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-rw-r--r--modules/libjar/nsJAR.cpp885
1 files changed, 885 insertions, 0 deletions
diff --git a/modules/libjar/nsJAR.cpp b/modules/libjar/nsJAR.cpp
new file mode 100644
index 0000000000..e61066c69d
--- /dev/null
+++ b/modules/libjar/nsJAR.cpp
@@ -0,0 +1,885 @@
+/* -*- 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/. */
+#include <string.h>
+#include "nsJARInputStream.h"
+#include "nsJAR.h"
+#include "nsIFile.h"
+#include "nsIObserverService.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Omnijar.h"
+#include "mozilla/Unused.h"
+
+#ifdef XP_UNIX
+# include <sys/stat.h>
+#elif defined(XP_WIN)
+# include <io.h>
+#endif
+
+using namespace mozilla;
+
+static LazyLogModule gJarLog("nsJAR");
+
+#ifdef LOG
+# undef LOG
+#endif
+#ifdef LOG_ENABLED
+# undef LOG_ENABLED
+#endif
+
+#define LOG(args) MOZ_LOG(gJarLog, mozilla::LogLevel::Debug, args)
+#define LOG_ENABLED() MOZ_LOG_TEST(gJarLog, mozilla::LogLevel::Debug)
+
+//----------------------------------------------
+// nsJAR constructor/destructor
+//----------------------------------------------
+
+// The following initialization makes a guess of 10 entries per jarfile.
+nsJAR::nsJAR()
+ : mReleaseTime(PR_INTERVAL_NO_TIMEOUT),
+ mLock("nsJAR::mLock"),
+ mCache(nullptr) {}
+
+nsJAR::~nsJAR() { Close(); }
+
+NS_IMPL_QUERY_INTERFACE(nsJAR, nsIZipReader)
+NS_IMPL_ADDREF(nsJAR)
+
+// Custom Release method works with nsZipReaderCache...
+// Release might be called from multi-thread, we have to
+// take this function carefully to avoid delete-after-use.
+MozExternalRefCountType nsJAR::Release(void) {
+ nsrefcnt count;
+ MOZ_ASSERT(0 != mRefCnt, "dup release");
+
+ RefPtr<nsZipReaderCache> cache;
+ if (mRefCnt == 2) { // don't use a lock too frequently
+ // Use a mutex here to guarantee mCache is not racing and the target
+ // instance is still valid to increase ref-count.
+ RecursiveMutexAutoLock lock(mLock);
+ cache = mCache;
+ mCache = nullptr;
+ }
+ if (cache) {
+ DebugOnly<nsresult> rv = cache->ReleaseZip(this);
+ MOZ_ASSERT(NS_SUCCEEDED(rv), "failed to release zip file");
+ }
+
+ count = --mRefCnt; // don't access any member variable after this line
+ NS_LOG_RELEASE(this, count, "nsJAR");
+ if (0 == count) {
+ mRefCnt = 1; /* stabilize */
+ /* enable this to find non-threadsafe destructors: */
+ /* NS_ASSERT_OWNINGTHREAD(nsJAR); */
+ delete this;
+ return 0;
+ }
+
+ return count;
+}
+
+//----------------------------------------------
+// nsIZipReader implementation
+//----------------------------------------------
+
+NS_IMETHODIMP
+nsJAR::Open(nsIFile* zipFile) {
+ NS_ENSURE_ARG_POINTER(zipFile);
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("Open[%p] %s", this, zipFile->HumanReadablePath().get()));
+ if (mZip) return NS_ERROR_FAILURE; // Already open!
