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