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C/C++ Source or Header  |  1992-05-09  |  13KB  |  611 lines
  1. /*
  2. **    $Id: Identify.c,v 1.4 92/04/21 16:58:56 olsen Sta Locker: olsen $
  3. **    $Revision: 1.4 $
  4. **    $Date: 92/04/21 16:58:56 $
  5. **
  6. **    Heuristic file type identification routines
  7. **
  8. **    Copyright © 1990-1992 by Olaf `Olsen' Barthel & MXM
  9. **        All Rights Reserved
  10. */
  11.  
  12. #include "termGlobal.h"
  13.  
  14.     /* The file types we know. */
  15.  
  16. enum    {    TYPE_DIR,TYPE_FILE,
  17.         TYPE_ICON,
  18.         TYPE_TEXT,
  19.         TYPE_C,TYPE_H,
  20.         TYPE_ASM,TYPE_I,
  21.         TYPE_MOD,
  22.         TYPE_REXX,
  23.         TYPE_BASIC,
  24.         TYPE_AMIGAGUIDE,
  25.         TYPE_TEX,TYPE_METAFONT,TYPE_GF,TYPE_TEXFONT,TYPE_TEXDVI,TYPE_FLIB,
  26.         TYPE_OLDMANX,TYPE_NEWMANX,TYPE_OLDMANXLIB,TYPE_NEWMANXLIB,
  27.         TYPE_OBJECT,TYPE_LIB,
  28.         TYPE_EXECUTABLE,
  29.         TYPE_LIBRARY,TYPE_DEVICE,TYPE_FILESYS,TYPE_HANDLER,
  30.         TYPE_GIF,TYPE_DEGAS,TYPE_MACPAINT,TYPE_SUPERPAINT,TYPE_PICT,TYPE_SUNRASTER,TYPE_POSTSCRIPT,TYPE_PCX,TYPE_TIFF,TYPE_BMP,TYPE_JFIF,TYPE_ILBM,
  31.         TYPE_ANIM,TYPE_8SVX,TYPE_SMUS,TYPE_FTXT,TYPE_PREFS,TYPE_TERM,TYPE_AMIGAVISION,TYPE_IFF,
  32.         TYPE_IMPLODER,TYPE_POWERPACKER,TYPE_LHPAK,TYPE_LHASFX,
  33.         TYPE_ARC,TYPE_ARJ,TYPE_COMPRESSED,TYPE_CPIO,TYPE_UUENCODED,TYPE_FREEZE,TYPE_MACCOMPRESS,TYPE_COMPACT,TYPE_DIAMOND,TYPE_LHARC,TYPE_LHA,TYPE_ZOO,TYPE_ZIP,TYPE_STUFFIT,TYPE_PACKIT,TYPE_DMS,TYPE_WARP,TYPE_ZOOM,
  34.         TYPE_SPARCOBJECT,TYPE_SPARCEXECUTABLE,
  35.         TYPE_MSDOSEXECUTABLE,
  36.         TYPE_ATARIEXECUTABLE,
  37.         TYPE_MACEXECUTABLE
  38.     };
  39.  
  40.     /* A structure containing both a file name suffix and the
  41.      * approriate file type.
  42.      */
  43.  
  44. struct Suffix
  45. {
  46.     UBYTE    *Name;
  47.     UBYTE     Type;
  48. };
  49.  
  50.     /* A table of valid ASCII characters (7 bits). */
  51.  
  52. STATIC BYTE ID_ValidTab[256] =
  53. {
  54.     0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,
  55.     0,1,0,1,0,0,0,0,0,0,0,1,0,0,0,0,
  56.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  57.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  58.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  59.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  60.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  61.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  62.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  63.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  64.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  65.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  66.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  67.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  68.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  69.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  70. };
  71.  
  72.     /* A table of clearly invalid ASCII characters (8 bits). */
  73.  
