Function do_alloc

src/lib/cbfs.c:464–513

}

static void *do_alloc(union cbfs_mdata *mdata, struct region_device *rdev,
		      cbfs_allocator_t allocator, void *arg, size_t *size_out,
		      bool skip_verification)
{
	size_t size = region_device_sz(rdev);
	void *loc = NULL;

	uint32_t compression = CBFS_COMPRESS_NONE;
	const struct cbfs_file_attr_compression *cattr = cbfs_find_attr(mdata,
				CBFS_FILE_ATTR_TAG_COMPRESSION, sizeof(*cattr));
	if (cattr) {
		compression = be32toh(cattr->compression);
		size = be32toh(cattr->decompressed_size);
	}

	if (size_out)
		*size_out = size;

	/* allocator == NULL means do a cbfs_map() */
	if (allocator) {
		loc = allocator(arg, size, mdata);
	} else if (compression == CBFS_COMPRESS_NONE) {
		void *mapping = rdev_mmap_full(rdev);
		if (!mapping)
			return NULL;
		if (cbfs_file_hash_mismatch(mapping, size, mdata, skip_verification)) {
			rdev_munmap(rdev, mapping);
			return NULL;
		}
		return mapping;
	} else if (!cbfs_cache.size) {
		/* In order to use the cbfs_cache you need to add a CBFS_CACHE to your
		 * memlayout. */
		ERROR("Cannot map compressed file %s without cbfs_cache\n", mdata->h.filename);
		return NULL;
	} else {
		loc = mem_pool_alloc(&cbfs_cache, size);
	}

	if (!loc) {
		ERROR("'%s' allocation failure\n", mdata->h.filename);
		return NULL;
	}

	size = cbfs_load_and_decompress(rdev, loc, size, compression, mdata, skip_verification);
	if (!size)
		return NULL;

	return loc;
}

static enum cb_err check_or_query_type(const union cbfs_mdata *mdata, enum cbfs_type *type)
{