1scan_asn1dertag(3)         Library Functions Manual         scan_asn1dertag(3)
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NAME

6       scan_asn1dertag  -  decode  an  unsigned  integer from ASN.1 DER length
7       encoding
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SYNTAX

10       #include <scan.h>
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12       size_t scan_asn1dertag(const char *src,size_t  len,unsigned  long  long
13       *dest);
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DESCRIPTION

16       scan_asn1dertag  decodes  an unsigned integer in ASN.1 DER tag encoding
17       from a memory area holding binary data.  It writes the decode value  in
18       dest and returns the number of bytes it read from src.
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20       scan_asn1dertag  never  reads  more  than  len  bytes from src.  If the
21       sequence is longer than that, or the memory area  contains  an  invalid
22       sequence, scan_asn1dertag returns 0 and does not touch dest.
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24       The  length  of the longest ASN.1 DER length sequence is 128 bytes.  In
25       practice the largest sequence is sizeof(*dest)+1.
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SEE ALSO

28       fmt_asn1dertag(3)
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32                                                            scan_asn1dertag(3)