[vorbis-dev] Trouble decoding number of codebooks

[ots1 at cs.waikato.ac.nz]

I'm having trouble decoding the number of codebooks out of an ogg file,
and was wondering if anyone here could lend a hand?

I read in the sync pattern, and I think the codebook dimensions properly,
but when I try and read in the number of codebook entries, I get a number
larger than the number of bytes in the file, which I have to assume is
wrong :)

Anyway this is how I read in the numbers :

void readCodeBooks(ifstream *file, int codebookCount)
{
  //read in the 24 bit sync pattern
  unsigned char *c = readBytes(file, 3);

  //read the codebook dimensions
  unsigned char *dimensions = readBytes(file,2);
  int codebookDimensions = (int)convertArray2(dimensions, 2);

  //read codebook entries
  unsigned char *entries = readBytes(file,3);
  long codebookEntries = convertArray2(entries,3);
}

long convertArray2(unsigned char *array, int size)
{
  //reverse the array
  unsigned char revArray[size];
  for(int i = size - 1; i >= 0; i--)
    revArray[(size-1) - i] = array[i];

  //return a pointer to a long
  long *result = (long *)revArray;
  return *result;
}

The results that I get from the code are :

 Sync Pattern (starting byte #269) : 42 43 56   (outputed as integers)
 Codebook dimensions (starting byte #272) : 256
 Codebook entries (starting byte #274) : 4194304

Cheers for the help,

Oliver Sneyd
ots1 at cs.waikato.ac.nz

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