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gecko/netwerk/cache/nsCacheEntryDescriptor.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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 "nsICache.h"
#include "nsCache.h"
#include "nsCacheService.h"
#include "nsCacheEntryDescriptor.h"
#include "nsCacheEntry.h"
#include "nsReadableUtils.h"
#include "nsIOutputStream.h"
#include "nsCRT.h"
#include "nsThreadUtils.h"
#include <algorithm>
#define kMinDecompressReadBufLen 1024
#define kMinCompressWriteBufLen 1024
/******************************************************************************
* nsAsyncDoomEvent
*****************************************************************************/
class nsAsyncDoomEvent : public nsRunnable {
public:
nsAsyncDoomEvent(nsCacheEntryDescriptor *descriptor,
nsICacheListener *listener)
{
mDescriptor = descriptor;
mListener = listener;
mThread = do_GetCurrentThread();
// We addref the listener here and release it in nsNotifyDoomListener
// on the callers thread. If posting of nsNotifyDoomListener event fails
// we leak the listener which is better than releasing it on a wrong
// thread.
NS_IF_ADDREF(mListener);
}
NS_IMETHOD Run()
{
nsresult status = NS_OK;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSASYNCDOOMEVENT_RUN));
if (mDescriptor->mCacheEntry) {
status = nsCacheService::gService->DoomEntry_Internal(
mDescriptor->mCacheEntry, true);
} else if (!mDescriptor->mDoomedOnClose) {
status = NS_ERROR_NOT_AVAILABLE;
}
}
if (mListener) {
mThread->Dispatch(new nsNotifyDoomListener(mListener, status),
NS_DISPATCH_NORMAL);
// posted event will release the reference on the correct thread
mListener = nullptr;
}
return NS_OK;
}
private:
nsRefPtr<nsCacheEntryDescriptor> mDescriptor;
nsICacheListener *mListener;
nsCOMPtr<nsIThread> mThread;
};
NS_IMPL_ISUPPORTS(nsCacheEntryDescriptor,
nsICacheEntryDescriptor,
nsICacheEntryInfo)
nsCacheEntryDescriptor::nsCacheEntryDescriptor(nsCacheEntry * entry,
nsCacheAccessMode accessGranted)
: mCacheEntry(entry),
mAccessGranted(accessGranted),
mOutputWrapper(nullptr),
mLock("nsCacheEntryDescriptor.mLock"),
mAsyncDoomPending(false),
mDoomedOnClose(false),
mClosingDescriptor(false)
{
PR_INIT_CLIST(this);
NS_ADDREF(nsCacheService::GlobalInstance()); // ensure it lives for the lifetime of the descriptor
}
nsCacheEntryDescriptor::~nsCacheEntryDescriptor()
{
// No need to close if the cache entry has already been severed. This
// helps avoid a shutdown assertion (bug 285519) that is caused when
// consumers end up holding onto these objects past xpcom-shutdown. It's
// okay for them to do that because the cache service calls our Close
// method during xpcom-shutdown, so we don't need to complain about it.
if (mCacheEntry)
Close();
NS_ASSERTION(mInputWrappers.IsEmpty(),
"We have still some input wrapper!");
NS_ASSERTION(!mOutputWrapper, "We have still an output wrapper!");
nsCacheService * service = nsCacheService::GlobalInstance();
NS_RELEASE(service);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetClientID(char ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETCLIENTID));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return ClientIDFromCacheKey(*(mCacheEntry->Key()), result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetDeviceID(char ** aDeviceID)
{
NS_ENSURE_ARG_POINTER(aDeviceID);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETDEVICEID));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
const char* deviceID = mCacheEntry->GetDeviceID();
if (!deviceID) {
*aDeviceID = nullptr;
return NS_OK;
}
*aDeviceID = NS_strdup(deviceID);
return *aDeviceID ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetKey(nsACString &result)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETKEY));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return ClientKeyFromCacheKey(*(mCacheEntry->Key()), result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetFetchCount(int32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETFETCHCOUNT));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->FetchCount();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetLastFetched(uint32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETLASTFETCHED));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->LastFetched();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetLastModified(uint32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETLASTMODIFIED));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->LastModified();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetExpirationTime(uint32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETEXPIRATIONTIME));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->ExpirationTime();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetExpirationTime(uint32_t expirationTime)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETEXPIRATIONTIME));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetExpirationTime(expirationTime);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::IsStreamBased(bool *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_ISSTREAMBASED));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->IsStreamData();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::GetPredictedDataSize(int64_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETPREDICTEDDATASIZE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->PredictedDataSize();
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::SetPredictedDataSize(int64_t
