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-rw-r--r--startupcache/StartupCacheUtils.cpp253
1 files changed, 253 insertions, 0 deletions
diff --git a/startupcache/StartupCacheUtils.cpp b/startupcache/StartupCacheUtils.cpp
new file mode 100644
index 000000000..19a6b4e1b
--- /dev/null
+++ b/startupcache/StartupCacheUtils.cpp
@@ -0,0 +1,253 @@
+/* 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/. */
+
+#include "nsCOMPtr.h"
+#include "nsIInputStream.h"
+#include "nsIStringStream.h"
+#include "nsNetUtil.h"
+#include "nsIFileURL.h"
+#include "nsIJARURI.h"
+#include "nsIResProtocolHandler.h"
+#include "nsIChromeRegistry.h"
+#include "nsAutoPtr.h"
+#include "StartupCacheUtils.h"
+#include "mozilla/scache/StartupCache.h"
+#include "mozilla/Omnijar.h"
+
+namespace mozilla {
+namespace scache {
+
+NS_EXPORT nsresult
+NewObjectInputStreamFromBuffer(UniquePtr<char[]> buffer, uint32_t len,
+ nsIObjectInputStream** stream)
+{
+ nsCOMPtr<nsIStringInputStream> stringStream =
+ do_CreateInstance("@mozilla.org/io/string-input-stream;1");
+ NS_ENSURE_TRUE(stringStream, NS_ERROR_FAILURE);
+
+ nsCOMPtr<nsIObjectInputStream> objectInput =
+ do_CreateInstance("@mozilla.org/binaryinputstream;1");
+ NS_ENSURE_TRUE(objectInput, NS_ERROR_FAILURE);
+
+ stringStream->AdoptData(buffer.release(), len);
+ objectInput->SetInputStream(stringStream);
+
+ objectInput.forget(stream);
+ return NS_OK;
+}
+
+NS_EXPORT nsresult
+NewObjectOutputWrappedStorageStream(nsIObjectOutputStream **wrapperStream,
+ nsIStorageStream** stream,
+ bool wantDebugStream)
+{
+ nsCOMPtr<nsIStorageStream> storageStream;
+
+ nsresult rv = NS_NewStorageStream(256, UINT32_MAX, getter_AddRefs(storageStream));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIObjectOutputStream> objectOutput
+ = do_CreateInstance("@mozilla.org/binaryoutputstream;1");
+ nsCOMPtr<nsIOutputStream> outputStream
+ = do_QueryInterface(storageStream);
+
+ objectOutput->SetOutputStream(outputStream);
+
+#ifdef DEBUG
+ if (wantDebugStream) {
+ // Wrap in debug stream to detect unsupported writes of
+ // multiply-referenced non-singleton objects
+ StartupCache* sc = StartupCache::GetSingleton();
+ NS_ENSURE_TRUE(sc, NS_ERROR_UNEXPECTED);
+ nsCOMPtr<nsIObjectOutputStream> debugStream;
+ sc->GetDebugObjectOutputStream(objectOutput, getter_AddRefs(debugStream));
+ debugStream.forget(wrapperStream);
+ } else {
+ objectOutput.forget(wrapperStream);
+ }
+#else
+ objectOutput.forget(wrapperStream);
+#endif
+
+ storageStream.forget(stream);
+ return NS_OK;
+}
+
+NS_EXPORT nsresult
+NewBufferFromStorageStream(nsIStorageStream *storageStream,
+ UniquePtr<char[]>* buffer, uint32_t* len)
+{
+ nsresult rv;
+ nsCOMPtr<nsIInputStream> inputStream;
+ rv = storageStream->NewInputStream(0, getter_AddRefs(inputStream));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ uint64_t avail64;
+ rv = inputStream->Available(&avail64);
+ NS_ENSURE_SUCCESS(rv, rv);
+ NS_ENSURE_TRUE(avail64 <= UINT32_MAX, NS_ERROR_FILE_TOO_BIG);
+
+ uint32_t avail = (uint32_t)avail64;
+ auto temp = MakeUnique<char[]>(avail);
+ uint32_t read;
+ rv = inputStream->Read(temp.get(), avail, &read);
+ if (NS_SUCCEEDED(rv) && avail != read)
+ rv = NS_ERROR_UNEXPECTED;
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ *len = avail;
+ *buffer = Move(temp);
+ return NS_OK;
+}
+
+static const char baseName[2][5] = { "gre/", "app/" };
+
+static inline bool
+canonicalizeBase(nsAutoCString &spec,
+ nsACString &out)
+{
+ nsAutoCString greBase, appBase;
+ nsresult rv = mozilla::Omnijar::GetURIString(mozilla::Omnijar::GRE, greBase);
+ if (NS_FAILED(rv) || !greBase.Length())
+ return false;
+
+ rv = mozilla::Omnijar::GetURIString(mozilla::Omnijar::APP, appBase);
+ if (NS_FAILED(rv))
+ return false;
+
+ bool underGre = !greBase.Compare(spec.get(), false, greBase.Length());
+ bool underApp = appBase.Length() &&
+ !appBase.Compare(spec.get(), false, appBase.Length());
+
+ if (!underGre && !underApp)
+ return false;
+
+ /**
+ * At this point, if both underGre and underApp are true, it can be one
+ * of the two following cases:
+ * - the GRE directory points to a subdirectory of the APP directory,
+ * meaning spec points under GRE.
