os2.c

压缩算法的源代码

#else /* !SFX */

DIR *opendir(char *name)
{
  struct stat statb;
  DIR *dirp;
  char c;
  char *s;
  struct _dircontents *dp;
  char nbuf[MAXPATHLEN + 1];
  int len;

  strcpy(nbuf, name);
  if ((len = strlen(nbuf)) == 0)
    return NULL;

  if ( ((c = nbuf[len - 1]) == '\\' || c == '/') && (len > 1) )
  {
    nbuf[len - 1] = 0;
    --len;

    if ( nbuf[len - 1] == ':' )
    {
      strcpy(nbuf+len, "\\.");
      len += 2;
    }
  }
  else
    if ( nbuf[len - 1] == ':' )
    {
      strcpy(nbuf+len, ".");
      ++len;
    }

  /* GRR:  Borland and Watcom C return non-zero on wildcards... < 0 ? */
  if (stat(nbuf, &statb) < 0 || (statb.st_mode & S_IFMT) != S_IFDIR)
  {
    Trace((stderr, "opendir:  stat(%s) returns negative or not directory\n",
      nbuf));
    return NULL;
  }

  if ( (dirp = malloc(sizeof(DIR))) == NULL )
    return NULL;

  if ( nbuf[len - 1] == '.' && (len == 1 || nbuf[len - 2] != '.') )
    strcpy(nbuf+len-1, "*");
  else
    if ( ((c = nbuf[len - 1]) == '\\' || c == '/') && (len == 1) )
      strcpy(nbuf+len, "*");
    else
      strcpy(nbuf+len, "\\*");

  /* len is no longer correct (but no longer needed) */
  Trace((stderr, "opendir:  nbuf = [%s]\n", nbuf));

  dirp -> dd_loc = 0;
  dirp -> dd_contents = dirp -> dd_cp = NULL;

  if ((s = getdirent(nbuf)) == NULL)
    return dirp;

  do
  {
    if (((dp = malloc(sizeof(struct _dircontents))) == NULL) ||
        ((dp -> _d_entry = malloc(strlen(s) + 1)) == NULL)      )
    {
      if (dp)
        free(dp);
      free_dircontents(dirp -> dd_contents);

      return NULL;
    }

    if (dirp -> dd_contents)
    {
      dirp -> dd_cp -> _d_next = dp;
      dirp -> dd_cp = dirp -> dd_cp -> _d_next;
    }
    else
      dirp -> dd_contents = dirp -> dd_cp = dp;

    strcpy(dp -> _d_entry, s);
    dp -> _d_next = NULL;

    dp -> _d_size = find.cbFile;
    dp -> _d_mode = find.attrFile;
    dp -> _d_time = *(unsigned *) &(find.ftimeLastWrite);
    dp -> _d_date = *(unsigned *) &(find.fdateLastWrite);
  }
  while ((s = getdirent(NULL)) != NULL);

  dirp -> dd_cp = dirp -> dd_contents;

  return dirp;
}


void closedir(DIR * dirp)
{
  free_dircontents(dirp -> dd_contents);
  free(dirp);
}


struct direct *readdir(DIR * dirp)
{
  static struct direct dp;

  if (dirp -> dd_cp == NULL)
    return NULL;

  dp.d_namlen = dp.d_reclen =
    strlen(strcpy(dp.d_name, dirp -> dd_cp -> _d_entry));

  dp.d_ino = 0;

  dp.d_size = dirp -> dd_cp -> _d_size;
  dp.d_mode = dirp -> dd_cp -> _d_mode;
  dp.d_time = dirp -> dd_cp -> _d_time;
  dp.d_date = dirp -> dd_cp -> _d_date;

  dirp -> dd_cp = dirp -> dd_cp -> _d_next;
  dirp -> dd_loc++;

  return &dp;
}



#if 0  /* not used in unzip; retained for possibly future use */

void seekdir(DIR * dirp, long off)
{
  long i = off;
  struct _dircontents *dp;

  if (off >= 0)
  {
    for (dp = dirp -> dd_contents; --i >= 0 && dp; dp = dp -> _d_next);

    dirp -> dd_loc = off - (i + 1);
    dirp -> dd_cp = dp;
  }
}


long telldir(DIR * dirp)
{
  return dirp -> dd_loc;
}

#endif /* 0 */



static void free_dircontents(struct _dircontents * dp)
{
  struct _dircontents *odp;

  while (dp)
  {
    if (dp -> _d_entry)
      free(dp -> _d_entry);

    dp = (odp = dp) -> _d_next;
    free(odp);
  }
}


static char *getdirent(char *dir)
{
  int done;
  static int lower;

  if (dir != NULL)
  {                                    /* get first entry */
    hdir = HDIR_SYSTEM;
    count = 1;
    done = DosFindFirst(dir, &hdir, attributes, &find, sizeof(find), &count);
    lower = IsFileSystemFAT(dir);
  }
  else                                 /* get next entry */
    done = DosFindNext(hdir, &find, sizeof(find), &count);

