startupcache/StartupCacheUtils.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5 #ifndef nsStartupCacheUtils_h_
   6 #define nsStartupCacheUtils_h_
   7
   8 #include "nsString.h"
   9 #include "nsIStorageStream.h"
  10 #include "nsIObjectInputStream.h"
  11 #include "nsIObjectOutputStream.h"
  12 #include "mozilla/UniquePtr.h"
  13
  14 class nsIURI;
  15
  16 namespace mozilla {
  17 namespace scache {
  18
  19 nsresult NewObjectInputStreamFromBuffer(const char* buffer, uint32_t len,
  20                                         nsIObjectInputStream** stream);
  21
  22 // We can't retrieve the wrapped stream from the objectOutputStream later,
  23 // so we return it here. We give callers in debug builds the option
  24 // to wrap the outputstream in a debug stream, which will detect if
  25 // non-singleton objects are written out multiple times during a serialization.
  26 // This could cause them to be deserialized incorrectly (as multiple copies
  27 // instead of references).
  28 nsresult NewObjectOutputWrappedStorageStream(
  29     nsIObjectOutputStream** wrapperStream, nsIStorageStream** stream,
  30     bool wantDebugStream);
  31
  32 // Creates a buffer for storing the stream into the cache. The buffer is
  33 // allocated with 'new []'.  After calling this function, the caller would
  34 // typically call StartupCache::PutBuffer with the returned buffer.
  35 nsresult NewBufferFromStorageStream(nsIStorageStream* storageStream,
  36                                     UniquePtr<char[]>* buffer, uint32_t* len);
  37
  38 nsresult ResolveURI(nsIURI* in, nsIURI** out);
  39
  40 // PathifyURI transforms uris into useful zip paths
  41 // to make it easier to manipulate startup cache entries
  42 // using standard zip tools.
  43 //
  44 // Transformations applied:
  45 //  * resource:// URIs are resolved to their corresponding file/jar URI to
  46 //    canonicalize resources URIs other than gre and app.
  47 //  * Paths under GRE or APP directory have their base path replaced with
  48 //    resource/gre or resource/app to avoid depending on install location.
  49 //  * jar:file:///path/to/file.jar!/sub/path urls are replaced with
  50 //    /path/to/file.jar/sub/path
  51 //
  52 // The result is concatenated with loaderType and stored into the string
  53 // passed in.
  54 //
  55 // For example, in the js loader (loaderType = "jsloader"):
  56 //  resource://gre/modules/XPCOMUtils.jsm or
  57 //  file://$GRE_DIR/modules/XPCOMUtils.jsm or
  58 //  jar:file://$GRE_DIR/omni.jar!/modules/XPCOMUtils.jsm becomes
  59 //     jsloader/resource/gre/modules/XPCOMUtils.jsm
  60 //  file://$PROFILE_DIR/extensions/{uuid}/components/component.js becomes
  61 //     jsloader/$PROFILE_DIR/extensions/%7Buuid%7D/components/component.js
  62 //  jar:file://$PROFILE_DIR/extensions/some.xpi!/components/component.js becomes
  63 //     jsloader/$PROFILE_DIR/extensions/some.xpi/components/component.js
  64 nsresult PathifyURI(const char* loaderType, size_t loaderTypeLength, nsIURI* in,
  65                     nsACString& out);
  66
  67 template <int N>
  68 nsresult PathifyURI(const char (&loaderType)[N], nsIURI* in, nsACString& out) {
  69   return PathifyURI(loaderType, N - 1, in, out);
  70 }
  71
  72 }  // namespace scache
  73 }  // namespace mozilla
  74
  75 #endif  // nsStartupCacheUtils_h_