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StartupCacheUtils.cpp
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/* 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 "nsNetUtil.h"
#include "nsIFileURL.h"
#include "nsIJARURI.h"
#include "nsISubstitutingProtocolHandler.h"
#include "nsIChromeRegistry.h"
#include "nsStringStream.h"
#include "StartupCacheUtils.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/Omnijar.h"
namespace mozilla {
namespace scache {
nsresult NewObjectInputStreamFromBuffer(const char* buffer, uint32_t len,
nsIObjectInputStream** stream) {
nsCOMPtr<nsIInputStream> stringStream;
nsresult rv = NS_NewByteInputStream(getter_AddRefs(stringStream),
Span(buffer, len), NS_ASSIGNMENT_DEPEND);
MOZ_ALWAYS_SUCCEEDS(rv);
nsCOMPtr<nsIObjectInputStream> objectInput =
NS_NewObjectInputStream(stringStream);
objectInput.forget(stream);
return NS_OK;
}
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<nsIOutputStream> outputStream = do_QueryInterface(storageStream);
nsCOMPtr<nsIObjectOutputStream> objectOutput =
NS_NewObjectOutputStream(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;
}
nsresult NewBufferFromStorageStream(nsIStorageStream* storageStream,
UniqueFreePtr<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 = UniqueFreePtr<char[]>(
reinterpret_cast<char*>(malloc(sizeof(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 = std::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 = StringBeginsWith(spec, greBase);
bool underApp = appBase.Length() && StringBeginsWith(spec, appBase);
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;
}
/**
* ResolveURI transforms a chrome: or resource: URI into the URI for its
* underlying resource, or returns any other URI unchanged.
*/
nsresult ResolveURI(nsIURI* in, nsIURI** out) {
nsresult rv;
nsAutoCString scheme;
in->GetScheme(scheme);
// Resolve resource:// URIs. At the end of this if/else block, we
// have both spec and uri variables identifying the same URI.
if (scheme.EqualsLiteral("resource") || scheme.EqualsLiteral("moz-src")) {
nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIProtocolHandler> ph;
rv = ioService->GetProtocolHandler(scheme.get(), getter_AddRefs(ph));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISubstitutingProtocolHandler> irph(do_QueryInterface(ph, &rv));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString spec;
rv = irph->ResolveURI(in, spec);
NS_ENSURE_SUCCESS(rv, rv);
return ioService->NewURI(spec, nullptr, nullptr, out);
}
if (scheme.EqualsLiteral("chrome")) {
nsCOMPtr<nsIChromeRegistry> chromeReg =
mozilla::services::GetChromeRegistry();
if (!chromeReg) return NS_ERROR_UNEXPECTED;
return chromeReg->ConvertChromeURL(in, out);
}
*out = do_AddRef(in).take();
return NS_OK;
}
static nsresult PathifyURIImpl(nsIURI* in, nsACString& out) {
nsCOMPtr<nsIURI> uri;
nsresult rv = ResolveURI(in, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString spec;
rv = uri->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
if (!canonicalizeBase(spec, out)) {
if (uri->SchemeIs("file")) {
nsCOMPtr<nsIFileURL> baseFileURL;
baseFileURL = do_QueryInterface(uri, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString path;
rv = baseFileURL->GetPathQueryRef(path);
NS_ENSURE_SUCCESS(rv, rv);
out.Append(path);
} else if (uri->SchemeIs("jar")) {
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 = PathifyURIImpl(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;
}
nsresult PathifyURI(const char* loaderType, size_t loaderTypeLength, nsIURI* in,
nsACString& out) {
out.AssignASCII(loaderType, loaderTypeLength);
return PathifyURIImpl(in, out);
}
} // namespace scache
} // namespace mozilla