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C/C++ Source or Header  |  1995-06-17  |  19KB  |  1,003 lines
  1. /*
  2. **    termIdentify.c
  3. **
  4. **    Heuristic file type identification routines (big words!).
  5. **
  6. **    Copyright © 1990-1995 by Olaf `Olsen' Barthel
  7. **        All Rights Reserved
  8. */
  9.  
  10. #include "termGlobal.h"
  11.  
  12.     /* The file types we know. */
  13.  
  14. enum    {    TYPE_DIR,TYPE_FILE,
  15.         TYPE_ICON,
  16.         TYPE_TEXT,
  17.         TYPE_C,TYPE_H,
  18.         TYPE_ASM,TYPE_I,
  19.         TYPE_MOD,
  20.         TYPE_REXX,
  21.         TYPE_BASIC,
  22.         TYPE_AMIGAGUIDE,
  23.         TYPE_TEX,TYPE_METAFONT,TYPE_GF,TYPE_TEXFONT,TYPE_TEXDVI,TYPE_FLIB,
  24.         TYPE_OLDMANX,TYPE_NEWMANX,TYPE_OLDMANXLIB,TYPE_NEWMANXLIB,
  25.         TYPE_OBJECT,TYPE_LIB,
  26.         TYPE_EXECUTABLE,
  27.         TYPE_LIBRARY,TYPE_DEVICE,TYPE_FILESYS,TYPE_HANDLER,
  28.         TYPE_GIF,TYPE_DEGAS,TYPE_MACPAINT,TYPE_SUPERPAINT,TYPE_PICT,TYPE_SUNRASTER,TYPE_POSTSCRIPT,TYPE_PCX,TYPE_TIFF,TYPE_BMP,TYPE_JFIF,TYPE_ILBM,
  29.         TYPE_ANIM,TYPE_8SVX,TYPE_SMUS,TYPE_FTXT,TYPE_PREFS,TYPE_TERM,TYPE_AMIGAVISION,TYPE_IFF,
  30.         TYPE_IMPLODER,TYPE_POWERPACKER,TYPE_LHPAK,TYPE_LHASFX,
  31.         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,
  32.         TYPE_SPARCOBJECT,TYPE_SPARCEXECUTABLE,
  33.         TYPE_MSDOSEXECUTABLE,
  34.         TYPE_ATARIEXECUTABLE,
  35.         TYPE_MACEXECUTABLE,
  36.         TYPE_CDAF,TYPE_XPK,
  37.         TYPE_PNG,TYPE_LZX,
  38.  
  39.         TYPE_COUNT
  40.     };
  41.  
  42.     // Locale string IDs for the file types
  43.  
  44. UWORD TypeID[TYPE_COUNT] =
  45. {
  46.     MSG_IDENTIFY_FILETYPE_0,
  47.     MSG_IDENTIFY_FILETYPE_1,
  48.     MSG_IDENTIFY_FILETYPE_2,
  49.     MSG_IDENTIFY_FILETYPE_3,
  50.     MSG_IDENTIFY_FILETYPE_4,
  51.     MSG_IDENTIFY_FILETYPE_5,
  52.     MSG_IDENTIFY_FILETYPE_6,
  53.     MSG_IDENTIFY_FILETYPE_7,
  54.     MSG_IDENTIFY_FILETYPE_8,
  55.     MSG_IDENTIFY_FILETYPE_9,
  56.     MSG_IDENTIFY_FILETYPE_10,
  57.     MSG_IDENTIFY_FILETYPE_11,
  58.     MSG_IDENTIFY_FILETYPE_12,
  59.     MSG_IDENTIFY_FILETYPE_13,
  60.     MSG_IDENTIFY_FILETYPE_14,
  61.     MSG_IDENTIFY_FILETYPE_15,
  62.     MSG_IDENTIFY_FILETYPE_16,
  63.     MSG_IDENTIFY_FILETYPE_17,
  64.     MSG_IDENTIFY_FILETYPE_18,
  65.     MSG_IDENTIFY_FILETYPE_19,
  66.     MSG_IDENTIFY_FILETYPE_20,
  67.     MSG_IDENTIFY_FILETYPE_21,
  68.     MSG_IDENTIFY_FILETYPE_22,
  69.     MSG_IDENTIFY_FILETYPE_23,
  70.     MSG_IDENTIFY_FILETYPE_24,
  71.     MSG_IDENTIFY_FILETYPE_25,
  72.     MSG_IDENTIFY_FILETYPE_26,
  73.     MSG_IDENTIFY_FILETYPE_27,
  74.     MSG_IDENTIFY_FILETYPE_28,
  75.     MSG_IDENTIFY_FILETYPE_29,
  76.     MSG_IDENTIFY_FILETYPE_30,
  77.     MSG_IDENTIFY_FILETYPE_31,
  78.     MSG_IDENTIFY_FILETYPE_32,
  79.     MSG_IDENTIFY_FILETYPE_33,
  80.     MSG_IDENTIFY_FILETYPE_34,
  81.     MSG_IDENTIFY_FILETYPE_35,
  82.     MSG_IDENTIFY_FILETYPE_36,
  83.     MSG_IDENTIFY_FILETYPE_37,
  84.     MSG_IDENTIFY_FILETYPE_38,
  85.     MSG_IDENTIFY_FILETYPE_39,
  86.     MSG_IDENTIFY_FILETYPE_40,
  87.     MSG_IDENTIFY_FILETYPE_41,
  88.     MSG_IDENTIFY_FILETYPE_42,
