Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 739 insertions, 0 deletions

diff --git a/other-licenses/nsis/Contrib/InetBgDL/InetBgDL.cpp b/other-licenses/nsis/Contrib/InetBgDL/InetBgDL.cpp
new file mode 100644
index 0000000000..0d248be60d
--- /dev/null
+++ b/other-licenses/nsis/Contrib/InetBgDL/InetBgDL.cpp
@@ -0,0 +1,739 @@
+//
+// Copyright (C) Anders Kjersem. Licensed under the zlib/libpng license
+//
+
+// This file is intended to be compiled with MSVC's Omit Default Library Name (/Zl)
+// option enabled, in order to keep the file size low for bundling this DLL with
+// the stub installer. That means that any code requiring the C runtime will fail
+// to link. You'll see a couple of odd-looking things here for this reason; they
+// should all be called out with comments.
+
+#include "InetBgDL.h"
+
+#define USERAGENT _T("NSIS InetBgDL (Mozilla)")
+
+#define STATUS_COMPLETEDALL 0
+#define STATUS_INITIAL 202
+#define STATUS_CONNECTING STATUS_INITIAL //102
+#define STATUS_DOWNLOADING STATUS_INITIAL
+#define STATUS_ERR_GETLASTERROR 418 //HTTP: I'm a teapot: Win32 error code in $3
+#define STATUS_ERR_LOCALFILEWRITEERROR 450 //HTTP: MS parental control extension
+#define STATUS_ERR_CANCELLED 499
+#define STATUS_ERR_CONNECTION_LOST 1000
+
+typedef DWORD FILESIZE_T; // Limit to 4GB for now...
+#define FILESIZE_UNKNOWN (-1)
+
+#define MAX_STRLEN 1024
+
+HINSTANCE g_hInst;
+NSIS::stack_t*g_pLocations = NULL;
+HANDLE g_hThread = NULL;
+HANDLE g_hGETStartedEvent = NULL;
+HINTERNET g_hInetSes = NULL;
+HINTERNET g_hInetFile = NULL;
+volatile UINT g_FilesTotal = 0;
+volatile UINT g_FilesCompleted = 0;
+volatile UINT g_Status = STATUS_INITIAL;
+volatile FILESIZE_T g_cbCurrXF;
+volatile FILESIZE_T g_cbCurrTot = FILESIZE_UNKNOWN;
+CRITICAL_SECTION g_CritLock;
+UINT g_N_CCH;
+PTSTR g_N_Vars;
+TCHAR g_ServerIP[128] = { _T('\0') };
+
+DWORD g_ConnectTimeout = 0;
+DWORD g_ReceiveTimeout = 0;
+
+// Setup a buffer of size 256KiB to store the downloaded data.
+constexpr UINT g_cbBufXF = 262144;
+// This buffer is only needed inside TaskThreadProc(), but declaring it on
+// the stack there triggers a runtime stack size check, which is implemented
+// by a C runtime library function, so we have to avoid the compiler wanting
+// to build that check by not having any large stack buffers.
+BYTE g_bufXF[g_cbBufXF];
+
+#define NSISPI_INITGLOBALS(N_CCH, N_Vars) do { \
+  g_N_CCH = N_CCH; \
+  g_N_Vars = N_Vars; \
+  } while(0)
+
+#define ONELOCKTORULETHEMALL
+#ifdef ONELOCKTORULETHEMALL
+#define TaskLock_AcquireExclusive() EnterCriticalSection(&g_CritLock)
+#define TaskLock_ReleaseExclusive() LeaveCriticalSection(&g_CritLock)
+#define StatsLock_AcquireExclusive() TaskLock_AcquireExclusive()
+#define StatsLock_ReleaseExclusive() TaskLock_ReleaseExclusive()
+#define StatsLock_AcquireShared() StatsLock_AcquireExclusive()
+#define StatsLock_ReleaseShared() StatsLock_ReleaseExclusive()
+#endif
+
+// Normally we would just call the C library wcstol, but since we can't use the
+// C runtime, we'll supply our own function as an understudy.
