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425
Testing/NSData-test.m
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Testing/NSData-test.m
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/******************************************************************************
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* Module : NSMutableData(NSData) --- Black Box test module for the
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* *Data classes to make sure that methods that raise exceptions
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* do so, and that the exceptions are raised properly.
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*
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* Author : John W. M. Stevens
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Notes : See below by date.
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...............................................................................
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15 April 1997
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NSRange.m
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1) NSMakeRange does an implicit type cast from a float to an
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unsigned long. This is a nasty spot for hard to find errors.
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2) NSMakeRange, in doing the above, automatically converts negative
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numbers to unsigned ints, and (of course) produces some very large
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ints if one of the numbers happens to be a negative number.
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NSData.m
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1) To properly throw an NSRangeException Error in the NSMutableRange
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replaceBytesInRange method, the NSRange location and length values
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must be checked against the NSMutableData size attribute.
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Unfortunately, we once again have a type mismatch (see the notes
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on NSRange.m), as the NSMutableData size attribute is a signed int.
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Is there any reason not to convert the NSMutableData (NSData) size
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attribute to an unsigned int? Should the NSRange values be converted
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to signed ints?
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2) Checking only the summation of location and length (NSMaxRange)
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against the size of the NSData buffer could generate some false
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OK's, as the summation of 2's complement -2.0 and 2.0 converted
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to unsigned ints is of course zero, yet the location value is
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clearly out of range (being less than zero).
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3) Note that with the current implementation of NSData's getBytes
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family of methods, the methods getBytes and getBytes:length could
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throw the NSRangeException. Obviously, it is highly unlikely that
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getBytes would throw this exception, but it is possible that
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getBytes:length could, and the documentation does not specify
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that getBytes:length should return any exceptions. In my opinion,
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this is an acceptable deviation from the standard.
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******************************************************************************/
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#include <stdio.h>
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#include <objc/NSData.h>
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#include <objc/NSException.h>
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#include <objc/NSRange.h>
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#include <objc/NSSerialization.h>
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/* Data for stuffing into *Data objects. I like printable data, as it
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* gives a quick visual check mechanism, but it has the disadvantage
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* of not checking for 8 bit cleanliness.
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*/
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char *testString = "Test string for mutable data and archiver classes.";
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char *subString = "Sub String";
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/*-----------------------------------------------------------------------------
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| Routine : TestNSMutableData() --- Create an instance of an NSMutableData
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| class, initialize it with a C string (to have something
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| printable for tests) and invoke the two methods that
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| should raise NSRangeException exceptions using ranges that
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| cross both edges of the buffer boundary.
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|
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| Notes : Please see work logs for discussion.
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-----------------------------------------------------------------------------*/
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void
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TestNSMutableData(void)
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{
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auto NSMutableData *nsMutData;
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auto char *str;
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auto NSRange range;
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/* Allocate and initialize an instance of an NSMutableData
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* class.
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*/
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nsMutData = [NSMutableData dataWithLength: strlen( testString ) + 1];
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str = (char *) [nsMutData mutableBytes];
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strcpy(str, testString);
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/* Get contents, display. */
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str = NULL;
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str = (char *) [nsMutData mutableBytes];
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printf("NSMutableData Test ---------------------------------------------"
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"---------------\n"
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"1) String: (%s)\n", str);
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/* Attempt to force Range exception by having range start before
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* zero.
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*/
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NS_DURING
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range = NSMakeRange(-2.0, (float) strlen( subString ));
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[nsMutData replaceBytesInRange: range
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withBytes : subString ];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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range = NSMakeRange(41.0, (float) strlen( subString ));
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[nsMutData replaceBytesInRange: range
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withBytes : subString ];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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range = NSMakeRange(42.0, (float) strlen( subString ));
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[nsMutData replaceBytesInRange: range
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withBytes : subString ];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* How about a length that is less than zero? */
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NS_DURING
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range = NSMakeRange(6, -3.0);
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[nsMutData replaceBytesInRange: range
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withBytes : subString ];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force Range exception by having range start before
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* zero.
