1 files changed, 128 insertions, 0 deletions
diff --git a/Src/Components/wac_downloadManager/BackgroundDownloader.cpp b/Src/Components/wac_downloadManager/BackgroundDownloader.cpp
new file mode 100644
index 00000000..a0731ebc
--- /dev/null
+++ b/Src/Components/wac_downloadManager/BackgroundDownloader.cpp
@@ -0,0 +1,128 @@
+#include "BackgroundDownloader.h"
+#include "../../Components\wac_network/wac_network_http_receiver_api.h"
+
+#include "api__wac_downloadManager.h"
+
+#include "api/service/waservicefactory.h"
+
+#include "../nu/AutoChar.h"
+
+#include <strsafe.h>
+
+#define HTTP_BUFFER_SIZE 32768
+// {C0A565DC-0CFE-405a-A27C-468B0C8A3A5C}
+static const GUID internetConfigGroupGUID =
+{ 0xc0a565dc, 0xcfe, 0x405a, { 0xa2, 0x7c, 0x46, 0x8b, 0xc, 0x8a, 0x3a, 0x5c } };
+
+
+static void SetUserAgent( api_httpreceiver *http )
+{
+	char agent[ 256 ];
+	StringCchPrintfA( agent, 256, "User-Agent: %S/%S", WASABI_API_APP->main_getAppName(), WASABI_API_APP->main_getVersionNumString() );
+	http->addheader( agent );
+}
+
+static int FeedHTTP( api_httpreceiver *http, Downloader::DownloadCallback &callback, void *userData, bool *noData )
+{
+	char downloadedData[ HTTP_BUFFER_SIZE ];
+	int result = 0;
+	int downloadSize = http->get_bytes( downloadedData, HTTP_BUFFER_SIZE );
+	if ( downloadSize )
+	{
+		result = callback( userData, downloadedData, downloadSize );
+		*noData = false;
+	}
+	else
+		*noData = true;
+
+	return result;
+}
+
+static void RunDownload( api_httpreceiver *http, Downloader::DownloadCallback &callback, void *userData )
+{
+	int ret;
+	bool noData;
+	do
+	{
+		Sleep( 50 );
+		ret = http->run();
+		if ( FeedHTTP( http, callback, userData, &noData ) != 0 )
+			return;
+	} while ( ret == HTTPRECEIVER_RUN_OK );
+
+	// finish off the data
+	do
+	{
+		if ( FeedHTTP( http, callback, userData, &noData ) != 0 )
+			return;
+	} while ( !noData );
+}
+
+
+bool Downloader::Download( const char *url, Downloader::DownloadCallback &callback, void *userdata, uint64_t startPosition )
+{
+	api_httpreceiver *http = 0;
+
+	waServiceFactory *sf = WASABI_API_SVC->service_getServiceByGuid( httpreceiverGUID );
+	if ( sf )
+		http = (api_httpreceiver *)sf->getInterface();
+
+	if ( !http )
+		return false;
+
+	int use_proxy = 1;
+	bool proxy80 = AGAVE_API_CONFIG->GetBool( internetConfigGroupGUID, L"proxy80", false );
+	if ( proxy80 && strstr( url, ":" ) && ( !strstr( url, ":80/" ) && strstr( url, ":80" ) != ( url + strlen( url ) - 3 ) ) )
+		use_proxy = 0;
+
+	const wchar_t *proxy = use_proxy ? AGAVE_API_CONFIG->GetString( internetConfigGroupGUID, L"proxy", 0 ) : 0;
+
+	http->AllowCompression();
+	http->open( API_DNS_AUTODNS, HTTP_BUFFER_SIZE, ( proxy && proxy[ 0 ] ) ? (const char *)AutoChar( proxy ) : NULL );
+
+	if ( startPosition > 0 )
+	{
+		char temp[ 128 ];
+		StringCchPrintfA( temp, 128, "Range: bytes=%d-", startPosition );
+		http->addheader( temp );
+	}
+
+	SetUserAgent( http );
+	http->connect( url );
+
+	int ret;
+
+	do
+	{
+		Sleep( 10 );
+
+		ret = http->run();
+		if ( ret == -1 ) // connection failed
+			break;
+
+		// ---- check our reply code ----
+		int replycode = http->getreplycode();
+		switch ( replycode )
+		{
+			case 0:
+			case 100:
+				break;
+			case 200:
+			{
+				RunDownload( http, callback, userdata );
+
+				sf->releaseInterface( http );
+
+				return true;
+			}
+			break;
+			default:
+				sf->releaseInterface( http );
+				return false;
+		}
+	} while ( ret == HTTPRECEIVER_RUN_OK );
+
+	sf->releaseInterface( http );
+
+	return false;
+}