jens@0: //
jens@0: //  FileAlias.m
jens@0: //  MYUtilities
jens@0: //
jens@0: //  Copyright 2008 Jens Alfke. All rights reserved.
jens@0: //
jens@0: 
jens@0: #import "FileAlias.h"
jens@0: #import "FileUtils.h"
jens@0: 
jens@0: 
jens@0: @implementation FileAlias
jens@0: 
jens@0: 
jens@0: - (id) initWithFilePath: (NSString*)targetPath 
jens@0:          relativeToPath: (NSString*)fromPath
jens@0:                   error: (NSError**)error
jens@0: {
jens@0:     NSParameterAssert(targetPath);
jens@0:     self = [super init];
jens@0:     if( self ) {
jens@0:         OSStatus err;
jens@0:         FSRef fromRef, targetRef;
jens@0:         err = PathToFSRef(targetPath, &targetRef);
jens@0:         if( ! err ) {
jens@0:             if( fromPath ) {
jens@0:                 err = PathToFSRef(fromPath,&fromRef);
jens@0:                 if( ! err )
jens@0:                     err = FSNewAlias(&fromRef,&targetRef,&_alias);
jens@0:             } else {
jens@0:                 err = FSNewAlias(NULL,&targetRef,&_alias);
jens@0:             }
jens@0:         }
jens@0:         
jens@0:         if( ! CheckOSErr(err,error) ) {
jens@0:             Warn(@"FileAlias init failed with OSStatus %i",err);
jens@0:             [self release];
jens@0:             return nil;
jens@0:         }
jens@0:     }
jens@0:     return self;
jens@0: }
jens@0: 
jens@0: - (id) initWithFilePath: (NSString*)path
jens@0:                   error: (NSError**)error
jens@0: {
jens@0:     return [self initWithFilePath: path relativeToPath: nil error: error];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (void) dealloc
jens@0: {
jens@0:     if( _alias )
jens@0:         DisposeHandle((Handle)_alias);
jens@0:     [super dealloc];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (void)encodeWithCoder:(NSCoder *)coder
jens@0: {
jens@0:     NSParameterAssert([coder allowsKeyedCoding]);
jens@0:     NSKeyedArchiver *arch = (NSKeyedArchiver*)coder;
jens@0: 
jens@0:     [arch encodeBytes: (const uint8_t *) *_alias 
jens@0:                length: GetHandleSize((Handle)_alias)
jens@0:                forKey: @"aliasHandle"];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (id)initWithCoder:(NSCoder *)decoder
jens@0: {
jens@0:     NSParameterAssert([decoder allowsKeyedCoding]);
jens@0:     NSKeyedUnarchiver *arch = (NSKeyedUnarchiver*)decoder;
jens@0: 
jens@0:     self = [super init];
jens@0:     if( self ) {
jens@0:         Handle handle;
jens@0:         unsigned length;
jens@0:         const void *bytes = [arch decodeBytesForKey:@"aliasHandle" returnedLength: &length];
jens@0:         if( bytes )
jens@0:             PtrToHand(bytes,&handle,length);
jens@0:         if( ! handle ) {
jens@0:             [self release];
jens@0:             return nil;
jens@0:         }
jens@0:         _alias = (AliasHandle) handle;
jens@0:     }
jens@0:     return self;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (NSString*) description
jens@0: {
jens@0:     return [NSString stringWithFormat: @"%@['%@']", [self class],[self originalFilename]];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (NSString*) originalPath
jens@0: {
jens@0:     CFStringRef path = NULL;
jens@0:     OSStatus err = FSCopyAliasInfo(_alias,NULL,NULL,&path,NULL,NULL);
jens@0:     if( err )
jens@0:         return nil;
jens@0:     else
jens@0:         return [(id)path autorelease];
jens@0: }
jens@0: 
jens@0: - (NSString*) originalFilename
jens@0: {
jens@0:     HFSUniStr255 targetName;
jens@0:     OSStatus err = FSCopyAliasInfo(_alias,&targetName,NULL,NULL,NULL,NULL);
jens@0:     if( err )
jens@0:         return nil;
jens@0:     else
jens@0:         return [(id)FSCreateStringFromHFSUniStr(NULL,&targetName) autorelease];
jens@0: }
jens@0: 
jens@0: - (NSString*) originalVolumeName
jens@0: {
jens@0:     HFSUniStr255 volName;
jens@0:     OSStatus err = FSCopyAliasInfo(_alias,NULL,&volName,NULL,NULL,NULL);
jens@0:     if( err )
