117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
#if (defined(_WIN64) || defined(_WIN32_WCE)) && !defined(UNICODE)
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#define UNICODE
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#endif
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#if defined(UNICODE) && !defined(_UNICODE)
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#define _UNICODE
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#endif
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#if defined(_UNICODE) && !defined(UNICODE)
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#define UNICODE
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#endif
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#include <windows.h>
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#include <tchar.h>
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#include <stdio.h>
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#include "uplink.h"
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void OPENSSL_showfatal(const char *,...);
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static TCHAR msg[128];
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static void unimplemented (void)
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{ OPENSSL_showfatal (sizeof(TCHAR)==sizeof(char)?"%s\n":"%S\n",msg);
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ExitProcess (1);
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}
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void OPENSSL_Uplink (volatile void **table, int index)
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{ static HMODULE volatile apphandle=NULL;
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static void ** volatile applinktable=NULL;
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int len;
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void (*func)(void)=unimplemented;
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HANDLE h;
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void **p;
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/* Note that the below code is not MT-safe in respect to msg
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* buffer, but what's the worst thing that can happen? Error
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* message might be misleading or corrupted. As error condition
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* is fatal and should never be risen, I accept the risk... */
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/* One can argue that I should have used InterlockedExchangePointer
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* or something to update static variables and table[]. Well,
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* store instructions are as atomic as they can get and assigned
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* values are effectively constant... So that volatile qualifier
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* should be sufficient [it prohibits compiler to reorder memory
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* access instructions]. */
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do {
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len = _sntprintf (msg,sizeof(msg)/sizeof(TCHAR),
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_T("OPENSSL_Uplink(%p,%02X): "),table,index);
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_tcscpy (msg+len,_T("unimplemented function"));
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if ((h=apphandle)==NULL)
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{ if ((h=GetModuleHandle(NULL))==NULL)
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{ apphandle=(HMODULE)-1;
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_tcscpy (msg+len,_T("no host application"));
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break;
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}
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apphandle = h;
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}
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if ((h=apphandle)==(HMODULE)-1) /* revalidate */
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break;
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if (applinktable==NULL)
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{ void**(*applink)();
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applink=(void**(*)())GetProcAddress(h,"OPENSSL_Applink");
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if (applink==NULL)
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{ apphandle=(HMODULE)-1;
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_tcscpy (msg+len,_T("no OPENSSL_Applink"));
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break;
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}
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p = (*applink)();
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if (p==NULL)
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{ apphandle=(HMODULE)-1;
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_tcscpy (msg+len,_T("no ApplinkTable"));
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break;
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}
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applinktable = p;
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}
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else
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p = applinktable;
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if (index > (int)p[0])
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break;
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if (p[index]) func = p[index];
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} while (0);
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table[index] = func;
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}
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#if defined(_MSC_VER) && defined(_M_IX86) && !defined(OPENSSL_NO_INLINE_ASM)
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#define LAZY(i) \
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__declspec(naked) static void lazy##i (void) { \
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_asm push i \
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_asm push OFFSET OPENSSL_UplinkTable \
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_asm call OPENSSL_Uplink \
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_asm add esp,8 \
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_asm jmp OPENSSL_UplinkTable+4*i }
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#if APPLINK_MAX>25
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#error "Add more stubs..."
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#endif
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/* make some in advance... */
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LAZY(1) LAZY(2) LAZY(3) LAZY(4) LAZY(5)
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LAZY(6) LAZY(7) LAZY(8) LAZY(9) LAZY(10)
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LAZY(11) LAZY(12) LAZY(13) LAZY(14) LAZY(15)
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LAZY(16) LAZY(17) LAZY(18) LAZY(19) LAZY(20)
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LAZY(21) LAZY(22) LAZY(23) LAZY(24) LAZY(25)
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void *OPENSSL_UplinkTable[] = {
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(void *)APPLINK_MAX,
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lazy1, lazy2, lazy3, lazy4, lazy5,
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lazy6, lazy7, lazy8, lazy9, lazy10,
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lazy11,lazy12,lazy13,lazy14,lazy15,
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lazy16,lazy17,lazy18,lazy19,lazy20,
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lazy21,lazy22,lazy23,lazy24,lazy25,
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};
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#endif
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#ifdef SELFTEST
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main() { UP_fprintf(UP_stdout,"hello, world!\n"); }
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#endif
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