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gecko-dev/xpcom/io/nsFastLoadFile.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla FastLoad code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 2001 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Brendan Eich <brendan@mozilla.org> (original author)
*/
#include <string.h>
#include "prtypes.h"
#include "nsDebug.h"
#include "nsMemory.h"
#include "nsIComponentManager.h"
#include "nsISeekableStream.h"
#include "nsISerializable.h"
#include "nsIStreamBufferAccess.h"
#include "nsBinaryStream.h"
#include "nsFastLoadFile.h"
#ifdef DEBUG_brendan
# define METERING
# define DEBUG_MUX
#endif
#ifdef METERING
# define METER(x) x
#else
# define METER(x) /* nothing */
#endif
#ifdef DEBUG_MUX
# include <stdio.h>
# include <stdarg.h>
static void trace_mux(char mode, const char *format, ...)
{
va_list ap;
static FILE *tfp;
if (!tfp) {
char tfn[16];
sprintf(tfn, "/tmp/mux.%ctrace", mode);
tfp = fopen(tfn, "w");
if (!tfp)
return;
setvbuf(tfp, NULL, _IOLBF, 0);
}
va_start(ap, format);
vfprintf(tfp, format, ap);
va_end(ap);
}
# define TRACE_MUX(args) trace_mux args
#else
# define TRACE_MUX(args) /* nothing */
#endif
/*
* Fletcher's 16-bit checksum, using 32-bit two's-complement arithmetic.
*/
#define FOLD_ONES_COMPLEMENT_CARRY(X) ((X) = ((X) & 0xffff) + ((X) >> 16))
#define ONES_COMPLEMENT_ACCUMULATE(X,Y) (X) += (Y); if ((X) & 0x80000000) \
FOLD_ONES_COMPLEMENT_CARRY(X)
#define FLETCHER_ACCUMULATE(A,B,U) ONES_COMPLEMENT_ACCUMULATE(A, U); \
ONES_COMPLEMENT_ACCUMULATE(B, A)
PR_IMPLEMENT(PRUint32)
NS_AccumulateFastLoadChecksum(PRUint32 *aChecksum,
const PRUint8* aBuffer,
PRUint32 aLength,
PRBool aLastBuffer)
{
PRUint32 C = *aChecksum;
PRUint32 A = C & 0xffff;
PRUint32 B = C >> 16;
PRUint16 U = 0;
if (aLength >= 4) {
PRBool odd = PRWord(aBuffer) & 1;
switch (PRWord(aBuffer) & 3) {
case 3:
U = (aBuffer[0] << 8) | aBuffer[1];
FLETCHER_ACCUMULATE(A, B, U);
U = aBuffer[2];
aBuffer += 3;
aLength -= 3;
break;
case 2:
U = (aBuffer[0] << 8) | aBuffer[1];
FLETCHER_ACCUMULATE(A, B, U);
U = 0;
aBuffer += 2;
aLength -= 2;
break;
case 1:
U = *aBuffer++;
aLength--;
break;
}
PRUint32 W;
if (odd) {
while (aLength > 3) {
W = *NS_REINTERPRET_CAST(const PRUint32*, aBuffer);
U <<= 8;
#ifdef IS_BIG_ENDIAN
U |= W >> 24;
FLETCHER_ACCUMULATE(A, B, U);
U = PRUint16(W >> 8);
FLETCHER_ACCUMULATE(A, B, U);
U = W & 0xff;
#else
U |= W & 0xff;
FLETCHER_ACCUMULATE(A, B, U);
U = PRUint16(W >> 8);
U = NS_SWAP16(U);
FLETCHER_ACCUMULATE(A, B, U);
U = W >> 24;
#endif
aBuffer += 4;
aLength -= 4;
}
aBuffer--; // we're odd, we didn't checksum the last byte
aLength++;
} else {
while (aLength > 3) {
W = *NS_REINTERPRET_CAST(const PRUint32*, aBuffer);
#ifdef IS_BIG_ENDIAN
U = W >> 16;
FLETCHER_ACCUMULATE(A, B, U);
U = PRUint16(W);
FLETCHER_ACCUMULATE(A, B, U);
#else
U = NS_SWAP16(W);
FLETCHER_ACCUMULATE(A, B, U);
U = W >> 16;
U = NS_SWAP16(W);
FLETCHER_ACCUMULATE(A, B, U);
#endif
aBuffer += 4;
aLength -= 4;
}
}
}
if (aLastBuffer) {
NS_ASSERTION(aLength <= 4, "aLength botch");
switch (aLength) {
case 4:
U = (aBuffer[0] << 8) | aBuffer[1];
FLETCHER_ACCUMULATE(A, B, U);
U = (aBuffer[2] << 8) | aBuffer[3];
FLETCHER_ACCUMULATE(A, B, U);
break;
case 3:
U = (aBuffer[0] << 8) | aBuffer[1];
FLETCHER_ACCUMULATE(A, B, U);
U = aBuffer[2];
FLETCHER_ACCUMULATE(A, B, U);
break;
case 2:
U = (aBuffer[0] << 8) | aBuffer[1];
FLETCHER_ACCUMULATE(A, B, U);
break;
case 1:
U = aBuffer[0];
FLETCHER_ACCUMULATE(A, B, U);
break;
}
aLength = 0;
}
while (A >> 16)
FOLD_ONES_COMPLEMENT_CARRY(A);
while (B >> 16)
FOLD_ONES_COMPLEMENT_CARRY(B);
*aChecksum = (B << 16) | A;
return aLength;
}
PR_IMPLEMENT(PRUint32)
NS_AddFastLoadChecksums(PRUint32 sum1, PRUint32 sum2, PRUint32 sum2ByteCount)
{
PRUint32 A1 = sum1 & 0xffff;
PRUint32 B1 = sum1 >> 16;
PRUint32 A2 = sum2 & 0xffff;
PRUint32 B2 = sum2 >> 16;
PRUint32 A = A1 + A2;
while (A >> 16)
FOLD_ONES_COMPLEMENT_CARRY(A);
PRUint32 B = B2;
for (PRUint32 n = (sum2ByteCount + 1) / 2; n != 0; n--)
ONES_COMPLEMENT_ACCUMULATE(B, B1);
while (B >> 16)
FOLD_ONES_COMPLEMENT_CARRY(B);
return (B << 16) | A;
}
#undef FOLD_ONES_COMPLEMENT_CARRY
#undef ONES_COMPLEMENT_ACCUMULATE
#undef FLETCHER_ACCUMULATE
static const char magic[] = MFL_FILE_MAGIC;
// -------------------------- nsFastLoadFileReader --------------------------
nsID nsFastLoadFileReader::nsFastLoadFooter::gDummyID;
nsFastLoadFileReader::nsObjectMapEntry nsFastLoadFileReader::nsFastLoadFooter::gDummySharpObjectEntry;
NS_IMPL_ISUPPORTS_INHERITED3(nsFastLoadFileReader,
nsBinaryInputStream,
nsIObjectInputStream,
nsIFastLoadFileControl,
nsISeekableStream)
MOZ_DECL_CTOR_COUNTER(nsFastLoadFileReader)
nsresult
nsFastLoadFileReader::ReadHeader(nsFastLoadHeader *aHeader)
{
nsresult rv;
PRUint32 bytesRead;
rv = Read(NS_REINTERPRET_CAST(char*, aHeader), sizeof *aHeader, &bytesRead);
if (NS_FAILED(rv)) return rv;
if (bytesRead != sizeof *aHeader ||
memcmp(aHeader->mMagic, magic, MFL_FILE_MAGIC_SIZE)) {
return NS_ERROR_UNEXPECTED;
}
aHeader->mChecksum = NS_SWAP32(aHeader->mChecksum);
aHeader->mVersion = NS_SWAP32(aHeader->mVersion);
aHeader->mFooterOffset = NS_SWAP32(aHeader->mFooterOffset);
aHeader->mFileSize = NS_SWAP32(aHeader->mFileSize);
return NS_OK;
}
// nsIFastLoadFileControl methods:
NS_IMETHODIMP
nsFastLoadFileReader::GetChecksum(PRUint32 *aChecksum)
{
*aChecksum = mHeader.mChecksum;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::SetChecksum(PRUint32 aChecksum)
{
mHeader.mChecksum = aChecksum;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::ComputeChecksum(PRUint32 *aResult)
{
*aResult = mHeader.mChecksum;
return NS_OK;
#if 0
PRUint32 saveChecksum = mHeader.mChecksum;
mHeader.mChecksum = 0;
NS_AccumulateFastLoadChecksum(&mHeader.mChecksum,
NS_REINTERPRET_CAST(PRUint8*, &mHeader),
sizeof mHeader,
PR_FALSE);
nsCOMPtr<nsIStreamBufferAccess>
bufferAccess(do_QueryInterface(mInputStream));
if (bufferAccess)
bufferAccess->DisableBuffering();
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
nsresult rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
sizeof mHeader);
if (NS_SUCCEEDED(rv)) {
char buf[MFL_CHECKSUM_BUFSIZE];
PRUint32 len, rem = 0;
for (;;) {
rv = mInputStream->Read(buf + rem, sizeof buf - rem, &len);
if (NS_FAILED(rv) || len == 0)
break;
len += rem;
rem = NS_AccumulateFastLoadChecksum(&mHeader.mChecksum,
NS_REINTERPRET_CAST(PRUint8*,
buf),
len,
PR_FALSE);
if (rem != 0)
memcpy(buf, buf + len - rem, rem);
}
if (rem != 0) {
NS_AccumulateFastLoadChecksum(&mHeader.mChecksum,
NS_REINTERPRET_CAST(PRUint8*, buf),
