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| // | ||
| // DTExtendedFileAttributes.h | ||
| // DTFoundation | ||
| // | ||
| // Created by Oliver Drobnik on 3/6/12. | ||
| // Copyright (c) 2012 Cocoanetics. All rights reserved. | ||
| // | ||
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| /** | ||
| This class providse read/write access to extended file attributes of a file or folder. It wraps the standard xattr Posix functions to do that. | ||
| Because the file system does not keep track of the data types saved in extended attributes this API so far reads and writes strings. | ||
| */ | ||
| @interface DTExtendedFileAttributes : NSObject | ||
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| /** | ||
| @name Creating an Extended File Attribute Manager | ||
| */ | ||
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| /** | ||
| Creates an Extended File Attribute Manager. | ||
| @param path The file path | ||
| */ | ||
| - (id)initWithPath:(NSString *)path; | ||
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| /** | ||
| @name: Reading/Writing extended attributes | ||
| */ | ||
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| /** | ||
| Removes an extended file attribute from the receiver. | ||
| @returns `YES` if successful. | ||
| */ | ||
| - (BOOL)removeAttribute:(NSString *)attribute; | ||
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| /** | ||
| Sets the value of an extended file attribute for the receiver. | ||
| If the value is `nil` then this is the same as calling <removeAttribute:>. | ||
| @param attribute The name of the attribute. | ||
| @returns `YES` if successful. | ||
| */ | ||
| - (BOOL)setValue:(NSString *)value forAttribute:(NSString *)attribute; | ||
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| /** | ||
| Gets the value of an extended file attribute from the receiver. | ||
| @param attribute The name of the attribute. | ||
| @returns The string for the value or `nil` if the value is not set. | ||
| */ | ||
| - (NSString *)valueForAttribute:(NSString *)attribute; | ||
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| @end |
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| // | ||
| // DTExtendedFileAttributes.m | ||
| // DTFoundation | ||
| // | ||
| // Created by Oliver Drobnik on 3/6/12. | ||
| // Copyright (c) 2012 Cocoanetics. All rights reserved. | ||
| // | ||
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| #import "DTExtendedFileAttributes.h" | ||
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| #import <sys/xattr.h> | ||
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| @implementation DTExtendedFileAttributes | ||
| { | ||
| NSString *_path; | ||
| } | ||
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| - (id)initWithPath:(NSString *)path | ||
| { | ||
| self = [super init]; | ||
| if (self) | ||
| { | ||
| if (![path length]) | ||
| { | ||
| return nil; | ||
| } | ||
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| _path = path; | ||
| } | ||
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| return self; | ||
| } | ||
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| - (BOOL)removeAttribute:(NSString *)attribute | ||
| { | ||
| const char *attrName = [attribute UTF8String]; | ||
| const char *filePath = [_path fileSystemRepresentation]; | ||
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| int result = removexattr(filePath, attrName, 0); | ||
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| return (result==0); | ||
| } | ||
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| - (BOOL)setValue:(NSString *)value forAttribute:(NSString *)attribute | ||
| { | ||
| if (![attribute length]) | ||
| { | ||
| return NO; | ||
| } | ||
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| if (!value) | ||
| { | ||
| // remove it instead | ||
| return [self removeAttribute:attribute]; | ||
| } | ||
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| const char *attrName = [attribute UTF8String]; | ||
| const char *filePath = [_path fileSystemRepresentation]; | ||
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| const char *val = [value UTF8String]; | ||
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| int result = setxattr(filePath, attrName, val, strlen(val), 0, 0); | ||
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| return (result==0); | ||
| } | ||
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| - (NSString *)valueForAttribute:(NSString *)attribute | ||
| { | ||
| if (![attribute length]) | ||
| { | ||
| return nil; | ||
| } | ||
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| const char *attrName = [attribute UTF8String]; | ||
| const char *filePath = [_path fileSystemRepresentation]; | ||
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| // get size of needed buffer | ||
| int bufferLength = getxattr(filePath, attrName, NULL, 0, 0, 0); | ||
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| if (bufferLength<=0) | ||
| { | ||
| return nil; | ||
| } | ||
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| // make a buffer of sufficient length | ||
| char *buffer = malloc(bufferLength); | ||
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| // now actually get the attribute string | ||
| getxattr(filePath, attrName, buffer, 255, 0, 0); | ||
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| // convert to NSString | ||
| NSString *retString = [[NSString alloc] initWithBytes:buffer length:bufferLength encoding:NSUTF8StringEncoding]; | ||
|
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| // release buffer | ||
| free(buffer); | ||
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| return retString; | ||
| } | ||
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| @end |
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