bool setPosition (int64 wantedPos)
{
if (isError())
return false;
if (wantedPos != position)
{
finished = false;
position = (int64) InternetSetFilePointer (request, (LONG) wantedPos, 0, FILE_BEGIN, 0);
if (position == wantedPos)
return true;
if (wantedPos < position)
{
close();
position = 0;
createConnection (0, 0);
}
skipNextBytes (wantedPos - position);
}
return true;
}
int CZipExists::RemoteFileExists()
{
int iResult = -1; // network error
DWORD dwFilePos = 0;
HINTERNET hInternet = NULL, hDownload = NULL;
CString csUrl = m_csUrl + m_csFileName;
//AfxMessageBox(csUrl, MB_ICONINFORMATION);
hInternet = InternetOpen(_T("Internet"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
if(hInternet != NULL)
{
hDownload = InternetOpenUrl(hInternet, csUrl, NULL, 0, INTERNET_FLAG_RELOAD, 0);
if(hDownload != NULL)
{
dwFilePos = InternetSetFilePointer(hDownload, 0, NULL, FILE_BEGIN, NULL);
iResult = (dwFilePos != (DWORD)-1) ? 1 : 0;
InternetCloseHandle(hDownload);
}
else
{
GetInetError();
}
InternetCloseHandle(hInternet);
}
else
{
GetInetError();
}
return iResult;
}
exifoff_t
ExifInternetIO::seek( exifoff_t off, int whence)
{
DWORD dwMoveMethod;
switch(whence)
{
case 0:
dwMoveMethod = FILE_BEGIN;
break;
case 1:
dwMoveMethod = FILE_CURRENT;
break;
case 2:
dwMoveMethod = FILE_END;
break;
default:
dwMoveMethod = FILE_BEGIN;
break;
}
return (exifoff_t)InternetSetFilePointer(mHInternet, off, 0, dwMoveMethod, 0);
}
int HttpDownLoad_real(
std::string& tmp_file,
const std::string& url,
const std::string& file,
std::function<void(double)> callback)
{
HINTERNET hSession = InternetOpen(_T("HTTPDOWNLOAD"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
scloud::ScopeGuard session([hSession]{InternetCloseHandle(hSession);});
if (!hSession) {
session.cancel();
return GetLastError();
}
HINTERNET hInternet = InternetOpenUrl(hSession, url.c_str(), NULL, 0 , INTERNET_FLAG_RAW_DATA, 0 );
scloud::ScopeGuard internet([hInternet]{InternetCloseHandle(hInternet);});
if (!hInternet) {
internet.cancel();
return GetLastError();
}
//get http return code.
char szContent[32] = {0};
DWORD dwInfoSize = 32;
HttpQueryInfoA(hInternet, HTTP_QUERY_STATUS_CODE, szContent, &dwInfoSize, NULL);
int ret = StrToIntA(szContent);
if (ret >= 400)
{
return ret;
}
//get file size
ZeroMemory(szContent, 32);
dwInfoSize = 32;
HttpQueryInfoA(hInternet, HTTP_QUERY_CONTENT_LENGTH, szContent, &dwInfoSize, NULL);
__int64 size = 0;
StrToInt64ExA(szContent, 10, &size);
if (size <= 0)
{
return ERROR_CONTENT_LENGTH_LESS_THAN_ZERO;
}
TCHAR szTmpFile[MAX_PATH] = {0};
if (!tmp_file.empty())
{
lstrcpy(szTmpFile, tmp_file.c_str());
}
else
{
TCHAR szTmpPath[MAX_PATH] = {0};
GetTempPath(MAX_PATH, szTmpPath);
if (0 == GetTempFileName(szTmpPath, _T("http"), 0, szTmpFile))
{
return GetLastError();
}
}
tmp_file = szTmpFile;
HANDLE hFile = CreateFile(szTmpFile,
GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL);
scloud::ScopeGuard create_file([hFile]{CloseHandle(hFile);});
if (INVALID_HANDLE_VALUE == hFile)
{
create_file.cancel();
return GetLastError();
}
LARGE_INTEGER large_int = {0};
GetFileSizeEx(hFile, &large_int);
if (large_int.QuadPart > size)
{
return ERROR_TMP_FILE_TOO_BIG;
}
if (large_int.QuadPart > 0)
{
if (INVALID_SET_FILE_POINTER == SetFilePointer(hFile, 0, NULL, FILE_END))
{
return GetLastError();
}
if (INVALID_SET_FILE_POINTER == InternetSetFilePointer(
hInternet, large_int.LowPart, NULL, FILE_BEGIN, 0))
{
return GetLastError();
}
}
__int64 rsize = large_int.QuadPart;
for(;rsize < size;)
{
char buf[512] = {0};
DWORD dwRead = 0;
if (!InternetReadFile(hInternet, buf, 512, &dwRead))
{
return GetLastError();
}
if (dwRead == 0)
{
return ERROR_WTF_NO_DATA;
}
for(DWORD dwOnce=0; dwRead != dwOnce;)
{
DWORD dwWritten = 0;
if (0 == WriteFile(hFile, buf+dwOnce, dwRead-dwOnce, &dwWritten, NULL))
return GetLastError();
dwOnce += dwWritten;
}
rsize += dwRead;
if (rsize == size)
break;
if (callback)
callback((double)rsize/size);
}
if (rsize == size)
{
create_file.cancel();
CloseHandle(hFile);
SetFileAttributes(file.c_str(), FILE_ATTRIBUTE_NORMAL);
DeleteFile(file.c_str());
if (MoveFile(szTmpFile, file.c_str()))
{
//succeed.
if (callback)
callback(1.0);
return 0;
}
}
return GetLastError();
}
DWORD CInternetFile::SetFilePointer(LONG offset, DWORD method) {
return InternetSetFilePointer(m_hInternet, offset, 0, method, 0);
}
