msdos.c

完整的解压zip文件的源码。包含密码功能

#endif /* !SFX */




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

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

} /* end function mapattr() */





/************************/
/*  Function mapname()  */
/************************/
                             /* return 0 if no error, 1 if caution (filename */
int mapname(__G__ renamed)   /*  truncated), 2 if warning (skip file because */
    __GDEF                   /*  dir doesn't exist), 3 if error (skip file), */
    int renamed;             /*  or 10 if out of memory (skip file) */
{                            /*  [also IZ_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 */
#ifdef MAYBE_PLAIN_FAT
    char *last_dot=(char *)NULL;   /* last dot not converted to underscore */
    int dotname = FALSE;           /* path component begins with dot? */
# ifdef USE_LFN
    int use_lfn = USE_LFN;         /* file system supports long filenames? */
# endif
#endif
    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 */
    G.create_dirs = (!uO.fflag || renamed);

    created_dir = FALSE;        /* not yet */
    renamed_fullpath = FALSE;

    if (renamed) {
        cp = G.filename - 1;    /* point to beginning of renamed name... */
        while (*++cp)
            if (*cp == '\\')    /* convert backslashes to forward */
                *cp = '/';
        cp = G.filename;
        /* use temporary rootpath if user gave full pathname */
        if (G.filename[0] == '/') {
            renamed_fullpath = TRUE;
            pathcomp[0] = '/';  /* copy the '/' and terminate */
            pathcomp[1] = '\0';
            ++cp;
        } else if (isalpha(G.filename[0]) && G.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(__G__ pathcomp, INIT)) != 0) /* initialize path buf */
        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 (uO.jflag)           /* junking directories */
            cp = (char *)strrchr(G.filename, '/');
        if (cp == (char *)NULL) /* no '/' or not junking dirs */
            cp = G.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) {

        switch (workch) {
            case '/':             /* can assume -j flag not given */
                *pp = '\0';
#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
                if (!use_lfn)
# endif
                {
                    map2fat(pathcomp, last_dot);   /* 8.3 trunc. (in place) */
                    last_dot = (char *)NULL;
                }
#endif
                if ((error = checkdir(__G__ pathcomp, APPEND_DIR)) > 1)
                    return error;
                pp = pathcomp;    /* reset conversion buffer for next piece */
                lastsemi = (char *)NULL; /* leave directory semi-colons alone */
                break;

            /* drive names are not stored in zipfile, so no colons allowed;
             *  no brackets or most other punctuation either (all of which
             *  can appear in Unix-created archives; backslash is particularly
             *  bad unless all necessary directories exist) */
#ifdef MAYBE_PLAIN_FAT
            case '[':          /* these punctuation characters forbidden */
            case ']':          /*  only on plain FAT file systems */
            case '+':
            case ',':
            case '=':
# ifdef USE_LFN
                if (use_lfn)
                    *pp++ = (char)workch;
                else
                    *pp++ = '_';
                break;
# endif
#endif
            case ':':           /* special shell characters of command.com */
            case '\\':          /*  (device and directory limiters, wildcard */
            case '"':           /*  characters, stdin/stdout redirection and */
            case '<':           /*  pipe indicators and the quote sign) are */
            case '>':           /*  never allowed in filenames on (V)FAT */
            case '|':
            case '*':
            case '?':
                *pp++ = '_';
                break;

#ifdef MAYBE_PLAIN_FAT
            case '.':
# ifdef USE_LFN
                if (use_lfn) {
                    *pp++ = (char)workch;
                    break;
                }
# endif
                if (pp == pathcomp) {     /* nothing appended yet... */
                    if (*cp == '/') {     /* don't bother appending a "./" */
                        ++cp;             /*  component to the path:  skip */
                        break;            /*  to next char after the '/' */
                    } else if (*cp == '.' && cp[1] == '/') {   /* "../" */
                        *pp++ = '.';      /* add first dot, unchanged... */
                        ++cp;             /* skip second dot, since it will */
                    } else {              /*  be "added" at end of if-block */
                        *pp++ = '_';      /* FAT doesn't allow null filename */
                        dotname = TRUE;   /*  bodies, so map .exrc -> _.exrc */
                    }                     /*  (extra '_' now, "dot" below) */
                } else if (dotname) {     /* found a second dot, but still */
                    dotname = FALSE;      /*  have extra leading underscore: */
                    *pp = '\0';           /*  remove it by shifting chars */
                    pp = pathcomp + 1;    /*  left one space (e.g., .p1.p2: */
                    while (pp[1]) {       /*  __p1 -> _p1_p2 -> _p1.p2 when */
                        *pp = pp[1];      /*  finished) [opt.:  since first */
                        ++pp;             /*  two chars are same, can start */
                    }                     /*  shifting at second position] */
                }
                last_dot = pp;    /* point at last dot so far... */
                *pp++ = '_';      /* convert dot to underscore for now */
                break;
#endif /* MAYBE_PLAIN_FAT */

            case ';':             /* start of VMS version? */
                lastsemi = pp;
#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
                if (use_lfn)
                    *pp++ = ';';  /* keep for now; remove VMS ";##" later */
# endif
#else
                *pp++ = ';';      /* keep for now; remove VMS ";##" later */
#endif
                break;

#ifdef MAYBE_PLAIN_FAT
            case ' ':                      /* change spaces to underscores */
# ifdef USE_LFN
                if (!use_lfn && uO.sflag)  /*  only if requested and NO lfn! */
# else
                if (uO.sflag)              /*  only if requested */
# endif
                    *pp++ = '_';
                else
                    *pp++ = (char)workch;
                break;
#endif /* MAYBE_PLAIN_FAT */

            default:
                /* allow ASCII 255 and European characters in filenames: */
                if (isprint(workch) || workch >= 127)
                    *pp++ = (char)workch;

