extrafld.c

给出了 zip 压缩算法的完整实现过程。

    return ef;
}





/*
* Build the new mac local extra field header.
* All native data are in Intel (=little-endian) format
*/
unsigned make_extrafield_MAC3(char *ef)
{
    char *ef_m3_begin = ef;
    char *temp_Pathname;
    char tmp_buffer[NAME_MAX];
    unsigned char comment[257];
    unsigned short FLength = 0;
    unsigned short CLength = 0;
    short   tempFork;
    OSErr       err;

    Assert_it(ef, "make_extrafield_MAC3","")

    if (MacZip.isMacStatValid == false)
    {
        fprintf(stderr,
                "Internal Logic Error: [%d/%s] MacStat is out of sync !",
                __LINE__, __FILE__);
        exit(-1);
    }

    /* Start Macintosh Finder FInfo structure except Type/Creator
       (see make_EF_Head_MAC3()) 8 Bytes overall */

                                             /* file Finder Flags: 2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFlags);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFlags >> 8);

                                    /* Finders Icon position of a file*/
                                   /* V/Y-Position:                2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.v);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.v >> 8);

                                   /* H/X-Position:                2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.h);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.h >> 8);

                               /* fdFldr Folder containing file    2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFldr);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFldr >> 8);

                /* End Macintosh Finder FInfo structure */

                                                    /*    8 Bytes so far ... */

                /* Start Macintosh Finder FXInfo structure  16 Bytes overall */
                                                    /* Icon ID:    2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdIconID);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdIconID >> 8);

                                                        /* unused: 6 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[0]);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[0] >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[1]);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[1] >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[2]);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdUnused[2] >> 8);
                                                   /* Script flag: 1 Byte */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdScript);
                                                /* More flag bits: 1 Byte */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdXFlags);
                                                /* Comment ID      2 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdComment);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdComment >> 8);

                                                   /* Home Dir ID: 4 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdPutAway);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdPutAway >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdPutAway >> 16);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlXFndrInfo.fdPutAway >> 24);
                /* End Macintosh Finder FXInfo structure */

                                                    /*   24 Bytes so far ... */

                                            /* file version number 1 Byte */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFVersNum);

                                        /* directory access rights 1 Byte */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioACUser);

                                                 /* Creation-time  4 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlCrDat);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlCrDat  >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlCrDat >> 16);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlCrDat >> 24);
                                             /* Modification-time  4 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlMdDat);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlMdDat >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlMdDat >> 16);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlMdDat >> 24);
                                                   /* Backup-time  4 Bytes */
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlBkDat);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlBkDat >> 8);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlBkDat >> 16);
    *ef++ = (char)(MacZip.fpb.hFileInfo.ioFlBkDat >> 24);

                                                    /*   38 Bytes so far ... */
#ifdef USE_EF_UT_TIME
    if (MacZip.HaveGMToffset) {
                                              /* GMT-Offset times  12 Bytes */
        *ef++ = (char)(MacZip.Cr_UTCoffs);
        *ef++ = (char)(MacZip.Cr_UTCoffs >> 8);
        *ef++ = (char)(MacZip.Cr_UTCoffs >> 16);
        *ef++ = (char)(MacZip.Cr_UTCoffs >> 24);
        *ef++ = (char)(MacZip.Md_UTCoffs);
        *ef++ = (char)(MacZip.Md_UTCoffs >> 8);
        *ef++ = (char)(MacZip.Md_UTCoffs >> 16);
        *ef++ = (char)(MacZip.Md_UTCoffs >> 24);
        *ef++ = (char)(MacZip.Bk_UTCoffs);
        *ef++ = (char)(MacZip.Bk_UTCoffs >> 8);
        *ef++ = (char)(MacZip.Bk_UTCoffs >> 16);
        *ef++ = (char)(MacZip.Bk_UTCoffs >> 24);
    }
                                                    /*   50 Bytes so far ... */
#endif

                                  /* Text Encoding Base (charset)  2 Bytes */
    *ef++ = (char)(MacZip.CurrTextEncodingBase);
    *ef++ = (char)(MacZip.CurrTextEncodingBase >> 8);
                                                    /*   52 Bytes so far ... */

    /* MacZip.CurrentFork will be changed, so we have to save it  */
    tempFork = MacZip.CurrentFork;
    if (!MacZip.StoreFullPath)  {
        temp_Pathname = StripPartialDir(tmp_buffer, MacZip.SearchDir,
                                        MacZip.FullPath);
    } else {
        temp_Pathname = MacZip.FullPath;
    }
    MacZip.CurrentFork = tempFork;

    FLength = strlen(temp_Pathname) + 1;
    memcpy( ef, temp_Pathname, (size_t)FLength );
    ef += FLength;          /* make room for the string -  variable length */

    err = FSpLocationFromFullPath(strlen(MacZip.FullPath), MacZip.FullPath,
                                  &MacZip.fileSpec);
    printerr("FSpLocationFromFullPath:", err, err,
             __LINE__, __FILE__, tmp_buffer);

    err = FSpDTGetComment(&MacZip.fileSpec, comment);
    printerr("FSpDTGetComment:", (err != -5012) && (err != 0), err,
             __LINE__, __FILE__, "");
    PToCCpy(comment,tmp_buffer);

