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  1. /*
  2.   Copyright (c) 1990-2007 Info-ZIP.  All rights reserved.
  3.  
  4.   See the accompanying file LICENSE, version 2003-May-08 or later
  5.   (the contents of which are also included in unzip.h) for terms of use.
  6.   If, for some reason, all these files are missing, the Info-ZIP license
  7.   also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
  8. */
  9. /*---------------------------------------------------------------------------
  10.  
  11.   globals.c
  12.  
  13.   Routines to allocate and initialize globals, with or without threads.
  14.  
  15.   Contents:  registerGlobalPointer()
  16.              deregisterGlobalPointer()
  17.              getGlobalPointer()
  18.              globalsCtor()
  19.  
  20.   ---------------------------------------------------------------------------*/
  21.  
  22.  
  23. #define UNZIP_INTERNAL
  24. #include "unzip.h"
  25.  
  26. #ifndef FUNZIP
  27. /* initialization of sigs is completed at runtime so unzip(sfx) executable
  28.  * won't look like a zipfile
  29.  */
  30. char central_hdr_sig[4]   = {0, 0, 0x01, 0x02};
  31. char local_hdr_sig[4]     = {0, 0, 0x03, 0x04};
  32. char end_central_sig[4]   = {0, 0, 0x05, 0x06};
  33. char end_central64_sig[4] = {0, 0, 0x06, 0x06};
  34. char end_centloc64_sig[4] = {0, 0, 0x06, 0x07};
  35. /* extern char extd_local_sig[4] = {0, 0, 0x07, 0x08};  NOT USED YET */
  36.  
  37. ZCONST char *fnames[2] = {"*", NULL};   /* default filenames vector */
  38. #endif
  39.  
  40.  
  41. #ifndef REENTRANT
  42.    Uz_Globs G;
  43. #else /* REENTRANT */
  44.  
  45. #  ifndef USETHREADID
  46.      Uz_Globs *GG;
  47. #  else /* USETHREADID */
  48. #    define THREADID_ENTRIES  0x40
  49.  
  50.      int lastScan;
  51.      Uz_Globs  *threadPtrTable[THREADID_ENTRIES];
  52.      ulg        threadIdTable [THREADID_ENTRIES] = {
  53.          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
  54.          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* Make sure there are */
  55.          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* THREADID_ENTRIES 0s */
  56.          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0
  57.      };
  58.  
  59.      static ZCONST char Far TooManyThreads[] =
  60.        "error:  more than %d simultaneous threads.\n\
  61.        Some threads are probably not calling DESTROYTHREAD()\n";
  62.      static ZCONST char Far EntryNotFound[] =
  63.        "error:  couldn't find global pointer in table.\n\
  64.        Maybe somebody accidentally called DESTROYTHREAD() twice.\n";
  65.      static ZCONST char Far GlobalPointerMismatch[] =
  66.        "error:  global pointer in table does not match pointer passed as\
  67. parameter\n";
  68.  
  69. static void registerGlobalPointer OF((__GPRO));
  70.  
  71.  
  72.  
  73. static void registerGlobalPointer(__G)
  74.     __GDEF
  75. {
  76.     int scan=0;
  77.     ulg tid = GetThreadId();
  78.  
  79.     while (threadIdTable[scan] && scan < THREADID_ENTRIES)
  80.         scan++;
  81.  
  82.     if (scan == THREADID_ENTRIES) {
  83.         ZCONST char *tooMany = LoadFarString(TooManyThreads);
  84.         Info(slide, 0x421, ((char *)slide, tooMany, THREADID_ENTRIES));
  85.         free(pG);
  86.         EXIT(PK_MEM);   /* essentially memory error before we've started */
  87.     }
  88.  
  89.     threadIdTable [scan] = tid;
  90.     threadPtrTable[scan] = pG;
  91.     lastScan = scan;
  92. }
  93.  
  94.  
  95.  
  96. void deregisterGlobalPointer(__G)
  97.     __GDEF
  98. {
  99.     int scan=0;
  100.     ulg tid = GetThreadId();
  101.  
  102.  
  103.     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
  104.         scan++;
  105.  
  106. /*---------------------------------------------------------------------------
  107.     There are two things we can do if we can't find the entry:  ignore it or
  108.     scream.  The most likely reason for it not to be here is the user calling
  109.     this routine twice.  Since this could cause BIG problems if any globals
  110.     are accessed after the first call, we'd better scream.
  111.   ---------------------------------------------------------------------------*/
  112.  
