More information on failed tape verify/restore

I modified readh_header_block_from_stream in libmondo-stream.c to

1) dump out the contents of each buffer read from the tape.
2) to set retval to 1 if it thinks it sees a bad header as this might stop
it heading off into "la-la" land .

Thus:

read_header_block_from_stream(long long *plen, char *filename,
							  int
*pcontrol_char)
{

	/*@ buffers ***************************************************** */
	char *tempblock;

	/*@ int ********************************************************* */
	int i, retval = 0;

	/*@ end vars *************************************************** */

	tempblock = (char *) malloc((size_t) TAPE_BLOCK_SIZE);

	for (i = 0; i < (int) TAPE_BLOCK_SIZE; i++) {
		tempblock[i] = 0;
	}
	while (!(*pcontrol_char = tempblock[7000])) {
		g_tape_posK += fread(tempblock, 1, (size_t) TAPE_BLOCK_SIZE,
g_tape_stream) / 1024;
		print_hex_dump_bytes(" ", DUMP_PREFIX_OFFSET, tempblock,
TAPE_BLOCK_SIZE);
	}
	memcpy((char *) plen, tempblock + 7001, sizeof(long long));
	if (strcmp(tempblock + 6000 + *pcontrol_char, STR_HEADER)) {
		log_it("Bad header block at %ld K", (long) g_tape_posK);
		retval = 1;
	}

I attach the log of stdout obtained by doing:

./mondoarchive -b65536 -Vt -d/dev/st0 | tee ./verify.log

showing the content of each 128k buffer.

PS I don't quite "get" what that code is doing with the 7000 byte/6000 byte
offsets etc..  Please could you clarify for the slow on the uptake - I would
have expected to be looking at the start of each buffer for headers

Are those 128k block that are mostly nulls the header blocks?

Thanks
Dave

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