зеркало из https://github.com/mozilla/gecko-dev.git
988 строки
28 KiB
C++
988 строки
28 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <string>
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#include <vector>
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#include "base/basictypes.h"
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#include "prefapi.h"
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#include "prefapi_private_data.h"
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#include "prefread.h"
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#include "MainThreadUtils.h"
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#include "nsReadableUtils.h"
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#include "nsCRT.h"
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#define PL_ARENA_CONST_ALIGN_MASK 3
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#include "plarena.h"
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#ifdef _WIN32
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#include "windows.h"
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#endif /* _WIN32 */
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#include "plstr.h"
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#include "PLDHashTable.h"
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#include "plbase64.h"
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#include "mozilla/Logging.h"
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#include "prprf.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/dom/PContent.h"
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#include "nsQuickSort.h"
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#include "nsString.h"
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#include "nsPrintfCString.h"
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#include "prlink.h"
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using namespace mozilla;
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static void
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clearPrefEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
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{
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PrefHashEntry *pref = static_cast<PrefHashEntry *>(entry);
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if (pref->prefFlags.IsTypeString())
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{
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if (pref->defaultPref.stringVal)
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PL_strfree(pref->defaultPref.stringVal);
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if (pref->userPref.stringVal)
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PL_strfree(pref->userPref.stringVal);
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}
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// don't need to free this as it's allocated in memory owned by
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// gPrefNameArena
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pref->key = nullptr;
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memset(entry, 0, table->EntrySize());
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}
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static bool
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matchPrefEntry(const PLDHashEntryHdr* entry, const void* key)
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{
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const PrefHashEntry *prefEntry =
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static_cast<const PrefHashEntry*>(entry);
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if (prefEntry->key == key) return true;
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if (!prefEntry->key || !key) return false;
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const char *otherKey = reinterpret_cast<const char*>(key);
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return (strcmp(prefEntry->key, otherKey) == 0);
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}
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PLDHashTable* gHashTable;
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static PLArenaPool gPrefNameArena;
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bool gDirty = false;
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static struct CallbackNode* gCallbacks = nullptr;
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static bool gIsAnyPrefLocked = false;
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// These are only used during the call to pref_DoCallback
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static bool gCallbacksInProgress = false;
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static bool gShouldCleanupDeadNodes = false;
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static PLDHashTableOps pref_HashTableOps = {
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PLDHashTable::HashStringKey,
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matchPrefEntry,
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PLDHashTable::MoveEntryStub,
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clearPrefEntry,
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nullptr,
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};
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// PR_ALIGN_OF_WORD is only defined on some platforms. ALIGN_OF_WORD has
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// already been defined to PR_ALIGN_OF_WORD everywhere
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#ifndef PR_ALIGN_OF_WORD
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#define PR_ALIGN_OF_WORD PR_ALIGN_OF_POINTER
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#endif
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// making PrefName arena 8k for nice allocation
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#define PREFNAME_ARENA_SIZE 8192
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#define WORD_ALIGN_MASK (PR_ALIGN_OF_WORD - 1)
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// sanity checking
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#if (PR_ALIGN_OF_WORD & WORD_ALIGN_MASK) != 0
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#error "PR_ALIGN_OF_WORD must be a power of 2!"
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#endif
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// equivalent to strdup() - does no error checking,
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// we're assuming we're only called with a valid pointer
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static char *ArenaStrDup(const char* str, PLArenaPool* aArena)
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{
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void* mem;
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uint32_t len = strlen(str);
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PL_ARENA_ALLOCATE(mem, aArena, len+1);
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if (mem)
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memcpy(mem, str, len+1);
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return static_cast<char*>(mem);
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}
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/*---------------------------------------------------------------------------*/
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static bool pref_ValueChanged(PrefValue oldValue, PrefValue newValue, PrefType type);
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/* -- Privates */
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struct CallbackNode {
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char* domain;
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// If someone attempts to remove the node from the callback list while
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// pref_DoCallback is running, |func| is set to nullptr. Such nodes will
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// be removed at the end of pref_DoCallback.