  74. STATIC BYTE ID_InvalidTab[256] =
  75. {
  76.     1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,
  77.     1,0,1,0,1,1,1,1,1,1,1,0,1,1,1,1,
  78.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  79.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  80.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  81.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  82.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  83.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  84.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  85.     1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
  86.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  87.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  88.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  89.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  90.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  91.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  92. };
  93.  
  94.     /* Some file name suffixes for text files and the approriate
  95.      * file types.
  96.      */
  97.  
  98. STATIC struct Suffix TextSuffix[] =
  99. {
  100.     ".C",        TYPE_C,
  101.     ".CPP",        TYPE_C,
  102.     ".CXX",        TYPE_C,
  103.     ".C++",        TYPE_C,
  104.     ".CC",        TYPE_C,
  105.     ".H",        TYPE_H,
  106.     ".ASM",        TYPE_ASM,
  107.     ".A",        TYPE_ASM,
  108.     ".S",        TYPE_ASM,
  109.     ".I",        TYPE_I,
  110.     ".BAS",        TYPE_BASIC,
  111.     ".GFA",        TYPE_BASIC,
  112.     ".REXX",    TYPE_REXX,
  113.     ".CED",        TYPE_REXX,
  114.     ".TTX",        TYPE_REXX,
  115.     ".VLT",        TYPE_REXX,
  116.     ".CPR",        TYPE_REXX,
  117.     ".TxEd",    TYPE_REXX,
  118.     ".ADPro",    TYPE_REXX,
  119.     ".TEX",        TYPE_TEX,
  120.     ".STY",        TYPE_TEX,
  121.     ".MF",        TYPE_METAFONT,
  122.     ".MOD",        TYPE_MOD,
  123.     ".DEF",        TYPE_MOD,
  124.     ".PS",        TYPE_POSTSCRIPT,
  125.     ".GUIDE",    TYPE_AMIGAGUIDE,
  126.     ".UUE",        TYPE_UUENCODED
  127. };
  128.  
  129.     /* Some more file name suffixes for executable files and the
  130.      * approriate file types.
  131.      */
  132.  
  133. STATIC struct Suffix ExecutableSuffix[] =
  134. {
  135.     ".device",    TYPE_DEVICE,
  136.     ".library",    TYPE_LIBRARY,
  137.     "FileSystem",    TYPE_FILESYS,
  138.     "Handler",    TYPE_HANDLER
  139. };
  140.  
  141.     /* Miscellaneous magic cookies. */
  142.  
  143. STATIC STRPTR MagicCookies[] =
  144. {
  145.     "P1",
  146.     "P2",
  147.     "P3",
  148.     "P4",
  149.     "P5",
  150.     "P6",
  151.     "begin",
  152.     "xbtoa"
  153. };
  154.  
  155.     /* LongCompare(UBYTE *Buffer,ULONG Value):
  156.      *
  157.      *    Compare space in memory with a longword value.
  158.      */
  159.  
  160. STATIC BYTE __regargs
  161. LongCompare(UBYTE *Buffer,ULONG Value)
  162. {
  163.     UBYTE *OtherBuffer = (UBYTE *)&Value,i;
  164.  
  165.     for(i = 0 ; i < 4 ; i++)
  166.     {
  167.         if(OtherBuffer[i] != Buffer[i])
  168.             return(FALSE);
  169.     }
  170.  
  171.     return(TRUE);
  172. }
  173.  
  174.     /* Identify(UBYTE *Name):
  175.      *
  176.      *    Simple routine to identify a file type by looking at
  177.      *    its first 400 bytes. If successful a comment is
  178.      *    attached to the file describing the file type.
  179.      */
  180.  
  181. VOID
  182. Identify(UBYTE *Name)
  183. {
  184.     ULONG    *Buffer;
  185.     UBYTE     Type        = TYPE_FILE,
  186.         *TypeName    = NULL;
  187.     WORD     i,
  188.          Len = strlen(Name);
  189.     UBYTE     IFFType[5];
  190.  