  89.     MSG_IDENTIFY_FILETYPE_43,
  90.     MSG_IDENTIFY_FILETYPE_44,
  91.     MSG_IDENTIFY_FILETYPE_45,
  92.     MSG_IDENTIFY_FILETYPE_46,
  93.     MSG_IDENTIFY_FILETYPE_47,
  94.     MSG_IDENTIFY_FILETYPE_48,
  95.     MSG_IDENTIFY_FILETYPE_49,
  96.     MSG_IDENTIFY_FILETYPE_50,
  97.     MSG_IDENTIFY_FILETYPE_51,
  98.     MSG_IDENTIFY_FILETYPE_52,
  99.     MSG_IDENTIFY_FILETYPE_53,
  100.     MSG_IDENTIFY_FILETYPE_54,
  101.     MSG_IDENTIFY_FILETYPE_55,
  102.     MSG_IDENTIFY_FILETYPE_56,
  103.     MSG_IDENTIFY_FILETYPE_57,
  104.     MSG_IDENTIFY_FILETYPE_58,
  105.     MSG_IDENTIFY_FILETYPE_59,
  106.     MSG_IDENTIFY_FILETYPE_60,
  107.     MSG_IDENTIFY_FILETYPE_61,
  108.     MSG_IDENTIFY_FILETYPE_62,
  109.     MSG_IDENTIFY_FILETYPE_63,
  110.     MSG_IDENTIFY_FILETYPE_64,
  111.     MSG_IDENTIFY_FILETYPE_65,
  112.     MSG_IDENTIFY_FILETYPE_66,
  113.     MSG_IDENTIFY_FILETYPE_67,
  114.     MSG_IDENTIFY_FILETYPE_68,
  115.     MSG_IDENTIFY_FILETYPE_69,
  116.     MSG_IDENTIFY_FILETYPE_70,
  117.     MSG_IDENTIFY_FILETYPE_71,
  118.     MSG_IDENTIFY_FILETYPE_72,
  119.     MSG_IDENTIFY_FILETYPE_73,
  120.     MSG_IDENTIFY_CDAF,
  121.     MSG_IDENTIFY_XPK,
  122.     MSG_IDENTIFY_FILETYPE_74,
  123.     MSG_IDENTIFY_FILETYPE_75
  124. };
  125.  
  126.     /* File type/class mappings. */
  127.  
  128. STATIC WORD FileTypes[TYPE_COUNT] =
  129. {
  130.     FILETYPE_DIR,
  131.     FILETYPE_FILE,
  132.     FILETYPE_NONE,
  133.     FILETYPE_TEXT,
  134.     FILETYPE_TEXT,
  135.     FILETYPE_TEXT,
  136.     FILETYPE_TEXT,
  137.     FILETYPE_TEXT,
  138.     FILETYPE_TEXT,
  139.     FILETYPE_TEXT,
  140.     FILETYPE_TEXT,
  141.     FILETYPE_TEXT,
  142.     FILETYPE_TEXT,
  143.     FILETYPE_FILE,
  144.     FILETYPE_FILE,
  145.     FILETYPE_FILE,
  146.     FILETYPE_FILE,
  147.     FILETYPE_FILE,
  148.     FILETYPE_FILE,
  149.     FILETYPE_FILE,
  150.     FILETYPE_FILE,
  151.     FILETYPE_FILE,
  152.     FILETYPE_FILE,
  153.     FILETYPE_FILE,
  154.     FILETYPE_PROGRAM,
  155.     FILETYPE_FILE,
  156.     FILETYPE_FILE,
  157.     FILETYPE_FILE,
  158.     FILETYPE_FILE,
  159.     FILETYPE_PICTURE,
  160.     FILETYPE_PICTURE,
  161.     FILETYPE_PICTURE,
  162.     FILETYPE_PICTURE,
  163.     FILETYPE_PICTURE,
  164.     FILETYPE_PICTURE,
  165.     FILETYPE_PICTURE,
  166.     FILETYPE_PICTURE,
  167.     FILETYPE_PICTURE,
  168.     FILETYPE_PICTURE,
  169.     FILETYPE_PICTURE,
  170.     FILETYPE_PICTURE,
  171.     FILETYPE_PICTURE,
  172.     FILETYPE_SOUND,
  173.     FILETYPE_SOUND,
  174.     FILETYPE_TEXT,
  175.     FILETYPE_PREFS,
  176.     FILETYPE_PREFS,
  177.     FILETYPE_FILE,
  178.     FILETYPE_FILE,
  179.     FILETYPE_ARCHIVE,
  180.     FILETYPE_ARCHIVE,
  181.     FILETYPE_ARCHIVE,
  182.     FILETYPE_ARCHIVE,
  183.     FILETYPE_ARCHIVE,
  184.     FILETYPE_ARCHIVE,
  185.     FILETYPE_ARCHIVE,
  186.     FILETYPE_ARCHIVE,
  187.     FILETYPE_TEXT,
  188.     FILETYPE_ARCHIVE,
  189.     FILETYPE_ARCHIVE,
  190.     FILETYPE_ARCHIVE,
  191.     FILETYPE_ARCHIVE,
  192.     FILETYPE_ARCHIVE,
  193.     FILETYPE_ARCHIVE,
  194.     FILETYPE_ARCHIVE,
  195.     FILETYPE_ARCHIVE,
  196.     FILETYPE_ARCHIVE,
  197.     FILETYPE_ARCHIVE,
  198.     FILETYPE_ARCHIVE,
