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/*
* Copyright 2003-2007 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
* $Header: /var/cvsroot/gentoo-projects/pax-utils/paxinc.c,v 1.12 2008/12/30 13:34:46 vapier Exp $
*
* Copyright 2005-2007 Ned Ludd - <solar@gentoo.org>
* Copyright 2005-2007 Mike Frysinger - <vapier@gentoo.org>
*/
/* stick common symbols here that are needed by paxinc.h */
#define IN_paxinc
#include "paxinc.h"
char do_reverse_endian;
/* some of this ar code was taken from busybox */
#define AR_MAGIC "!<arch>"
#define AR_MAGIC_SIZE (sizeof(AR_MAGIC)-1) /* dont count null byte */
archive_handle *ar_open_fd(const char *filename, int fd)
{
static archive_handle ret;
char buf[AR_MAGIC_SIZE];
ret.filename = filename;
ret.fd = fd;
ret.skip = 0;
ret.extfn = NULL;
if (read(ret.fd, buf, AR_MAGIC_SIZE) != AR_MAGIC_SIZE)
return NULL;
if (strncmp(buf, AR_MAGIC, AR_MAGIC_SIZE))
return NULL;
return &ret;
}
archive_handle *ar_open(const char *filename)
{
int fd;
archive_handle *ret;
if ((fd=open(filename, O_RDONLY)) == -1)
err("Could not open '%s'", filename);
ret = ar_open_fd(filename, fd);
if (ret == NULL)
close(fd);
return ret;
}
archive_member *ar_next(archive_handle *ar)
{
char *s;
size_t len = 0;
static archive_member ret;
if (ar->skip && lseek(ar->fd, ar->skip, SEEK_CUR) == -1) {
close_and_ret:
close(ar->fd);
return NULL;
}
if (read(ar->fd, ret.buf.raw, sizeof(ret.buf.raw)) != sizeof(ret.buf.raw))
goto close_and_ret;
/* ar header starts on an even byte (2 byte aligned)
* '\n' is used for padding */
if (ret.buf.raw[0] == '\n') {
memmove(ret.buf.raw, ret.buf.raw+1, 59);
read(ar->fd, ret.buf.raw+59, 1);
}
if ((ret.buf.formatted.magic[0] != '`') || (ret.buf.formatted.magic[1] != '\n')) {
warn("Invalid ar entry");
goto close_and_ret;
}
if (ret.buf.formatted.name[0] == '/' && ret.buf.formatted.name[1] == '/') {
if (ar->extfn != NULL) {
warn("Duplicate GNU extended filename section");
goto close_and_ret;
}
len = atoi(ret.buf.formatted.size);
/* we will leak this memory */
ar->extfn = xmalloc(sizeof(char) * (len + 1));
if (read(ar->fd, ar->extfn, len) != len)
goto close_and_ret;
ar->extfn[len--] = '\0';
for (; len > 0; len--)
if (ar->extfn[len] == '\n')
ar->extfn[len] = '\0';
ar->skip = 0;
return ar_next(ar);
}
s = ret.buf.formatted.name;
if (s[0] == '#' && s[1] == '1' && s[2] == '/') {
/* BSD extended filename, always in use on Darwin */
len = atoi(s + 3);
if (len <= sizeof(ret.buf.formatted.name)) {
if (read(ar->fd, ret.buf.formatted.name, len) != len)
goto close_and_ret;
} else {
s = alloca(sizeof(char) * len);
if (read(ar->fd, s, len) != len)
goto close_and_ret;
}
} else if (s[0] == '/' && s[1] >= '0' && s[1] <= '9') {
/* GNU extended filename */
if (ar->extfn == NULL) {
warn("GNU extended filename without special data section");
goto close_and_ret;
}
s = ar->extfn + atoi(s + 1);
}
snprintf(ret.name, sizeof(ret.name), "%s:%s", ar->filename, s);
if ((s=strchr(ret.name+strlen(ar->filename), '/')) != NULL)
*s = '\0';
ret.date = atoi(ret.buf.formatted.date);
ret.uid = atoi(ret.buf.formatted.uid);
ret.gid = atoi(ret.buf.formatted.gid);
ret.mode = strtol(ret.buf.formatted.mode, NULL, 8);
ret.size = atoi(ret.buf.formatted.size);
ar->skip = ret.size - len;
return &ret;
}
/* Convert file perms into octal string */
const char *strfileperms(const char *fname)
{
struct stat st;
static char buf[8];
if (stat(fname, &st) == -1)
return "";
snprintf(buf, sizeof(buf), "%o", st.st_mode);
return buf + 2;
}
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