  191.         /* Allocate a buffer for the first 410 bytes of the
  192.          * file.
  193.          */
  194.  
  195.     if(Buffer = (ULONG *)AllocVec(410,MEMF_ANY | MEMF_CLEAR))
  196.     {
  197.         BPTR File,Size;
  198.  
  199.             /* Open the file. */
  200.  
  201.         if(File = Open(Name,MODE_OLDFILE))
  202.         {
  203.                 /* Read the first 410 bytes. */
  204.  
  205.             if((Size = Read(File,Buffer,410)) >= sizeof(ULONG))
  206.             {
  207.                 UBYTE    *CharBuffer = (UBYTE *)Buffer;
  208.                 WORD     Count = 0;
  209.  
  210.                     /* See if it's an ASCII file. */
  211.  
  212.                 for(i = 0 ; i < Size ; i++)
  213.                 {
  214.                     if(ID_ValidTab[CharBuffer[i]])
  215.                         Count++;
  216.                     else
  217.                     {
  218.                         if(ID_InvalidTab[CharBuffer[i]])
  219.                         {
  220.                             Count = 0;
  221.  
  222.                             break;
  223.                         }
  224.                     }
  225.                 }
  226.  
  227.                     /* If more than 75% of the
  228.                      * characters in the first
  229.                      * 400 bytes are legal
  230.                      * ASCII characters this
  231.                      * file is supposed to be
  232.                      * a text file.
  233.                      */
  234.  
  235.                 if(Count > 3 * (Size / 4))
  236.                     Type = TYPE_TEXT;
  237.  
  238.                     /* Examine the first longword. */
  239.  
  240.                 if(Type == TYPE_FILE)
  241.                 {
  242.                     switch(Buffer[0])
  243.                     {
  244.                         case 0x000003E7:Type = TYPE_OBJECT;
  245.                                 break;
  246.  
  247.                         case 0x000003F3:if(Buffer[10] == 'LSFX')
  248.                                     Type = TYPE_LHPAK;
  249.                                 else
  250.                                 {
  251.                                     if(Buffer[11] == 'SFX!')
  252.                                         Type = TYPE_LHASFX;
  253.                                     else
  254.                                         Type = TYPE_EXECUTABLE;
  255.                                 }
  256.  
  257.                                 break;
  258.  
  259.                         case 0x000003FA:Type = TYPE_LIB;
  260.                                 break;
  261.  
  262.                         case 0xF7593647:Type = TYPE_TEXFONT;
  263.                                 break;
  264.  
  265.                         case 0xF7020183:Type = TYPE_TEXDVI;
  266.                                 break;
  267.  
  268.                         case 0xF7832020:Type = TYPE_GF;
  269.                                 break;
  270.  
  271.                         case 0x504B0304:Type = TYPE_ZIP;
  272.                                 break;
  273.  
  274.                         case 0x01030107:Type = TYPE_SPARCOBJECT;
  275.                                 break;
  276.  
  277.                         case 0x8103010B:Type = TYPE_SPARCEXECUTABLE;
  278.                                 break;
  279.  
  280.                         case 0x59A66A95:Type = TYPE_SUNRASTER;
  281.                                 break;
  282.  
  283.                         case 0x1F9D902A:Type = TYPE_COMPRESSED;
  284.                                 break;
  285.  
  286.                         case 0x30373037:Type = TYPE_CPIO;
  287.                                 break;
  288.  
  289.                         case 'FLIB':    Type = TYPE_FLIB;
  290.                                 break;
  291.  
  292.                         case 'FORM':    switch(Buffer[2])
  293.                                 {
  294.                                     case 'ILBM':    Type = TYPE_ILBM;
  295.                                             break;
  296.  
  297.                                     case 'ANIM':    Type = TYPE_ANIM;
  298.                                             break;
  299.  
