mirror of
https://github.com/mozilla/gecko-dev.git
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700 lines
18 KiB
C++
700 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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.org 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) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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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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#include "nsID.h"
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#include "nsCRT.h"
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#include "nsReadableUtils.h"
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#include "nsIInputStream.h"
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#include "nsIUnicharInputStream.h"
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#include "pratom.h"
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#include "nsEnumeratorUtils.h"
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#include "nsReadableUtils.h"
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#include "nsPrintfCString.h"
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#include "nsDependentString.h"
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "nsPersistentProperties.h"
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#include "nsIProperties.h"
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#include "nsProperties.h"
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#define PROP_BUFFER_SIZE 2048
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struct propertyTableEntry : public PLDHashEntryHdr
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{
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// both of these are arena-allocated
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const char *mKey;
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const PRUnichar *mValue;
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};
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static PRUnichar*
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ArenaStrdup(const nsAFlatString& aString, PLArenaPool* aArena)
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{
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void *mem;
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// add one to include the null terminator
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PRInt32 len = (aString.Length()+1) * sizeof(PRUnichar);
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PL_ARENA_ALLOCATE(mem, aArena, len);
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NS_ASSERTION(mem, "Couldn't allocate space!\n");
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if (mem) {
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memcpy(mem, aString.get(), len);
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}
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return NS_STATIC_CAST(PRUnichar*, mem);
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}
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static char*
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ArenaStrdup(const nsAFlatCString& aString, PLArenaPool* aArena)
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{
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void *mem;
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// add one to include the null terminator
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PRInt32 len = (aString.Length()+1) * sizeof(char);
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PL_ARENA_ALLOCATE(mem, aArena, len);
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NS_ASSERTION(mem, "Couldn't allocate space!\n");
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if (mem)
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memcpy(mem, aString.get(), len);
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return NS_STATIC_CAST(char*, mem);
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}
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PR_STATIC_CALLBACK(PRBool)
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matchPropertyKeys(PLDHashTable*, const PLDHashEntryHdr* aHdr,
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const void *key)
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{
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const propertyTableEntry* entry =
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NS_STATIC_CAST(const propertyTableEntry*,aHdr);
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const char *keyValue = NS_STATIC_CAST(const char*,key);
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return (strcmp(entry->mKey, keyValue)==0);
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}
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PR_STATIC_CALLBACK(const void*)
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getPropertyKey(PLDHashTable*, PLDHashEntryHdr* aHdr)
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{
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propertyTableEntry* entry =
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NS_STATIC_CAST(propertyTableEntry*, aHdr);
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return entry->mKey;
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}
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struct PLDHashTableOps property_HashTableOps = {
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PL_DHashAllocTable,
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PL_DHashFreeTable,
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getPropertyKey,
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PL_DHashStringKey,
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matchPropertyKeys,
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PL_DHashMoveEntryStub,
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PL_DHashClearEntryStub,
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PL_DHashFinalizeStub,
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nsnull,
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};
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//
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// parser stuff
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//
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enum {
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eParserState_AwaitingKey,
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eParserState_Key,
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eParserState_AwaitingValue,
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eParserState_Value,
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eParserState_Comment,
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};
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enum {
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eParserSpecial_None, // not parsing a special character
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eParserSpecial_Escaped, // awaiting a special character
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eParserSpecial_Unicode, // parsing a \Uxxx value
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};
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class nsParserState
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{
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public:
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nsParserState(nsIPersistentProperties* aProps) :
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mState(eParserState_AwaitingKey), mProps(aProps) {}
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void WaitForKey() {
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mState = eParserState_AwaitingKey;
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}
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void EnterKeyState() {
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mKey.Truncate();
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mState = eParserState_Key;
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}
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void WaitForValue() {
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mState = eParserState_AwaitingValue;
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}
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void EnterValueState() {
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mValue.Truncate();
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mState = eParserState_Value;
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mSpecialState = eParserSpecial_None;
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}
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void FinishValueState(nsAString& aOldValue) {
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mProps->SetStringProperty(NS_ConvertUCS2toUTF8(mKey), mValue, aOldValue);
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mSpecialState = eParserSpecial_None;
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WaitForKey();
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}
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void EnterCommentState() {
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mState = eParserState_Comment;
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}
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nsAutoString mKey;
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nsAutoString mValue;
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PRUint32 GetState() { return mState; }
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// if we see a '\' then we enter this special state
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PRUint32 mSpecialState;
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PRUint32 mUnicodeValuesRead; // should be 4!