predictedSize)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETPREDICTEDDATASIZE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetPredictedDataSize(predictedSize);
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::GetDataSize(uint32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETDATASIZE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
const char* val = mCacheEntry->GetMetaDataElement("uncompressed-len");
if (!val) {
*result = mCacheEntry->DataSize();
} else {
*result = atol(val);
}
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::GetStorageDataSize(uint32_t *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETSTORAGEDATASIZE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->DataSize();
return NS_OK;
}
nsresult
nsCacheEntryDescriptor::RequestDataSizeChange(int32_t deltaSize)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_REQUESTDATASIZECHANGE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
nsresult rv;
rv = nsCacheService::OnDataSizeChange(mCacheEntry, deltaSize);
if (NS_SUCCEEDED(rv)) {
// XXX review for signed/unsigned math errors
uint32_t newDataSize = mCacheEntry->DataSize() + deltaSize;
mCacheEntry->SetDataSize(newDataSize);
mCacheEntry->TouchData();
}
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetDataSize(uint32_t dataSize)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETDATASIZE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX review for signed/unsigned math errors
int32_t deltaSize = dataSize - mCacheEntry->DataSize();
nsresult rv;
rv = nsCacheService::OnDataSizeChange(mCacheEntry, deltaSize);
// this had better be NS_OK, this call instance is advisory for memory cache objects
if (NS_SUCCEEDED(rv)) {
// XXX review for signed/unsigned math errors
uint32_t newDataSize = mCacheEntry->DataSize() + deltaSize;
mCacheEntry->SetDataSize(newDataSize);
mCacheEntry->TouchData();
} else {
NS_WARNING("failed SetDataSize() on memory cache object!");
}
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::OpenInputStream(uint32_t offset, nsIInputStream ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsInputStreamWrapper* cacheInput = nullptr;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_OPENINPUTSTREAM));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (!mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_NOT_STREAM;
// Don't open any new stream when closing descriptor or clearing entries
if (mClosingDescriptor || nsCacheService::GetClearingEntries())
return NS_ERROR_NOT_AVAILABLE;
// ensure valid permissions
if (!(mAccessGranted & nsICache::ACCESS_READ))
return NS_ERROR_CACHE_READ_ACCESS_DENIED;
const char *val;
val = mCacheEntry->GetMetaDataElement("uncompressed-len");
if (val) {
cacheInput = new nsDecompressInputStreamWrapper(this, offset);
} else {
cacheInput = new nsInputStreamWrapper(this, offset);
}
if (!cacheInput) return NS_ERROR_OUT_OF_MEMORY;
mInputWrappers.AppendElement(cacheInput);
}
NS_ADDREF(*result = cacheInput);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::OpenOutputStream(uint32_t offset, nsIOutputStream ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsOutputStreamWrapper* cacheOutput = nullptr;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_OPENOUTPUTSTREAM));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (!mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_NOT_STREAM;
// Don't open any new stream when closing descriptor or clearing entries
if (mClosingDescriptor || nsCacheService::GetClearingEntries())
return NS_ERROR_NOT_AVAILABLE;
// ensure valid permissions
if (!(mAccessGranted & nsICache::ACCESS_WRITE))
return NS_ERROR_CACHE_WRITE_ACCESS_DENIED;
int32_t compressionLevel = nsCacheService::CacheCompressionLevel();
const char *val;
val = mCacheEntry->GetMetaDataElement("uncompressed-len");
if ((compressionLevel > 0) && val) {
cacheOutput = new nsCompressOutputStreamWrapper(this, offset);
} else {
// clear compression flag when compression disabled - see bug 715198
if (val) {
mCacheEntry->SetMetaDataElement("uncompressed-len", nullptr);
}
cacheOutput = new nsOutputStreamWrapper(this, offset);
}
if (!cacheOutput) return NS_ERROR_OUT_OF_MEMORY;
mOutputWrapper = cacheOutput;
}
NS_ADDREF(*result = cacheOutput);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetCacheElement(nsISupports ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETCACHEELEMENT));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_STREAM;
NS_IF_ADDREF(*result = mCacheEntry->Data());
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetCacheElement(nsISupports * cacheElement)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETCACHEELEMENT));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
if (mCacheEntry->IsStreamData()) return NS_ERROR_CACHE_DATA_IS_STREAM;
return nsCacheService::SetCacheElement(mCacheEntry, cacheElement);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetAccessGranted(nsCacheAccessMode *result)
{
NS_ENSURE_ARG_POINTER(result);
*result = mAccessGranted;
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetStoragePolicy(nsCacheStoragePolicy *result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETSTORAGEPOLICY));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->StoragePolicy();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetStoragePolicy(nsCacheStoragePolicy policy)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETSTORAGEPOLICY));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX validate policy against session?
