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//
// NSFileManager+NameForTempFile.m
// Filie
//
// Created by Uli Kusterer on 8.2.2004
// Copyright 2004 by Uli Kusterer.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
// -----------------------------------------------------------------------------
// Headers:
// -----------------------------------------------------------------------------
#import "NSFileManager+NameForTempFile.h"
@implementation NSFileManager (UKNameForTempFile)
// -----------------------------------------------------------------------------
// nameForTempFile:
// Quickly generates a (pretty random) unique file name for a file in the
// NSTemporaryDirectory and returns that path. Use this for temporary
// files the user will not see.
//
// REVISIONS:
// 2004-03-21 witness Documented.
// -----------------------------------------------------------------------------
-(NSString*) nameForTempFile
{
NSString* tempDir = NSTemporaryDirectory();
int n = rand();
NSString* fname = nil;
if( !tempDir )
return nil;
while( !fname || [self fileExistsAtPath: fname] )
fname = [tempDir stringByAppendingPathComponent: [NSString stringWithFormat:@"temp_%i", n++]];
return fname;
}
// -----------------------------------------------------------------------------
// uniqueFileName:
// Takes a file path and if an item already exists at that path, generates
// a unique file name by appending a number. Use this to e.g. add files
// to user-owned folders (like the desktop) to ensure you don't overwrite
// any valuable data.
//
// May return NIL if it's searched for a while (after about 2 billion
// attempts).
//
// REVISIONS:
// 2004-03-21 witness Documented.
// -----------------------------------------------------------------------------
-(NSString*) uniqueFileName: (NSString*)oldName
{
NSString* baseName = [oldName stringByDeletingPathExtension];
NSString* suffix = [oldName pathExtension];
NSString* numSuffix = nil;
int n = 1;
NSString* fname = oldName;
BOOL didRemoveTrailingNumber = NO;
while( [self fileExistsAtPath: fname] ) // Keep looping until we have a unique name:
{
if( !didRemoveTrailingNumber )
{
// Remove trailing number or space, but only once we're *sure* the original name already exists:
NSRange nonNumericRange = { 0, 0 };
nonNumericRange.length = [baseName length];
while( nonNumericRange.length > 0 )
{
unichar theCh = [baseName characterAtIndex: nonNumericRange.length -1];
if( theCh == '0' || theCh == '1' || theCh == '2' || theCh == '3' || theCh == '4'
|| theCh == '5' || theCh == '6' || theCh == '7' || theCh == '8' || theCh == '9'
|| theCh == ' ' )
nonNumericRange.length -= 1;
else
break; // Found a non-numeric char.
}
if( nonNumericRange.length != [baseName length] ) // Was a number at the end? Remove it and start counting at that number.
{
numSuffix = [baseName substringFromIndex: nonNumericRange.location +nonNumericRange.length];
baseName = [baseName substringWithRange: nonNumericRange];
n = [numSuffix integerValue];
}
didRemoveTrailingNumber = YES;
}
if( [suffix length] == 0 ) // Build "/folder/file 1"-style path:
fname = [baseName stringByAppendingString: [NSString stringWithFormat:@" %i", n++]];
else // Build "/folder/file 1.suffix"-style path:
fname = [baseName stringByAppendingString: [NSString stringWithFormat:@" %i.%@", n++, suffix]];
if( n <= 0 ) // overflow!
return nil;
}
return fname;
}
@end
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