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PRUnichar mUnicodeValue;
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private:
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PRUint32 mState;
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nsCOMPtr<nsIPersistentProperties> mProps; // weak
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};
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nsPersistentProperties::nsPersistentProperties()
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{
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mIn = nsnull;
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mSubclass = NS_STATIC_CAST(nsIPersistentProperties*, this);
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PL_DHashTableInit(&mTable, &property_HashTableOps, nsnull,
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sizeof(propertyTableEntry), 20);
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PL_INIT_ARENA_POOL(&mArena, "PersistentPropertyArena", 2048);
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}
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nsPersistentProperties::~nsPersistentProperties()
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{
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PL_FinishArenaPool(&mArena);
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PL_DHashTableFinish(&mTable);
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}
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NS_METHOD
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nsPersistentProperties::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
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{
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if (aOuter)
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return NS_ERROR_NO_AGGREGATION;
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nsPersistentProperties* props = new nsPersistentProperties();
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if (props == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(props);
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nsresult rv = props->QueryInterface(aIID, aResult);
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NS_RELEASE(props);
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return rv;
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}
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsPersistentProperties, nsIPersistentProperties, nsIProperties)
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// for future support of segmented reads - see bug 189528
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#if 0
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NS_METHOD
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nsPersistentProperties::SegmentWriter(nsIInputStream* aStream,
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void* aClosure,
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const char* aFromSegment,
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PRUint32 aToOffset,
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PRUint32 aCount,
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PRUint32* aWriteCount)
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{
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nsParserState *parseState =
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NS_STATIC_CAST(nsParserState*, aClosure);
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// this won't work until ParseBuffer starts taking raw UTF8, rather
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// than unicode
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ParseBuffer(*parserState, aFromSegment, aCount);
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return rv;
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}
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#endif
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#define IS_WHITE_SPACE(c) \
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(((c) == ' ') || ((c) == '\t') || ((c) == '\r') || ((c) == '\n'))
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#define IS_EOL(c) \
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(((c) == '\r') || ((c) == '\n'))
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static void
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ParseValueCharacter(nsParserState& aState, PRUnichar c,
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const PRUnichar* cur, const PRUnichar* &tokenStart,
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nsAString& oldValue)
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{
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switch (aState.mSpecialState) {
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// the normal state - look for special characters
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case eParserSpecial_None:
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switch (c) {
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case '\\':
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aState.mSpecialState = eParserSpecial_Escaped;
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aState.mValue += Substring(tokenStart, cur);
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break;
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case '\n':
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case '\r':
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// we're done! We have a key and value
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aState.mValue += Substring(tokenStart, cur);
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aState.FinishValueState(oldValue);
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break;
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default:
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// there is nothing to do with normal characters
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break;
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}
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break;
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// saw a \ character, so parse the character after that
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case eParserSpecial_Escaped:
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// probably want to start parsing at the next token
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// other characters, like 'u' might override this
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tokenStart = cur+1;
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aState.mSpecialState = eParserSpecial_None;
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switch (c) {
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// the easy characters - \t, \n, and so forth
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case 't':
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aState.mKey += PRUnichar('\t');
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break;
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case 'n':
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aState.mKey += PRUnichar('\n');
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break;
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case 'r':
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aState.mKey += PRUnichar('\r');
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break;
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case '\\':
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aState.mKey += PRUnichar('\\');
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break;
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// switch to unicode mode!
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case 'u':
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case 'U':
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aState.mSpecialState = eParserSpecial_Unicode;
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aState.mUnicodeValuesRead = 0;
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aState.mUnicodeValue = 0;
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break;
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// a \ immediately followed by a newline means we're going multiline
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case '\r':
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case '\n':
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aState.mSpecialState = eParserSpecial_None;
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break;
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default:
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// don't recognize the character, so just append it
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NS_WARNING("Unknown escaped value in properties file");
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aState.mValue += c;
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break;
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}
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break;
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// we're in the middle of parsing a 4-character unicode value
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// like \u5f39
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case eParserSpecial_Unicode:
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// first check if this is the last character or not
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if (++aState.mUnicodeValuesRead >= 4) {
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tokenStart = cur+1;
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aState.mSpecialState = eParserSpecial_None;
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}
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if(('0' <= c) && (c <= '9'))
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aState.mUnicodeValue =
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(aState.mUnicodeValue << 4) | (c - '0');
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else if(('a' <= c) && (c <= 'f'))
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aState.mUnicodeValue =
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(aState.mUnicodeValue << 4) | (c - 'a' + 0x0a);
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else if(('A' <= c) && (c <= 'F'))
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aState.mUnicodeValue =
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(aState.mUnicodeValue << 4) | (c - 'A' + 0x0a);
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else {
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// unrecognized character. Append what we have, and move on.
