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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla 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/MPL/
+ *
+ * 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 the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Brendan Eich <brendan@mozilla.org> (original author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsFastLoadFile_h___
+#define nsFastLoadFile_h___
+
+/**
+ * Mozilla FastLoad file format and helper types.
+ */
+
+#include "prtypes.h"
+#include "pldhash.h"
+
+#include "nsBinaryStream.h"
+#include "nsCOMPtr.h"
+#include "nsDebug.h"
+#include "nsID.h"
+#include "nsMemory.h"
+#include "nsVoidArray.h"
+
+#include "nsIFastLoadFileControl.h"
+#include "nsIFastLoadService.h"
+#include "nsISeekableStream.h"
+#include "nsISupportsArray.h"
+
+/**
+ * FastLoad file Object ID (OID) is an identifier for multiply and cyclicly
+ * connected objects in the serialized graph of all reachable objects.
+ *
+ * Holy Mixed Metaphors: JS, after Common Lisp, uses #n= to define a "sharp
+ * variable" naming an object that's multiply or cyclicly connected, and #n#
+ * to stand for a connection to an already-defined object. We too call any
+ * object with multiple references "sharp", and (here it comes) any object
+ * with only one reference "dull".
+ *
+ * Note that only sharp objects require a mapping from OID to FastLoad file
+ * offset and other information. Dull objects can be serialized _in situ_
+ * (where they are referenced) and deserialized when their (singular, shared)
+ * OID is scanned.
+ *
+ * We also compress 16-byte XPCOM IDs into 32-bit dense identifiers to save
+ * space. See nsFastLoadFooter, below, for the mapping data structure used to
+ * compute an nsID given an NSFastLoadID.
+ */
+typedef PRUint32 NSFastLoadID; // nsFastLoadFooter::mIDMap index
+typedef PRUint32 NSFastLoadOID; // nsFastLoadFooter::mObjectMap index
+
+/**
+ * A Mozilla FastLoad file is an untagged (in general) stream of objects and
+ * primitive-type data. Small integers are fairly common, and could easily be
+ * confused for NSFastLoadIDs and NSFastLoadOIDs. To help catch bugs where
+ * reader and writer code fail to match, we XOR unlikely 32-bit numbers with
+ * NSFastLoad*IDs when storing and fetching. The following unlikely values are
+ * irrational numbers ((sqrt(5)-1)/2, sqrt(2)-1) represented in fixed point.
+ *
+ * The reader XORs, converts the ID to an index, and bounds-checks all array
+ * accesses that use the index. Array access code asserts that the index is in
+ * bounds, and returns a dummy array element if it isn't.
+ */
+#define MFL_ID_XOR_KEY 0x9E3779B9 // key XOR'd with ID when serialized
+#define MFL_OID_XOR_KEY 0x6A09E667 // key XOR'd with OID when serialized
+
+/**
+ * An OID can be tagged to introduce the serialized definition of the object,
+ * or to stand for a strong or weak reference to that object. Thus the high
+ * 29 bits actually identify the object, and the low three bits tell whether
+ * the object is being defined or just referenced -- and via what inheritance
+ * chain or inner object, if necessary.
+ *
+ * The MFL_QUERY_INTERFACE_TAG bit helps us cope with aggregation and multiple
+ * inheritance: object identity follows the XPCOM rule, but a deserializer may
+ * need to query for an interface not on the primary inheritance chain ending
+ * in the nsISupports whose address uniquely identifies the XPCOM object being
+ * referenced or defined.
+ */
+#define MFL_OBJECT_TAG_BITS 3
+#define MFL_OBJECT_TAG_MASK PR_BITMASK(MFL_OBJECT_TAG_BITS)
+
+#define MFL_OBJECT_DEF_TAG 1U // object definition follows this OID
+#define MFL_WEAK_REF_TAG 2U // OID weakly refers to a prior object
+ // NB: do not confuse with nsWeakPtr!
