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LSFileWrapper.m
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LSFileWrapper.m
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//
// Copyright (c) 2013 Luke Scott
// https://github.com/lukescott/LSFileWrapper
// Copyright (c) 2020 Adam Kopeć
// https://github.com/admkopec/LSFileWrapper
// Distributed under MIT license
//
#import "LSFileWrapper.h"
@interface LSFileWrapper ()
@property (weak, nonatomic) LSFileWrapper *parent;
@property (strong, nonatomic) NSMutableDictionary<NSString*, LSFileWrapper*> *fileWrappers;
@property (strong, nonatomic) NSString *filename;
@property (strong, nonatomic) NSURL *writtenURL;
@property (strong, nonatomic) id<NSObject> content;
@property (assign, nonatomic) BOOL updated;
@property (assign, nonatomic) BOOL deleted;
@property (assign, nonatomic) BOOL cacheFile;
@end
@interface LSFileWrapper (Internal)
- (LSFileWrapper *)walkDirectoryPath:(NSString *)path create:(BOOL)create;
- (NSString *)setFileWrapper:(LSFileWrapper *)fileWrapper filename:(NSString *)filename_ replace:(BOOL)replace;
- (BOOL)getParentUpdates:(NSMutableArray *)updates withURL:(NSURL *)url;
- (void)getUpdates:(NSMutableArray *)updates withURL:(NSURL *)url;
- (void)getAll:(NSMutableArray *)updates withURL:(NSURL *)url;
- (BOOL)writeUpdates:(NSArray *)updates filemanager:(NSFileManager *)fileManager error:(NSError *__autoreleasing *)outError;
@end
@implementation LSFileWrapper
@synthesize parent;
@synthesize fileWrappers;
@synthesize filename;
@synthesize writtenURL;
@synthesize content;
@synthesize updated;
@synthesize deleted;
@synthesize cacheFile;
@synthesize isDirectory;
- (id)initFile
{
self = [super self];
if (self) {
isDirectory = NO;
_reserve = 0;
}
return self;
}
- (id)initDirectory
{
self = [super init];
if (self) {
isDirectory = YES;
_reserve = 0;
fileWrappers = [[NSMutableDictionary alloc] init];
}
return self;
}
- (id)initWithURL:(NSURL *)url isDirectory:(BOOL)isDir
{
self = [super init];
if (self) {
filename = [url lastPathComponent];
if ([[NSFileManager defaultManager] fileExistsAtPath:[url path] isDirectory:&isDir]) {
writtenURL = url;
}
isDirectory = isDir;
_reserve = 0;
if (isDirectory) {
fileWrappers = [[NSMutableDictionary alloc] init];
for (NSURL *childUrl in [[NSFileManager defaultManager] contentsOfDirectoryAtURL:url
includingPropertiesForKeys:nil
options:0
error:nil]) {
LSFileWrapper *fileWrapper = [[LSFileWrapper alloc] initWithURL:childUrl isDirectory:NO];
[fileWrapper setParent:self];
[fileWrappers setObject:fileWrapper forKey:[childUrl lastPathComponent]];
}
}
}
return self;
}
- (NSData *)data
{
if (content == nil && writtenURL != nil) {
content = [NSData dataWithContentsOfURL:writtenURL];
// cacheFile = YES;
}
if ([content isKindOfClass:[NSData class]]) {
NSData * contentAsData = (NSData *)content;
if (!updated && writtenURL != nil) {
content = nil;
}
return contentAsData;
}
return nil;
}
- (NSString *)string
{
if (content == nil && writtenURL != nil) {
content = [NSData dataWithContentsOfURL:writtenURL];
cacheFile = YES;
}
if ([content isKindOfClass:[NSData class]]) {
content = [[NSString alloc] initWithData:(NSData*)content encoding:NSUTF8StringEncoding];
}
if ([content isKindOfClass:[NSString class]]) {
return (NSString *)content;
}
return nil;
}
- (NSDictionary *)dictionary
{
if (content == nil && writtenURL != nil) {
content = [NSData dataWithContentsOfURL:writtenURL];
cacheFile = YES;
}
if ([content isKindOfClass:[NSData class]]) {