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PrefChangedFunc func;
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void* data;
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struct CallbackNode* next;
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};
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/* -- Prototypes */
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static nsresult pref_DoCallback(const char* changed_pref);
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enum {
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kPrefSetDefault = 1,
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kPrefForceSet = 2,
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kPrefStickyDefault = 4,
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};
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static nsresult pref_HashPref(const char *key, PrefValue value, PrefType type, uint32_t flags);
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#define PREF_HASHTABLE_INITIAL_LENGTH 1024
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void PREF_Init()
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{
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if (!gHashTable) {
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gHashTable = new PLDHashTable(&pref_HashTableOps,
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sizeof(PrefHashEntry),
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PREF_HASHTABLE_INITIAL_LENGTH);
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PL_INIT_ARENA_POOL(&gPrefNameArena, "PrefNameArena",
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PREFNAME_ARENA_SIZE);
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}
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}
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/* Frees the callback list. */
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void PREF_Cleanup()
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{
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NS_ASSERTION(!gCallbacksInProgress,
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"PREF_Cleanup was called while gCallbacksInProgress is true!");
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struct CallbackNode* node = gCallbacks;
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struct CallbackNode* next_node;
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while (node)
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{
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next_node = node->next;
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PL_strfree(node->domain);
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free(node);
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node = next_node;
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}
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gCallbacks = nullptr;
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PREF_CleanupPrefs();
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}
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/* Frees up all the objects except the callback list. */
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void PREF_CleanupPrefs()
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{
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if (gHashTable) {
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delete gHashTable;
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gHashTable = nullptr;
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PL_FinishArenaPool(&gPrefNameArena);
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}
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}
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// note that this appends to aResult, and does not assign!
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static void str_escape(const char * original, nsAFlatCString& aResult)
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{
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/* JavaScript does not allow quotes, slashes, or line terminators inside
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* strings so we must escape them. ECMAScript defines four line
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* terminators, but we're only worrying about \r and \n here. We currently
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* feed our pref script to the JS interpreter as Latin-1 so we won't
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* encounter \u2028 (line separator) or \u2029 (paragraph separator).
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*
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* WARNING: There are hints that we may be moving to storing prefs
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* as utf8. If we ever feed them to the JS compiler as UTF8 then
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* we'll have to worry about the multibyte sequences that would be
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* interpreted as \u2028 and \u2029
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*/
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const char *p;
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if (original == nullptr)
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return;
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/* Paranoid worst case all slashes will free quickly */
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for (p=original; *p; ++p)
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{
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switch (*p)
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{
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case '\n':
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aResult.AppendLiteral("\\n");
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break;
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case '\r':
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aResult.AppendLiteral("\\r");
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break;
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case '\\':
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aResult.AppendLiteral("\\\\");
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break;
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case '\"':
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aResult.AppendLiteral("\\\"");
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break;
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default:
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aResult.Append(*p);
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break;
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}
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}
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}
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/*
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** External calls
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*/
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nsresult
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PREF_SetCharPref(const char *pref_name, const char *value, bool set_default)
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{
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if ((uint32_t)strlen(value) > MAX_PREF_LENGTH) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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PrefValue pref;
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pref.stringVal = (char*)value;
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return pref_HashPref(pref_name, pref, PrefType::String, set_default ? kPrefSetDefault : 0);
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}
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nsresult
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PREF_SetIntPref(const char *pref_name, int32_t value, bool set_default)
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{
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PrefValue pref;
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pref.intVal = value;
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return pref_HashPref(pref_name, pref, PrefType::Int, set_default ? kPrefSetDefault : 0);
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}
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nsresult
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PREF_SetBoolPref(const char *pref_name, bool value, bool set_default)
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{
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PrefValue pref;
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pref.boolVal = value;
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return pref_HashPref(pref_name, pref, PrefType::Bool, set_default ? kPrefSetDefault : 0);
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}
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enum WhichValue { DEFAULT_VALUE, USER_VALUE };
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static nsresult
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SetPrefValue(const char* aPrefName, const dom::PrefValue& aValue,
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WhichValue aWhich)
