelength == 11 && strcmp((const char *)h, "TRAILER!!!") == 0) {
/* TODO: Store file location of start of block. */
archive_set_error(&a->archive, 0, NULL);
return (ARCHIVE_EOF);
}
/* Detect and record hardlinks to previously-extracted entries. */
record_hardlink(cpio, entry);
return (r);
}
static int
archive_read_format_cpio_read_data(struct archive_read *a,
const void **buff, size_t *size, off_t *offset)
{
ssize_t bytes_read;
struct cpio *cpio;
cpio = (struct cpio *)(a->format->data);
if (cpio->entry_bytes_remaining > 0) {
*buff = __archive_read_ahead(a, 1, &bytes_read);
if (bytes_read <= 0)
return (ARCHIVE_FATAL);
if (bytes_read > cpio->entry_bytes_remaining)
bytes_read = cpio->entry_bytes_remaining;
*size = bytes_read;
*offset = cpio->entry_offset;
cpio->entry_offset += bytes_read;
cpio->entry_bytes_remaining -= bytes_read;
__archive_read_consume(a, bytes_read);
return (ARCHIVE_OK);
} else {
while (cpio->entry_padding > 0) {
*buff = __archive_read_ahead(a, 1, &bytes_read);
if (bytes_read <= 0)
return (ARCHIVE_FATAL);
if (bytes_read > cpio->entry_padding)
bytes_read = cpio->entry_padding;
__archive_read_consume(a, bytes_read);
cpio->entry_padding -= bytes_read;
}
*buff = NULL;
*size = 0;
*offset = cpio->entry_offset;
return (ARCHIVE_EOF);
}
}
/*
* Skip forward to the next cpio newc header by searching for the
* 07070[12] string. This should be generalized and merged with
* find_odc_header below.
*/
static int
is_hex(const char *p, size_t len)
{
while (len-- > 0) {
if ((*p >= '0' && *p <= '9')
|| (*p >= 'a' && *p <= 'f')
|| (*p >= 'A' && *p <= 'F'))
++p;
else
return (0);
}
return (1);
}
static int
find_newc_header(struct archive_read *a)
{
const void *h;
const char *p, *q;
size_t skip, bytes, skipped = 0;
for (;;) {
h = __archive_read_ahead(a, sizeof(struct cpio_newc_header), &bytes);
if (h == NULL)
return (ARCHIVE_FATAL);
p = h;
q = p + bytes;
/* Try the typical case first, then go into the slow search.*/
if (memcmp("07070", p, 5) == 0
&& (p[5] == '1' || p[5] == '2')
&& is_hex(p, sizeof(struct cpio_newc_header)))
return (ARCHIVE_OK);
/*
* Scan ahead until we find something that looks
* like an odc header.
*/
while (p + sizeof(struct cpio_newc_header) < q) {
switch (p[5]) {
case '1':
case '2':
if (memcmp("07070", p, 5) == 0
&& is_hex(p, sizeof(struct cpio_newc_header))) {
skip = p - (const char *)h;
__archive_read_consume(a, skip);
skipped += skip;
if (skipped > 0) {
archive_set_error(&a->archive,
0,
"Skipped %d bytes before "
"finding valid header",
(int)skipped);
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
p += 2;
break;
case '0':
p++;
break;
default:
p += 6;
break;
}
}
skip = p - (const char *)h;
__archive_read_consume(a, skip);
skipped += skip;
}
}
static int
header_newc(struct archive_read *a, struct cpio *cpio,
struct archive_entry *entry, size_t *namelength, size_t *name_pad)
{
const void *h;
const struct cpio_newc_header *header;
int r;
r = find_newc_header(a);
