Possible fix for an infinite loop in LLTextureCache.

Backported a few changes from pre-LGPL Viewer 2.

1 files changed, 8 insertions, 5 deletions

diff --git a/linden/indra/newview/lltexturecache.cpp b/linden/indra/newview/lltexturecache.cpp
index 5548bc9..0ca235f 100644
--- a/linden/indra/newview/lltexturecache.cpp
+++ b/linden/indra/newview/lltexturecache.cpp
@@ -1169,7 +1169,7 @@ void LLTextureCache::readHeaderCache()
                         {
                                 Entry& entry = entries[i];
                                 const LLUUID& id = entry.mID;
-                                if (entry.mImageSize < 0)
+                                if (entry.mImageSize <= 0)
                                 {
                                         // This will be in the Free List, don't put it in the LRU
                                         ++empty_entries;
@@ -1182,7 +1182,7 @@ void LLTextureCache::readHeaderCache()
                                                 if (entry.mBodySize > entry.mImageSize)
                                                 {
                                                         // Shouldn't happen, failsafe only
-                                                        llwarns << "Bad entry: " << i << ": " << id << ": BodySize: " << entry.mBodySize << llendl;
+                                                        llwarns << "Bad entry: " << i << ": " << entry.mID << ": BodySize: " << entry.mBodySize << llendl;
                                                         purge_list.push_back(id);
                                                 }
                                         }
@@ -1193,15 +1193,17 @@ void LLTextureCache::readHeaderCache()
                                 // Special case: cache size was reduced, need to remove entries
                                 // Note: After we prune entries, we will call this again and create the LRU
                                 U32 entries_to_purge = (num_entries-empty_entries) - sCacheMaxEntries;
+                                llinfos << "Texture Cache Entries: " << num_entries << " Max: " << sCacheMaxEntries << " Empty: " << empty_entries << " Purging: " << entries_to_purge << llendl;
                                 if (entries_to_purge > 0)
                                 {
                                         for (std::set<lru_data_t>::iterator iter = lru.begin(); iter != lru.end(); ++iter)
                                         {
                                                 purge_list.push_back(iter->second);
-                                                if (--entries_to_purge <= 0)
+                                                if (purge_list.size() >= entries_to_purge)
                                                         break;
                                         }
                                 }
+                                llassert_always(purge_list.size() >= entries_to_purge);
                         }
                         else
                         {
@@ -1229,13 +1231,14 @@ void LLTextureCache::readHeaderCache()
                                 for (U32 i=0; i<num_entries; i++)
                                 {
                                         const Entry& entry = entries[i];
-                                        if (entry.mImageSize >=0)
+                                        if (entry.mImageSize > 0)
                                         {
                                                 new_entries.push_back(entry);
                                         }
                                 }
                                 llassert_always(new_entries.size() <= sCacheMaxEntries);
                                 mHeaderEntriesInfo.mEntries = new_entries.size();
+                                writeEntriesHeader();
                                 writeEntriesAndClose(new_entries);
                                 mHeaderMutex.unlock(); // unlock the mutex before calling again
                                 readHeaderCache(); // repeat with new entries file
@@ -1243,7 +1246,7 @@ void LLTextureCache::readHeaderCache()
                         }
                         else
                         {
-                                writeEntriesAndClose(entries);
+                                //entries are not changed, nothing here.
                         }
                 }
         }