amiga.c

压缩解压,是unzip540的升级,这个外国网站摘来的源码,是evb编写.

#ifndef OLD_AMIGA_RENAMED
    G.renamed_fullpath = (renamed &&
                          (*G.filename == '/' || *G.filename == ':'));
#else
    /* supress G.rootpath even when user gave a relative pathname */
# if 1
    G.renamed_fullpath = (renamed && strpbrk(G.filename, ":/");
# else
    G.renamed_fullpath = (renamed &&
                          (strchr(G.filename, ':') || strchr(G.filename, '/')));
# endif
#endif

    if (checkdir(__G__ (char *)NULL, INIT) == MPN_NOMEM)
        return MPN_NOMEM;       /* initialize path buffer, unless no memory */

    *pathcomp = '\0';           /* initialize translation buffer */
    pp = pathcomp;              /* point to translation buffer */
    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';
                if (strcmp(pathcomp, ".") == 0) {
                    /* don't bother appending "./" to the path */
                    *pathcomp = '\0';
                } else if (!uO.ddotflag && strcmp(pathcomp, "..") == 0) {
                    /* "../" dir traversal detected, skip over it */
                    *pathcomp = '\0';
                    killed_ddot = TRUE;     /* set "show message" flag */
                }
                /* when path component is not empty, append it now */
                if (*pathcomp != '\0' &&
                    ((error = checkdir(__G__ pathcomp, APPEND_DIR))
                     & MPN_MASK) > MPN_INF_TRUNC)
                    return error;
                pp = pathcomp;    /* reset conversion buffer for next piece */
                lastsemi = (char *)NULL; /* leave direct. semi-colons alone */
                break;

            case ';':             /* VMS version (or DEC-20 attrib?) */
                lastsemi = pp;         /* keep for now; remove VMS ";##" */
                *pp++ = (char)workch;  /*  later, if requested */
                break;

            default:
                /* allow ISO European characters in filenames: */
                if (isprint(workch) || (160 <= workch && workch <= 255))
                    *pp++ = (char)workch;
        } /* end switch */

    } /* end while loop */

    /* Show warning when stripping insecure "parent dir" path components */
    if (killed_ddot && QCOND2) {
        Info(slide, 0, ((char *)slide,
          "warning:  skipped \"../\" path component(s) in %s\n",
          FnFilter1(G.filename)));
        if (!(error & ~MPN_MASK))
            error = (error & MPN_MASK) | PK_WARN;
    }

/*---------------------------------------------------------------------------
    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 (G.created_dir) {
            if (QCOND2) {
                Info(slide, 0, ((char *)slide, "   creating: %s\n",
                  FnFilter1(G.filename)));
            }
            /* set dir time (note trailing '/') */
            return (error & ~MPN_MASK) | MPN_CREATED_DIR;
        }
        /* dir existed already; don't look for data to extract */
        return (error & ~MPN_MASK) | MPN_INF_SKIP;
    }

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

    /* if not saving them, remove VMS version numbers (appended ";###") */
    if (!uO.V_flag && lastsemi) {
        pp = lastsemi + 1;
        while (isdigit((uch)(*pp)))
            ++pp;
        if (*pp == '\0')          /* only digits between ';' and end:  nuke */
            *lastsemi = '\0';
    }

    if (*pathcomp == '\0') {
        Info(slide, 1, ((char *)slide, "mapname:  conversion of %s failed\n",
          FnFilter1(G.filename)));
        return (error & ~MPN_MASK) | MPN_ERR_SKIP;
    }

    error = (error & ~MPN_MASK) | checkdir(__G__ pathcomp, APPEND_NAME);
    if ((error & MPN_MASK) == MPN_INF_TRUNC) {
        /* GRR:  OK if truncated here:  warn and continue */
        /* (warn in checkdir?) */
    }
    checkdir(__G__ G.filename, GETPATH);

    return error;

