Merge pull request #31 from hannob/master

Fix bugs when reading empty files

Author: Konstanty

src/load_mid.cpp

@@ -751,6 +751,7 @@ BOOL CSoundFile::TestMID(const BYTE *lpStream, DWORD dwMemLength)
 	mm.mm = (char *)lpStream;
 	mm.sz = dwMemLength;
 	h.mmf = &mm;
+	if (h.mmf->sz < 4) return FALSE;
 	mmfseek(h.mmf,0,SEEK_SET);
 	mmreadSBYTES(id, 4, h.mmf);
 	id[4] = '\0';

src/load_psm.cpp

@@ -105,11 +105,12 @@ BOOL CSoundFile::ReadPSM(LPCBYTE lpStream, DWORD dwMemLength)
 	BYTE samplemap[MAX_SAMPLES];
 	UINT nPatterns;
 
+	if (dwMemLength < 256) return FALSE;
+
 	// Swap chunk
 	swap_PSMCHUNK(pfh);
 
 	// Chunk0: "PSM ",filesize,"FILE"
-	if (dwMemLength < 256) return FALSE;
 	if (pfh->id == PSM_ID_OLD)
 	{
 	#ifdef PSM_LOG