コード例 #1
0
ファイル: t-ar.c プロジェクト: Felllini/sprezzos-world
static void
test_ar_normalize_name(void)
{
	struct ar_hdr arh;

	strncpy(arh.ar_name, "member-name/    ", sizeof(arh.ar_name));
	dpkg_ar_normalize_name(&arh);
	test_str(arh.ar_name, ==, "member-name");

	strncpy(arh.ar_name, "member-name     ", sizeof(arh.ar_name));
	dpkg_ar_normalize_name(&arh);
	test_str(arh.ar_name, ==, "member-name");
}
コード例 #2
0
ファイル: extract.c プロジェクト: HiLink-Mark/dpkg-dev
void
extracthalf(const char *debar, const char *dir,
            enum dpkg_tar_options taroption, int admininfo)
{
  struct dpkg_error err;
  const char *errstr;
  char versionbuf[40];
  struct deb_version version;
  off_t ctrllennum, memberlen = 0;
  ssize_t r;
  int dummy;
  pid_t c1=0,c2,c3;
  int p1[2], p2[2];
  int p2_out;
  int arfd;
  struct stat stab;
  char nlc;
  int adminmember = -1;
  bool header_done;
  enum compressor_type decompressor = COMPRESSOR_TYPE_GZIP;

  if (strcmp(debar, "-") == 0)
    arfd = STDIN_FILENO;
  else
    arfd = open(debar, O_RDONLY);
  if (arfd < 0)
    ohshite(_("failed to read archive '%.255s'"), debar);
  if (fstat(arfd, &stab))
    ohshite(_("failed to fstat archive"));

  r = read_line(arfd, versionbuf, strlen(DPKG_AR_MAGIC), sizeof(versionbuf) - 1);
  if (r < 0)
    read_fail(r, debar, _("archive magic version number"));

  if (strcmp(versionbuf, DPKG_AR_MAGIC) == 0) {
    ctrllennum= 0;
    header_done = false;
    for (;;) {
      struct ar_hdr arh;

      r = fd_read(arfd, &arh, sizeof(arh));
      if (r != sizeof(arh))
        read_fail(r, debar, _("archive member header"));

      dpkg_ar_normalize_name(&arh);

      if (dpkg_ar_member_is_illegal(&arh))
        ohshit(_("file '%.250s' is corrupt - bad archive header magic"), debar);
      memberlen = dpkg_ar_member_get_size(debar, &arh);
      if (!header_done) {
        char *infobuf;

        if (strncmp(arh.ar_name, DEBMAGIC, sizeof(arh.ar_name)) != 0)
          ohshit(_("file '%.250s' is not a debian binary archive (try dpkg-split?)"),
                 debar);
        infobuf= m_malloc(memberlen+1);
        r = fd_read(arfd, infobuf, memberlen + (memberlen & 1));
        if (r != (memberlen + (memberlen & 1)))
          read_fail(r, debar, _("archive information header member"));
        infobuf[memberlen] = '\0';

        if (strchr(infobuf, '\n') == NULL)
          ohshit(_("archive has no newlines in header"));
        errstr = deb_version_parse(&version, infobuf);
        if (errstr)
          ohshit(_("archive has invalid format version: %s"), errstr);
        if (version.major != 2)
          ohshit(_("archive is format version %d.%d; get a newer dpkg-deb"),
                 version.major, version.minor);

        free(infobuf);

        header_done = true;
      } else if (arh.ar_name[0] == '_') {
        /* Members with ‘_’ are noncritical, and if we don't understand
         * them we skip them. */
        if (fd_skip(arfd, memberlen + (memberlen & 1), &err) < 0)
          ohshit(_("cannot skip archive member from '%s': %s"), debar, err.str);
      } else {
        if (strncmp(arh.ar_name, ADMINMEMBER, strlen(ADMINMEMBER)) == 0) {
          const char *extension = arh.ar_name + strlen(ADMINMEMBER);