  199.     FILETYPE_ARCHIVE,
  200.     FILETYPE_ARCHIVE,
  201.     FILETYPE_PROGRAM,
  202.     FILETYPE_PROGRAM,
  203.     FILETYPE_PROGRAM,
  204.     FILETYPE_PROGRAM,
  205.     FILETYPE_PROGRAM,
  206.     FILETYPE_ARCHIVE,
  207.     FILETYPE_ARCHIVE,
  208.     FILETYPE_PICTURE,
  209.     FILETYPE_ARCHIVE
  210. };
  211.  
  212.     /* File class icon names. */
  213.  
  214. STATIC STRPTR ClassIconNames[FILETYPE_COUNT] =
  215. {
  216.     NULL,
  217.     "ENV:sys/def_drawer",
  218.     "ENV:sys/def_project",
  219.     "ENV:sys/def_text",
  220.     "ENV:sys/def_sound",
  221.     "ENV:sys/def_picture",
  222.     "ENV:sys/def_pref",
  223.     "ENV:sys/def_archive",
  224.     "ENV:sys/def_tool",
  225. };
  226.  
  227.     /* A structure containing both a file name suffix and the
  228.      * approriate file type.
  229.      */
  230.  
  231. struct Suffix
  232. {
  233.     UBYTE    *Name;
  234.     UBYTE     Type;
  235. };
  236.  
  237.     /* A table of valid ASCII characters (7 bits). */
  238.  
  239. STATIC BYTE ID_ValidTab[256] =
  240. {
  241.     0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,
  242.     0,1,0,1,0,0,0,0,0,0,0,1,0,0,0,0,
  243.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  244.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  245.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  246.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  247.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  248.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  249.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  250.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  251.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  252.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  253.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  254.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  255.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  256.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  257. };
  258.  
  259.     /* A table of clearly invalid ASCII characters (8 bits). */
  260.  
  261. STATIC BYTE ID_InvalidTab[256] =
  262. {
  263.     1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,
  264.     1,0,1,0,1,1,1,1,1,1,1,0,1,1,1,1,
  265.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  266.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  267.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  268.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  269.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  270.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  271.     1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
  272.     1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
  273.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  274.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  275.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  276.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  277.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  278.     0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
  279. };
  280.  
  281.     /* Some file name suffixes for text files and the approriate
  282.      * file types.
  283.      */
  284.  