id propList = [NSPropertyListSerialization propertyListWithData:(NSData*)content
options:NSPropertyListImmutable
format:NULL
error:NULL];
if ([propList isKindOfClass:[NSDictionary class]])
{
content = (NSDictionary*)propList;
}
}
if ([content isKindOfClass:[NSDictionary class]]) {
return (NSDictionary *)content;
}
return nil;
}
#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
- (UIImage *)image
{
if (content == nil && writtenURL != nil) {
content = [UIImage imageWithContentsOfFile:writtenURL.path];
cacheFile = YES;
return (UIImage *)content;
}
if ([content isKindOfClass:[NSData class]]) {
content = [UIImage imageWithData:(NSData *)content];
}
if ([content isKindOfClass:[UIImage class]]) {
return (UIImage *)content;
}
return nil;
}
#elif TARGET_OS_OSX
- (NSImage *)image
{
if (content == nil && writtenURL != nil) {
content = [[NSImage alloc] initWithContentsOfFile:writtenURL.path];
cacheFile = YES;
return (NSImage *)content;
}
if ([content isKindOfClass:[NSData class]]) {
content = [[NSImage alloc] initWithData:(NSData *)content];
}
if ([content isKindOfClass:[NSImage class]]) {
return (NSImage *)content;
}
return nil;
}
#endif
- (void)updateContent:(id<NSObject>)content_
{
if (isDirectory) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper directory is not a file."
userInfo:nil];
return;
}
content = content_;
updated = YES;
deleted = NO;
}
- (void)deleteContent
{
content = nil;
updated = NO;
deleted = YES;
}
- (void)incReserve
{
self.reserve++;
}
- (void)decReserve
{
self.reserve--;
}
- (void)deleteUnreserved
{
if (isDirectory && fileWrappers.count > 0) {
for (LSFileWrapper *fileWrapper in [fileWrappers objectEnumerator]) {
[fileWrapper deleteUnreserved];
}
}
else if (self.reserve < 1) {
[self deleteContent];
}
}
- (LSFileWrapper *)fileWrapperWithPath:(NSString *)path
{
return [self fileWrapperWithPath:path create:NO isDirectory:NO];
}
- (NSArray<LSFileWrapper*> *)fileWrappersInPath:(NSString *)path
{
NSMutableArray<LSFileWrapper*> *array = [[NSMutableArray alloc] init];
LSFileWrapper *dirFileWrapper = ([path isEqual: @"/"] || [path isEqual: @""]) ? self : [self fileWrapperWithPath:path];
if (dirFileWrapper) {
[dirFileWrapper.fileWrappers enumerateKeysAndObjectsUsingBlock:^(NSString * _Nonnull key, LSFileWrapper * _Nonnull obj, BOOL * _Nonnull stop) {
[array addObject:obj];
}];
}
return [array copy];
}
- (LSFileWrapper *)fileWrapperWithPath:(NSString *)path create:(BOOL)create isDirectory:(BOOL)isDir
{
NSString *dirpath = [path stringByDeletingLastPathComponent];
NSString *filename_ = [path lastPathComponent];
LSFileWrapper *dirFileWrapper = [self walkDirectoryPath:dirpath create:create];
if (!dirFileWrapper) {
return nil;
}
LSFileWrapper *fileWrapper = [dirFileWrapper.fileWrappers objectForKey:filename_];
if (!fileWrapper) {
if (!create) {
return nil;
}
if (isDir) {
fileWrapper = [[[self class] alloc] initDirectory];
}
else {
fileWrapper = [[[self class] alloc] initFile];
}
[dirFileWrapper setFileWrapper:fileWrapper filename:filename_ replace:YES];
}
return fileWrapper;
}
- (NSString *)addFileWrapper:(LSFileWrapper *)fileWrapper withFilename:(NSString *)filename_;
{
return [self setFileWrapper:fileWrapper filename:filename_ replace:NO];
}
- (void)setFileWrapper:(LSFileWrapper *)fileWrapper withFilename:(NSString *)filename_
{
[self setFileWrapper:fileWrapper filename:filename_ replace:YES];
}
- (void)removeFileWrapper:(LSFileWrapper *)fileWrapper
{
if (!isDirectory) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper file is not a directory."