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{
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bool setDefault = (aWhich == DEFAULT_VALUE);
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switch (aValue.type()) {
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case dom::PrefValue::TnsCString:
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return PREF_SetCharPref(aPrefName, aValue.get_nsCString().get(),
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setDefault);
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case dom::PrefValue::Tint32_t:
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return PREF_SetIntPref(aPrefName, aValue.get_int32_t(),
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setDefault);
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case dom::PrefValue::Tbool:
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return PREF_SetBoolPref(aPrefName, aValue.get_bool(),
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setDefault);
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default:
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MOZ_CRASH();
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}
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}
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nsresult
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pref_SetPref(const dom::PrefSetting& aPref)
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{
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const char* prefName = aPref.name().get();
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const dom::MaybePrefValue& defaultValue = aPref.defaultValue();
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const dom::MaybePrefValue& userValue = aPref.userValue();
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nsresult rv;
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if (defaultValue.type() == dom::MaybePrefValue::TPrefValue) {
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rv = SetPrefValue(prefName, defaultValue.get_PrefValue(), DEFAULT_VALUE);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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if (userValue.type() == dom::MaybePrefValue::TPrefValue) {
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rv = SetPrefValue(prefName, userValue.get_PrefValue(), USER_VALUE);
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} else {
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rv = PREF_ClearUserPref(prefName);
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}
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// NB: we should never try to clear a default value, that doesn't
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// make sense
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return rv;
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}
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UniquePtr<char*[]>
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pref_savePrefs(PLDHashTable* aTable)
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{
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auto savedPrefs = MakeUnique<char*[]>(aTable->EntryCount());
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memset(savedPrefs.get(), 0, aTable->EntryCount() * sizeof(char*));
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int32_t j = 0;
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for (auto iter = aTable->Iter(); !iter.Done(); iter.Next()) {
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auto pref = static_cast<PrefHashEntry*>(iter.Get());
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nsAutoCString prefValue;
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nsAutoCString prefPrefix;
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prefPrefix.AssignLiteral("user_pref(\"");
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// where we're getting our pref from
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PrefValue* sourcePref;
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if (pref->prefFlags.HasUserValue() &&
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(pref_ValueChanged(pref->defaultPref,
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pref->userPref,
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pref->prefFlags.GetPrefType()) ||
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!(pref->prefFlags.HasDefault()) ||
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pref->prefFlags.HasStickyDefault())) {
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sourcePref = &pref->userPref;
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} else {
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// do not save default prefs that haven't changed
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continue;
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}
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// strings are in quotes!
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if (pref->prefFlags.IsTypeString()) {
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prefValue = '\"';
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str_escape(sourcePref->stringVal, prefValue);
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prefValue += '\"';
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} else if (pref->prefFlags.IsTypeInt()) {
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prefValue.AppendInt(sourcePref->intVal);
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} else if (pref->prefFlags.IsTypeBool()) {
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prefValue = (sourcePref->boolVal) ? "true" : "false";
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}
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nsAutoCString prefName;
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str_escape(pref->key, prefName);
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savedPrefs[j++] = ToNewCString(prefPrefix +
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prefName +
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NS_LITERAL_CSTRING("\", ") +
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prefValue +
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NS_LITERAL_CSTRING(");"));
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}
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return savedPrefs;
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}
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bool
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pref_EntryHasAdvisablySizedValues(PrefHashEntry* aHashEntry)
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{
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if (aHashEntry->prefFlags.GetPrefType() != PrefType::String) {
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return true;
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}
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char* stringVal;
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if (aHashEntry->prefFlags.HasDefault()) {
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stringVal = aHashEntry->defaultPref.stringVal;
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if (strlen(stringVal) > MAX_ADVISABLE_PREF_LENGTH) {
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return false;
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}
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}
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if (aHashEntry->prefFlags.HasUserValue()) {
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stringVal = aHashEntry->userPref.stringVal;
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if (strlen(stringVal) > MAX_ADVISABLE_PREF_LENGTH) {
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return false;
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}
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}
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return true;
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}
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static void
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GetPrefValueFromEntry(PrefHashEntry *aHashEntry, dom::PrefSetting* aPref,
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WhichValue aWhich)
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{
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PrefValue* value;
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dom::PrefValue* settingValue;
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if (aWhich == USER_VALUE) {
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value = &aHashEntry->userPref;
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aPref->userValue() = dom::PrefValue();
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settingValue = &aPref->userValue().get_PrefValue();
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} else {
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value = &aHashEntry->defaultPref;
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aPref->defaultValue() = dom::PrefValue();
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settingValue = &aPref->defaultValue().get_PrefValue();