  if (done == 0)
  {
    if ( lower )
      StringLower(find.achName);
    return find.achName;
  }
  else
  {
    DosFindClose(hdir);
    return NULL;
  }
}



int IsFileSystemFAT(char *dir)     /* FAT / HPFS detection */
{
  static USHORT nLastDrive=(USHORT)(-1), nResult;
  ULONG lMap;
  BYTE bData[64], bName[3];
#ifdef __32BIT__
  ULONG nDrive, cbData;
  PFSQBUFFER2 pData = (PFSQBUFFER2) bData;
#else
  USHORT nDrive, cbData;
  PFSQBUFFER pData = (PFSQBUFFER) bData;
#endif

  if ( _osmode == DOS_MODE )
    return TRUE;
  else
  {
    /* We separate FAT and HPFS+other file systems here.
       at the moment I consider other systems to be similar to HPFS,
       i.e. support long file names and case sensitive */

    if ( isalpha(dir[0]) && (dir[1] == ':') )
      nDrive = toupper(dir[0]) - '@';
    else
      DosQueryCurrentDisk(&nDrive, &lMap);

    if ( nDrive == nLastDrive )
      return nResult;

    bName[0] = (char) (nDrive + '@');
    bName[1] = ':';
    bName[2] = 0;

    nLastDrive = nDrive;
    cbData = sizeof(bData);

    if ( !DosQueryFSAttach(bName, 0, FSAIL_QUERYNAME, (PVOID) pData, &cbData) )
      nResult = !strcmp(pData -> szFSDName + pData -> cbName, "FAT");
    else
      nResult = FALSE;

    /* End of this ugly code */
    return nResult;
  }
} /* end function IsFileSystemFAT() */





/************************/
/*  Function do_wild()  */
/************************/

char *do_wild(wildspec)
    char *wildspec;         /* only used first time on a given dir */
{
    static DIR *dir = NULL;
    static char *dirname, *wildname, matchname[FILNAMSIZ];
    static int firstcall=TRUE, have_dirname, dirnamelen;
    struct direct *file;


    /* Even when we're just returning wildspec, we *always* do so in
     * matchname[]--calling routine is allowed to append four characters
     * to the returned string, and wildspec may be a pointer to argv[].
     */
    if (firstcall) {        /* first call:  must initialize everything */
        firstcall = FALSE;

        /* break the wildspec into a directory part and a wildcard filename */
        if ((wildname = strrchr(wildspec, '/')) == NULL &&
            (wildname = strrchr(wildspec, ':')) == NULL) {
            dirname = ".";
            dirnamelen = 1;
            have_dirname = FALSE;
            wildname = wildspec;
        } else {
            ++wildname;     /* point at character after '/' or ':' */
            dirnamelen = wildname - wildspec;
            if ((dirname = (char *)malloc(dirnamelen+1)) == NULL) {
                FPRINTF(stderr, "warning:  can't allocate wildcard buffers\n");
                strcpy(matchname, wildspec);
                return matchname;   /* but maybe filespec was not a wildcard */
            }
            strncpy(dirname, wildspec, dirnamelen);
            dirname[dirnamelen] = '\0';   /* terminate for strcpy below */
            have_dirname = TRUE;
        }
        Trace((stderr, "do_wild:  dirname = [%s]\n", dirname));

        if ((dir = opendir(dirname)) != NULL) {
            while ((file = readdir(dir)) != NULL) {
                Trace((stderr, "do_wild:  readdir returns %s\n", file->d_name));
                if (match(file->d_name, wildname, 1)) {  /* 1 == ignore case */
                    Trace((stderr, "do_wild:  match() succeeds\n"));
                    if (have_dirname) {
                        strcpy(matchname, dirname);
                        strcpy(matchname+dirnamelen, file->d_name);
                    } else
                        strcpy(matchname, file->d_name);
                    return matchname;
                }
            }
            /* if we get to here directory is exhausted, so close it */
            closedir(dir);
            dir = NULL;
        }
        Trace((stderr, "do_wild:  opendir(%s) returns NULL\n", dirname));

        /* return the raw wildspec in case that works (e.g., directory not
         * searchable, but filespec was not wild and file is readable) */
        strcpy(matchname, wildspec);
        return matchname;
    }

    /* last time through, might have failed opendir but returned raw wildspec */
    if (dir == NULL) {
        firstcall = TRUE;  /* nothing left to try--reset for new wildspec */
        if (have_dirname)
            free(dirname);
        return (char *)NULL;
    }

    /* If we've gotten this far, we've read and matched at least one entry
     * successfully (in a previous call), so dirname has been copied into
     * matchname already.
     */
    while ((file = readdir(dir)) != NULL)
        if (match(file->d_name, wildname, 1)) {   /* 1 == ignore case */
            if (have_dirname) {
                /* strcpy(matchname, dirname); */
                strcpy(matchname+dirnamelen, file->d_name);
            } else
                strcpy(matchname, file->d_name);
            return matchname;
        }

    closedir(dir);     /* have read at least one dir entry; nothing left */
    dir = NULL;
    firstcall = TRUE;  /* reset for new wildspec */
    if (have_dirname)
        free(dirname);
    return (char *)NULL;