userInfo:nil];
return;
}
if (fileWrapper == self) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"Cannot remove LSFileWrapper from itself."
userInfo:nil];
return;
}
[self removeFileWrapperWithPath:fileWrapper.filename];
}
- (void)removeFileWrapperWithPath:(NSString *)path
{
NSString *dirpath = [path stringByDeletingLastPathComponent];
NSString *filename_ = [path lastPathComponent];
LSFileWrapper *dirFileWrapper = [self walkDirectoryPath:dirpath create:NO];
if (!dirFileWrapper) {
return;
}
LSFileWrapper *existing = [dirFileWrapper.fileWrappers objectForKey:filename_];
if (existing.writtenURL) {
existing.deleted = YES;
}
else {
[[dirFileWrapper fileWrappers] removeObjectForKey:filename_];
}
dirFileWrapper.updated = YES;
}
- (NSString *)addContent:(id<NSObject>)content_ withFilename:(NSString *)filename_
{
LSFileWrapper *fileWrapper = [[LSFileWrapper alloc] initFile];
[fileWrapper updateContent:content_];
return [self setFileWrapper:fileWrapper filename:filename_ replace:NO];
}
- (void)setContent:(id<NSObject>)content_ withFilename:(NSString *)filename_
{
LSFileWrapper *fileWrapper = [fileWrappers objectForKey:filename_];
if (!fileWrapper) {
fileWrapper = [[LSFileWrapper alloc] initFile];
[self setFileWrapper:fileWrapper filename:filename_ replace:YES];
}
[fileWrapper updateContent:content_];
}
- (BOOL)writeUpdatesToURL:(NSURL *)url error:(NSError *__autoreleasing *)outError
{
NSMutableArray *updates = [[NSMutableArray alloc] init];
if (!updated && !isDirectory) {
return YES;
}
if (parent) {
BOOL parentOK = [self getParentUpdates:updates withURL:url];
if (parentOK == NO) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper child cannot be written to a different directory"
userInfo:nil];
}
}
[self getUpdates:updates withURL:url];
return [self writeUpdates:updates filemanager:[[NSFileManager alloc] init] error:outError];
}
- (BOOL)writeToURL:(NSURL *)url error:(NSError *__autoreleasing *)outError
{
NSMutableArray *updates = [[NSMutableArray alloc] init];
if (parent) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper child cannot be written to new URL"
userInfo:nil];
}
[self getAll:updates withURL:url];
return [self writeUpdates:updates filemanager:[[NSFileManager alloc] init] error:outError];
}
#if TARGET_OS_OSX
- (BOOL)writeToURL:(NSURL *)url forSaveOperation:(NSSaveOperationType)saveOperation originalContentsURL:(nullable NSURL *)absoluteOriginalContentsURL backupDocumentURL:(nullable NSURL *)backupFileURL error:(NSError *__autoreleasing *)outError
{
switch (saveOperation) {
case NSAutosaveInPlaceOperation:
// Auto overwrite
case NSSaveOperation:
// Overwrite
if (backupFileURL) {
// Optional Backup propagation
[[NSFileManager defaultManager] copyItemAtURL:url toURL:backupFileURL error:nil];
[backupFileURL setResourceValues:@{NSURLIsHiddenKey: @YES} error:nil];
}
if (absoluteOriginalContentsURL) {
if (![self writeUpdatesToURL:absoluteOriginalContentsURL error:outError]) {
return NO;
}
if (![url isEqual:absoluteOriginalContentsURL]) {
if(![[NSFileManager defaultManager] copyItemAtURL:absoluteOriginalContentsURL toURL:url error:outError]) {
return NO;
}
}
} else {
if(![self writeToURL:url error:outError]) {
return NO;
}
}
break;
case NSAutosaveAsOperation:
// Auto new with switch
case NSSaveAsOperation:
// New with switch
if(![self writeToURL:url error:outError]) {
return NO;
}
// Switches self to new NSURL
filename = [url lastPathComponent];
writtenURL = url;
isDirectory = YES;
_reserve = 0;
fileWrappers = [[NSMutableDictionary alloc] init];
for (NSURL *childUrl in [[NSFileManager defaultManager] contentsOfDirectoryAtURL:url
includingPropertiesForKeys:nil
options:0
