NULevelDB/Classes/NULDBUtilities.mm at master · pressly/NULevelDB · GitHub

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//
//  NULDBUtilities.m
//  NULevelDB
//
//  Created by Brent Gulanowski on 11-08-10.
//  Copyright 2011 Nulayer Inc. All rights reserved.
//

#import "NULDBUtilities.h"


Class stringClass;
Class dataClass;
Class dictClass;
Class arrayClass;


NSData *NULDBEncodedObject(id<NSCoding>object) {

    char type = 'o';

    if([(id)object isKindOfClass:stringClass])    type = 's';
    else if([(id)object isKindOfClass:dataClass]) type = 'd';
    else if([(id)object isKindOfClass:dictClass] || [(id)object isKindOfClass:arrayClass]) type = 'h';

    NSMutableData *d = [NSMutableData dataWithBytes:&type length:1];

    switch (type) {
        case 's':
            [d appendData:[(NSString *)object dataUsingEncoding:NSUTF8StringEncoding]];
            break;

        case 'd':
            [d appendData:(NSData *)object];
            break;

        case 'h':
            [d appendData:[NSPropertyListSerialization dataWithPropertyList:(id)object format:NSPropertyListBinaryFormat_v1_0 options:0 error:NULL]];
            break;

        default:
            [d appendData:[NSKeyedArchiver archivedDataWithRootObject:object]];
            break;
    }

    return d;
}

extern id NULDBDecodedObject(NSData *data) {

    NSData *value = [data subdataWithRange:NSMakeRange(1, [data length] - 1)];

    char type;

    [data getBytes:&type length:1];

    switch (type) {
        case 's':
            return [[[NSString alloc] initWithData:value encoding:NSUTF8StringEncoding] autorelease];
            break;

        case 'd':
            return value;
            break;

        case 'h':
            return [NSPropertyListSerialization propertyListWithData:value options:NSPropertyListImmutable format:NULL error:NULL];
            break;

        default:
            break;
    }

    return [NSKeyedUnarchiver unarchiveObjectWithData:value];
}


@implementation NULDBUtilities

@end