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

  extract.c

  This file contains the high-level routines ("driver routines") for extrac-
  ting and testing zipfile members.  It calls the low-level routines in files
  explode.c, inflate.c, unreduce.c and unshrink.c.

  Contains:  extract_or_test_files()
             store_info()
             extract_or_test_entrylist()
             extract_or_test_member()
             TestExtraField()
             test_compr_eb()
             memextract()
             memflush()
             extract_izvms_block()    (VMS or VMS_TEXT_CONV)
             fnfilter()

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


#define __EXTRACT_C     /* identifies this source module */
#define UNZIP_INTERNAL
#include "unzip.h"
#ifdef WINDLL
#  ifdef POCKET_UNZIP
#    include "wince/intrface.h"
#  else
#    include "windll/windll.h"
#  endif
#endif
#include "crypt.h"

#define GRRDUMP(buf,len) { \
    int i, j; \
 \
    for (j = 0;  j < (len)/16;  ++j) { \
        printf("        "); \
        for (i = 0;  i < 16;  ++i) \
            printf("%02x ", (uch)(buf)[i+(j<<4)]); \
        printf("\n        "); \
        for (i = 0;  i < 16;  ++i) { \
            char c = (char)(buf)[i+(j<<4)]; \
 \
            if (c == '\n') \
                printf("\\n "); \
            else if (c == '\r') \
                printf("\\r "); \
            else \
                printf(" %c ", c); \
        } \
        printf("\n"); \
    } \
    if ((len) % 16) { \
        printf("        "); \
        for (i = j<<4;  i < (len);  ++i) \
            printf("%02x ", (uch)(buf)[i]); \
        printf("\n        "); \
        for (i = j<<4;  i < (len);  ++i) { \
            char c = (char)(buf)[i]; \
 \
            if (c == '\n') \
                printf("\\n "); \
            else if (c == '\r') \
                printf("\\r "); \
            else \
                printf(" %c ", c); \
        } \
        printf("\n"); \
    } \
}

static int store_info OF((__GPRO));
#ifdef SET_DIR_ATTRIB
static int extract_or_test_entrylist OF((__GPRO__ unsigned numchunk,
                ulg *pfilnum, ulg *pnum_bad_pwd, LONGINT *pold_extra_bytes,
                unsigned *pnum_dirs, dirtime **pdirlist,
                int error_in_archive));
#else
static int extract_or_test_entrylist OF((__GPRO__ unsigned numchunk,
                ulg *pfilnum, ulg *pnum_bad_pwd, LONGINT *pold_extra_bytes,
                int error_in_archive));
#endif
static int extract_or_test_member OF((__GPRO));
#ifndef SFX
   static int TestExtraField OF((__GPRO__ uch *ef, unsigned ef_len));
   static int test_compr_eb OF((__GPRO__ uch *eb, unsigned eb_size,
        unsigned compr_offset,
        int (*test_uc_ebdata)(__GPRO__ uch *eb, unsigned eb_size,
                              uch *eb_ucptr, ulg eb_ucsize)));
#endif
#if (defined(VMS) || defined(VMS_TEXT_CONV))
   static void decompress_bits OF((uch *outptr, unsigned needlen,
                                   ZCONST uch *bitptr));
#endif
#ifdef SET_DIR_ATTRIB
   static int dircomp OF((ZCONST zvoid *a, ZCONST zvoid *b));
#endif



/*******************************/
/*  Strings used in extract.c  */
/*******************************/

static ZCONST char Far VersionMsg[] =
  "   skipping: %-22s  need %s compat. v%u.%u (can do v%u.%u)\n";
static ZCONST char Far ComprMsgNum[] =
  "   skipping: %-22s  unsupported compression method %u\n";
#ifndef SFX
   static ZCONST char Far ComprMsgName[] =
     "   skipping: %-22s  `%s' method not supported\n";
   static ZCONST char Far CmprNone[]       = "store";
   static ZCONST char Far CmprShrink[]     = "shrink";
   static ZCONST char Far CmprReduce[]     = "reduce";
   static ZCONST char Far CmprImplode[]    = "implode";
   static ZCONST char Far CmprTokenize[]   = "tokenize";
   static ZCONST char Far CmprDeflate[]    = "deflate";
   static ZCONST char Far CmprDeflat64[]   = "deflate64";
   static ZCONST char Far CmprDCLImplode[] = "DCL implode";
   static ZCONST char Far *ComprNames[NUM_METHODS] = {
     CmprNone, CmprShrink, CmprReduce, CmprReduce, CmprReduce, CmprReduce,
     CmprImplode, CmprTokenize, CmprDeflate, CmprDeflat64, CmprDCLImplode
   };
#endif /* !SFX */
static ZCONST char Far FilNamMsg[] =
  "%s:  bad filename length (%s)\n";
static ZCONST char Far ExtFieldMsg[] =
  "%s:  bad extra field length (%s)\n";
static ZCONST char Far OffsetMsg[] =
  "file #%lu:  bad zipfile offset (%s):  %ld\n";
static ZCONST char Far ExtractMsg[] =
  "%8sing: %-22s  %s%s";
#ifndef SFX
   static ZCONST char Far LengthMsg[] =
     "%s  %s:  %ld bytes required to uncompress to %lu bytes;\n    %s\
      supposed to require %lu bytes%s%s%s\n";
#endif

