From a3e5ff8142cf3530cddcb27b58f871f387796ab6 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <sezeroz@gmail.com>
Date: Sat, 6 Oct 2018 23:20:10 +0300
Subject: [PATCH] multiple mikmod player fixes from default (2.0) branch

---
 CHANGES       |  4 ++++
 dynamic_mod.c | 17 +++++++++++++++--
 dynamic_mod.h | 12 ++++++++++--
 music_mod.c   | 15 +++++++++++----
 4 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/CHANGES b/CHANGES
index 9eb53f37..c116b3d4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+1.2.13:
+Paul P Komkoff Jr - Sun Jul 22 16:12:28 PDT 2012
+ * Fixed malloc/free mismatch in the MikMod driver
+
 1.2.12:
 Sam Lantinga - Sat Jan 14 22:00:29 2012 -0500
  * Fixed seek offset with SMPEG (was relative, should be absolute)
diff --git a/dynamic_mod.c b/dynamic_mod.c
index 7e3cd0af..82168eb5 100644
--- a/dynamic_mod.c
+++ b/dynamic_mod.c
@@ -59,7 +59,7 @@ int Mix_InitMOD()
 			return -1;
 		}
 		mikmod.MikMod_Init =
-			(BOOL (*)(CHAR*))
+			(int (*)(MIKMOD3_CONST CHAR*))
 			SDL_LoadFunction(mikmod.handle, "MikMod_Init");
 		if ( mikmod.MikMod_Init == NULL ) {
 			SDL_UnloadObject(mikmod.handle);
@@ -87,12 +87,19 @@ int Mix_InitMOD()
 			return -1;
 		}
 		mikmod.MikMod_strerror =
-			(char* (*)(int))
+			(MIKMOD3_CONST char* (*)(int))
 			SDL_LoadFunction(mikmod.handle, "MikMod_strerror");
 		if ( mikmod.MikMod_strerror == NULL ) {
 			SDL_UnloadObject(mikmod.handle);
 			return -1;
 		}
+		mikmod.MikMod_free =
+			(void (*)(void*))
+			SDL_LoadFunction(mikmod.handle, "MikMod_free");
+		if ( mikmod.MikMod_free == NULL ) {
+			/* libmikmod 3.1 and earlier doesn't have it */
+			mikmod.MikMod_free = free;
+		}
 		mikmod.Player_Active =
 			(BOOL (*)(void))
 			SDL_LoadFunction(mikmod.handle, "Player_Active");
@@ -239,6 +246,12 @@ int Mix_InitMOD()
 		mikmod.MikMod_RegisterDriver = MikMod_RegisterDriver;
 		mikmod.MikMod_errno = &MikMod_errno;
 		mikmod.MikMod_strerror = MikMod_strerror;
+#if (LIBMIKMOD_VERSION < 0x030200) || !defined(DMODE_NOISEREDUCTION)
+		/* libmikmod 3.2.0-beta2 or older */
+		mikmod.MikMod_free = free;
+#else
+		mikmod.MikMod_free = MikMod_free;
+#endif
 		mikmod.Player_Active = Player_Active;
 		mikmod.Player_Free = Player_Free;
 		mikmod.Player_LoadGeneric = Player_LoadGeneric;
diff --git a/dynamic_mod.h b/dynamic_mod.h
index 3561b151..b679cc72 100644
--- a/dynamic_mod.h
+++ b/dynamic_mod.h
@@ -23,6 +23,13 @@
 
 #include "mikmod.h"
 
+/* libmikmod >= 3.3.2 constified several funcs */
+#if (LIBMIKMOD_VERSION < 0x030302)
+#define MIKMOD3_CONST
+#else
+#define MIKMOD3_CONST const
+#endif
+
 typedef struct {
 	int loaded;
 	void *handle;
@@ -30,11 +37,12 @@ typedef struct {
 	void (*MikMod_Exit)(void);
 	CHAR* (*MikMod_InfoDriver)(void);
 	CHAR* (*MikMod_InfoLoader)(void);
-	BOOL (*MikMod_Init)(CHAR*);
+	int (*MikMod_Init)(MIKMOD3_CONST CHAR*);
 	void (*MikMod_RegisterAllLoaders)(void);
 	void (*MikMod_RegisterDriver)(struct MDRIVER*);
 	int* MikMod_errno;
-	char* (*MikMod_strerror)(int);
+	MIKMOD3_CONST char* (*MikMod_strerror)(int);
+	void (*MikMod_free)(void*);
 	BOOL (*Player_Active)(void);
 	void (*Player_Free)(MODULE*);
 	MODULE* (*Player_LoadGeneric)(MREADER*,int,BOOL);
diff --git a/music_mod.c b/music_mod.c
index be179022..ecd9d5ee 100644
--- a/music_mod.c
+++ b/music_mod.c
@@ -109,13 +109,13 @@ int MOD_init(SDL_AudioSpec *mixerfmt)
 
 	list = mikmod.MikMod_InfoDriver();
 	if ( list )
-	  free(list);
+	  mikmod.MikMod_free(list);
 	else
 	  mikmod.MikMod_RegisterDriver(mikmod.drv_nos);
 
 	list = mikmod.MikMod_InfoLoader();
 	if ( list )
-	  free(list);
+	  mikmod.MikMod_free(list);
 	else
 	  mikmod.MikMod_RegisterAllLoaders();
 
@@ -144,18 +144,25 @@ void MOD_setvolume(MODULE *music, int volume)
 typedef struct
 {
 	MREADER mr;
+	/* struct MREADER in libmikmod <= 3.2.0-beta2
+	 * doesn't have iobase members. adding them here
+	 * so that if we compile against 3.2.0-beta2, we
+	 * can still run OK against 3.2.0b3 and newer. */
+	long iobase, prev_iobase;
 	long offset;
 	long eof;
 	SDL_RWops *rw;
 } LMM_MREADER;
 
-BOOL LMM_Seek(struct MREADER *mr,long to,int dir)
+int LMM_Seek(struct MREADER *mr,long to,int dir)
 {
 	LMM_MREADER* lmmmr = (LMM_MREADER*)mr;
 	if ( dir == SEEK_SET ) {
 		to += lmmmr->offset;
+		if (to < lmmmr->offset)
+			return -1;
 	}
-	return (SDL_RWseek(lmmmr->rw, to, dir) < lmmmr->offset);
+	return (SDL_RWseek(lmmmr->rw, to, dir) < lmmmr->offset)? -1 : 0;
 }
 long LMM_Tell(struct MREADER *mr)
 {