SameBoy/HexFiend/HFPasteboardOwner.m

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//
// HFPasteboardOwner.m
// HexFiend_2
//
// Copyright 2008 ridiculous_fish. All rights reserved.
//
#import <HexFiend/HFPasteboardOwner.h>
#import <HexFiend/HFController.h>
#import <HexFiend/HFByteArray.h>
#import <objc/message.h>
NSString *const HFPrivateByteArrayPboardType = @"HFPrivateByteArrayPboardType";
@implementation HFPasteboardOwner
+ (void)initialize {
if (self == [HFPasteboardOwner class]) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(prepareCommonPasteboardsForChangeInFileNotification:) name:HFPrepareForChangeInFileNotification object:nil];
}
}
- (instancetype)initWithPasteboard:(NSPasteboard *)pboard forByteArray:(HFByteArray *)array withTypes:(NSArray *)types {
REQUIRE_NOT_NULL(pboard);
REQUIRE_NOT_NULL(array);
REQUIRE_NOT_NULL(types);
self = [super init];
byteArray = [array retain];
pasteboard = pboard;
[pasteboard declareTypes:types owner:self];
// get notified when we're about to write a file, so that if they're overwriting a file backing part of our byte array, we can properly clear or preserve our pasteboard
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeInFileNotification:) name:HFPrepareForChangeInFileNotification object:nil];
return self;
}
+ (id)ownPasteboard:(NSPasteboard *)pboard forByteArray:(HFByteArray *)array withTypes:(NSArray *)types {
return [[[self alloc] initWithPasteboard:pboard forByteArray:array withTypes:types] autorelease];
}
- (void)tearDownPasteboardReferenceIfExists {
if (pasteboard) {
pasteboard = nil;
[[NSNotificationCenter defaultCenter] removeObserver:self name:HFPrepareForChangeInFileNotification object:nil];
}
if (retainedSelfOnBehalfOfPboard) {
CFRelease(self);
retainedSelfOnBehalfOfPboard = NO;
}
}
+ (HFByteArray *)_unpackByteArrayFromDictionary:(NSDictionary *)byteArrayDictionary {
HFByteArray *result = nil;
if (byteArrayDictionary) {
NSString *uuid = byteArrayDictionary[@"HFUUID"];
if ([uuid isEqual:[self uuid]]) {
result = (HFByteArray *)[byteArrayDictionary[@"HFByteArray"] unsignedLongValue];
}
}
return result;
}
+ (HFByteArray *)unpackByteArrayFromPasteboard:(NSPasteboard *)pasteboard {
REQUIRE_NOT_NULL(pasteboard);
HFByteArray *result = [self _unpackByteArrayFromDictionary:[pasteboard propertyListForType:HFPrivateByteArrayPboardType]];
return result;
}
/* Try to fix up commonly named pasteboards when a file is about to be saved */
+ (void)prepareCommonPasteboardsForChangeInFileNotification:(NSNotification *)notification {
const BOOL *cancellationPointer = [[notification userInfo][HFChangeInFileShouldCancelKey] pointerValue];
if (*cancellationPointer) return; //don't do anything if someone requested cancellation
NSDictionary *userInfo = [notification userInfo];
NSArray *changedRanges = userInfo[HFChangeInFileModifiedRangesKey];
HFFileReference *fileReference = [notification object];
NSMutableDictionary *hint = userInfo[HFChangeInFileHintKey];
NSString * const names[] = {NSGeneralPboard, NSFindPboard, NSDragPboard};
NSUInteger i;
for (i=0; i < sizeof names / sizeof *names; i++) {
NSPasteboard *pboard = [NSPasteboard pasteboardWithName:names[i]];
HFByteArray *byteArray = [self unpackByteArrayFromPasteboard:pboard];