+#define MFL_QUERY_INTERFACE_TAG 4U // QI object to the ID follows this OID
+ // NB: an NSFastLoadID, not an nsIID!
+
+/**
+ * The dull object identifier introduces the definition of all objects that
+ * have only one (necessarily strong) ref in the serialization. The definition
+ * appears at the point of reference.
+ */
+#define MFL_DULL_OBJECT_OID MFL_OBJECT_DEF_TAG
+
+/**
+ * Convert an OID to an index into nsFastLoadFooter::mObjectMap.
+ */
+#define MFL_OID_TO_SHARP_INDEX(oid) (((oid) >> MFL_OBJECT_TAG_BITS) - 1)
+#define MFL_SHARP_INDEX_TO_OID(index) (((index) + 1) << MFL_OBJECT_TAG_BITS)
+
+/**
+ * Magic "number" at start of a FastLoad file. Inspired by the PNG "magic"
+ * string, which inspired XPCOM's typelib (.xpt) file magic. Guaranteed to be
+ * corrupted by FTP-as-ASCII and other likely errors, meaningful to clued-in
+ * humans, and ending in ^Z to terminate erroneous text input on Windows.
+ */
+#define MFL_FILE_MAGIC "XPCOM\nMozFASL\r\n\032"
+#define MFL_FILE_MAGIC_SIZE 16
+
+#define MFL_FILE_VERSION_0 0
+#define MFL_FILE_VERSION_1 1000
+#define MFL_FILE_VERSION 4 // fix to note singletons in object map
+
+/**
+ * Compute Fletcher's 16-bit checksum over aLength bytes starting at aBuffer,
+ * with the initial accumulators seeded from *aChecksum, and final checksum
+ * returned in *aChecksum. The return value is the number of unchecked bytes,
+ * which may be non-zero if aBuffer is misaligned or aLength is odd. Callers
+ * should copy any remaining bytes to the front of the next buffer.
+ *
+ * If aLastBuffer is false, do not check any bytes remaining due to misaligned
+ * aBuffer or odd aLength, instead returning the remaining byte count. But if
+ * aLastBuffer is true, treat aBuffer as the last buffer in the file and check
+ * every byte, returning 0. Here's a read-loop checksumming sketch:
+ *
+ * char buf[BUFSIZE];
+ * PRUint32 len, rem = 0;
+ * PRUint32 checksum = 0;
+ *
+ * while (NS_SUCCEEDED(rv = Read(buf + rem, sizeof buf - rem, &len)) && len) {
+ * len += rem;
+ * rem = NS_AccumulateFastLoadChecksum(&checksum,
+ * NS_REINTERPRET_CAST(PRUint8*, buf),
+ * len,
+ * PR_FALSE);
+ * if (rem)
+ * memcpy(buf, buf + len - rem, rem);
+ * }
+ *
+ * if (rem) {
+ * NS_AccumulateFastLoadChecksum(&checksum,
+ * NS_REINTERPRET_CAST(PRUint8*, buf),
+ * rem,
+ * PR_TRUE);
+ * }
+ *
+ * After this, if NS_SUCCEEDED(rv), checksum contains a valid FastLoad sum.
+ */
+PR_EXTERN(PRUint32)
+NS_AccumulateFastLoadChecksum(PRUint32 *aChecksum,
+ const PRUint8* aBuffer,
+ PRUint32 aLength,
+ PRBool aLastBuffer);
+
+PR_EXTERN(PRUint32)
+NS_AddFastLoadChecksums(PRUint32 sum1, PRUint32 sum2, PRUint32 sum2ByteCount);
+
+/**
+ * Header at the start of a FastLoad file.
+ */
+struct nsFastLoadHeader {
+ char mMagic[MFL_FILE_MAGIC_SIZE];
+ PRUint32 mChecksum;
+ PRUint32 mVersion;
+ PRUint32 mFooterOffset;
+ PRUint32 mFileSize;
+};
+
+/**
+ * Footer prefix structure (footer header, ugh), after which come arrays of
+ * structures or strings counted by these members.