rem,
PR_TRUE);
}
}
if (bufferAccess)
bufferAccess->EnableBuffering();
*aResult = mHeader.mChecksum;
mHeader.mChecksum = saveChecksum;
return rv;
#endif
}
NS_IMETHODIMP
nsFastLoadFileReader::GetDependencies(nsICollection* *aDependencies)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
struct nsDocumentMapEntry : public PLDHashEntryHdr {
const char* mURISpec; // key, must come first
PRUint32 mInitialSegmentOffset; // offset of URI's first segment in file
};
struct nsDocumentMapReadEntry : public nsDocumentMapEntry {
PRUint32 mNextSegmentOffset; // offset of URI's next segment to read
PRUint32 mBytesLeft; // bytes remaining in current segment
PRUint32 mSaveOffset; // in case demux schedule differs from
// mux schedule
};
PR_STATIC_CALLBACK(PRBool)
docmap_MatchEntry(PLDHashTable *aTable,
const PLDHashEntryHdr *aHdr,
const void *aKey)
{
const nsDocumentMapEntry* entry =
NS_STATIC_CAST(const nsDocumentMapEntry*, aHdr);
const char* spec = NS_REINTERPRET_CAST(const char*, aKey);
return strcmp(entry->mURISpec, spec) == 0;
}
PR_STATIC_CALLBACK(void)
docmap_ClearEntry(PLDHashTable *aTable, PLDHashEntryHdr *aHdr)
{
nsDocumentMapEntry* entry = NS_STATIC_CAST(nsDocumentMapEntry*, aHdr);
nsMemory::Free((void*) entry->mURISpec);
PL_DHashClearEntryStub(aTable, aHdr);
}
static PLDHashTableOps docmap_DHashTableOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashGetKeyStub,
PL_DHashStringKey,
docmap_MatchEntry,
PL_DHashMoveEntryStub,
docmap_ClearEntry,
PL_DHashFinalizeStub,
NULL
};
// An nsObjectMapEntry holds a strong reference to an XPCOM object, unless the
// mObject member, when cast to NSFastLoadOID, has its MFL_OBJECT_DEF_TAG bit
// set. NB: we rely on the fact that an nsISupports* is never an odd pointer.
struct nsObjectMapEntry : public PLDHashEntryHdr {
nsISupports* mObject; // key, must come first
};
// Fast mapping from URI object pointer back to spec-indexed document info.
struct nsURIMapReadEntry : public nsObjectMapEntry {
nsDocumentMapReadEntry* mDocMapEntry;
};
PR_STATIC_CALLBACK(void)
objmap_ClearEntry(PLDHashTable *aTable, PLDHashEntryHdr *aHdr)
{
nsObjectMapEntry* entry = NS_STATIC_CAST(nsObjectMapEntry*, aHdr);
// Ignore tagged object ids stored as object pointer keys (the updater
// code does this).
if ((NSFastLoadOID(entry->mObject) & MFL_OBJECT_DEF_TAG) == 0)
NS_IF_RELEASE(entry->mObject);
PL_DHashClearEntryStub(aTable, aHdr);
}
static PLDHashTableOps objmap_DHashTableOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashGetKeyStub,
PL_DHashVoidPtrKeyStub,
PL_DHashMatchEntryStub,
PL_DHashMoveEntryStub,
objmap_ClearEntry,
PL_DHashFinalizeStub,
NULL
};
NS_IMETHODIMP
nsFastLoadFileReader::StartMuxedDocument(nsISupports* aURI, const char* aURISpec)
{
nsDocumentMapReadEntry* docMapEntry =
NS_STATIC_CAST(nsDocumentMapReadEntry*,
PL_DHashTableOperate(&mFooter.mDocumentMap, aURISpec,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_FREE(docMapEntry))
return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
nsURIMapReadEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapReadEntry*,
PL_DHashTableOperate(&mFooter.mURIMap, key,
PL_DHASH_ADD));
if (!uriMapEntry)
return NS_ERROR_OUT_OF_MEMORY;
NS_ASSERTION(uriMapEntry->mDocMapEntry == nsnull,
"URI mapped to two different specs?");
if (uriMapEntry->mDocMapEntry)
return NS_ERROR_UNEXPECTED;
uriMapEntry->mObject = key;
NS_ADDREF(uriMapEntry->mObject);
uriMapEntry->mDocMapEntry = docMapEntry;
TRACE_MUX(('r', "start %p (%p) %s\n", aURI, key.get(), aURISpec));
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::SelectMuxedDocument(nsISupports* aURI)
{
nsresult rv;
// Find the given URI's entry and select it for more reading.
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
nsURIMapReadEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapReadEntry*,
PL_DHashTableOperate(&mFooter.mURIMap, key,
PL_DHASH_LOOKUP));
// If the URI isn't in the map, return NS_ERROR_NOT_AVAILABLE so the
// FastLoad service can try for a file update.
if (PL_DHASH_ENTRY_IS_FREE(uriMapEntry))
return NS_ERROR_NOT_AVAILABLE;
// If we're interrupting another document's segment, save its offset so
// we can seek back when it's reselected.
nsDocumentMapReadEntry* docMapEntry = mCurrentDocumentMapEntry;
if (docMapEntry && docMapEntry->mBytesLeft) {
rv = Tell(&docMapEntry->mSaveOffset);
if (NS_FAILED(rv)) return rv;
}
// It turns out we get a fair amount of redundant select calls, thanks to
// non-blocking hunks of data from the parser that are devoid of scripts.
// As more data gets FastLoaded, the number of these useless selects will
// decline.
docMapEntry = uriMapEntry->mDocMapEntry;
if (docMapEntry == mCurrentDocumentMapEntry) {
TRACE_MUX(('r', "select prev %s same as current!\n",
docMapEntry->mURISpec));
}
// Invariant: docMapEntry->mBytesLeft implies docMapEntry->mSaveOffset has
// been set non-zero by the Tell call above.
if (docMapEntry->mBytesLeft) {
NS_ASSERTION(docMapEntry->mSaveOffset != 0,
"reselecting from multiplex at unsaved offset?");
// Don't call our Seek wrapper, as it clears mCurrentDocumentMapEntry.
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
docMapEntry->mSaveOffset);
if (NS_FAILED(rv)) return rv;
}
mCurrentDocumentMapEntry = docMapEntry;
#ifdef DEBUG_MUX
PRUint32 currentSegmentOffset;
Tell(&currentSegmentOffset);
trace_mux('r', "select %p (%p) offset %lu\n",
aURI, key.get(), currentSegmentOffset);
#endif
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::EndMuxedDocument(nsISupports* aURI)
{
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
nsURIMapReadEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapReadEntry*,
PL_DHashTableOperate(&mFooter.mURIMap, key,
PL_DHASH_LOOKUP));
// If the URI isn't in the map, return NS_ERROR_NOT_AVAILABLE so the
// FastLoad service can try for a file update.
if (PL_DHASH_ENTRY_IS_FREE(uriMapEntry))
return NS_ERROR_NOT_AVAILABLE;
// Shrink the table if half the entries are removed sentinels.
PRUint32 size = PR_BIT(mFooter.mURIMap.sizeLog2);
if (mFooter.mURIMap.removedCount >= (size >> 2))
PL_DHashTableOperate(&mFooter.mURIMap, key, PL_DHASH_REMOVE);
else
PL_DHashTableRawRemove(&mFooter.mURIMap, uriMapEntry);
TRACE_MUX(('r', "end %p (%p)\n", aURI, key.get()));
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::Read(char* aBuffer, PRUint32 aCount, PRUint32 *aBytesRead)
{
nsresult rv;
nsDocumentMapReadEntry* entry = mCurrentDocumentMapEntry;
if (entry && entry->mBytesLeft == 0) {
// Don't call our Seek wrapper, as it clears mCurrentDocumentMapEntry.