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}
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switch (aHashEntry->prefFlags.GetPrefType()) {
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case PrefType::String:
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*settingValue = nsDependentCString(value->stringVal);
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return;
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case PrefType::Int:
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*settingValue = value->intVal;
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return;
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case PrefType::Bool:
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*settingValue = !!value->boolVal;
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return;
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default:
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MOZ_CRASH();
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}
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}
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void
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pref_GetPrefFromEntry(PrefHashEntry *aHashEntry, dom::PrefSetting* aPref)
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{
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aPref->name() = aHashEntry->key;
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if (aHashEntry->prefFlags.HasDefault()) {
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GetPrefValueFromEntry(aHashEntry, aPref, DEFAULT_VALUE);
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} else {
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aPref->defaultValue() = null_t();
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}
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if (aHashEntry->prefFlags.HasUserValue()) {
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GetPrefValueFromEntry(aHashEntry, aPref, USER_VALUE);
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} else {
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aPref->userValue() = null_t();
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}
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MOZ_ASSERT(aPref->defaultValue().type() == dom::MaybePrefValue::Tnull_t ||
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aPref->userValue().type() == dom::MaybePrefValue::Tnull_t ||
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(aPref->defaultValue().get_PrefValue().type() ==
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aPref->userValue().get_PrefValue().type()));
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}
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int
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pref_CompareStrings(const void *v1, const void *v2, void *unused)
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{
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char *s1 = *(char**) v1;
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char *s2 = *(char**) v2;
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if (!s1)
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{
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if (!s2)
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return 0;
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else
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return -1;
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}
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else if (!s2)
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return 1;
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else
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return strcmp(s1, s2);
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}
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bool PREF_HasUserPref(const char *pref_name)
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{
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if (!gHashTable)
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return false;
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PrefHashEntry *pref = pref_HashTableLookup(pref_name);
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return pref && pref->prefFlags.HasUserValue();
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}
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nsresult
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PREF_CopyCharPref(const char *pref_name, char ** return_buffer, bool get_default)
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{
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if (!gHashTable)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult rv = NS_ERROR_UNEXPECTED;
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char* stringVal;
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PrefHashEntry* pref = pref_HashTableLookup(pref_name);
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if (pref && (pref->prefFlags.IsTypeString())) {
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if (get_default || pref->prefFlags.IsLocked() || !pref->prefFlags.HasUserValue()) {
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stringVal = pref->defaultPref.stringVal;
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} else {
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stringVal = pref->userPref.stringVal;
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}
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if (stringVal) {
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*return_buffer = NS_strdup(stringVal);
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rv = NS_OK;
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}
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}
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return rv;
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}
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nsresult PREF_GetIntPref(const char *pref_name,int32_t * return_int, bool get_default)
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{
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if (!gHashTable)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult rv = NS_ERROR_UNEXPECTED;
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PrefHashEntry* pref = pref_HashTableLookup(pref_name);
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if (pref && (pref->prefFlags.IsTypeInt())) {
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if (get_default || pref->prefFlags.IsLocked() || !pref->prefFlags.HasUserValue()) {
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int32_t tempInt = pref->defaultPref.intVal;
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/* check to see if we even had a default */
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if (!pref->prefFlags.HasDefault()) {
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return NS_ERROR_UNEXPECTED;
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}
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*return_int = tempInt;
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} else {
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*return_int = pref->userPref.intVal;
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}
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rv = NS_OK;
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}
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return rv;
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}
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nsresult PREF_GetBoolPref(const char *pref_name, bool * return_value, bool get_default)
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{
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if (!gHashTable)
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return NS_ERROR_NOT_INITIALIZED;
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nsresult rv = NS_ERROR_UNEXPECTED;
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PrefHashEntry* pref = pref_HashTableLookup(pref_name);
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//NS_ASSERTION(pref, pref_name);
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if (pref && (pref->prefFlags.IsTypeBool())) {
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if (get_default || pref->prefFlags.IsLocked() || !pref->prefFlags.HasUserValue()) {
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bool tempBool = pref->defaultPref.boolVal;
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/* check to see if we even had a default */
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if (pref->prefFlags.HasDefault()) {
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*return_value = tempBool;
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|
rv = NS_OK;
|
|
}
|
|
} else {
|
|
*return_value = pref->userPref.boolVal;
|
|
rv = NS_OK;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
nsresult
|
|
PREF_DeleteBranch(const char *branch_name)
|
|
{
|
|
#ifndef MOZ_B2G
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
#endif
|
|
|
|
int len = (int)strlen(branch_name);
|
|
|
|
if (!gHashTable)
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
|
|
/* The following check insures that if the branch name already has a "."