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aState.mValue += aState.mUnicodeValue;
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aState.mSpecialState = eParserSpecial_None;
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// leave tokenStart at this unknown character
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tokenStart = cur;
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}
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break;
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}
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}
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static nsresult
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ParseBuffer(nsParserState& aState,
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const PRUnichar* aBuffer,
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PRUint32 aBufferLength)
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{
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const PRUnichar* cur = aBuffer;
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const PRUnichar* end = aBuffer + aBufferLength;
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// points the start/end of the current key or value
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const PRUnichar* tokenStart = nsnull;
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// if we're in the middle of parsing a key or value, make sure
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// the current token points to the beginning of the current buffer
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if (aState.GetState() == eParserState_Key ||
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aState.GetState() == eParserState_Value) {
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tokenStart = aBuffer;
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}
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nsAutoString oldValue;
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while (cur != end) {
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PRUnichar c = *cur;
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switch (aState.GetState()) {
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case eParserState_AwaitingKey:
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if (c == '#' || c == '!')
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aState.EnterCommentState();
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else if (!IS_WHITE_SPACE(c)) {
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// not a comment, not whitespace, we must have found a key!
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aState.EnterKeyState();
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tokenStart = cur;
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}
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break;
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case eParserState_Key:
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if (c == '=' || c == ':') {
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aState.mKey += Substring(tokenStart, cur);
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aState.WaitForValue();
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}
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break;
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case eParserState_AwaitingValue:
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if (IS_EOL(c)) {
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// no value at all! mimic the normal value-ending4
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aState.EnterValueState();
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aState.mValue.Truncate();
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aState.FinishValueState(oldValue);
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}
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// ignore white space leading up to the value
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else if (!IS_WHITE_SPACE(c)) {
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tokenStart = cur;
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aState.EnterValueState();
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// make sure to handle this first character
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ParseValueCharacter(aState, c, cur, tokenStart, oldValue);
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}
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break;
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case eParserState_Value:
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ParseValueCharacter(aState, c, cur, tokenStart, oldValue);
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break;
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case eParserState_Comment:
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// stay in this state till we hit EOL
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if (c == '\r' || c== '\n')
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aState.WaitForKey();
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break;
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}
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// finally, advance to the next character
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cur++;
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}
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// if we're still parsing the value, then append whatever we have..
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if (aState.GetState() == eParserState_Value && tokenStart)
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aState.mValue += Substring(tokenStart, cur);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPersistentProperties::Load(nsIInputStream *aIn)
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{
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nsresult ret = NS_NewUTF8ConverterStream(getter_AddRefs(mIn), aIn, 0);
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if (ret != NS_OK) {
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NS_WARNING("NS_NewUTF8ConverterStream failed");
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return NS_ERROR_FAILURE;
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}
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PRUnichar buf[PROP_BUFFER_SIZE];
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PRUint32 nRead;
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nsParserState parserState(mSubclass);
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// for future support of segmented reads - see bug 189528
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#if 0
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ret = mIn->ReadSegments(SegmentWriter, this, 0);
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#endif
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ret = mIn->Read(buf, 0, PROP_BUFFER_SIZE, &nRead);
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while (NS_SUCCEEDED(ret) && nRead > 0) {
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ParseBuffer(parserState, buf, nRead);
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ret = mIn->Read(buf, 0, PROP_BUFFER_SIZE, &nRead);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPersistentProperties::SetStringProperty(const nsACString& aKey,