  285. STATIC struct Suffix TextSuffix[] =
  286. {
  287.     ".C",        TYPE_C,
  288.     ".CPP",        TYPE_C,
  289.     ".CXX",        TYPE_C,
  290.     ".C++",        TYPE_C,
  291.     ".CC",        TYPE_C,
  292.     ".H",        TYPE_H,
  293.     ".ASM",        TYPE_ASM,
  294.     ".A",        TYPE_ASM,
  295.     ".S",        TYPE_ASM,
  296.     ".I",        TYPE_I,
  297.     ".BAS",        TYPE_BASIC,
  298.     ".GFA",        TYPE_BASIC,
  299.     ".REXX",    TYPE_REXX,
  300.     ".CED",        TYPE_REXX,
  301.     ".TTX",        TYPE_REXX,
  302.     ".VLT",        TYPE_REXX,
  303.     ".CPR",        TYPE_REXX,
  304.     ".TxEd",    TYPE_REXX,
  305.     ".ADPro",    TYPE_REXX,
  306.     ".TEX",        TYPE_TEX,
  307.     ".STY",        TYPE_TEX,
  308.     ".MF",        TYPE_METAFONT,
  309.     ".MOD",        TYPE_MOD,
  310.     ".DEF",        TYPE_MOD,
  311.     ".PS",        TYPE_POSTSCRIPT,
  312.     ".GUIDE",    TYPE_AMIGAGUIDE,
  313.     ".UUE",        TYPE_UUENCODED
  314. };
  315.  
  316.     /* Some more file name suffixes for executable files and the
  317.      * approriate file types.
  318.      */
  319.  
  320. STATIC struct Suffix ExecutableSuffix[] =
  321. {
  322.     ".device",    TYPE_DEVICE,
  323.     ".library",    TYPE_LIBRARY,
  324.     "FileSystem",    TYPE_FILESYS,
  325.     "Handler",    TYPE_HANDLER
  326. };
  327.  
  328.     /* Miscellaneous magic cookies. */
  329.  
  330. STATIC STRPTR MagicCookies[] =
  331. {
  332.     "P1",
  333.     "P2",
  334.     "P3",
  335.     "P4",
  336.     "P5",
  337.     "P6",
  338.     "begin",
  339.     "xbtoa"
  340. };
  341.  
  342.     /* LongCompare(UBYTE *Buffer,ULONG Value):
  343.      *
  344.      *    Compare space in memory with a longword value.
  345.      */
  346.  
  347. STATIC BYTE __regargs
  348. LongCompare(UBYTE *Buffer,ULONG Value)
  349. {
  350.     UBYTE *OtherBuffer = (UBYTE *)&Value,i;
  351.  
  352.     for(i = 0 ; i < 4 ; i++)
  353.     {
  354.         if(OtherBuffer[i] != Buffer[i])
  355.             return(FALSE);
  356.     }
  357.  
  358.     return(TRUE);
  359. }
  360.  
  361.     /* GetFileType(STRPTR Name,BYTE AttachComment):
  362.      *
  363.      *    Simple routine to identify a file type by looking at
  364.      *    its first 400 bytes. If successful a comment is
  365.      *    attached to the file describing the file type.
  366.      */
  367.  
  368. WORD __regargs
  369. GetFileType(STRPTR Name,BYTE AttachComment)
  370. {
  371.     ULONG    *Buffer;
  372.     UBYTE     Type        = TYPE_FILE,
  373.         *TypeName    = NULL;
  374.     WORD     i,
  375.          Len = strlen(Name);
  376.     UBYTE     IFFType[5];
  377.  
  378.         /* Allocate a buffer for the first 410 bytes of the
  379.          * file.
  380.          */
  381.  
  382.     if(Buffer = (ULONG *)AllocVecPooled(410,MEMF_ANY | MEMF_CLEAR))
  383.     {
  384.         BPTR File,Size;
  385.  
  386.             /* Open the file. */
  387.  
  388.         if(File = Open(Name,MODE_OLDFILE))
  389.         {
  390.                 /* Read the first 410 bytes. */
  391.  
  392.             if((Size = Read(File,Buffer,410)) >= sizeof(ULONG))
  393.             {
  394.                 UBYTE    *CharBuffer = (UBYTE *)Buffer;
  395.                 WORD     Count = 0;
  396.  
  397.                     /* See if it's an ASCII file. */
  398.  
  399.                 for(i = 0 ; i < Size ; i++)
  400.                 {
  401.                     if(ID_ValidTab[CharBuffer[i]])
  402.                         Count++;
  403.                     else
  404.                     {
  405.                         if(ID_InvalidTab[CharBuffer[i]])
  406.                         {
  407.                             Count = 0;
  408.  
  409.                             break;
  410.                         }
  411.                     }
  412.                 }
  413.  
  414.                     /* If more than 75% of the
  415.                      * characters in the first
  416.                      * 400 bytes are legal
  417.                      * ASCII characters this
  418.                      * file is supposed to be
  419.                      * a text file.
  420.                      */
  421.  
  422.                 if(Count > 3 * (Size / 4))
  423.                     Type = TYPE_TEXT;
  424.  
  425.                     /* Examine the first longword. */
  426.  
