Blob support for IDB [Chromium]

content/browser/indexed_db/indexed_db_leveldb_coding.h

Index: content/browser/indexed_db/indexed_db_leveldb_coding.h
diff --git a/content/browser/indexed_db/indexed_db_leveldb_coding.h b/content/browser/indexed_db/indexed_db_leveldb_coding.h
index 974c27a4fa2bc7b06010a5cbad44d67f915cf79b..ec18e18582bf064187477da18f261371e33542ad 100644
--- a/content/browser/indexed_db/indexed_db_leveldb_coding.h
+++ b/content/browser/indexed_db/indexed_db_leveldb_coding.h
@@ -93,6 +93,7 @@ class KeyPrefix {
     DATABASE_METADATA,
     OBJECT_STORE_DATA,
     EXISTS_ENTRY,
+    BLOB_ENTRY,
     INDEX_DATA,
     INVALID_TYPE
   };
@@ -168,6 +169,16 @@ class DataVersionKey {
   static std::string Encode();
 };
 
+class BlobJournalKey {
+ public:
+  static std::string Encode();
+};
+
+class LiveBlobJournalKey {
+ public:
+  static std::string Encode();
+};
+
 class DatabaseFreeListKey {
  public:
   DatabaseFreeListKey();
@@ -207,9 +218,15 @@ class DatabaseMetaDataKey {
     USER_VERSION = 2,
     MAX_OBJECT_STORE_ID = 3,
     USER_INT_VERSION = 4,
-    MAX_SIMPLE_METADATA_TYPE = 5
+    BLOB_KEY_GENERATOR_CURRENT_NUMBER = 5,
+    MAX_SIMPLE_METADATA_TYPE = 6
   };
 
+  static const int64 kAllBlobsKey = 1;
+  static const int64 kBlobKeyGeneratorInitialNumber = 2;
+  static const int64 kInvalidBlobKey = -1; // All keys <= 0 are invalid.
+
+  static bool IsValidBlobKey(int64 blobKey);
   CONTENT_EXPORT static std::string Encode(int64 database_id,
                                            MetaDataType type);
 };
@@ -380,6 +397,41 @@ class ExistsEntryKey {
   DISALLOW_COPY_AND_ASSIGN(ExistsEntryKey);
 };
 
+class BlobEntryKey {
+public:
+    BlobEntryKey()
+        : database_id_(0),
+          object_store_id_(0)
+    {
+    }
+    static bool Decode(base::StringPiece* slice, BlobEntryKey* result);
+    static bool FromObjectStoreDataKey(base::StringPiece* slice,
+                                       BlobEntryKey* result);
+    static std::string EncodeToObjectStoreDataKey(base::StringPiece* slice);
+    static std::string EncodeMinForObjectStore(int64 database_id,
+                                               int64 object_store_id);
+    static std::string EncodeMaxForObjectStore(int64 database_id,
+                                               int64 object_store_id);
+    static std::string Encode(int64 database_id,
+                              int64 object_store_id,
+                              const IndexedDBKey& user_key);
+    std::string Encode() const;
+    int64 database_id() const { return database_id_; }
+    int64 object_store_id() const { return object_store_id_; }
+    int Compare(const BlobEntryKey& other, bool* ok);
+
+    static const int64 kSpecialIndexNumber;
+
+private:
+    static std::string Encode(int64 database_id,
+                              int64 object_store_id,
+                              const std::string& encoded_user_key);
+    int64 database_id_;
+    int64 object_store_id_;
+    // This is the user's ObjectStoreDataKey, not the BlobEntryKey itself.
+    std::string encoded_user_key_;
+};
+
 class IndexDataKey {
  public:
   IndexDataKey();