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tenfourfox/widget/nsTransferable.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
Notes to self:
- at some point, strings will be accessible from JS, so we won't have to wrap
flavors in an nsISupportsCString. Until then, we're kinda stuck with
this crappy API of nsISupportsArrays.
*/
#include "nsTransferable.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsTArray.h"
#include "nsIFormatConverter.h"
#include "nsIComponentManager.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsMemory.h"
#include "nsPrimitiveHelpers.h"
#include "nsXPIDLString.h"
#include "nsDirectoryServiceDefs.h"
#include "nsDirectoryService.h"
#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsIDOMNode.h"
#include "nsIOutputStream.h"
#include "nsIInputStream.h"
#include "nsIWeakReferenceUtils.h"
#include "nsIFile.h"
#include "nsILoadContext.h"
#include "nsAutoPtr.h"
NS_IMPL_ISUPPORTS(nsTransferable, nsITransferable)
size_t GetDataForFlavor (const nsTArray<DataStruct>& aArray,
const char* aDataFlavor)
{
for (size_t i = 0 ; i < aArray.Length () ; ++i) {
if (aArray[i].GetFlavor().Equals (aDataFlavor))
return i;
}
return aArray.NoIndex;
}
//-------------------------------------------------------------------------
DataStruct::~DataStruct()
{
if (mCacheFileName) free(mCacheFileName);
}
//-------------------------------------------------------------------------
void
DataStruct::SetData ( nsISupports* aData, uint32_t aDataLen, bool aIsPrivateData )
{
// Now, check to see if we consider the data to be "too large"
// as well as ensuring that private browsing mode is disabled
if (aDataLen > kLargeDatasetSize && !aIsPrivateData) {
// if so, cache it to disk instead of memory
if ( NS_SUCCEEDED(WriteCache(aData, aDataLen)) )
return;
else
NS_WARNING("Oh no, couldn't write data to the cache file");
}
mData = aData;
mDataLen = aDataLen;
}
//-------------------------------------------------------------------------
void
DataStruct::GetData ( nsISupports** aData, uint32_t *aDataLen )
{
// check here to see if the data is cached on disk
if ( !mData && mCacheFileName ) {
// if so, read it in and pass it back
// ReadCache creates memory and copies the data into it.
if ( NS_SUCCEEDED(ReadCache(aData, aDataLen)) )
return;
else {
// oh shit, something went horribly wrong here.
NS_WARNING("Oh no, couldn't read data in from the cache file");
*aData = nullptr;
*aDataLen = 0;
return;
}
}
*aData = mData;
if ( mData )
NS_ADDREF(*aData);
*aDataLen = mDataLen;
}
//-------------------------------------------------------------------------
already_AddRefed<nsIFile>
DataStruct::GetFileSpec(const char* aFileName)
{
nsCOMPtr<nsIFile> cacheFile;
NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(cacheFile));
if (!cacheFile)
return nullptr;
// if the param aFileName contains a name we should use that
// because the file probably already exists
// otherwise create a unique name
if (!aFileName) {
cacheFile->AppendNative(NS_LITERAL_CSTRING("clipboardcache"));
cacheFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
} else {
cacheFile->AppendNative(nsDependentCString(aFileName));
}
return cacheFile.forget();
}
//-------------------------------------------------------------------------
nsresult
DataStruct::WriteCache(nsISupports* aData, uint32_t aDataLen)
{
// Get a new path and file to the temp directory
nsCOMPtr<nsIFile> cacheFile = GetFileSpec(mCacheFileName);
if (cacheFile) {
// remember the file name
if (!mCacheFileName) {
nsXPIDLCString fName;
cacheFile->GetNativeLeafName(fName);
mCacheFileName = strdup(fName);
}
// write out the contents of the clipboard
// to the file
//uint32_t bytes;
nsCOMPtr<nsIOutputStream> outStr;
NS_NewLocalFileOutputStream(getter_AddRefs(outStr),
cacheFile);
if (!outStr) return NS_ERROR_FAILURE;
void* buff = nullptr;
nsPrimitiveHelpers::CreateDataFromPrimitive ( mFlavor.get(), aData, &buff, aDataLen );
if ( buff ) {
uint32_t ignored;