	  adminmember = 1;
          decompressor = compressor_find_by_extension(extension);
          if (decompressor != COMPRESSOR_TYPE_NONE &&
              decompressor != COMPRESSOR_TYPE_GZIP &&
              decompressor != COMPRESSOR_TYPE_XZ)
            ohshit(_("archive '%s' uses unknown compression for member '%.*s', "
                     "giving up"),
                   debar, (int)sizeof(arh.ar_name), arh.ar_name);
        } else {
          if (adminmember != 1)
            ohshit(_("archive '%s' has premature member '%.*s' before '%s', "
                     "giving up"),
                   debar, (int)sizeof(arh.ar_name), arh.ar_name, ADMINMEMBER);

	  if (strncmp(arh.ar_name, DATAMEMBER, strlen(DATAMEMBER)) == 0) {
	    const char *extension = arh.ar_name + strlen(DATAMEMBER);

	    adminmember= 0;
	    decompressor = compressor_find_by_extension(extension);
            if (decompressor == COMPRESSOR_TYPE_UNKNOWN)
              ohshit(_("archive '%s' uses unknown compression for member '%.*s', "
                       "giving up"),
                     debar, (int)sizeof(arh.ar_name), arh.ar_name);
          } else {
            ohshit(_("archive '%s' has premature member '%.*s' before '%s', "
                     "giving up"),
                   debar, (int)sizeof(arh.ar_name), arh.ar_name, DATAMEMBER);
          }
        }
        if (adminmember == 1) {
          if (ctrllennum != 0)
            ohshit(_("archive '%.250s' contains two control members, giving up"),
                   debar);
          ctrllennum= memberlen;
        }
        if (!adminmember != !admininfo) {
          if (fd_skip(arfd, memberlen + (memberlen & 1), &err) < 0)
            ohshit(_("cannot skip archive member from '%s': %s"), debar, err.str);
        } else {
          /* Yes! - found it. */
          break;
        }
      }
    }

    if (admininfo >= 2) {
      printf(_(" new debian package, version %d.%d.\n"
               " size %jd bytes: control archive=%jd bytes.\n"),
             version.major, version.minor,
             (intmax_t)stab.st_size, (intmax_t)ctrllennum);
      m_output(stdout, _("<standard output>"));
    }
  } else if (strncmp(versionbuf, "0.93", 4) == 0) {
    char ctrllenbuf[40];
    int l;

    l = strlen(versionbuf);

    if (strchr(versionbuf, '\n') == NULL)
      ohshit(_("archive has no newlines in header"));
    errstr = deb_version_parse(&version, versionbuf);
    if (errstr)
      ohshit(_("archive has invalid format version: %s"), errstr);

    r = read_line(arfd, ctrllenbuf, 1, sizeof(ctrllenbuf) - 1);
    if (r < 0)
      read_fail(r, debar, _("archive control member size"));
    if (sscanf(ctrllenbuf, "%jd%c%d", &ctrllennum, &nlc, &dummy) != 2 ||
        nlc != '\n')
      ohshit(_("archive has malformatted control member size '%s'"), ctrllenbuf);

    if (admininfo) {
      memberlen = ctrllennum;
    } else {
      memberlen = stab.st_size - ctrllennum - strlen(ctrllenbuf) - l;
      if (fd_skip(arfd, ctrllennum, &err) < 0)
        ohshit(_("cannot skip archive control member from '%s': %s"), debar,
               err.str);
    }

    if (admininfo >= 2) {
      printf(_(" old debian package, version %d.%d.\n"
               " size %jd bytes: control archive=%jd, main archive=%jd.\n"),
             version.major, version.minor,
             (intmax_t)stab.st_size, (intmax_t)ctrllennum,
             (intmax_t)(stab.st_size - ctrllennum - strlen(ctrllenbuf) - l));
      m_output(stdout, _("<standard output>"));
    }
  } else {
    if (strncmp(versionbuf, "!<arch>", 7) == 0) {
      notice(_("file looks like it might be an archive which has been\n"
               " corrupted by being downloaded in ASCII mode"));
    }