} /* end function mapname() */




/***********************/
/* Function checkdir() */
/***********************/

int checkdir(__G__ pathcomp, flag)
    __GDEF
    char *pathcomp;
    int flag;
/*
 * returns:
 *  MPN_OK          - no problem detected
 *  MPN_INF_TRUNC   - (on APPEND_NAME) truncated filename
 *  MPN_INF_SKIP    - path doesn't exist, not allowed to create
 *  MPN_ERR_SKIP    - path doesn't exist, tried to create and failed; or path
 *                    exists and is not a directory, but is supposed to be
 *  MPN_ERR_TOOLONG - path is too long
 *  MPN_NOMEM       - can't allocate memory for filename buffers
 */
{
/* these statics are now declared in SYSTEM_SPECIFIC_GLOBALS in amiga.h: */
/*  static int rootlen = 0; */   /* length of rootpath */
/*  static char *rootpath;  */   /* user's "extract-to" directory */
/*  static char *buildpath; */   /* full path (so far) to extracted file */
/*  static char *end;       */   /* pointer to end of buildpath ('\0') */

#   define FN_MASK   7
#   define FUNCTION  (flag & FN_MASK)


/*---------------------------------------------------------------------------
    APPEND_DIR:  append the path component to the path being built and check
    for its existence.  If doesn't exist and we are creating directories, do
    so for this one; else signal success or error as appropriate.
  ---------------------------------------------------------------------------*/

/* GRR:  check path length after each segment:  warn about truncation */

    if (FUNCTION == APPEND_DIR) {
        int too_long = FALSE;

        Trace((stderr, "appending dir segment [%s]\n", FnFilter1(pathcomp)));
        while ((*G.build_end = *pathcomp++) != '\0')
            ++G.build_end;
        /* Truncate components over 30 chars? Nah, the filesystem handles it. */
        if ((G.build_end-G.buildpath) > FILNAMSIZ-3)       /* room for "/a\0" */
            too_long = TRUE;                    /* check if extracting dir? */
        if (SSTAT(G.buildpath, &G.statbuf)) {   /* path doesn't exist */
            if (!G.create_dirs) { /* told not to create (freshening) */
                free(G.buildpath);
                return MPN_INF_SKIP;    /* path doesn't exist: nothing to do */
            }
            if (too_long) {
                Info(slide, 1, ((char *)slide,
                  "checkdir error:  path too long: %s\n",
                  FnFilter1(G.buildpath)));
                free(G.buildpath);
                /* no room for filenames:  fatal */
                return MPN_ERR_TOOLONG;
            }
            if (MKDIR(G.buildpath, 0777) == -1) {   /* create the directory */
                Info(slide, 1, ((char *)slide,
                  "checkdir error:  cannot create %s\n\
                 unable to process %s.\n",
                  FnFilter2(G.buildpath), FnFilter1(G.filename)));
                free(G.buildpath);
                /* path didn't exist, tried to create, failed */
                return MPN_ERR_SKIP;
            }
            G.created_dir = TRUE;
        } else if (!S_ISDIR(G.statbuf.st_mode)) {
            Info(slide, 1, ((char *)slide,
              "checkdir error:  %s exists but is not directory\n\
                 unable to process %s.\n",
              FnFilter2(G.buildpath), FnFilter1(G.filename)));
            free(G.buildpath);
            /* path existed but wasn't dir */
            return MPN_ERR_SKIP;
        }
        if (too_long) {
            Info(slide, 1, ((char *)slide,
              "checkdir error:  path too long: %s\n", FnFilter1(G.buildpath)));
            free(G.buildpath);
            /* no room for filenames:  fatal */
            return MPN_ERR_TOOLONG;
        }
        *G.build_end++ = '/';
        *G.build_end = '\0';
        Trace((stderr, "buildpath now = [%s]\n", FnFilter1(G.buildpath)));
        return MPN_OK;

    } /* end if (FUNCTION == APPEND_DIR) */

/*---------------------------------------------------------------------------
    GETPATH:  copy full path to the string pointed at by pathcomp, and free
    G.buildpath.  Not our responsibility to worry whether pathcomp has room.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == GETPATH) {
        strcpy(pathcomp, G.buildpath);
        Trace((stderr, "getting and freeing path [%s]\n",
          FnFilter1(pathcomp)));
        free(G.buildpath);
        G.buildpath = G.build_end = (char *)NULL;
        return MPN_OK;
    }