bool storageEnabled = false;
storageEnabled = nsCacheService::IsStorageEnabledForPolicy_Locked(policy);
if (!storageEnabled) return NS_ERROR_FAILURE;
// Don't change the storage policy of entries we can't write
if (!(mAccessGranted & nsICache::ACCESS_WRITE))
return NS_ERROR_NOT_AVAILABLE;
// Don't allow a cache entry to move from memory-only to anything else
if (mCacheEntry->StoragePolicy() == nsICache::STORE_IN_MEMORY &&
policy != nsICache::STORE_IN_MEMORY)
return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetStoragePolicy(policy);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetFile(nsIFile ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETFILE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return nsCacheService::GetFileForEntry(mCacheEntry, result);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetSecurityInfo(nsISupports ** result)
{
NS_ENSURE_ARG_POINTER(result);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETSECURITYINFO));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
*result = mCacheEntry->SecurityInfo();
NS_IF_ADDREF(*result);
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetSecurityInfo(nsISupports * securityInfo)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETSECURITYINFO));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
mCacheEntry->SetSecurityInfo(securityInfo);
mCacheEntry->MarkEntryDirty();
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::Doom()
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_DOOM));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return nsCacheService::DoomEntry(mCacheEntry);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::DoomAndFailPendingRequests(nsresult status)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_DOOMANDFAILPENDINGREQUESTS));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::AsyncDoom(nsICacheListener *listener)
{
bool asyncDoomPending;
{
mozilla::MutexAutoLock lock(mLock);
asyncDoomPending = mAsyncDoomPending;
mAsyncDoomPending = true;
}
if (asyncDoomPending) {
// AsyncDoom was already called. Notify listener if it is non-null,
// otherwise just return success.
if (listener) {
nsresult rv = NS_DispatchToCurrentThread(
new nsNotifyDoomListener(listener, NS_ERROR_NOT_AVAILABLE));
if (NS_SUCCEEDED(rv))
NS_IF_ADDREF(listener);
return rv;
}
return NS_OK;
}
nsRefPtr<nsIRunnable> event = new nsAsyncDoomEvent(this, listener);
return nsCacheService::DispatchToCacheIOThread(event);
}
NS_IMETHODIMP
nsCacheEntryDescriptor::MarkValid()
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_MARKVALID));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
nsresult rv = nsCacheService::ValidateEntry(mCacheEntry);
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::Close()
{
nsRefPtr<nsOutputStreamWrapper> outputWrapper;
nsTArray<nsRefPtr<nsInputStreamWrapper> > inputWrappers;
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_CLOSE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// Make sure no other stream can be opened
mClosingDescriptor = true;
outputWrapper = mOutputWrapper;
for (size_t i = 0; i < mInputWrappers.Length(); i++)
inputWrappers.AppendElement(mInputWrappers[i]);
}
// Call Close() on the streams outside the lock since it might need to call
// methods that grab the cache service lock, e.g. compressed output stream
// when it finalizes the entry
if (outputWrapper) {
if (NS_FAILED(outputWrapper->Close())) {
NS_WARNING("Dooming entry because Close() failed!!!");
Doom();
}
outputWrapper = nullptr;
}
for (uint32_t i = 0 ; i < inputWrappers.Length() ; i++)
inputWrappers[i]->Close();
inputWrappers.Clear();
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_CLOSE));
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
// XXX perhaps closing descriptors should clear/sever transports
// tell nsCacheService we're going away
nsCacheService::CloseDescriptor(this);
NS_ASSERTION(mCacheEntry == nullptr, "mCacheEntry not null");
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::GetMetaDataElement(const char *key, char **result)
{
NS_ENSURE_ARG_POINTER(key);
*result = nullptr;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_GETMETADATAELEMENT));
NS_ENSURE_TRUE(mCacheEntry, NS_ERROR_NOT_AVAILABLE);
const char *value;
value = mCacheEntry->GetMetaDataElement(key);
if (!value) return NS_ERROR_NOT_AVAILABLE;
*result = NS_strdup(value);
if (!*result) return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::SetMetaDataElement(const char *key, const char *value)
{
NS_ENSURE_ARG_POINTER(key);
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_SETMETADATAELEMENT));
NS_ENSURE_TRUE(mCacheEntry, NS_ERROR_NOT_AVAILABLE);
// XXX allow null value, for clearing key?
nsresult rv = mCacheEntry->SetMetaDataElement(key, value);
if (NS_SUCCEEDED(rv))
mCacheEntry->TouchMetaData();
return rv;
}
NS_IMETHODIMP
nsCacheEntryDescriptor::VisitMetaData(nsICacheMetaDataVisitor * visitor)
{
nsCacheServiceAutoLock lock(LOCK_TELEM(NSCACHEENTRYDESCRIPTOR_VISITMETADATA));
// XXX check callers, we're calling out of module
NS_ENSURE_ARG_POINTER(visitor);
if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
return mCacheEntry->VisitMetaDataElements(visitor);
}
/******************************************************************************
* nsCacheInputStream - a wrapper for nsIInputStream keeps the cache entry
* open while referenced.