    ohshit(_("'%.255s' is not a debian format archive"), debar);
  }

  m_pipe(p1);
  c1 = subproc_fork();
  if (!c1) {
    close(p1[0]);
    if (fd_fd_copy(arfd, p1[1], memberlen, &err) < 0)
      ohshit(_("cannot copy archive member from '%s' to decompressor pipe: %s"),
             debar, err.str);
    if (close(p1[1]))
      ohshite(_("cannot close decompressor pipe"));
    exit(0);
  }
  close(p1[1]);

  if (taroption) {
    m_pipe(p2);
    p2_out = p2[1];
  } else {
    p2_out = 1;
  }

  c2 = subproc_fork();
  if (!c2) {
    if (taroption)
      close(p2[0]);
    decompress_filter(decompressor, p1[0], p2_out,
                      _("decompressing archive member"));
    exit(0);
  }
  close(p1[0]);
  close(arfd);
  if (taroption) close(p2[1]);

  if (taroption) {
    c3 = subproc_fork();
    if (!c3) {
      struct command cmd;

      command_init(&cmd, TAR, "tar");
      command_add_arg(&cmd, "tar");

      if ((taroption & DPKG_TAR_LIST) && (taroption & DPKG_TAR_EXTRACT))
        command_add_arg(&cmd, "-xv");
      else if (taroption & DPKG_TAR_EXTRACT)
        command_add_arg(&cmd, "-x");
      else if (taroption & DPKG_TAR_LIST)
        command_add_arg(&cmd, "-tv");
      else
        internerr("unknown or missing tar action '%d'", taroption);

      if (taroption & DPKG_TAR_PERMS)
        command_add_arg(&cmd, "-p");
      if (taroption & DPKG_TAR_NOMTIME)
        command_add_arg(&cmd, "-m");

      command_add_arg(&cmd, "-f");
      command_add_arg(&cmd, "-");
      command_add_arg(&cmd, "--warning=no-timestamp");

      m_dup2(p2[0],0);
      close(p2[0]);

      unsetenv("TAR_OPTIONS");

      if (dir) {
        if (chdir(dir)) {
          if (errno != ENOENT)
            ohshite(_("failed to chdir to directory"));

          if (mkdir(dir, 0777))
            ohshite(_("failed to create directory"));
          if (chdir(dir))
            ohshite(_("failed to chdir to directory after creating it"));
        }
      }

      command_exec(&cmd);
    }
    close(p2[0]);
    subproc_reap(c3, "tar", 0);
  }

  subproc_reap(c2, _("<decompress>"), SUBPROC_NOPIPE);
  if (c1 != -1)
    subproc_reap(c1, _("paste"), 0);
  if (version.major == 0 && admininfo) {
    /* Handle the version as a float to preserve the behaviour of old code,
     * because even if the format is defined to be padded by 0's that might
     * not have been always true for really ancient versions... */
    while (version.minor && (version.minor % 10) == 0)
      version.minor /= 10;

    if (version.minor ==  931)
      movecontrolfiles(OLDOLDDEBDIR);
    else if (version.minor == 932 || version.minor == 933)
      movecontrolfiles(OLDDEBDIR);
  }
}
コード例 #3
0
ファイル: extract_deb.c プロジェクト: 1990gongrui/leetcode
int main(int argc, char *argv[]) 
{
    char cwd[PATH_MAX] = { '\0' };
    char *dir = NULL;
    enum dpkg_tar_options taroption = DPKG_TAR_EXTRACT | DPKG_TAR_NOMTIME;
    int admininfo = 0;
    char *debar = argv[1];
    int arfd = -1;
    struct stat stab;
    char versionbuf[40] = { '\0' };
    ssize_t r;
    off_t ctrllennum, memberlen = 0;
    bool header_done;
    char *infobuf = NULL;
    struct dpkg_error err;
    const char *errstr;
    struct deb_version version;
    int adminmember = -1;
    enum compressor_type decompressor = COMPRESSOR_TYPE_GZIP;
    char nlc;
    int dummy;
    int p1[2], p2[2];
    pid_t c1 = 0, c2, c3;
    int p2_out;

    if (getcwd(cwd, PATH_MAX)) {
        dir = m_malloc(PATH_MAX);
        snprintf(dir, PATH_MAX - 1, "%s/extract", cwd);
    }

