Unable to parse receipt locally using asn1c

As mentioned in apple guidelines:

https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateLocally.html

Listing 1-5 Parse the payload using asn1c

#include "Payload.h" / This header file is generated by asn1c. */

/ The receipt payload and its size. */
void *pld = NULL;
size_t pld_sz;

/ Variables used to parse the payload. Both data types are declared in Payload.h. */
Payload_t *payload = NULL;
asn_dec_rval_t rval;

/ ... Load the payload from the receipt file into pld and set pld_sz to the payload size ... */

/ Parse the buffer using the decoder function generated by asn1c. The payload variable will contain the receipt attributes. */
rval = asn_DEF_Payload.ber_decoder(NULL, &asn_DEF_Payload, (void **)&payload, pld, pld_sz, 0);

As it says on line 11, Load the payload from the receipt file into pld, i tried using following code:

const char * path = [[[[[NSBundle mainBundle] appStoreReceiptURL] path] stringByStandardizingPath] fileSystemRepresentation];
  FILE *fp = fopen(path, "rb");
  size_t sizeOfFile;
  sizeOfFile = ftell(fp);

void *pld = (char *)malloc(sizeof(char)*sizeOfFile);

  fread(pld,1,sizeOfFile, fp);
  size_t pld_sz;

But still asn_DEF_Payload.ber_decoder fails, i also tried to load pld using following code:

  NSData *receipt = [NSData dataWithContentsOfURL:[[NSBundle mainBundle] appStoreReceiptURL]];
  void * pld = (void *)[transactionReceiptData bytes];
  size_t pld_sz = (size_t)[transactionReceiptData length];

Still no success, can anyone please help how to load payload from receipt file into pld.