57 lines
1.3 KiB
Objective-C
57 lines
1.3 KiB
Objective-C
//
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// ORSSerialBuffer.m
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// ORSSerialPort
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//
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// Created by Andrew Madsen on 9/6/15.
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// Copyright (c) 2015 Open Reel Software. All rights reserved.
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//
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#import "ORSSerialBuffer.h"
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@interface ORSSerialBuffer ()
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@property (nonatomic, strong) NSMutableData *internalBuffer;
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@end
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@implementation ORSSerialBuffer
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- (instancetype)init NS_UNAVAILABLE
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{
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[NSException raise:NSInternalInconsistencyException format:@"Use -[ORSSerialBuffer initWithMaximumLength:]"];
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return nil;
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}
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- (instancetype)initWithMaximumLength:(NSUInteger)maxLength
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{
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self = [super init];
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if (self) {
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_internalBuffer = [NSMutableData data];
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_maximumLength = maxLength;
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}
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return self;
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}
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- (void)appendData:(NSData *)data
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{
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[self willChangeValueForKey:@"internalBuffer"];
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[self.internalBuffer appendData:data];
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if ([self.internalBuffer length] > self.maximumLength) {
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NSRange rangeToDelete = NSMakeRange(0, [self.internalBuffer length] - self.maximumLength);
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[self.internalBuffer replaceBytesInRange:rangeToDelete withBytes:NULL length:0];
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}
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[self didChangeValueForKey:@"internalBuffer"];
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}
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- (void)clearBuffer
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{
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self.internalBuffer = [NSMutableData data];
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}
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#pragma mark - Properties
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+ (NSSet *)keyPathsForValuesAffectingData { return [NSSet setWithObjects:@"internalData", nil]; }
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- (NSData *)data { return self.internalBuffer; }
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@end
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