|
|
* at the end, we don't end up with a "..". This fixes an incompatibility
|
|
* between nsIPref, which needs the period added, and nsIPrefBranch which
|
|
* does not. When nsIPref goes away this function should be fixed to
|
|
* never add the period at all.
|
|
*/
|
|
nsAutoCString branch_dot(branch_name);
|
|
if ((len > 1) && branch_name[len - 1] != '.')
|
|
branch_dot += '.';
|
|
|
|
/* Delete a branch. Used for deleting mime types */
|
|
const char *to_delete = branch_dot.get();
|
|
MOZ_ASSERT(to_delete);
|
|
len = strlen(to_delete);
|
|
for (auto iter = gHashTable->Iter(); !iter.Done(); iter.Next()) {
|
|
auto entry = static_cast<PrefHashEntry*>(iter.Get());
|
|
|
|
/* note if we're deleting "ldap" then we want to delete "ldap.xxx"
|
|
and "ldap" (if such a leaf node exists) but not "ldap_1.xxx" */
|
|
if (PL_strncmp(entry->key, to_delete, (uint32_t) len) == 0 ||
|
|
(len-1 == (int)strlen(entry->key) &&
|
|
PL_strncmp(entry->key, to_delete, (uint32_t)(len-1)) == 0)) {
|
|
iter.Remove();
|
|
}
|
|
}
|
|
|
|
gDirty = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
nsresult
|
|
PREF_ClearUserPref(const char *pref_name)
|
|
{
|
|
if (!gHashTable)
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
|
|
PrefHashEntry* pref = pref_HashTableLookup(pref_name);
|
|
if (pref && pref->prefFlags.HasUserValue()) {
|
|
pref->prefFlags.SetHasUserValue(false);
|
|
|
|
if (!pref->prefFlags.HasDefault()) {
|
|
gHashTable->RemoveEntry(pref);
|
|
}
|
|
|
|
pref_DoCallback(pref_name);
|
|
gDirty = true;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
PREF_ClearAllUserPrefs()
|
|
{
|
|
#ifndef MOZ_B2G
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
#endif
|
|
|
|
if (!gHashTable)
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
|
|
std::vector<std::string> prefStrings;
|
|
for (auto iter = gHashTable->Iter(); !iter.Done(); iter.Next()) {
|
|
auto pref = static_cast<PrefHashEntry*>(iter.Get());
|
|
|
|
if (pref->prefFlags.HasUserValue()) {
|
|
prefStrings.push_back(std::string(pref->key));
|
|
|
|
pref->prefFlags.SetHasUserValue(false);
|
|
if (!pref->prefFlags.HasDefault()) {
|
|
iter.Remove();
|
|
}
|
|
}
|
|
}
|
|
|
|
for (std::string& prefString : prefStrings) {
|
|
pref_DoCallback(prefString.c_str());
|
|
}
|
|
|
|
gDirty = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult PREF_LockPref(const char *key, bool lockit)
|
|
{
|
|
if (!gHashTable)
|
|
return NS_ERROR_NOT_INITIALIZED;
|
|
|
|
PrefHashEntry* pref = pref_HashTableLookup(key);
|
|
if (!pref)
|
|
return NS_ERROR_UNEXPECTED;
|
|
|
|
if (lockit) {
|
|
if (!pref->prefFlags.IsLocked()) {
|
|
pref->prefFlags.SetLocked(true);
|
|
gIsAnyPrefLocked = true;
|
|
pref_DoCallback(key);
|
|
}
|
|
} else {
|
|
if (pref->prefFlags.IsLocked()) {
|
|
pref->prefFlags.SetLocked(false);
|
|
pref_DoCallback(key);
|
|
}
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
/*
|
|
* Hash table functions
|
|
*/
|
|
static bool pref_ValueChanged(PrefValue oldValue, PrefValue newValue, PrefType type)