    arfd = open(debar, O_RDONLY);
    if (arfd < 0)
        ohshite("failed to read archive %s", debar);
    if (fstat(arfd, &stab))
        ohshite("failed to fstat archive");

    r = read_line(arfd, 
                  versionbuf, 
                  strlen(DPKG_AR_MAGIC), 
                  sizeof(versionbuf) - 1);
    if (r < 0)
        read_fail(r, debar, "archive magic version number");

    if (strcmp(versionbuf, DPKG_AR_MAGIC) == 0) {
        ctrllennum = 0;
        header_done = false;
        for (;;) {
            struct ar_hdr arh;
        
            r = fd_read(arfd, &arh, sizeof(arh));
            if (r != sizeof(arh))
                read_fail(r, debar, "archive member header");

            dpkg_ar_normalize_name(&arh);

            if (dpkg_ar_member_is_illegal(&arh)) {
                ohshit("file '%.250s' is corrupt - bad archive header magic", 
                       debar);
            }

            memberlen = dpkg_ar_member_get_size(debar, &arh);
            if (!header_done) {
                infobuf = NULL;

                if (strncmp(arh.ar_name, DEBMAGIC, sizeof(arh.ar_name)) != 0) {
                    ohshit("file '%.250s' is not a debian binary archive "
                           "(try dpkg-split?)", debar);
                }

                infobuf = m_malloc(memberlen + 1);
                r = fd_read(arfd, infobuf, memberlen + (memberlen & 1));
                if (r != (memberlen + (memberlen & 1)))
                    read_fail(r, debar, "archive information header member");
                infobuf[memberlen] = '\0';

                if (strchr(infobuf, '\n') == NULL)
                    ohshit("archive has no newlines in header");

                errstr = deb_version_parse(&version, infobuf);
                if (errstr)
                    ohshit("archive has invalid format version: %s", errstr);
                if (version.major != 2) {
                    ohshit("archive is format version %d.%d; get a newer dpkg-deb",
                           version.major, version.minor);
                }

                if (infobuf) {
                    free(infobuf);
                    infobuf = NULL;
                }

                header_done = true;
            } else if (arh.ar_name[0] == '_') {
                if (fd_skip(arfd, memberlen + (memberlen & 1), &err) < 0) {
                    ohshit("cannot skip archive member from '%s': %s", 
                           debar, err.str);
                }
            } else {
				if (strncmp(arh.ar_name, ADMINMEMBER, strlen(ADMINMEMBER)) == 0) {
                    const char *extension = arh.ar_name + strlen(ADMINMEMBER);

	                adminmember = 1;
                    decompressor = compressor_find_by_extension(extension);
                    if (decompressor != COMPRESSOR_TYPE_NONE &&
                        decompressor != COMPRESSOR_TYPE_GZIP &&
                        decompressor != COMPRESSOR_TYPE_XZ) {
                        ohshit("ERROR: archive '%s' uses unknown compression "
                               "for member '%.*s', giving up", 
                               debar, (int)sizeof(arh.ar_name), arh.ar_name);
                    }
                } else {
                    if (adminmember != 1) {
                        ohshit("archive '%s' has premature member '%.*s' "
                               "before '%s', giving up",
                               debar, (int)sizeof(arh.ar_name), arh.ar_name, 
                               ADMINMEMBER);
                    }

	                if (strncmp(arh.ar_name, DATAMEMBER, strlen(DATAMEMBER)) == 0) {
	                    const char *extension = arh.ar_name + strlen(DATAMEMBER);

	                    adminmember = 0;
	                    decompressor = compressor_find_by_extension(extension);
                        if (decompressor == COMPRESSOR_TYPE_UNKNOWN) {
                            ohshit("archive '%s' uses unknown "
                                   "compression for member '%.*s', giving up",
                                   debar, (int)sizeof(arh.ar_name), arh.ar_name);
                        }
                    } else {
                        ohshit("archive '%s' has premature member '%.*s' "
                               "before '%s', giving up",
                               debar, (int)sizeof(arh.ar_name), arh.ar_name, DATAMEMBER);
                    }
                }
                if (adminmember == 1) {
                    if (ctrllennum != 0) {
                        ohshit("archive '%.250s' contains two control members, giving up",
                              debar);
                    }
                    ctrllennum = memberlen;
                }
                if (!adminmember != !admininfo) {
                    if (fd_skip(arfd, memberlen + (memberlen & 1), &err) < 0) {
                        ohshit("cannot skip archive member from '%s': %s", 
                               debar, err.str);
                    }
                } else {
                    break;
                }
            }
        }