error:nil]) {
LSFileWrapper *fileWrapper = [[LSFileWrapper alloc] initWithURL:childUrl isDirectory:NO];
[fileWrapper setParent:self];
[fileWrappers setObject:fileWrapper forKey:[childUrl lastPathComponent]];
}
[url setResourceValues:@{NSURLHasHiddenExtensionKey: @YES} error:nil];
break;
case NSAutosaveElsewhereOperation:
// Auto totally new
case NSSaveToOperation:
// Totally new
if(![self writeToURL:url error:outError]) {
return NO;
}
[url setResourceValues:@{NSURLHasHiddenExtensionKey: @YES} error:nil];
break;
default:
break;
}
return [url setResourceValues:@{NSURLContentModificationDateKey: [NSDate date]} error:outError];
}
#endif
@end
@implementation LSFileWrapper (Internal)
- (LSFileWrapper *)walkDirectoryPath:(NSString *)path create:(BOOL)create
{
if (!isDirectory) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper file is not a directory."
userInfo:nil];
return nil;
}
if ([path hasPrefix:@"/"]) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"path must be relative"
userInfo:nil];
return nil;
}
NSArray *pathComponents = [path pathComponents];
LSFileWrapper *dirFileWrapper = self;
LSFileWrapper *parentWrapper;
for (NSString *component in pathComponents) {
parentWrapper = dirFileWrapper;
dirFileWrapper = [dirFileWrapper.fileWrappers objectForKey:component];
if (!dirFileWrapper) {
if (!create) {
return nil;
}
dirFileWrapper = [[[self class] alloc] initDirectory];
[parentWrapper setFileWrapper:dirFileWrapper filename:component replace:YES];
}
}
return dirFileWrapper;
}
- (NSString *)setFileWrapper:(LSFileWrapper *)fileWrapper filename:(NSString *)filename_ replace:(BOOL)replace
{
if (!isDirectory) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper file is not a directory."
userInfo:nil];
return nil;
}
if (fileWrapper.parent) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"LSFileWrapper can only have one parent."
userInfo:nil];
return nil;
}
if (fileWrapper == self) {
@throw [NSException exceptionWithName:NSInternalInconsistencyException
reason:@"Cannot add LSFileWrapper to itself."
userInfo:nil];
return nil;
}
if (fileWrapper) {
if (!replace) {
NSString *basename = [filename_ stringByDeletingPathExtension];
NSString *extension = [filename_ pathExtension];
NSString *format;
NSUInteger num = 0;
if (extension.length > 0) {
format = [NSString stringWithFormat:@"%@ %%d.%@", basename, extension];
}
else {
format = [NSString stringWithFormat:@"%@ %%d", basename];
}
while (true) {
// Checking both cases for iOS and macOS interoperability
LSFileWrapper *existing = [fileWrappers objectForKey:filename_];
LSFileWrapper *existingCase = [fileWrappers objectForKey:[filename_ lowercaseString]];
if ((!existing || existing.deleted) && (!existingCase || existingCase.deleted)) {
break;
}
filename_ = [NSString stringWithFormat:format, ++num];
}
}
fileWrapper.parent = self;
fileWrapper.filename = filename_;
fileWrapper.deleted = NO;
[fileWrappers setObject:fileWrapper forKey:filename_];
}
else if (replace) {
LSFileWrapper *existing = [fileWrappers objectForKey:filename_];
if (existing.writtenURL) {
existing.deleted = YES;
}
else {
[fileWrappers removeObjectForKey:filename_];
}
}
updated = YES;
return filename_;
}
#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
- (BOOL)writeAsset:(ALAsset *)asset_ toURL:(NSURL *)url fileManager:(NSFileManager *)fileManager error:(NSError *__autoreleasing *)outError
{
[fileManager createFileAtPath:[url path] contents:nil attributes:nil];
static const NSUInteger BufferSize = 1024*1024;
NSFileHandle *handle = [NSFileHandle fileHandleForWritingToURL:url error:outError];
if (!handle) {
return NO;
}
ALAssetRepresentation *rep = [asset_ defaultRepresentation];