|
|
{
|
|
bool changed = true;
|
|
switch(type) {
|
|
case PrefType::String:
|
|
if (oldValue.stringVal && newValue.stringVal) {
|
|
changed = (strcmp(oldValue.stringVal, newValue.stringVal) != 0);
|
|
}
|
|
break;
|
|
case PrefType::Int:
|
|
changed = oldValue.intVal != newValue.intVal;
|
|
break;
|
|
case PrefType::Bool:
|
|
changed = oldValue.boolVal != newValue.boolVal;
|
|
break;
|
|
case PrefType::Invalid:
|
|
default:
|
|
changed = false;
|
|
break;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
/*
|
|
* Overwrite the type and value of an existing preference. Caller must
|
|
* ensure that they are not changing the type of a preference that has
|
|
* a default value.
|
|
*/
|
|
static PrefTypeFlags pref_SetValue(PrefValue* existingValue, PrefTypeFlags flags,
|
|
PrefValue newValue, PrefType newType)
|
|
{
|
|
if (flags.IsTypeString() && existingValue->stringVal) {
|
|
PL_strfree(existingValue->stringVal);
|
|
}
|
|
flags.SetPrefType(newType);
|
|
if (flags.IsTypeString()) {
|
|
PR_ASSERT(newValue.stringVal);
|
|
existingValue->stringVal = newValue.stringVal ? PL_strdup(newValue.stringVal) : nullptr;
|
|
}
|
|
else {
|
|
*existingValue = newValue;
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
PrefHashEntry* pref_HashTableLookup(const char *key)
|
|
{
|
|
#ifndef MOZ_B2G
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
#endif
|
|
|
|
return static_cast<PrefHashEntry*>(gHashTable->Search(key));
|
|
}
|
|
|
|
nsresult pref_HashPref(const char *key, PrefValue value, PrefType type, uint32_t flags)
|
|
{
|
|
#ifndef MOZ_B2G
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
#endif
|
|
|
|
if (!gHashTable)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
auto pref = static_cast<PrefHashEntry*>(gHashTable->Add(key, fallible));
|
|
if (!pref)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
// new entry, better initialize
|
|
if (!pref->key) {
|
|
|
|
// initialize the pref entry
|
|
pref->prefFlags.Reset().SetPrefType(type);
|
|
pref->key = ArenaStrDup(key, &gPrefNameArena);
|
|
memset(&pref->defaultPref, 0, sizeof(pref->defaultPref));
|
|
memset(&pref->userPref, 0, sizeof(pref->userPref));
|
|
} else if (pref->prefFlags.HasDefault() && !pref->prefFlags.IsPrefType(type)) {
|
|
NS_WARNING(nsPrintfCString("Trying to overwrite value of default pref %s with the wrong type!", key).get());
|
|
return NS_ERROR_UNEXPECTED;
|
|
}
|
|
|
|
bool valueChanged = false;
|
|
if (flags & kPrefSetDefault) {
|
|
if (!pref->prefFlags.IsLocked()) {
|
|
/* ?? change of semantics? */
|
|
if (pref_ValueChanged(pref->defaultPref, value, type) ||
|
|
!pref->prefFlags.HasDefault()) {
|
|
pref->prefFlags = pref_SetValue(&pref->defaultPref, pref->prefFlags, value, type).SetHasDefault(true);
|
|
if (flags & kPrefStickyDefault) {
|
|
pref->prefFlags.SetHasStickyDefault(true);
|
|
}
|
|
if (!pref->prefFlags.HasUserValue()) {
|
|
valueChanged = true;
|
|
}
|
|
}
|
|
// What if we change the default to be the same as the user value?