  427.                 if(Type == TYPE_FILE)
  428.                 {
  429.                     switch(Buffer[0])
  430.                     {
  431.                         case 0x4C5A5800:
  432.  
  433.                             Type = TYPE_LZX;
  434.                             break;
  435.  
  436.                         case 0x58504B46:
  437.  
  438.                             Type = TYPE_XPK;
  439.                             break;
  440.  
  441.                         case 0x000003E7:
  442.  
  443.                             Type = TYPE_OBJECT;
  444.                             break;
  445.  
  446.                         case 0x000003F3:
  447.  
  448.                             if(Buffer[10] == 'LSFX')
  449.                                 Type = TYPE_LHPAK;
  450.                             else
  451.                             {
  452.                                 if(Buffer[11] == 'SFX!')
  453.                                     Type = TYPE_LHASFX;
  454.                                 else
  455.                                     Type = TYPE_EXECUTABLE;
  456.                             }
  457.  
  458.                             break;
  459.  
  460.                         case 0x000003FA:
  461.  
  462.                             Type = TYPE_LIB;
  463.                             break;
  464.  
  465.                         case 0xF7593647:
  466.  
  467.                             Type = TYPE_TEXFONT;
  468.                             break;
  469.  
  470.                         case 0xF7020183:
  471.  
  472.                             Type = TYPE_TEXDVI;
  473.                             break;
  474.  
  475.                         case 0xF7832020:
  476.  
  477.                             Type = TYPE_GF;
  478.                             break;
  479.  
  480.                         case 0x504B0304:
  481.  
  482.                             Type = TYPE_ZIP;
  483.                             break;
  484.  
  485.                         case 0x01030107:
  486.  
  487.                             Type = TYPE_SPARCOBJECT;
  488.                             break;
  489.  
  490.                         case 0x8103010B:
  491.  
  492.                             Type = TYPE_SPARCEXECUTABLE;
  493.                             break;
  494.  
  495.                         case 0x59A66A95:
  496.  
  497.                             Type = TYPE_SUNRASTER;
  498.                             break;
  499.  
  500.                         case 0x1F9D902A:
  501.  
  502.                             Type = TYPE_COMPRESSED;
  503.                             break;
  504.  
  505.                         case 0x30373037:
  506.  
  507.                             Type = TYPE_CPIO;
  508.                             break;
  509.  
  510.                         case 'FLIB':
  511.  
  512.                             Type = TYPE_FLIB;
  513.                             break;
  514.  
  515.                         case '\211PNG':
  516.  
  517.                             Type = TYPE_PNG;
  518.                             break;
  519.  
  520.                         case 'FORM':
  521.  
  522.                             switch(Buffer[2])
  523.                             {
  524.                                 case 'ILBM':
  525.  
  526.                                     Type = TYPE_ILBM;
  527.                                     break;
  528.  
  529.                                 case 'ANIM':
  530.  
  531.                                     Type = TYPE_ANIM;
  532.                                     break;
  533.  
  534.                                 case '8SVX':
  535.  
  536.                                     Type = TYPE_8SVX;
  537.                                     break;
  538.  
  539.                                 case 'SMUS':
  540.  
  541.                                     Type = TYPE_SMUS;
  542.                                     break;
  543.  
  544.                                 case 'FTXT':
  545.  
  546.                                     Type = TYPE_FTXT;
  547.                                     break;
  548.  
  549.                                 case 'PREF':
  550.  
  551.                                     Type = TYPE_PREFS;
  552.                                     break;
  553.  
  554.                                 case 'TERM':
  555.  
  556.                                     Type = TYPE_TERM;
  557.                                     break;
  558.  
  559.                                 case 'AVCF':
  560.  
  561.                                     Type = TYPE_AMIGAVISION;
  562.                                     break;
  563.  
  564.                                 case 'CDAF':
  565.  
  566.                                     Type = TYPE_CDAF;
  567.                                     break;
  568.  
  569.                                 default:
  570.  
  571.                                     Type = TYPE_IFF;
  572.  
  573.                                     CopyMem(&Buffer[2],IFFType,4);
  574.  
  575.                                     IFFType[4] = 0;
  576.  
  577.                                     break;
  578.                             }
  579.  
  580.                             break;
  581.  
  582.                         case 'IMP!':
  583.  
  584.                             Type = TYPE_IMPLODER;
  585.                             break;
  586.  
  587.                         case 'PP20':
  588.  
  589.                             Type = TYPE_POWERPACKER;
  590.                             break;
  591.  
  592.                         case 'DMS!':
  593.  
  594.                             Type = TYPE_DMS;
  595.                             break;
  596.  
  597.                         case 'Warp':
  598.  
