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//
// PolicyDataParser.m
//
#import "SDLPolicyDataParser.h"
#import "SDLLogMacros.h"
NS_ASSUME_NONNULL_BEGIN
@implementation SDLPolicyDataParser
- (nullable NSData *)unwrap:(NSData *)wrappedData {
NSData *decodedData = nil;
@try {
NSError *errorJSONSerialization = nil;
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:wrappedData options:kNilOptions error:&errorJSONSerialization];
NSArray<NSString *> *array = dictionary[@"data"];
NSString *base64EncodedString = array[0];
if ([NSData instancesRespondToSelector:@selector(initWithBase64EncodedString:options:)]) {
decodedData = [[NSData alloc] initWithBase64EncodedString:base64EncodedString options:0];
} else {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
decodedData = [[NSData alloc] initWithBase64Encoding:base64EncodedString];
#pragma clang diagnostic pop
}
}
@catch (NSException *exception) {
decodedData = nil;
SDLLogW(@"%@", exception);
}
return decodedData;
}
- (void)parsePolicyData:(NSData *)data {
@try {
Byte *bytes = (Byte *)data.bytes;
Byte firstByte = bytes[0];
self.protocolVersion = (firstByte & 0b11100000) >> 5;
self.isResponseRequired = (firstByte & 0b00010000) != 0;
self.isHighBandwidth = (firstByte & 0b00001000) != 0;
self.isSigned = (firstByte & 0b00000100) != 0;
self.isEncrypted = (firstByte & 0b00000010) != 0;
self.hasESN = (firstByte & 0b00000001) != 0;
self.serviceType = bytes[1];
Byte thirdByte = bytes[2];
self.commandType = (thirdByte & 0b11110000) >> 4;
self.CPUDestination = (thirdByte & 0b00001000) != 0;
self.encryptionKeyIndex = (thirdByte & 0b00000111);
const int PayloadSizeOffset = 3;
if (self.isHighBandwidth) {
self.payloadSize = ntohl(*(UInt32 *)(bytes + PayloadSizeOffset));
} else {
self.payloadSize = ntohs(*(UInt16 *)(bytes + PayloadSizeOffset));
}
if (self.hasESN) {
int esnOffset = self.isHighBandwidth ? 7 : 5;
self.ESN = [NSData dataWithBytes:(bytes + esnOffset) length:8];
}
if (self.isHighBandwidth) {
int moduleMessageIdOffset = 7;
if (self.hasESN)
moduleMessageIdOffset += self.ESN.length;
self.moduleMessageId = ntohl(*(UInt32 *)(bytes + moduleMessageIdOffset));
int serverMessageIdOffset = 11;
if (self.hasESN)
serverMessageIdOffset += self.ESN.length;
self.serverMessageId = ntohl(*(UInt32 *)(bytes + serverMessageIdOffset));
int messageStatusOffset = 15;
if (self.hasESN)
messageStatusOffset += self.ESN.length;
self.messageStatus = bytes[messageStatusOffset];
}
if (self.isEncrypted) {
int ivOffset = 5;
if (self.isHighBandwidth)
ivOffset += 11;
if (self.hasESN)
ivOffset += self.ESN.length;
self.initializationVector = [NSData dataWithBytes:(bytes + ivOffset) length:16];
}
int payloadOffset = 5;
if (self.isHighBandwidth) {
payloadOffset += 11;
}
if (self.hasESN) {
payloadOffset += self.ESN.length;
}
if (self.isEncrypted) {
payloadOffset += self.initializationVector.length;
}
self.payload = [NSData dataWithBytes:(bytes + payloadOffset) length:self.payloadSize];
if (self.isSigned) {
int signatureTagOffset = (int)data.length - 16;
self.signatureTag = [NSData dataWithBytes:(bytes + signatureTagOffset) length:16];
}
}
@catch (NSException *exception) {
SDLLogW(@"%@", exception);
}
}
- (NSString *)description {
NSString *esnString = [[NSString alloc] initWithData:self.ESN encoding:NSUTF8StringEncoding];
NSMutableString *descriptionString = [NSMutableString stringWithFormat:@"Ver:%u; ", self.protocolVersion];
[descriptionString appendFormat:@"RespReq:%u; ", self.isResponseRequired];
[descriptionString appendFormat:@"HiBnd:%u; ", self.isHighBandwidth];
[descriptionString appendFormat:@"Sign:%u; ", self.isSigned];
[descriptionString appendFormat:@"Enc:%u; ", self.isEncrypted];
[descriptionString appendFormat:@"HasESN:%u; ", self.hasESN];
[descriptionString appendFormat:@"Svc:%u; ", self.serviceType];
[descriptionString appendFormat:@"Cmd:%u; ", self.commandType];
[descriptionString appendFormat:@"CPU:%u; ", self.CPUDestination];
[descriptionString appendFormat:@"EncKey:%u; ", self.encryptionKeyIndex];
[descriptionString appendFormat:@"sz:%u; ", (unsigned int)self.payloadSize];
[descriptionString appendFormat:@"ESN:%@; ", esnString];
[descriptionString appendFormat:@"mmid:%u; ", (unsigned int)self.moduleMessageId];
[descriptionString appendFormat:@"smid:%u; ", (unsigned int)self.serverMessageId];
[descriptionString appendFormat:@"status:%u; ", self.messageStatus];
[descriptionString appendFormat:@"iv:%@; ", self.initializationVector];
[descriptionString appendFormat:@"hmac:%@", self.signatureTag];
return descriptionString;
}
@end
NS_ASSUME_NONNULL_END
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