+static DWORD
+MyTStrToL(TCHAR const* str)
+{
+  if (!str) {
+    return 0;
+  }
+
+  int len = lstrlen(str);
+  DWORD place = 1;
+  DWORD rv = 0;
+  for (int i = len - 1; i >= 0; --i) {
+    int digit = str[i] - 0x30;
+    rv += digit * place;
+    place *= 10;
+  }
+  return rv;
+}
+
+PTSTR NSIS_SetRegStr(UINT Reg, LPCTSTR Value)
+{
+  PTSTR s = g_N_Vars + (Reg * g_N_CCH);
+  lstrcpy(s, Value);
+  return s;
+}
+#define NSIS_SetRegStrEmpty(r) NSIS_SetRegStr(r, _T(""))
+void NSIS_SetRegUINT(UINT Reg, UINT Value)
+{
+  TCHAR buf[32];
+  wsprintf(buf, _T("%u"), Value);
+  NSIS_SetRegStr(Reg, buf);
+}
+#define StackFreeItem(pI) GlobalFree(pI)
+NSIS::stack_t* StackPopItem(NSIS::stack_t**ppST)
+{
+  if (*ppST)
+  {
+    NSIS::stack_t*pItem = *ppST;
+    *ppST = pItem->next;
+    return pItem;
+  }
+  return NULL;
+}
+
+void Reset()
+{
+  // The g_hGETStartedEvent event is used to make sure that the Get() call will
+  // acquire the lock before the Reset() call acquires the lock.
+  if (g_hGETStartedEvent) {
+    TRACE(_T("InetBgDl: waiting on g_hGETStartedEvent\n"));
+    WaitForSingleObject(g_hGETStartedEvent, INFINITE);
+    CloseHandle(g_hGETStartedEvent);
+    g_hGETStartedEvent = NULL;
+  }
+
+  TaskLock_AcquireExclusive();
+#ifndef ONELOCKTORULETHEMALL
+  StatsLock_AcquireExclusive();
+#endif
+  g_FilesTotal = 0; // This causes the Task thread to exit the transfer loop
+  if (g_hThread)
+  {
+    TRACE(_T("InetBgDl: waiting on g_hThread\n"));
+    if (WAIT_OBJECT_0 != WaitForSingleObject(g_hThread, 5 * 1000))
+    {
+      TRACE(_T("InetBgDl: terminating g_hThread\n"));
+      // Suspend the thread so that it's not still trying to use these handles
+      // that we're about to close out from under it.
+      SuspendThread(g_hThread);
+      if (g_hInetFile) {
+        InternetCloseHandle(g_hInetFile);
+        g_hInetFile = nullptr;
+      }
+      if (g_hInetSes) {
+        InternetCloseHandle(g_hInetSes);
+        g_hInetSes = nullptr;
+      }
+      TerminateThread(g_hThread, ERROR_OPERATION_ABORTED);
+    }
+    CloseHandle(g_hThread);
+    g_hThread = NULL;
+  }
+  g_FilesTotal = 0;
+  g_FilesCompleted = 0;
+  g_Status = STATUS_INITIAL;
+#ifndef ONELOCKTORULETHEMALL
+  StatsLock_ReleaseExclusive();
+#endif
+  for (NSIS::stack_t*pTmpTast,*pTask = g_pLocations; pTask ;)
+  {
+    pTmpTast = pTask;
+    pTask = pTask->next;
+    StackFreeItem(pTmpTast);
+  }
+  g_pLocations = NULL;
+  TaskLock_ReleaseExclusive();
+}
+
+UINT_PTR __cdecl NSISPluginCallback(UINT Event)
+{
+  switch(Event)
+  {
+  case NSPIM_UNLOAD:
+    Reset();
+    break;
+  }
+  return NULL;
+}
+
+void __stdcall InetStatusCallback(HINTERNET hInternet, DWORD_PTR dwContext,
+                                  DWORD dwInternetStatus,
+                                  LPVOID lpvStatusInformation,
+                                  DWORD dwStatusInformationLength)
+{
+  if (dwInternetStatus == INTERNET_STATUS_NAME_RESOLVED) {
+    // If we're in the process of being reset, don't try to update g_ServerIP;
+    // there's no need for it, and Reset() will be holding the StatsLock, so
+    // we'll hang here and block the reset if we try to acquire it.
+    if (g_FilesTotal != 0) {
+      // The documentation states the IP address is a PCTSTR but it is usually a
+      // PCSTR and only sometimes a PCTSTR.
