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#import "OFInvalidFormatException.h"
#import "OFOutOfRangeException.h"
@implementation OFASN1BitString
@synthesize bitStringValue = _bitStringValue;
@synthesize bitStringLength = _bitStringLength;
+ (instancetype)bitStringWithBitStringValue: (OFData *)bitStringValue
bitStringLength: (size_t)bitStringLength
{
return [[[self alloc]
initWithBitStringValue: bitStringValue
bitStringLength: bitStringLength] autorelease];
}
- (instancetype)init
- (instancetype)initWithBitStringValue: (OFData *)bitStringValue
bitStringLength: (size_t)bitStringLength
{
self = [super init];
OF_INVALID_INIT_METHOD
@try {
if ([bitStringValue count] * [bitStringValue itemSize] !=
bitStringLength / 8)
@throw [OFInvalidFormatException exception];
_bitStringValue = [bitStringValue copy];
_bitStringLength = bitStringLength;
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (instancetype)initWithTagClass: (of_asn1_tag_class_t)tagClass
tagNumber: (of_asn1_tag_number_t)tagNumber
constructed: (bool)constructed
DEREncodedContents: (OFData *)DEREncodedContents
{
void *pool = objc_autoreleasePoolPush();
self = [super init];
OFData *bitStringValue;
size_t bitStringLength;
@try {
void *pool = objc_autoreleasePoolPush();
unsigned char lastByteBits;
size_t count = [DEREncodedContents count];
if (tagClass != OF_ASN1_TAG_CLASS_UNIVERSAL ||
tagNumber != OF_ASN1_TAG_NUMBER_BIT_STRING || constructed)
@throw [OFInvalidArgumentException exception];
if ([DEREncodedContents itemSize] != 1 || count == 0)
@throw [OFInvalidFormatException exception];
lastByteBits =
*(unsigned char *)[DEREncodedContents itemAtIndex: 0];
if (count == 1 && lastByteBits != 0)
@throw [OFInvalidFormatException exception];
if (SIZE_MAX / 8 < count - 1 ||
SIZE_MAX - (count - 1) * 8 < lastByteBits)
@throw [OFOutOfRangeException exception];
_bitStringLength = (count - 1) * 8 + lastByteBits;
_bitStringValue = [[DEREncodedContents
bitStringLength = (count - 1) * 8 + lastByteBits;
bitStringValue = [[DEREncodedContents
subdataWithRange: of_range(1, count - 1)] copy];
objc_autoreleasePoolPop(pool);
} @catch (id e) {
[self release];
@throw e;
}
self = [self initWithBitStringValue: bitStringValue
bitStringLength: bitStringLength];
objc_autoreleasePoolPop(pool);
return self;
}
- (instancetype)init
{
OF_INVALID_INIT_METHOD
}
- (void)dealloc
{
[_bitStringValue release];
[super dealloc];
}
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