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int _check_buf(PerlIO *infile, Buffer *buf, int size, int min_size);
off_t _file_size(PerlIO *infile);
#ifdef AUDIO_SCAN_DEBUG
void hexdump(unsigned char *data, uint32_t size);
#endif

// Based on code from http://www.agner.org/optimize/
// Test code to count clock cycles of some portion of the code
// Wrap code to be tested with CLOCK_START(n) ... CLOCK_END(n)
// where n is a count of iterations to run.  Code must support
// being run more than once.
#ifdef CLOCK_CYCLE_TESTS

// Read time stamp counter
// The return value is the internal clock count
int64_t ReadTSC() {
   int res[2];                              // store 64 bit result here

   #if defined (_LP64)                      // 64 bit mode
      __asm__ __volatile__  (               // serialize (save rbx)