        } /* end switch */
    } /* end while loop */

    *pp = '\0';                   /* done with pathcomp:  terminate it */

    /* if not saving them, remove VMS version numbers (appended ";###") */
    if (!uO.V_flag && lastsemi) {
#ifndef MAYBE_PLAIN_FAT
        pp = lastsemi + 1;
#else
# ifdef USE_LFN
        if (use_lfn)
            pp = lastsemi + 1;
        else
            pp = lastsemi;        /* semi-colon was omitted:  expect all #'s */
# else
        pp = lastsemi;            /* semi-colon was omitted:  expect all #'s */
# endif
#endif
        while (isdigit((uch)(*pp)))
            ++pp;
        if (*pp == '\0')          /* only digits between ';' and end:  nuke */
            *lastsemi = '\0';
    }

    if (G.pInfo->vollabel) {
        if (strlen(pathcomp) > 11)
            pathcomp[11] = '\0';
    }

#ifdef MAYBE_PLAIN_FAT
# ifdef USE_LFN
    if (!use_lfn)
        map2fat(pathcomp, last_dot);  /* 8.3 truncation (in place) */
# else
    map2fat(pathcomp, last_dot);  /* 8.3 truncation (in place) */
# endif
#endif

/*---------------------------------------------------------------------------
    Report if directory was created (and no file to create:  filename ended
    in '/'), check name to be sure it exists, and combine path and name be-
    fore exiting.
  ---------------------------------------------------------------------------*/

    if (G.filename[strlen(G.filename) - 1] == '/') {
        checkdir(__G__ G.filename, GETPATH);
        if (created_dir) {
            if (QCOND2) {
                Info(slide, 0, ((char *)slide, LoadFarString(Creating),
                  FnFilter1(G.filename)));
            }

            /* set file attributes: */
            z_dos_chmod(__G__ G.filename, G.pInfo->file_attr);

            return IZ_CREATED_DIR;   /* set dir time (note trailing '/') */
        } else if (uO.overwrite_all) {
            /* overwrite attributes of existing directory on user's request */

            /* set file attributes: */
            z_dos_chmod(__G__ G.filename, G.pInfo->file_attr);
        }
        return 2;   /* dir existed already; don't look for data to extract */
    }

    if (*pathcomp == '\0') {
        Info(slide, 1, ((char *)slide, LoadFarString(ConversionFailed),
          FnFilter1(G.filename)));
        return 3;
    }

    checkdir(__G__ pathcomp, APPEND_NAME);  /* returns 1 if truncated: care? */
    checkdir(__G__ G.filename, GETPATH);

    if (G.pInfo->vollabel) {    /* set the volume label now */
        if (QCOND2)
            Info(slide, 0, ((char *)slide, LoadFarString(Labelling),
              (nLabelDrive + 'a' - 1),
              FnFilter1(G.filename)));
        if (volumelabel(G.filename)) {
            Info(slide, 1, ((char *)slide, LoadFarString(ErrSetVolLabel)));
            return 3;
        }
        return 2;   /* success:  skip the "extraction" quietly */
    }

    return error;

} /* end function mapname() */





#ifdef MAYBE_PLAIN_FAT

/**********************/
/* Function map2fat() */
/**********************/

static void map2fat(pathcomp, last_dot)
    char *pathcomp, *last_dot;
{
    char *pEnd = pathcomp + strlen(pathcomp);

/*---------------------------------------------------------------------------
    Case 1:  filename has no dot, so figure out if we should add one.  Note
    that the algorithm does not try to get too fancy:  if there are no dots
    already, the name either gets truncated at 8 characters or the last un-
    derscore is converted to a dot (only if more characters are saved that
    way).  In no case is a dot inserted between existing characters.

              GRR:  have problem if filename is volume label??

  ---------------------------------------------------------------------------*/

    if (last_dot == (char *)NULL) {   /* no dots:  check for underscores... */
        char *plu = strrchr(pathcomp, '_');   /* pointer to last underscore */

        if (plu == (char *)NULL) {  /* no dots, no underscores:  truncate at */
            if (pEnd > pathcomp+8)  /* 8 chars (could insert '.' and keep 11) */
                *(pEnd = pathcomp+8) = '\0';
        } else if (MIN(plu - pathcomp, 8) + MIN(pEnd - plu - 1, 3) > 8) {
            last_dot = plu;       /* be lazy:  drop through to next if-block */
        } else if ((pEnd - pathcomp) > 8)    /* more fits into just basename */
            pathcomp[8] = '\0';    /* than if convert last underscore to dot */
        /* else whole thing fits into 8 chars or less:  no change */
    }

/*---------------------------------------------------------------------------
    Case 2:  filename has dot in it, so truncate first half at 8 chars (shift
    extension if necessary) and second half at three.
  ---------------------------------------------------------------------------*/

    if (last_dot != (char *)NULL) {   /* one dot (or two, in the case of */
        *last_dot = '.';              /*  "..") is OK:  put it back in */

        if ((last_dot - pathcomp) > 8) {
            char *p, *q;
            int i;

            p = last_dot;
            q = last_dot = pathcomp + 8;
            for (i = 0;  (i < 4) && *p;  ++i)  /* too many chars in basename: */
                *q++ = *p++;                   /*  shift extension left and */
            *q = '\0';                         /*  truncate/terminate it */
        } else if ((pEnd - last_dot) > 4)
            last_dot[4] = '\0';                /* too many chars in extension */
        /* else filename is fine as is:  no change */

        if ((last_dot - pathcomp) > 0 && last_dot[-1] == ' ')
            last_dot[-1] = '_';                /* NO blank in front of '.'! */
    }
} /* end function map2fat() */

#endif /* MAYBE_PLAIN_FAT */