******************************************************************************/
NS_IMPL_ADDREF(nsCacheEntryDescriptor::nsInputStreamWrapper)
NS_IMETHODIMP_(MozExternalRefCountType)
nsCacheEntryDescriptor::nsInputStreamWrapper::Release()
{
// Holding a reference to descriptor ensures that cache service won't go
// away. Do not grab cache service lock if there is no descriptor.
nsRefPtr<nsCacheEntryDescriptor> desc;
{
mozilla::MutexAutoLock lock(mLock);
desc = mDescriptor;
}
if (desc)
nsCacheService::Lock(LOCK_TELEM(NSINPUTSTREAMWRAPPER_RELEASE));
nsrefcnt count;
NS_PRECONDITION(0 != mRefCnt, "dup release");
count = --mRefCnt;
NS_LOG_RELEASE(this, count, "nsCacheEntryDescriptor::nsInputStreamWrapper");
if (0 == count) {
// don't use desc here since mDescriptor might be already nulled out
if (mDescriptor) {
NS_ASSERTION(mDescriptor->mInputWrappers.Contains(this),
"Wrapper not found in array!");
mDescriptor->mInputWrappers.RemoveElement(this);
}
if (desc)
nsCacheService::Unlock();
mRefCnt = 1;
delete (this);
return 0;
}
if (desc)
nsCacheService::Unlock();
return count;
}
NS_INTERFACE_MAP_BEGIN(nsCacheEntryDescriptor::nsInputStreamWrapper)
NS_INTERFACE_MAP_ENTRY(nsIInputStream)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END_THREADSAFE
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::LazyInit()
{
// Check if we have the descriptor. If not we can't even grab the cache
// lock since it is not ensured that the cache service still exists.
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSINPUTSTREAMWRAPPER_LAZYINIT));
nsCacheAccessMode mode;
nsresult rv = mDescriptor->GetAccessGranted(&mode);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(mode & nsICache::ACCESS_READ, NS_ERROR_UNEXPECTED);
nsCacheEntry* cacheEntry = mDescriptor->CacheEntry();
if (!cacheEntry) return NS_ERROR_NOT_AVAILABLE;
rv = nsCacheService::OpenInputStreamForEntry(cacheEntry, mode,
mStartOffset,
getter_AddRefs(mInput));
CACHE_LOG_DEBUG(("nsInputStreamWrapper::LazyInit "
"[entry=%p, wrapper=%p, mInput=%p, rv=%d]",
mDescriptor, this, mInput.get(), int(rv)));
if (NS_FAILED(rv)) return rv;
mInitialized = true;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::EnsureInit()
{
if (mInitialized) {
NS_ASSERTION(mDescriptor, "Bad state");
return NS_OK;
}
return LazyInit();
}
void nsCacheEntryDescriptor::
nsInputStreamWrapper::CloseInternal()
{
mLock.AssertCurrentThreadOwns();
if (!mDescriptor) {
NS_ASSERTION(!mInitialized, "Bad state");
NS_ASSERTION(!mInput, "Bad state");
return;
}
nsCacheServiceAutoLock lock(LOCK_TELEM(NSINPUTSTREAMWRAPPER_CLOSEINTERNAL));
if (mDescriptor) {
mDescriptor->mInputWrappers.RemoveElement(this);
nsCacheService::ReleaseObject_Locked(mDescriptor);
mDescriptor = nullptr;
}
mInitialized = false;
mInput = nullptr;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Close()
{
mozilla::MutexAutoLock lock(mLock);
return Close_Locked();
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Close_Locked()
{
nsresult rv = EnsureInit();
if (NS_SUCCEEDED(rv)) {
rv = mInput->Close();
} else {
NS_ASSERTION(!mInput,
"Shouldn't have mInput when EnsureInit() failed");
}
// Call CloseInternal() even when EnsureInit() failed, e.g. in case we are
// closing streams with nsCacheService::CloseAllStream()
CloseInternal();
return rv;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Available(uint64_t *avail)
{
mozilla::MutexAutoLock lock(mLock);
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mInput->Available(avail);
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Read(char *buf, uint32_t count, uint32_t *countRead)
{
mozilla::MutexAutoLock lock(mLock);
return Read_Locked(buf, count, countRead);
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::Read_Locked(char *buf, uint32_t count, uint32_t *countRead)
{
nsresult rv = EnsureInit();
if (NS_SUCCEEDED(rv))
rv = mInput->Read(buf, count, countRead);
CACHE_LOG_DEBUG(("nsInputStreamWrapper::Read "
"[entry=%p, wrapper=%p, mInput=%p, rv=%d]",
mDescriptor, this, mInput.get(), rv));
return rv;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::ReadSegments(nsWriteSegmentFun writer, void *closure,
uint32_t count, uint32_t *countRead)
{
// cache stream not buffered
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsCacheEntryDescriptor::
nsInputStreamWrapper::IsNonBlocking(bool *result)
{
// cache streams will never return NS_BASE_STREAM_WOULD_BLOCK
*result = false;
return NS_OK;
}
/******************************************************************************
* nsDecompressInputStreamWrapper - an input stream wrapper that decompresses
******************************************************************************/
NS_IMPL_ADDREF(nsCacheEntryDescriptor::nsDecompressInputStreamWrapper)
NS_IMETHODIMP_(MozExternalRefCountType)
nsCacheEntryDescriptor::nsDecompressInputStreamWrapper::Release()
{
// Holding a reference to descriptor ensures that cache service won't go
// away. Do not grab cache service lock if there is no descriptor.
