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needed byte calculation was wrong: *7/8 instead of *8/7

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leitner
2019-09-24 16:05:40 +00:00
parent 56d1d974dc
commit 8cf92eb6be
1 changed files with 2 additions and 1 deletions
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3
fmt_asn1tagint.c
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@@ -4,7 +4,7 @@
/* Store big endian, 7 bits at a time, set high bit in all but last byte */
/* Return number of bytes needed. Only write if dest!=NULL */
size_t fmt_asn1tagint(char* dest,unsigned long l) {
size_t needed=((sizeof l)*7)/8,i;
size_t needed=((sizeof l)*8)/7+1,i;
for (i=1; i<needed; ++i)
if (!(l>>(i*7)))
break;
@@ -28,5 +28,6 @@ int main() {
assert(fmt_asn1tagint(buf,1)==1 && !memcmp(buf,"\x01",1));
assert(fmt_asn1tagint(buf,0x7f)==1 && !memcmp(buf,"\x7f",1));
assert(fmt_asn1tagint(buf,0x80)==2 && !memcmp(buf,"\x81\x00",2));
assert(fmt_asn1tagint(buf,0xffffffff)==5 && !memcmp(buf,"\x8f\xff\xff\xff\x7f",5));
}
#endif