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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CityHash.h"
#include "cityhash/city.h"
#include <tchar.h>
#define MAX_STRLEN 1024
typedef struct _stack_t {
struct _stack_t *next;
TCHAR text[MAX_STRLEN];
} stack_t;
stack_t **g_stacktop;
char *g_variables;
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
bool popString(TCHAR *result)
{
stack_t *th;
if (!g_stacktop || !*g_stacktop) return false;
th = (*g_stacktop);
lstrcpyn(result, th->text, MAX_STRLEN);
*g_stacktop = th->next;
GlobalFree((HGLOBAL)th);
return true;
}
void pushString(const TCHAR *str)
{
stack_t *th;
int strLen = wcslen(str)+1;
if (!g_stacktop) return;
th = (stack_t*)GlobalAlloc(GPTR, sizeof(stack_t) + (MAX_STRLEN*sizeof(TCHAR)));
lstrcpyn(th->text, str, strLen);
th->next = *g_stacktop;
*g_stacktop = th;
}
extern "C"
{
void GetCityHash64(HWND hwndParent, int string_size, char *variables, stack_t **stacktop)
{
TCHAR hashString[MAX_STRLEN];
TCHAR hexResult[18] = { _T('\0') };
g_stacktop = stacktop;
g_variables = variables;
memset(hashString, 0, sizeof(hashString));
memset(hexResult, 0, sizeof(hexResult));
if (!popString(hashString)) {
pushString(L"error");
return;
}
uint64 result = CityHash64((const char*)&hashString[0], wcslen(hashString)*sizeof(TCHAR));
// If the hash happens to work out to less than 16 hash digits it will just
// use less of the buffer.
swprintf(hexResult, L"%I64X", result);
pushString(hexResult);
}
}
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