outStr->Write(reinterpret_cast<char*>(buff), aDataLen, &ignored);
free(buff);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
nsresult
DataStruct::ReadCache(nsISupports** aData, uint32_t* aDataLen)
{
// if we don't have a cache filename we are out of luck
if (!mCacheFileName)
return NS_ERROR_FAILURE;
// get the path and file name
nsCOMPtr<nsIFile> cacheFile = GetFileSpec(mCacheFileName);
bool exists;
if ( cacheFile && NS_SUCCEEDED(cacheFile->Exists(&exists)) && exists ) {
// get the size of the file
int64_t fileSize;
int64_t max32 = 0xFFFFFFFF;
cacheFile->GetFileSize(&fileSize);
if (fileSize > max32)
return NS_ERROR_OUT_OF_MEMORY;
uint32_t size = uint32_t(fileSize);
// create new memory for the large clipboard data
auto data = MakeUnique<char[]>(size);
if ( !data )
return NS_ERROR_OUT_OF_MEMORY;
// now read it all in
nsCOMPtr<nsIInputStream> inStr;
NS_NewLocalFileInputStream( getter_AddRefs(inStr),
cacheFile);
if (!cacheFile) return NS_ERROR_FAILURE;
nsresult rv = inStr->Read(data.get(), fileSize, aDataLen);
// make sure we got all the data ok
if (NS_SUCCEEDED(rv) && *aDataLen == size) {
nsPrimitiveHelpers::CreatePrimitiveForData(mFlavor.get(), data.get(),
fileSize, aData);
return *aData ? NS_OK : NS_ERROR_FAILURE;
}
// zero the return params
*aData = nullptr;
*aDataLen = 0;
}
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
//
// Transferable constructor
//
//-------------------------------------------------------------------------
nsTransferable::nsTransferable()
: mPrivateData(false)
#ifdef DEBUG
, mInitialized(false)
#endif
{
}
//-------------------------------------------------------------------------
//
// Transferable destructor
//
//-------------------------------------------------------------------------
nsTransferable::~nsTransferable()
{
}
NS_IMETHODIMP
nsTransferable::Init(nsILoadContext* aContext)
{
MOZ_ASSERT(!mInitialized);
if (aContext) {
mPrivateData = aContext->UsePrivateBrowsing();
}
#ifdef DEBUG
mInitialized = true;
#endif
return NS_OK;
}
//
// GetTransferDataFlavors
//
// Returns a copy of the internal list of flavors. This does NOT take into
// account any converter that may be registered. This list consists of
// nsISupportsCString objects so that the flavor list can be accessed from JS.
//
nsresult
nsTransferable::GetTransferDataFlavors(nsISupportsArray ** aDataFlavorList)
{
MOZ_ASSERT(mInitialized);
nsresult rv = NS_NewISupportsArray ( aDataFlavorList );
if (NS_FAILED(rv)) return rv;
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
nsCOMPtr<nsISupportsCString> flavorWrapper = do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
if ( flavorWrapper ) {
flavorWrapper->SetData ( data.GetFlavor() );
nsCOMPtr<nsISupports> genericWrapper ( do_QueryInterface(flavorWrapper) );
(*aDataFlavorList)->AppendElement( genericWrapper );
}
}
return NS_OK;
}
//
// GetTransferData
//
// Returns the data of the requested flavor, obtained from either having the data on hand or
// using a converter to get it. The data is wrapped in a nsISupports primitive so that it is
// accessible from JS.
//
NS_IMETHODIMP
nsTransferable::GetTransferData(const char *aFlavor, nsISupports **aData, uint32_t *aDataLen)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(aFlavor && aData && aDataLen);
nsresult rv = NS_OK;
nsCOMPtr<nsISupports> savedData;
// first look and see if the data is present in one of the intrinsic flavors
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
if ( data.GetFlavor().Equals(aFlavor) ) {
nsCOMPtr<nsISupports> dataBytes;
uint32_t len;
data.GetData(getter_AddRefs(dataBytes), &len);
if (len == kFlavorHasDataProvider && dataBytes) {
// do we have a data provider?
nsCOMPtr<nsIFlavorDataProvider> dataProvider = do_QueryInterface(dataBytes);
if (dataProvider) {
rv = dataProvider->GetFlavorData(this, aFlavor,
getter_AddRefs(dataBytes), &len);
if (NS_FAILED(rv))
break; // the provider failed. fall into the converter code below.
}
}
if (dataBytes && len > 0) { // XXXmats why is zero length not ok?