  599.                             Type = TYPE_WARP;
  600.                             break;
  601.  
  602.                         case 'ZOM5':
  603.                         case 'ZOOM':
  604.  
  605.                             Type = TYPE_ZOOM;
  606.                             break;
  607.  
  608.                         case 'ZOO ':
  609.  
  610.                             Type = TYPE_ZOO;
  611.                             break;
  612.  
  613.                         case 'GIF8':
  614.  
  615.                             Type = TYPE_GIF;
  616.                             break;
  617.                     }
  618.                 }
  619.  
  620.                     /* Now for oddly placed magic cookies... */
  621.  
  622.                 if(Type == TYPE_FILE)
  623.                 {
  624.                         /* Dumb check for PCX (awful header -- just
  625.                          * a single byte indicates that the file
  626.                          * is supposed to be a PCX file! Those
  627.                          * PC guys just don't have any
  628.                          * decent software culture!).
  629.                          */
  630.  
  631.                     if(CharBuffer[0] == 0x0A)
  632.                         Type = TYPE_PCX;
  633.  
  634.                         /* Yet another awful file format... */
  635.  
  636.                     if(CharBuffer[0] == 'B' && CharBuffer[1] == 'M')
  637.                         Type = TYPE_BMP;
  638.  
  639.                         /* Check for JFIF... */
  640.  
  641.                     if(LongCompare(&CharBuffer[6],'JFIF'))
  642.                         Type = TYPE_JFIF;
  643.  
  644.                         /* Check for `freeze' output file. */
  645.  
  646.                     if(CharBuffer[0] == (UBYTE)'\037' && CharBuffer[1] >= (UBYTE)'\236')
  647.                         Type = TYPE_FREEZE;
  648.                 }
  649.  
  650.                     /* Check for Macintosh data (note:
  651.                      * this code assumes that the Mac
  652.                      * binary header is still present,
  653.                      * so if you are dealing with stripped
  654.                      * binary files, don't expect the
  655.                      * following code to work!).
  656.                      */
  657.  
  658.                 if(Type == TYPE_FILE)
  659.                 {
  660.                     UBYTE *ByteBuffer = &((UBYTE *)Buffer)[65];
  661.  
  662.                         /* Check for MacPaint... */
  663.  
  664.                     if(LongCompare(ByteBuffer,'PNTG'))
  665.                         Type = TYPE_MACPAINT;
  666.  
  667.                         /* Check for SuperPaint... */
  668.  
  669.                     if(LongCompare(ByteBuffer,'SPTG'))
  670.                         Type = TYPE_SUPERPAINT;
  671.  
  672.                         /* Check for PICT... */
  673.  
  674.                     if(LongCompare(ByteBuffer,'PICT'))
  675.                         Type = TYPE_PICT;
  676.  
  677.                         /* Check for executable... */
  678.  
  679.                     if(LongCompare(ByteBuffer,'APPL') || LongCompare(ByteBuffer,'PRES') || LongCompare(ByteBuffer,'FDOC') || LongCompare(ByteBuffer,'cdev') || LongCompare(ByteBuffer,'INIT'))
  680.                         Type = TYPE_MACEXECUTABLE;
  681.  
  682.                         /* Check for StuffIt archive... */
  683.  
  684.                     if(LongCompare(ByteBuffer,'SIT!') || LongCompare(ByteBuffer,'SIT2'))
  685.                         Type = TYPE_STUFFIT;
  686.  
  687.                         /* Check for PackIt archive... */
  688.  
  689.                     if(LongCompare(ByteBuffer,'PIT '))
  690.                         Type = TYPE_PACKIT;
  691.  
  692.                         /* Check for self-extracting Compact archive. */
  693.  
  694.                     if(LongCompare(ByteBuffer,'APPL') && LongCompare(&ByteBuffer[4],'EXTR'))
  695.                         Type = TYPE_COMPACT;
  696.  
  697.                         /* Check for MacCompress archive. */
  698.  
  699.                     if(LongCompare(ByteBuffer,'ZIVM'))
  700.                         Type = TYPE_MACCOMPRESS;
  701.  
  702.                         /* Check for LhArc archive with MacBinary header. */
  703.  
  704.                     if(LongCompare(ByteBuffer,'LARC'))
  705.                         Type = TYPE_LHARC;
  706.  
  707.                         /* Check for Compact archive. */
  708.  
  709.                     if(LongCompare(ByteBuffer,'PACT'))
  710.                         Type = TYPE_COMPACT;
  711.  
  712.                         /* Check for Diamond archive. */
  713.  
  714.                     if(LongCompare(ByteBuffer,'Pack'))
  715.                         Type = TYPE_DIAMOND;
  716.                 }
  717.  