+ */
+struct nsFastLoadFooterPrefix {
+ PRUint32 mNumIDs;
+ PRUint32 mNumSharpObjects;
+ PRUint32 mNumMuxedDocuments;
+ PRUint32 mNumDependencies;
+};
+
+struct nsFastLoadSharpObjectInfo {
+ PRUint32 mCIDOffset; // offset of object's NSFastLoadID and data
+ PRUint16 mStrongRefCnt;
+ PRUint16 mWeakRefCnt; // high bit is singleton flag, see below
+};
+
+#define MFL_SINGLETON_FLAG 0x8000
+#define MFL_WEAK_REFCNT_MASK 0x7fff
+
+#define MFL_GET_SINGLETON_FLAG(ip) ((ip)->mWeakRefCnt & MFL_SINGLETON_FLAG)
+#define MFL_GET_WEAK_REFCNT(ip) ((ip)->mWeakRefCnt & MFL_WEAK_REFCNT_MASK)
+
+#define MFL_SET_SINGLETON_FLAG(ip) \
+ ((ip)->mWeakRefCnt |= MFL_SINGLETON_FLAG)
+#define MFL_SET_WEAK_REFCNT(ip,rc) \
+ ((ip)->mWeakRefCnt = (((ip)->mWeakRefCnt & MFL_SINGLETON_FLAG) | (rc)))
+
+#define MFL_BUMP_WEAK_REFCNT(ip) (++(ip)->mWeakRefCnt)
+#define MFL_DROP_WEAK_REFCNT(ip) (--(ip)->mWeakRefCnt)
+
+struct nsFastLoadMuxedDocumentInfo {
+ const char* mURISpec;
+ PRUint32 mInitialSegmentOffset;
+};
+
+// forward declarations of opaque types defined in nsFastLoadFile.cpp
+struct nsDocumentMapReadEntry;
+struct nsDocumentMapWriteEntry;
+
+// So nsFastLoadFileUpdater can verify that its nsIObjectInputStream parameter
+// is an nsFastLoadFileReader.
+#define NS_FASTLOADFILEREADER_IID \
+ {0x7d37d1bb,0xcef3,0x4c5f,{0x97,0x68,0x0f,0x89,0x7f,0x1a,0xe1,0x40}}
+
+struct nsIFastLoadFileReader : public nsISupports {
+ NS_DEFINE_STATIC_IID_ACCESSOR(NS_FASTLOADFILEREADER_IID)
+};
+
+/**
+ * Inherit from the concrete class nsBinaryInputStream, which inherits from
+ * abstract nsIObjectInputStream but does not implement its direct methods.
+ * Though the names are not as clear as I'd like, this seems to be the best
+ * way to share nsBinaryStream.cpp code.
+ */
+class nsFastLoadFileReader
+ : public nsBinaryInputStream,
+ public nsIFastLoadReadControl,
+ public nsISeekableStream,
+ public nsIFastLoadFileReader
+{
+ public:
+ nsFastLoadFileReader(nsIInputStream *aStream)
+ : mCurrentDocumentMapEntry(nsnull) {
+ SetInputStream(aStream);
+ MOZ_COUNT_CTOR(nsFastLoadFileReader);
+ }
+
+ virtual ~nsFastLoadFileReader() {
+ MOZ_COUNT_DTOR(nsFastLoadFileReader);
+ }
+
+ private:
+ // nsISupports methods
+ NS_DECL_ISUPPORTS_INHERITED
+
+ // overridden nsIObjectInputStream methods
+ NS_IMETHOD ReadObject(PRBool aIsStrongRef, nsISupports* *_retval);
+ NS_IMETHOD ReadID(nsID *aResult);
+
+ // nsIFastLoadFileControl methods
+ NS_DECL_NSIFASTLOADFILECONTROL
+
+ // nsIFastLoadReadControl methods
+ NS_DECL_NSIFASTLOADREADCONTROL
+
+ // nsISeekableStream methods
+ NS_DECL_NSISEEKABLESTREAM
+
+ // Override Read so we can demultiplex a document interleaved with others.
