filesig_v3_sigsize
fsgp->filesig_v3_sigsize =
elfsign_switch_uint32(fsgp->filesig_v3_sigsize);
fsgp->filesig_v3_sigsize = sig_len;
filesig_extract_opaque(fsdp, filesig_v3_sigsize,
#define filesig_v3_sigsize _u2.filesig_v3.filesig_v3_sigsize
uint32_t filesig_v3_sigsize;