Limit selection length for Nyquist plug-ins

This can improve progress count for Nyquist effects
that do not process all of selection (bug 558) and provides some
protection against 2^31 overflow issues (bug 439).

src/effects/nyquist/Nyquist.cpp

@@ -79,6 +79,9 @@ enum
    ID_Choice = 13000
 };
 
+// Protect Nyquist from selections greater than 2^31 samples (bug 439)
+#define NYQ_MAX_LEN ((sampleCount) 2147483647)
+
 #define UNINITIALIZED_CONTROL ((double)99999999.99)
 
 static const wxChar *KEY_Version = XO("Version");
@@ -130,6 +133,8 @@ NyquistEffect::NyquistEffect(wxString fName)
    mBreak = false;
    mCont = false;
 
+   mMaxLen = NYQ_MAX_LEN;
+
    // Interactive Nyquist
    if (fName == NYQUIST_PROMPT_ID)
    {
@@ -379,6 +384,7 @@ bool NyquistEffect::Init()
       {
          SaveUserPreset(GetCurrentSettingsGroup());
 
+         mMaxLen = NYQ_MAX_LEN;
          ParseFile();
          mFileModified = mFileName.GetModificationTime();
 
@@ -577,6 +583,14 @@ bool NyquistEffect::Process()
          sampleCount end = mCurTrack[0]->TimeToLongSamples(mT1);
          mCurLen = (sampleCount)(end - mCurStart[0]);
 
+         if (mCurLen > NYQ_MAX_LEN) {
+            wxMessageBox(_("Selection too long for Nyquist code.\nMaximum allowed selection is 2147483647 samples\n(about 13.5 hours at 44100 Hz sample rate)."),
+                         _("Nyquist Error"), wxOK | wxCENTRE);
+            return false;
+         }
+
+         if (mCurLen > mMaxLen) mCurLen = mMaxLen;
+
          mProgressIn = 0.0;
          mProgressOut = 0.0;
 
@@ -1401,6 +1415,14 @@ void NyquistEffect::Parse(wxString line)
       return;
    }
 
+   // Maximum number of samples to be processed. This can help the
+   // progress bar if effect does not process all of selection.
+   if (len >= 2 && tokens[0] == wxT("maxlen")) {
+      long long v; // Note that Nyquist may overflow at > 2^31 samples (bug 439)
+      tokens[1].ToLongLong(&v);
+      mMaxLen = (sampleCount) v;
+   }
+
 #if defined(EXPERIMENTAL_NYQUIST_SPLIT_CONTROL)
    if (len >= 2 && tokens[0] == wxT("mergeclips")) {
       long v;

src/effects/nyquist/Nyquist.h

@@ -205,6 +205,7 @@ private:
    WaveTrack         *mCurTrack[2];
    sampleCount       mCurStart[2];
    sampleCount       mCurLen;
+   sampleCount       mMaxLen;
    int               mTrackIndex;
    bool              mFirstInGroup;
    double            mOutputTime;