+ NS_IMETHOD Read(char* aBuffer, PRUint32 aCount, PRUint32 *aBytesRead);
+
+ // Override ReadSegments too, as nsBinaryInputStream::ReadSegments does
+ // not call through our overridden Read method -- it calls directly into
+ // the underlying input stream.
+ NS_IMETHODIMP ReadSegments(nsWriteSegmentFun aWriter, void* aClosure,
+ PRUint32 aCount, PRUint32 *aResult);
+
+ nsresult ReadHeader(nsFastLoadHeader *aHeader);
+
+ /**
+ * In-memory representation of an indexed nsFastLoadSharpObjectInfo record.
+ */
+ struct nsObjectMapEntry : public nsFastLoadSharpObjectInfo {
+ nsCOMPtr<nsISupports> mReadObject;
+ PRInt64 mSkipOffset;
+ PRUint16 mSaveStrongRefCnt; // saved for an Update
+ PRUint16 mSaveWeakRefCnt; // after a Read
+ };
+
+ /**
+ * In-memory representation of the FastLoad file footer.
+ */
+ struct nsFastLoadFooter : public nsFastLoadFooterPrefix {
+ nsFastLoadFooter()
+ : mIDMap(nsnull),
+ mObjectMap(nsnull) {
+ mDocumentMap.ops = mURIMap.ops = nsnull;
+ }
+
+ ~nsFastLoadFooter() {
+ delete[] mIDMap;
+ delete[] mObjectMap;
+ if (mDocumentMap.ops)
+ PL_DHashTableFinish(&mDocumentMap);
+ if (mURIMap.ops)
+ PL_DHashTableFinish(&mURIMap);
+ }
+
+ // These can't be static within GetID and GetSharpObjectEntry or the
+ // toolchains on HP-UX 10.20's, RH 7.0, and Mac OS X all barf at link
+ // time ("common symbols not allowed with MY_DHLIB output format", to
+ // quote the OS X rev of gcc).
+ static nsID gDummyID;
+ static nsObjectMapEntry gDummySharpObjectEntry;
+
+ const nsID& GetID(NSFastLoadID aFastId) const {
+ PRUint32 index = aFastId - 1;
+ NS_ASSERTION(index < mNumIDs, "aFastId out of range");
+ if (index >= mNumIDs)
+ return gDummyID;
+ return mIDMap[index];
+ }
+
+ nsObjectMapEntry&
+ GetSharpObjectEntry(NSFastLoadOID aOID) const {
+ PRUint32 index = MFL_OID_TO_SHARP_INDEX(aOID);
+ NS_ASSERTION(index < mNumSharpObjects, "aOID out of range");
+ if (index >= mNumSharpObjects)
+ return gDummySharpObjectEntry;
+ return mObjectMap[index];
+ }
+
+ // Map from dense, zero-based, uint32 NSFastLoadID to 16-byte nsID.
+ nsID* mIDMap;
+
+ // Map from dense, zero-based MFL_OID_TO_SHARP_INDEX(oid) to sharp
+ // object offset and refcnt information.
+ nsObjectMapEntry* mObjectMap;
+
+ // Map from URI spec string to nsDocumentMapReadEntry, which helps us
+ // demultiplex a document's objects from among the interleaved object
+ // stream segments in the FastLoad file.
+ PLDHashTable mDocumentMap;
+
+ // Fast mapping from URI object pointer to mDocumentMap entry, valid
+ // only while the muxed document is loading.
+ PLDHashTable mURIMap;
+
+ // List of source filename dependencies that should trigger regeneration
+ // of the FastLoad file.