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
// Loop to handle empty segments, which may be generated by the
// writer, given Start A; Start B; Select A; Select B; write B data;
// multiplexing schedules, which do tend to occur given non-blocking
// i/o with LIFO scheduling. XXXbe investigate LIFO issues
do {
// Check for unexpected end of multiplexed stream.
NS_ASSERTION(entry->mNextSegmentOffset != 0,
"document demuxed from FastLoad file more than once?");
if (entry->mNextSegmentOffset == 0)
return NS_ERROR_UNEXPECTED;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
entry->mNextSegmentOffset);
if (NS_FAILED(rv)) return rv;
// Clear mCurrentDocumentMapEntry temporarily to avoid recursion.
mCurrentDocumentMapEntry = nsnull;
rv = Read32(&entry->mNextSegmentOffset);
if (NS_SUCCEEDED(rv))
rv = Read32(&entry->mBytesLeft);
mCurrentDocumentMapEntry = entry;
if (NS_FAILED(rv)) return rv;
NS_ASSERTION(entry->mBytesLeft >= 8, "demux segment length botch!");
entry->mBytesLeft -= 8;
} while (entry->mBytesLeft == 0);
}
rv = mInputStream->Read(aBuffer, aCount, aBytesRead);
if (NS_SUCCEEDED(rv) && entry) {
NS_ASSERTION(entry->mBytesLeft >= *aBytesRead, "demux underflow!");
entry->mBytesLeft -= *aBytesRead;
#ifdef NS_DEBUG
// Invariant: !entry->mBytesLeft implies entry->mSaveOffset == 0.
if (entry->mBytesLeft == 0)
entry->mSaveOffset = 0;
#endif
}
return rv;
}
nsresult
nsFastLoadFileReader::ReadFooter(nsFastLoadFooter *aFooter)
{
nsresult rv;
rv = ReadFooterPrefix(aFooter);
if (NS_FAILED(rv)) return rv;
aFooter->mIDMap = new nsID[aFooter->mNumIDs];
if (!aFooter->mIDMap)
return NS_ERROR_OUT_OF_MEMORY;
PRUint32 i, n;
for (i = 0, n = aFooter->mNumIDs; i < n; i++) {
rv = ReadSlowID(&aFooter->mIDMap[i]);
if (NS_FAILED(rv)) return rv;
}
aFooter->mObjectMap = new nsObjectMapEntry[aFooter->mNumSharpObjects];
if (!aFooter->mObjectMap)
return NS_ERROR_OUT_OF_MEMORY;
for (i = 0, n = aFooter->mNumSharpObjects; i < n; i++) {
nsObjectMapEntry* entry = &aFooter->mObjectMap[i];
rv = ReadSharpObjectInfo(entry);
if (NS_FAILED(rv)) return rv;
entry->mReadObject = nsnull;
entry->mSkipOffset = 0;
}
if (!PL_DHashTableInit(&aFooter->mDocumentMap, &docmap_DHashTableOps,
(void *)this, sizeof(nsDocumentMapReadEntry),
PL_DHASH_MIN_SIZE)) {
aFooter->mDocumentMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
if (!PL_DHashTableInit(&aFooter->mURIMap, &objmap_DHashTableOps,
(void *)this, sizeof(nsURIMapReadEntry),
PL_DHASH_MIN_SIZE)) {
aFooter->mURIMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
for (i = 0, n = aFooter->mNumMuxedDocuments; i < n; i++) {
nsFastLoadMuxedDocumentInfo info;
rv = ReadMuxedDocumentInfo(&info);
if (NS_FAILED(rv)) return rv;
nsDocumentMapReadEntry* entry =
NS_STATIC_CAST(nsDocumentMapReadEntry*,
PL_DHashTableOperate(&aFooter->mDocumentMap,
info.mURISpec,
PL_DHASH_ADD));
if (!entry) {
nsMemory::Free((void*) info.mURISpec);
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ASSERTION(!entry->mURISpec, "duplicate URISpec in MuxedDocumentMap");
entry->mURISpec = info.mURISpec;
entry->mInitialSegmentOffset = info.mInitialSegmentOffset;
entry->mNextSegmentOffset = info.mInitialSegmentOffset;
entry->mBytesLeft = 0;
entry->mSaveOffset = 0;
}
for (i = 0, n = aFooter->mNumDependencies; i < n; i++) {
char* s;
rv = ReadStringZ(&s);
if (NS_FAILED(rv)) return rv;
if (!aFooter->AppendDependency(s, PR_FALSE)) {
nsMemory::Free(s);
return NS_ERROR_OUT_OF_MEMORY;
}
}
return NS_OK;
}
nsresult
nsFastLoadFileReader::ReadFooterPrefix(nsFastLoadFooterPrefix *aFooterPrefix)
{
nsresult rv;
rv = Read32(&aFooterPrefix->mNumIDs);
if (NS_FAILED(rv)) return rv;
rv = Read32(&aFooterPrefix->mNumSharpObjects);
if (NS_FAILED(rv)) return rv;
rv = Read32(&aFooterPrefix->mNumMuxedDocuments);
if (NS_FAILED(rv)) return rv;
rv = Read32(&aFooterPrefix->mNumDependencies);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult
nsFastLoadFileReader::ReadSlowID(nsID *aID)
{
nsresult rv;
rv = Read32(&aID->m0);
if (NS_FAILED(rv)) return rv;
rv = Read16(&aID->m1);
if (NS_FAILED(rv)) return rv;
rv = Read16(&aID->m2);
if (NS_FAILED(rv)) return rv;
PRUint32 bytesRead;
rv = Read(NS_REINTERPRET_CAST(char*, aID->m3), sizeof aID->m3, &bytesRead);
if (NS_FAILED(rv)) return rv;
if (bytesRead != sizeof aID->m3)
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
nsFastLoadFileReader::ReadFastID(NSFastLoadID *aID)
{
nsresult rv = Read32(aID);
if (NS_SUCCEEDED(rv))
*aID ^= MFL_ID_XOR_KEY;
return rv;
}
nsresult
nsFastLoadFileReader::ReadSharpObjectInfo(nsFastLoadSharpObjectInfo *aInfo)
{
nsresult rv;
rv = Read32(&aInfo->mCIDOffset);
if (NS_FAILED(rv)) return rv;
rv = Read16(&aInfo->mStrongRefCnt);
if (NS_FAILED(rv)) return rv;
rv = Read16(&aInfo->mWeakRefCnt);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult
nsFastLoadFileReader::ReadMuxedDocumentInfo(nsFastLoadMuxedDocumentInfo *aInfo)
{
nsresult rv;
char *spec;
rv = ReadStringZ(&spec);
if (NS_FAILED(rv)) return rv;
rv = Read32(&aInfo->mInitialSegmentOffset);
if (NS_FAILED(rv)) {
nsMemory::Free((void*) spec);
return rv;
}
aInfo->mURISpec = spec;
return NS_OK;
}
nsresult
nsFastLoadFileReader::Open()
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
if (!seekable)
return NS_ERROR_UNEXPECTED;
nsresult rv;
// Don't bother buffering the header, as we immediately seek to EOF.
nsCOMPtr<nsIStreamBufferAccess>
bufferAccess(do_QueryInterface(mInputStream));
if (bufferAccess)
bufferAccess->DisableBuffering();
rv = ReadHeader(&mHeader);
if (bufferAccess)
bufferAccess->EnableBuffering();
if (NS_FAILED(rv)) return rv;
if (mHeader.mVersion != MFL_FILE_VERSION)
return NS_ERROR_UNEXPECTED;
if (mHeader.mFooterOffset == 0)
return NS_ERROR_UNEXPECTED;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
if (NS_FAILED(rv)) return rv;
PRUint32 fileSize;
rv = seekable->Tell(&fileSize);
if (NS_FAILED(rv)) return rv;
if (fileSize != mHeader.mFileSize)
return NS_ERROR_UNEXPECTED;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
PRInt32(mHeader.mFooterOffset));
if (NS_FAILED(rv)) return rv;
rv = ReadFooter(&mFooter);
if (NS_FAILED(rv)) return rv;
return seekable->Seek(nsISeekableStream::NS_SEEK_SET,
sizeof(nsFastLoadHeader));
}
NS_IMETHODIMP
nsFastLoadFileReader::Close()
{
#ifdef DEBUG_brendan
PRUint32 strongTotal = 0, weakTotal = 0;
#endif
// Give up our strong "keepalive" references, in case not all objects that
// were deserialized were fully re-connected. This happens for sure when
// nsFastLoadFileUpdater has to deserialize sharp objects from its aReader
// constructor parameter in order to map object info by object address, in
// order to write a valid file footer when the update process completes.
