ObjFW  Artifact [015dabf7d7]

Artifact 015dabf7d70dba9ce6aa4c1ec68e11e22c339ebaf571856bceb2a961050da55e:

• File src/OFMessagePackExtension.m — part of check-in [3d16a30f41] at 2013-06-22 12:12:36 on branch trunk — Rework exceptions.

  This mostly removes the argument for the class in which the exception
  occurred. As backtraces were recently added for all platforms, the
  passed class does not give any extra information on where the exception
  occurred anymore.

  This also removes a few other arguments which were not too helpful. In
  the past, the idea was to pass as many arguments as possible so that it
  is easier to find the origin of the exception. However, as backtraces
  are a much better way to find the origin, those are not useful anymore
  and just make the exception more cumbersome to use. The rule is now to
  only pass arguments that might help in recovering from the exception or
  provide information that is otherwise not easily accessible. (user: js, size: 3938) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <stdlib.h>

#import "OFMessagePackExtension.h"
#import "OFDataArray.h"
#import "OFString.h"

#import "OFInvalidArgumentException.h"

#import "macros.h"

@implementation OFMessagePackExtension
+ (instancetype)extensionWithType: (int8_t)type
			     data: (OFDataArray*)data
{
	return [[[self alloc] initWithType: type
				      data: data] autorelease];
}

- init
{
	@try {
		[self doesNotRecognizeSelector: _cmd];
	} @catch (id e) {
		[self release];
		@throw e;
	}

	abort();
}

- initWithType: (int8_t)type
	  data: (OFDataArray*)data
{
	self = [super init];

	@try {
		if (data == nil || [data itemSize] != 1)
			@throw [OFInvalidArgumentException exception];

		_type = type;
		_data = [data retain];
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	[_data release];

	[super dealloc];
}

- (int8_t)type
{
	return _type;
}

- (OFDataArray*)data
{
	OF_GETTER(_data, true)
}

- (OFDataArray*)messagePackRepresentation
{
	OFDataArray *ret;
	int8_t prefix;
	size_t count = [_data count];

	if (count == 1) {
		ret = [OFDataArray dataArrayWithCapacity: 3];

		prefix = 0xD4;
		[ret addItem: &prefix];

		[ret addItem: &_type];
	} else if (count == 2) {
		ret = [OFDataArray dataArrayWithCapacity: 4];

		prefix = 0xD5;
		[ret addItem: &prefix];

		[ret addItem: &_type];
	} else if (count == 4) {
		ret = [OFDataArray dataArrayWithCapacity: 6];

		prefix = 0xD6;
		[ret addItem: &prefix];

		[ret addItem: &_type];
	} else if (count == 8) {
		ret = [OFDataArray dataArrayWithCapacity: 10];

		prefix = 0xD7;
		[ret addItem: &prefix];

		[ret addItem: &_type];
	} else if (count == 16) {
		ret = [OFDataArray dataArrayWithCapacity: 18];

		prefix = 0xD8;
		[ret addItem: &prefix];

		[ret addItem: &_type];
	} else if (count < 0x100) {
		uint8_t length;

		ret = [OFDataArray dataArrayWithCapacity: count + 3];

		prefix = 0xC7;
		[ret addItem: &prefix];

		length = (uint8_t)count;
		[ret addItem: &length];

		[ret addItem: &_type];
	} else if (count < 0x10000) {
		uint16_t length;

		ret = [OFDataArray dataArrayWithCapacity: count + 4];

		prefix = 0xC8;
		[ret addItem: &prefix];

		length = OF_BSWAP16((uint16_t)count);
		[ret addItems: &length
			count: 2];

		[ret addItem: &_type];
	} else {
		uint32_t length;

		ret = [OFDataArray dataArrayWithCapacity: count + 6];

		prefix = 0xC9;
		[ret addItem: &prefix];

		length = OF_BSWAP32((uint32_t)count);
		[ret addItems: &length
			count: 4];

		[ret addItem: &_type];
	}

	[ret addItems: [_data items]
		count: [_data count]];

	return ret;
}

- (OFString*)description
{
	return [OFString stringWithFormat: @"<OFMessagePackExtension: %d, %@>",
					   _type, _data];
}

- (bool)isEqual: (id)object
{
	OFMessagePackExtension *extension;

	if (![object isKindOfClass: [OFMessagePackExtension class]])
		return false;

	extension = object;

	if (extension->_type != _type || ![extension->_data isEqual: _data])
		return false;

	return true;
}

- (uint32_t)hash
{
	uint32_t hash;

	OF_HASH_INIT(hash);

	OF_HASH_ADD(hash, (uint8_t)_type);
	OF_HASH_ADD_HASH(hash, [_data hash]);

	OF_HASH_FINALIZE(hash);

	return hash;
}

- copy
{
	OFMessagePackExtension *ret;
	OFDataArray *data;

	data = [_data copy];
	@try {
		ret = [[OFMessagePackExtension alloc] initWithType: _type
							      data: data];
	} @finally {
		[data release];
	}

	return ret;
}
@end