jens@0:         return nil;
jens@0:     else
jens@0:         return [(id)FSCreateStringFromHFSUniStr(NULL,&volName) autorelease];
jens@0: }
jens@0: 
jens@0: - (void) dump
jens@0: {
jens@0:     HFSUniStr255 targetName,volName;
jens@0:     CFStringRef path;
jens@0:     FSAliasInfoBitmap whichInfo = 0;
jens@0:     FSAliasInfo info;
jens@0:     OSStatus err = FSCopyAliasInfo(_alias,&targetName,&volName,&path,&whichInfo,&info);
jens@0:     if( err ) {
jens@0:         NSLog(@"FSCopyAliasInfo returned error %i",err);
jens@0:         return;
jens@0:     }
jens@0:     NSString *str = (id)FSCreateStringFromHFSUniStr(NULL,&targetName);
jens@0:     NSLog(@"Target name = '%@'",str);
jens@0:     [str release];
jens@0:     str = (id)FSCreateStringFromHFSUniStr(NULL,&volName);
jens@0:     NSLog(@"Volume name = '%@'",str);
jens@0:     [str release];
jens@0:     NSLog(@"Path        = %@",path);
jens@0:     if( path ) CFRelease(path);
jens@0:     NSLog(@"Info bitmap = %08X", whichInfo);
jens@0: }    
jens@0: 
jens@0: 
jens@0: #pragma mark -
jens@0: #pragma mark RESOLVING:
jens@0: 
jens@0: 
jens@0: - (NSString*) filePathRelativeToPath: (NSString*)fromPath error: (NSError**)error
jens@0: {
jens@0:     FSRef fromRef, targetRef, *fromRefPtr;
jens@0:     if( fromPath ) {
jens@0:         if( ! CheckOSErr( PathToFSRef(fromPath,&fromRef), error ) )
jens@0:             return NO;
jens@0:         fromRefPtr = &fromRef;
jens@0:     } else {
jens@0:         fromRefPtr = NULL;
jens@0:     }
jens@0:     
jens@0:     Boolean wasChanged;
jens@0:     NSString *targetPath;
jens@0:     if( CheckOSErr( FSResolveAlias(fromRefPtr,_alias,&targetRef,&wasChanged), error)
jens@0:             && CheckOSErr( FSRefToPath(&targetRef,&targetPath), error ) )
jens@0:         return targetPath;
jens@0:     else {
jens@0:         NSLog(@"%@: Couldn't resolve alias!",self);
jens@0:         [self dump];
jens@0:         return nil;
jens@0:     }
jens@0: }
jens@0: 
jens@0: - (NSString*) filePath: (NSError**)error
jens@0: {
jens@0:     return [self filePathRelativeToPath: nil error: error];
jens@0: }
jens@0: 
jens@0: 
jens@0: - (NSArray*) findMatchesRelativeToPath: (NSString*)fromPath 
jens@0:                              withRules: (unsigned)rules
jens@0:                                  error: (NSError**)error
jens@0: {
jens@0:     FSRef fromRef, *fromRefPtr;
jens@0:     if( fromPath ) {
jens@0:         if( ! CheckOSErr( PathToFSRef(fromPath,&fromRef), error ) )
jens@0:             return nil;
jens@0:         fromRefPtr = &fromRef;
jens@0:     } else {
jens@0:         fromRefPtr = NULL;
jens@0:     }
jens@0:     
jens@0:     Boolean wasChanged;
jens@0:     short count = 10;
jens@0:     FSRef matches[count];
jens@0:     
jens@0: #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
jens@0:     if( ! FSMatchAliasBulk(fromRefPtr, rules, _alias, &count, matches, &wasChanged, NULL, NULL), error ) {
jens@0:         NSLog(@"%@: FSMatchAliasBulk failed!",self);
jens@0:         return nil;
jens@0:     }
jens@0: #else
jens@0:     if( ! CheckOSErr( FSMatchAlias(fromRefPtr,rules,_alias,&count,matches,&wasChanged,NULL,NULL), error) ) {
jens@0:         NSLog(@"%@: FSMatchAlias failed!",self);
jens@0:         return nil;
jens@0:     }
jens@0: #endif
jens@0:     
jens@0:     NSMutableArray *paths = [NSMutableArray arrayWithCapacity: count];
jens@0:     for( short i=0; i<count; i++ ) {
jens@0:         NSString *path;
jens@0:         if( FSRefToPath(&matches[i],&path) == noErr )
jens@0:             [paths addObject: path];
jens@0:     }
jens@0:     return paths;
jens@0: }
jens@0: 
jens@0: 
jens@0: - (NSArray*) findMatches: (NSError**)error
jens@0: {
jens@0:     return [self findMatchesRelativeToPath: nil
jens@0:                                  withRules: kARMMultVols | kARMSearch | kARMSearchMore | kARMTryFileIDFirst
jens@0:                                      error: error];
jens@0: }
jens@0: 
jens@0: 
jens@0: @end