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//
// ExtendedAttributes.m, based on UKXattrMetadataStore.m
//
// License: MIT <http://opensource.org/licenses/mit-license.php>
//
// Modified by Chris Lee <clee@mg8.org>
// Originally created by Uli Kusterer on 12.03.06.
// Copyright 2006 Uli Kusterer. All rights reserved.
//
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
// -----------------------------------------------------------------------------
// Headers:
// -----------------------------------------------------------------------------
#import "ExtendedAttributes.h"
#import <sys/xattr.h>
@implementation ExtendedAttributes
// -----------------------------------------------------------------------------
// allKeysAtPath:
// Return an NSArray of NSStrings containing all xattr names currently set
// for the file at the specified path.
// -----------------------------------------------------------------------------
+ (NSArray *)allKeysAtPath: (NSString *)path
{
NSMutableArray* allKeys = [NSMutableArray array];
size_t dataSize = listxattr([path fileSystemRepresentation], NULL, ULONG_MAX, 0);
if (dataSize == ULONG_MAX)
return allKeys; // Empty list.
NSMutableData* listBuffer = [NSMutableData dataWithLength: dataSize];
dataSize = listxattr([path fileSystemRepresentation], [listBuffer mutableBytes], [listBuffer length], 0);
char* nameStart = [listBuffer mutableBytes];
int x;
for (x = 0; x < dataSize; x++) {
if (((char*)[listBuffer mutableBytes])[x] == 0) {
NSString* str = [NSString stringWithUTF8String: nameStart];
nameStart = [listBuffer mutableBytes] + x + 1;
[allKeys addObject: str];
}
}
return allKeys;
}
// -----------------------------------------------------------------------------
// setData:forKey:atPath:
// Set the xattr with name key to a block of raw binary data.
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (void)setData: (NSData *)data forKey: (NSString *)key atPath: (NSString *)path
{
setxattr([path fileSystemRepresentation], [key UTF8String], [data bytes], [data length], 0, 0);
}
// -----------------------------------------------------------------------------
// setObject:forKey:atPath:
// Set the xattr with name key to an XML property list representation of
// the specified object (or object graph).
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (void)setObject: (id)obj forKey: (NSString *)key atPath: (NSString *)path
{
// Serialize our objects into a property list XML string:
NSString* errMsg = nil;
NSData* plistData = [NSPropertyListSerialization dataFromPropertyList: obj
format: NSPropertyListXMLFormat_v1_0
errorDescription: &errMsg];
if (errMsg) {
[errMsg autorelease];
[NSException raise: @"UKXattrMetastoreCantSerialize" format: @"%@", errMsg];
}
else
[[self class] setData: plistData forKey: key atPath: path];
}
// -----------------------------------------------------------------------------
// setString:forKey:atPath:
// Set the xattr with name key to an XML property list representation of
// the specified object (or object graph).
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (void)setString: (NSString *)str forKey: (NSString *)key atPath: (NSString *)path
{
NSData *data = [str dataUsingEncoding: NSUTF8StringEncoding];
if (!data)
[NSException raise: NSCharacterConversionException format: @"Couldn't convert string to UTF8 for xattr storage."];
[[self class] setData: data forKey: key atPath: path];
}
// -----------------------------------------------------------------------------
// dataForKey:atPath:
// Retrieve the xattr with name key as a raw block of data.
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (NSMutableData *)dataForKey: (NSString *)key atPath: (NSString *)path
{
size_t dataSize = getxattr([path fileSystemRepresentation], [key UTF8String], NULL, ULONG_MAX, 0, 0);
if (dataSize == ULONG_MAX)
return nil;
NSMutableData *data = [NSMutableData dataWithLength: dataSize];
getxattr([path fileSystemRepresentation], [key UTF8String], [data mutableBytes], [data length], 0, 0);
return data;
}
// -----------------------------------------------------------------------------
// objectForKey:atPath:
// Retrieve the xattr with name key, which is an XML property list
// and unserialize it back into an object or object graph.
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (id)objectForKey: (NSString *)key atPath: (NSString *)path
{
NSString *errMsg = nil;
NSMutableData *data = [[self class] dataForKey: key atPath: path];
NSPropertyListFormat outFormat = NSPropertyListXMLFormat_v1_0;
id obj = [NSPropertyListSerialization propertyListFromData: data mutabilityOption: NSPropertyListImmutable format: &outFormat errorDescription: &errMsg];
if (errMsg) {
[errMsg autorelease];
[NSException raise: @"UKXattrMetastoreCantUnserialize" format: @"%@", errMsg];
}
return obj;
}
// -----------------------------------------------------------------------------
// stringForKey:atPath:
// Retrieve the xattr with name key, which is an XML property list
// and unserialize it back into an object or object graph.
// path is the file whose xattr you want to set.
// -----------------------------------------------------------------------------
+ (id)stringForKey: (NSString *)key atPath: (NSString *)path
{
NSMutableData *data = [[self class] dataForKey: key atPath: path];
return [[[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding] autorelease];
}
@end
#endif /*MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4*/
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