deflate_index
int deflate_index_build(FILE *in, off_t span, struct deflate_index **built) {
struct deflate_index *index = malloc(sizeof(struct deflate_index));
ptrdiff_t deflate_index_extract(FILE *in, struct deflate_index *index,
struct deflate_index *index = NULL;
void deflate_index_free(struct deflate_index *index) {
static struct deflate_index *add_point(struct deflate_index *index, off_t in,
int deflate_index_build(FILE *in, off_t span, struct deflate_index **built);
ptrdiff_t deflate_index_extract(FILE *in, struct deflate_index *index,
void deflate_index_free(struct deflate_index *index);