+ nsCOMPtr<nsISupportsArray> mDependencies;
+ };
+
+ nsresult ReadFooter(nsFastLoadFooter *aFooter);
+ nsresult ReadFooterPrefix(nsFastLoadFooterPrefix *aFooterPrefix);
+ nsresult ReadSlowID(nsID *aID);
+ nsresult ReadFastID(NSFastLoadID *aID);
+ nsresult ReadSharpObjectInfo(nsFastLoadSharpObjectInfo *aInfo);
+ nsresult ReadMuxedDocumentInfo(nsFastLoadMuxedDocumentInfo *aInfo);
+ nsresult DeserializeObject(nsISupports* *aObject);
+
+ nsresult Open();
+ NS_IMETHOD Close();
+
+ protected:
+ nsFastLoadHeader mHeader;
+ nsFastLoadFooter mFooter;
+
+ nsDocumentMapReadEntry* mCurrentDocumentMapEntry;
+
+ friend class nsFastLoadFileUpdater;
+};
+
+NS_COM nsresult
+NS_NewFastLoadFileReader(nsIObjectInputStream* *aResult,
+ nsIInputStream* aSrcStream);
+
+/**
+ * Inherit from the concrete class nsBinaryInputStream, which inherits from
+ * abstract nsIObjectInputStream but does not implement its direct methods.
+ * Though the names are not as clear as I'd like, this seems to be the best
+ * way to share nsBinaryStream.cpp code.
+ */
+class nsFastLoadFileWriter
+ : public nsBinaryOutputStream,
+ public nsIFastLoadWriteControl,
+ public nsISeekableStream
+{
+ public:
+ nsFastLoadFileWriter(nsIOutputStream *aStream, nsIFastLoadFileIO* aFileIO)
+ : mCurrentDocumentMapEntry(nsnull),
+ mFileIO(aFileIO)
+ {
+ SetOutputStream(aStream);
+ mHeader.mChecksum = 0;
+ mIDMap.ops = mObjectMap.ops = mDocumentMap.ops = mURIMap.ops = nsnull;
+ mDependencyMap.ops = nsnull;
+ MOZ_COUNT_CTOR(nsFastLoadFileWriter);
+ }
+
+ virtual ~nsFastLoadFileWriter()
+ {
+ if (mIDMap.ops)
+ PL_DHashTableFinish(&mIDMap);
+ if (mObjectMap.ops)
+ PL_DHashTableFinish(&mObjectMap);
+ if (mDocumentMap.ops)
+ PL_DHashTableFinish(&mDocumentMap);
+ if (mURIMap.ops)
+ PL_DHashTableFinish(&mURIMap);
+ if (mDependencyMap.ops)
+ PL_DHashTableFinish(&mDependencyMap);
+ MOZ_COUNT_DTOR(nsFastLoadFileWriter);
+ }
+
+ private:
+ // nsISupports methods
+ NS_DECL_ISUPPORTS_INHERITED
+
+ // overridden nsIObjectOutputStream methods
+ NS_IMETHOD WriteObject(nsISupports* aObject, PRBool aIsStrongRef);
+ NS_IMETHOD WriteSingleRefObject(nsISupports* aObject);
+ NS_IMETHOD WriteCompoundObject(nsISupports* aObject,
+ const nsIID& aIID,
+ PRBool aIsStrongRef);
+ NS_IMETHOD WriteID(const nsID& aID);
+
+ // nsIFastLoadFileControl methods
+ NS_DECL_NSIFASTLOADFILECONTROL
+
+ // nsIFastLoadWriteControl methods
+ NS_DECL_NSIFASTLOADWRITECONTROL
+
+ // nsISeekableStream methods
+ NS_DECL_NSISEEKABLESTREAM
+
+ nsresult MapID(const nsID& aSlowID, NSFastLoadID *aResult);
+
+ nsresult WriteHeader(nsFastLoadHeader *aHeader);
+ nsresult WriteFooter();
+ nsresult WriteFooterPrefix(const nsFastLoadFooterPrefix& aFooterPrefix);
+ nsresult WriteSlowID(const nsID& aID);
