LoadSpectSeq: use an fread API to read wxInputStream data

This creates an fread compatible API on wxInputStream objects and
uses that API in LoadSpectSeq. This is to help the transition from
the wxWidgets wxInputStream API to the C FILE API.

src/spect.cpp

 #include "wx/txtstrm.h"
 #include "wx/datstrm.h"
 
+#include <math.h>
+#include <stdint.h>
 
 extern "C" int PeaksToHarmspect(wavegen_peaks_t *peaks, int pitch, int *htab, int control);
 
 #define DRAWPEAKWIDTH 2000
 #define PEAKSHAPEW 256
 
-#include <math.h>
-
-
 static int default_freq[N_PEAKS] =
 	{200,500,1200,3000,3500,4000,6900,7800,9000};
 static int default_width[N_PEAKS] =
 static int default_klt_bw[N_PEAKS] =
 	{89,90,140,260,260,260,500,500,500};
 
+static void fread(void *ptr, int size, int count, wxInputStream &stream)
+{
+	stream.Read(ptr, count*size);
+}
 
 float polint(float xa[],float ya[],int n,float x)
 {//==============================================
 
 int LoadSpectSeq(SpectSeq *spect, const char *filename)
 {//=======================================
-	int n;
+	short n, temp;
 	int ix;
-	unsigned int id1, id2;
+	uint32_t id1, id2, name_len;
 	int set_max_y=0;
 	float time_offset;
 
 		return(0);
 	}
 
-	wxDataInputStream s(stream);
-
-	id1 = s.Read32();
-	id2 = s.Read32();
+	fread(&id1,sizeof(uint32_t),1,stream);
+	fread(&id2,sizeof(uint32_t),1,stream);
 
 	if((id1 == FILEID1_SPECTSEQ) && (id2 == FILEID2_SPECTSEQ))
 	{
 		return(1);
 	}
 
-	wxString name = s.ReadString();
-	n = s.Read16();
-	spect->amplitude = s.Read16();
-	spect->max_y = s.Read16();
-	s.Read16();
+	fread(&name_len,sizeof(uint32_t),1,stream);
+	if (name_len > 0)
+	{
+		spect->name = (char *)malloc(name_len);
+		fread(spect->name,sizeof(char),name_len,stream);
+	}
+	else
+		spect->name = NULL;
 
-	free(spect->name);
-	spect->name = strdup(name.mb_str(wxConvLocal));
+	fread(&n,sizeof(short),1,stream);
+	fread(&spect->amplitude,sizeof(short),1,stream);
+	fread(&spect->max_y,sizeof(short),1,stream);
+	fread(&temp,sizeof(short),1,stream); // unused
 
 	if(n==0) return(0);
 

src/spect.h

 struct SpectSeq
 {
 	int  numframes;
-	int  amplitude;
+	short amplitude;
 	int  spare;
 	char *name;
 
 	int  grid;
 	int  bass_reduction;
 	int max_x;
-	int max_y;
+	short max_y;
 	int file_format;
 };