theos.c

zip压缩

/*
  Copyright (c) 1990-2002 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2000-Apr-09 or later
  (the contents of which are also included in unzip.h) for terms of use.
  If, for some reason, all these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/*---------------------------------------------------------------------------

  theos.c

  Theos-specific routines for use with Info-ZIP's UnZip 5.41 and later.

  Contains:  do_wild()           <-- generic enough to put in fileio.c?
             mapattr()
             mapname()
             checkdir()
             close_outfile()
             set_direc_attribs()
             stamp_file()
             version()

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


#define UNZIP_INTERNAL
#include "unzip.h"
#include <direct.h>
#include <sc.h>
#include <fdb.h>
#include <nuc.h>
#include <peek.h>

/* standard function doesn't work with a trailing / */
#define opendir(a) _opendir(a)
extern DIR* _opendir(const char* dirpath);

#ifdef ACORN_FTYPE_NFS
/* Acorn bits for NFS filetyping */
typedef struct {
  uch ID[2];
  uch size[2];
  uch ID_2[4];
  uch loadaddr[4];
  uch execaddr[4];
  uch attr[4];
} RO_extra_block;

#endif /* ACORN_FTYPE_NFS */

static int created_dir;        /* used in mapname(), checkdir() */
static int renamed_fullpath;   /* ditto */

#define _FDB_SHARED_EXECUTE_PROTECT _FDB_MODIFIED

uch _um2tm_(ush mask);

int chmodv2_3(const char *fname, short mask)
{
    return _filechange(fname,'p',(size_t) _um2tm_(mask)|0x80);
}

int chlen(char *fname, unsigned short reclen, unsigned short keylen)
{
    size_t a = reclen + ((size_t) keylen << 16);
    return _filechange(fname,'ma',(size_t) &a);
}

#define chgrow(a,b) ((int) _filechange(a,'g',(size_t)(b)))
#define chorg(a,b)  ((int) _filechange(a,'m',(size_t)(b)))

#ifndef SFX

/*************************/
/* Function dateformat() */
/*************************/

int dateformat()
{
/*---------------------------------------------------------------------------
    For those operating systems that support it, this function returns a
    value that tells how national convention says that numeric dates are
    displayed.  Return values are DF_YMD, DF_DMY and DF_MDY (the meanings
    should be fairly obvious).
  ---------------------------------------------------------------------------*/

    switch (peeknuc(&NUC->dateopt) & (aform|eform|iform)) {
    case aform: return DF_MDY;
    case eform: return DF_DMY;
    }
    return DF_YMD;
}


/* usual THEOS match function for filenames */

/* match from Phase One Systems */

/* Returns non-zero if string matches the literal mask */
int match(string, pattern, ignore_case)
    ZCONST char *string;
    ZCONST char *pattern;
    int ignore_case;            /* unused in this variant of match()! */
{
    int matched, k;

    if (!(*pattern))
        return 1;
    for(;;) {
        if ( (!(*string)) && (!(*pattern)) )
            return(1);
        else if ( !(*pattern) )
            return(0);
        else if (*pattern == '*') {
            if (!*(pattern+1))
                return(1);
            k=0;
            do {
                matched = match(string+k, pattern+1, ignore_case);
                k++;
            } while ( (!matched) && *(string+k));
            return(matched);
        } else if (*pattern == '@') {
            if (!((*string >= 'a' && *string <= 'z')
                ||(*string >= 'A' && *string <= 'Z')))
                return(0);
        } else if (*pattern == '#') {
            if (*string < '0' || *string > '9')
                return(0);
        } else if (*pattern != '?') {
            if (toupper(*string) != toupper(*pattern))
                return(0);

        }
        string++; pattern++;
    }
} /* end function match() */



/**********************/
/* Function do_wild() */   /* for porting:  dir separator; match(ignore_case) */
/**********************/

char *do_wild(__G__ wildspec)
    __GDEF
    ZCONST char *wildspec;  /* only used first time on a given dir */
{
    static DIR *wild_dir = (DIR *)NULL;
    static ZCONST char *wildname;
    static char *dirname, matchname[FILNAMSIZ];
    static int notfirstcall=FALSE, have_dirname, dirnamelen;
    struct dirent *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 (!notfirstcall) {    /* first call:  must initialize everything */
        notfirstcall = TRUE;

        if (!iswild(wildspec)) {
            strcpy(matchname, wildspec);
            have_dirname = FALSE;
            wild_dir = NULL;
            return matchname;
        }

        /* break the wildspec into a directory part and a wildcard filename */
        if ((wildname = (ZCONST char *)strrchr(wildspec, '/')) ==
            (ZCONST char *)NULL)
        {
            dirname = ".";
            dirnamelen = 1;
            have_dirname = FALSE;
            wildname = wildspec;
        } else {
            ++wildname;     /* point at character after '/' */
            dirnamelen = wildname - wildspec;
            if ((dirname = (char *)malloc(dirnamelen+1)) == (char *)NULL) {
                Info(slide, 0x201, ((char *)slide,
                  "warning:  cannot 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;
        }

        if ((wild_dir = opendir(dirname)) != (DIR *)NULL) {
            while ((file = readdir(wild_dir)) != (struct dirent *)NULL) {
                Trace((stderr, "do_wild:  readdir returns %s\n",
                  FnFilter1(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(wild_dir);
            wild_dir = (DIR *)NULL;
        }