  300.                                     case '8SVX':    Type = TYPE_8SVX;
  301.                                             break;
  302.  
  303.                                     case 'SMUS':    Type = TYPE_SMUS;
  304.                                             break;
  305.  
  306.                                     case 'FTXT':    Type = TYPE_FTXT;
  307.                                             break;
  308.  
  309.                                     case 'PREF':    Type = TYPE_PREFS;
  310.                                             break;
  311.  
  312.                                     case 'TERM':    Type = TYPE_TERM;
  313.                                             break;
  314.  
  315.                                     case 'AVCF':    Type = TYPE_AMIGAVISION;
  316.                                             break;
  317.  
  318.                                     default:    Type = TYPE_IFF;
  319.  
  320.                                             CopyMem(&Buffer[2],IFFType,4);
  321.  
  322.                                             IFFType[4] = 0;
  323.  
  324.                                             break;
  325.                                 }
  326.  
  327.                                 break;
  328.  
  329.                         case 'IMP!':    Type = TYPE_IMPLODER;
  330.                                 break;
  331.  
  332.                         case 'PP20':    Type = TYPE_POWERPACKER;
  333.                                 break;
  334.  
  335.                         case 'DMS!':    Type = TYPE_DMS;
  336.                                 break;
  337.  
  338.                         case 'Warp':    Type = TYPE_WARP;
  339.                                 break;
  340.  
  341.                         case 'ZOM5':
  342.                         case 'ZOOM':    Type = TYPE_ZOOM;
  343.                                 break;
  344.  
  345.                         case 'ZOO ':    Type = TYPE_ZOO;
  346.                                 break;
  347.  
  348.                         case 'GIF8':    Type = TYPE_GIF;
  349.                                 break;
  350.  
  351.                         default:    break;
  352.                     }
  353.                 }
  354.  
  355.                     /* Now for oddly placed magic cookies... */
  356.  
  357.                 if(Type == TYPE_FILE)
  358.                 {
  359.                         /* Dumb check for PCX (awful header -- just
  360.                          * a single byte indicates that the file
  361.                          * is supposed to be a PCX file! Those
  362.                          * PC guys just don't have any
  363.                          * decent software culture!).
  364.                          */
  365.  
  366.                     if(CharBuffer[0] == 0x0A)
  367.                         Type = TYPE_PCX;
  368.  
  369.                         /* Yet another awful file format... */
  370.  
  371.                     if(CharBuffer[0] == 'B' && CharBuffer[1] == 'M')
  372.                         Type = TYPE_BMP;
  373.  
  374.                         /* Check for JFIF... */
  375.  
  376.                     if(LongCompare(&CharBuffer[6],'JFIF'))
  377.                         Type = TYPE_JFIF;
  378.  
  379.                         /* Check for `freeze' output file. */
  380.  
  381.                     if(CharBuffer[0] == (UBYTE)'\037' && CharBuffer[1] >= (UBYTE)'\236')
  382.                         Type = TYPE_FREEZE;
  383.                 }
  384.  
  385.                     /* Check for Macintosh data (note:
  386.                      * this code assumes that the Mac
  387.                      * binary header is still present,
  388.                      * so if you are dealing with stripped
  389.                      * binary files, don't expect the
  390.                      * following code to work!).
  391.                      */
  392.  
  393.                 if(Type == TYPE_FILE)
  394.                 {
  395.                     UBYTE *ByteBuffer = &((UBYTE *)Buffer)[65];
  396.  
  397.                         /* Check for MacPaint... */
  398.  
  399.                     if(LongCompare(ByteBuffer,'PNTG'))
  400.                         Type = TYPE_MACPAINT;
  401.  
  402.                         /* Check for SuperPaint... */
  403.  
  404.                     if(LongCompare(ByteBuffer,'SPTG'))
  405.                         Type = TYPE_SUPERPAINT;
  406.  