        if (admininfo >= 2) {
            printf(" new debian package, version %d.%d.\n"
                   " size %jd bytes: control archive=%jd bytes.\n",
                   version.major, version.minor,
                   (intmax_t)stab.st_size, (intmax_t)ctrllennum);
            m_output(stdout, "<standard output>");
        }
    } else if (strncmp(versionbuf, "0.93", 4) == 0) {
        char ctrllenbuf[40] = { '\0' };
        int l;

        l = strlen(versionbuf);

        if (strchr(versionbuf, '\n') == NULL)
            ohshit("archive has no newlines in header");
        errstr = deb_version_parse(&version, versionbuf);
        if (errstr)
            ohshit("archive has invalid format version: %s", errstr);

        r = read_line(arfd, ctrllenbuf, 1, sizeof(ctrllenbuf));
        if (r < 0)
            read_fail(r, debar, "archive control member size");
        if (sscanf(ctrllenbuf, "%jd%c%d", &ctrllennum, &nlc, &dummy) != 2 || 
            nlc != '\n') {
            ohshit("archive has malformatted control member size '%s'", 
                   ctrllenbuf);
        }

        if (admininfo) {
            memberlen = ctrllennum;
        } else {
            memberlen = stab.st_size - ctrllennum - strlen(ctrllenbuf) - l;
            if (fd_skip(arfd, ctrllennum, &err) < 0) {
                ohshit("cannot skip archive control member from '%s': %s", 
                        debar, err.str);
            }
        }

        if (admininfo >= 2) {
            printf(" old debian package, version %d.%d.\n"
                   " size %jd bytes: control archive=%jd, main archive=%jd.\n",
                   version.major, version.minor,
                   (intmax_t)stab.st_size, (intmax_t)ctrllennum,
                   (intmax_t)(stab.st_size - ctrllennum - strlen(ctrllenbuf) - l));
            m_output(stdout, "<standard output>");
        }
    } else {
        if (strncmp(versionbuf, "!<arch>", 7) == 0) {
            notice("file looks like it might be an archive which has been\n"
                   " corrupted by being downloaded in ASCII mode");
        }

        ohshit("'%.255s' is not a debian format archive", debar);
    }

    m_pipe(p1);
    c1 = subproc_fork();
    if (!c1) {
        close(p1[0]);
        if (fd_fd_copy(arfd, p1[1], memberlen, &err) < 0)
            ohshit("cannot copy archive member from '%s' to decompressor pipe: %s",
             debar, err.str);
        if (close(p1[1]))
            ohshite("cannot close decompressor pipe");
        exit(0);
    }
    close(p1[1]);

    if (taroption) {
        m_pipe(p2);
        p2_out = p2[1];
    } else {
        p2_out = 1;
    }

    c2 = subproc_fork();
    if (!c2) {
        if (taroption)
            close(p2[0]);
        decompress_filter(decompressor, p1[0], p2_out,
                          "decompressing archive member");
        exit(0);
    }
    close(p1[0]);
    close(arfd);
    if (taroption) 
        close(p2[1]);

    if (taroption) {
        c3 = subproc_fork();
        if (!c3) {
            struct command cmd;

            command_init(&cmd, TAR, "tar");
            command_add_arg(&cmd, "tar");

            if ((taroption & DPKG_TAR_LIST) && (taroption & DPKG_TAR_EXTRACT))
                command_add_arg(&cmd, "-xv");
            else if (taroption & DPKG_TAR_EXTRACT)
                command_add_arg(&cmd, "-x");
            else if (taroption & DPKG_TAR_LIST)
                command_add_arg(&cmd, "-tv");
            else
                internerr("unknown or missing tar action '%d'", taroption);

