acorn.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.

/*---------------------------------------------------------------------------
    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.
  ---------------------------------------------------------------------------*/

/* GRR:  for VMS and TOPS-20, add up to 13 to strlen */

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

/*---------------------------------------------------------------------------
    ROOT:  if appropriate, store the path in 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) {
            rootlen = 0;
            return MPN_OK;
        }
        if (rootlen > 0)        /* rootpath was already set, nothing to do */
            return MPN_OK;
        if ((rootlen = strlen(pathcomp)) > 0) {
            char *tmproot;

            if ((tmproot = (char *)malloc(rootlen+2)) == (char *)NULL) {
                rootlen = 0;
                return MPN_NOMEM;
            }
            strcpy(tmproot, pathcomp);
            if (tmproot[rootlen-1] == '.') {    /****** was '/' ********/
                tmproot[--rootlen] = '\0';
            }
            if (rootlen > 0 && (SSTAT(tmproot, &G.statbuf) ||
                                !S_ISDIR(G.statbuf.st_mode)))
            {   /* path does not exist */
                if (!G.create_dirs /* || isshexp(tmproot) */ ) {
                    free(tmproot);
                    rootlen = 0;
                    /* skip (or treat as stored file) */
                    return MPN_INF_SKIP;
                }
                /* create the directory (could add loop here scanning tmproot
                 * to create more than one level, but why really necessary?) */
                if (mkdir(tmproot, 0777) == -1) {
                    Info(slide, 1, ((char *)slide,
                      "checkdir:  cannot create extraction directory: %s\n",
                      FnFilter1(tmproot)));
                    free(tmproot);
                    rootlen = 0;
                    /* path didn't exist, tried to create, and failed: */
                    /* file exists, or 2+ subdir levels required */
                    return MPN_ERR_SKIP;
                }
            }
            tmproot[rootlen++] = '.';   /*********** was '/' *************/
            tmproot[rootlen] = '\0';
            if ((rootpath = (char *)realloc(tmproot, rootlen+1)) == NULL) {
                free(tmproot);
                rootlen = 0;
                return MPN_NOMEM;
            }
            Trace((stderr, "rootpath now = [%s]\n", FnFilter1(rootpath)));
        }
        return MPN_OK;
    }
#endif /* !SFX || SFX_EXDIR */

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

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

    return MPN_INVALID; /* should never reach */

} /* end function checkdir() */





/********************/
/* Function mkdir() */
/********************/

int mkdir(path, mode)
    const char *path;
    int mode;   /* ignored */
/*
 * returns:   0 - successful
 *           -1 - failed (errno not set, however)
 */
{
    return (SWI_OS_File_8((char *)path) == NULL)? 0 : -1;
}




/*********************************/
/* extra_field-related functions */
/*********************************/

static void setRISCOSexfield(ZCONST char *path, ZCONST void *ef_spark)
{
  if (ef_spark!=NULL) {
    extra_block *block=(extra_block *)ef_spark;
    SWI_OS_File_1((char *)path,block->loadaddr,block->execaddr,block->attr);
  }
}

#ifdef DEBUG
static void printRISCOSexfield(int isdir, ZCONST void *extra_field)
{
 extra_block *block=(extra_block *)extra_field;
 printf("\n  This file has RISC OS file informations in the local extra field.\n");

 if (isdir) {
/*   I prefer not to print this string... should change later... */
/*   printf("  The file is a directory.\n");*/
 } else if ((block->loadaddr & 0xFFF00000) != 0xFFF00000) {
   printf("  Load address: %.8X\n",block->loadaddr);
   printf("  Exec address: %.8X\n",block->execaddr);
 } else {
   /************* should change this to use OS_FSControl 18 to get filetype string ************/
   char tmpstr[16];
   char ftypestr[32];
   int flen;
   sprintf(tmpstr,"File$Type_%03x",(block->loadaddr & 0x000FFF00) >> 8);
   if (SWI_OS_ReadVarVal(tmpstr,ftypestr,32,&flen)==NULL) {
     ftypestr[flen]=0;
     printf("  Filetype: %s (&%.3X)\n",ftypestr,(block->loadaddr & 0x000FFF00) >> 8);
   } else {
     printf("  Filetype: &%.3X\n",(block->loadaddr & 0x000FFF00) >> 8);
   }
 }
 printf("  Access: ");
 if (block->attr & (1<<3))
   printf("L");
 if (block->attr & (1<<0))
   printf("W");
 if (block->attr & (1<<1))
   printf("R");
 printf("/");
 if (block->attr & (1<<4))
   printf("w");
 if (block->attr & (1<<5))
   printf("r");
 printf("\n\n");
}
#endif /* DEBUG */