  113.     if (scan == THREADID_ENTRIES || threadPtrTable[scan] != pG) {
  114.         ZCONST char *noEntry;
  115.         if (scan == THREADID_ENTRIES)
  116.             noEntry = LoadFarString(EntryNotFound);
  117.         else
  118.             noEntry = LoadFarString(GlobalPointerMismatch);
  119.         Info(slide, 0x421, ((char *)slide, noEntry));
  120.         EXIT(PK_WARN);   /* programming error, but after we're all done */
  121.     }
  122.  
  123.     threadIdTable [scan] = 0;
  124.     lastScan = scan;
  125.     free(threadPtrTable[scan]);
  126. }
  127.  
  128.  
  129.  
  130. Uz_Globs *getGlobalPointer()
  131. {
  132.     int scan=0;
  133.     ulg tid = GetThreadId();
  134.  
  135.     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
  136.         scan++;
  137.  
  138. /*---------------------------------------------------------------------------
  139.     There are two things we can do if we can't find the entry:  ignore it or
  140.     scream.  The most likely reason for it not to be here is the user calling
  141.     this routine twice.  Since this could cause BIG problems if any globals
  142.     are accessed after the first call, we'd better scream.
  143.   ---------------------------------------------------------------------------*/
  144.  
  145.     if (scan == THREADID_ENTRIES) {
  146.         ZCONST char *noEntry = LoadFarString(EntryNotFound);
  147.         fprintf(stderr, noEntry);  /* can't use Info w/o a global pointer */
  148.         EXIT(PK_ERR);   /* programming error while still working */
  149.     }
  150.  
  151.     return threadPtrTable[scan];
  152. }
  153.  
  154. #  endif /* ?USETHREADID */
  155. #endif /* ?REENTRANT */
  156.  
  157.  
  158.  
  159. Uz_Globs *globalsCtor()
  160. {
  161. #ifdef REENTRANT
  162.     Uz_Globs *pG = (Uz_Globs *)malloc(sizeof(Uz_Globs));
  163.  
  164.     if (!pG)
  165.         return (Uz_Globs *)NULL;
  166. #endif /* REENTRANT */
  167.  
  168.     /* for REENTRANT version, G is defined as (*pG) */
  169.  
  170.     memzero(&G, sizeof(Uz_Globs));
  171.  
  172. #ifndef FUNZIP
  173. #ifdef CMS_MVS
  174.     uO.aflag=1;
  175.     uO.C_flag=1;
  176. #endif
  177. #ifdef TANDEM
  178.     uO.aflag=1;     /* default to '-a' auto create Text Files as type 101 */
  179. #endif
  180. #ifdef VMS
  181. # if (!defined(NO_TIMESTAMPS))
  182.     uO.D_flag=1;    /* default to '-D', no restoration of dir timestamps */
  183. # endif
  184. #endif
  185.  
  186.     uO.lflag=(-1);
  187.     G.wildzipfn = "";
  188.     G.pfnames = (char **)fnames;
  189.     G.pxnames = (char **)&fnames[1];
  190.     G.pInfo = G.info;
  191.     G.sol = TRUE;          /* at start of line */
  192.  
  193.     G.message = UzpMessagePrnt;
  194.     G.input = UzpInput;           /* not used by anyone at the moment... */
  195. #if defined(WINDLL) || defined(MACOS)
  196.     G.mpause = NULL;              /* has scrollbars:  no need for pausing */
  197. #else
  198.     G.mpause = UzpMorePause;
  199. #endif
  200.     G.decr_passwd = UzpPassword;
  201. #endif /* !FUNZIP */
  202.  
  203. #if (!defined(DOS_FLX_H68_NLM_OS2_W32) && !defined(AMIGA) && !defined(RISCOS))
  204. #if (!defined(MACOS) && !defined(ATARI) && !defined(VMS))
  205.     G.echofd = -1;
  206. #endif /* !(MACOS || ATARI || VMS) */
  207. #endif /* !(DOS_FLX_H68_NLM_OS2_W32 || AMIGA || RISCOS) */
  208.  
  209. #ifdef SYSTEM_SPECIFIC_CTOR
  210.     SYSTEM_SPECIFIC_CTOR(__G);
  211. #endif
  212.  
  213. #ifdef REENTRANT
  214. #ifdef USETHREADID
  215.     registerGlobalPointer(__G);
  216. #else
  217.     GG = &G;
  218. #endif /* ?USETHREADID */
  219. #endif /* REENTRANT */
  220.  
  221.     return &G;
  222. }
  223.