+      StatsLock_AcquireExclusive();
+      wsprintf(g_ServerIP, _T("%S"), lpvStatusInformation);
+      if (lstrlen(g_ServerIP) == 1)
+      {
+        wsprintf(g_ServerIP, _T("%s"), lpvStatusInformation);
+      }
+      StatsLock_ReleaseExclusive();
+    }
+  }
+
+#if defined(PLUGIN_DEBUG)
+  switch (dwInternetStatus)
+  {
+    case INTERNET_STATUS_RESOLVING_NAME:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_RESOLVING_NAME (%d), name=%s\n"),
+            dwStatusInformationLength, lpvStatusInformation);
+      break;
+    case INTERNET_STATUS_NAME_RESOLVED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_NAME_RESOLVED (%d), resolved name=%s\n"),
+            dwStatusInformationLength, g_ServerIP);
+      break;
+    case INTERNET_STATUS_CONNECTING_TO_SERVER:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_CONNECTING_TO_SERVER (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_CONNECTED_TO_SERVER:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_CONNECTED_TO_SERVER (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_SENDING_REQUEST:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_SENDING_REQUEST (%d)\n"),
+               dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_REQUEST_SENT:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_REQUEST_SENT (%d), bytes sent=%d\n"),
+             dwStatusInformationLength, lpvStatusInformation);
+      break;
+    case INTERNET_STATUS_RECEIVING_RESPONSE:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_RECEIVING_RESPONSE (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_RESPONSE_RECEIVED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_RESPONSE_RECEIVED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_CTL_RESPONSE_RECEIVED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_CTL_RESPONSE_RECEIVED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_PREFETCH:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_PREFETCH (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_CLOSING_CONNECTION:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_CLOSING_CONNECTION (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_CONNECTION_CLOSED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_CONNECTION_CLOSED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_HANDLE_CREATED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_HANDLE_CREATED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_HANDLE_CLOSING:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_HANDLE_CLOSING (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_DETECTING_PROXY:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_DETECTING_PROXY (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_REQUEST_COMPLETE:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_REQUEST_COMPLETE (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_REDIRECT:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_REDIRECT (%d), new url=%s\n"),
+            dwStatusInformationLength, lpvStatusInformation);
+      break;
+    case INTERNET_STATUS_INTERMEDIATE_RESPONSE:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_INTERMEDIATE_RESPONSE (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_USER_INPUT_REQUIRED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_USER_INPUT_REQUIRED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_STATE_CHANGE:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_STATE_CHANGE (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_COOKIE_SENT:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_COOKIE_SENT (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_COOKIE_RECEIVED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_COOKIE_RECEIVED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_PRIVACY_IMPACTED:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_PRIVACY_IMPACTED (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_P3P_HEADER:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_P3P_HEADER (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_P3P_POLICYREF:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_P3P_POLICYREF (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    case INTERNET_STATUS_COOKIE_HISTORY:
+      TRACE(_T("InetBgDl: INTERNET_STATUS_COOKIE_HISTORY (%d)\n"),
+            dwStatusInformationLength);
+      break;
+    default:
+      TRACE(_T("InetBgDl: Unknown Status %d\n"), dwInternetStatus);
+      break;
+  }
+#endif
+}
+
+DWORD CALLBACK TaskThreadProc(LPVOID ThreadParam)
+{
+  NSIS::stack_t *pURL,*pFile;
+  DWORD cbio = sizeof(DWORD);
+  DWORD previouslyWritten = 0, writtenThisSession = 0;
+  HANDLE hLocalFile;
+  bool completedFile = false;
+startnexttask:
+  hLocalFile = INVALID_HANDLE_VALUE;
+  pFile = NULL;
+  TaskLock_AcquireExclusive();
+  // Now that we've acquired the lock, we can set the event to indicate this.
+  // SetEvent will likely never fail, but if it does we should set it to NULL
+  // to avoid anyone waiting on it.