} /* end function do_wild() */

#endif /* !SFX */





/************************/
/*  Function mapattr()  */
/************************/

int mapattr()
{
    /* set archive bit (file is not backed up): */
    pInfo->file_attr = (unsigned)(crec.external_file_attributes | 32) & 0xff;
    return 0;
}





/************************/
/*  Function mapname()  */
/************************/

/*
 * There are presently two possibilities in OS/2:  the output filesystem is
 * FAT, or it is HPFS.  If the former, we need to map to FAT, obviously, but
 * we *also* must map to HPFS and store that version of the name in extended
 * attributes.  Either way, we need to map to HPFS, so the main mapname
 * routine does that.  In the case that the output file system is FAT, an
 * extra filename-mapping routine is called in checkdir().  While it should
 * be possible to determine the filesystem immediately upon entry to mapname(),
 * it is conceivable that the DOS APPEND utility could be added to OS/2 some-
 * day, allowing a FAT directory to be APPENDed to an HPFS drive/path.  There-
 * fore we simply check the filesystem at each path component.
 *
 * Note that when alternative IFS's become available/popular, everything will
 * become immensely more complicated.  For example, a Minix filesystem would
 * have limited filename lengths like FAT but no extended attributes in which
 * to store the longer versions of the names.  A BSD Unix filesystem would
 * support paths of length 1024 bytes or more, but it is not clear that FAT
 * EAs would allow such long .LONGNAME fields or that OS/2 would properly
 * restore such fields when moving files from FAT to the new filesystem.
 *
 * GRR:  some or all of the following chars should be checked in either
 *       mapname (HPFS) or map2fat (FAT), depending:  ,=^+'"[]<>|\t&
 */

int mapname(renamed)  /* return 0 if no error, 1 if caution (filename trunc), */
    int renamed;      /* 2 if warning (skip file because dir doesn't exist), */
{                     /* 3 if error (skip file), 10 if no memory (skip file), */
                      /* IZ_VOL_LABEL if can't do vol label, IZ_CREATED_DIR */
    char pathcomp[FILNAMSIZ];    /* path-component buffer */
    char *pp, *cp=(char *)NULL;  /* character pointers */
    char *lastsemi=(char *)NULL; /* pointer to last semi-colon in pathcomp */
    int quote = FALSE;           /* flag:  next char is literal */
    int error = 0;
    register unsigned workch;    /* hold the character being tested */


/*---------------------------------------------------------------------------
    Initialize various pointers and counters and stuff.
  ---------------------------------------------------------------------------*/

    /* can create path as long as not just freshening, or if user told us */
    create_dirs = (!fflag || renamed);

    created_dir = FALSE;        /* not yet */
    renamed_fullpath = FALSE;
    fnlen = strlen(filename);

/* GRR:  for VMS, convert to internal format now or later? or never? */
    if (renamed) {
        cp = filename - 1;      /* point to beginning of renamed name... */
        while (*++cp)
            if (*cp == '\\')    /* convert backslashes to forward */
                *cp = '/';
        cp = filename;
        /* use temporary rootpath if user gave full pathname */
        if (filename[0] == '/') {
            renamed_fullpath = TRUE;
            pathcomp[0] = '/';  /* copy the '/' and terminate */
            pathcomp[1] = '\0';
            ++cp;
        } else if (isalpha(filename[0]) && filename[1] == ':') {
            renamed_fullpath = TRUE;
            pp = pathcomp;
            *pp++ = *cp++;      /* copy the "d:" (+ '/', possibly) */
            *pp++ = *cp++;
            if (*cp == '/')
                *pp++ = *cp++;  /* otherwise add "./"? */
            *pp = '\0';
        }
    }

    /* pathcomp is ignored unless renamed_fullpath is TRUE: */
    if ((error = checkdir(pathcomp, INIT)) != 0)    /* initialize path buffer */
        return error;           /* ...unless no mem or vol label on hard disk */

    *pathcomp = '\0';           /* initialize translation buffer */
    pp = pathcomp;              /* point to translation buffer */
    if (!renamed) {             /* cp already set if renamed */
        if (jflag)              /* junking directories */
/* GRR:  watch out for VMS version... */
            cp = (char *)strrchr(filename, '/');
        if (cp == (char *)NULL)     /* no '/' or not junking dirs */
            cp = filename;          /* point to internal zipfile-member pathname */
        else
            ++cp;                   /* point to start of last component of path */
    }

/*---------------------------------------------------------------------------
    Begin main loop through characters in filename.
  ---------------------------------------------------------------------------*/

    while ((workch = (uch)*cp++) != 0) {

        if (quote) {              /* if character quoted, */
            *pp++ = (char)workch; /*  include it literally */
            quote = FALSE;
        } else
            switch (workch) {