nsRefPtr<nsCacheEntryDescriptor> desc;
{
mozilla::MutexAutoLock lock(mLock);
desc = mDescriptor;
}
if (desc)
nsCacheService::Lock(LOCK_TELEM(
NSDECOMPRESSINPUTSTREAMWRAPPER_RELEASE));
nsrefcnt count;
NS_PRECONDITION(0 != mRefCnt, "dup release");
count = --mRefCnt;
NS_LOG_RELEASE(this, count,
"nsCacheEntryDescriptor::nsDecompressInputStreamWrapper");
if (0 == count) {
// don't use desc here since mDescriptor might be already nulled out
if (mDescriptor) {
NS_ASSERTION(mDescriptor->mInputWrappers.Contains(this),
"Wrapper not found in array!");
mDescriptor->mInputWrappers.RemoveElement(this);
}
if (desc)
nsCacheService::Unlock();
mRefCnt = 1;
delete (this);
return 0;
}
if (desc)
nsCacheService::Unlock();
return count;
}
NS_INTERFACE_MAP_BEGIN(nsCacheEntryDescriptor::nsDecompressInputStreamWrapper)
NS_INTERFACE_MAP_ENTRY(nsIInputStream)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END_THREADSAFE
NS_IMETHODIMP nsCacheEntryDescriptor::
nsDecompressInputStreamWrapper::Read(char * buf,
uint32_t count,
uint32_t *countRead)
{
mozilla::MutexAutoLock lock(mLock);
int zerr = Z_OK;
nsresult rv = NS_OK;
if (!mStreamInitialized) {
rv = InitZstream();
if (NS_FAILED(rv)) {
return rv;
}
}
mZstream.next_out = (Bytef*)buf;
mZstream.avail_out = count;
if (mReadBufferLen < count) {
// Allocate a buffer for reading from the input stream. This will
// determine the max number of compressed bytes read from the
// input stream at one time. Making the buffer size proportional
// to the request size is not necessary, but helps minimize the
// number of read requests to the input stream.
uint32_t newBufLen = std::max(count, (uint32_t)kMinDecompressReadBufLen);
unsigned char* newBuf;
newBuf = (unsigned char*)nsMemory::Realloc(mReadBuffer,
newBufLen);
if (newBuf) {
mReadBuffer = newBuf;
mReadBufferLen = newBufLen;
}
if (!mReadBuffer) {
mReadBufferLen = 0;
return NS_ERROR_OUT_OF_MEMORY;
}
}
// read and inflate data until the output buffer is full, or
// there is no more data to read
while (NS_SUCCEEDED(rv) &&
zerr == Z_OK &&
mZstream.avail_out > 0 &&
count > 0) {
if (mZstream.avail_in == 0) {
rv = nsInputStreamWrapper::Read_Locked((char*)mReadBuffer,
mReadBufferLen,
&mZstream.avail_in);
if (NS_FAILED(rv) || !mZstream.avail_in) {
break;
}
mZstream.next_in = mReadBuffer;
}
zerr = inflate(&mZstream, Z_NO_FLUSH);
if (zerr == Z_STREAM_END) {
// The compressed data may have been stored in multiple
// chunks/streams. To allow for this case, re-initialize
// the inflate stream and continue decompressing from
// the next byte.