NSUInteger bytesSize = (NSUInteger)[rep size];
NSUInteger bytesRead = 0;
NSUInteger bytesOffset = 0;
uint8_t *buffer = calloc(BufferSize, sizeof(*buffer));
do {
bytesRead = [rep getBytes:buffer fromOffset:bytesOffset length:BufferSize error:outError];
if (!bytesRead) {
break;
}
bytesOffset += bytesRead;
@try {
[handle writeData:[NSData dataWithBytesNoCopy:buffer length:bytesRead freeWhenDone:NO]];
} @catch (NSException *exception) {
//TODO: Should probably convert NSException to NSError
break;
}
} while (bytesOffset < bytesSize);
free(buffer);
return bytesOffset >= bytesSize;
}
- (BOOL)writeImage:(UIImage *)image_ toURL:(NSURL *)url error:(NSError *__autoreleasing *)outError
{
NSData *imageData;
NSString *extension = [url pathExtension];
if ([extension isEqualToString:@"png"]) {
imageData = UIImagePNGRepresentation(image_);
}
else if ([extension isEqualToString:@"jpg"] || [extension isEqualToString:@"jpeg"]) {
imageData = UIImageJPEGRepresentation(image_, 1);
}
return [imageData writeToURL:url options:NSDataWritingAtomic error:outError];
}
#elif TARGET_OS_OSX
- (BOOL)writeImage:(NSImage *)image_ toURL:(NSURL *)url error:(NSError *__autoreleasing *)outError
{
NSData *imageData;
NSString *extension = [url pathExtension];
[image_ lockFocus];
NSBitmapImageRep *bitmapRep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:NSMakeRect(0, 0, image_.size.width, image_.size.height)];
[image_ unlockFocus];
if ([extension isEqualToString:@"png"]) {
imageData = [bitmapRep representationUsingType:NSPNGFileType properties:@{}];
}
else if ([extension isEqualToString:@"jpg"] || [extension isEqualToString:@"jpeg"]) {
imageData = [bitmapRep representationUsingType:NSJPEGFileType properties:@{}];
}
return [imageData writeToURL:url options:NSDataWritingAtomic error:outError];
}
#endif
- (BOOL)getParentUpdates:(NSMutableArray *)updates withURL:(NSURL *)url
{
if (!parent) {
return YES;
}
NSString *parentPath = [url URLByDeletingLastPathComponent].path;
NSString *parentWrittenPath = parent.writtenURL.path;
if (parentWrittenPath) {
return [parentPath isEqual:parentWrittenPath];
}
NSURL *parentURL = [[NSURL alloc] initFileURLWithPath:parentPath];
if ([parent getParentUpdates:updates withURL:parentURL]) {
[updates addObject:@{@"url":parentURL, @"wrapper":parent}];
return YES;
}
return NO;
}
- (void)getUpdates:(NSMutableArray *)updates withURL:(NSURL *)url
{
if (deleted) {
[updates addObject:@{@"url": url, @"wrapper":self, @"shouldPopulateWrittenURL": @YES}];
}
else if (isDirectory) {
if (!writtenURL) {
[updates addObject:@{@"url": url, @"wrapper":self, @"shouldPopulateWrittenURL": @YES}];
}
for (LSFileWrapper *fileWrapper in [fileWrappers objectEnumerator]) {
[fileWrapper getUpdates:updates withURL:[url URLByAppendingPathComponent:fileWrapper.filename]];
}
}
else if (updated && content) {
[updates addObject:@{@"url": url, @"wrapper":self, @"shouldPopulateWrittenURL": @YES}];
}
}
- (void)getAll:(NSMutableArray *)updates withURL:(NSURL *)url {
if (!deleted) {
[updates addObject:@{@"url": url, @"wrapper":self, @"shouldPopulateWrittenURL": @NO}];
if (isDirectory) {
for (LSFileWrapper *fileWrapper in [fileWrappers objectEnumerator]) {
[fileWrapper getAll:updates withURL:[url URLByAppendingPathComponent:fileWrapper.filename]];
}
}
}
}
- (BOOL)writeUpdates:(NSArray *)updates filemanager:(NSFileManager *)fileManager error:(NSError *__autoreleasing *)outError
{
BOOL wroteAll = YES;
for (NSDictionary *updateInfo in updates) {
NSURL *fileURL = [updateInfo objectForKey:@"url"];
LSFileWrapper *fileWrapper = [updateInfo objectForKey:@"wrapper"];
// MARK: Don't change writtenURL for whole file write!