+  if (!SetEvent(g_hGETStartedEvent)) {
+    CloseHandle(g_hGETStartedEvent);
+    g_hGETStartedEvent = NULL;
+  }
+  pURL = g_pLocations;
+  if (pURL)
+  {
+    pFile = pURL->next;
+    g_pLocations = pFile->next;
+  }
+#ifndef ONELOCKTORULETHEMALL
+  StatsLock_AcquireExclusive();
+#endif
+  if (completedFile)
+  {
+    ++g_FilesCompleted;
+  }
+  completedFile = false;
+  g_cbCurrXF = 0;
+  g_cbCurrTot = FILESIZE_UNKNOWN;
+  if (!pURL)
+  {
+    if (g_FilesTotal)
+    {
+      if (g_FilesTotal == g_FilesCompleted)
+      {
+        g_Status = STATUS_COMPLETEDALL;
+      }
+    }
+    g_hThread = NULL;
+  }
+#ifndef ONELOCKTORULETHEMALL
+  StatsLock_ReleaseExclusive();
+#endif
+  TaskLock_ReleaseExclusive();
+
+  if (!pURL)
+  {
+    if (0)
+    {
+diegle:
+      DWORD gle = GetLastError();
+      //TODO? if (ERROR_INTERNET_EXTENDED_ERROR==gle) InternetGetLastResponseInfo(...)
+      g_Status = STATUS_ERR_GETLASTERROR;
+    }
+die:
+    if (g_hInetSes)
+    {
+      InternetCloseHandle(g_hInetSes);
+      g_hInetSes = nullptr;
+    }
+    if (INVALID_HANDLE_VALUE != hLocalFile)
+    {
+      CloseHandle(hLocalFile);
+    }
+    StackFreeItem(pURL);
+    StackFreeItem(pFile);
+    return 0;
+  }
+
+  if (!g_hInetSes)
+  {
+    g_hInetSes = InternetOpen(USERAGENT, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
+    if (!g_hInetSes)
+    {
+      TRACE(_T("InetBgDl: InternetOpen failed with gle=%u\n"),
+            GetLastError());
+      goto diegle;
+    }
+    InternetSetStatusCallback(g_hInetSes, (INTERNET_STATUS_CALLBACK)InetStatusCallback);
+
+    //msdn.microsoft.com/library/default.asp?url=/workshop/components/offline/offline.asp#Supporting Offline Browsing in Applications and Components
+    ULONG longOpt;
+    DWORD cbio = sizeof(ULONG);
+    if (InternetQueryOption(g_hInetSes, INTERNET_OPTION_CONNECTED_STATE, &longOpt, &cbio))
+    {
+      if (INTERNET_STATE_DISCONNECTED_BY_USER&longOpt)
+      {
+        INTERNET_CONNECTED_INFO ci = {INTERNET_STATE_CONNECTED, 0};
+        InternetSetOption(g_hInetSes, INTERNET_OPTION_CONNECTED_STATE, &ci, sizeof(ci));
+      }
+    }
+
+    // Change the default connect timeout if specified.
+    if(g_ConnectTimeout > 0)
+    {
+      InternetSetOption(g_hInetSes, INTERNET_OPTION_CONNECT_TIMEOUT,
+                        &g_ConnectTimeout, sizeof(g_ConnectTimeout));
+    }
+
+    // Change the default receive timeout if specified.
+    if (g_ReceiveTimeout)
+    {
+      InternetSetOption(g_hInetSes, INTERNET_OPTION_RECEIVE_TIMEOUT,
+                        &g_ReceiveTimeout, sizeof(DWORD));
+    }
+  }
+
+  DWORD ec = ERROR_SUCCESS;
+  hLocalFile = CreateFile(pFile->text, GENERIC_READ | GENERIC_WRITE,
+                          FILE_SHARE_READ | FILE_SHARE_DELETE,
+                          NULL, OPEN_ALWAYS, 0, NULL);
+  if (INVALID_HANDLE_VALUE == hLocalFile)
+  {
+    TRACE(_T("InetBgDl: CreateFile file handle invalid\n"));
+    goto diegle;
+  }
+  if (GetLastError() == ERROR_ALREADY_EXISTS) {
+    // Resuming a download that was started earlier and then aborted.
