From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- modules/libjar/nsJAR.cpp | 885 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 885 insertions(+) create mode 100644 modules/libjar/nsJAR.cpp (limited to 'modules/libjar/nsJAR.cpp') 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 +#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 +#elif defined(XP_WIN) +# include +#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 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 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 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 zipFile; + rv = aZipReader->GetFile(getter_AddRefs(zipFile)); + NS_ENSURE_SUCCESS(rv, rv); + + RefPtr 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 handle; + { + nsJAR* outerJAR = static_cast(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 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 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 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 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 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 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 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 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 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& 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 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 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; +} + +//////////////////////////////////////////////////////////////////////////////// -- cgit v1.2.3