if (r < ARCHIVE_WARN)
return (r);
/* Read fixed-size portion of header. */
h = __archive_read_ahead(a, sizeof(struct cpio_newc_header), NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, sizeof(struct cpio_newc_header));
/* Parse out hex fields. */
header = (const struct cpio_newc_header *)h;
if (memcmp(header->c_magic, "070701", 6) == 0) {
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_NOCRC;
a->archive.archive_format_name = "ASCII cpio (SVR4 with no CRC)";
} else if (memcmp(header->c_magic, "070702", 6) == 0) {
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_SVR4_CRC;
a->archive.archive_format_name = "ASCII cpio (SVR4 with CRC)";
} else {
/* TODO: Abort here? */
}
archive_entry_set_devmajor(entry, atol16(header->c_devmajor, sizeof(header->c_devmajor)));
archive_entry_set_devminor(entry, atol16(header->c_devminor, sizeof(header->c_devminor)));
archive_entry_set_ino(entry, atol16(header->c_ino, sizeof(header->c_ino)));
archive_entry_set_mode(entry, atol16(header->c_mode, sizeof(header->c_mode)));
archive_entry_set_uid(entry, atol16(header->c_uid, sizeof(header->c_uid)));
archive_entry_set_gid(entry, atol16(header->c_gid, sizeof(header->c_gid)));
archive_entry_set_nlink(entry, atol16(header->c_nlink, sizeof(header->c_nlink)));
archive_entry_set_rdevmajor(entry, atol16(header->c_rdevmajor, sizeof(header->c_rdevmajor)));
archive_entry_set_rdevminor(entry, atol16(header->c_rdevminor, sizeof(header->c_rdevminor)));
archive_entry_set_mtime(entry, atol16(header->c_mtime, sizeof(header->c_mtime)), 0);
*namelength = atol16(header->c_namesize, sizeof(header->c_namesize));
/* Pad name to 2 more than a multiple of 4. */
*name_pad = (2 - *namelength) & 3;
/*
* Note: entry_bytes_remaining is at least 64 bits and
* therefore guaranteed to be big enough for a 33-bit file
* size.
*/
cpio->entry_bytes_remaining =
atol16(header->c_filesize, sizeof(header->c_filesize));
archive_entry_set_size(entry, cpio->entry_bytes_remaining);
/* Pad file contents to a multiple of 4. */
cpio->entry_padding = 3 & -cpio->entry_bytes_remaining;
return (r);
}
/*
* Skip forward to the next cpio odc header by searching for the
* 070707 string. This is a hand-optimized search that could
* probably be easily generalized to handle all character-based
* cpio variants.
*/
static int
is_octal(const char *p, size_t len)
{
while (len-- > 0) {
if (*p < '0' || *p > '7')
return (0);
++p;
}
return (1);
}
static int
find_odc_header(struct archive_read *a)
{
const void *h;
const char *p, *q;
size_t skip, bytes, skipped = 0;
for (;;) {
h = __archive_read_ahead(a, sizeof(struct cpio_odc_header), &bytes);
if (h == NULL)
return (ARCHIVE_FATAL);
p = h;
q = p + bytes;
/* Try the typical case first, then go into the slow search.*/
if (memcmp("070707", p, 6) == 0
&& is_octal(p, sizeof(struct cpio_odc_header)))
return (ARCHIVE_OK);
/*
* Scan ahead until we find something that looks
* like an odc header.