+    previouslyWritten = GetFileSize(hLocalFile, NULL);
+    g_cbCurrXF = previouslyWritten;
+    SetFilePointer(hLocalFile, previouslyWritten, NULL, FILE_BEGIN);
+  }
+
+  const DWORD IOURedirFlags = INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP |
+                              INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTPS;
+  const DWORD IOUCacheFlags = INTERNET_FLAG_RESYNCHRONIZE |
+                              INTERNET_FLAG_NO_CACHE_WRITE |
+                              INTERNET_FLAG_PRAGMA_NOCACHE |
+                              INTERNET_FLAG_RELOAD;
+  const DWORD IOUCookieFlags = INTERNET_FLAG_NO_COOKIES;
+  DWORD IOUFlags = IOURedirFlags | IOUCacheFlags | IOUCookieFlags |
+                   INTERNET_FLAG_NO_UI | INTERNET_FLAG_EXISTING_CONNECT;
+
+  TCHAR *hostname = (TCHAR*) GlobalAlloc(GPTR, MAX_STRLEN * sizeof(TCHAR)),
+        *urlpath = (TCHAR*) GlobalAlloc(GPTR, MAX_STRLEN * sizeof(TCHAR)),
+        *extrainfo = (TCHAR*) GlobalAlloc(GPTR, MAX_STRLEN * sizeof(TCHAR));
+
+  URL_COMPONENTS uc = { sizeof(URL_COMPONENTS), NULL, 0, (INTERNET_SCHEME)0,
+                        hostname, MAX_STRLEN, (INTERNET_PORT)0, NULL, 0,
+                        NULL, 0, urlpath, MAX_STRLEN, extrainfo, MAX_STRLEN};
+  uc.dwHostNameLength = uc.dwUrlPathLength = uc.dwExtraInfoLength = MAX_STRLEN;
+
+  if (!InternetCrackUrl(pURL->text, 0, ICU_ESCAPE, &uc))
+  {
+    // Bad url or param passed in
+    TRACE(_T("InetBgDl: InternetCrackUrl false with url=%s, gle=%u\n"),
+          pURL->text, GetLastError());
+    goto diegle;
+  }
+
+  TRACE(_T("InetBgDl: scheme_id=%d, hostname=%s, port=%d, urlpath=%s, extrainfo=%s\n"),
+        uc.nScheme, hostname, uc.nPort, urlpath, extrainfo);
+
+  // Only http and https are supported
+  if (uc.nScheme != INTERNET_SCHEME_HTTP &&
+      uc.nScheme != INTERNET_SCHEME_HTTPS)
+  {
+    TRACE(_T("InetBgDl: only http and https is supported, aborting...\n"));
+    goto diegle;
+  }
+
+  // Tell the server to pick up wherever we left off.
+  TCHAR headers[32];
+  // We're skipping building the C runtime to keep the file size low, so we
+  // can't use a normal string initialization because that would call memset.
+  headers[0] = _T('\0');
+  wsprintf(headers, _T("Range: bytes=%d-\r\n"), previouslyWritten);
+
+  TRACE(_T("InetBgDl: calling InternetOpenUrl with url=%s\n"), pURL->text);
+  g_hInetFile = InternetOpenUrl(g_hInetSes, pURL->text,
+                                headers, -1, IOUFlags |
+                                (uc.nScheme == INTERNET_SCHEME_HTTPS ?
+                                 INTERNET_FLAG_SECURE : 0), 1);
+  if (!g_hInetFile)
+  {
+    TRACE(_T("InetBgDl: InternetOpenUrl failed with gle=%u\n"),
+          GetLastError());
+    goto diegle;
+  }
+
+  // Get the file length via the Content-Length header
+  FILESIZE_T cbThisFile;
+  cbio = sizeof(cbThisFile);
+  if (!HttpQueryInfo(g_hInetFile,
+                     HTTP_QUERY_CONTENT_LENGTH | HTTP_QUERY_FLAG_NUMBER,
+                     &cbThisFile, &cbio, NULL))
+  {
+    cbThisFile = FILESIZE_UNKNOWN;
+  }
+  TRACE(_T("InetBgDl: file size=%d bytes\n"), cbThisFile);
+
+  // Use a 4MiB read buffer for the connection.
+  // Bigger buffers will be faster.
+  // cbReadBufXF should be a multiple of g_cbBufXF.
+  const UINT cbReadBufXF = 4194304;
+
+  // Up the default internal buffer size from 4096 to internalReadBufferSize.