/*---------------------------------------------------------------------------
    APPEND_NAME:  assume the path component is the filename; append it and
    return without checking for existence.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == APPEND_NAME) {
        Trace((stderr, "appending filename [%s]\n", FnFilter1(pathcomp)));
        while ((*G.build_end = *pathcomp++) != '\0') {
            ++G.build_end;
            if ((G.build_end-G.buildpath) >= FILNAMSIZ) {
                *--G.build_end = '\0';
                Info(slide, 0x201, ((char *)slide,
                  "checkdir warning:  path too long; truncating\n\
                   %s\n                -> %s\n",
                  FnFilter1(G.filename), FnFilter2(G.buildpath)));
                return MPN_INF_TRUNC;   /* filename truncated */
            }
        }
        Trace((stderr, "buildpath now = [%s]\n", FnFilter1(G.buildpath)));
        /* could check for existence here, prompt for new name... */
        return MPN_OK;
    }

/*---------------------------------------------------------------------------
    INIT:  allocate and initialize buffer space for the file currently being
    extracted.  If file was renamed with an absolute path, don't prepend the
    extract-to path.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == INIT) {
        Trace((stderr, "initializing buildpath to "));
        if ((G.buildpath = (char *)malloc(strlen(G.filename)+G.rootlen+1))
            == (char *)NULL)
            return MPN_NOMEM;
        if ((G.rootlen > 0) && !G.renamed_fullpath) {
            strcpy(G.buildpath, G.rootpath);
            G.build_end = G.buildpath + G.rootlen;
        } else {
            *G.buildpath = '\0';
            G.build_end = G.buildpath;
        }
        Trace((stderr, "[%s]\n", FnFilter1(G.buildpath)));
        return MPN_OK;
    }

/*---------------------------------------------------------------------------
    ROOT:  if appropriate, store the path in G.rootpath and create it if
    necessary; else assume it's a zipfile member and return.  This path
    segment gets used in extracting all members from every zipfile specified
    on the command line.
  ---------------------------------------------------------------------------*/

#if (!defined(SFX) || defined(SFX_EXDIR))
    if (FUNCTION == ROOT) {
        Trace((stderr, "initializing root path to [%s]\n",
          FnFilter1(pathcomp)));
        if (pathcomp == (char *)NULL) {
            G.rootlen = 0;
            return MPN_OK;
        }
        if (G.rootlen > 0)      /* rootpath was already set, nothing to do */
            return MPN_OK;
        if ((G.rootlen = strlen(pathcomp)) > 0) {
            if (stat(pathcomp, &G.statbuf) || !S_ISDIR(G.statbuf.st_mode)) {
                /* path does not exist */
                if (!G.create_dirs) {
                    G.rootlen = 0;
                    /* skip (or treat as stored file) */
                    return MPN_INF_SKIP;
                }
                /* create the directory (could add loop here scanning pathcomp
                 * to create more than one level, but why really necessary?) */
                if (MKDIR(pathcomp, 0777) == -1) {
                    Info(slide, 1, ((char *)slide,
                      "checkdir:  cannot create extraction directory: %s\n",
                      FnFilter1(pathcomp)));
                    G.rootlen = 0;
                    /* path didn't exist, tried to create, and failed: */
                    /* file exists, or 2+ subdir levels required */
                    return MPN_ERR_SKIP;
                }
            }
            if ((G.rootpath = (char *)malloc(G.rootlen+2)) == NULL) {
                G.rootlen = 0;
                return MPN_NOMEM;
            }
            strcpy(G.rootpath, pathcomp);
            if (G.rootpath[G.rootlen-1] != ':' && G.rootpath[G.rootlen-1] != '/')
                G.rootpath[G.rootlen++] = '/';
            G.rootpath[G.rootlen] = '\0';
            Trace((stderr, "rootpath now = [%s]\n", FnFilter1(G.rootpath)));
        }
        return MPN_OK;
    }
#endif /* !SFX || SFX_EXDIR */

/*---------------------------------------------------------------------------
    END:  free G.rootpath, immediately prior to program exit.
  ---------------------------------------------------------------------------*/

    if (FUNCTION == END) {
        Trace((stderr, "freeing rootpath\n"));
        if (G.rootlen > 0) {
            free(G.rootpath);
            G.rootlen = 0;
        }
        return MPN_OK;
    }

    return MPN_INVALID; /* should never reach */

} /* end function checkdir() */