        if (taroption & DPKG_TAR_PERMS)
            command_add_arg(&cmd, "-p");
        if (taroption & DPKG_TAR_NOMTIME)
            command_add_arg(&cmd, "-m");

        command_add_arg(&cmd, "-f");
        command_add_arg(&cmd, "-");
        command_add_arg(&cmd, "--warning=no-timestamp");

        m_dup2(p2[0],0);
        close(p2[0]);

        unsetenv("TAR_OPTIONS");

        if (dir) {
            if (chdir(dir)) {
                if (errno != ENOENT)
                    ohshite("failed to chdir to directory");

                if (mkdir(dir, 0777))
                    ohshite("failed to create directory");
                if (chdir(dir))
                    ohshite("failed to chdir to directory after creating it");
                }
            }

            command_exec(&cmd);
        }
        close(p2[0]);
        subproc_reap(c3, "tar", 0);
    }

    subproc_reap(c2, "<decompress>", SUBPROC_NOPIPE);
    if (c1 != -1)
        subproc_reap(c1, "paste", 0);
    if (version.major == 0 && admininfo) {
        while (version.minor && (version.minor % 10) == 0)
            version.minor /= 10;

        if (version.minor ==  931)
            movecontrolfiles(OLDOLDDEBDIR);
        else if (version.minor == 932 || version.minor == 933)
            movecontrolfiles(OLDDEBDIR);
    }

    return 0;
}
コード例 #4
0
ファイル: info.c プロジェクト: CharizTeam/dpkg
/**
 * Read a deb-split part archive.
 *
 * @return Part info (nfmalloc'd) if was an archive part and we read it,
 *         NULL if it wasn't.
 */
struct partinfo *
read_info(struct dpkg_ar *ar, struct partinfo *ir)
{
  static char *readinfobuf= NULL;
  static size_t readinfobuflen= 0;

  size_t thisilen;
  intmax_t templong;
  char magicbuf[sizeof(DPKG_AR_MAGIC) - 1], *rip, *partnums, *slash;
  const char *err;
  struct ar_hdr arh;
  ssize_t rc;

  rc = fd_read(ar->fd, magicbuf, sizeof(magicbuf));
  if (rc != sizeof(magicbuf)) {
    if (rc < 0)
      ohshite(_("error reading %.250s"), ar->name);
    else
      return NULL;
  }
  if (memcmp(magicbuf, DPKG_AR_MAGIC, sizeof(magicbuf)))
    return NULL;

  rc = fd_read(ar->fd, &arh, sizeof(arh));
  if (rc != sizeof(arh))
    read_fail(rc, ar->name, "ar header");

  dpkg_ar_normalize_name(&arh);

  if (strncmp(arh.ar_name, PARTMAGIC, sizeof(arh.ar_name)) != 0)
    return NULL;
  if (dpkg_ar_member_is_illegal(&arh))
    ohshit(_("file '%.250s' is corrupt - bad magic at end of first header"),
           ar->name);
  thisilen = dpkg_ar_member_get_size(ar, &arh);
  if (thisilen >= readinfobuflen) {
    readinfobuflen = thisilen + 2;
    readinfobuf= m_realloc(readinfobuf,readinfobuflen);
  }
  rc = fd_read(ar->fd, readinfobuf, thisilen + (thisilen & 1));
  if (rc != (ssize_t)(thisilen + (thisilen & 1)))
    read_fail(rc, ar->name, "reading header member");
  if (thisilen & 1) {
    int c = readinfobuf[thisilen + 1];

    if (c != '\n')
      ohshit(_("file '%.250s' is corrupt - bad padding character (code %d)"),
             ar->name, c);
  }
  readinfobuf[thisilen] = '\0';
  if (memchr(readinfobuf,0,thisilen))
    ohshit(_("file '%.250s' is corrupt - nulls in info section"), ar->name);

  ir->filename = ar->name;