|
|
// Should we clear the user value?
|
|
}
|
|
} else {
|
|
/* If new value is same as the default value and it's not a "sticky"
|
|
pref, then un-set the user value.
|
|
Otherwise, set the user value only if it has changed */
|
|
if ((pref->prefFlags.HasDefault()) &&
|
|
!(pref->prefFlags.HasStickyDefault()) &&
|
|
!pref_ValueChanged(pref->defaultPref, value, type) &&
|
|
!(flags & kPrefForceSet)) {
|
|
if (pref->prefFlags.HasUserValue()) {
|
|
/* XXX should we free a user-set string value if there is one? */
|
|
pref->prefFlags.SetHasUserValue(false);
|
|
if (!pref->prefFlags.IsLocked()) {
|
|
gDirty = true;
|
|
valueChanged = true;
|
|
}
|
|
}
|
|
} else if (!pref->prefFlags.HasUserValue() ||
|
|
!pref->prefFlags.IsPrefType(type) ||
|
|
pref_ValueChanged(pref->userPref, value, type) ) {
|
|
pref->prefFlags = pref_SetValue(&pref->userPref, pref->prefFlags, value, type).SetHasUserValue(true);
|
|
if (!pref->prefFlags.IsLocked()) {
|
|
gDirty = true;
|
|
valueChanged = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (valueChanged) {
|
|
return pref_DoCallback(key);
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
size_t
|
|
pref_SizeOfPrivateData(MallocSizeOf aMallocSizeOf)
|
|
{
|
|
size_t n = PL_SizeOfArenaPoolExcludingPool(&gPrefNameArena, aMallocSizeOf);
|
|
for (struct CallbackNode* node = gCallbacks; node; node = node->next) {
|
|
n += aMallocSizeOf(node);
|
|
n += aMallocSizeOf(node->domain);
|
|
}
|
|
return n;
|
|
}
|
|
|
|
PrefType
|
|
PREF_GetPrefType(const char *pref_name)
|
|
{
|
|
if (gHashTable) {
|
|
PrefHashEntry* pref = pref_HashTableLookup(pref_name);
|
|
if (pref) {
|
|
return pref->prefFlags.GetPrefType();
|
|
}
|
|
}
|
|
return PrefType::Invalid;
|
|
}
|
|
|
|
/* -- */
|
|
|
|
bool
|
|
PREF_PrefIsLocked(const char *pref_name)
|
|
{
|
|
bool result = false;
|
|
if (gIsAnyPrefLocked && gHashTable) {
|
|
PrefHashEntry* pref = pref_HashTableLookup(pref_name);
|
|
if (pref && pref->prefFlags.IsLocked()) {
|
|
result = true;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Adds a node to the beginning of the callback list. */
|
|
void
|
|
PREF_RegisterCallback(const char *pref_node,
|
|
PrefChangedFunc callback,
|
|
void * instance_data)
|
|
{
|
|
NS_PRECONDITION(pref_node, "pref_node must not be nullptr");
|
|
NS_PRECONDITION(callback, "callback must not be nullptr");
|
|
|
|
struct CallbackNode* node = (struct CallbackNode*) malloc(sizeof(struct CallbackNode));
|
|
if (node)
|
|
{
|
|
node->domain = PL_strdup(pref_node);
|
|
node->func = callback;
|
|
node->data = instance_data;
|
|
node->next = gCallbacks;
|
|
gCallbacks = node;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* Removes |node| from gCallbacks list.
