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|
/*
File: CASettingsStorage.cpp
Abstract: CASettingsStorage.h
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Inc. ("Apple") in consideration of your agreement to the following
terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
implied, are granted by Apple herein, including but not limited to any
patent rights that may be infringed by your derivative works or by other
works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
//==================================================================================================
// Includes
//==================================================================================================
// Self Include
#include "CASettingsStorage.h"
// PublicUtility Includes
#include "CAAutoDisposer.h"
#include "CACFArray.h"
#include "CACFData.h"
#include "CACFDictionary.h"
#include "CACFDistributedNotification.h"
#include "CACFNumber.h"
// Stamdard Library Includes
#include <string.h>
#include <sys/fcntl.h>
//==================================================================================================
// CASettingsStorage
//==================================================================================================
CASettingsStorage::CASettingsStorage(const char* inSettingsFilePath, mode_t inSettingsFileAccessMode, CFPropertyListFormat inSettingsCacheFormat, bool inIsSingleProcessOnly, bool inIsReadOnly)
:
mSettingsFilePath(NULL),
mSettingsFileAccessMode(inSettingsFileAccessMode),
mSettingsCache(CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks)),
mSettingsCacheFormat(inSettingsCacheFormat),
mSettingsCacheTime(),
mSettingsCacheForceRefresh(true),
mIsSingleProcessOnly(inIsSingleProcessOnly),
mIsReadOnly(inIsReadOnly)
{
size_t theLength = strlen(inSettingsFilePath);
mSettingsFilePath = new char[theLength + 2];
strlcpy(mSettingsFilePath, inSettingsFilePath, theLength + 2);
mSettingsCacheTime.tv_sec = 0;
mSettingsCacheTime.tv_nsec = 0;
mSettingsCacheForceRefresh = true;
}
CASettingsStorage::~CASettingsStorage()
{
delete[] mSettingsFilePath;
if(mSettingsCache != NULL)
{
CFRelease(mSettingsCache);
}
}
UInt32 CASettingsStorage::GetNumberKeys() const
{
// make sure our cache is up to date
const_cast<CASettingsStorage*>(this)->RefreshSettings();
return ToUInt32(CFDictionaryGetCount(mSettingsCache));
}
void CASettingsStorage::GetKeys(UInt32 inNumberKeys, UInt32& outNumberKeys, CFStringRef* outKeys) const
{
// make sure our cache is up to date
const_cast<CASettingsStorage*>(this)->RefreshSettings();
CFDictionaryGetKeysAndValues(mSettingsCache, reinterpret_cast<const void**>(outKeys), NULL);
outNumberKeys = inNumberKeys;
}
void CASettingsStorage::CopyBoolValue(CFStringRef inKey, bool& outValue, bool inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// bools can be made from either CFBooleans or CFNumbers
if(CFGetTypeID(theValue) == CFBooleanGetTypeID())
{
// get the return value from the CF object
outValue = CFBooleanGetValue(static_cast<CFBooleanRef>(theValue));
}
else if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the numeric value
SInt32 theNumericValue = 0;
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &theNumericValue);
// non-zero indicates true
outValue = theNumericValue != 0;
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopySInt32Value(CFStringRef inKey, SInt32& outValue, SInt32 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopyUInt32Value(CFStringRef inKey, UInt32& outValue, UInt32 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt32Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopySInt64Value(CFStringRef inKey, SInt64& outValue, SInt64 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt64Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopyUInt64Value(CFStringRef inKey, UInt64& outValue, UInt64 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberSInt64Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopyFloat32Value(CFStringRef inKey, Float32& outValue, Float32 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberFloat32Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopyFloat64Value(CFStringRef inKey, Float64& outValue, Float64 inDefaultValue) const
{
// initialize the return value
outValue = inDefaultValue;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, NULL);
// for this type, NULL is an invalid value
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// get the return value from the CF object
CFNumberGetValue(static_cast<CFNumberRef>(theValue), kCFNumberFloat64Type, &outValue);
}
// release the value since we aren't returning it
CFRelease(theValue);
}
}
void CASettingsStorage::CopyNumberValue(CFStringRef inKey, CFNumberRef& outValue, CFNumberRef inDefaultValue) const
{
// initialize the return value
outValue = NULL;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, inDefaultValue);
// for this type, NULL is a valid value, but requires less work
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFNumberGetTypeID())
{
// set the return value to the CF object we are returning
