decodeBytesWithMinimumLength.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initRequiringSecureCoding:YES];
        int *integers = malloc(sizeof(int) * 3);
        integers[0] = 0;
        integers[1] = 1;
        integers[2] = 2;
        [archiver encodeBytes:integers length:sizeof(int) * 3];
        [archiver finishEncoding];
        NSData *data = archiver.encodedData;
        
        NSError * _Nullable error = nil;
        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingFromData:data error:&error];
        assert(error == nil);
        int *decoded = [unarchiver decodeBytesWithMinimumLength:sizeof(int) * 3];
        assert(decoded != NULL);
        assert(decoded[0] == integers[0]);
        assert(decoded[1] == integers[1]);
        assert(decoded[2] == integers[2]);
        free(integers);
        
        int *invalidPointer = [unarchiver decodeBytesWithMinimumLength:sizeof(int) * 100];
        assert(invalidPointer == NULL);
    }
    
    return 0;
}