Function ifwi_write

util/cbfstool/ifwitool.c:1186–1268

* Follows these steps to re-create image: * 1. Write any non-IFWI prefix. * 2. Write out BPDT header and entries. * 3. Write sub-partition buffers to respective offsets. * 4. Write any non-IFWI suffix. * * While performing the above steps, make sure that any empty holes are filled * with FF. */

 * with FF.
 */
static void ifwi_write(const char *image_name)
{
	struct bpdt_entry *s = find_entry_by_type(S_BPDT_TYPE);
	assert(s);

	size_t ifwi_start, ifwi_end, file_end;

	ifwi_start = ifwi_image.input_ifwi_start_offset;
	ifwi_end = ifwi_start + ALIGN_UP(s->offset + s->size, 4 * KiB);
	file_end = ifwi_end + (buffer_size(&ifwi_image.input_buff) -
			       ifwi_image.input_ifwi_end_offset);

	struct buffer b;

	alloc_buffer(&b, file_end, "Final-IFWI");

	uint8_t *input_data = buffer_get(&ifwi_image.input_buff);
	uint8_t *output_data = buffer_get(&b);

	DEBUG("ifwi_start:0x%zx, ifwi_end:0x%zx, file_end:0x%zx\n", ifwi_start,
	      ifwi_end, file_end);

	/* Copy non-IFWI prefix, if any. */
	memcpy(output_data, input_data, ifwi_start);

	DEBUG("Copied non-IFWI prefix (offset=0x0, size=0x%zx).\n", ifwi_start);

	struct buffer ifwi;
	buffer_splice(&ifwi, &b, ifwi_start, ifwi_end - ifwi_start);
	uint8_t *ifwi_data = buffer_get(&ifwi);

	/* Copy sub-partitions using pack_order. */
	struct bpdt_entry *curr;
	struct buffer *subpart_buf;
	int i, type;
	for (i = 0; i < MAX_SUBPARTS; i++) {
		type = bpdt_pack_order[i];

		if (type == S_BPDT_TYPE)
			continue;

		curr = find_entry_by_type(type);

		if ((curr == NULL) || (curr->size == 0))
			continue;

		subpart_buf = &ifwi_image.subpart_buf[type];

		DEBUG("curr->offset=0x%x, curr->size=0x%x, type=%d, "
		      "write_size=0x%zx\n", curr->offset, curr->size, type,
		      buffer_size(subpart_buf));

		assert((curr->offset + buffer_size(subpart_buf)) <=
		       buffer_size(&ifwi));

		memcpy(ifwi_data + curr->offset, buffer_get(subpart_buf),
		       buffer_size(subpart_buf));
	}