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16 lines
416 B
C
16 lines
416 B
C
#include "fmt.h"
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/* write int in least amount of bytes, return number of bytes */
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/* as used in ASN.1 DER tag */
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size_t fmt_asn1dertag(char* dest,unsigned long long l) {
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/* encoding is either l%128 or (0x80+number of bytes,bytes) */
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size_t n=0,i;
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unsigned long long t;
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for (t=l, n=1; t>0x7f; t>>=7) ++n;
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for (i=0; i<n; ++i) {
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if (dest) dest[n-i-1]=((i!=0)<<7) | (l&0x7f);
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l>>=7;
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}
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return i;
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}
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