potential integer underflow

[KihongHeo]

Hi,

I am wondering if there might exist an integer underflow error:

1. comm_samples can be an any integer:
   

   speech_tools/speech_class/EST_wave_io.cc

   Line 796 in e2dcb2a

   if (ts.fread(&comm_samples, sizeof(int), 1) != 1)

2. If length is zero, then data_length can be a negative integer:
   

   speech_tools/speech_class/EST_wave_io.cc

   Line 839 in e2dcb2a

   data_length = (comm_samples-offset)*comm_channels;

3. So num_samples can be also a negative integer:
   

   speech_tools/speech_class/EST_wave_io.cc

   Line 857 in e2dcb2a

   *num_samples = data_length/comm_channels;

4. Call to fread with the negative integer:
   

   speech_tools/speech_class/EST_wave_io.cc

   Line 845 in e2dcb2a

   if ((n=ts.fread(file_data,get_word_size(actual_sample_type),

5. memcpy with a negative number can be vulnerable:
   

   speech_tools/base_class/EST_Token.cc

   Line 407 in e2dcb2a

   memcpy(buff,&buffer[pos],items_read*size);

Thanks for your time.