+
+ mZipFile = zipFile;
+ mOuterZipEntry.Truncate();
+
+ // The omnijar is special, it is opened early on and closed late
+ RefPtr<nsZipArchive> zip = mozilla::Omnijar::GetReader(zipFile);
+ if (!zip) {
+ zip = nsZipArchive::OpenArchive(zipFile);
+ }
+ mZip = zip;
+ return mZip ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJAR::OpenInner(nsIZipReader* aZipReader, const nsACString& aZipEntry) {
+ nsresult rv;
+
+ LOG(("OpenInner[%p] %s", this, PromiseFlatCString(aZipEntry).get()));
+ NS_ENSURE_ARG_POINTER(aZipReader);
+
+ nsCOMPtr<nsIFile> zipFile;
+ rv = aZipReader->GetFile(getter_AddRefs(zipFile));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ RefPtr<nsZipArchive> innerZip =
+ mozilla::Omnijar::GetInnerReader(zipFile, aZipEntry);
+ if (innerZip) {
+ RecursiveMutexAutoLock lock(mLock);
+ if (mZip) {
+ return NS_ERROR_FAILURE;
+ }
+ mZip = innerZip;
+ return NS_OK;
+ }
+
+ bool exist;
+ rv = aZipReader->HasEntry(aZipEntry, &exist);
+ NS_ENSURE_SUCCESS(rv, rv);
+ NS_ENSURE_TRUE(exist, NS_ERROR_FILE_NOT_FOUND);
+
+ RefPtr<nsZipHandle> handle;
+ {
+ nsJAR* outerJAR = static_cast<nsJAR*>(aZipReader);
+ RecursiveMutexAutoLock outerLock(outerJAR->mLock);
+ rv = nsZipHandle::Init(outerJAR->mZip.get(),
+ PromiseFlatCString(aZipEntry).get(),
+ getter_AddRefs(handle));
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ RecursiveMutexAutoLock lock(mLock);
+ MOZ_ASSERT(!mZip, "Another thread tried to open this nsJAR racily!");
+ mZipFile = zipFile.forget();
+ mOuterZipEntry.Assign(aZipEntry);
+ mZip = nsZipArchive::OpenArchive(handle);
+ return mZip ? NS_OK : NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsJAR::GetFile(nsIFile** result) {
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("GetFile[%p]", this));
+ *result = mZipFile;
+ NS_IF_ADDREF(*result);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::Close() {
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("Close[%p]", this));
+ if (!mZip) {
+ return NS_ERROR_FAILURE; // Never opened or already closed.
+ }
+
+ mZip = nullptr;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::Test(const nsACString& aEntryName) {
+ RecursiveMutexAutoLock lock(mLock);
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+ return mZip->Test(
+ aEntryName.IsEmpty() ? nullptr : PromiseFlatCString(aEntryName).get());
+}
+
+NS_IMETHODIMP
+nsJAR::Extract(const nsACString& aEntryName, nsIFile* outFile) {
+ // nsZipArchive and zlib are not thread safe
+ // we need to use a lock to prevent bug #51267
+ RecursiveMutexAutoLock lock(mLock);
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+
+ LOG(("Extract[%p] %s", this, PromiseFlatCString(aEntryName).get()));
+ nsZipItem* item = mZip->GetItem(PromiseFlatCString(aEntryName).get());
+ NS_ENSURE_TRUE(item, NS_ERROR_FILE_NOT_FOUND);
+
+ // Remove existing file or directory so we set permissions correctly.
+ // If it's a directory that already exists and contains files, throw
+ // an exception and return.
+
+ nsresult rv = outFile->Remove(false);
+ if (rv == NS_ERROR_FILE_DIR_NOT_EMPTY || rv == NS_ERROR_FAILURE) return rv;
+
+ if (item->IsDirectory()) {
+ rv = outFile->Create(nsIFile::DIRECTORY_TYPE, item->Mode());
+ // XXX Do this in nsZipArchive? It would be nice to keep extraction
+ // XXX code completely there, but that would require a way to get a
+ // XXX PRDir from outFile.
+ } else {
+ PRFileDesc* fd;
+ rv = outFile->OpenNSPRFileDesc(PR_WRONLY | PR_CREATE_FILE, item->Mode(),
+ &fd);
+ if (NS_FAILED(rv)) return rv;
+
+ // ExtractFile also closes the fd handle and resolves the symlink if needed
+ rv = mZip->ExtractFile(item, outFile, fd);
+ }
+ if (NS_FAILED(rv)) return rv;
+
+ // nsIFile needs milliseconds, while prtime is in microseconds.
