MT32: Add SHA1 file digest checking in getROMInfo()

This ensures that the capabilities of the detected ROM files are
set properly from the list of known ROMs. This is mostly needed
for the extra samples of the CM32-L ROMs

audio/softsynth/mt32/ROMInfo.cpp

@@ -17,6 +17,7 @@
 
 //#include <cstring>
 #include "ROMInfo.h"
+#include "sha1/sha1.h"
 
 namespace MT32Emu {
 
@@ -52,14 +53,27 @@ static const ROMInfo *getKnownROMInfoFromList(unsigned int index) {
 	return ROM_INFOS[index];
 }
 
+static void getSHA1(Common::File *file, char *fileDigest) {
+	size_t fileSize = file->size();
+	byte *data = new byte[fileSize];
+	file->read(data, fileSize);
+	file->seek(0);
+	SHA1 sha1;
+	uint intDigest[5];
+	sha1.Input((const char *)data, fileSize);
+	if (sha1.Result(intDigest))
+		sprintf(fileDigest, "%08x%08x%08x%08x%08x", intDigest[0], intDigest[1], intDigest[2], intDigest[3], intDigest[4]);
+	delete[] data;
+}
+
 const ROMInfo* ROMInfo::getROMInfo(Common::File *file) {
 	size_t fileSize = file->size();
-	// We haven't added the SHA1 checksum code in ScummVM, as the file size
-	// suffices for our needs for now.
-	//const char *fileDigest = file->getSHA1();
+	char fileDigest[41];	// Includes terminator char
+	getSHA1(file, fileDigest);
+
 	for (int i = 0; getKnownROMInfoFromList(i) != NULL; i++) {
 		const ROMInfo *romInfo = getKnownROMInfoFromList(i);
-		if (fileSize == romInfo->fileSize /*&& !strcmp(fileDigest, romInfo->sha1Digest)*/) {
+		if (fileSize == romInfo->fileSize && !strcmp(fileDigest, romInfo->sha1Digest)) {
 			return romInfo;
 		}
 	}