apply patch #609508 real fix for MI2 Dialog Box crash, by CCCP at Endy's request

svn-id: r4943

3 files changed, 31 insertions, 8 deletions

diff --git a/common/str.cpp b/common/str.cpp
index 1229c14566..85ceb965d4 100644
--- a/common/str.cpp
+++ b/common/str.cpp
@@ -20,15 +20,15 @@
 
 #include "stdafx.h"
 #include "str.h"
-
+#include "util.h"
 
 namespace ScummVM {
 
 String::String(const char *str)
 {
 	_refCount = new int(1);
-	if (str) {
-		_capacity = _len = strlen(str);
+	if (str) {		
+		_capacity = _len = resStrLen(str);
 		_str = (char *)calloc(1, _capacity+1);
 		memcpy(_str, str, _len+1);
 	} else {
@@ -41,8 +41,8 @@ String::String(const ConstString &str)
 {
 	printf("String::String(const ConstString &str)\n");
 	_refCount = new int(1);
-	if (str._str) {
-		_capacity = _len = strlen(str._str);
+	if (str._str) {		
+		_capacity = _len = resStrLen(str._str);
 		_str = (char *)calloc(1, _capacity+1);
 		memcpy(_str, str._str, _len+1);
 	} else {
@@ -77,8 +77,8 @@ void String::decRefCount()
 }
 
 String& String::operator  =(const char* str)
-{
-	int len = strlen(str);
+{	
+	int len = resStrLen(str);
 	if (len > 0) {
 		ensureCapacity(len, false);
 		
@@ -111,7 +111,7 @@ String& String::operator  =(const String& str)
 
 String& String::operator +=(const char* str)
 {
-	int len = strlen(str);
+	int len = resStrLen(str);
 	if (len > 0) {
 		ensureCapacity(_len + len, true);
 
diff --git a/common/util.cpp b/common/util.cpp
index 7ff4a9e032..86711866c9 100644
--- a/common/util.cpp
+++ b/common/util.cpp
@@ -120,3 +120,23 @@ void hexdump(const byte * data, int len)
 		printf(" ");
 	printf("|\n");
 }
+
+// Resource string length, supports special chars starting with FF
+int resStrLen(const char *src)
+{
+	int num = 0;
+	byte chr;
+	while ((chr = *src++) != 0) {
+		num++;
+		if (chr == 255) {
+			chr = *src++;
+			num++;
+
+			if (chr != 1 && chr != 2 && chr != 3 && chr != 8) {
+				src += 2;
+				num += 2;
+			}
+		}
+	}
+	return num;
+}
diff --git a/common/util.h b/common/util.h
index afaf2acaf4..79a6eb1068 100644
--- a/common/util.h
+++ b/common/util.h
@@ -48,4 +48,7 @@ void ClearBlendCache(byte *palette, int weight);
  */
 void hexdump(const byte * data, int len);
 
+// Resource string length
+int resStrLen(const char *src);
+
 #endif