+ // non-fatal if this fails, ignore errors
+ outFile->SetLastModifiedTime(item->LastModTime() / PR_USEC_PER_MSEC);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::GetEntry(const nsACString& aEntryName, nsIZipEntry** result) {
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("GetEntry[%p] %s", this, PromiseFlatCString(aEntryName).get()));
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+ nsZipItem* zipItem = mZip->GetItem(PromiseFlatCString(aEntryName).get());
+ NS_ENSURE_TRUE(zipItem, NS_ERROR_FILE_NOT_FOUND);
+
+ nsJARItem* jarItem = new nsJARItem(zipItem);
+
+ NS_ADDREF(*result = jarItem);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::HasEntry(const nsACString& aEntryName, bool* result) {
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("HasEntry[%p] %s", this, PromiseFlatCString(aEntryName).get()));
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+ *result = mZip->GetItem(PromiseFlatCString(aEntryName).get()) != nullptr;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::FindEntries(const nsACString& aPattern,
+ nsIUTF8StringEnumerator** result) {
+ NS_ENSURE_ARG_POINTER(result);
+ RecursiveMutexAutoLock lock(mLock);
+ LOG(("FindEntries[%p] %s", this, PromiseFlatCString(aPattern).get()));
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsZipFind* find;
+ nsresult rv = mZip->FindInit(
+ aPattern.IsEmpty() ? nullptr : PromiseFlatCString(aPattern).get(), &find);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ nsIUTF8StringEnumerator* zipEnum = new nsJAREnumerator(find);
+
+ NS_ADDREF(*result = zipEnum);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsJAR::GetInputStream(const nsACString& aFilename, nsIInputStream** result) {
+ return GetInputStreamWithSpec(""_ns, aFilename, result);
+}
+
+NS_IMETHODIMP
+nsJAR::GetInputStreamWithSpec(const nsACString& aJarDirSpec,
+ const nsACString& aEntryName,
+ nsIInputStream** result) {
+ NS_ENSURE_ARG_POINTER(result);
+ RecursiveMutexAutoLock lock(mLock);
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+
+ LOG(("GetInputStreamWithSpec[%p] %s %s", this,
+ PromiseFlatCString(aJarDirSpec).get(),
+ PromiseFlatCString(aEntryName).get()));
+ // Watch out for the jar:foo.zip!/ (aDir is empty) top-level special case!
+ nsZipItem* item = nullptr;
+ const nsCString& entry = PromiseFlatCString(aEntryName);
+ if (*entry.get()) {
+ // First check if item exists in jar
+ item = mZip->GetItem(entry.get());
+ if (!item) return NS_ERROR_FILE_NOT_FOUND;
+ }
+ nsJARInputStream* jis = new nsJARInputStream();
+ // addref now so we can call InitFile/InitDirectory()
+ NS_ADDREF(*result = jis);
+
+ nsresult rv = NS_OK;
+ if (!item || item->IsDirectory()) {
+ rv = jis->InitDirectory(this, aJarDirSpec, entry.get());
+ } else {
+ RefPtr<nsZipHandle> fd = mZip->GetFD();
+ rv = jis->InitFile(fd, mZip->GetData(item), item);
+ }
+ if (NS_FAILED(rv)) {
+ NS_RELEASE(*result);
+ }
+ return rv;
+}
+
+nsresult nsJAR::GetFullJarPath(nsACString& aResult) {
+ RecursiveMutexAutoLock lock(mLock);
+ NS_ENSURE_ARG_POINTER(mZipFile);
+
+ nsresult rv = mZipFile->GetPersistentDescriptor(aResult);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ if (mOuterZipEntry.IsEmpty()) {
+ aResult.InsertLiteral("file:", 0);
+ } else {