if (byteArray && ! [byteArray clearDependenciesOnRanges:changedRanges inFile:fileReference hint:hint]) {
/* This pasteboard no longer works */
[pboard declareTypes:@[] owner:nil];
}
}
}
- (void)changeInFileNotification:(NSNotification *)notification {
HFASSERT(pasteboard != nil);
HFASSERT(byteArray != nil);
NSDictionary *userInfo = [notification userInfo];
const BOOL *cancellationPointer = [userInfo[HFChangeInFileShouldCancelKey] pointerValue];
if (*cancellationPointer) return; //don't do anything if someone requested cancellation
NSMutableDictionary *hint = userInfo[HFChangeInFileHintKey];
NSArray *changedRanges = [notification userInfo][HFChangeInFileModifiedRangesKey];
HFFileReference *fileReference = [notification object];
if (! [byteArray clearDependenciesOnRanges:changedRanges inFile:fileReference hint:hint]) {
/* We can't do it */
[self tearDownPasteboardReferenceIfExists];
}
}
- (void)dealloc {
[self tearDownPasteboardReferenceIfExists];
[byteArray release];
[super dealloc];
}
- (void)writeDataInBackgroundToPasteboard:(NSPasteboard *)pboard ofLength:(unsigned long long)length forType:(NSString *)type trackingProgress:(id)tracker {
USE(length);
USE(pboard);
USE(type);
USE(tracker);
UNIMPLEMENTED_VOID();
}
- (void)backgroundMoveDataToPasteboard:(NSString *)type {
@autoreleasepool {
[self writeDataInBackgroundToPasteboard:pasteboard ofLength:dataAmountToCopy forType:type trackingProgress:nil];
[self performSelectorOnMainThread:@selector(backgroundMoveDataFinished:) withObject:nil waitUntilDone:NO];
}
}
- (void)backgroundMoveDataFinished:unused {
USE(unused);
HFASSERT(backgroundCopyOperationFinished == NO);
backgroundCopyOperationFinished = YES;
if (! didStartModalSessionForBackgroundCopyOperation) {
/* We haven't started the modal session, so make sure it never happens */
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(beginModalSessionForBackgroundCopyOperation:) object:nil];
CFRunLoopWakeUp(CFRunLoopGetCurrent());
}
else {
/* We have started the modal session, so end it. */
[NSApp stopModalWithCode:0];
//stopModal: won't trigger unless we post a do-nothing event
NSEvent *event = [NSEvent otherEventWithType:NSApplicationDefined location:NSZeroPoint modifierFlags:0 timestamp:0 windowNumber:0 context:NULL subtype:0 data1:0 data2:0];
[NSApp postEvent:event atStart:NO];
}
}
- (void)beginModalSessionForBackgroundCopyOperation:(id)unused {
USE(unused);
HFASSERT(backgroundCopyOperationFinished == NO);
HFASSERT(didStartModalSessionForBackgroundCopyOperation == NO);
didStartModalSessionForBackgroundCopyOperation = YES;
}
- (BOOL)moveDataWithProgressReportingToPasteboard:(NSPasteboard *)pboard forType:(NSString *)type {
// The -[NSRunLoop runMode:beforeDate:] call in the middle of this function can cause it to be
// called reentrantly, which was previously causing leaks and use-after-free crashes. For
// some reason this happens basically always when copying lots of data into VMware Fusion.
// I'm not even sure what the ideal behavior would be here, but am fairly certain that this
// is the best that can be done without rewriting a portion of the background copying code.
// TODO: Figure out what the ideal behavior should be here.
