ObjFW  Diff

#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFOutOfRangeException.h"
#import "OFTruncatedDataException.h"

enum {
	ASN1_TAG_CONSTRUCTED_MASK = 0x20
};

int _OFData_ASN1DERParsing_reference;

static size_t parseObject(OFData *self, id *object, size_t depthLimit);

static OFArray *

		id object;
		size_t objectLength;

		objectLength = parseObject(contents, &object, depthLimit);

		count -= objectLength;
		contents = [contents subdataWithRange:
		    of_range(objectLength, count)];

		[ret addObject: object];
	}

	[ret makeImmutable];

	return ret;

	while (count > 0) {
		id object;
		size_t objectLength;
		OFData *objectData;

		objectLength = parseObject(contents, &object, depthLimit);
		objectData = [contents subdataWithRange:
		    of_range(0, objectLength)];

		if (previousObjectData != nil &&
		    [objectData compare: previousObjectData] !=
		    OF_ORDERED_DESCENDING)
			@throw [OFInvalidFormatException exception];

		count -= objectLength;
		contents = [contents subdataWithRange:
		    of_range(objectLength, count)];

		[ret addObject: object];

		previousObjectData = objectData;
	}

	[ret makeImmutable];

			@throw [OFInvalidFormatException exception];
	}

	if (count - bytesConsumed < contentsLength)
		@throw [OFTruncatedDataException exception];

	contents = [self subdataWithRange:
	    of_range(bytesConsumed, contentsLength)];
	bytesConsumed += contentsLength;

	switch (tag & ~ASN1_TAG_CONSTRUCTED_MASK) {
	case OF_ASN1_TAG_NUMBER_BOOLEAN:
		valueClass = [OFASN1Boolean class];
		break;
	case OF_ASN1_TAG_NUMBER_INTEGER:
		valueClass = [OFASN1Integer class];
		break;
	case OF_ASN1_TAG_NUMBER_BIT_STRING:
		valueClass = [OFASN1BitString class];
		break;
	case OF_ASN1_TAG_NUMBER_OCTET_STRING:
		valueClass = [OFASN1OctetString class];
		break;
	case OF_ASN1_TAG_NUMBER_NULL:
		if (tag & ASN1_TAG_CONSTRUCTED_MASK)
			@throw [OFInvalidFormatException exception];

		if (contents.count != 0)
			@throw [OFInvalidFormatException exception];

		*object = [OFNull null];
		return bytesConsumed;
	case OF_ASN1_TAG_NUMBER_OBJECT_IDENTIFIER:
		valueClass = [OFASN1ObjectIdentifier class];
		break;
	case OF_ASN1_TAG_NUMBER_ENUMERATED:
		valueClass = [OFASN1Enumerated class];
		break;
	case OF_ASN1_TAG_NUMBER_UTF8_STRING:
		valueClass = [OFASN1UTF8String class];
		break;
	case OF_ASN1_TAG_NUMBER_SEQUENCE:
		if (!(tag & ASN1_TAG_CONSTRUCTED_MASK))
			@throw [OFInvalidFormatException exception];

		*object = parseSequence(contents, depthLimit - 1);
		return bytesConsumed;
	case OF_ASN1_TAG_NUMBER_SET:
		if (!(tag & ASN1_TAG_CONSTRUCTED_MASK))
			@throw [OFInvalidFormatException exception];

		*object = parseSet(contents, depthLimit - 1);
		return bytesConsumed;
	case OF_ASN1_TAG_NUMBER_NUMERIC_STRING:
		valueClass = [OFASN1NumericString class];
		break;
	case OF_ASN1_TAG_NUMBER_PRINTABLE_STRING:
		valueClass = [OFASN1PrintableString class];
		break;
	case OF_ASN1_TAG_NUMBER_IA5_STRING:
		valueClass = [OFASN1IA5String class];
		break;
	default:
		valueClass = [OFASN1Value class];
		break;
	}

	*object = [[[valueClass alloc]
	      initWithTagClass: tag >> 6
		     tagNumber: tag & 0x1F
		   constructed: tag & ASN1_TAG_CONSTRUCTED_MASK
	    DEREncodedContents: contents] autorelease];
	return bytesConsumed;
}

@implementation OFData (ASN1DERParsing)
- (id)objectByParsingASN1DER
{