Function start_loose_object_common

object-file.c:654–698

* Common steps for loose object writers to start writing loose * objects: * * - Create tmpfile for the loose object. * - Setup zlib stream for compression. * - Start to feed header to zlib stream. * * Returns a "fd", which should later be provided to * end_loose_object_common(). */

 * end_loose_object_common().
 */
static int start_loose_object_common(struct odb_source_loose *loose,
				     struct strbuf *tmp_file,
				     const char *filename, unsigned flags,
				     git_zstream *stream,
				     unsigned char *buf, size_t buflen,
				     struct git_hash_ctx *c, struct git_hash_ctx *compat_c,
				     char *hdr, int hdrlen)
{
	const struct git_hash_algo *algo = loose->base.odb->repo->hash_algo;
	const struct git_hash_algo *compat = loose->base.odb->repo->compat_hash_algo;
	int fd;
	struct repo_config_values *cfg = repo_config_values(the_repository);

	fd = create_tmpfile(loose->base.odb->repo, tmp_file, filename);
	if (fd < 0) {
		if (flags & ODB_WRITE_OBJECT_SILENT)
			return -1;
		else if (errno == EACCES)
			return error(_("insufficient permission for adding "
				       "an object to repository database %s"),
				     loose->base.path);
		else
			return error_errno(
				_("unable to create temporary file"));
	}

	/*  Setup zlib stream for compression */
	git_deflate_init(stream, cfg->zlib_compression_level);
	stream->next_out = buf;
	stream->avail_out = buflen;
	algo->init_fn(c);
	if (compat && compat_c)
		compat->init_fn(compat_c);

	/*  Start to feed header to zlib stream */
	stream->next_in = (unsigned char *)hdr;
	stream->avail_in = hdrlen;
	while (git_deflate(stream, 0) == Z_OK)
		; /* nothing */
	git_hash_update(c, hdr, hdrlen);
	if (compat && compat_c)
		git_hash_update(compat_c, hdr, hdrlen);

	return fd;
}

/**
 * Common steps for the inner git_deflate() loop for writing loose