Function read_subpart_buf

util/cbfstool/ifwitool.c:638–696

* Read the content of a sub-partition from input file and store it in * ifwi_image.subpart_buf[SUB-PARTITION_TYPE]. * * Returns the maximum offset occupied by the sub-partitions. */

 * Returns the maximum offset occupied by the sub-partitions.
 */
static size_t read_subpart_buf(void *data, size_t size, struct bpdt_entry *e,
			       size_t count)
{
	size_t i, type;
	struct buffer *buf;
	size_t max_offset = 0;

	for (i = 0; i < count; i++) {
		type = e[i].type;

		if (type >= MAX_SUBPARTS) {
			ERROR("Invalid sub-partition type %zd.\n", type);
			exit(-1);
		}

		if (buffer_size(&ifwi_image.subpart_buf[type])) {
			ERROR("Multiple sub-partitions of type %zd(%s).\n",
			      type, subparts[type].name);
			exit(-1);
		}

		if (e[i].size == 0) {
			INFO("Dummy sub-partition %zd(%s). Skipping.\n", type,
			     subparts[type].name);
			continue;
		}

		assert((e[i].offset + e[i].size) <= size);

		/*
		 * Sub-partitions in IFWI image are not in the same order as
		 * in BPDT entries. BPDT entries are in header_order whereas
		 * sub-partition offsets in the image are in pack_order.
		 */
		if ((e[i].offset + e[i].size) > max_offset)
			max_offset = e[i].offset + e[i].size;

		/*
		 * S-BPDT sub-partition contains information about all the
		 * non-critical sub-partitions. Thus, size of S-BPDT
		 * sub-partition equals size of S-BPDT plus size of all the
		 * non-critical sub-partitions. Thus, reading whole of S-BPDT
		 * here would be redundant as the non-critical partitions are
		 * read and allocated buffers separately. Also, S-BPDT requires
		 * special handling for reading header and entries.
		 */
		if (type == S_BPDT_TYPE)
			continue;

		buf = &ifwi_image.subpart_buf[type];

		alloc_buffer(buf, e[i].size, subparts[type].name);
		memcpy(buffer_get(buf), (uint8_t *)data + e[i].offset,
		       e[i].size);
	}

	assert(max_offset);
	return max_offset;