Bytef * saveNextIn = mZstream.next_in;
unsigned int saveAvailIn = mZstream.avail_in;
Bytef * saveNextOut = mZstream.next_out;
unsigned int saveAvailOut = mZstream.avail_out;
inflateReset(&mZstream);
mZstream.next_in = saveNextIn;
mZstream.avail_in = saveAvailIn;
mZstream.next_out = saveNextOut;
mZstream.avail_out = saveAvailOut;
zerr = Z_OK;
} else if (zerr != Z_OK) {
rv = NS_ERROR_INVALID_CONTENT_ENCODING;
}
}
if (NS_SUCCEEDED(rv)) {
*countRead = count - mZstream.avail_out;
}
return rv;
}
nsresult nsCacheEntryDescriptor::
nsDecompressInputStreamWrapper::Close()
{
mozilla::MutexAutoLock lock(mLock);
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
EndZstream();
if (mReadBuffer) {
nsMemory::Free(mReadBuffer);
mReadBuffer = 0;
mReadBufferLen = 0;
}
return nsInputStreamWrapper::Close_Locked();
}
nsresult nsCacheEntryDescriptor::
nsDecompressInputStreamWrapper::InitZstream()
{
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
if (mStreamEnded)
return NS_ERROR_FAILURE;
// Initialize zlib inflate stream
mZstream.zalloc = Z_NULL;
mZstream.zfree = Z_NULL;
mZstream.opaque = Z_NULL;
mZstream.next_out = Z_NULL;
mZstream.avail_out = 0;
mZstream.next_in = Z_NULL;
mZstream.avail_in = 0;
if (inflateInit(&mZstream) != Z_OK) {
return NS_ERROR_FAILURE;
}
mStreamInitialized = true;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsDecompressInputStreamWrapper::EndZstream()
{
if (mStreamInitialized && !mStreamEnded) {
inflateEnd(&mZstream);
mStreamInitialized = false;
mStreamEnded = true;
}
return NS_OK;
}
/******************************************************************************
* nsOutputStreamWrapper - a wrapper for nsIOutputstream to track the amount of
* data written to a cache entry.
* - also keeps the cache entry open while referenced.
******************************************************************************/
NS_IMPL_ADDREF(nsCacheEntryDescriptor::nsOutputStreamWrapper)
NS_IMETHODIMP_(MozExternalRefCountType)
nsCacheEntryDescriptor::nsOutputStreamWrapper::Release()
{
// Holding a reference to descriptor ensures that cache service won't go
// away. Do not grab cache service lock if there is no descriptor.
nsRefPtr<nsCacheEntryDescriptor> desc;
{
mozilla::MutexAutoLock lock(mLock);
desc = mDescriptor;
}
if (desc)
nsCacheService::Lock(LOCK_TELEM(NSOUTPUTSTREAMWRAPPER_RELEASE));
nsrefcnt count;
NS_PRECONDITION(0 != mRefCnt, "dup release");
count = --mRefCnt;
NS_LOG_RELEASE(this, count,
"nsCacheEntryDescriptor::nsOutputStreamWrapper");
if (0 == count) {
// don't use desc here since mDescriptor might be already nulled out
if (mDescriptor)
mDescriptor->mOutputWrapper = nullptr;
if (desc)
nsCacheService::Unlock();
mRefCnt = 1;
delete (this);
return 0;
}
if (desc)
nsCacheService::Unlock();
return count;
}
NS_INTERFACE_MAP_BEGIN(nsCacheEntryDescriptor::nsOutputStreamWrapper)
NS_INTERFACE_MAP_ENTRY(nsIOutputStream)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END_THREADSAFE
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::LazyInit()
{
// Check if we have the descriptor. If not we can't even grab the cache
// lock since it is not ensured that the cache service still exists.
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
nsCacheServiceAutoLock lock(LOCK_TELEM(NSOUTPUTSTREAMWRAPPER_LAZYINIT));
nsCacheAccessMode mode;
nsresult rv = mDescriptor->GetAccessGranted(&mode);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(mode & nsICache::ACCESS_WRITE, NS_ERROR_UNEXPECTED);
nsCacheEntry* cacheEntry = mDescriptor->CacheEntry();
if (!cacheEntry) return NS_ERROR_NOT_AVAILABLE;
NS_ASSERTION(mOutput == nullptr, "mOutput set in LazyInit");
nsCOMPtr<nsIOutputStream> stream;
rv = nsCacheService::OpenOutputStreamForEntry(cacheEntry, mode, mStartOffset,
getter_AddRefs(stream));
if (NS_FAILED(rv))
return rv;
nsCacheDevice* device = cacheEntry->CacheDevice();
if (device) {
// the entry has been truncated to mStartOffset bytes, inform device
int32_t size = cacheEntry->DataSize();
rv = device->OnDataSizeChange(cacheEntry, mStartOffset - size);
if (NS_SUCCEEDED(rv))
cacheEntry->SetDataSize(mStartOffset);
} else {
rv = NS_ERROR_NOT_AVAILABLE;
}
// If anything above failed, clean up internal state and get out of here
// (see bug #654926)...