/**********************************************/
/* internal help function for time conversion */
/**********************************************/
static int uxtime2acornftime(unsigned *pexadr, unsigned *pldadr, time_t ut)
{
   unsigned timlo;      /* 3 lower bytes of acorn file-time plus carry byte */
   unsigned timhi;      /* 2 high bytes of acorn file-time */

   timlo = ((unsigned)ut & 0x00ffffffU) * 100 + 0x00996a00U;
   timhi = ((unsigned)ut >> 24);
   timhi = timhi * 100 + 0x0000336eU + (timlo >> 24);
   if (timhi & 0xffff0000U)
       return 1;        /* calculation overflow, do not change time */

   /* insert the five time bytes into loadaddr and execaddr variables */
   *pexadr = (timlo & 0x00ffffffU) | ((timhi & 0x000000ffU) << 24);
   *pldadr = (*pldadr & 0xffffff00U) | ((timhi >> 8) & 0x000000ffU);

   return 0;            /* subject to future extension to signal overflow */
}


/****************************/
/* Function close_outfile() */
/****************************/

void close_outfile(__G)
    __GDEF
{
  zvoid *spark_ef;

  fclose(G.outfile);

  if ((spark_ef = getRISCOSexfield(G.extra_field, G.lrec.extra_field_length))
      != NULL) {
    setRISCOSexfield(G.filename, spark_ef);
  } else {
    unsigned int loadaddr, execaddr;
    int attr;
    int mode=G.pInfo->file_attr&0xffff;   /* chmod equivalent mode */

    time_t m_time;
#ifdef USE_EF_UT_TIME
    iztimes z_utime;
#endif

#ifdef USE_EF_UT_TIME
    if (G.extra_field &&
#ifdef IZ_CHECK_TZ
        G.tz_is_valid &&
#endif
        (ef_scan_for_izux(G.extra_field, G.lrec.extra_field_length, 0,
                          G.lrec.last_mod_dos_datetime, &z_utime, NULL)
         & EB_UT_FL_MTIME))
    {
        TTrace((stderr, "close_outfile:  Unix e.f. modif. time = %ld\n",
          z_utime.mtime));
        m_time = z_utime.mtime;
    } else
#endif /* USE_EF_UT_TIME */
        m_time = dos_to_unix_time(G.lrec.last_mod_dos_datetime);

    /* set the file's modification time */
    SWI_OS_File_5(G.filename, NULL, &loadaddr, NULL, NULL, &attr);

    uxtime2acornftime(&execaddr, &loadaddr, m_time);

    loadaddr = (loadaddr & 0xfff000ffU) |
               ((G.pInfo->file_attr&0xfff00000) >> 12);

    attr=(attr&0xffffff00) | ((mode&0400) >> 8) | ((mode&0200) >> 6) |
                             ((mode&0004) << 2) | ((mode&0002) << 4);

    SWI_OS_File_1(G.filename, loadaddr, execaddr, attr);
  }

} /* end function close_outfile() */




#ifdef TIMESTAMP

/***************************/
/*  Function stamp_file()  */
/***************************/

int stamp_file(fname, modtime)
    ZCONST char *fname;
    time_t modtime;
{
    unsigned int loadaddr, execaddr;
    int attr;

    /* set the file's modification time */
    if (SWI_OS_File_5((char *)fname, NULL, &loadaddr, NULL, NULL, &attr)
        != NULL)
        return -1;

    if (uxtime2acornftime(&execaddr, &loadaddr, modtime) != 0)
        return -1;

    return (SWI_OS_File_1((char *)fname, loadaddr, execaddr, attr) == NULL) ?
           0 : -1;

} /* end function stamp_file() */

#endif /* TIMESTAMP */




#ifndef SFX

/************************/
/*  Function version()  */
/************************/

void version(__G)
    __GDEF
{
    sprintf((char *)slide, LoadFarString(CompiledWith),
#ifdef __GNUC__
      "gcc ", __VERSION__,
#else
#  ifdef __CC_NORCROFT
      "Norcroft ", "cc",
#  else
      "cc", "",
#  endif
#endif

      "RISC OS",

      " (Acorn Computers Ltd)",

#ifdef __DATE__
      " on ", __DATE__
#else
      "", ""
#endif
      );

    (*G.message)((zvoid *)&G, slide, (ulg)strlen((char *)slide), 0);

} /* end function version() */

#endif /* !SFX */