|
|
Returns the node after the deleted one. */
|
|
struct CallbackNode*
|
|
pref_RemoveCallbackNode(struct CallbackNode* node,
|
|
struct CallbackNode* prev_node)
|
|
{
|
|
NS_PRECONDITION(!prev_node || prev_node->next == node, "invalid params");
|
|
NS_PRECONDITION(prev_node || gCallbacks == node, "invalid params");
|
|
|
|
NS_ASSERTION(!gCallbacksInProgress,
|
|
"modifying the callback list while gCallbacksInProgress is true");
|
|
|
|
struct CallbackNode* next_node = node->next;
|
|
if (prev_node)
|
|
prev_node->next = next_node;
|
|
else
|
|
gCallbacks = next_node;
|
|
PL_strfree(node->domain);
|
|
free(node);
|
|
return next_node;
|
|
}
|
|
|
|
/* Deletes a node from the callback list or marks it for deletion. */
|
|
nsresult
|
|
PREF_UnregisterCallback(const char *pref_node,
|
|
PrefChangedFunc callback,
|
|
void * instance_data)
|
|
{
|
|
nsresult rv = NS_ERROR_FAILURE;
|
|
struct CallbackNode* node = gCallbacks;
|
|
struct CallbackNode* prev_node = nullptr;
|
|
|
|
while (node != nullptr)
|
|
{
|
|
if ( node->func == callback &&
|
|
node->data == instance_data &&
|
|
strcmp(node->domain, pref_node) == 0)
|
|
{
|
|
if (gCallbacksInProgress)
|
|
{
|
|
// postpone the node removal until after
|
|
// gCallbacks enumeration is finished.
|
|
node->func = nullptr;
|
|
gShouldCleanupDeadNodes = true;
|
|
prev_node = node;
|
|
node = node->next;
|
|
}
|
|
else
|
|
{
|
|
node = pref_RemoveCallbackNode(node, prev_node);
|
|
}
|
|
rv = NS_OK;
|
|
}
|
|
else
|
|
{
|
|
prev_node = node;
|
|
node = node->next;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static nsresult pref_DoCallback(const char* changed_pref)
|
|
{
|
|
nsresult rv = NS_OK;
|
|
struct CallbackNode* node;
|
|
|
|
bool reentered = gCallbacksInProgress;
|
|
gCallbacksInProgress = true;
|
|
// Nodes must not be deleted while gCallbacksInProgress is true.
|
|
// Nodes that need to be deleted are marked for deletion by nulling
|
|
// out the |func| pointer. We release them at the end of this function
|
|
// if we haven't reentered.
|
|
|
|
for (node = gCallbacks; node != nullptr; node = node->next)
|
|
{
|
|
if ( node->func &&
|
|
PL_strncmp(changed_pref,
|
|
node->domain,
|
|
strlen(node->domain)) == 0 )
|
|
{
|
|
(*node->func) (changed_pref, node->data);
|
|
}
|
|
}
|
|
|
|
gCallbacksInProgress = reentered;
|
|
|
|
if (gShouldCleanupDeadNodes && !gCallbacksInProgress)
|
|
{
|
|
struct CallbackNode* prev_node = nullptr;
|
|
node = gCallbacks;
|
|
|
|
while (node != nullptr)
|
|
{
|
|
if (!node->func)
|
|
{
|
|
node = pref_RemoveCallbackNode(node, prev_node);
|
|
}
|
|
else
|
|
{
|
|
prev_node = node;
|
|
node = node->next;
|
|
}
|
|
}
|
|
gShouldCleanupDeadNodes = false;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
void PREF_ReaderCallback(void *closure,
|
|
const char *pref,
|
|
PrefValue value,
|
|
PrefType type,
|
|
bool isDefault,
|
|
bool isStickyDefault)
|
|
|
|
{
|
|
uint32_t flags = 0;
|
|
if (isDefault) {
|
|
flags |= kPrefSetDefault;
|
|
if (isStickyDefault) {
|
|
flags |= kPrefStickyDefault;
|
|
}
|
|
} else {
|
|
flags |= kPrefForceSet;
|
|
}
|
|
pref_HashPref(pref, value, type, flags);
|
|
}
|