+ aResult.InsertLiteral("jar:", 0);
+ aResult.AppendLiteral("!/");
+ aResult.Append(mOuterZipEntry);
+ }
+ return NS_OK;
+}
+
+nsresult nsJAR::GetNSPRFileDesc(PRFileDesc** aNSPRFileDesc) {
+ RecursiveMutexAutoLock lock(mLock);
+ if (!aNSPRFileDesc) {
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+ *aNSPRFileDesc = nullptr;
+
+ if (!mZip) {
+ return NS_ERROR_FAILURE;
+ }
+
+ RefPtr<nsZipHandle> handle = mZip->GetFD();
+ if (!handle) {
+ return NS_ERROR_FAILURE;
+ }
+
+ return handle->GetNSPRFileDesc(aNSPRFileDesc);
+}
+
+//----------------------------------------------
+// nsJAR private implementation
+//----------------------------------------------
+nsresult nsJAR::LoadEntry(const nsACString& aFilename, nsCString& aBuf) {
+ //-- Get a stream for reading the file
+ nsresult rv;
+ nsCOMPtr<nsIInputStream> manifestStream;
+ rv = GetInputStream(aFilename, getter_AddRefs(manifestStream));
+ if (NS_FAILED(rv)) return NS_ERROR_FILE_NOT_FOUND;
+
+ //-- Read the manifest file into memory
+ char* buf;
+ uint64_t len64;
+ rv = manifestStream->Available(&len64);
+ if (NS_FAILED(rv)) return rv;
+ NS_ENSURE_TRUE(len64 < UINT32_MAX, NS_ERROR_FILE_CORRUPTED); // bug 164695
+ uint32_t len = (uint32_t)len64;
+ buf = (char*)malloc(len + 1);
+ if (!buf) return NS_ERROR_OUT_OF_MEMORY;
+ uint32_t bytesRead;
+ rv = manifestStream->Read(buf, len, &bytesRead);
+ if (bytesRead != len) {
+ rv = NS_ERROR_FILE_CORRUPTED;
+ }
+ if (NS_FAILED(rv)) {
+ free(buf);
+ return rv;
+ }
+ buf[len] = '\0'; // Null-terminate the buffer
+ aBuf.Adopt(buf, len);
+ return NS_OK;
+}
+
+int32_t nsJAR::ReadLine(const char** src) {
+ if (!*src) {
+ return 0;
+ }
+
+ //--Moves pointer to beginning of next line and returns line length
+ // not including CR/LF.
+ int32_t length;
+ const char* eol = strpbrk(*src, "\r\n");
+
+ if (eol == nullptr) // Probably reached end of file before newline
+ {
+ length = strlen(*src);
+ if (length == 0) // immediate end-of-file
+ *src = nullptr;
+ else // some data left on this line
+ *src += length;
+ } else {
+ length = eol - *src;
+ if (eol[0] == '\r' && eol[1] == '\n') // CR LF, so skip 2
+ *src = eol + 2;
+ else // Either CR or LF, so skip 1
+ *src = eol + 1;
+ }
+ return length;
+}
+
+NS_IMPL_ISUPPORTS(nsJAREnumerator, nsIUTF8StringEnumerator, nsIStringEnumerator)
+
+//----------------------------------------------
+// nsJAREnumerator::HasMore
+//----------------------------------------------
+NS_IMETHODIMP
+nsJAREnumerator::HasMore(bool* aResult) {
+ // try to get the next element
+ if (!mName) {
+ NS_ASSERTION(mFind, "nsJAREnumerator: Missing zipFind.");
+ nsresult rv = mFind->FindNext(&mName, &mNameLen);
+ if (rv == NS_ERROR_FILE_NOT_FOUND) {
+ *aResult = false; // No more matches available
+ return NS_OK;
+ }
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE); // no error translation
+ }
+
+ *aResult = true;
+ return NS_OK;
+}
+
+//----------------------------------------------
+// nsJAREnumerator::GetNext
+//----------------------------------------------
+NS_IMETHODIMP
+nsJAREnumerator::GetNext(nsACString& aResult) {
+ // check if the current item is "stale"
+ if (!mName) {
+ bool bMore;
+ nsresult rv = HasMore(&bMore);
+ if (NS_FAILED(rv) || !bMore)
+ return NS_ERROR_FAILURE; // no error translation