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const nsAString& aNewValue,
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nsAString& aOldValue)
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{
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const nsAFlatCString& flatKey = PromiseFlatCString(aKey);
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propertyTableEntry *entry =
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NS_STATIC_CAST(propertyTableEntry*,
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PL_DHashTableOperate(&mTable, flatKey.get(), PL_DHASH_ADD));
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if (entry->mKey) {
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aOldValue = entry->mValue;
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NS_WARNING(nsPrintfCString(aKey.Length() + 30,
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"the property %s already exists\n",
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flatKey.get()).get());
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}
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entry->mKey = ArenaStrdup(flatKey, &mArena);
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entry->mValue = ArenaStrdup(PromiseFlatString(aNewValue), &mArena);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPersistentProperties::Save(nsIOutputStream* aOut, const nsACString& aHeader)
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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nsPersistentProperties::Subclass(nsIPersistentProperties* aSubclass)
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{
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if (aSubclass) {
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mSubclass = aSubclass;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPersistentProperties::GetStringProperty(const nsACString& aKey,
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nsAString& aValue)
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{
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const nsAFlatCString& flatKey = PromiseFlatCString(aKey);
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propertyTableEntry *entry =
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NS_STATIC_CAST(propertyTableEntry*,
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PL_DHashTableOperate(&mTable, flatKey.get(), PL_DHASH_LOOKUP));
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if (PL_DHASH_ENTRY_IS_FREE(entry))
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return NS_ERROR_FAILURE;
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aValue = entry->mValue;
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return NS_OK;
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}
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PR_STATIC_CALLBACK(PLDHashOperator)
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AddElemToArray(PLDHashTable* table, PLDHashEntryHdr *hdr,
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PRUint32 i, void *arg)
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{
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nsISupportsArray *propArray = (nsISupportsArray *) arg;
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propertyTableEntry* entry =
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NS_STATIC_CAST(propertyTableEntry*, hdr);
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nsPropertyElement *element =
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new nsPropertyElement(nsDependentCString(entry->mKey),
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nsDependentString(entry->mValue));
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if (!element)
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return PL_DHASH_STOP;
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|
NS_ADDREF(element);
|
|
propArray->InsertElementAt(element, i);
|
|
|
|
return PL_DHASH_NEXT;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::Enumerate(nsISimpleEnumerator** aResult)
|
|
{
|
|
nsCOMPtr<nsIBidirectionalEnumerator> iterator;
|
|
|
|
nsISupportsArray* propArray;
|
|
nsresult rv = NS_NewISupportsArray(&propArray);
|
|
if (rv != NS_OK)
|
|
return rv;
|
|
|
|
// Step through hash entries populating a transient array
|
|
PRUint32 n =
|
|
PL_DHashTableEnumerate(&mTable, AddElemToArray, (void *)propArray);
|
|
if ( n < mTable.entryCount )
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
return NS_NewArrayEnumerator(aResult, propArray);
|
|
}
|
|
|
|
|
|
PRInt32
|
|
nsPersistentProperties::Read()
|
|
{
|
|
PRUnichar c;
|
|
PRUint32 nRead;
|
|
nsresult ret;
|
|
|
|
ret = mIn->Read(&c, 0, 1, &nRead);
|
|
if (ret == NS_OK && nRead == 1) {
|
|
return c;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
PRInt32
|
|
nsPersistentProperties::SkipWhiteSpace(PRInt32 c)
|
|
{
|
|
while ((c >= 0) && IS_WHITE_SPACE(c)) {
|
|
c = Read();
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
PRInt32
|
|
nsPersistentProperties::SkipLine(PRInt32 c)
|
|
{
|
|
while ((c >= 0) && (c != '\r') && (c != '\n')) {
|
|
c = Read();
|
|
}
|
|
if (c == '\r') {
|
|
c = Read();
|
|
}
|
|
if (c == '\n') {
|
|
c = Read();
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// XXX Some day we'll unify the nsIPersistentProperties interface with
|
|
// nsIProperties, but until now...
|
|
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::Get(const char* prop, const nsIID & uuid, void* *result)
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::Set(const char* prop, nsISupports* value)
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::Undefine(const char* prop)
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::Has(const char* prop, PRBool *result)
|
|
{
|
|
propertyTableEntry *entry =
|
|
NS_STATIC_CAST(propertyTableEntry*,
|
|
PL_DHashTableOperate(&mTable, prop, PL_DHASH_LOOKUP));
|
|
|
|
*result = (entry && PL_DHASH_ENTRY_IS_BUSY(entry));
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPersistentProperties::GetKeys(PRUint32 *count, char ***keys)
|
|
{
|
|
return NS_ERROR_NOT_IMPLEMENTED;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// PropertyElement
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
NS_METHOD
|
|
nsPropertyElement::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
|
|
{
|
|
if (aOuter)
|
|
return NS_ERROR_NO_AGGREGATION;
|
|
nsPropertyElement* propElem = new nsPropertyElement();
|
|
if (propElem == nsnull)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
NS_ADDREF(propElem);
|
|
nsresult rv = propElem->QueryInterface(aIID, aResult);
|
|
NS_RELEASE(propElem);
|
|
return rv;
|
|
}
|
|
|
|
NS_IMPL_ISUPPORTS1(nsPropertyElement, nsIPropertyElement)
|
|
|
|
NS_IMETHODIMP
|
|
nsPropertyElement::GetKey(nsACString& aReturnKey)
|
|
{
|
|
aReturnKey = mKey;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPropertyElement::GetValue(nsAString& aReturnValue)
|
|
{
|
|
aReturnValue = mValue;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPropertyElement::SetKey(const nsACString& aKey)
|
|
{
|
|
mKey = aKey;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPropertyElement::SetValue(const nsAString& aValue)
|
|
{
|
|
mValue = aValue;
|
|
return NS_OK;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|