  rip= readinfobuf;
  err = deb_version_parse(&ir->fmtversion,
                          nextline(&rip, ar->name, _("format version number")));
  if (err)
    ohshit(_("file '%.250s' has invalid format version: %s"), ar->name, err);
  if (ir->fmtversion.major != 2)
    ohshit(_("file '%.250s' is format version %d.%d; get a newer dpkg-split"),
           ar->name, ir->fmtversion.major, ir->fmtversion.minor);

  ir->package = nfstrsave(nextline(&rip, ar->name, _("package name")));
  ir->version = nfstrsave(nextline(&rip, ar->name, _("package version number")));
  ir->md5sum = nfstrsave(nextline(&rip, ar->name, _("package file MD5 checksum")));
  if (strlen(ir->md5sum) != MD5HASHLEN ||
      strspn(ir->md5sum, "0123456789abcdef") != MD5HASHLEN)
    ohshit(_("file '%.250s' is corrupt - bad MD5 checksum '%.250s'"),
           ar->name, ir->md5sum);

  ir->orglength = parse_intmax(nextline(&rip, ar->name, _("archive total size")),
                               ar->name, _("archive total size"));
  ir->maxpartlen = parse_intmax(nextline(&rip, ar->name, _("archive part offset")),
                                ar->name, _("archive part offset"));

  partnums = nextline(&rip, ar->name, _("archive part numbers"));
  slash= strchr(partnums,'/');
  if (!slash)
    ohshit(_("file '%.250s' is corrupt - no slash between archive part numbers"), ar->name);
  *slash++ = '\0';

  templong = parse_intmax(slash, ar->name, _("number of archive parts"));
  if (templong <= 0 || templong > INT_MAX)
    ohshit(_("file '%.250s' is corrupt - bad number of archive parts"), ar->name);
  ir->maxpartn= templong;
  templong = parse_intmax(partnums, ar->name, _("archive parts number"));
  if (templong <= 0 || templong > ir->maxpartn)
    ohshit(_("file '%.250s' is corrupt - bad archive part number"), ar->name);
  ir->thispartn= templong;

  /* If the package was created with dpkg 1.16.1 or later it will include
   * the architecture. */
  if (*rip != '\0')
    ir->arch = nfstrsave(nextline(&rip, ar->name, _("package architecture")));
  else
    ir->arch = NULL;

  rc = fd_read(ar->fd, &arh, sizeof(arh));
  if (rc != sizeof(arh))
    read_fail(rc, ar->name, "reading data part member ar header");

  dpkg_ar_normalize_name(&arh);

  if (dpkg_ar_member_is_illegal(&arh))
    ohshit(_("file '%.250s' is corrupt - bad magic at end of second header"),
           ar->name);
  if (strncmp(arh.ar_name,"data",4))
    ohshit(_("file '%.250s' is corrupt - second member is not data member"),
           ar->name);

  ir->thispartlen = dpkg_ar_member_get_size(ar, &arh);
  ir->thispartoffset= (ir->thispartn-1)*ir->maxpartlen;

  if (ir->maxpartn != (ir->orglength+ir->maxpartlen-1)/ir->maxpartlen)
    ohshit(_("file '%.250s' is corrupt - wrong number of parts for quoted sizes"),
           ar->name);
  if (ir->thispartlen !=
      (ir->thispartn == ir->maxpartn
       ? ir->orglength - ir->thispartoffset : ir->maxpartlen))
    ohshit(_("file '%.250s' is corrupt - size is wrong for quoted part number"),
           ar->name);

  ir->filesize = (strlen(DPKG_AR_MAGIC) +
                  sizeof(arh) + thisilen + (thisilen & 1) +
                  sizeof(arh) + ir->thispartlen + (ir->thispartlen & 1));

  if (S_ISREG(ar->mode)) {
    /* Don't do this check if it's coming from a pipe or something.  It's
     * only an extra sanity check anyway. */
    if (ar->size < ir->filesize)
      ohshit(_("file '%.250s' is corrupt - too short"), ar->name);
  }

  ir->headerlen = strlen(DPKG_AR_MAGIC) +
                  sizeof(arh) + thisilen + (thisilen & 1) + sizeof(arh);

  return ir;
}