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MYErrorUtils.m
author Olivier Scherler <oscherler@femto-byte.com>
Tue May 12 14:38:30 2009 +0200 (2009-05-12)
changeset 30 2befbe36c746
parent 27 256370e8935a
permissions -rw-r--r--
Changed -[MYDirectoryEvent relativePath] to work on standardised paths, in case symlinks are used. Fixes issue #28 in Murky. 
     1 //

     2 //  MYErrorUtils.m

     3 //  MYCrypto

     4 //

     5 //  Created by Jens Alfke on 2/25/09.

     6 //  Copyright 2009 Jens Alfke. All rights reserved.

     7 //

     8 

     9 #import "MYErrorUtils.h"

    10 #import "Test.h"

    11 #import "CollectionUtils.h"

    12 #import <Foundation/Foundation.h>

    13 

    14 #if USE_SECURITY_API

    15 #import <Security/SecBase.h>

    16 #endif

    17 

    18 

    19 NSString* const MYErrorDomain = @"MYErrorDomain";

    20 

    21 

    22 static NSError *MYMakeErrorV( int errorCode, NSString *domain, NSString *message, va_list args )

    23 {

    24     message = [[NSString alloc] initWithFormat: message arguments: args];

    25     NSDictionary *userInfo = [NSDictionary dictionaryWithObjectsAndKeys:

    26                                                       message, NSLocalizedDescriptionKey,

    27                                                       nil];

    28     [message release];

    29     return [NSError errorWithDomain: domain

    30                                code: errorCode

    31                            userInfo: userInfo];

    32 }

    33 

    34 

    35 NSError *MYError( int errorCode, NSString *domain, NSString *message, ... )

    36 {

    37     va_list args;

    38     va_start(args,message);

    39     NSError *error = MYMakeErrorV(errorCode,domain,message,args);

    40     va_end(args);

    41     return error;

    42 }

    43 

    44 

    45 BOOL MYReturnError( NSError **outError,

    46                     int errorCode, NSString *domain, NSString *messageFormat, ... ) 

    47 {

    48     if (errorCode) {

    49         if (outError) {

    50             va_list args;

    51             va_start(args,messageFormat);

    52             *outError = MYMakeErrorV(errorCode, domain, messageFormat, args);

    53             va_end(args);

    54             Log(@"MYReturnError: %@",*outError);

    55         } else

    56             Log(@"MYReturnError: %@/%i",domain,errorCode);

    57         return NO;

    58     } else

    59         return YES;

    60 }

    61 

    62 

    63 BOOL MYMiscError( NSError **error, NSString *message, ... )

    64 {

    65     if (error) {

    66         va_list args;

    67         va_start(args,message);

    68         *error = MYMakeErrorV(kMYErrorMisc,MYErrorDomain, message,args);

    69         va_end(args);

    70     }

    71     return NO;

    72 }

    73 

    74 

    75 static NSString* printableOSType( OSType t ) {

    76     if (t < 0x20202020 || t > 0x7e7e7e7e)

    77         return nil;

    78     union {

    79         OSType ostype;

    80         unsigned char ch[4];

    81     } buf;

    82     buf.ostype = CFSwapInt32HostToBig(t);

    83     for (int i=0; i<4; i++)

    84         if (buf.ch[i] < 0x20 || buf.ch[i] > 0x7E)

    85             return nil;

    86     return [[[NSString alloc] initWithBytes: &buf.ch length: 4 encoding: NSMacOSRomanStringEncoding]

    87             autorelease];

    88 }

    89 

    90 

    91 static NSString* printableErrorCode( NSInteger code ) {

    92     if (code < -99999)

    93         return $sprintf(@"%u", code);       // CSSM errors are huge unsigned values > 0x80000000

    94     NSString *result = printableOSType((OSType)code);

    95     if (result)

    96         return result;                      // CoreAudio errors are OSTypes (4-char strings)

    97     return $sprintf(@"%i", code);           // Default: OSStatus and errno values are signed

    98 }

    99 

   100 static NSString* MYShortErrorDomainName( NSString *domain ) {

   101     if ([domain hasPrefix: @"kCFErrorDomain"])

   102         domain = [domain substringFromIndex: 14];

   103     else {

   104         if ([domain hasSuffix: @"ErrorDomain"])

   105             domain = [domain substringToIndex: domain.length - 11];

   106         if ([domain hasPrefix: @"NS"])

   107             domain = [domain substringFromIndex: 2];

   108     }

   109     return domain;

   110 }

   111 

   112 NSString* MYErrorName( NSString *domain, NSInteger code ) {

   113     if (code == 0)

   114         return nil;

   115     NSString *codeStr = printableErrorCode(code);

   116     if (!domain)

   117         return codeStr;

   118     NSString *result = nil;

   119     

   120     if ($equal(domain,NSPOSIXErrorDomain)) {

   121         // Interpret POSIX errors via strerror

   122         // (which unfortunately returns a description, not the name of the constant)

   123         const char *name = strerror(code);

   124         if (name) {

   125             result = [NSString stringWithCString: name encoding: NSASCIIStringEncoding];

   126             if ([result hasPrefix: @"Unknown error"])

   127                 result = nil;

   128         }

   129     } 

   130 #if !TARGET_OS_IPHONE || defined(__SEC_TYPES__)

   131     else if ($equal(domain,NSOSStatusErrorDomain)) {

   132         // If it's an OSStatus, check whether CarbonCore knows its name:

   133         const char *name = NULL;

   134 #if !TARGET_OS_IPHONE

   135         name = GetMacOSStatusErrorString(code);

   136 #endif

   137         if (name && *name)

   138             result = [NSString stringWithCString: name encoding: NSMacOSRomanStringEncoding];

   139         else {

   140 #if USE_SECURITY_API

   141             result = (id) SecCopyErrorMessageString(code,NULL);

   142             if (result) {

   143                 [NSMakeCollectable(result) autorelease];

   144                 if ([result hasPrefix: @"OSStatus "])

   145                     result = nil; // just a generic message

   146             }

   147 #endif

   148         }

   149     }

   150 #endif

   151     

   152     if (!result) {

   153         // Look up errors in string files keyed by the domain name:

   154         NSString *table = [@"MYError_" stringByAppendingString: domain];

   155         result = [[NSBundle mainBundle] localizedStringForKey: codeStr value: @"?" table: table];

   156         if ([result isEqualToString: @"?"])