*/
while (p + sizeof(struct cpio_odc_header) < q) {
switch (p[5]) {
case '7':
if (memcmp("070707", p, 6) == 0
&& is_octal(p, sizeof(struct cpio_odc_header))) {
skip = p - (const char *)h;
__archive_read_consume(a, skip);
skipped += skip;
if (skipped > 0) {
archive_set_error(&a->archive,
0,
"Skipped %d bytes before "
"finding valid header",
(int)skipped);
return (ARCHIVE_WARN);
}
return (ARCHIVE_OK);
}
p += 2;
break;
case '0':
p++;
break;
default:
p += 6;
break;
}
}
skip = p - (const char *)h;
__archive_read_consume(a, skip);
skipped += skip;
}
}
static int
header_odc(struct archive_read *a, struct cpio *cpio,
struct archive_entry *entry, size_t *namelength, size_t *name_pad)
{
const void *h;
int r;
const struct cpio_odc_header *header;
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_POSIX;
a->archive.archive_format_name = "POSIX octet-oriented cpio";
/* Find the start of the next header. */
r = find_odc_header(a);
if (r < ARCHIVE_WARN)
return (r);
/* Read fixed-size portion of header. */
h = __archive_read_ahead(a, sizeof(struct cpio_odc_header), NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, sizeof(struct cpio_odc_header));
/* Parse out octal fields. */
header = (const struct cpio_odc_header *)h;
archive_entry_set_dev(entry, atol8(header->c_dev, sizeof(header->c_dev)));
archive_entry_set_ino(entry, atol8(header->c_ino, sizeof(header->c_ino)));
archive_entry_set_mode(entry, atol8(header->c_mode, sizeof(header->c_mode)));
archive_entry_set_uid(entry, atol8(header->c_uid, sizeof(header->c_uid)));
archive_entry_set_gid(entry, atol8(header->c_gid, sizeof(header->c_gid)));
archive_entry_set_nlink(entry, atol8(header->c_nlink, sizeof(header->c_nlink)));
archive_entry_set_rdev(entry, atol8(header->c_rdev, sizeof(header->c_rdev)));
archive_entry_set_mtime(entry, atol8(header->c_mtime, sizeof(header->c_mtime)), 0);
*namelength = atol8(header->c_namesize, sizeof(header->c_namesize));
*name_pad = 0; /* No padding of filename. */
/*
* Note: entry_bytes_remaining is at least 64 bits and
* therefore guaranteed to be big enough for a 33-bit file
* size.
*/
cpio->entry_bytes_remaining =
atol8(header->c_filesize, sizeof(header->c_filesize));
archive_entry_set_size(entry, cpio->entry_bytes_remaining);
cpio->entry_padding = 0;
return (r);
}
static int
header_bin_le(struct archive_read *a, struct cpio *cpio,
struct archive_entry *entry, size_t *namelength, size_t *name_pad)
{
const void *h;
const struct cpio_bin_header *header;
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_LE;
a->archive.archive_format_name = "cpio (little-endian binary)";
/* Read fixed-size portion of header. */
h = __archive_read_ahead(a, sizeof(struct cpio_bin_header), NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, sizeof(struct cpio_bin_header));
/* Parse out binary fields. */
header = (const struct cpio_bin_header *)h;
archive_entry_set_dev(entry, header->c_dev[0] + header->c_dev[1] * 256);
archive_entry_set_ino(entry, header->c_ino[0] + header->c_ino[1] * 256);
archive_entry_set_mode(entry, header->c_mode[0] + header->c_mode[1] * 256);
archive_entry_set_uid(entry, header->c_uid[0] + header->c_uid[1] * 256);
archive_entry_set_gid(entry, header->c_gid[0] + header->c_gid[1] * 256);
archive_entry_set_nlink(entry, header->c_nlink[0] + header->c_nlink[1] * 256);
archive_entry_set_rdev(entry, header->c_rdev[0] + header->c_rdev[1] * 256);
archive_entry_set_mtime(entry, le4(header->c_mtime), 0);
*namelength = header->c_namesize[0] + header->c_namesize[1] * 256;
*name_pad = *namelength & 1; /* Pad to even. */
cpio->entry_bytes_remaining = le4(header->c_filesize);
archive_entry_set_size(entry, cpio->entry_bytes_remaining);
cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
return (ARCHIVE_OK);
}
static int
header_bin_be(struct archive_read *a, struct cpio *cpio,
struct archive_entry *entry, size_t *namelength, size_t *name_pad)
{
const void *h;