//
// XXXbe get rid of strongTotal, weakTotal, and the warnings
for (PRUint32 i = 0, n = mFooter.mNumSharpObjects; i < n; i++) {
nsObjectMapEntry* entry = &mFooter.mObjectMap[i];
#ifdef DEBUG_brendan
strongTotal += entry->mStrongRefCnt;
weakTotal += entry->mWeakRefCnt;
#endif
entry->mReadObject = nsnull;
}
#ifdef DEBUG_brendan
if (strongTotal != 0)
NS_WARNING("failed to deserialize all strong refs from FastLoad file");
if (weakTotal != 0)
NS_WARNING("failed to deserialize all weak refs from FastLoad file");
#endif
return mInputStream->Close();
}
nsresult
nsFastLoadFileReader::DeserializeObject(nsISupports* *aObject)
{
nsresult rv;
NSFastLoadID fastCID;
rv = ReadFastID(&fastCID);
if (NS_FAILED(rv)) return rv;
const nsID& slowCID = mFooter.GetID(fastCID);
nsCOMPtr<nsISupports> object(do_CreateInstance(slowCID, &rv));
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsISerializable> serializable(do_QueryInterface(object));
if (!serializable)
return NS_ERROR_FAILURE;
rv = serializable->Read(this);
if (NS_FAILED(rv)) return rv;
*aObject = object;
NS_ADDREF(*aObject);
return NS_OK;
}
nsresult
nsFastLoadFileReader::ReadObject(PRBool aIsStrongRef, nsISupports* *aObject)
{
nsresult rv;
NSFastLoadOID oid;
rv = Read32(&oid);
if (NS_FAILED(rv)) return rv;
oid ^= MFL_OID_XOR_KEY;
nsObjectMapEntry* entry = (oid != MFL_DULL_OBJECT_OID)
? &mFooter.GetSharpObjectEntry(oid)
: nsnull;
nsCOMPtr<nsISupports> object;
if (!entry) {
// A very dull object, defined at point of single (strong) reference.
NS_ASSERTION(aIsStrongRef, "dull object read via weak ref!");
rv = DeserializeObject(getter_AddRefs(object));
if (NS_FAILED(rv)) return rv;
} else {
NS_ASSERTION((oid & MFL_WEAK_REF_TAG) ==
(aIsStrongRef ? 0 : MFL_WEAK_REF_TAG),
"strong vs. weak ref deserialization mismatch!");
// Check whether we've already deserialized the object for this OID.
object = entry->mReadObject;
if (!object) {
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
PRUint32 saveOffset;
nsDocumentMapReadEntry* saveDocMapEntry = nsnull;
rv = seekable->Tell(&saveOffset);
if (NS_FAILED(rv)) return rv;
if (entry->mCIDOffset != saveOffset) {
// We skipped deserialization of this object from its position
// earlier in the input stream, presumably due to the reference
// there being an nsFastLoadPtr or some such thing. Seek back
// and read it now.
NS_ASSERTION(entry->mCIDOffset < saveOffset,
"out of order object?!");
// Ape our Seek wrapper by clearing mCurrentDocumentMapEntry.
// This allows for a skipped object to be referenced from two
// or more multiplexed documents in the FastLoad file.
saveDocMapEntry = mCurrentDocumentMapEntry;
mCurrentDocumentMapEntry = nsnull;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
entry->mCIDOffset);
if (NS_FAILED(rv)) return rv;
}
rv = DeserializeObject(getter_AddRefs(object));
if (NS_FAILED(rv)) return rv;
if (entry->mCIDOffset != saveOffset) {
// Save the "skip offset" in case we need to skip this object
// definition when reading forward, later on.
rv = seekable->Tell(&entry->mSkipOffset);
if (NS_FAILED(rv)) return rv;
// Restore stream offset and mCurrentDocumentMapEntry in case
// we're still reading forward through a part of the multiplex
// to get object definitions eagerly.
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, saveOffset);
if (NS_FAILED(rv)) return rv;
mCurrentDocumentMapEntry = saveDocMapEntry;
}
// Save object until all refs have been deserialized.
entry->mReadObject = object;
} else {
// What if we are at a definition that's already been read? This
// case arises when a sharp object's def is serialized before its
// refs, while a non-defining ref is deserialized before the def.
// We must skip over the object definition.
if (oid & MFL_OBJECT_DEF_TAG) {
NS_ASSERTION(entry->mSkipOffset != 0, "impossible! see above");
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
entry->mSkipOffset);
if (NS_FAILED(rv)) return rv;
}
}
if (aIsStrongRef) {
NS_ASSERTION(entry->mStrongRefCnt != 0, "mStrongRefCnt underflow!");
entry->mStrongRefCnt--;
} else {
NS_ASSERTION(entry->mWeakRefCnt != 0, "mWeakRefCnt underflow!");
entry->mWeakRefCnt--;
}
if (entry->mStrongRefCnt == 0 && entry->mWeakRefCnt == 0)
entry->mReadObject = nsnull;
}
if (oid & MFL_QUERY_INTERFACE_TAG) {
NSFastLoadID iid;
rv = ReadFastID(&iid);
if (NS_FAILED(rv)) return rv;
rv = object->QueryInterface(mFooter.GetID(iid),
NS_REINTERPRET_CAST(void**, aObject));
if (NS_FAILED(rv)) return rv;
} else {
*aObject = object;
NS_ADDREF(*aObject);
}
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::ReadID(nsID *aResult)
{
nsresult rv;
NSFastLoadID fastID;
rv = ReadFastID(&fastID);
if (NS_FAILED(rv)) return rv;
*aResult = mFooter.GetID(fastID);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileReader::Seek(PRInt32 aWhence, PRInt32 aOffset)
{
mCurrentDocumentMapEntry = nsnull;
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
return seekable->Seek(aWhence, aOffset);
}
NS_IMETHODIMP
nsFastLoadFileReader::Tell(PRUint32 *aResult)
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
return seekable->Tell(aResult);
}
NS_IMETHODIMP
nsFastLoadFileReader::SetEOF()
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
return seekable->SetEOF();
}
NS_COM nsresult
NS_NewFastLoadFileReader(nsIObjectInputStream* *aResult,
nsIInputStream* aSrcStream)
{
nsFastLoadFileReader* reader = new nsFastLoadFileReader(aSrcStream);
if (!reader)
return NS_ERROR_OUT_OF_MEMORY;
// Stabilize reader's refcnt.
