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

  unix.c

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

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

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


#define UNZIP_INTERNAL
#include "unzip.h"

#ifdef SCO_XENIX
#  define SYSNDIR
#else  /* SCO Unix, AIX, DNIX, TI SysV, Coherent 4.x, ... */
#  if defined(__convexc__) || defined(SYSV) || defined(CRAY) || defined(BSD4_4)
#    define DIRENT
#  endif
#endif
#if defined(_AIX) || defined(__mpexl)
#  define DIRENT
#endif
#ifdef COHERENT
#  if defined(_I386) || (defined(__COHERENT__) && (__COHERENT__ >= 0x420))
#    define DIRENT
#  endif
#endif

/* GRR:  may need to uncomment this: */
#if 0
#if defined(_POSIX_VERSION)
#  define DIRENT
#endif
#endif

#ifdef DIRENT
#  include <dirent.h>
#else
#  ifdef SYSV
#    ifdef SYSNDIR
#      include <sys/ndir.h>
#    else
#      include <ndir.h>
#    endif
#  else /* !SYSV */
#    ifndef NO_SYSDIR
#      include <sys/dir.h>
#    endif
#  endif /* ?SYSV */
#  ifndef dirent
#    define dirent direct
#  endif
#endif /* ?DIRENT */

#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 */


#ifndef SFX
#ifdef NO_DIR                  /* for AT&T 3B1 */

#define opendir(path) fopen(path,"r")
#define closedir(dir) fclose(dir)
typedef FILE DIR;
typedef struct zdir {
    FILE *dirhandle;
    struct dirent *entry;
} DIR
DIR *opendir OF((ZCONST char *dirspec));
void closedir OF((DIR *dirp));
struct dirent *readdir OF((DIR *dirp));

DIR *opendir(dirspec)
    ZCONST char *dirspec;
{
    DIR *dirp;

    if ((dirp = malloc(sizeof(DIR)) != NULL) {
        if ((dirp->dirhandle = fopen(dirspec, "r")) == NULL) {
            free(dirp);
            dirp = NULL;
        }
    }
    return dirp;
}

void closedir(dirp)
    DIR *dirp;
{
    fclose(dirp->dirhandle);
    free(dirp);
}

/*
 *  Apparently originally by Rich Salz.
 *  Cleaned up and modified by James W. Birdsall.
 */
struct dirent *readdir(dirp)
    DIR *dirp;
{

    if (dirp == NULL)
        return NULL;

    for (;;)
        if (fread(&(dirp->entry), sizeof (struct dirent), 1,
                  dirp->dirhandle) == 0)
            return (struct dirent *)NULL;
        else if ((dirp->entry).d_ino)
            return &(dirp->entry);

} /* end function readdir() */

#endif /* NO_DIR */


/**********************/
/* 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 */
{
/* these statics are now declared in SYSTEM_SPECIFIC_GLOBALS in unxcfg.h:
    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 (!G.notfirstcall) {  /* first call:  must initialize everything */
        G.notfirstcall = TRUE;

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

        /* break the wildspec into a directory part and a wildcard filename */
        if ((G.wildname = (ZCONST char *)strrchr(wildspec, '/')) == NULL) {
            G.dirname = ".";
            G.dirnamelen = 1;
            G.have_dirname = FALSE;
            G.wildname = wildspec;
        } else {
            ++G.wildname;     /* point at character after '/' */
            G.dirnamelen = G.wildname - wildspec;
            if ((G.dirname = (char *)malloc(G.dirnamelen+1)) == (char *)NULL) {
                Info(slide, 0x201, ((char *)slide,
                  "warning:  cannot allocate wildcard buffers\n"));
                strcpy(G.matchname, wildspec);
                return G.matchname; /* but maybe filespec was not a wildcard */
            }
            strncpy(G.dirname, wildspec, G.dirnamelen);
            G.dirname[G.dirnamelen] = '\0';   /* terminate for strcpy below */
            G.have_dirname = TRUE;
        }

        if ((G.wild_dir = (zvoid *)opendir(G.dirname)) != (zvoid *)NULL) {
            while ((file = readdir((DIR *)G.wild_dir)) !=
                   (struct dirent *)NULL) {
                Trace((stderr, "do_wild:  readdir returns %s\n",
                  FnFilter1(file->d_name)));
                if (file->d_name[0] == '.' && G.wildname[0] != '.')
                    continue; /* Unix:  '*' and '?' do not match leading dot */
                if (match(file->d_name, G.wildname, 0) && /* 0 == case sens. */
                    /* skip "." and ".." directory entries */
                    strcmp(file->d_name, ".") && strcmp(file->d_name, "..")) {
                    Trace((stderr, "do_wild:  match() succeeds\n"));
                    if (G.have_dirname) {
                        strcpy(G.matchname, G.dirname);
                        strcpy(G.matchname+G.dirnamelen, file->d_name);
                    } else
                        strcpy(G.matchname, file->d_name);
                    return G.matchname;
                }
            }
            /* if we get to here directory is exhausted, so close it */
            closedir((DIR *)G.wild_dir);
            G.wild_dir = (zvoid *)NULL;
        }
        Trace((stderr, "do_wild:  opendir(%s) returns NULL\n",
          FnFilter1(G.dirname)));

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

    /* last time through, might have failed opendir but returned raw wildspec */
    if ((DIR *)G.wild_dir == (DIR *)NULL) {
        G.notfirstcall = FALSE; /* nothing left--reset for new wildspec */
        if (G.have_dirname)
            free(G.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 *)G.wild_dir)) != (struct dirent *)NULL) {
        Trace((stderr, "do_wild:  readdir returns %s\n",
          FnFilter1(file->d_name)));
        if (file->d_name[0] == '.' && G.wildname[0] != '.')
            continue;   /* Unix:  '*' and '?' do not match leading dot */
        if (match(file->d_name, G.wildname, 0)) { /* 0 == don't ignore case */
            Trace((stderr, "do_wild:  match() succeeds\n"));
            if (G.have_dirname) {
                /* strcpy(G.matchname, G.dirname); */
                strcpy(G.matchname+G.dirnamelen, file->d_name);
            } else
                strcpy(G.matchname, file->d_name);
            return G.matchname;
        }
    }

    closedir((DIR *)G.wild_dir);  /* at least one entry read; nothing left */
    G.wild_dir = (zvoid *)NULL;
    G.notfirstcall = FALSE;       /* reset for new wildspec */
    if (G.have_dirname)
        free(G.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 THEOS_:
            tmp &= 0xF1FFFFFFL;
            if ((tmp & 0xF0000000L) != 0x40000000L)
                tmp &= 0x01FFFFFFL;     /* not a dir, mask all ftype bits */
            else
                tmp &= 0x41FFFFFFL;     /* leave directory bit as set */
            /* fall through! */
        case UNIX_:
        case VMS_:
        case ACORN_:
        case ATARI_:
        case BEOS_:
        case QDOS_:
        case TANDEM_:
            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 */