   157             result = nil;

   158     }

   159     

   160     codeStr = $sprintf(@"%@ %@", MYShortErrorDomainName(domain), codeStr);;

   161     return result ? $sprintf(@"%@ (%@)", result, codeStr) : codeStr;

   162 }

   163 

   164 

   165 

   166 

   167 @implementation NSError (MYUtils)

   168 

   169 - (NSError*) my_errorByPrependingMessage: (NSString*)message

   170 {

   171     if( message.length ) {

   172         NSDictionary *oldUserInfo = self.userInfo;

   173         NSMutableDictionary *userInfo = [NSMutableDictionary dictionary];

   174         if( oldUserInfo )

   175             [userInfo addEntriesFromDictionary: oldUserInfo];

   176         NSString *desc = [oldUserInfo objectForKey: NSLocalizedDescriptionKey];

   177         if( desc )

   178             message = $sprintf(@"%@: %@", message, desc);

   179         [userInfo setObject: message forKey: NSLocalizedDescriptionKey];

   180         return [NSError errorWithDomain: self.domain

   181                                    code: self.code

   182                                userInfo: userInfo];

   183     } else

   184         return self;

   185 }

   186 

   187 - (NSString*) my_nameOfCode {

   188     return MYErrorName(self.domain, self.code);

   189 }

   190 

   191 @end

   192 

   193 

   194 TestCase(MYErrorUtils) {

   195     CAssertEqual(printableOSType('abcd'), @"abcd");

   196     CAssertEqual(printableOSType('    '), @"    ");

   197     CAssertEqual(printableOSType(0x7e7e7e7e), @"~~~~");

   198     CAssertEqual(printableOSType(0x7e7F7e7e), nil);

   199     CAssertEqual(printableOSType(0x7e0D7e7e), nil);

   200     CAssertEqual(printableOSType(0), nil);

   201     CAssertEqual(printableOSType((OSType)-123456), nil);

   202 

   203     CAssertEqual(MYErrorName(nil,0),      nil);

   204     CAssertEqual(MYErrorName(nil,12345),  @"12345");

   205     CAssertEqual(MYErrorName(nil,1),      @"1");

   206     CAssertEqual(MYErrorName(nil,-1),     @"-1");

   207     CAssertEqual(MYErrorName(nil,12345),  @"12345");

   208     CAssertEqual(MYErrorName(nil,-12345), @"-12345");

   209     CAssertEqual(MYErrorName(nil,2147549184u), @"2147549184");

   210     

   211     CAssertEqual(MYErrorName(@"foobar",0), nil);

   212     CAssertEqual(MYErrorName(@"foobar",'fmt?'), @"foobar fmt?");

   213     CAssertEqual(MYErrorName(@"foobar",1), @"foobar 1");

   214     CAssertEqual(MYErrorName(@"FoobarErrorDomain",-1), @"Foobar -1");

   215     CAssertEqual(MYErrorName(@"NSFoobarErrorDomain",12345), @"Foobar 12345");

   216 

   217     NSError *err;

   218     err = [NSError errorWithDomain: NSPOSIXErrorDomain code: EPERM userInfo: nil];

   219     CAssertEqual(err.my_nameOfCode, @"Operation not permitted (POSIX 1)");

   220     err = [NSError errorWithDomain: NSPOSIXErrorDomain code: 12345 userInfo: nil];

   221     CAssertEqual(err.my_nameOfCode, @"POSIX 12345");

   222     

   223 #if !TARGET_OS_IPHONE

   224     err = [NSError errorWithDomain: NSOSStatusErrorDomain code: paramErr userInfo: nil];

   225     CAssertEqual(err.my_nameOfCode, @"paramErr (OSStatus -50)");

   226     err = [NSError errorWithDomain: NSOSStatusErrorDomain code: fnfErr userInfo: nil];

   227     CAssertEqual(err.my_nameOfCode, @"fnfErr (OSStatus -43)");

   228     err = [NSError errorWithDomain: NSOSStatusErrorDomain code: -25291 userInfo: nil];

   229     CAssertEqual(err.my_nameOfCode, @"errKCNotAvailable / errSecNotAvailable (OSStatus -25291)");

   230     err = [NSError errorWithDomain: NSOSStatusErrorDomain code: -25260 userInfo: nil];

   231     CAssertEqual(err.my_nameOfCode, @"Passphrase is required for import/export. (OSStatus -25260)");

   232 #endif

   233     err = [NSError errorWithDomain: NSOSStatusErrorDomain code: 12345 userInfo: nil];

   234     CAssertEqual(err.my_nameOfCode, @"OSStatus 12345");

   235 

   236     err = [NSError errorWithDomain: @"CSSMErrorDomain" code: 2147549184u userInfo: nil];

   237     CAssertEqual(err.my_nameOfCode, @"CSSM_CSSM_BASE_ERROR (CSSM 2147549184)");

   238 

   239     err = [NSError errorWithDomain: (id)kCFErrorDomainCocoa code: 100 userInfo: nil];

   240     CAssertEqual(err.my_nameOfCode, @"Cocoa 100");

   241 }
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