CODEWITHSUNDEEP
iosobjective-ccpointersnsdate
Suhas_United
Suhas_United

Reputation: 237

Getting bytes form nsdata apends extra junk characters

I am trying to get bytes from nsdata into char* but the length of char* is more than length of nsdata and contains extra junk characters appended at the last.The code:

 NSData * newData=[self dataFromHexString:trimmedHex];
 NSLog(@"new data length %d",[newData length]);
 char * ciphertext=(char*)[newData bytes];
 NSLog(@"length of ciphertext %zd",strlen(ciphertext));

The log:

2013-08-02 17:02:28.175 AES[4187:11303] new data length 128
2013-08-02 17:02:28.176 AES[4187:11303] length of ciphertext 144

stuck with this from morning.:(

const char * ciphertextTemp=(const char*)[newData bytes];
char ciphertext[[newData length]+1];
for (int len=0; len<[self length];len++) {
    ciphertext[len]=ciphertextTemp[len];
}
ciphertext[[self length]]='\0';

Upvotes: 0

Views: 288

Answers (1)

alk
alk

Reputation: 70981

Could it be the 0-terminator is missing for the sequences of chars ciphertext is pointing to?

Update:

Instead of

for (int len=0; len<[self length];len++) {
  ciphertext[len]=ciphertextTemp[len];
}
ciphertext[[self length]]='\0';

you could simply do:

strncpy(ciphertext, ciphertextTemp, [newData length]);
ciphertext[[self length] - 1]='\0';

Upvotes: 1

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