+ }
+ aResult.Assign(mName, mNameLen);
+ mName = 0; // we just gave this one away
+ return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsJARItem, nsIZipEntry)
+
+nsJARItem::nsJARItem(nsZipItem* aZipItem)
+ : mSize(aZipItem->Size()),
+ mRealsize(aZipItem->RealSize()),
+ mCrc32(aZipItem->CRC32()),
+ mLastModTime(aZipItem->LastModTime()),
+ mCompression(aZipItem->Compression()),
+ mPermissions(aZipItem->Mode()),
+ mIsDirectory(aZipItem->IsDirectory()),
+ mIsSynthetic(aZipItem->isSynthetic) {}
+
+//------------------------------------------
+// nsJARItem::GetCompression
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetCompression(uint16_t* aCompression) {
+ NS_ENSURE_ARG_POINTER(aCompression);
+
+ *aCompression = mCompression;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetSize
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetSize(uint32_t* aSize) {
+ NS_ENSURE_ARG_POINTER(aSize);
+
+ *aSize = mSize;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetRealSize
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetRealSize(uint32_t* aRealsize) {
+ NS_ENSURE_ARG_POINTER(aRealsize);
+
+ *aRealsize = mRealsize;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetCrc32
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetCRC32(uint32_t* aCrc32) {
+ NS_ENSURE_ARG_POINTER(aCrc32);
+
+ *aCrc32 = mCrc32;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetIsDirectory
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetIsDirectory(bool* aIsDirectory) {
+ NS_ENSURE_ARG_POINTER(aIsDirectory);
+
+ *aIsDirectory = mIsDirectory;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetIsSynthetic
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetIsSynthetic(bool* aIsSynthetic) {
+ NS_ENSURE_ARG_POINTER(aIsSynthetic);
+
+ *aIsSynthetic = mIsSynthetic;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetLastModifiedTime
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetLastModifiedTime(PRTime* aLastModTime) {
+ NS_ENSURE_ARG_POINTER(aLastModTime);
+
+ *aLastModTime = mLastModTime;
+ return NS_OK;
+}
+
+//------------------------------------------
+// nsJARItem::GetPermissions
+//------------------------------------------
+NS_IMETHODIMP
+nsJARItem::GetPermissions(uint32_t* aPermissions) {
+ NS_ENSURE_ARG_POINTER(aPermissions);
+
+ *aPermissions = mPermissions;
+ return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIZipReaderCache
+
+NS_IMPL_ISUPPORTS(nsZipReaderCache, nsIZipReaderCache, nsIObserver,
+ nsISupportsWeakReference)
+
+nsZipReaderCache::nsZipReaderCache()
+ : mLock("nsZipReaderCache.mLock"),
+ mCacheSize(0),
+ mZips()
+#ifdef ZIP_CACHE_HIT_RATE
+ ,
+ mZipCacheLookups(0),
+ mZipCacheHits(0),
+ mZipCacheFlushes(0),
+ mZipSyncMisses(0)
+#endif
+{
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::Init(uint32_t cacheSize) {
+ MutexAutoLock lock(mLock);
+ mCacheSize = cacheSize;
+
+ // Register as a memory pressure observer
+ nsCOMPtr<nsIObserverService> os =
+ do_GetService("@mozilla.org/observer-service;1");
+ if (os) {
+ os->AddObserver(this, "memory-pressure", true);
+ os->AddObserver(this, "chrome-flush-caches", true);
+ os->AddObserver(this, "flush-cache-entry", true);
+ }
+ // ignore failure of the observer registration.