if (NS_FAILED(rv)) {
nsCacheService::ReleaseObject_Locked(stream.forget().take());
mDescriptor->mOutputWrapper = nullptr;
nsCacheService::ReleaseObject_Locked(mDescriptor);
mDescriptor = nullptr;
mInitialized = false;
return rv;
}
mOutput = stream;
mInitialized = true;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::EnsureInit()
{
if (mInitialized) {
NS_ASSERTION(mDescriptor, "Bad state");
return NS_OK;
}
return LazyInit();
}
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::OnWrite(uint32_t count)
{
if (count > INT32_MAX) return NS_ERROR_UNEXPECTED;
return mDescriptor->RequestDataSizeChange((int32_t)count);
}
void nsCacheEntryDescriptor::
nsOutputStreamWrapper::CloseInternal()
{
mLock.AssertCurrentThreadOwns();
if (!mDescriptor) {
NS_ASSERTION(!mInitialized, "Bad state");
NS_ASSERTION(!mOutput, "Bad state");
return;
}
nsCacheServiceAutoLock lock(LOCK_TELEM(NSOUTPUTSTREAMWRAPPER_CLOSEINTERNAL));
if (mDescriptor) {
mDescriptor->mOutputWrapper = nullptr;
nsCacheService::ReleaseObject_Locked(mDescriptor);
mDescriptor = nullptr;
}
mInitialized = false;
mOutput = nullptr;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Close()
{
mozilla::MutexAutoLock lock(mLock);
return Close_Locked();
}
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::Close_Locked()
{
nsresult rv = EnsureInit();
if (NS_SUCCEEDED(rv)) {
rv = mOutput->Close();
} else {
NS_ASSERTION(!mOutput,
"Shouldn't have mOutput when EnsureInit() failed");
}
// Call CloseInternal() even when EnsureInit() failed, e.g. in case we are
// closing streams with nsCacheService::CloseAllStream()
CloseInternal();
return rv;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Flush()
{
mozilla::MutexAutoLock lock(mLock);
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
return mOutput->Flush();
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::Write(const char * buf,
uint32_t count,
uint32_t * result)
{
mozilla::MutexAutoLock lock(mLock);
return Write_Locked(buf, count, result);
}
nsresult nsCacheEntryDescriptor::
nsOutputStreamWrapper::Write_Locked(const char * buf,
uint32_t count,
uint32_t * result)
{
nsresult rv = EnsureInit();
if (NS_FAILED(rv)) return rv;
rv = OnWrite(count);
if (NS_FAILED(rv)) return rv;
return mOutput->Write(buf, count, result);
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::WriteFrom(nsIInputStream * inStr,
uint32_t count,
uint32_t * result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::WriteSegments(nsReadSegmentFun reader,
void * closure,
uint32_t count,
uint32_t * result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsOutputStreamWrapper::IsNonBlocking(bool *result)
{
// cache streams will never return NS_BASE_STREAM_WOULD_BLOCK
*result = false;
return NS_OK;
}
/******************************************************************************
* nsCompressOutputStreamWrapper - an output stream wrapper that compresses
* data before it is written
******************************************************************************/
NS_IMPL_ADDREF(nsCacheEntryDescriptor::nsCompressOutputStreamWrapper)
NS_IMETHODIMP_(MozExternalRefCountType)
nsCacheEntryDescriptor::nsCompressOutputStreamWrapper::Release()
{
// Holding a reference to descriptor ensures that cache service won't go
// away. Do not grab cache service lock if there is no descriptor.
nsRefPtr<nsCacheEntryDescriptor> desc;
{
mozilla::MutexAutoLock lock(mLock);
desc = mDescriptor;
}
if (desc)
nsCacheService::Lock(LOCK_TELEM(NSCOMPRESSOUTPUTSTREAMWRAPPER_RELEASE));
nsrefcnt count;
NS_PRECONDITION(0 != mRefCnt, "dup release");
count = --mRefCnt;
NS_LOG_RELEASE(this, count,
"nsCacheEntryDescriptor::nsCompressOutputStreamWrapper");
if (0 == count) {
// don't use desc here since mDescriptor might be already nulled out
if (mDescriptor)
mDescriptor->mOutputWrapper = nullptr;
if (desc)
nsCacheService::Unlock();
mRefCnt = 1;
delete (this);
return 0;
}
if (desc)
nsCacheService::Unlock();
return count;
}
NS_INTERFACE_MAP_BEGIN(nsCacheEntryDescriptor::nsCompressOutputStreamWrapper)
NS_INTERFACE_MAP_ENTRY(nsIOutputStream)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END_THREADSAFE
NS_IMETHODIMP nsCacheEntryDescriptor::
nsCompressOutputStreamWrapper::Write(const char * buf,
uint32_t count,
uint32_t * result)
{
mozilla::MutexAutoLock lock(mLock);
int zerr = Z_OK;
nsresult rv = NS_OK;
if (!mStreamInitialized) {
rv = InitZstream();
if (NS_FAILED(rv)) {
return rv;
}
}
if (!mWriteBuffer) {
// Once allocated, this buffer is referenced by the zlib stream and
// cannot be grown. We use 2x(initial write request) to approximate
// a stream buffer size proportional to request buffers.
