ObjFW  Diff

 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

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

#import "OFInvalidArgumentException.h"

@implementation OFMessagePackExtension
@synthesize type = _type, data = _data;

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

- init
{
	OF_INVALID_INIT_METHOD
}

- 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];
}

- (OFDataArray *)messagePackRepresentation
{
	OFDataArray *ret;
	uint8_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_IF_LE((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_IF_LE((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, %@>",

	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