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*/
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NS_DURING
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range = NSMakeRange(-2.0, (float) strlen( subString ));
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[nsMutData resetBytesInRange: range];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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range = NSMakeRange(41.0, (float) strlen( subString ));
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[nsMutData resetBytesInRange: range];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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range = NSMakeRange(42.0, (float) strlen( subString ));
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[nsMutData resetBytesInRange: range];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* How about a length less than zero? */
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NS_DURING
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range = NSMakeRange(6.0, -3.0);
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[nsMutData resetBytesInRange: range];
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Get contents, display. */
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str = NULL;
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str = (char *) [nsMutData mutableBytes];
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printf("2) String: (%s)\n", str);
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/* Attempt to force an out of memory exception. */
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#if 0
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for ( ; ; )
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{
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/* Append. */
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[nsMutData appendBytes: testString
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length : strlen( testString ) + 1];
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/* Show current value. */
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printf("%9u\r", [nsMutData length]);
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}
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#endif
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}
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/*-----------------------------------------------------------------------------
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| Routine : TestNSData() --- Create an instance of an NSData
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| class, initialize it with a C string (to have something
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| printable for tests) and invoke the two methods that
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| should raise NSRangeException exceptions using ranges that
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| cross both edges of the buffer boundary.
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|
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| Notes : Please see work logs for discussion.
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-----------------------------------------------------------------------------*/
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void
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TestNSData(void)
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{
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auto NSData *nsData;
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auto NSData *newNsData;
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auto char *str;
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auto char bfr[128];
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auto NSRange range;
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/* Allocate and initialize an instance of an NSData
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* class.
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*/
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nsData = [NSData dataWithBytes: testString
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length : (unsigned int) strlen( testString ) + 1];
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/* Get contents, display. */
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str = (char *) [nsData bytes];
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printf("NSData Test ----------------------------------------------------"
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"---------------\n"
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"1) String: (%s)\n", str);
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/* Attempt to force Range exception by having range start before
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* zero.
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*/
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NS_DURING
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/* Get buffer piece. */
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range = NSMakeRange(-2.0, 6.0);
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[nsData getBytes: bfr
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range : range];
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/* Print buffer piece. */
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bfr[6] = '\0';
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printf(" A) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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/* Get piece. */
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range = NSMakeRange(41.0, (float) strlen( subString ));
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[nsData getBytes: bfr
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range : range];
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/* Print buffer piece. */
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bfr[strlen( subString )] = '\0';
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printf(" B) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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range = NSMakeRange(42.0, (float) strlen( subString ));
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[nsData getBytes: bfr
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range : range];
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/* Print buffer piece. */
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bfr[strlen( subString )] = '\0';
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printf(" C) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* How about less than zero length? */
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NS_DURING
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range = NSMakeRange(5.0, -4.0);
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[nsData getBytes: bfr
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range : range];
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/* Print buffer piece. */
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bfr[strlen( subString )] = '\0';
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printf(" C) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/*=================== subDataWithRange ======================================*/
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/* Attempt to force Range exception by having range start before
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* zero.
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*/
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NS_DURING
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/* Get buffer piece. */
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range = NSMakeRange(-2.0, 6.0);
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newNsData = [nsData subdataWithRange: range];
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/* Print buffer piece. */
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[newNsData getBytes: bfr];
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bfr[6] = '\0';
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printf(" D) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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/* Get buffer piece. */
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range = NSMakeRange(41.0, (float) strlen( subString ));
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newNsData = [nsData subdataWithRange: range];
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/* Print buffer piece. */
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[newNsData getBytes: bfr];
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bfr[strlen( subString )] = '\0';
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printf(" E) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Attempt to force another Range exception. */
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NS_DURING
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/* Get buffer piece. */
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range = NSMakeRange(42.0, (float) strlen( subString ));
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newNsData = [nsData subdataWithRange: range];
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/* Print buffer piece. */
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[newNsData getBytes: bfr];
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bfr[strlen( subString )] = '\0';
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printf(" F) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* How about a length less than zero? */
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NS_DURING
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/* Get buffer piece. */
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range = NSMakeRange(9.0, -6.0);
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newNsData = [nsData subdataWithRange: range];
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/* Print buffer piece. */
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[newNsData getBytes: bfr];
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bfr[strlen( subString )] = '\0';
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printf(" F) Buffer: (%s)\n", bfr);
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NS_HANDLER
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fprintf(stderr,
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"%s %d : Exception %s - %s\n",
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__FILE__,
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__LINE__,
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[[localException name] cString],
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[[localException reason] cString]);
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NS_ENDHANDLER
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/* Get contents, display. */
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str = NULL;
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str = (char *) [nsData bytes];
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printf("2) String: (%s)\n", str);
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}
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void
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main(int argc,
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char **argv)
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{
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/* Test NSMutableData. */
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TestNSMutableData();
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/* Test NSData. */
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TestNSData();
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}
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Reference in a new issue