+ nsresult WriteFastID(NSFastLoadID aID);
+ nsresult WriteSharpObjectInfo(const nsFastLoadSharpObjectInfo& aInfo);
+ nsresult WriteMuxedDocumentInfo(const nsFastLoadMuxedDocumentInfo& aInfo);
+
+ nsresult Init();
+ nsresult Open();
+ NS_IMETHOD Close();
+
+ nsresult WriteObjectCommon(nsISupports* aObject,
+ PRBool aIsStrongRef,
+ PRUint32 aQITag);
+
+ static PLDHashOperator PR_CALLBACK
+ IDMapEnumerate(PLDHashTable *aTable,
+ PLDHashEntryHdr *aHdr,
+ PRUint32 aNumber,
+ void *aData);
+
+ static PLDHashOperator PR_CALLBACK
+ ObjectMapEnumerate(PLDHashTable *aTable,
+ PLDHashEntryHdr *aHdr,
+ PRUint32 aNumber,
+ void *aData);
+
+ static PLDHashOperator PR_CALLBACK
+ DocumentMapEnumerate(PLDHashTable *aTable,
+ PLDHashEntryHdr *aHdr,
+ PRUint32 aNumber,
+ void *aData);
+
+ static PLDHashOperator PR_CALLBACK
+ DependencyMapEnumerate(PLDHashTable *aTable,
+ PLDHashEntryHdr *aHdr,
+ PRUint32 aNumber,
+ void *aData);
+
+ protected:
+ nsFastLoadHeader mHeader;
+
+ PLDHashTable mIDMap;
+ PLDHashTable mObjectMap;
+ PLDHashTable mDocumentMap;
+ PLDHashTable mURIMap;
+ PLDHashTable mDependencyMap;
+
+ nsDocumentMapWriteEntry* mCurrentDocumentMapEntry;
+ nsCOMPtr<nsIFastLoadFileIO> mFileIO;
+};
+
+NS_COM nsresult
+NS_NewFastLoadFileWriter(nsIObjectOutputStream* *aResult,
+ nsIOutputStream* aDestStream,
+ nsIFastLoadFileIO* aFileIO);
+
+/**
+ * Subclass of nsFastLoadFileWriter, friend of nsFastLoadFileReader which it
+ * wraps when a FastLoad file needs to be updated. The wrapped reader can be
+ * used to demulitplex data for documents already in the FastLoad file, while
+ * the updater writes new data over the old footer, then writes a new footer
+ * that maps all data on Close.
+ */
+class nsFastLoadFileUpdater
+ : public nsFastLoadFileWriter,
+ nsIFastLoadFileIO
+{
+ public:
+ nsFastLoadFileUpdater(nsIOutputStream* aOutputStream)
+ : nsFastLoadFileWriter(aOutputStream, nsnull) {
+ MOZ_COUNT_CTOR(nsFastLoadFileUpdater);
+ }
+
+ virtual ~nsFastLoadFileUpdater() {
+ MOZ_COUNT_DTOR(nsFastLoadFileUpdater);
+ }
+
+ private:
+ // nsISupports methods
+ NS_DECL_ISUPPORTS_INHERITED
+
+ // nsIFastLoadFileIO methods
+ NS_DECL_NSIFASTLOADFILEIO
+
+ nsresult Open(nsFastLoadFileReader* aReader);
+ NS_IMETHOD Close();
+
+ static PLDHashOperator PR_CALLBACK
+ CopyReadDocumentMapEntryToUpdater(PLDHashTable *aTable,
+ PLDHashEntryHdr *aHdr,
+ PRUint32 aNumber,
+ void *aData);
+
+ friend class nsFastLoadFileReader;
+
+ protected:
+ nsCOMPtr<nsIInputStream> mInputStream;
+};
+
+NS_COM nsresult
+NS_NewFastLoadFileUpdater(nsIObjectOutputStream* *aResult,
+ nsIOutputStream* aOutputStream,
+ nsIObjectInputStream* aReaderAsStream);
+
+#endif // nsFastLoadFile_h___
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