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  1. .TH fmt_asn1derlength 3
  2. .SH NAME
  3. fmt_asn1derlength \- encode unsigned integer like ASN.1 DER length
  4. .SH SYNTAX
  5. .B #include <libowfat/fmt.h>
  6. size_t \fBfmt_asn1derlength\fP(char *\fIdest\fR,unsigned long long \fIsource\fR);
  7. .SH DESCRIPTION
  8. fmt_asn1derlength encodes an unsigned integer using the ASN.1 DER
  9. for encoding tag lengths. This can take from 1 byte (0-0x7f) up to
  10. sizeof(source)+1 bytes.
  11. If \fIdest\fR equals FMT_LEN (i.e. is NULL), fmt_asn1derlength returns the
  12. number of bytes it would have written.
  13. For convenience, fmt.h defines the integer FMT_ASN1LENGTH to be big
  14. enough to contain every possible fmt_asn1derlength output.
  15. .SH "SEE ALSO"
  16. scan_asn1derlength(3)