mWriteBufferLen = std::max(count*2, (uint32_t)kMinCompressWriteBufLen);
mWriteBuffer = (unsigned char*)nsMemory::Alloc(mWriteBufferLen);
if (!mWriteBuffer) {
mWriteBufferLen = 0;
return NS_ERROR_OUT_OF_MEMORY;
}
mZstream.next_out = mWriteBuffer;
mZstream.avail_out = mWriteBufferLen;
}
// Compress (deflate) the requested buffer. Keep going
// until the entire buffer has been deflated.
mZstream.avail_in = count;
mZstream.next_in = (Bytef*)buf;
while (mZstream.avail_in > 0) {
zerr = deflate(&mZstream, Z_NO_FLUSH);
if (zerr == Z_STREAM_ERROR) {
deflateEnd(&mZstream);
mStreamEnded = true;
mStreamInitialized = false;
return NS_ERROR_FAILURE;
}
// Note: Z_BUF_ERROR is non-fatal and sometimes expected here.
// If the compression stream output buffer is filled, write
// it out to the underlying stream wrapper.
if (mZstream.avail_out == 0) {
rv = WriteBuffer();
if (NS_FAILED(rv)) {
deflateEnd(&mZstream);
mStreamEnded = true;
mStreamInitialized = false;
return rv;
}
}
}
*result = count;
mUncompressedCount += *result;
return NS_OK;
}
NS_IMETHODIMP nsCacheEntryDescriptor::
nsCompressOutputStreamWrapper::Close()
{
mozilla::MutexAutoLock lock(mLock);
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
nsresult retval = NS_OK;
nsresult rv;
int zerr = 0;
if (mStreamInitialized) {
// complete compression of any data remaining in the zlib stream
do {
zerr = deflate(&mZstream, Z_FINISH);
rv = WriteBuffer();
if (NS_FAILED(rv))
retval = rv;
} while (zerr == Z_OK && rv == NS_OK);
deflateEnd(&mZstream);
mStreamInitialized = false;
}
// Do not allow to initialize stream after calling Close().
mStreamEnded = true;
if (mDescriptor->CacheEntry()) {
nsAutoCString uncompressedLenStr;
rv = mDescriptor->GetMetaDataElement("uncompressed-len",
getter_Copies(uncompressedLenStr));
if (NS_SUCCEEDED(rv)) {
int32_t oldCount = uncompressedLenStr.ToInteger(&rv);
if (NS_SUCCEEDED(rv)) {
mUncompressedCount += oldCount;
}
}
uncompressedLenStr.Adopt(0);
uncompressedLenStr.AppendInt(mUncompressedCount);
rv = mDescriptor->SetMetaDataElement("uncompressed-len",
uncompressedLenStr.get());
if (NS_FAILED(rv))
retval = rv;
}
if (mWriteBuffer) {
nsMemory::Free(mWriteBuffer);
mWriteBuffer = 0;
mWriteBufferLen = 0;
}
rv = nsOutputStreamWrapper::Close_Locked();
if (NS_FAILED(rv))
retval = rv;
return retval;
}
nsresult nsCacheEntryDescriptor::
nsCompressOutputStreamWrapper::InitZstream()
{
if (!mDescriptor)
return NS_ERROR_NOT_AVAILABLE;
if (mStreamEnded)
return NS_ERROR_FAILURE;
// Determine compression level: Aggressive compression
// may impact performance on mobile devices, while a
// lower compression level still provides substantial
// space savings for many text streams.
int32_t compressionLevel = nsCacheService::CacheCompressionLevel();
// Initialize zlib deflate stream
mZstream.zalloc = Z_NULL;
mZstream.zfree = Z_NULL;
mZstream.opaque = Z_NULL;
if (deflateInit2(&mZstream, compressionLevel, Z_DEFLATED,
MAX_WBITS, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
return NS_ERROR_FAILURE;
}
mZstream.next_in = Z_NULL;
mZstream.avail_in = 0;
mStreamInitialized = true;
return NS_OK;
}
nsresult nsCacheEntryDescriptor::
nsCompressOutputStreamWrapper::WriteBuffer()
{
uint32_t bytesToWrite = mWriteBufferLen - mZstream.avail_out;
uint32_t result = 0;
nsresult rv = nsCacheEntryDescriptor::nsOutputStreamWrapper::Write_Locked(
(const char *)mWriteBuffer, bytesToWrite, &result);
mZstream.next_out = mWriteBuffer;
mZstream.avail_out = mWriteBufferLen;
return rv;
}
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