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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 /fmt_asn1length.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 'fmt_asn1length.c')
-rw-r--r-- | fmt_asn1length.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fmt_asn1length.c b/fmt_asn1length.c new file mode 100644 index 0000000..3df929b --- /dev/null +++ b/fmt_asn1length.c @@ -0,0 +1,25 @@ +#include "asn1.h" + +/* write int in least amount of bytes, return number of bytes */ +/* as used in ASN.1 length */ +size_t fmt_asn1length(char* dest,size_t l) { + /* encoding is either l%128 or (0x80+number of bytes,bytes) */ + size_t needed=(sizeof l),i; + if (l<128) { + if (dest) *dest=l&0x7f; + return 1; + } + for (i=1; i<needed; ++i) + if (!(l>>(i*8))) + break; + if (dest) { + int j=i; + *dest=0x80+i; ++dest; + while (j) { + --j; + *dest=((l>>(j*8))&0xff); + ++dest; + } + } + return i+1; +} |