  718.                     /* Still no match? Have another try... */
  719.  
  720.                 if(Type == TYPE_FILE)
  721.                 {
  722.                     if((Buffer[0] & 0x0000FFFF) == 0x00002D6C && (Buffer[1] & 0xFF00FF00) == 0x68002D00)
  723.                     {
  724.                         if(CharBuffer[5] == '5')
  725.                             Type = TYPE_LHA;
  726.                         else
  727.                             Type = TYPE_LHARC;
  728.                     }
  729.                     else
  730.                     {
  731.                         switch(Buffer[0] & 0xFFFF0000)
  732.                         {
  733.                             case 0x4D4D0000:
  734.                             case 0x49490000:
  735.  
  736.                                 Type = TYPE_TIFF;
  737.                                 break;
  738.  
  739.                             case 0x1A080000:
  740.  
  741.                                 Type = TYPE_ARC;
  742.                                 break;
  743.  
  744.                             case 0x60EA0000:
  745.  
  746.                                 Type = TYPE_ARJ;
  747.                                 break;
  748.  
  749.                             case 0x434A0000:
  750.  
  751.                                 Type = TYPE_NEWMANX;
  752.                                 break;
  753.  
  754.                             case 0x414A0000:
  755.  
  756.                                 Type = TYPE_OLDMANX;
  757.                                 break;
  758.  
  759.                             case 0x636A0000:
  760.  
  761.                                 Type = TYPE_NEWMANXLIB;
  762.                                 break;
  763.  
  764.                             case 0x616A0000:
  765.  
  766.                                 Type = TYPE_OLDMANXLIB;
  767.                                 break;
  768.  
  769.                             case 0xF5000000:
  770.  
  771.                                 Type = TYPE_BASIC;
  772.                                 break;
  773.  
  774.                             case 0xE3100000:
  775.  
  776.                                 Type = TYPE_ICON;
  777.                                 break;
  778.  
  779.                             case 0x4D5A0000:
  780.  
  781.                                 Type = TYPE_MSDOSEXECUTABLE;
  782.                                 break;
  783.  
  784.                             case 0x601A0000:
  785.  
  786.                                 Type = TYPE_ATARIEXECUTABLE;
  787.                                 break;
  788.  
  789.                             case 0x80000000:
  790.  
  791.                                 Type = TYPE_DEGAS;
  792.                                 break;
  793.                         }
  794.                     }
  795.                 }
  796.  
  797.                     /* Take a look at the file name
  798.                      * suffixes.
  799.                      */
  800.  
  801.                 switch(Type)
  802.                 {
  803.                     case TYPE_TEXT:
  804.  
  805.                         for(i = 0 ; i < sizeof(TextSuffix) / sizeof(struct Suffix) ; i++)
  806.                         {
  807.                             Size = strlen(TextSuffix[i] . Name);
  808.  
  809.                             if(Len >= Size)
  810.                             {
  811.                                 if(!Stricmp(&Name[Len - Size],TextSuffix[i] . Name))
  812.                                 {
  813.                                     Type = TextSuffix[i] . Type;
  814.                                     break;
  815.                                 }
  816.                             }
  817.                         }
  818.  
  819.                             /* Is it still a text file? */
  820.  
  821.                         if(Type == TYPE_TEXT)
  822.                         {
  823.                                 /* Check for magic cookies. */
  824.  
  825.                             for(i = 0 ; i < sizeof(MagicCookies) / sizeof(STRPTR) ; i++)
  826.                             {
  827.                                 if(!memcmp(CharBuffer,MagicCookies[i],strlen(MagicCookies[i])))
  828.                                 {
  829.                                     TypeName = LocaleString(MSG_IDENTIFY_COOKIE_0 + i);
  830.  
  831.                                     break;
  832.                                 }
  833.                             }
  834.                         }
  835.  
  836.                         break;
  837.  
  838.                     case TYPE_EXECUTABLE:
  839.  
  840.                         for(i = 0 ; i < sizeof(ExecutableSuffix) / sizeof(struct Suffix) ; i++)
  841.                         {
  842.                             Size = strlen(ExecutableSuffix[i] . Name);
  843.  
  844.                             if(Len >= Size)
  845.                             {
  846.                                 if(!Stricmp(&Name[Len - Size],ExecutableSuffix[i] . Name))
  847.                                 {
  848.                                     Type = ExecutableSuffix[i] . Type;
  849.                                     break;
  850.                                 }
  851.                             }
  852.                         }
  853.  
  854.                         break;
  855.  
  856.                     case TYPE_OBJECT:
  857.  
