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make taglen calculation yet more obvious

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This commit is contained in:
leitner
2019-09-24 21:40:02 +00:00
parent ec9280498c
commit 2af896cd1b
1 changed files with 5 additions and 4 deletions
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9
fmt_asn1tagint.c
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@@ -2,10 +2,8 @@
static size_t tagintlen(unsigned long l) {
size_t i;
size_t needed=((sizeof l)*8)/7+1;
for (i=1; i<needed; ++i)
if (!(l>>(i*7)))
break;
for (i=1; l>0x7f; ++i)
l >>= 7;
return i;
}
@@ -30,6 +28,9 @@ size_t fmt_asn1tagint(char* dest,unsigned long l) {
int main() {
char buf[10];
assert(tagintlen(0)==1);
assert(tagintlen(127)==1);
assert(tagintlen(128)==2);
assert(tagintlen(0xfffffffful)==5);
assert(fmt_asn1tagint(buf,0xfffffffful)==5 && !memcmp(buf,"\x8f\xff\xff\xff\x7f",5));
if (sizeof(long)==8) assert(fmt_asn1tagint(buf,0xfffffffffffffffful)==10 && !memcmp(buf,"\x81\xff\xff\xff\xff\xff\xff\xff\xff\x7f",10));