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#include "main.h"

int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        printf("Useage: CaptMicroSteamFriendsLockTest.exe [your_id]\n");
        return 1;
    }

    BYTE issf = IsSteamFriend(argv[1], "captmicro");
    if (issf == 0) MessageBoxA(0, "You are friends with Capt. Micro\n", 0, 0);
    else MessageBoxA(0, "You are NOT friends with Capt. Micro\n", 0, 0);

    return 0;
}

BYTE IsSteamFriend(char *id1, char *id2)
{
    _URLDownloadToCacheFileA URL_D2CFA = NULL;
    HMODULE urlmon = LoadLibraryA("urlmon.dll");
    if (urlmon == NULL) return 2;
    URL_D2CFA = (_URLDownloadToCacheFileA)GetProcAddress(urlmon, "URLDownloadToCacheFileA");
    if (URL_D2CFA == NULL) return 3;

    char *url = NULL;
    url = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 7+22+lstrlenA(id1)+8+10);
    lstrcpyA(url, "http://"); lstrcatA(url, "steamcommunity.com/id/");
    lstrcatA(url, id1); lstrcatA(url, "/friends");

    char *cfile = NULL;
    cfile = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, MAX_PATH+10);
    if (cfile == NULL)
    {
        HeapFree(GetProcessHeap(), 0, cfile);
        HeapFree(GetProcessHeap(), 0, url);
        return 4;
    }

    HRESULT dres = URL_D2CFA(NULL, url, cfile, MAX_PATH, 0, NULL);
    if (dres != S_OK || FAILED(dres))
    {
        HeapFree(GetProcessHeap(), 0, cfile);
        HeapFree(GetProcessHeap(), 0, url);
        return 5;
    } HeapFree(GetProcessHeap(), 0, url);

    DWORD attr = GetFileAttributesA(cfile);
    if (attr == INVALID_FILE_ATTRIBUTES) { HeapFree(GetProcessHeap(), 0, cfile); return 6; }

    HANDLE file = CreateFileA(cfile, FILE_GENERIC_READ, FILE_SHARE_READ,
        NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    HeapFree(GetProcessHeap(), 0, cfile);
    if (file == NULL && GetLastError() == ERROR_FILE_NOT_FOUND) return 7;

    DWORD size = GetFileSize(file, NULL);
    if (size == 0) { CloseHandle(file); return 8; }

    char *data = NULL; DWORD bytesRead = 0;
    data = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size+10);
    BOOL rfret = ReadFile(file, data, size, &bytesRead, NULL);
    if (rfret == FALSE) { HeapFree(GetProcessHeap(), 0, data); CloseHandle(file); return 9; }
    if (lstrlenA(data) == 0) { HeapFree(GetProcessHeap(), 0, data); CloseHandle(file); return 10; }

    char *findstr = NULL;
    findstr = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 7+22+lstrlenA(id2)+10);
    if (findstr == NULL) { HeapFree(GetProcessHeap(), 0, data); CloseHandle(file); return 11; }
    lstrcpyA(url, "http://"); lstrcatA(url, "steamcommunity.com/id/"); lstrcatA(url, id2);

    char *sfound = _IsSteamFriend_strstr(data, findstr);
    HeapFree(GetProcessHeap(), 0, findstr);
    if (sfound == 0) { HeapFree(GetProcessHeap(), 0, data); CloseHandle(file); return 12; }
    else { HeapFree(GetProcessHeap(), 0, data); CloseHandle(file); return 0; }

    HeapFree(GetProcessHeap(), 0, data);
    CloseHandle(file);
    return 1;
}
char *_IsSteamFriend_strchr(char *s, char c)
{
    char *ptr = s;
    while (*ptr != 0 && *ptr != c) ptr++;
    return ((*ptr == c) ? ptr : 0);
}
int _IsSteamFriend_strncmp(char *s1, char *s2, unsigned long n)
{
    char *str1 = s1; char *str2 = s2;
    if (n == 0) return 0;
    while (n-- > 0 && *str1 == *str2)
        { if (n == 0 || *s1 == 0) return 0; str1++; str2++; }
    unsigned char u1 = (*(unsigned char*)str1);
    unsigned char u2 = (*(unsigned char*)str2);
    return ((u1 < u2) ? -1 : (u1 > u2));
}
char *_IsSteamFriend_strstr(char *h, char *n)
{
    char *haystack = h; char *needle = n;
    if (*needle == 0) return haystack;
    unsigned long nlen = 0; nlen = lstrlenA(needle);
    for (; (haystack =_IsSteamFriend_strchr(haystack, *needle)) != 0; haystack++)
        if (_IsSteamFriend_strncmp(haystack, needle, nlen) == 0)
            return haystack;
    return 0;
}