+ * - the APP directory points to a subdirectory of the GRE directory,
+ * meaning spec points under APP.
+ * Checking the GRE and APP path length is enough to know in which case
+ * we are.
+ */
+ if (underGre && underApp && greBase.Length() < appBase.Length())
+ underGre = false;
+
+ out.AppendLiteral("/resource/");
+ out.Append(baseName[underGre ? mozilla::Omnijar::GRE : mozilla::Omnijar::APP]);
+ out.Append(Substring(spec, underGre ? greBase.Length() : appBase.Length()));
+ return true;
+}
+
+/**
+ * PathifyURI transforms uris into useful zip paths
+ * to make it easier to manipulate startup cache entries
+ * using standard zip tools.
+ * Transformations applied:
+ * * resource:// URIs are resolved to their corresponding file/jar URI to
+ * canonicalize resources URIs other than gre and app.
+ * * Paths under GRE or APP directory have their base path replaced with
+ * resource/gre or resource/app to avoid depending on install location.
+ * * jar:file:///path/to/file.jar!/sub/path urls are replaced with
+ * /path/to/file.jar/sub/path
+ *
+ * The result is appended to the string passed in. Adding a prefix before
+ * calling is recommended to avoid colliding with other cache users.
+ *
+ * For example, in the js loader (string is prefixed with jsloader by caller):
+ * resource://gre/modules/XPCOMUtils.jsm or
+ * file://$GRE_DIR/modules/XPCOMUtils.jsm or
+ * jar:file://$GRE_DIR/omni.jar!/modules/XPCOMUtils.jsm becomes
+ * jsloader/resource/gre/modules/XPCOMUtils.jsm
+ * file://$PROFILE_DIR/extensions/{uuid}/components/component.js becomes
+ * jsloader/$PROFILE_DIR/extensions/%7Buuid%7D/components/component.js
+ * jar:file://$PROFILE_DIR/extensions/some.xpi!/components/component.js becomes
+ * jsloader/$PROFILE_DIR/extensions/some.xpi/components/component.js
+ */
+NS_EXPORT nsresult
+PathifyURI(nsIURI *in, nsACString &out)
+{
+ bool equals;
+ nsresult rv;
+ nsCOMPtr<nsIURI> uri = in;
+ nsAutoCString spec;
+
+ // Resolve resource:// URIs. At the end of this if/else block, we
+ // have both spec and uri variables identifying the same URI.
+ if (NS_SUCCEEDED(in->SchemeIs("resource", &equals)) && equals) {
+ nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIProtocolHandler> ph;
+ rv = ioService->GetProtocolHandler("resource", getter_AddRefs(ph));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIResProtocolHandler> irph(do_QueryInterface(ph, &rv));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = irph->ResolveURI(in, spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = ioService->NewURI(spec, nullptr, nullptr, getter_AddRefs(uri));
+ NS_ENSURE_SUCCESS(rv, rv);
+ } else {
+ if (NS_SUCCEEDED(in->SchemeIs("chrome", &equals)) && equals) {
+ nsCOMPtr<nsIChromeRegistry> chromeReg =
+ mozilla::services::GetChromeRegistryService();
+ if (!chromeReg)
+ return NS_ERROR_UNEXPECTED;
+
+ rv = chromeReg->ConvertChromeURL(in, getter_AddRefs(uri));
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ rv = uri->GetSpec(spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ if (!canonicalizeBase(spec, out)) {
+ if (NS_SUCCEEDED(uri->SchemeIs("file", &equals)) && equals) {
+ nsCOMPtr<nsIFileURL> baseFileURL;
+ baseFileURL = do_QueryInterface(uri, &rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsAutoCString path;
+ rv = baseFileURL->GetPath(path);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ out.Append(path);
+ } else if (NS_SUCCEEDED(uri->SchemeIs("jar", &equals)) && equals) {
+ nsCOMPtr<nsIJARURI> jarURI = do_QueryInterface(uri, &rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsCOMPtr<nsIURI> jarFileURI;
+ rv = jarURI->GetJARFile(getter_AddRefs(jarFileURI));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = PathifyURI(jarFileURI, out);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsAutoCString path;
+ rv = jarURI->GetJAREntry(path);
+ NS_ENSURE_SUCCESS(rv, rv);
+ out.Append('/');
+ out.Append(path);
+ } else { // Very unlikely
+ rv = uri->GetSpec(spec);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ out.Append('/');
+ out.Append(spec);
+ }
+ }
+ return NS_OK;
+}
+
+} // namespace scache
+} // namespace mozilla
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