*aDataLen = len;
dataBytes.forget(aData);
return NS_OK;
}
savedData = dataBytes; // return this if format converter fails
break;
}
}
bool found = false;
// if not, try using a format converter to get the requested flavor
if ( mFormatConv ) {
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
bool canConvert = false;
mFormatConv->CanConvert(data.GetFlavor().get(), aFlavor, &canConvert);
if ( canConvert ) {
nsCOMPtr<nsISupports> dataBytes;
uint32_t len;
data.GetData(getter_AddRefs(dataBytes), &len);
if (len == kFlavorHasDataProvider && dataBytes) {
// do we have a data provider?
nsCOMPtr<nsIFlavorDataProvider> dataProvider = do_QueryInterface(dataBytes);
if (dataProvider) {
rv = dataProvider->GetFlavorData(this, aFlavor,
getter_AddRefs(dataBytes), &len);
if (NS_FAILED(rv))
break; // give up
}
}
mFormatConv->Convert(data.GetFlavor().get(), dataBytes, len, aFlavor, aData, aDataLen);
found = true;
break;
}
}
}
// for backward compatibility
if (!found) {
savedData.forget(aData);
*aDataLen = 0;
}
return found ? NS_OK : NS_ERROR_FAILURE;
}
//
// GetAnyTransferData
//
// Returns the data of the first flavor found. Caller is responsible for deleting the
// flavor string.
//
NS_IMETHODIMP
nsTransferable::GetAnyTransferData(char **aFlavor, nsISupports **aData, uint32_t *aDataLen)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(aFlavor && aData && aDataLen);
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
if (data.IsDataAvailable()) {
*aFlavor = ToNewCString(data.GetFlavor());
data.GetData(aData, aDataLen);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
//
// SetTransferData
//
//
//
NS_IMETHODIMP
nsTransferable::SetTransferData(const char *aFlavor, nsISupports *aData, uint32_t aDataLen)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG(aFlavor);
// first check our intrinsic flavors to see if one has been registered.
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
if ( data.GetFlavor().Equals(aFlavor) ) {
data.SetData ( aData, aDataLen, mPrivateData );
return NS_OK;
}
}
// if not, try using a format converter to find a flavor to put the data in
if ( mFormatConv ) {
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
bool canConvert = false;
mFormatConv->CanConvert(aFlavor, data.GetFlavor().get(), &canConvert);
if ( canConvert ) {
nsCOMPtr<nsISupports> ConvertedData;
uint32_t ConvertedLen;
mFormatConv->Convert(aFlavor, aData, aDataLen, data.GetFlavor().get(), getter_AddRefs(ConvertedData), &ConvertedLen);
data.SetData(ConvertedData, ConvertedLen, mPrivateData);
return NS_OK;
}
}
}
// Can't set data neither directly nor through converter. Just add this flavor and try again
nsresult result = NS_ERROR_FAILURE;
if ( NS_SUCCEEDED(AddDataFlavor(aFlavor)) )
result = SetTransferData (aFlavor, aData, aDataLen);
return result;
}
//
// AddDataFlavor
//
// Adds a data flavor to our list with no data. Error if it already exists.
//
NS_IMETHODIMP
nsTransferable::AddDataFlavor(const char *aDataFlavor)
{
MOZ_ASSERT(mInitialized);
if (GetDataForFlavor (mDataArray, aDataFlavor) != mDataArray.NoIndex)
return NS_ERROR_FAILURE;
// Create a new "slot" for the data
mDataArray.AppendElement(DataStruct ( aDataFlavor ));
return NS_OK;
}
//
// RemoveDataFlavor
//
// Removes a data flavor (and causes the data to be destroyed). Error if
// the requested flavor is not present.
//
NS_IMETHODIMP
nsTransferable::RemoveDataFlavor(const char *aDataFlavor)
{
MOZ_ASSERT(mInitialized);
size_t idx = GetDataForFlavor(mDataArray, aDataFlavor);
if (idx != mDataArray.NoIndex) {
mDataArray.RemoveElementAt (idx);
return NS_OK;
}
return NS_ERROR_FAILURE;
}
/**
*
*
*/
NS_IMETHODIMP
nsTransferable::IsLargeDataSet(bool *_retval)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(_retval);
*_retval = false;
return NS_OK;
}
/**
*
*
*/
NS_IMETHODIMP nsTransferable::SetConverter(nsIFormatConverter * aConverter)
{
MOZ_ASSERT(mInitialized);
mFormatConv = aConverter;
return NS_OK;
}
/**
*
*
*/
NS_IMETHODIMP nsTransferable::GetConverter(nsIFormatConverter * *aConverter)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(aConverter);
*aConverter = mFormatConv;
NS_IF_ADDREF(*aConverter);
return NS_OK;
}
//
// FlavorsTransferableCanImport
//
// Computes a list of flavors that the transferable can accept into it, either through
// intrinsic knowledge or input data converters.
