MADS: Add md5 checks for the asound.00* sound drivers

The implementation of the sound driver code relies on the data for each
sound being at specific locations in the files, so this ensures that
if any language version changes the sound files, we'll know about it

3 files changed, 42 insertions, 0 deletions

diff --git a/engines/mads/nebular/sound_nebular.cpp b/engines/mads/nebular/sound_nebular.cpp
index c540eb4382..a6dce74bba 100644
--- a/engines/mads/nebular/sound_nebular.cpp
+++ b/engines/mads/nebular/sound_nebular.cpp
@@ -24,6 +24,7 @@
 #include "audio/decoders/raw.h"
 #include "common/algorithm.h"
 #include "common/debug.h"
+#include "common/md5.h"
 #include "common/memstream.h"
 #include "mads/sound.h"
 #include "mads/nebular/sound_nebular.h"
@@ -218,6 +219,33 @@ ASound::~ASound() {
 	_mixer->stopHandle(_soundHandle);
 }
 
+void ASound::validate() {
+	byte digest[16];
+	Common::File f;
+	static const char *const MD5[] = {
+		"205398468de2c8873b7d4d73d5be8ddc",
+		"f9b2d944a2fb782b1af5c0ad592306d3",
+		"7431f8dad77d6ddfc24e6f3c0c4ac7df",
+		"eb1f3f5a4673d3e73d8ac1818c957cf4",
+		"f936dd853073fa44f3daac512e91c476",
+		"3dc139d3e02437a6d9b732072407c366",
+		"af0edab2934947982e9a405476702e03",
+		"8cbc25570b50ba41c9b5361cad4fbedc",
+		"a31e4783e098f633cbb6689adb41dd4f"
+	};
+
+	for (int i = 1; i <= 9; ++i) {
+		Common::String filename = Common::String::format("ASOUND.00%d", i);
+		if (!f.open(filename))
+			error("Could not process - %s", filename.c_str());
+		Common::String md5str = Common::computeStreamMD5AsString(f, 8192);
+		f.close();
+
+		if (md5str != MD5[i - 1])
+			error("Invalid sound file - %s", filename.c_str());
+	}
+}
+
 void ASound::adlibInit() {
 	write(4, 0x60);
 	write(4, 0x80);
diff --git a/engines/mads/nebular/sound_nebular.h b/engines/mads/nebular/sound_nebular.h
index abb6516030..ccfd40ad52 100644
--- a/engines/mads/nebular/sound_nebular.h
+++ b/engines/mads/nebular/sound_nebular.h
@@ -318,6 +318,11 @@ public:
 	virtual ~ASound();
 
 	/**
+	 * Validates the Adlib sound files
+	 */
+	static void validate();
+
+	/**
 	 * Execute a player command. Most commands represent sounds to play, but some
 	 * low number commands also provide control operations.
 	 * @param commandId		Player ommand to execute.
diff --git a/engines/mads/sound.cpp b/engines/mads/sound.cpp
index d0aa770a4d..1652550ba3 100644
--- a/engines/mads/sound.cpp
+++ b/engines/mads/sound.cpp
@@ -39,6 +39,15 @@ SoundManager::SoundManager(MADSEngine *vm, Audio::Mixer *mixer) {
 
 	_opl = OPL::Config::create();
 	_opl->init(11025);
+
+	// Validate sound files
+	switch (_vm->getGameID()) {
+	case GType_RexNebular:
+		Nebular::ASound::validate();
+		break;
+	default:
+		break;
+	}
 }
 
 SoundManager::~SoundManager() {