winamp/Src/Plugins/Input/in_flv/BackgroundDownloader.cpp

#include "Main.h"
#include "BackgroundDownloader.h"
#include "..\..\..\Components\wac_network\wac_network_http_receiver_api.h"
#include "api__in_flv.h"
#include "api/service/waservicefactory.h"
#include "../nu/AutoChar.h"

#include <strsafe.h>

#define HTTP_BUFFER_SIZE 65536

// {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 ] = { 0 };
	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, int *downloaded )
{
	char downloadedData[ HTTP_BUFFER_SIZE ] = { 0 };
	int result       = 0;
	int downloadSize = http->get_bytes( downloadedData, HTTP_BUFFER_SIZE );

	*downloaded = downloadSize;
	if ( downloadSize )
	{
		result = callback->OnData( downloadedData, downloadSize );
	}

	return result;
}

static void RunDownload( api_httpreceiver *http, Downloader::DownloadCallback *callback )
{
	int ret;
	int downloaded = 0;
	do
	{
		ret = http->run();
		Sleep( 55 );
		do
		{
			if ( FeedHTTP( http, callback, &downloaded ) != 0 )
				return;
		} while ( downloaded == HTTP_BUFFER_SIZE );
	} while ( ret == HTTPRECEIVER_RUN_OK );

	// finish off the data
	do
	{
		if ( FeedHTTP( http, callback, &downloaded ) != 0 )
			return;
	} while ( downloaded );
}


bool Downloader::Download(const char *url, Downloader::DownloadCallback *callback, uint64_t startPosition)
{
	api_httpreceiver *http = 0;
	waServiceFactory *sf = plugin.service->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] = {0};
		StringCchPrintfA(temp, 128, "Range: bytes=%d-", startPosition);
		http->addheader(temp);
	}
	SetUserAgent(http);
	http->connect(url);
	int ret;

	do
	{
		Sleep(55);
		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:
			{
				if (callback->OnConnect(http) != 0)
				{
					sf->releaseInterface(http);
					return false;
				}

				RunDownload(http, callback);
				sf->releaseInterface(http);
				return true;
			}
			break;
		default:
			sf->releaseInterface(http);
			return false;
		}
	}
	while (ret == HTTPRECEIVER_RUN_OK);
	//const char *er = http->geterrorstr();
	sf->releaseInterface(http);
	return false;
}