Postamble is not recognized

[GoogleCodeExporter]

This is the current code that is provided for the postamble check:

// check for a postamble sequence byte
if (b != postamble[postambleCounter]) {
  postambleCounter = 0;
}
else {
  ++postambleCounter;
}

So let's pretend there accidentaly have been several bytes that matched the 
beginning of the postamble. Then there is byte x which does not match anymore 
(because we've matched data agains the postamble until now). So currently the 
library will throw away this byte x and continue to check x+1. But what if byte 
x has been the correct beginning of the postamble?

This leads to the, I grant, very rare case that the postamble will not be 
recognized.

I would suggest following fix:

// check for a postamble sequence byte
if (b != postamble[postambleCounter])
{
  // the byte that failed could be the beginning
  // of a postamble sequence again ...
  if (b == postamble[0])
  {
    postambleCounter = 1;
  }
  else
  {
    postambleCounter = 0;
  }
}
else
{
  ++postambleCounter;
}

Original issue reported on code.google.com by floschn...@gmail.com on 19 Sep 2013 at 1:26