static ZCONST char Far BadFileCommLength[] = "%s:  bad file comment length\n";
static ZCONST char Far LocalHdrSig[] = "local header sig";
static ZCONST char Far BadLocalHdr[] = "file #%lu:  bad local header\n";
static ZCONST char Far AttemptRecompensate[] =
  "  (attempting to re-compensate)\n";
#ifndef SFX
   static ZCONST char Far BackslashPathSep[] =
     "warning:  %s appears to use backslashes as path separators\n";
#endif
static ZCONST char Far AbsolutePathWarning[] =
  "warning:  stripped absolute path spec from %s\n";
static ZCONST char Far SkipVolumeLabel[] =
  "   skipping: %-22s  %svolume label\n";

#ifdef SET_DIR_ATTRIB  /* messages of code for setting directory attributes */
   static ZCONST char Far DirlistEntryNoMem[] =
     "warning:  cannot alloc memory for dir times/permissions/UID/GID\n";
   static ZCONST char Far DirlistSortNoMem[] =
     "warning:  cannot alloc memory to sort dir times/perms/etc.\n";
   static ZCONST char Far DirlistSetAttrFailed[] =
     "warning:  set times/attribs failed for %s\n";
#endif

#ifndef WINDLL
   static ZCONST char Far ReplaceQuery[] =
     "replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ";
   static ZCONST char Far AssumeNone[] = " NULL\n(assuming [N]one)\n";
   static ZCONST char Far NewNameQuery[] = "new name: ";
   static ZCONST char Far InvalidResponse[] = "error:  invalid response [%c]\n";
#endif /* !WINDLL */

static ZCONST char Far ErrorInArchive[] =
  "At least one %serror was detected in %s.\n";
static ZCONST char Far ZeroFilesTested[] =
  "Caution:  zero files tested in %s.\n";

#ifndef VMS
   static ZCONST char Far VMSFormatQuery[] =
     "\n%s:  stored in VMS format.  Extract anyway? (y/n) ";
#endif

#if CRYPT
   static ZCONST char Far SkipCannotGetPasswd[] =
     "   skipping: %-22s  unable to get password\n";
   static ZCONST char Far SkipIncorrectPasswd[] =
     "   skipping: %-22s  incorrect password\n";
   static ZCONST char Far FilesSkipBadPasswd[] =
     "%lu file%s skipped because of incorrect password.\n";
   static ZCONST char Far MaybeBadPasswd[] =
     "    (may instead be incorrect password)\n";
#else
   static ZCONST char Far SkipEncrypted[] =
     "   skipping: %-22s  encrypted (not supported)\n";
#endif

static ZCONST char Far NoErrInCompData[] =
  "No errors detected in compressed data of %s.\n";
static ZCONST char Far NoErrInTestedFiles[] =
  "No errors detected in %s for the %lu file%s tested.\n";
static ZCONST char Far FilesSkipped[] =
  "%lu file%s skipped because of unsupported compression or encoding.\n";

static ZCONST char Far ErrUnzipFile[] = "  error:  %s%s %s\n";
static ZCONST char Far ErrUnzipNoFile[] = "\n  error:  %s%s\n";
static ZCONST char Far NotEnoughMem[] = "not enough memory to ";
static ZCONST char Far InvalidComprData[] = "invalid compressed data to ";
static ZCONST char Far Inflate[] = "inflate";

#ifndef SFX
   static ZCONST char Far Explode[] = "explode";
#ifndef LZW_CLEAN
   static ZCONST char Far Unshrink[] = "unshrink";
#endif
#endif

#if (!defined(DELETE_IF_FULL) || !defined(HAVE_UNLINK))
   static ZCONST char Far FileTruncated[] =
     "warning:  %s is probably truncated\n";
#endif

static ZCONST char Far FileUnknownCompMethod[] =
  "%s:  unknown compression method\n";
static ZCONST char Far BadCRC[] = " bad CRC %08lx  (should be %08lx)\n";