    CLength = strlen(tmp_buffer) + 1;
    memcpy( ef, tmp_buffer, (size_t)CLength );
    ef += CLength;          /* make room for the string -  variable length */

    if (verbose) printf("\n comment: [%s]", tmp_buffer);

    return (unsigned)(ef - ef_m3_begin);
}






/*
* Print all native data of the new mac local extra field.
* It's for debugging purposes and disabled by default.
*/

static void PrintFileInfo(void)
{
DateTimeRec  MacTime;

printf("\n\n---------------------------------------------"\
       "----------------------------------");
printf("\n FullPath Name =                   [%s]",  MacZip.FullPath);
printf("\n File Attributes =                  %s  0x%x  %d",
          sBit2Str(MacZip.fpb.hFileInfo.ioFlAttrib),
          MacZip.fpb.hFileInfo.ioFlAttrib,
          MacZip.fpb.hFileInfo.ioFlAttrib);
printf("\n Enclosing Folder ID# =             0x%x  %d",
          MacZip.fpb.hFileInfo.ioFlParID,
          MacZip.fpb.hFileInfo.ioFlParID);

if (!MacZip.isDirectory)
{
printf("\n File Type =                        [%c%c%c%c]  0x%lx",
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 24,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 16,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 8,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType);

printf("\n File Creator =                     [%c%c%c%c]  0x%lx",
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 24,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 16,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 8,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator);

printf("\n Data Fork :" );
printf("\n    Actual (Logical) Length =       %d  0x%x ",
              MacZip.fpb.hFileInfo.ioFlLgLen,
              MacZip.fpb.hFileInfo.ioFlLgLen);
printf("\n    Allocated (Physical) Length =   %d  0x%x",
              MacZip.fpb.hFileInfo.ioFlPyLen,
              MacZip.fpb.hFileInfo.ioFlPyLen);
printf("\n Resource Fork :" );
printf("\n    Actual (Logical) Length =       %d  0x%x",
              MacZip.fpb.hFileInfo.ioFlRLgLen,
              MacZip.fpb.hFileInfo.ioFlRLgLen );
printf("\n    Allocated (Physical) Length =   %d  0x%x",
              MacZip.fpb.hFileInfo.ioFlRPyLen,
              MacZip.fpb.hFileInfo.ioFlRPyLen );
}

printf("\n Dates :               ");

SecondsToDate (MacZip.CreatDate, &MacTime);
printf("\n    Created  =                       %4d/%2d/%2d %2d:%2d:%2d  ",
    MacTime.year,
    MacTime.month,
    MacTime.day,
    MacTime.hour,
    MacTime.minute,
    MacTime.second);

SecondsToDate (MacZip.BackDate, &MacTime);
printf("\n    Backup   =                       %4d/%2d/%2d %2d:%2d:%2d  ",
    MacTime.year,
    MacTime.month,
    MacTime.day,
    MacTime.hour,
    MacTime.minute,
    MacTime.second);

SecondsToDate (MacZip.ModDate, &MacTime);
printf("\n    Modified =                       %4d/%2d/%2d %2d:%2d:%2d  ",
    MacTime.year,
    MacTime.month,
    MacTime.day,
    MacTime.hour,
    MacTime.minute,
    MacTime.second);

if (!MacZip.isDirectory)
{
printf("\n Finder Flags :                     %s  0x%x  %d",
          sBit2Str(MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFlags),
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFlags,
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdFlags);
printf("\n Finder Icon Position =          X: %d  0x%x ",
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.h,
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.h);
printf("\n                                  Y: %d  0x%x ",
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.v,
          MacZip.fpb.hFileInfo.ioFlFndrInfo.fdLocation.v);
}
else
{
printf("\n Finder Flags :                     %s  0x%x  %d",
          sBit2Str(MacZip.fpb.dirInfo.ioDrUsrWds.frFlags),
          MacZip.fpb.dirInfo.ioDrUsrWds.frFlags,
          MacZip.fpb.dirInfo.ioDrUsrWds.frFlags);
printf("\n Finder Icon Position =          X: %d  0x%x ",
          MacZip.fpb.dirInfo.ioDrUsrWds.frLocation.h,
          MacZip.fpb.dirInfo.ioDrUsrWds.frLocation.h);
printf("\n                                  Y: %d  0x%x ",
          MacZip.fpb.dirInfo.ioDrUsrWds.frLocation.v,
          MacZip.fpb.dirInfo.ioDrUsrWds.frLocation.v);
}

printf("\n----------------------------------------------------"\
        "---------------------------\n");
}



/*
* If the switch '-v' is used, print some more info.
*/

static void print_extra_info(void)
{
char Fork[20];

if (MacZip.CurrentFork == DataFork) sstrcpy(Fork,"<DataFork>");
else  sstrcpy(Fork,"<ResourceFork>");

printf("\n%16s [%c%c%c%c]  [%c%c%c%c]",Fork,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 24,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 16,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType >> 8,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdType,

    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 24,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 16,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator >> 8,
    MacZip.fpb.hFileInfo.ioFlFndrInfo.fdCreator);
}