Add BWSB General Digital Music module loader.

Author: AliceLR

src/Makefile.am

@@ -38,6 +38,7 @@ libmodplug_la_SOURCES = tables.h         \
                         load_j2b.cpp       \
                         load_mt2.cpp       \
                         load_psm.cpp       \
+                        load_gdm.cpp       \
                         load_abc.cpp       \
                         load_mid.cpp       \
                         load_pat.cpp       \

src/libmodplug/sndfile.h

@@ -71,6 +71,7 @@ typedef const BYTE * LPCBYTE;
 #define MOD_TYPE_J2B		0x800000
 #define MOD_TYPE_ABC		0x1000000
 #define MOD_TYPE_PAT		0x2000000
+#define MOD_TYPE_GDM		0x40000000 // Fake type
 #define MOD_TYPE_UMX		0x80000000 // Fake type
 #define MAX_MODTYPE		24
 
@@ -652,6 +653,7 @@ class MODPLUG_EXPORT CSoundFile
 	BOOL ReadMT2(LPCBYTE lpStream, DWORD dwMemLength);
 	BOOL ReadPSM(LPCBYTE lpStream, DWORD dwMemLength);
 	BOOL ReadJ2B(LPCBYTE lpStream, DWORD dwMemLength);
+	BOOL ReadGDM(LPCBYTE lpStream, DWORD dwMemLength);
 	BOOL ReadUMX(LPCBYTE lpStream, DWORD dwMemLength);
 	BOOL ReadABC(LPCBYTE lpStream, DWORD dwMemLength);
 	BOOL TestABC(LPCBYTE lpStream, DWORD dwMemLength);