const struct cpio_bin_header *header;
a->archive.archive_format = ARCHIVE_FORMAT_CPIO_BIN_BE;
a->archive.archive_format_name = "cpio (big-endian binary)";
/* Read fixed-size portion of header. */
h = __archive_read_ahead(a, sizeof(struct cpio_bin_header), NULL);
if (h == NULL)
return (ARCHIVE_FATAL);
__archive_read_consume(a, sizeof(struct cpio_bin_header));
/* Parse out binary fields. */
header = (const struct cpio_bin_header *)h;
archive_entry_set_dev(entry, header->c_dev[0] * 256 + header->c_dev[1]);
archive_entry_set_ino(entry, header->c_ino[0] * 256 + header->c_ino[1]);
archive_entry_set_mode(entry, header->c_mode[0] * 256 + header->c_mode[1]);
archive_entry_set_uid(entry, header->c_uid[0] * 256 + header->c_uid[1]);
archive_entry_set_gid(entry, header->c_gid[0] * 256 + header->c_gid[1]);
archive_entry_set_nlink(entry, header->c_nlink[0] * 256 + header->c_nlink[1]);
archive_entry_set_rdev(entry, header->c_rdev[0] * 256 + header->c_rdev[1]);
archive_entry_set_mtime(entry, be4(header->c_mtime), 0);
*namelength = header->c_namesize[0] * 256 + header->c_namesize[1];
*name_pad = *namelength & 1; /* Pad to even. */
cpio->entry_bytes_remaining = be4(header->c_filesize);
archive_entry_set_size(entry, cpio->entry_bytes_remaining);
cpio->entry_padding = cpio->entry_bytes_remaining & 1; /* Pad to even. */
return (ARCHIVE_OK);
}
static int
archive_read_format_cpio_cleanup(struct archive_read *a)
{
struct cpio *cpio;
cpio = (struct cpio *)(a->format->data);
/* Free inode->name map */
while (cpio->links_head != NULL) {
struct links_entry *lp = cpio->links_head->next;
if (cpio->links_head->name)
free(cpio->links_head->name);
free(cpio->links_head);
cpio->links_head = lp;
}
archive_string_free(&cpio->entry_name);
free(cpio);
(a->format->data) = NULL;
return (ARCHIVE_OK);
}
static int
le4(const unsigned char *p)
{
return ((p[0]<<16) + (p[1]<<24) + (p[2]<<0) + (p[3]<<8));
}
static int
be4(const unsigned char *p)
{
return (p[0] + (p[1]<<8) + (p[2]<<16) + (p[3]<<24));
}
/*
* Note that this implementation does not (and should not!) obey
* locale settings; you cannot simply substitute strtol here, since
* it does obey locale.
*/
static int64_t
atol8(const char *p, unsigned char_cnt)
{
int64_t l;
int digit;
l = 0;
while (char_cnt-- > 0) {
if (*p >= '0' && *p <= '7')
digit = *p - '0';
else
return (l);
p++;
l <<= 3;
l |= digit;
}
return (l);
}
static int64_t
atol16(const char *p, unsigned char_cnt)
{
int64_t l;
int digit;
l = 0;
while (char_cnt-- > 0) {
if (*p >= 'a' && *p <= 'f')
digit = *p - 'a' + 10;
else if (*p >= 'A' && *p <= 'F')
digit = *p - 'A' + 10;
else if (*p >= '0' && *p <= '9')
digit = *p - '0';
else
return (l);
p++;
l <<= 4;
l |= digit;
}
return (l);
}
static void
record_hardlink(struct cpio *cpio, struct archive_entry *entry)
{
struct links_entry *le;
dev_t dev;
ino_t ino;
dev = archive_entry_dev(entry);
ino = archive_entry_ino(entry);
/*
* First look in the list of multiply-linked files. If we've
* already dumped it, convert this entry to a hard link entry.
*/
for (le = cpio->links_head; le; le = le->next) {
if (le->dev == dev && le->ino == ino) {
archive_entry_copy_hardlink(entry, le->name);
if (--le->links <= 0) {
if (le->previous != NULL)
le->previous->next = le->next;
if (le->next != NULL)
le->next->previous = le->previous;
if (cpio->links_head == le)
cpio->links_head = le->next;
free(le->name);
free(le);
}
return;
}
}
le = (struct links_entry *)malloc(sizeof(struct links_entry));
if (le == NULL)
__archive_errx(1, "Out of memory adding file to list");
if (cpio->links_head != NULL)
cpio->links_head->previous = le;
le->next = cpio->links_head;
le->previous = NULL;
cpio->links_head = le;
le->dev = dev;
le->ino = ino;
le->links = archive_entry_nlink(entry) - 1;
le->name = strdup(archive_entry_pathname(entry));
if (le->name == NULL)
__archive_errx(1, "Out of memory adding file to list");
}
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