//
NS_IMETHODIMP
nsTransferable::FlavorsTransferableCanImport(nsISupportsArray **_retval)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(_retval);
// Get the flavor list, and on to the end of it, append the list of flavors we
// can also get to through a converter. This is so that we can just walk the list
// in one go, looking for the desired flavor.
GetTransferDataFlavors(_retval); // addrefs
nsCOMPtr<nsIFormatConverter> converter;
GetConverter(getter_AddRefs(converter));
if ( converter ) {
nsCOMPtr<nsISupportsArray> convertedList;
converter->GetInputDataFlavors(getter_AddRefs(convertedList));
if ( convertedList ) {
uint32_t importListLen;
convertedList->Count(&importListLen);
for (uint32_t i = 0; i < importListLen; ++i ) {
nsCOMPtr<nsISupports> genericFlavor;
convertedList->GetElementAt ( i, getter_AddRefs(genericFlavor) );
nsCOMPtr<nsISupportsCString> flavorWrapper ( do_QueryInterface (genericFlavor) );
nsAutoCString flavorStr;
flavorWrapper->GetData( flavorStr );
if (GetDataForFlavor (mDataArray, flavorStr.get())
== mDataArray.NoIndex) // Don't append if already in intrinsic list
(*_retval)->AppendElement (genericFlavor);
} // foreach flavor that can be converted to
}
} // if a converter exists
return NS_OK;
} // FlavorsTransferableCanImport
//
// FlavorsTransferableCanExport
//
// Computes a list of flavors that the transferable can export, either through
// intrinsic knowledge or output data converters.
//
NS_IMETHODIMP
nsTransferable::FlavorsTransferableCanExport(nsISupportsArray **_retval)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(_retval);
// Get the flavor list, and on to the end of it, append the list of flavors we
// can also get to through a converter. This is so that we can just walk the list
// in one go, looking for the desired flavor.
GetTransferDataFlavors(_retval); // addrefs
nsCOMPtr<nsIFormatConverter> converter;
GetConverter(getter_AddRefs(converter));
if ( converter ) {
nsCOMPtr<nsISupportsArray> convertedList;
converter->GetOutputDataFlavors(getter_AddRefs(convertedList));
if ( convertedList ) {
uint32_t importListLen;
convertedList->Count(&importListLen);
for ( uint32_t i=0; i < importListLen; ++i ) {
nsCOMPtr<nsISupports> genericFlavor;
convertedList->GetElementAt ( i, getter_AddRefs(genericFlavor) );
nsCOMPtr<nsISupportsCString> flavorWrapper ( do_QueryInterface (genericFlavor) );
nsAutoCString flavorStr;
flavorWrapper->GetData( flavorStr );
if (GetDataForFlavor (mDataArray, flavorStr.get())
== mDataArray.NoIndex) // Don't append if already in intrinsic list
(*_retval)->AppendElement (genericFlavor);
} // foreach flavor that can be converted to
}
} // if a converter exists
return NS_OK;
} // FlavorsTransferableCanExport
NS_IMETHODIMP
nsTransferable::GetIsPrivateData(bool *aIsPrivateData)
{
MOZ_ASSERT(mInitialized);
NS_ENSURE_ARG_POINTER(aIsPrivateData);
*aIsPrivateData = mPrivateData;
return NS_OK;
}
NS_IMETHODIMP
nsTransferable::SetIsPrivateData(bool aIsPrivateData)
{
MOZ_ASSERT(mInitialized);
mPrivateData = aIsPrivateData;
return NS_OK;
}
NS_IMETHODIMP
nsTransferable::GetRequestingNode(nsIDOMNode** outRequestingNode)
{
nsCOMPtr<nsIDOMNode> node = do_QueryReferent(mRequestingNode);
node.forget(outRequestingNode);
return NS_OK;
}
NS_IMETHODIMP
nsTransferable::SetRequestingNode(nsIDOMNode* aRequestingNode)
{
mRequestingNode = do_GetWeakReference(aRequestingNode);
return NS_OK;
}
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