filesig_v1_sigsize
fsgp->filesig_v1_sigsize =
elfsign_switch_uint32(fsgp->filesig_v1_sigsize);
fsgp->filesig_v1_sigsize = sig_len;
filesig_extract_opaque(fsdp, filesig_v1_sigsize,
uint32_t filesig_v1_sigsize;
#define filesig_v1_sigsize _u2.filesig_v1.filesig_v1_sigsize