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author | Simon Rettberg | 2014-03-15 01:49:50 +0100 |
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committer | Simon Rettberg | 2014-03-15 01:49:50 +0100 |
commit | bedd2e7ccb1595c23e159eaa952ae1b0b5a3d2ad (patch) | |
tree | c7d1995a09f6ed0c4e6873252e957d72f5d07d07 /scan_asn1tag.c | |
download | ldadp-bedd2e7ccb1595c23e159eaa952ae1b0b5a3d2ad.tar.gz ldadp-bedd2e7ccb1595c23e159eaa952ae1b0b5a3d2ad.tar.xz ldadp-bedd2e7ccb1595c23e159eaa952ae1b0b5a3d2ad.zip |
Lean and mean initial commit
Not much functionality yet
Diffstat (limited to 'scan_asn1tag.c')
-rw-r--r-- | scan_asn1tag.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/scan_asn1tag.c b/scan_asn1tag.c new file mode 100644 index 0000000..acf0c57 --- /dev/null +++ b/scan_asn1tag.c @@ -0,0 +1,17 @@ +#include "asn1.h" + +size_t scan_asn1tag(const char* src,const char* max,enum asn1_tagclass* tc,enum asn1_tagtype* tt,unsigned long* tag) { + if (max<=src) return 0; + *tc=(*src&0xC0); + *tt=(*src&0x20); +/* The lower 5 bits are the tag, unless it's 0x1f, in which case the + * next bytes are the tag: always take the lower 7 bits; the last byte + * in the sequence is marked by a cleared high bit */ + if ((*src & 0x1f) == 0x1f) { + size_t res=scan_asn1tagint(src+1,max,tag); + return res+!!res; /* add 1 unless it's 0, then leave 0 */ + } else { + *tag=*src&0x1f; + return 1; + } +} |