+
+ return NS_OK;
+}
+
+nsZipReaderCache::~nsZipReaderCache() {
+ for (const auto& zip : mZips.Values()) {
+ zip->SetZipReaderCache(nullptr);
+ }
+
+#ifdef ZIP_CACHE_HIT_RATE
+ printf(
+ "nsZipReaderCache size=%d hits=%d lookups=%d rate=%f%% flushes=%d missed "
+ "%d\n",
+ mCacheSize, mZipCacheHits, mZipCacheLookups,
+ (float)mZipCacheHits / mZipCacheLookups, mZipCacheFlushes,
+ mZipSyncMisses);
+#endif
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::IsCached(nsIFile* zipFile, bool* aResult) {
+ NS_ENSURE_ARG_POINTER(zipFile);
+ nsresult rv;
+ MutexAutoLock lock(mLock);
+
+ nsAutoCString uri;
+ rv = zipFile->GetPersistentDescriptor(uri);
+ if (NS_FAILED(rv)) return rv;
+
+ uri.InsertLiteral("file:", 0);
+
+ *aResult = mZips.Contains(uri);
+ return NS_OK;
+}
+
+nsresult nsZipReaderCache::GetZip(nsIFile* zipFile, nsIZipReader** result,
+ bool failOnMiss) {
+ NS_ENSURE_ARG_POINTER(zipFile);
+ nsresult rv;
+ MutexAutoLock lock(mLock);
+
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheLookups++;
+#endif
+
+ nsAutoCString uri;
+ rv = zipFile->GetPersistentDescriptor(uri);
+ if (NS_FAILED(rv)) return rv;
+
+ uri.InsertLiteral("file:", 0);
+
+ RefPtr<nsJAR> zip;
+ mZips.Get(uri, getter_AddRefs(zip));
+ if (zip) {
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheHits++;
+#endif
+ zip->ClearReleaseTime();
+ } else {
+ if (failOnMiss) {
+ return NS_ERROR_CACHE_KEY_NOT_FOUND;
+ }
+
+ zip = new nsJAR();
+ zip->SetZipReaderCache(this);
+ rv = zip->Open(zipFile);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ MOZ_ASSERT(!mZips.Contains(uri));
+ mZips.InsertOrUpdate(uri, RefPtr{zip});
+ }
+ zip.forget(result);
+ return rv;
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::GetZipIfCached(nsIFile* zipFile, nsIZipReader** result) {
+ return GetZip(zipFile, result, true);
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::GetZip(nsIFile* zipFile, nsIZipReader** result) {
+ return GetZip(zipFile, result, false);
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::GetInnerZip(nsIFile* zipFile, const nsACString& entry,
+ nsIZipReader** result) {
+ NS_ENSURE_ARG_POINTER(zipFile);
+
+ nsCOMPtr<nsIZipReader> outerZipReader;
+ nsresult rv = GetZip(zipFile, getter_AddRefs(outerZipReader));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ MutexAutoLock lock(mLock);
+
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheLookups++;
+#endif
+
+ nsAutoCString uri;
+ rv = zipFile->GetPersistentDescriptor(uri);
+ if (NS_FAILED(rv)) return rv;
+
+ uri.InsertLiteral("jar:", 0);
+ uri.AppendLiteral("!/");
+ uri.Append(entry);
+
+ RefPtr<nsJAR> zip;
+ mZips.Get(uri, getter_AddRefs(zip));
+ if (zip) {
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheHits++;
+#endif
+ zip->ClearReleaseTime();
+ } else {
+ zip = new nsJAR();
+ zip->SetZipReaderCache(this);
+
+ rv = zip->OpenInner(outerZipReader, entry);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ MOZ_ASSERT(!mZips.Contains(uri));
+ mZips.InsertOrUpdate(uri, RefPtr{zip});
+ }
+ zip.forget(result);
+ return rv;
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::GetFd(nsIFile* zipFile, PRFileDesc** aRetVal) {
+#if defined(XP_WIN)
+ MOZ_CRASH("Not implemented");
+ return NS_ERROR_NOT_IMPLEMENTED;
+#else
+ if (!zipFile) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsresult rv;
+ nsAutoCString uri;
+ rv = zipFile->GetPersistentDescriptor(uri);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ uri.InsertLiteral("file:", 0);
+
+ MutexAutoLock lock(mLock);
+ RefPtr<nsJAR> zip;
+ mZips.Get(uri, getter_AddRefs(zip));
+ if (!zip) {
+ return NS_ERROR_FAILURE;
+ }
+
+ zip->ClearReleaseTime();
+ rv = zip->GetNSPRFileDesc(aRetVal);
+ // Do this to avoid possible deadlock on mLock with ReleaseZip().