  407.                         /* Check for PICT... */
  408.  
  409.                     if(LongCompare(ByteBuffer,'PICT'))
  410.                         Type = TYPE_PICT;
  411.  
  412.                         /* Check for executable... */
  413.  
  414.                     if(LongCompare(ByteBuffer,'APPL') || LongCompare(ByteBuffer,'PRES') || LongCompare(ByteBuffer,'FDOC') || LongCompare(ByteBuffer,'cdev') || LongCompare(ByteBuffer,'INIT'))
  415.                         Type = TYPE_MACEXECUTABLE;
  416.  
  417.                         /* Check for StuffIt archive... */
  418.  
  419.                     if(LongCompare(ByteBuffer,'SIT!') || LongCompare(ByteBuffer,'SIT2'))
  420.                         Type = TYPE_STUFFIT;
  421.  
  422.                         /* Check for PackIt archive... */
  423.  
  424.                     if(LongCompare(ByteBuffer,'PIT '))
  425.                         Type = TYPE_PACKIT;
  426.  
  427.                         /* Check for self-extracting Compact archive. */
  428.  
  429.                     if(LongCompare(ByteBuffer,'APPL') && LongCompare(&ByteBuffer[4],'EXTR'))
  430.                         Type = TYPE_COMPACT;
  431.  
  432.                         /* Check for MacCompress archive. */
  433.  
  434.                     if(LongCompare(ByteBuffer,'ZIVM'))
  435.                         Type = TYPE_MACCOMPRESS;
  436.  
  437.                         /* Check for LhArc archive with MacBinary header. */
  438.  
  439.                     if(LongCompare(ByteBuffer,'LARC'))
  440.                         Type = TYPE_LHARC;
  441.  
  442.                         /* Check for Compact archive. */
  443.  
  444.                     if(LongCompare(ByteBuffer,'PACT'))
  445.                         Type = TYPE_COMPACT;
  446.  
  447.                         /* Check for Diamond archive. */
  448.  
  449.                     if(LongCompare(ByteBuffer,'Pack'))
  450.                         Type = TYPE_DIAMOND;
  451.                 }
  452.  
  453.                     /* Still no match? Have another try... */
  454.  
  455.                 if(Type == TYPE_FILE)
  456.                 {
  457.                     if((Buffer[0] & 0x0000FFFF) == 0x00002D6C && (Buffer[1] & 0xFF00FF00) == 0x68002D00)
  458.                     {
  459.                         if(CharBuffer[5] == '5')
  460.                             Type = TYPE_LHA;
  461.                         else
  462.                             Type = TYPE_LHARC;
  463.                     }
  464.                     else
  465.                     {
  466.                         switch(Buffer[0] & 0xFFFF0000)
  467.                         {
  468.                             case 0x4D4D0000:
  469.                             case 0x49490000:    Type = TYPE_TIFF;
  470.                                         break;
  471.  
  472.                             case 0x1A080000:    Type = TYPE_ARC;
  473.                                         break;
  474.  
  475.                             case 0xEA600000:    Type = TYPE_ARJ;
  476.                                         break;
  477.  
  478.                             case 0x434A0000:    Type = TYPE_NEWMANX;
  479.                                         break;
  480.  
  481.                             case 0x414A0000:    Type = TYPE_OLDMANX;
  482.                                         break;
  483.  
  484.                             case 0x636A0000:    Type = TYPE_NEWMANXLIB;
  485.                                         break;
  486.  
  487.                             case 0x616A0000:    Type = TYPE_OLDMANXLIB;
  488.                                         break;
  489.  
  490.                             case 0xF5000000:    Type = TYPE_BASIC;
  491.                                         break;
  492.  
  493.                             case 0xE3100000:    Type = TYPE_ICON;
  494.                                         break;
  495.  
  496.                             case 0x4D5A0000:    Type = TYPE_MSDOSEXECUTABLE;
  497.                                         break;
  498.  
