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Add a test for tell(). Turns out we can make it fail by writing zeros.

--- a/tests/ectest.c

+++ b/tests/ectest.c

@@ -98,19 +98,32 @@

   ec_byte_writeclear(&buf);

   fprintf(stderr,"Testing random streams...\n");

   srand(0);

-  for(i=0;i<1024;i++){

+  for(i=0;i<4096;i++){

     unsigned *data;

     int       j;

+    int tell_bits;

+    int zeros;

     ft=rand()/((RAND_MAX>>9)+1)+512;

     sz=rand()/((RAND_MAX>>9)+1);

     data=(unsigned *)malloc(sz*sizeof(*data));

     ec_byte_writeinit(&buf);

     ec_enc_init(&enc,&buf);

+    zeros = rand()%13==0;

     for(j=0;j<sz;j++){

-      data[j]=rand()%ft;

+      if (zeros)

+        data[j]=0;

+      else

+        data[j]=rand()%ft;

       ec_enc_uint(&enc,data[j],ft);

     }

+    tell_bits = ec_enc_tell(&enc, 0);

     ec_enc_done(&enc);

+    tell_bits -= 8*ec_byte_bytes(&buf);

+    if (tell_bits > 0 || tell_bits < -7)

+    {

+       printf ("tell() failed with %d bit offset\n", tell_bits);

+       return -1;

+    }

     ec_byte_readinit(&buf,ec_byte_get_buffer(&buf),ec_byte_bytes(&buf));

     ec_dec_init(&dec,&buf);

     for(j=0;j<sz;j++){