nsCOMPtr<nsIObjectInputStream> stream(reader);
nsresult rv = reader->Open();
if (NS_FAILED(rv))
return rv;
*aResult = stream;
NS_ADDREF(*aResult);
return NS_OK;
}
// -------------------------- nsFastLoadFileWriter --------------------------
NS_IMPL_ISUPPORTS_INHERITED3(nsFastLoadFileWriter,
nsBinaryOutputStream,
nsIObjectOutputStream,
nsIFastLoadFileControl,
nsISeekableStream)
MOZ_DECL_CTOR_COUNTER(nsFastLoadFileWriter)
struct nsIDMapEntry : public PLDHashEntryHdr {
NSFastLoadID mFastID; // 1 + nsFastLoadFooter::mIDMap index
nsID mSlowID; // key, used by PLDHashTableOps below
};
PR_STATIC_CALLBACK(const void *)
idmap_GetKey(PLDHashTable *aTable, PLDHashEntryHdr *aHdr)
{
nsIDMapEntry* entry = NS_STATIC_CAST(nsIDMapEntry*, aHdr);
return &entry->mSlowID;
}
PR_STATIC_CALLBACK(PLDHashNumber)
idmap_HashKey(PLDHashTable *aTable, const void *aKey)
{
const nsID *idp = NS_REINTERPRET_CAST(const nsID*, aKey);
return idp->m0;
}
PR_STATIC_CALLBACK(PRBool)
idmap_MatchEntry(PLDHashTable *aTable,
const PLDHashEntryHdr *aHdr,
const void *aKey)
{
const nsIDMapEntry* entry = NS_STATIC_CAST(const nsIDMapEntry*, aHdr);
const nsID *idp = NS_REINTERPRET_CAST(const nsID*, aKey);
return memcmp(&entry->mSlowID, idp, sizeof(nsID)) == 0;
}
static PLDHashTableOps idmap_DHashTableOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
idmap_GetKey,
idmap_HashKey,
idmap_MatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
NULL
};
nsresult
nsFastLoadFileWriter::MapID(const nsID& aSlowID, NSFastLoadID *aResult)
{
nsIDMapEntry* entry =
NS_STATIC_CAST(nsIDMapEntry*,
PL_DHashTableOperate(&mIDMap, &aSlowID, PL_DHASH_ADD));
if (!entry)
return NS_ERROR_OUT_OF_MEMORY;
if (entry->mFastID == 0) {
entry->mFastID = mIDMap.entryCount;
entry->mSlowID = aSlowID;
}
*aResult = entry->mFastID;
return NS_OK;
}
nsresult
nsFastLoadFileWriter::WriteHeader(nsFastLoadHeader *aHeader)
{
nsresult rv;
PRUint32 bytesWritten;
rv = Write(aHeader->mMagic, MFL_FILE_MAGIC_SIZE, &bytesWritten);
if (NS_FAILED(rv)) return rv;
if (bytesWritten != MFL_FILE_MAGIC_SIZE)
return NS_ERROR_FAILURE;
rv = Write32(aHeader->mChecksum);
if (NS_FAILED(rv)) return rv;
rv = Write32(aHeader->mVersion);
if (NS_FAILED(rv)) return rv;
rv = Write32(aHeader->mFooterOffset);
if (NS_FAILED(rv)) return rv;
rv = Write32(aHeader->mFileSize);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
// nsIFastLoadFileControl methods:
NS_IMETHODIMP
nsFastLoadFileWriter::GetChecksum(PRUint32 *aChecksum)
{
if (mHeader.mChecksum == 0)
return NS_ERROR_NOT_AVAILABLE;
*aChecksum = mHeader.mChecksum;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::SetChecksum(PRUint32 aChecksum)
{
mHeader.mChecksum = aChecksum;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::ComputeChecksum(PRUint32 *aResult)
{
return GetChecksum(aResult);
}
NS_IMETHODIMP
nsFastLoadFileWriter::GetDependencies(nsICollection* *aDependencies)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
struct nsDocumentMapWriteEntry : public nsDocumentMapEntry {
PRUint32 mCurrentSegmentOffset; // last written segment's offset
};
// Fast mapping from URI object pointer back to spec-indexed document info.
struct nsURIMapWriteEntry : public nsObjectMapEntry {
nsDocumentMapWriteEntry* mDocMapEntry;
};
NS_IMETHODIMP
nsFastLoadFileWriter::StartMuxedDocument(nsISupports* aURI,
const char* aURISpec)
{
// Save mDocumentMap table generation and mCurrentDocumentMapEntry key in
// case the hash table grows during the PL_DHASH_ADD operation.
PRUint32 saveGeneration = 0;
const char* saveURISpec = nsnull;
if (mCurrentDocumentMapEntry) {
saveGeneration = mDocumentMap.generation;
saveURISpec = mCurrentDocumentMapEntry->mURISpec;
}
nsDocumentMapWriteEntry* docMapEntry =
NS_STATIC_CAST(nsDocumentMapWriteEntry*,
PL_DHashTableOperate(&mDocumentMap, aURISpec,
PL_DHASH_ADD));
if (!docMapEntry)
return NS_ERROR_OUT_OF_MEMORY;
// If the generation number changed, refresh mCurrentDocumentMapEntry.
if (mCurrentDocumentMapEntry && mDocumentMap.generation != saveGeneration) {
mCurrentDocumentMapEntry =
NS_STATIC_CAST(nsDocumentMapWriteEntry*,
PL_DHashTableOperate(&mDocumentMap, saveURISpec,
PL_DHASH_LOOKUP));
NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(mCurrentDocumentMapEntry),
"mCurrentDocumentMapEntry lost during table growth?!");
}
NS_ASSERTION(docMapEntry->mURISpec == nsnull,
"redundant multiplexed document?");
if (docMapEntry->mURISpec)
return NS_ERROR_UNEXPECTED;
void* spec = nsMemory::Clone(aURISpec, strlen(aURISpec) + 1);
if (!spec)
return NS_ERROR_OUT_OF_MEMORY;
docMapEntry->mURISpec = NS_REINTERPRET_CAST(const char*, spec);
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
nsURIMapWriteEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapWriteEntry*,
PL_DHashTableOperate(&mURIMap, key, PL_DHASH_ADD));
if (!uriMapEntry)
return NS_ERROR_OUT_OF_MEMORY;
NS_ASSERTION(uriMapEntry->mDocMapEntry == nsnull,
"URI mapped to two different specs?");
if (uriMapEntry->mDocMapEntry)
return NS_ERROR_UNEXPECTED;
uriMapEntry->mObject = key;
NS_ADDREF(uriMapEntry->mObject);
uriMapEntry->mDocMapEntry = docMapEntry;
TRACE_MUX(('w', "start %p (%p) %s\n", aURI, key.get(), aURISpec));
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::SelectMuxedDocument(nsISupports* aURI)
{
// Avoid repeatedly QI'ing to nsISeekableStream as we tell and seek.
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
// Capture the current file offset (XXXbe maintain our own via Write?)
nsresult rv;
PRUint32 currentSegmentOffset;
rv = seekable->Tell(&currentSegmentOffset);
if (NS_FAILED(rv)) return rv;
// Look for an existing entry keyed by aURI, added by StartMuxedDocument.
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
nsURIMapWriteEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapWriteEntry*,
PL_DHashTableOperate(&mURIMap, key, PL_DHASH_LOOKUP));
NS_ASSERTION(PL_DHASH_ENTRY_IS_BUSY(uriMapEntry),
"SelectMuxedDocument without prior StartMuxedDocument?");
if (PL_DHASH_ENTRY_IS_FREE(uriMapEntry))
return NS_ERROR_UNEXPECTED;
nsDocumentMapWriteEntry* docMapEntry = uriMapEntry->mDocMapEntry;
// If there is a muxed document segment open, close it now by setting its
// length, stored in the second PRUint32 of the segment.
nsDocumentMapWriteEntry* prevDocMapEntry = mCurrentDocumentMapEntry;
if (prevDocMapEntry) {
if (prevDocMapEntry == docMapEntry) {
TRACE_MUX(('w', "select prev %s same as current!\n",
prevDocMapEntry->mURISpec));
return NS_OK;
}
PRUint32 prevSegmentOffset = prevDocMapEntry->mCurrentSegmentOffset;
TRACE_MUX(('w', "select prev %s offset %lu\n",
prevDocMapEntry->mURISpec, prevSegmentOffset));
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
prevSegmentOffset + 4);
if (NS_FAILED(rv)) return rv;
// The length counts all bytes in the segment, including the header
// that contains [nextSegmentOffset, length].
rv = Write32(currentSegmentOffset - prevSegmentOffset);
if (NS_FAILED(rv)) return rv;
// Seek back to the current offset only if we are not going to seek
// back to *this* entry's last "current" segment offset and write its
// next segment offset at the first PRUint32 of the segment.
if (!docMapEntry->mInitialSegmentOffset) {
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
currentSegmentOffset);
if (NS_FAILED(rv)) return rv;
}
}
// If this entry was newly added, set its key and initial segment offset.
// Otherwise, seek back to write the next segment offset of the previous
// segment for this document in the multiplex.
if (!docMapEntry->mInitialSegmentOffset) {
docMapEntry->mInitialSegmentOffset = currentSegmentOffset;
} else {
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
docMapEntry->mCurrentSegmentOffset);
if (NS_FAILED(rv)) return rv;
rv = Write32(currentSegmentOffset);
if (NS_FAILED(rv)) return rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
currentSegmentOffset);
if (NS_FAILED(rv)) return rv;
}
// Update this document's current segment offset so we can later fix its
// next segment offset (unless it is last, in which case we leave the zero
// placeholder as a terminator).