+ {
+ MutexAutoUnlock unlock(mLock);
+ zip = nullptr;
+ }
+ return rv;
+#endif /* XP_WIN */
+}
+
+nsresult nsZipReaderCache::ReleaseZip(nsJAR* zip) {
+ nsresult rv;
+ MutexAutoLock lock(mLock);
+
+ // It is possible that two thread compete for this zip. The dangerous
+ // case is where one thread Releases the zip and discovers that the ref
+ // count has gone to one. Before it can call this ReleaseZip method
+ // another thread calls our GetZip method. The ref count goes to two. That
+ // second thread then Releases the zip and the ref count goes to one. It
+ // then tries to enter this ReleaseZip method and blocks while the first
+ // thread is still here. The first thread continues and remove the zip from
+ // the cache and calls its Release method sending the ref count to 0 and
+ // deleting the zip. However, the second thread is still blocked at the
+ // start of ReleaseZip, but the 'zip' param now hold a reference to a
+ // deleted zip!
+ //
+ // So, we are going to try safeguarding here by searching our hashtable while
+ // locked here for the zip. We return fast if it is not found.
+
+ bool found = false;
+ for (const auto& current : mZips.Values()) {
+ if (zip == current) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipSyncMisses++;
+#endif
+ return NS_OK;
+ }
+
+ zip->SetReleaseTime();
+
+ if (mZips.Count() <= mCacheSize) return NS_OK;
+
+ // Find the oldest zip.
+ nsJAR* oldest = nullptr;
+ for (const auto& current : mZips.Values()) {
+ PRIntervalTime currentReleaseTime = current->GetReleaseTime();
+ if (currentReleaseTime != PR_INTERVAL_NO_TIMEOUT) {
+ if (oldest == nullptr || currentReleaseTime < oldest->GetReleaseTime()) {
+ oldest = current;
+ }
+ }
+ }
+
+ // Because of the craziness above it is possible that there is no zip that
+ // needs removing.
+ if (!oldest) return NS_OK;
+
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheFlushes++;
+#endif
+
+ // remove from hashtable
+ nsAutoCString uri;
+ rv = oldest->GetFullJarPath(uri);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // Retrieving and removing the JAR should be done without an extra AddRef
+ // and Release, or we'll trigger nsJAR::Release's magic refcount 1 case
+ // an extra time.
+ RefPtr<nsJAR> removed;
+ mZips.Remove(uri, getter_AddRefs(removed));
+ NS_ASSERTION(removed, "botched");
+ NS_ASSERTION(oldest == removed, "removed wrong entry");
+
+ if (removed) removed->SetZipReaderCache(nullptr);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsZipReaderCache::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aSomeData) {
+ if (strcmp(aTopic, "memory-pressure") == 0) {
+ MutexAutoLock lock(mLock);
+ for (auto iter = mZips.Iter(); !iter.Done(); iter.Next()) {
+ RefPtr<nsJAR>& current = iter.Data();
+ if (current->GetReleaseTime() != PR_INTERVAL_NO_TIMEOUT) {
+ current->SetZipReaderCache(nullptr);
+ iter.Remove();
+ }
+ }
+ } else if (strcmp(aTopic, "chrome-flush-caches") == 0) {
+ MutexAutoLock lock(mLock);
+ for (const auto& current : mZips.Values()) {
+ current->SetZipReaderCache(nullptr);
+ }
+ mZips.Clear();
+ } else if (strcmp(aTopic, "flush-cache-entry") == 0) {
+ nsCOMPtr<nsIFile> file;
+ if (aSubject) {
+ file = do_QueryInterface(aSubject);
+ } else if (aSomeData) {
+ nsDependentString fileName(aSomeData);
+ Unused << NS_NewLocalFile(fileName, false, getter_AddRefs(file));
+ }
+
+ if (!file) return NS_OK;
+
+ nsAutoCString uri;
+ if (NS_FAILED(file->GetPersistentDescriptor(uri))) return NS_OK;
+
+ uri.InsertLiteral("file:", 0);
+
+ MutexAutoLock lock(mLock);
+
+ RefPtr<nsJAR> zip;
+ mZips.Get(uri, getter_AddRefs(zip));
+ if (!zip) return NS_OK;
+
+#ifdef ZIP_CACHE_HIT_RATE
+ mZipCacheFlushes++;
+#endif
+
+ zip->SetZipReaderCache(nullptr);
+
+ mZips.Remove(uri);
+ }
+ return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
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