+  DWORD internalReadBufferSize = cbReadBufXF;
+  if (!InternetSetOption(g_hInetFile, INTERNET_OPTION_READ_BUFFER_SIZE,
+                         &internalReadBufferSize, sizeof(DWORD)))
+  {
+    TRACE(_T("InetBgDl: InternetSetOption failed to set read buffer size to %u bytes, gle=%u\n"),
+          internalReadBufferSize, GetLastError());
+
+    // Maybe it's too big, try half of the optimal value.  If that fails just
+    // use the default.
+    internalReadBufferSize /= 2;
+    if (!InternetSetOption(g_hInetFile, INTERNET_OPTION_READ_BUFFER_SIZE,
+                           &internalReadBufferSize, sizeof(DWORD)))
+    {
+      TRACE(_T("InetBgDl: InternetSetOption failed to set read buffer size ") \
+            _T("to %u bytes (using default read buffer size), gle=%u\n"),
+            internalReadBufferSize, GetLastError());
+    }
+  }
+
+  for(;;)
+  {
+    DWORD cbio = 0, cbXF = 0;
+    BOOL retXF = InternetReadFile(g_hInetFile, g_bufXF, g_cbBufXF, &cbio);
+    if (!retXF)
+    {
+      ec = GetLastError();
+      TRACE(_T("InetBgDl: InternetReadFile failed, gle=%u\n"), ec);
+      if (ERROR_INTERNET_CONNECTION_ABORTED == ec ||
+          ERROR_INTERNET_CONNECTION_RESET == ec)
+      {
+        ec = ERROR_BROKEN_PIPE;
+      }
+      break;
+    }
+
+    if (0 == cbio)
+    {
+      ASSERT(ERROR_SUCCESS == ec);
+      // EOF or broken connection?
+      // TODO: Can InternetQueryDataAvailable detect this?
+
+      TRACE(_T("InetBgDl: InternetReadFile true with 0 cbio, cbThisFile=%d, gle=%u\n"),
+            cbThisFile, GetLastError());
+      // If we haven't transferred all of the file, and we know how big the file
+      // is, and we have no more data to read from the HTTP request, then set a
+      // broken pipe error. Reading without StatsLock is ok in this thread.
+      if (FILESIZE_UNKNOWN != cbThisFile && writtenThisSession != cbThisFile)
+      {
+        TRACE(_T("InetBgDl: expected Content-Length of %d bytes, ")
+              _T("but transferred %d bytes\n"),
+              cbThisFile, writtenThisSession);
+        ec = ERROR_BROKEN_PIPE;
+      }
+      break;
+    }
+
+    // Check if we canceled the download
+    if (0 == g_FilesTotal)
+    {
+      TRACE(_T("InetBgDl: 0 == g_FilesTotal, aborting transfer loop...\n"));
+      ec = ERROR_CANCELLED;
+      break;
+    }
+
+    cbXF = cbio;
+    if (cbXF)
+    {
+      retXF = WriteFile(hLocalFile, g_bufXF, cbXF, &cbio, NULL);
+      if (!retXF || cbXF != cbio)
+      {
+        ec = GetLastError();
+        break;
+      }
+
+      StatsLock_AcquireExclusive();
+      if (FILESIZE_UNKNOWN != cbThisFile) {
+        g_cbCurrTot = cbThisFile;
+      }
+      writtenThisSession += cbXF;
+      g_cbCurrXF += cbXF;
+      StatsLock_ReleaseExclusive();
+    }
+  }
+
+  TRACE(_T("InetBgDl: TaskThreadProc completed %s, ec=%u\n"), pURL->text, ec);
+  InternetCloseHandle(g_hInetFile);
+  g_hInetFile = nullptr;
+  if (ERROR_SUCCESS == ec)
+  {
+    if (INVALID_HANDLE_VALUE != hLocalFile)
+    {
+      CloseHandle(hLocalFile);