outValue = static_cast<CFNumberRef>(theValue);
}
else
{
// release the value since we aren't returning it
CFRelease(theValue);
// set the return value to the default value
outValue = inDefaultValue;
// and retain it
CFRetain(outValue);
}
}
}
void CASettingsStorage::CopyStringValue(CFStringRef inKey, CFStringRef& outValue, CFStringRef inDefaultValue) const
{
// initialize the return value
outValue = NULL;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, inDefaultValue);
// for this type, NULL is a valid value, but requires less work
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFStringGetTypeID())
{
// set the return value to the CF object we are returning
outValue = static_cast<CFStringRef>(theValue);
}
else
{
// release the value since we aren't returning it
CFRelease(theValue);
// set the return value to the default value
outValue = inDefaultValue;
// and retain it
CFRetain(outValue);
}
}
}
void CASettingsStorage::CopyArrayValue(CFStringRef inKey, CFArrayRef& outValue, CFArrayRef inDefaultValue) const
{
// initialize the return value
outValue = NULL;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, inDefaultValue);
// for this type, NULL is a valid value, but requires less work
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFArrayGetTypeID())
{
// set the return value to the CF object we are returning
outValue = static_cast<CFArrayRef>(theValue);
}
else
{
// release the value since we aren't returning it
CFRelease(theValue);
// set the return value to the default value
outValue = inDefaultValue;
// and retain it
CFRetain(outValue);
}
}
}
void CASettingsStorage::CopyDictionaryValue(CFStringRef inKey, CFDictionaryRef& outValue, CFDictionaryRef inDefaultValue) const
{
// initialize the return value
outValue = NULL;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, inDefaultValue);
// for this type, NULL is a valid value, but requires less work
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFDictionaryGetTypeID())
{
// set the return value to the CF object we are returning
outValue = static_cast<CFDictionaryRef>(theValue);
}
else
{
// release the value since we aren't returning it
CFRelease(theValue);
// set the return value to the default value
outValue = inDefaultValue;
// and retain it
CFRetain(outValue);
}
}
}
void CASettingsStorage::CopyDataValue(CFStringRef inKey, CFDataRef& outValue, CFDataRef inDefaultValue) const
{
// initialize the return value
outValue = NULL;
// get the raw value
CFTypeRef theValue = NULL;
CopyCFTypeValue(inKey, theValue, inDefaultValue);
// for this type, NULL is a valid value, but requires less work
if(theValue != NULL)
{
// make sure we are dealing with the right kind of CF object
if(CFGetTypeID(theValue) == CFDataGetTypeID())
{
// set the return value to the CF object we are returning
outValue = static_cast<CFDataRef>(theValue);
}
else
{
// release the value since we aren't returning it
CFRelease(theValue);
// set the return value to the default value
outValue = inDefaultValue;
// and retain it
CFRetain(outValue);
}
}
}
void CASettingsStorage::CopyCFTypeValue(CFStringRef inKey, CFTypeRef& outValue, CFTypeRef inDefaultValue) const
{
// make sure our cache is up to date
const_cast<CASettingsStorage*>(this)->RefreshSettings();
// check to see if we have a value for the given key
if(!CFDictionaryGetValueIfPresent(mSettingsCache, inKey, &outValue))
{
// the key wasn't in the cache, so return the default value
outValue = inDefaultValue;
}
// make sure we retain the return value
if(outValue != NULL)
{
CFRetain(outValue);
}
}
void CASettingsStorage::SetSInt32Value(CFStringRef inKey, SInt32 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetUInt32Value(CFStringRef inKey, UInt32 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetSInt64Value(CFStringRef inKey, SInt64 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetUInt64Value(CFStringRef inKey, UInt64 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetFloat32Value(CFStringRef inKey, Float32 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetFloat64Value(CFStringRef inKey, Float64 inValue)
{
CACFNumber theValue(inValue);
SetCFTypeValue(inKey, theValue.GetCFNumber());
}
void CASettingsStorage::SetNumberValue(CFStringRef inKey, CFNumberRef inValue)
{
SetCFTypeValue(inKey, inValue);
}
void CASettingsStorage::SetStringValue(CFStringRef inKey, CFStringRef inValue)
{
SetCFTypeValue(inKey, inValue);
}
void CASettingsStorage::SetArrayValue(CFStringRef inKey, CFArrayRef inValue)
{
SetCFTypeValue(inKey, inValue);
}
void CASettingsStorage::SetDictionaryValue(CFStringRef inKey, CFDictionaryRef inValue)
{
SetCFTypeValue(inKey, inValue);
}
void CASettingsStorage::SetDataValue(CFStringRef inKey, CFDataRef inValue)
{
SetCFTypeValue(inKey, inValue);
}
void CASettingsStorage::SetCFTypeValue(CFStringRef inKey, CFTypeRef inValue)
{
// make sure our cache is up to date
RefreshSettings();
// add the new key/value to the dictionary
CFDictionarySetValue(mSettingsCache, inKey, inValue);
// write the settings to the file
SaveSettings();
}
void CASettingsStorage::RemoveValue(CFStringRef inKey)
{
