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// SDLSmartDeviceLinkProtocolMessageAssembler.m
//
#import "SDLProtocolMessageAssembler.h"
#import "SDLLogMacros.h"
#import "SDLProtocolHeader.h"
#import "SDLProtocolMessage.h"
NS_ASSUME_NONNULL_BEGIN
@interface SDLProtocolMessageAssembler ()
@property (nonatomic, nullable, strong) NSMutableDictionary<NSNumber *, NSData *> *parts;
@end
@implementation SDLProtocolMessageAssembler
- (instancetype)initWithSessionID:(UInt8)sessionID {
if (self = [super init]) {
_sessionID = sessionID;
}
return self;
}
- (void)handleMessage:(SDLProtocolMessage *)message withCompletionHandler:(SDLMessageAssemblyCompletionHandler)completionHandler {
// Validate input
if (message.header.sessionID != self.sessionID) {
SDLLogE(@"Message part sent to the wrong assembler. This session id: %d, message session id: %d", self.sessionID, message.header.sessionID);
return;
}
if (self.parts == nil) {
self.parts = [NSMutableDictionary dictionary];
}
// Determine which frame it is and save it.
// Note: frames are numbered 1,2,3, ..., 0. Always 0 for last frame.
if (message.header.frameType == SDLFrameTypeFirst) {
// If it's the first-frame, extract the meta-data
self.expectedBytes = NSSwapBigIntToHost(((UInt32 *)message.payload.bytes)[0]);
self.frameCount = NSSwapBigIntToHost(((UInt32 *)message.payload.bytes)[1]);
self.parts[@"firstframe"] = message.payload;
} else if (message.header.frameType == SDLFrameTypeConsecutive) {
// Save the frame w/ frame# as the key
NSInteger frameNumber = message.header.frameData;
NSNumber *frameNumberObj = @(frameNumber);
self.parts[frameNumberObj] = message.payload;
}
// If we have all the parts, assemble it and execute the completion handler.
SDLProtocolMessage *assembledMessage = nil;
if (self.parts.count == self.frameCount + 1) { // +1 since we also require the first-frame
// Create the header
SDLProtocolHeader *header = message.header.copy;
header.frameType = SDLFrameTypeSingle;
header.frameData = SDLFrameInfoSingleFrame;
// Create the payload
NSMutableData *payload = [NSMutableData data];
for (unsigned int i = 1; i < self.frameCount; i++) {
NSData *dataToAppend = self.parts[@(i)];
[payload appendData:dataToAppend];
}
// Append the last frame, it has a frame # of 0.
NSData *dataToAppend = self.parts[@0];
[payload appendData:dataToAppend];
// Validation
if (payload.length != self.expectedBytes) {
SDLLogW(@"Collected bytes size of %lu not equal to expected size of %i.", (unsigned long)payload.length, (unsigned int)self.expectedBytes);
}
// Create the message.
assembledMessage = [SDLProtocolMessage messageWithHeader:header andPayload:payload];
// Execute completion handler.
if (completionHandler != nil) {
completionHandler(YES, assembledMessage);
}
// Done with this data, release it.
self.parts = nil;
} else {
// Not done, let caller know
if (completionHandler != nil) {
completionHandler(NO, nil);
}
}
}
@end
NS_ASSUME_NONNULL_END
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