        /* 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 (wild_dir == (DIR *)NULL) {
        notfirstcall = FALSE; /* 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(wild_dir)) != (struct dirent *)NULL) {
        Trace((stderr, "do_wild:  readdir returns %s\n",
          FnFilter1(file->d_name)));
        if (file->d_name[0] == '.' && wildname[0] != '.')
            continue;   /* Unix:  '*' and '?' do not match leading dot */
        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;
        }
    }

    closedir(wild_dir);     /* have read at least one entry; nothing left */
    wild_dir = (DIR *)NULL;
    notfirstcall = FALSE;   /* reset for new wildspec */
    if (have_dirname)
        free(dirname);
    return (char *)NULL;

} /* end function do_wild() */

#endif /* !SFX */





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

int mapattr(__G)
    __GDEF
{
    ulg tmp = G.crec.external_file_attributes;

    G.pInfo->file_attr = 0;
    /* initialized to 0 for check in "default" branch below... */

    switch (G.pInfo->hostnum) {
        case AMIGA_:
            tmp = (unsigned)(tmp>>17 & 7);   /* Amiga RWE bits */
            G.pInfo->file_attr = (unsigned)(tmp<<6 | tmp<<3 | tmp);
            break;
        case UNIX_:
        case VMS_:
        case ACORN_:
        case ATARI_:
        case BEOS_:
        case QDOS_:
        case TANDEM_:
        case THEOS_:
            G.pInfo->file_attr = (unsigned)(tmp >> 16);
            if (G.pInfo->file_attr != 0 || !G.extra_field) {
                return 0;
            } else {
                /* Some (non-Info-ZIP) implementations of Zip for Unix and
                 * VMS (and probably others ??) leave 0 in the upper 16-bit
                 * part of the external_file_attributes field. Instead, they
                 * store file permission attributes in some extra field.
                 * As a work-around, we search for the presence of one of
                 * these extra fields and fall back to the MSDOS compatible
                 * part of external_file_attributes if one of the known
                 * e.f. types has been detected.
                 * Later, we might implement extraction of the permission
                 * bits from the VMS extra field. But for now, the work-around
                 * should be sufficient to provide "readable" extracted files.
                 * (For ASI Unix e.f., an experimental remap from the e.f.
                 * mode value IS already provided!)
                 */
                ush ebID;
                unsigned ebLen;
                uch *ef = G.extra_field;
                unsigned ef_len = G.crec.extra_field_length;
                int r = FALSE;

                while (!r && ef_len >= EB_HEADSIZE) {
                    ebID = makeword(ef);
                    ebLen = (unsigned)makeword(ef+EB_LEN);
                    if (ebLen > (ef_len - EB_HEADSIZE))
                        /* discoverd some e.f. inconsistency! */
                        break;
                    switch (ebID) {
                      case EF_ASIUNIX:
                        if (ebLen >= (EB_ASI_MODE+2)) {
                            G.pInfo->file_attr =
                              (unsigned)makeword(ef+(EB_HEADSIZE+EB_ASI_MODE));
                            /* force stop of loop: */
                            ef_len = (ebLen + EB_HEADSIZE);
                            break;
                        }
                        /* else: fall through! */
                      case EF_PKVMS:
                        /* "found nondecypherable e.f. with perm. attr" */
                        r = TRUE;
                      default:
                        break;
                    }
                    ef_len -= (ebLen + EB_HEADSIZE);
                    ef += (ebLen + EB_HEADSIZE);
                }
                if (!r)
                    return 0;
            }
            /* fall through! */
        /* all remaining cases:  expand MSDOS read-only bit into write perms */
        case FS_FAT_:
            /* PKWARE's PKZip for Unix marks entries as FS_FAT_, but stores the
             * Unix attributes in the upper 16 bits of the external attributes
             * field, just like Info-ZIP's Zip for Unix.  We try to use that
             * value, after a check for consistency with the MSDOS attribute
             * bits (see below).
             */
            G.pInfo->file_attr = (unsigned)(tmp >> 16);
            /* fall through! */
        case FS_HPFS_:
        case FS_NTFS_:
        case MAC_:
        case TOPS20_:
        default:
            /* Ensure that DOS subdir bit is set when the entry's name ends
             * in a '/'.  Some third-party Zip programs fail to set the subdir
             * bit for directory entries.
             */
            if ((tmp & 0x10) == 0) {
                extent fnlen = strlen(G.filename);
                if (fnlen > 0 && G.filename[fnlen-1] == '/')
                    tmp |= 0x10;
            }
            /* read-only bit --> write perms; subdir bit --> dir exec bit */
            tmp = !(tmp & 1) << 1  |  (tmp & 0x10) >> 4;
            if ((G.pInfo->file_attr & 0700) == (unsigned)(0400 | tmp<<6))
                /* keep previous G.pInfo->file_attr setting, when its "owner"
                 * part appears to be consistent with DOS attribute flags!
                 */
                return 0;
            G.pInfo->file_attr = (unsigned)(0444 | tmp<<6 | tmp<<3 | tmp);
            break;
    } /* end switch (host-OS-created-by) */

    /* for originating systems with no concept of "group," "other," "system": */
    G.pInfo->file_attr &= ~tmp;

    return 0;

} /* end function mapattr() */



/* portabilibity functions to ensure access to port 2.0 and new ports */

int isv2_3()
{