  499.                             case 0x601A0000:    Type = TYPE_ATARIEXECUTABLE;
  500.                                         break;
  501.  
  502.                             case 0x80000000:    Type = TYPE_DEGAS;
  503.                                         break;
  504.  
  505.                             default:        break;
  506.                         }
  507.                     }
  508.                 }
  509.  
  510.                     /* Take a look at the file name
  511.                      * suffixes.
  512.                      */
  513.  
  514.                 switch(Type)
  515.                 {
  516.                     case TYPE_TEXT:
  517.  
  518.                             for(i = 0 ; i < sizeof(TextSuffix) / sizeof(struct Suffix) ; i++)
  519.                             {
  520.                                 Size = strlen(TextSuffix[i] . Name);
  521.  
  522.                                 if(Len >= Size)
  523.                                 {
  524.                                     if(!Stricmp(&Name[Len - Size],TextSuffix[i] . Name))
  525.                                     {
  526.                                         Type = TextSuffix[i] . Type;
  527.                                         break;
  528.                                     }
  529.                                 }
  530.                             }
  531.  
  532.                                 /* Is it still a text file? */
  533.  
  534.                             if(Type == TYPE_TEXT)
  535.                             {
  536.                                     /* Check for magic cookies. */
  537.  
  538.                                 for(i = 0 ; i < sizeof(MagicCookies) / sizeof(STRPTR) ; i++)
  539.                                 {
  540.                                     if(!memcmp(CharBuffer,MagicCookies[i],strlen(MagicCookies[i])))
  541.                                     {
  542.                                         TypeName = LocaleString(MSG_IDENTIFY_COOKIE_0 + i);
  543.  
  544.                                         break;
  545.                                     }
  546.                                 }
  547.                             }
  548.  
  549.                             break;
  550.  
  551.                     case TYPE_EXECUTABLE:
  552.  
  553.                             for(i = 0 ; i < sizeof(ExecutableSuffix) / sizeof(struct Suffix) ; i++)
  554.                             {
  555.                                 Size = strlen(ExecutableSuffix[i] . Name);
  556.  
  557.                                 if(Len >= Size)
  558.                                 {
  559.                                     if(!Stricmp(&Name[Len - Size],ExecutableSuffix[i] . Name))
  560.                                     {
  561.                                         Type = ExecutableSuffix[i] . Type;
  562.                                         break;
  563.                                     }
  564.                                 }
  565.                             }
  566.  
  567.                             break;
  568.  
  569.                     case TYPE_OBJECT:
  570.  
  571.                             if(Len >= 4)
  572.                             {
  573.                                 if(!Stricmp(&Name[Len - 4],".LIB"))
  574.                                     Type = TYPE_LIB;
  575.                             }
  576.  
  577.                             break;
  578.  
  579.                     default:    break;
  580.                 }
  581.             }
  582.  
  583.             Close(File);
  584.         }
  585.  
  586.         FreeVec(Buffer);
  587.     }
  588.  
  589.     if(Type > TYPE_FILE || TypeName)
  590.     {
  591.         if(Type == TYPE_IFF)
  592.         {
  593.             UBYTE NameBuffer[40];
  594.  
  595.             SPrintf(NameBuffer,LocaleString(MSG_IDENTIFY_IFF_FILE),IFFType);
  596.  
  597.             SetComment(Name,NameBuffer);
  598.         }
  599.         else
  600.         {
  601.             if(TypeName)
  602.                 SetComment(Name,TypeName);
  603.             else
  604.                 SetComment(Name,LocaleString(MSG_IDENTIFY_FILETYPE_0 + Type - TYPE_ICON));
  605.         }
  606.     }
  607.  
  608.     if(Type != TYPE_EXECUTABLE && Type != TYPE_LHPAK && Type != TYPE_LHASFX)
  609.         SetProtection(Name,FIBF_EXECUTE);
  610. }
  611.