  858.                         if(Len >= 4)
  859.                         {
  860.                             if(!Stricmp(&Name[Len - 4],".LIB"))
  861.                                 Type = TYPE_LIB;
  862.                         }
  863.  
  864.                         break;
  865.                 }
  866.             }
  867.  
  868.             Close(File);
  869.         }
  870.  
  871.         FreeVecPooled(Buffer);
  872.     }
  873.  
  874.     if(AttachComment)
  875.     {
  876.         if(Type > TYPE_FILE || TypeName)
  877.         {
  878.             if(Type == TYPE_IFF)
  879.             {
  880.                 UBYTE NameBuffer[40];
  881.  
  882.                 SPrintf(NameBuffer,LocaleString(MSG_IDENTIFY_IFF_FILE),IFFType);
  883.  
  884.                 SetComment(Name,NameBuffer);
  885.             }
  886.             else
  887.             {
  888.                 if(TypeName)
  889.                     SetComment(Name,TypeName);
  890.                 else
  891.                     SetComment(Name,LocaleString(TypeID[Type - TYPE_ICON]));
  892.             }
  893.         }
  894.  
  895.             /* Is it an executable file? */
  896.  
  897.         if(Type != TYPE_EXECUTABLE && Type != TYPE_LHPAK && Type != TYPE_LHASFX)
  898.         {
  899.             BPTR FileLock;
  900.  
  901.                 /* Get a lock on it. */
  902.  
  903.             if(FileLock = Lock(Name,ACCESS_WRITE))
  904.             {
  905.                 struct FileInfoBlock *FileInfo;
  906.  
  907.                     /* Allocate fileinfo data. */
  908.  
  909.                 if(FileInfo = (struct FileInfoBlock *)AllocDosObjectTags(DOS_FIB,TAG_DONE))
  910.                 {
  911.                         /* Take a closer look at it... */
  912.  
  913.                     if(Examine(FileLock,FileInfo))
  914.                     {
  915.                             /* Release the lock. */
  916.  
  917.                         UnLock(FileLock);
  918.  
  919.                             /* Really drop it. */
  920.  
  921.                         FileLock = NULL;
  922.  
  923.                             /* Update protection bits. */
  924.  
  925.                         SetProtection(Name,FileInfo -> fib_Protection | FIBF_EXECUTE);
  926.                     }
  927.  
  928.                         /* Free fileinfo data. */
  929.  
  930.                     FreeDosObject(DOS_FIB,FileInfo);
  931.                 }
  932.             }
  933.  
  934.                 /* Release the lock if still allocated. */
  935.  
  936.             if(FileLock)
  937.                 UnLock(FileLock);
  938.         }
  939.     }
  940.  
  941.     return(Type);
  942. }
  943.  
  944.     /* Identify(STRPTR Name):
  945.      *
  946.      *    Try to identify the type of a file,
  947.      *    attach an icon if necessary.
  948.      */
  949.  
  950. VOID __regargs
  951. Identify(STRPTR Name,BYTE AttachComment)
  952. {
  953.     WORD Type = GetFileType(Name,AttachComment);
  954.  
  955.     if(Config -> MiscConfig -> CreateIcons)
  956.         AddIcon(Name,FileTypes[Type],FALSE);
  957. }
  958.  
  959.     /* AddIcon(STRPTR Name,WORD Type,BYTE Override):
  960.      *
  961.      *    Add an icon to a file.
  962.      */
  963.  
  964. VOID __regargs
  965. AddIcon(STRPTR Name,WORD Index,BYTE Override)
  966. {
  967.     if(ClassIconNames[Index] && IconBase)
  968.     {
  969.         struct DiskObject *Icon;
  970.  
  971.         if(!Override)
  972.         {
  973.             if(Icon = GetDiskObject(Name))
  974.             {
  975.                 FreeDiskObject(Icon);
  976.  
  977.                 return;
  978.             }
  979.         }
  980.  
  981.         if(!(Icon = GetDiskObject(ClassIconNames[Index])))
  982.         {
  983.             if(Index == FILETYPE_PROGRAM)
  984.                 Icon = GetDefDiskObject(WBTOOL);
  985.             else
  986.             {
  987.                 AddProtection(Name,FIBF_EXECUTE);
  988.  
  989.                 Icon = GetDiskObjectNew(Name);
  990.             }
  991.         }
  992.  
  993.         if(Icon)
  994.         {
  995.             Icon -> do_CurrentX = Icon -> do_CurrentY = NO_ICON_POSITION;
  996.  
  997.             PutDiskObject(Name,Icon);
  998.  
  999.             FreeDiskObject(Icon);
  1000.         }
  1001.     }
  1002. }
  1003.