docMapEntry->mCurrentSegmentOffset = currentSegmentOffset;
rv = Write32(0); // nextSegmentOffset placeholder
if (NS_FAILED(rv)) return rv;
rv = Write32(0); // length placeholder
if (NS_FAILED(rv)) return rv;
mCurrentDocumentMapEntry = docMapEntry;
TRACE_MUX(('w', "select %p (%p) offset %lu\n",
aURI, key.get(), currentSegmentOffset));
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::EndMuxedDocument(nsISupports* aURI)
{
nsCOMPtr<nsISupports> key(do_QueryInterface(aURI));
#ifdef NS_DEBUG
nsURIMapWriteEntry* uriMapEntry =
NS_STATIC_CAST(nsURIMapWriteEntry*,
PL_DHashTableOperate(&mURIMap, key, PL_DHASH_LOOKUP));
NS_ASSERTION(uriMapEntry && uriMapEntry->mDocMapEntry,
"unknown aURI passed to EndMuxedDocument!");
#endif
PL_DHashTableOperate(&mURIMap, key, PL_DHASH_REMOVE);
TRACE_MUX(('w', "end %p (%p)\n", aURI, key.get()));
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::Write(const char* aBuffer, PRUint32 aCount,
PRUint32 *aBytesWritten)
{
nsresult rv;
rv = mOutputStream->Write(aBuffer, aCount, aBytesWritten);
if (NS_SUCCEEDED(rv)) {
PRUint32 bytesToCheck = *aBytesWritten;
while (bytesToCheck != 0) {
PRUint32 bytesThatFit = bytesToCheck;
PRUint32 nextCursor = mChecksumCursor + bytesThatFit;
PRInt32 didntFit = PRInt32(nextCursor - MFL_CHECKSUM_BUFSIZE);
if (didntFit > 0)
bytesThatFit -= didntFit;
memcpy(mChecksumBuffer + mChecksumCursor, aBuffer, bytesThatFit);
mChecksumCursor += bytesThatFit;
if (mChecksumCursor == MFL_CHECKSUM_BUFSIZE) {
nextCursor =
NS_AccumulateFastLoadChecksum(&mHeader.mChecksum,
mChecksumBuffer,
MFL_CHECKSUM_BUFSIZE,
PR_FALSE);
mCheckedByteCount += MFL_CHECKSUM_BUFSIZE - nextCursor;
NS_ASSERTION(nextCursor == 0, "odd mChecksumBuffer alignment?");
if (nextCursor != 0) {
memcpy(mChecksumBuffer,
mChecksumBuffer + MFL_CHECKSUM_BUFSIZE - nextCursor,
nextCursor);
}
}
mChecksumCursor = nextCursor;
bytesToCheck -= bytesThatFit;
}
}
return rv;
}
nsresult
nsFastLoadFileWriter::WriteFooterPrefix(const nsFastLoadFooterPrefix& aFooterPrefix)
{
nsresult rv;
rv = Write32(aFooterPrefix.mNumIDs);
if (NS_FAILED(rv)) return rv;
rv = Write32(aFooterPrefix.mNumSharpObjects);
if (NS_FAILED(rv)) return rv;
rv = Write32(aFooterPrefix.mNumMuxedDocuments);
if (NS_FAILED(rv)) return rv;
rv = Write32(aFooterPrefix.mNumDependencies);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult
nsFastLoadFileWriter::WriteSlowID(const nsID& aID)
{
nsresult rv;
rv = Write32(aID.m0);
if (NS_FAILED(rv)) return rv;
rv = Write16(aID.m1);
if (NS_FAILED(rv)) return rv;
rv = Write16(aID.m2);
if (NS_FAILED(rv)) return rv;
PRUint32 bytesWritten;
rv = Write(NS_REINTERPRET_CAST(const char*, aID.m3), sizeof aID.m3,
&bytesWritten);
if (NS_FAILED(rv)) return rv;
if (bytesWritten != sizeof aID.m3)
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
nsFastLoadFileWriter::WriteFastID(NSFastLoadID aID)
{
return Write32(aID ^ MFL_ID_XOR_KEY);
}
nsresult
nsFastLoadFileWriter::WriteSharpObjectInfo(const nsFastLoadSharpObjectInfo& aInfo)
{
nsresult rv;
rv = Write32(aInfo.mCIDOffset);
if (NS_FAILED(rv)) return rv;
rv = Write16(aInfo.mStrongRefCnt);
if (NS_FAILED(rv)) return rv;
rv = Write16(aInfo.mWeakRefCnt);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult
nsFastLoadFileWriter::WriteMuxedDocumentInfo(const nsFastLoadMuxedDocumentInfo& aInfo)
{
nsresult rv;
rv = WriteStringZ(aInfo.mURISpec);
if (NS_FAILED(rv)) return rv;
rv = Write32(aInfo.mInitialSegmentOffset);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
PLDHashOperator PR_CALLBACK
nsFastLoadFileWriter::IDMapEnumerate(PLDHashTable *aTable,
PLDHashEntryHdr *aHdr,
PRUint32 aNumber,
void *aData)
{
nsIDMapEntry* entry = NS_STATIC_CAST(nsIDMapEntry*, aHdr);
PRUint32 index = entry->mFastID - 1;
nsID* vector = NS_REINTERPRET_CAST(nsID*, aData);
NS_ASSERTION(index < aTable->entryCount, "bad nsIDMap index!");
vector[index] = entry->mSlowID;
return PL_DHASH_NEXT;
}
struct nsSharpObjectMapEntry : public nsObjectMapEntry {
NSFastLoadOID mOID;
nsFastLoadSharpObjectInfo mInfo;
};
PLDHashOperator PR_CALLBACK
nsFastLoadFileWriter::ObjectMapEnumerate(PLDHashTable *aTable,
PLDHashEntryHdr *aHdr,
PRUint32 aNumber,
void *aData)
{
nsSharpObjectMapEntry* entry = NS_STATIC_CAST(nsSharpObjectMapEntry*, aHdr);
PRUint32 index = MFL_OID_TO_SHARP_INDEX(entry->mOID);
nsFastLoadSharpObjectInfo* vector =
NS_REINTERPRET_CAST(nsFastLoadSharpObjectInfo*, aData);
NS_ASSERTION(index < aTable->entryCount, "bad nsObjectMap index!");
vector[index] = entry->mInfo;
#ifdef NS_DEBUG
NS_ASSERTION(entry->mInfo.mStrongRefCnt, "no strong ref in serialization!");
if ((NSFastLoadOID(entry->mObject) & MFL_OBJECT_DEF_TAG) == 0) {
nsrefcnt rc = entry->mObject->AddRef();
NS_ASSERTION(entry->mInfo.mStrongRefCnt <= rc - 2,
"too many strong refs in serialization");
entry->mObject->Release();
}
#endif
// Ignore tagged object ids stored as object pointer keys (the updater
// code does this).
if ((NSFastLoadOID(entry->mObject) & MFL_OBJECT_DEF_TAG) == 0)
NS_RELEASE(entry->mObject);
return PL_DHASH_NEXT;
}
PLDHashOperator PR_CALLBACK
nsFastLoadFileWriter::DocumentMapEnumerate(PLDHashTable *aTable,
PLDHashEntryHdr *aHdr,
PRUint32 aNumber,
void *aData)
{
nsFastLoadFileWriter* writer =
NS_REINTERPRET_CAST(nsFastLoadFileWriter*, aTable->data);
nsDocumentMapWriteEntry* entry =
NS_STATIC_CAST(nsDocumentMapWriteEntry*, aHdr);
nsresult* rvp = NS_REINTERPRET_CAST(nsresult*, aData);
nsFastLoadMuxedDocumentInfo info;
info.mURISpec = entry->mURISpec;
info.mInitialSegmentOffset = entry->mInitialSegmentOffset;
*rvp = writer->WriteMuxedDocumentInfo(info);
return NS_FAILED(*rvp) ? PL_DHASH_STOP : PL_DHASH_NEXT;
}
nsresult
nsFastLoadFileWriter::WriteFooter()
{
nsresult rv;
PRUint32 i, count;
nsFastLoadFooterPrefix footerPrefix;
footerPrefix.mNumIDs = mIDMap.entryCount;
footerPrefix.mNumSharpObjects = mObjectMap.entryCount;
footerPrefix.mNumMuxedDocuments = mDocumentMap.entryCount;
footerPrefix.mNumDependencies = mDependencies.Count();
rv = WriteFooterPrefix(footerPrefix);
if (NS_FAILED(rv)) return rv;
// Enumerate mIDMap into a vector indexed by mFastID and write it.
nsID* idvec = new nsID[footerPrefix.mNumIDs];
if (!idvec)
return NS_ERROR_OUT_OF_MEMORY;
count = PL_DHashTableEnumerate(&mIDMap, IDMapEnumerate, idvec);
NS_ASSERTION(count == footerPrefix.mNumIDs, "bad mIDMap enumeration!");
for (i = 0; i < count; i++) {
rv = WriteSlowID(idvec[i]);
if (NS_FAILED(rv)) break;
}
delete[] idvec;
if (NS_FAILED(rv)) return rv;
// Enumerate mObjectMap into a vector indexed by mOID and write it.
