Function ILAPIENTRY ilutWinLoadUrl

DevIL/src-ILUT/src/ilut_win32.cpp:766–852

#if !defined(_WIN32_WCE) && !(defined(_WIN32) && defined(__GNUC__))
#define BUFFSIZE 8192  // Change to suit the efficiency.
ILboolean ILAPIENTRY ilutWinLoadUrl(ILstring Url)
{
	HINTERNET	Handle, UrlHandle;
	DWORD		BytesRead = 0, Context = 1;
	ILubyte		Buff[BUFFSIZE], *Buffer, *TempBuff;
	ILuint		BufferSize = 0, i;
	ILboolean	Is404 = IL_TRUE;
	char		Buffer404[] = { '<', 'h', 't', 'm', 'l', '>' };

	Buffer = (ILubyte*)ialloc(0);
	if (Buffer == NULL) {
		return IL_FALSE;
	}

	Handle = InternetOpen(IL_TEXT("Developer's Image Library"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
	if (Handle == NULL) {
		ifree(Buffer);
		ilSetError(ILUT_COULD_NOT_OPEN_FILE);
		return IL_FALSE;
	}

	// Try again if fails the first time, loading only from the cache.
	UrlHandle = InternetOpenUrl(Handle, Url, NULL, 0, 0, Context);
	if (UrlHandle == NULL) {
		InternetCloseHandle(Handle);
		Handle = InternetOpen(IL_TEXT("Developer's Image Library"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, INTERNET_FLAG_FROM_CACHE);
		if (Handle == NULL) {
			ifree(Buffer);
			ilSetError(ILUT_COULD_NOT_OPEN_FILE);
			return IL_FALSE;
		}
		UrlHandle = InternetOpenUrl(Handle, Url, NULL, 0, 0, Context);
		if (UrlHandle == NULL) {
			ifree(Buffer);
			InternetCloseHandle(Handle);
			ilSetError(ILUT_COULD_NOT_OPEN_FILE);
			return IL_FALSE;
		}
	}

	do {
		if (!InternetReadFile(UrlHandle, Buff, BUFFSIZE, &BytesRead)) {
			InternetCloseHandle(UrlHandle);
			InternetCloseHandle(Handle);
			ifree(Buffer);
			ilSetError(ILUT_COULD_NOT_OPEN_FILE);
			return IL_FALSE;
		}

		TempBuff = (ILubyte*)ialloc(BufferSize + BytesRead);
		if (TempBuff == NULL) {
			ifree(Buffer);
			return IL_FALSE;
		}

		memcpy(TempBuff, Buffer, BufferSize);
		memcpy(TempBuff + BufferSize, Buff, BytesRead);
		ifree(Buffer);