// make sure our cache is up to date
RefreshSettings();
// remove the given key
CFDictionaryRemoveValue(mSettingsCache, inKey);
// write the settings to the file
SaveSettings();
}
void CASettingsStorage::RemoveAllValues()
{
// make sure our cache is up to date
RefreshSettings();
// remove the given key
CFDictionaryRemoveAllValues(mSettingsCache);
// write the settings to the file
SaveSettings();
}
void CASettingsStorage::SendNotification(CFStringRef inName, CFDictionaryRef inData, bool inPostToAllSessions) const
{
CACFDistributedNotification::PostNotification(inName, inData, inPostToAllSessions);
}
void CASettingsStorage::ForceRefresh()
{
mSettingsCacheForceRefresh = true;
}
inline bool operator<(const struct timespec& inX, const struct timespec& inY)
{
return ((inX.tv_sec < inY.tv_sec) || ((inX.tv_sec == inY.tv_sec) && (inX.tv_nsec < inY.tv_nsec)));
}
void CASettingsStorage::RefreshSettings()
{
// if this storage is only supporting a single process, there is no need to hit the disk unless
// required to by it being the first time or if the refresh is specifically forced for some reason
if(!mIsSingleProcessOnly || (mSettingsCache == NULL) || ((mSettingsCacheTime.tv_sec == 0) && (mSettingsCacheTime.tv_nsec == 0)) || mSettingsCacheForceRefresh)
{
// first, we need to stat the file to check the mod date, this has the side effect of also
// telling us if the file exisits
struct stat theFileInfo;
int theStatError = stat(mSettingsFilePath, &theFileInfo);
// we use this boolean to make error recovery easier since we need a case for when there's no file anyway
bool theSettingsWereCached = false;
bool theSettingsNeedSaving = true;
if(theStatError == 0)
{
// stat says there is something there, only have to do work if we either don't have a cache or the cache is out of date
if((mSettingsCache == NULL) || (mSettingsCacheTime < theFileInfo.st_mtimespec) || mSettingsCacheForceRefresh)
{
// open the file
FILE* theFile = fopen(mSettingsFilePath, "r");
if(theFile != NULL)
{
// lock the file (this call blocks until the lock is taken)
int theError = flock(fileno(theFile), LOCK_EX);
if(theError == 0)
{
// get the length of the file
fseek(theFile, 0, SEEK_END);
size_t theFileLength = static_cast<size_t>(ftell(theFile));
fseek(theFile, 0, SEEK_SET);
if(theFileLength > 0)
{
// allocate a block of memory to hold the data in the file
CAAutoFree<Byte> theRawFileData(theFileLength);
// read all the data in
fread(static_cast<Byte*>(theRawFileData), theFileLength, 1, theFile);
// release the lock
flock(fileno(theFile), LOCK_UN);
// put it into a CFData object
CACFData theRawFileDataCFData(static_cast<Byte*>(theRawFileData), static_cast<UInt32>(theFileLength));
// get rid of the existing cache
if(mSettingsCache != NULL)
{
CFRelease(mSettingsCache);
mSettingsCache = NULL;
}
// parse the data as a property list
mSettingsCache = (CFMutableDictionaryRef)CFPropertyListCreateWithData(NULL, theRawFileDataCFData.GetCFData(), kCFPropertyListMutableContainersAndLeaves, NULL, NULL);
// check to be sure we parsed a plist out of the file
if(mSettingsCache != NULL)
{
// save the date of the cache
mSettingsCacheTime = theFileInfo.st_mtimespec;
// mark that we're done
theSettingsWereCached = true;
theSettingsNeedSaving = false;
}
}
}
// close the file
fclose(theFile);
mSettingsCacheForceRefresh = false;
}
}
else
{
// nothing to do since the file was older than the cached data
theSettingsNeedSaving = false;
theSettingsWereCached = true;
}
}
// if there was a failure, we need to clean up
if((theStatError != 0) || theSettingsNeedSaving || !theSettingsWereCached)
{
// we get here if either there isn't a file or something wacky happenned while parsing it
// so, make sure we have a valid cache dictionary
if(mSettingsCache == NULL)
{
mSettingsCache = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}
mSettingsCacheTime.tv_sec = 0;
mSettingsCacheTime.tv_nsec = 0;
if((theStatError != 0) || theSettingsNeedSaving)
{
SaveSettings();
}
}
}
}
void CASettingsStorage::SaveSettings()
{
if(!mIsReadOnly && (mSettingsCache != NULL))
{
// make a CFData that contains the new settings
CACFData theNewRawPrefsCFData(CFPropertyListCreateData(NULL, mSettingsCache, mSettingsCacheFormat, 0, NULL), true);
// open the file for writing
FILE* theFile = fopen(mSettingsFilePath, "w+");
if(theFile != NULL)
{
// lock the file (this call blocks until the lock is taken)
int theError = flock(fileno(theFile), LOCK_EX);
if(theError == 0)
{
// set the file access mode if necessary
if(mSettingsFileAccessMode != 0)
{
fchmod(fileno(theFile), mSettingsFileAccessMode);
}
// write the data
fwrite(theNewRawPrefsCFData.GetDataPtr(), theNewRawPrefsCFData.GetSize(), 1, theFile);
// flush the file to be sure it is all on disk
fflush(theFile);
// release the lock
flock(fileno(theFile), LOCK_UN);
// close the file
fclose(theFile);
// stat the file to get the mod date
struct stat theFileInfo;
stat(mSettingsFilePath, &theFileInfo);
// save the mod date
mSettingsCacheTime = theFileInfo.st_mtimespec;
}
else
{
// close the file
fclose(theFile);
}
}
}
}
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