BOOL shouldPopulateWrittenURL = [(NSNumber*)[updateInfo objectForKey:@"shouldPopulateWrittenURL"] boolValue];
if (fileWrapper.content == nil && fileWrapper.writtenURL != nil) {
fileWrapper.content = [NSData dataWithContentsOfURL:fileWrapper.writtenURL];
}
NSObject *fileContent = fileWrapper.content;
BOOL success = YES;
if (fileWrapper.deleted) {
NSLog(@"delete %@", fileURL);
success = [fileManager removeItemAtURL:fileURL error:outError];
}
else if (fileWrapper.isDirectory) {
if (fileWrapper.writtenURL == nil) {
if ([fileManager fileExistsAtPath:[fileURL path]]) {
success = [fileManager removeItemAtURL:fileURL error:outError];
}
success = success && [fileManager createDirectoryAtURL:fileURL withIntermediateDirectories:NO attributes:nil error:outError];
}
}
else {
// Create the directories if they're missing
NSURL* directoryURL = [fileURL URLByDeletingLastPathComponent];
if ([directoryURL checkResourceIsReachableAndReturnError:nil] == NO) {
[[NSFileManager defaultManager] createDirectoryAtURL:directoryURL withIntermediateDirectories:YES attributes:@{NSFileExtensionHidden: @YES} error:outError];
}
if ([fileContent isKindOfClass:[NSData class]]) {
success = [(NSData*)fileContent writeToURL:fileURL options:NSDataWritingAtomic error:outError];
}
else if ([fileContent isKindOfClass:[NSString class]]) {
success = [(NSString*)fileContent writeToURL:fileURL atomically:YES encoding:NSUTF8StringEncoding error:outError];
}
#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
else if ([fileContent isKindOfClass:[UIImage class]]) {
success = [self writeImage:(UIImage *)fileContent toURL:fileURL error:outError];
}
else if ([fileContent isKindOfClass:[ALAsset class]]) {
success = [self writeAsset:(ALAsset *)fileContent toURL:fileURL fileManager:fileManager error:outError];
}
#elif TARGET_OS_OSX
else if ([fileContent isKindOfClass:[NSImage class]]) {
success = [self writeImage:(NSImage *)fileContent toURL:fileURL error:outError];
}
#endif
else {
NSData *data = [NSPropertyListSerialization dataWithPropertyList:fileContent
format:NSPropertyListBinaryFormat_v1_0
options:0
error:NULL];
success = data && [data writeToURL:fileURL atomically:YES];
}
}
if (success == NO) {
wroteAll = NO;
continue;
}
fileWrapper.filename = [fileURL lastPathComponent];
if (shouldPopulateWrittenURL) {
fileWrapper.writtenURL = fileURL;
fileWrapper.updated = NO;
if (!cacheFile) {
fileWrapper.content = nil;
}
} else {
if (!fileWrapper.updated) {
if (!cacheFile) {
fileWrapper.content = nil;
}
}
}
if (fileWrapper.deleted) {
[fileWrapper.parent.fileWrappers removeObjectForKey:fileWrapper.filename];
}
}
return wroteAll;
}
@end