      /* TruncEAs[] also used in OS/2 mapname(), close_outfile() */
char ZCONST Far TruncEAs[] = " compressed EA data missing (%d bytes)%s";
char ZCONST Far TruncNTSD[] =
  " compressed WinNT security data missing (%d bytes)%s";

#ifndef SFX
   static ZCONST char Far InconsistEFlength[] = "bad extra-field entry:\n \
     EF block length (%u bytes) exceeds remaining EF data (%u bytes)\n";
   static ZCONST char Far InvalidComprDataEAs[] =
     " invalid compressed data for EAs\n";
#  if (defined(WIN32) && defined(NTSD_EAS))
     static ZCONST char Far InvalidSecurityEAs[] =
       " EAs fail security check\n";
#  endif
   static ZCONST char Far UnsuppNTSDVersEAs[] =
     " unsupported NTSD EAs version %d\n";
   static ZCONST char Far BadCRC_EAs[] = " bad CRC for extended attributes\n";
   static ZCONST char Far UnknComprMethodEAs[] =
     " unknown compression method for EAs (%u)\n";
   static ZCONST char Far NotEnoughMemEAs[] =
     " out of memory while inflating EAs\n";
   static ZCONST char Far UnknErrorEAs[] =
     " unknown error on extended attributes\n";
#endif /* !SFX */

static ZCONST char Far UnsupportedExtraField[] =
  "\nerror:  unsupported extra-field compression type (%u)--skipping\n";
static ZCONST char Far BadExtraFieldCRC[] =
  "error [%s]:  bad extra-field CRC %08lx (should be %08lx)\n";





/**************************************/
/*  Function extract_or_test_files()  */
/**************************************/

int extract_or_test_files(__G)    /* return PK-type error code */
     __GDEF
{
    unsigned i, j;
    long cd_bufstart;
    uch *cd_inptr;
    int cd_incnt;
    ulg filnum=0L, blknum=0L;
    int reached_end, no_endsig_found;
    int error, error_in_archive=PK_COOL;
    int *fn_matched=NULL, *xn_matched=NULL;
    unsigned members_processed;
    ulg num_skipped=0L, num_bad_pwd=0L;
    LONGINT old_extra_bytes = 0L;
#ifdef SET_DIR_ATTRIB
    unsigned num_dirs=0;
    dirtime *dirlist=(dirtime *)NULL, **sorted_dirlist=(dirtime **)NULL;
#endif

/*---------------------------------------------------------------------------
    The basic idea of this function is as follows.  Since the central di-
    rectory lies at the end of the zipfile and the member files lie at the
    beginning or middle or wherever, it is not very desirable to simply
    read a central directory entry, jump to the member and extract it, and
    then jump back to the central directory.  In the case of a large zipfile
    this would lead to a whole lot of disk-grinding, especially if each mem-
    ber file is small.  Instead, we read from the central directory the per-
    tinent information for a block of files, then go extract/test the whole
    block.  Thus this routine contains two small(er) loops within a very
    large outer loop:  the first of the small ones reads a block of files
    from the central directory; the second extracts or tests each file; and
    the outer one loops over blocks.  There's some file-pointer positioning
    stuff in between, but that's about it.  Btw, it's because of this jump-
    ing around that we can afford to be lenient if an error occurs in one of
    the member files:  we should still be able to go find the other members,
    since we know the offset of each from the beginning of the zipfile.
  ---------------------------------------------------------------------------*/

    G.pInfo = G.info;

#if CRYPT
    G.newzip = TRUE;
#endif
#ifndef SFX
    G.reported_backslash = FALSE;
#endif

    /* malloc space for check on unmatched filespecs (OK if one or both NULL) */
    if (G.filespecs > 0  &&
        (fn_matched=(int *)malloc(G.filespecs*sizeof(int))) != (int *)NULL)
        for (i = 0;  i < G.filespecs;  ++i)
            fn_matched[i] = FALSE;
    if (G.xfilespecs > 0  &&
        (xn_matched=(int *)malloc(G.xfilespecs*sizeof(int))) != (int *)NULL)
        for (i = 0;  i < G.xfilespecs;  ++i)
            xn_matched[i] = FALSE;

/*---------------------------------------------------------------------------
    Begin main loop over blocks of member files.  We know the entire central
    directory is on this disk:  we would not have any of this information un-
    less the end-of-central-directory record was on this disk, and we would