1 files changed, 153 insertions, 0 deletions
diff --git a/dom/cache/FileUtils.h b/dom/cache/FileUtils.h
new file mode 100644
index 0000000000..e22a08908d
--- /dev/null
+++ b/dom/cache/FileUtils.h
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_cache_FileUtils_h
+#define mozilla_dom_cache_FileUtils_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/cache/Types.h"
+#include "CacheCommon.h"
+#include "mozIStorageConnection.h"
+#include "nsStreamUtils.h"
+#include "nsTArrayForwardDeclare.h"
+
+struct nsID;
+class nsIFile;
+
+namespace mozilla::dom::cache {
+
+#define PADDING_FILE_NAME u".padding"
+#define PADDING_TMP_FILE_NAME u".padding-tmp"
+
+enum class DirPaddingFile { FILE, TMP_FILE };
+
+nsresult BodyCreateDir(nsIFile& aBaseDir);
+
+// Note that this function can only be used during the initialization of the
+// database.  We're unlikely to be able to delete the DB successfully past
+// that point due to the file being in use.
+nsresult BodyDeleteDir(const CacheDirectoryMetadata& aDirectoryMetadata,
+                       nsIFile& aBaseDir);
+
+// Returns a Result with a success value with the body id and, optionally, the
+// copy context.
+Result<std::pair<nsID, nsCOMPtr<nsISupports>>, nsresult> BodyStartWriteStream(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aBaseDir,
+    nsIInputStream& aSource, void* aClosure, nsAsyncCopyCallbackFun aCallback);
+
+void BodyCancelWrite(nsISupports& aCopyContext);
+
+nsresult BodyFinalizeWrite(nsIFile& aBaseDir, const nsID& aId);
+
+Result<MovingNotNull<nsCOMPtr<nsIInputStream>>, nsresult> BodyOpen(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aBaseDir,
+    const nsID& aId);
+
+nsresult BodyMaybeUpdatePaddingSize(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aBaseDir,
+    const nsID& aId, uint32_t aPaddingInfo, int64_t* aPaddingSizeInOut);
+
+nsresult BodyDeleteFiles(const CacheDirectoryMetadata& aDirectoryMetadata,
+                         nsIFile& aBaseDir, const nsTArray<nsID>& aIdList);
+
+nsresult BodyDeleteOrphanedFiles(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aBaseDir,
+    const nsTArray<nsID>& aKnownBodyIdList);
+
+// If aCanRemoveFiles is true, that means we are safe to touch the files which
+// can be accessed in other threads.
+// If it's not, that means we cannot remove the files which are possible to
+// created by other threads. Note that if the files are not expected, we should
+// be safe to remove them in any case.
+template <typename Func>
+nsresult BodyTraverseFiles(
+    const Maybe<CacheDirectoryMetadata>& aDirectoryMetadata, nsIFile& aBodyDir,
+    const Func& aHandleFileFunc, bool aCanRemoveFiles, bool aTrackQuota = true);
+
+// XXX Remove this method when all callers properly wrap aClientMetadata with
+// Some/Nothing
+template <typename Func>
+nsresult BodyTraverseFiles(const CacheDirectoryMetadata& aDirectoryMetadata,
+                           nsIFile& aBodyDir, const Func& aHandleFileFunc,
+                           bool aCanRemoveFiles, bool aTrackQuota = true) {
+  return BodyTraverseFiles(Some(aDirectoryMetadata), aBodyDir, aHandleFileFunc,
+                           aCanRemoveFiles, aTrackQuota);
+}
+
+nsresult CreateMarkerFile(const CacheDirectoryMetadata& aDirectoryMetadata);
+
+nsresult DeleteMarkerFile(const CacheDirectoryMetadata& aDirectoryMetadata);
+
+bool MarkerFileExists(const CacheDirectoryMetadata& aDirectoryMetadata);
+
+nsresult RemoveNsIFileRecursively(
+    const Maybe<CacheDirectoryMetadata>& aDirectoryMetadata, nsIFile& aFile,
+    bool aTrackQuota = true);
+
+// XXX Remove this method when all callers properly wrap aClientMetadata with
+// Some/Nothing
+inline nsresult RemoveNsIFileRecursively(
+    const CacheDirectoryMetadata& aDirectoryMetadata, nsIFile& aFile,
+    bool aTrackQuota = true) {
+  return RemoveNsIFileRecursively(Some(aDirectoryMetadata), aFile, aTrackQuota);
+}
+
+// Delete a file that you think exists. If the file doesn't exist, an error
+// will not be returned, but warning telemetry will be generated! So only call
+// this on files that you know exist (idempotent usage, but it's not
+// recommended).
+nsresult RemoveNsIFile(const Maybe<CacheDirectoryMetadata>& aDirectoryMetadata,
+                       nsIFile& aFile, bool aTrackQuota = true);
+
+// XXX Remove this method when all callers properly wrap aClientMetadata with
+// Some/Nothing
+inline nsresult RemoveNsIFile(const CacheDirectoryMetadata& aDirectoryMetadata,
+                              nsIFile& aFile, bool aTrackQuota = true) {
+  return RemoveNsIFile(Some(aDirectoryMetadata), aFile, aTrackQuota);
+}
+
+void DecreaseUsageForDirectoryMetadata(
+    const CacheDirectoryMetadata& aDirectoryMetadata, int64_t aUpdatingSize);
+
+/**
+ * This function is used to check if the directory padding file is existed.
+ */
+bool DirectoryPaddingFileExists(nsIFile& aBaseDir,
+                                DirPaddingFile aPaddingFileType);
+
+/**
+ *
+ * The functions below are used to read/write/delete the directory padding file
+ * after acquiring the mutex lock. The mutex lock is held by
+ * CacheQuotaClient to prevent multi-thread accessing issue. To avoid deadlock,
+ * these functions should only access by static functions in
+ * dom/cache/QuotaClient.cpp.
+ *
+ */
+
+// Returns a Result with a success value denoting the padding size.
+Result<int64_t, nsresult> DirectoryPaddingGet(nsIFile& aBaseDir);
+
+nsresult DirectoryPaddingInit(nsIFile& aBaseDir);
+
+nsresult UpdateDirectoryPaddingFile(nsIFile& aBaseDir,
+                                    mozIStorageConnection& aConn,
+                                    int64_t aIncreaseSize,
+                                    int64_t aDecreaseSize,
+                                    bool aTemporaryFileExist);
+
+nsresult DirectoryPaddingFinalizeWrite(nsIFile& aBaseDir);
+
+// Returns a Result with a success value denoting the padding size.
+Result<int64_t, nsresult> DirectoryPaddingRestore(nsIFile& aBaseDir,
+                                                  mozIStorageConnection& aConn,
+                                                  bool aMustRestore);
+
+nsresult DirectoryPaddingDeleteFile(nsIFile& aBaseDir,
+                                    DirPaddingFile aPaddingFileType);
+}  // namespace mozilla::dom::cache
+
+#endif  // mozilla_dom_cache_FileUtils_h