+      hLocalFile = INVALID_HANDLE_VALUE;
+    }
+    StackFreeItem(pURL);
+    StackFreeItem(pFile);
+    ++completedFile;
+  }
+  else if (ERROR_BROKEN_PIPE == ec)
+  {
+    g_Status = STATUS_ERR_CONNECTION_LOST;
+    goto die;
+  }
+  else
+  {
+    TRACE(_T("InetBgDl: failed with ec=%u\n"), ec);
+    SetLastError(ec);
+    goto diegle;
+  }
+  goto startnexttask;
+}
+
+NSISPIEXPORTFUNC Get(HWND hwndNSIS, UINT N_CCH, TCHAR*N_Vars, NSIS::stack_t**ppST, NSIS::xparams_t*pX)
+{
+  pX->RegisterPluginCallback(g_hInst, NSISPluginCallback);
+  for (;;)
+  {
+    NSIS::stack_t*pURL = StackPopItem(ppST);
+    if (!pURL)
+    {
+      break;
+    }
+
+    if (lstrcmpi(pURL->text, _T("/connecttimeout")) == 0)
+    {
+      NSIS::stack_t*pConnectTimeout = StackPopItem(ppST);
+      g_ConnectTimeout = MyTStrToL(pConnectTimeout->text) * 1000;
+      continue;
+    }
+    else if (lstrcmpi(pURL->text, _T("/receivetimeout")) == 0)
+    {
+      NSIS::stack_t*pReceiveTimeout = StackPopItem(ppST);
+      g_ReceiveTimeout = MyTStrToL(pReceiveTimeout->text) * 1000;
+      continue;
+    }
+    else if (lstrcmpi(pURL->text, _T("/reset")) == 0)
+    {
+      StackFreeItem(pURL);
+      Reset();
+      continue;
+    }
+    else if (lstrcmpi(pURL->text, _T("/end")) == 0)
+    {
+freeurlandexit:
+      StackFreeItem(pURL);
+      break;
+    }
+
+    NSIS::stack_t*pFile = StackPopItem(ppST);
+    if (!pFile)
+    {
+      goto freeurlandexit;
+    }
+
+    TaskLock_AcquireExclusive();
+
+    pFile->next = NULL;
+    pURL->next = pFile;
+    NSIS::stack_t*pTasksTail = g_pLocations;
+    while(pTasksTail && pTasksTail->next) pTasksTail = pTasksTail->next;
+    if (pTasksTail)
+    {
+      pTasksTail->next = pURL;
+    }
+    else
+    {
+      g_pLocations = pURL;
+    }
+
+    if (!g_hThread)
+    {
+      DWORD tid;
+      if (g_hGETStartedEvent) {
+        CloseHandle(g_hGETStartedEvent);
+      }
+      g_hGETStartedEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+      g_hThread = CreateThread(NULL, 0, TaskThreadProc, NULL, 0, &tid);
+    }
+
+    if (!g_hThread)
+    {
+      goto freeurlandexit;
+    }
+
+#ifndef ONELOCKTORULETHEMALL
+    StatsLock_AcquireExclusive();
+#endif
+    ++g_FilesTotal;
+#ifndef ONELOCKTORULETHEMALL
+    StatsLock_ReleaseExclusive();
+#endif
+    TaskLock_ReleaseExclusive();
+  }
+}
+
+NSISPIEXPORTFUNC GetStats(HWND hwndNSIS, UINT N_CCH, TCHAR*N_Vars, NSIS::stack_t**ppST, NSIS::xparams_t*pX)
+{
+  NSISPI_INITGLOBALS(N_CCH, N_Vars);
+  StatsLock_AcquireShared();
+  NSIS_SetRegUINT(0, g_Status);
+  NSIS_SetRegUINT(1, g_FilesCompleted);
+  NSIS_SetRegUINT(2, g_FilesTotal - g_FilesCompleted);
+  NSIS_SetRegUINT(3, g_cbCurrXF);
+  NSIS_SetRegStrEmpty(4);
+  if (FILESIZE_UNKNOWN != g_cbCurrTot)
+  {
+    NSIS_SetRegUINT(4, g_cbCurrTot);
+  }
+  NSIS_SetRegStr(5, g_ServerIP);
+  StatsLock_ReleaseShared();
+}
+
+BOOL WINAPI DllMain(HINSTANCE hInst, ULONG Reason, LPVOID pCtx)
+{
+  if (DLL_PROCESS_ATTACH==Reason)
+  {
+    g_hInst=hInst;
+    InitializeCriticalSection(&g_CritLock);
+  }
+  return TRUE;
+}