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 8d0c78047a72347b37785170e7e42f3f8eb8e60c..256b3e1711edccf909ace0a5e80fee6305e8f156 100644
--- a/content/browser/indexed_db/indexed_db_leveldb_coding.h
+++ b/content/browser/indexed_db/indexed_db_leveldb_coding.h
@@ -96,6 +96,7 @@ class KeyPrefix {
     DATABASE_METADATA,
     OBJECT_STORE_DATA,
     EXISTS_ENTRY,
+    BLOB_ENTRY,

[jsbell, 2013/12/20 00:44:20]

Needs to be appended, since these are serialized - see Compare()

We should add a comment.

[ericu, 2014/02/20 00:50:29]

Done.

     INDEX_DATA,
     INVALID_TYPE
   };
@@ -171,6 +172,16 @@ class DataVersionKey {
   static std::string Encode();
 };
 
+class BlobJournalKey {
+ public:
+  static std::string Encode();
+};
+
+class LiveBlobJournalKey {
+ public:
+  static std::string Encode();
+};
+
 class DatabaseFreeListKey {
  public:
   DatabaseFreeListKey();
@@ -210,9 +221,15 @@ 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);
 };
@@ -383,6 +400,37 @@ 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 ReencodeToObjectStoreDataKey(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();