nsFastLoadSharpObjectInfo* objvec =
new nsFastLoadSharpObjectInfo[footerPrefix.mNumSharpObjects];
if (!objvec)
return NS_ERROR_OUT_OF_MEMORY;
count = PL_DHashTableEnumerate(&mObjectMap, ObjectMapEnumerate, objvec);
NS_ASSERTION(count == footerPrefix.mNumSharpObjects,
"bad mObjectMap enumeration!");
for (i = 0; i < count; i++) {
rv = WriteSharpObjectInfo(objvec[i]);
if (NS_FAILED(rv)) break;
}
delete[] objvec;
if (NS_FAILED(rv)) return rv;
// Enumerate mDocumentMap, writing nsFastLoadMuxedDocumentInfo records
count = PL_DHashTableEnumerate(&mDocumentMap, DocumentMapEnumerate, &rv);
if (NS_FAILED(rv)) return rv;
NS_ASSERTION(count == footerPrefix.mNumMuxedDocuments,
"bad mDocumentMap enumeration!");
// Write out make-like file dependencies.
count = footerPrefix.mNumDependencies;
for (i = 0; i < count; i++) {
const char* s =
NS_REINTERPRET_CAST(const char*, mDependencies.ElementAt(PRInt32(i)));
rv = WriteStringZ(s);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
nsresult
nsFastLoadFileWriter::Init()
{
if (!PL_DHashTableInit(&mIDMap, &idmap_DHashTableOps, (void *)this,
sizeof(nsIDMapEntry), PL_DHASH_MIN_SIZE)) {
mIDMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
if (!PL_DHashTableInit(&mObjectMap, &objmap_DHashTableOps, (void *)this,
sizeof(nsSharpObjectMapEntry), PL_DHASH_MIN_SIZE)) {
mObjectMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
if (!PL_DHashTableInit(&mDocumentMap, &docmap_DHashTableOps, (void *)this,
sizeof(nsDocumentMapWriteEntry),
PL_DHASH_MIN_SIZE)) {
mDocumentMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
if (!PL_DHashTableInit(&mURIMap, &objmap_DHashTableOps, (void *)this,
sizeof(nsURIMapWriteEntry), PL_DHASH_MIN_SIZE)) {
mURIMap.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
nsresult
nsFastLoadFileWriter::Open()
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
if (!seekable)
return NS_ERROR_UNEXPECTED;
nsresult rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
sizeof(nsFastLoadHeader));
if (NS_FAILED(rv)) return rv;
return Init();
}
NS_IMETHODIMP
nsFastLoadFileWriter::Close()
{
nsresult rv;
memcpy(mHeader.mMagic, magic, MFL_FILE_MAGIC_SIZE);
mHeader.mChecksum = 0;
mHeader.mVersion = MFL_FILE_VERSION;
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
rv = seekable->Tell(&mHeader.mFooterOffset);
if (NS_FAILED(rv)) return rv;
// If there is a muxed document segment open, close it now by setting its
// length, stored in the second PRUint32 of the segment.
if (mCurrentDocumentMapEntry) {
PRUint32 currentSegmentOffset =
mCurrentDocumentMapEntry->mCurrentSegmentOffset;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
currentSegmentOffset + 4);
if (NS_FAILED(rv)) return rv;
rv = Write32(mHeader.mFooterOffset - currentSegmentOffset);
if (NS_FAILED(rv)) return rv;
// Seek back to the current offset to write the footer.
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
mHeader.mFooterOffset);
if (NS_FAILED(rv)) return rv;
mCurrentDocumentMapEntry = nsnull;
}
rv = WriteFooter();
if (NS_FAILED(rv)) return rv;
rv = seekable->Tell(&mHeader.mFileSize);
if (NS_FAILED(rv)) return rv;
/* Sum any bytes left in the checksum buffer. */
if (mChecksumCursor != 0) {
NS_AccumulateFastLoadChecksum(&mHeader.mChecksum,
mChecksumBuffer,
mChecksumCursor,
PR_TRUE);
mCheckedByteCount += mChecksumCursor;
}
PRUint32 headChecksum;
NS_AccumulateFastLoadChecksum(&headChecksum,
NS_REINTERPRET_CAST(PRUint8*, &mHeader),
sizeof mHeader,
PR_FALSE);
mHeader.mChecksum =
NS_AddFastLoadChecksums(headChecksum, mHeader.mChecksum,
mCheckedByteCount);
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, 0);
if (NS_FAILED(rv)) return rv;
rv = WriteHeader(&mHeader);
if (NS_FAILED(rv)) return rv;
return mOutputStream->Close();
}
// Psuedo-tag used as flag between WriteSingleRefObject and WriteCommon.
#define MFL_SINGLE_REF_PSEUDO_TAG PR_BIT(MFL_OBJECT_TAG_BITS)
nsresult
nsFastLoadFileWriter::WriteObjectCommon(nsISupports* aObject,
PRBool aIsStrongRef,
PRUint32 aTags)
{
nsrefcnt rc;
nsresult rv;
NS_ASSERTION((NSFastLoadOID(aObject) & MFL_OBJECT_DEF_TAG) == 0,
"odd nsISupports*, oh no!");
// Here be manual refcounting dragons!
rc = aObject->AddRef();
NS_ASSERTION(rc != 0, "bad refcnt when writing aObject!");
NSFastLoadOID oid;
if (rc == 2 && (aTags & MFL_SINGLE_REF_PSEUDO_TAG)) {
// Dull object: only one strong ref and no weak refs in serialization.
// Conservative: we don't trust the caller if there are more than two
// refs (one from the AddRef above, one from the data structure that's
// being serialized).
oid = MFL_DULL_OBJECT_OID;
aObject->Release();
} else {
// Object is presumed to be multiply connected through some combo of
// strong and weak refs. Hold onto it via mObjectMap.
nsSharpObjectMapEntry* entry =
NS_STATIC_CAST(nsSharpObjectMapEntry*,
PL_DHashTableOperate(&mObjectMap, aObject,
PL_DHASH_ADD));
if (!entry) {
aObject->Release();
return NS_ERROR_OUT_OF_MEMORY;
}
if (!entry->mObject) {
// First time we've seen this object address: add it to mObjectMap
// and serialize the object at the current stream offset.
PRUint32 thisOffset;
rv = Tell(&thisOffset);
if (NS_FAILED(rv)) {
aObject->Release();
return rv;
}
// NB: aObject was already held, and mObject is a raw nsISupports*.
entry->mObject = aObject;
oid = (mObjectMap.entryCount << MFL_OBJECT_TAG_BITS);
entry->mOID = oid;
// NB: the (32-bit, fast) CID and object data follow the OID.
entry->mInfo.mCIDOffset = thisOffset + sizeof(oid);
entry->mInfo.mStrongRefCnt = aIsStrongRef ? 1 : 0;
entry->mInfo.mWeakRefCnt = aIsStrongRef ? 0 : 1;
oid |= MFL_OBJECT_DEF_TAG;
} else {
// Already serialized, recover oid and update the desired refcnt.
