+ Support for MPQs that have invalid (and ignored) flags in the block table

+ Support for MPQs that have malformed block indexes (0x8000xxxx or 0x4000xxxx)

4 files changed, 24 insertions, 11 deletions

diff --git a/src/SBaseFileTable.cpp b/src/SBaseFileTable.cpp
index b38dbc3..9d37ff1 100644
--- a/src/SBaseFileTable.cpp
+++ b/src/SBaseFileTable.cpp
@@ -581,23 +581,33 @@ int ConvertMpqHeaderToFormat4(
 // Hash entry verification when the file table does not exist yet

 bool IsValidHashEntry(TMPQArchive * ha, TMPQHash * pHash)

 {

-    TFileEntry * pFileEntry = ha->pFileTable + pHash->dwBlockIndex;

-    return ((pHash->dwBlockIndex < ha->dwFileTableSize) && (pFileEntry->dwFlags & MPQ_FILE_EXISTS)) ? true : false;

+    TFileEntry * pFileEntry = ha->pFileTable + MPQ_BLOCK_INDEX(pHash->dwBlockIndex);

+    DWORD dwBlockIndex = MPQ_BLOCK_INDEX(pHash->dwBlockIndex);

+    

+    pFileEntry = ha->pFileTable + dwBlockIndex;

+    return ((dwBlockIndex < ha->dwFileTableSize) && (pFileEntry->dwFlags & MPQ_FILE_EXISTS)) ? true : false;

 }

 

 // Hash entry verification when the file table does not exist yet

 static bool IsValidHashEntry1(TMPQArchive * ha, TMPQHash * pHash, TMPQBlock * pBlockTable)

 {

     ULONGLONG ByteOffset;    

-    TMPQBlock * pBlock = pBlockTable + pHash->dwBlockIndex;

+    TMPQBlock * pBlock;

+    DWORD dwBlockIndex;

 

     // We need to mask out the upper 4 bits of the block table index.

     // This is because it gets shifted out when calculating block table offset

     // BlockTableOffset = pHash->dwBlockIndex * 0x10

     // Malformed MPQ maps may contain invalid entries

     // Note that Storm.dll does not perfom this check

-    if((pHash->dwBlockIndex & 0x0FFFFFFF) < ha->pHeader->dwBlockTableSize)

+    dwBlockIndex = MPQ_BLOCK_INDEX(pHash->dwBlockIndex);

+

+    // The block index is considered valid if it's less than block table size

+    if(dwBlockIndex < ha->pHeader->dwBlockTableSize)

     {

+        // Calculate the block table position

+        pBlock = pBlockTable + dwBlockIndex;

+

         // Check whether this is an existing file

         // Also we do not allow to be file size greater than 2GB

         if((pBlock->dwFlags & MPQ_FILE_EXISTS) && (pBlock->dwFSize & 0x8000000) == 0)

@@ -783,8 +793,8 @@ static int BuildFileTableFromBlockTable(
 

         if(IsValidHashEntry1(ha, pHash, pBlockTable))

         {

-            DWORD dwBlockIndex = pHash->dwBlockIndex;

-            DWORD dwNewIndex = pHash->dwBlockIndex;

+            DWORD dwBlockIndex = MPQ_BLOCK_INDEX(pHash->dwBlockIndex);

+            DWORD dwNewIndex = MPQ_BLOCK_INDEX(pHash->dwBlockIndex);

 

             // Determine the new block index

             if(DefragmentTable != NULL)

diff --git a/src/SFileOpenArchive.cpp b/src/SFileOpenArchive.cpp
index 6a249f2..2cb6698 100644
--- a/src/SFileOpenArchive.cpp
+++ b/src/SFileOpenArchive.cpp
@@ -369,8 +369,8 @@ bool WINAPI SFileOpenArchive(
         // higher than 0x10000000, it would overflow in 32-bit version
         // Observed in the malformed Warcraft III maps
         // Example map: MPQ_2016_v1_ProtectedMap_TableSizeOverflow.w3x
-        ha->pHeader->dwHashTableSize &= 0x0FFFFFFF;
-        ha->pHeader->dwBlockTableSize &= 0x0FFFFFFF;
+        ha->pHeader->dwBlockTableSize = MPQ_BLOCK_INDEX(ha->pHeader->dwBlockTableSize);
+        ha->pHeader->dwHashTableSize = MPQ_BLOCK_INDEX(ha->pHeader->dwHashTableSize);
 
         // Both MPQ_OPEN_NO_LISTFILE or MPQ_OPEN_NO_ATTRIBUTES trigger read only mode
         if(dwFlags & (MPQ_OPEN_NO_LISTFILE | MPQ_OPEN_NO_ATTRIBUTES))
diff --git a/src/SFileOpenFileEx.cpp b/src/SFileOpenFileEx.cpp
index 3794680..afbfc78 100644
--- a/src/SFileOpenFileEx.cpp
+++ b/src/SFileOpenFileEx.cpp
@@ -309,8 +309,10 @@ bool WINAPI SFileOpenFileEx(HANDLE hMpq, const char * szFileName, DWORD dwSearch
     {
         if(pFileEntry == NULL || (pFileEntry->dwFlags & MPQ_FILE_EXISTS) == 0)
             nError = ERROR_FILE_NOT_FOUND;
-        if(pFileEntry != NULL && pFileEntry->dwFlags & ~MPQ_FILE_VALID_FLAGS)
-            nError = ERROR_NOT_SUPPORTED;
+
+        // Ignore unknown loading flags (example: MPQ_2016_v1_WME4_4.w3x)
+//      if(pFileEntry != NULL && pFileEntry->dwFlags & ~MPQ_FILE_VALID_FLAGS)
+//          nError = ERROR_NOT_SUPPORTED;
     }
 
     // Did the caller just wanted to know if the file exists?
diff --git a/src/StormLib.h b/src/StormLib.h
index 22658bd..c25a1a8 100644
--- a/src/StormLib.h
+++ b/src/StormLib.h
@@ -218,7 +218,6 @@ extern "C" {
 #define MPQ_FILE_REPLACEEXISTING    0x80000000  // Replace when the file exist (SFileAddFile)
 
 #define MPQ_FILE_COMPRESS_MASK      0x0000FF00  // Mask for a file being compressed
-#define MPQ_FILE_EXISTS_MASK        0xF00000FF  // These must be either zero or MPQ_FILE_EXISTS
 
 #define MPQ_FILE_VALID_FLAGS     (MPQ_FILE_IMPLODE       |  \
                                   MPQ_FILE_COMPRESS      |  \
@@ -231,6 +230,8 @@ extern "C" {
                                   MPQ_FILE_SIGNATURE     |  \
                                   MPQ_FILE_EXISTS)
 
+#define MPQ_BLOCK_INDEX(bi) ((bi) & 0x0FFFFFFF) // Index mask for block table index
+
 // Compression types for multiple compressions
 #define MPQ_COMPRESSION_HUFFMANN          0x01  // Huffmann compression (used on WAVE files only)
 #define MPQ_COMPRESSION_ZLIB              0x02  // ZLIB compression