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/* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif
#import "GTMReadMonitorInputStream.h"
@implementation GTMReadMonitorInputStream {
NSInputStream *_inputStream; // Encapsulated stream that does the work.
NSThread *_thread; // Thread in which this object was created.
NSArray *_runLoopModes; // Modes for calling callbacks, when necessary.
}
@synthesize readDelegate = _readDelegate;
@synthesize readSelector = _readSelector;
@synthesize runLoopModes = _runLoopModes;
// We'll forward all unhandled messages to the NSInputStream class or to the encapsulated input
// stream. This is needed for all messages sent to NSInputStream which aren't handled by our
// superclass; that includes various private run loop calls.
+ (NSMethodSignature *)methodSignatureForSelector:(SEL)selector {
return [NSInputStream methodSignatureForSelector:selector];
}
+ (void)forwardInvocation:(NSInvocation*)invocation {
[invocation invokeWithTarget:[NSInputStream class]];
}
- (BOOL)respondsToSelector:(SEL)selector {
return [_inputStream respondsToSelector:selector];
}
- (NSMethodSignature*)methodSignatureForSelector:(SEL)selector {
return [_inputStream methodSignatureForSelector:selector];
}
- (void)forwardInvocation:(NSInvocation*)invocation {
[invocation invokeWithTarget:_inputStream];
}
#pragma mark -
+ (instancetype)inputStreamWithStream:(NSInputStream *)input {
return [[self alloc] initWithStream:input];
}
- (instancetype)initWithStream:(NSInputStream *)input {
self = [super init];
if (self) {
_inputStream = input;
_thread = [NSThread currentThread];
}
return self;
}
- (instancetype)init {
[self doesNotRecognizeSelector:_cmd];
return nil;
}
#pragma mark -
- (NSInteger)read:(uint8_t *)buffer maxLength:(NSUInteger)len {
// Read from the encapsulated stream.
NSInteger numRead = [_inputStream read:buffer maxLength:len];
if (numRead > 0) {
if (_readDelegate && _readSelector) {
// Call the read selector with the buffer and number of bytes actually read into it.
BOOL isOnOriginalThread = [_thread isEqual:[NSThread currentThread]];
if (isOnOriginalThread) {
// Invoke immediately.
NSData *data = [NSData dataWithBytesNoCopy:buffer
length:(NSUInteger)numRead
freeWhenDone:NO];
[self invokeReadSelectorWithBuffer:data];
} else {
// Copy the buffer into an NSData to be retained by the performSelector,
// and invoke on the proper thread.
SEL sel = @selector(invokeReadSelectorWithBuffer:);
NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numRead];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
if (_runLoopModes) {
[self performSelector:sel
onThread:_thread
withObject:data
waitUntilDone:NO
modes:_runLoopModes];
} else {
[self performSelector:sel
onThread:_thread
withObject:data
waitUntilDone:NO];
}
#pragma clang diagnostic pop
}
}
}
return numRead;
}
- (void)invokeReadSelectorWithBuffer:(NSData *)data {
const void *buffer = data.bytes;
int64_t length = (int64_t)data.length;
id argSelf = self;
id readDelegate = _readDelegate;
if (readDelegate) {
NSMethodSignature *signature = [readDelegate methodSignatureForSelector:_readSelector];
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
[invocation setSelector:_readSelector];
[invocation setTarget:readDelegate];
[invocation setArgument:&argSelf atIndex:2];
[invocation setArgument:&buffer atIndex:3];
[invocation setArgument:&length atIndex:4];
[invocation invoke];
}
}
- (BOOL)getBuffer:(uint8_t **)buffer length:(NSUInteger *)len {
return [_inputStream getBuffer:buffer length:len];
}
- (BOOL)hasBytesAvailable {
return [_inputStream hasBytesAvailable];
}
#pragma mark Standard messages
// Pass expected messages to our encapsulated stream.
//
// We want our encapsulated NSInputStream to handle the standard messages;
// we don't want the superclass to handle them.
- (void)open {
[_inputStream open];
}
- (void)close {
[_inputStream close];
}
- (id)delegate {
return [_inputStream delegate];
}
- (void)setDelegate:(id)delegate {
[_inputStream setDelegate:delegate];
}
- (id)propertyForKey:(NSString *)key {
return [_inputStream propertyForKey:key];
}
- (BOOL)setProperty:(id)property forKey:(NSString *)key {
return [_inputStream setProperty:property forKey:key];
}
- (void)scheduleInRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode {
[_inputStream scheduleInRunLoop:aRunLoop forMode:mode];
}
- (void)removeFromRunLoop:(NSRunLoop *)aRunLoop forMode:(NSString *)mode {
[_inputStream removeFromRunLoop:aRunLoop forMode:mode];
}
- (NSStreamStatus)streamStatus {
return [_inputStream streamStatus];
}
- (NSError *)streamError {
return [_inputStream streamError];
}
@end
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