oid = entry->mOID;
if (aIsStrongRef) {
entry->mInfo.mStrongRefCnt++;
NS_ASSERTION(entry->mInfo.mStrongRefCnt != 0,
"mStrongRefCnt overflow");
} else {
entry->mInfo.mWeakRefCnt++;
NS_ASSERTION(entry->mInfo.mWeakRefCnt != 0,
"mWeakRefCnt overflow");
}
aObject->Release();
}
}
if (!aIsStrongRef)
oid |= MFL_WEAK_REF_TAG;
oid |= (aTags & MFL_QUERY_INTERFACE_TAG);
rv = Write32(oid ^ MFL_OID_XOR_KEY);
if (NS_FAILED(rv)) return rv;
if (oid & MFL_OBJECT_DEF_TAG) {
nsCOMPtr<nsIClassInfo> classInfo(do_QueryInterface(aObject));
nsCOMPtr<nsISerializable> serializable(do_QueryInterface(aObject));
if (!classInfo || !serializable)
return NS_ERROR_FAILURE;
nsCID slowCID;
rv = classInfo->GetClassIDNoAlloc(&slowCID);
if (NS_FAILED(rv)) return rv;
NSFastLoadID fastCID;
rv = MapID(slowCID, &fastCID);
if (NS_FAILED(rv)) return rv;
rv = WriteFastID(fastCID);
if (NS_FAILED(rv)) return rv;
rv = serializable->Write(this);
if (NS_FAILED(rv)) return rv;
}
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadFileWriter::WriteObject(nsISupports* aObject, PRBool aIsStrongRef)
{
#ifdef NS_DEBUG
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
NS_ASSERTION(rootObject.get() == aObject,
"bad call to WriteObject -- call WriteCompoundObject!");
#endif
return WriteObjectCommon(aObject, aIsStrongRef, 0);
}
NS_IMETHODIMP
nsFastLoadFileWriter::WriteSingleRefObject(nsISupports* aObject)
{
#ifdef NS_DEBUG
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
NS_ASSERTION(rootObject.get() == aObject,
"bad call to WriteObject -- call WriteCompoundObject!");
#endif
return WriteObjectCommon(aObject, PR_TRUE, MFL_SINGLE_REF_PSEUDO_TAG);
}
NS_IMETHODIMP
nsFastLoadFileWriter::WriteCompoundObject(nsISupports* aObject,
const nsIID& aIID,
PRBool aIsStrongRef)
{
nsresult rv;
nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
#ifdef NS_DEBUG
nsCOMPtr<nsISupports> roundtrip;
rootObject->QueryInterface(aIID, getter_AddRefs(roundtrip));
NS_ASSERTION(rootObject.get() != aObject,
"wasteful call to WriteCompoundObject -- call WriteObject!");
NS_ASSERTION(roundtrip.get() == aObject,
"bad aggregation or multiple inheritance detected by call to "
"WriteCompoundObject!");
#endif
rv = WriteObjectCommon(rootObject, aIsStrongRef, MFL_QUERY_INTERFACE_TAG);
if (NS_FAILED(rv)) return rv;
NSFastLoadID iid;
rv = MapID(aIID, &iid);
if (NS_FAILED(rv)) return rv;
return WriteFastID(iid);
}
NS_IMETHODIMP
nsFastLoadFileWriter::WriteID(const nsID& aID)
{
nsresult rv;
NSFastLoadID fastID;
rv = MapID(aID, &fastID);
if (NS_FAILED(rv)) return rv;
return WriteFastID(fastID);
}
NS_IMETHODIMP
nsFastLoadFileWriter::Seek(PRInt32 aWhence, PRInt32 aOffset)
{
mCurrentDocumentMapEntry = nsnull;
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
return seekable->Seek(aWhence, aOffset);
}
NS_IMETHODIMP
nsFastLoadFileWriter::Tell(PRUint32 *aResult)
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
return seekable->Tell(aResult);
}
NS_IMETHODIMP
nsFastLoadFileWriter::SetEOF()
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
return seekable->SetEOF();
}
NS_COM nsresult
NS_NewFastLoadFileWriter(nsIObjectOutputStream* *aResult,
nsIOutputStream* aDestStream)
{
nsFastLoadFileWriter* writer = new nsFastLoadFileWriter(aDestStream);
if (!writer)
return NS_ERROR_OUT_OF_MEMORY;
// Stabilize writer's refcnt.
nsCOMPtr<nsIObjectOutputStream> stream(writer);
nsresult rv = writer->Open();
if (NS_FAILED(rv))
return rv;
*aResult = stream;
NS_ADDREF(*aResult);
return NS_OK;
}
// -------------------------- nsFastLoadFileUpdater --------------------------
NS_IMPL_ISUPPORTS_INHERITED0(nsFastLoadFileUpdater,
nsFastLoadFileWriter)
PLDHashOperator PR_CALLBACK
nsFastLoadFileUpdater::CopyReadDocumentMapEntryToUpdater(PLDHashTable *aTable,
PLDHashEntryHdr *aHdr,
PRUint32 aNumber,
void *aData)
{
nsDocumentMapReadEntry* readEntry =
NS_STATIC_CAST(nsDocumentMapReadEntry*, aHdr);
nsFastLoadFileUpdater* updater =
NS_REINTERPRET_CAST(nsFastLoadFileUpdater*, aData);
void* spec = nsMemory::Clone(readEntry->mURISpec,
strlen(readEntry->mURISpec) + 1);
if (!spec)
return PL_DHASH_STOP;
nsDocumentMapWriteEntry* writeEntry =
NS_STATIC_CAST(nsDocumentMapWriteEntry*,
PL_DHashTableOperate(&updater->mDocumentMap, spec,
PL_DHASH_ADD));
if (!writeEntry) {
nsMemory::Free(spec);
return PL_DHASH_STOP;
}
writeEntry->mURISpec = NS_REINTERPRET_CAST(const char*, spec);
writeEntry->mInitialSegmentOffset = readEntry->mInitialSegmentOffset;
writeEntry->mCurrentSegmentOffset = 0;
return PL_DHASH_NEXT;
}
nsresult
nsFastLoadFileUpdater::Open(nsFastLoadFileReader* aReader)
{
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mOutputStream));
if (!seekable)
return NS_ERROR_UNEXPECTED;
nsresult rv;
rv = nsFastLoadFileWriter::Init();
if (NS_FAILED(rv)) return rv;
PRUint32 i, n;
// Map from dense, zero-based, uint32 NSFastLoadID in reader to 16-byte
// nsID in updater.
nsID* readIDMap = aReader->mFooter.mIDMap;
for (i = 0, n = aReader->mFooter.mNumIDs; i < n; i++) {
NSFastLoadID fastID;
rv = MapID(readIDMap[i], &fastID);
NS_ASSERTION(fastID == i + 1, "huh?");
if (NS_FAILED(rv)) return rv;
}
// Map from reader dense, zero-based MFL_OID_TO_SHARP_INDEX(oid) to sharp
// object offset and refcnt information in updater.
PRUint32 saveReadOffset;
rv = aReader->Tell(&saveReadOffset);
if (NS_FAILED(rv)) return rv;
nsFastLoadFileReader::nsObjectMapEntry* readObjectMap =
aReader->mFooter.mObjectMap;
for (i = 0, n = aReader->mFooter.mNumSharpObjects; i < n; i++) {
nsFastLoadFileReader::nsObjectMapEntry* readEntry = &readObjectMap[i];
nsISupports* obj = readEntry->mReadObject;
NSFastLoadOID oid = MFL_SHARP_INDEX_TO_OID(i);
void* key = obj
? NS_REINTERPRET_CAST(void*, obj)
: NS_REINTERPRET_CAST(void*, (oid | MFL_OBJECT_DEF_TAG));
nsSharpObjectMapEntry* writeEntry =
NS_STATIC_CAST(nsSharpObjectMapEntry*,
PL_DHashTableOperate(&mObjectMap, key,
PL_DHASH_ADD));
if (!writeEntry)
return NS_ERROR_OUT_OF_MEMORY;
// Hold the object if there is one, so that objmap_ClearEntry can
// release the reference.
NS_IF_ADDREF(obj);
writeEntry->mObject = NS_REINTERPRET_CAST(nsISupports*, key);
writeEntry->mOID = oid;
writeEntry->mInfo = *NS_STATIC_CAST(nsFastLoadSharpObjectInfo*,
readEntry);
}
rv = aReader->Seek(nsISeekableStream::NS_SEEK_SET, saveReadOffset);
if (NS_FAILED(rv)) return rv;
// Copy URI spec string and initial segment offset in FastLoad file from
// nsDocumentMapReadEntry in reader to mDocumentMapWriteEntry in updater.
// If we didn't enumerate all entries, we ran out of memory.
n = PL_DHashTableEnumerate(&aReader->mFooter.mDocumentMap,
CopyReadDocumentMapEntryToUpdater,
this);
if (n != aReader->mFooter.mDocumentMap.entryCount)
return NS_ERROR_OUT_OF_MEMORY;
// Copy source filename dependencies from reader to updater.
nsFastLoadDependencyArray& readDeps = aReader->mFooter.mDependencies;
for (i = 0, n = readDeps.Count(); i < n; i++) {
const char* s = NS_REINTERPRET_CAST(const char*,
readDeps.ElementAt(PRInt32(i)));
if (!mDependencies.AppendDependency(s))
return NS_ERROR_OUT_OF_MEMORY;
}
// Seek to the reader's footer offset so we overwrite the footer. First,
// update the header to have a zero mFooterOffset, which will invalidate
// the FastLoad file on next startup read attempt, should we crash before
// completing this update.
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
offsetof(nsFastLoadHeader, mFooterOffset));
if (NS_FAILED(rv)) return rv;
rv = Write32(0);
if (NS_FAILED(rv)) return rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET,
aReader->mHeader.mFooterOffset);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
NS_COM nsresult
NS_NewFastLoadFileUpdater(nsIObjectOutputStream* *aResult,
nsIOutputStream* aOutputStream,
nsFastLoadFileReader* aReader)
{
nsFastLoadFileUpdater* updater = new nsFastLoadFileUpdater(aOutputStream);
if (!updater)
return NS_ERROR_OUT_OF_MEMORY;
// Stabilize updater's refcnt.
nsCOMPtr<nsIObjectOutputStream> stream(updater);
nsresult rv = updater->Open(aReader);
if (NS_FAILED(rv))
return rv;
*aResult = stream;
NS_ADDREF(*aResult);
return NS_OK;
}
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