HFASSERT(pboard == pasteboard);
[self retain]; //resolving the pasteboard may release us, which deallocates us, which deallocates our tracker...make sure we survive through this function
/* Give the user a chance to request a smaller amount if it's really big */
unsigned long long availableAmount = [byteArray length];
unsigned long long amountToCopy = [self amountToCopyForDataLength:availableAmount stringLength:[self stringLengthForDataLength:availableAmount]];
if (amountToCopy > 0) {
backgroundCopyOperationFinished = NO;
didStartModalSessionForBackgroundCopyOperation = NO;
dataAmountToCopy = amountToCopy;
[NSThread detachNewThreadSelector:@selector(backgroundMoveDataToPasteboard:) toTarget:self withObject:type];
[self performSelector:@selector(beginModalSessionForBackgroundCopyOperation:) withObject:nil afterDelay:1.0 inModes:@[NSModalPanelRunLoopMode]];
while (! backgroundCopyOperationFinished) {
[[NSRunLoop currentRunLoop] runMode:NSModalPanelRunLoopMode beforeDate:[NSDate distantFuture]];
}
}
[self release];
return YES;
}
- (void)pasteboardChangedOwner:(NSPasteboard *)pboard {
HFASSERT(pasteboard == pboard);
[self tearDownPasteboardReferenceIfExists];
}
- (HFByteArray *)byteArray {
return byteArray;
}
- (void)pasteboard:(NSPasteboard *)pboard provideDataForType:(NSString *)type {
if (! pasteboard) {
/* Don't do anything, because we've torn down our pasteboard */
return;
}
if ([type isEqualToString:HFPrivateByteArrayPboardType]) {
if (! retainedSelfOnBehalfOfPboard) {
retainedSelfOnBehalfOfPboard = YES;
CFRetain(self);
}
NSDictionary *dict = @{@"HFByteArray": @((unsigned long)byteArray),
@"HFUUID": [[self class] uuid]};
[pboard setPropertyList:dict forType:type];
}
else {
if (! [self moveDataWithProgressReportingToPasteboard:pboard forType:type]) {
[pboard setData:[NSData data] forType:type];
}
}
}
- (void)setBytesPerLine:(NSUInteger)val { bytesPerLine = val; }
- (NSUInteger)bytesPerLine { return bytesPerLine; }
+ (NSString *)uuid {
static NSString *uuid;
if (! uuid) {
CFUUIDRef uuidRef = CFUUIDCreate(NULL);
uuid = (NSString *)CFUUIDCreateString(NULL, uuidRef);
CFRelease(uuidRef);
}
return uuid;
}
- (unsigned long long)stringLengthForDataLength:(unsigned long long)dataLength { USE(dataLength); UNIMPLEMENTED(); }
- (unsigned long long)amountToCopyForDataLength:(unsigned long long)numBytes stringLength:(unsigned long long)stringLength {
unsigned long long dataLengthResult, stringLengthResult;
NSInteger alertReturn = NSIntegerMax;
const unsigned long long copyOption1 = MAXIMUM_PASTEBOARD_SIZE_TO_EXPORT;
const unsigned long long copyOption2 = MINIMUM_PASTEBOARD_SIZE_TO_WARN_ABOUT;
NSString *option1String = HFDescribeByteCount(copyOption1);
NSString *option2String = HFDescribeByteCount(copyOption2);
NSString* dataSizeDescription = HFDescribeByteCount(stringLength);
if (stringLength >= MAXIMUM_PASTEBOARD_SIZE_TO_EXPORT) {
NSString *option1 = [@"Copy " stringByAppendingString:option1String];
NSString *option2 = [@"Copy " stringByAppendingString:option2String];
alertReturn = NSRunAlertPanel(@"Large Clipboard", @"The copied data would occupy %@ if written to the clipboard. This is larger than the system clipboard supports. Do you want to copy only part of the data?", @"Cancel", option1, option2, dataSizeDescription);
switch (alertReturn) {
case NSAlertDefaultReturn:
default:
stringLengthResult = 0;
break;
case NSAlertAlternateReturn:
stringLengthResult = copyOption1;
break;
case NSAlertOtherReturn:
stringLengthResult = copyOption2;
break;
}
}
else if (stringLength >= MINIMUM_PASTEBOARD_SIZE_TO_WARN_ABOUT) {
NSString *option1 = [@"Copy " stringByAppendingString:HFDescribeByteCount(stringLength)];
NSString *option2 = [@"Copy " stringByAppendingString:HFDescribeByteCount(copyOption2)];
alertReturn = NSRunAlertPanel(@"Large Clipboard", @"The copied data would occupy %@ if written to the clipboard. Performing this copy may take a long time. Do you want to copy only part of the data?", @"Cancel", option1, option2, dataSizeDescription);
switch (alertReturn) {
case NSAlertDefaultReturn:
default:
stringLengthResult = 0;
break;
case NSAlertAlternateReturn:
stringLengthResult = stringLength;
break;
case NSAlertOtherReturn:
stringLengthResult = copyOption2;
break;
}
}
else {
/* Small enough to copy it all */
stringLengthResult = stringLength;
}
/* Convert from string length to data length */
if (stringLengthResult == stringLength) {
dataLengthResult = numBytes;
}
else {
unsigned long long divisor = stringLength / numBytes;
dataLengthResult = stringLengthResult / divisor;
}
return dataLengthResult;
}
@end