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fmt_ip6 compresses at best spot, not at first spot (Nikola Vladov)

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This commit is contained in:
leitner 2007-03-04 13:13:19 +00:00
parent ff1805d310
commit b0d5046428
3 changed files with 45 additions and 33 deletions
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1
CHANGES
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@ -4,6 +4,7 @@
connections came in and got newer, higher descriptors since the last connections came in and got newer, higher descriptors since the last
io_timeouted loop. (Dirk Engling) io_timeouted loop. (Dirk Engling)
add some int overflow check macros to rangecheck.h add some int overflow check macros to rangecheck.h
fmt_ip6 compresses at best spot, not at first spot (Nikola Vladov)
0.25: 0.25:
array_allocate no longer truncates the array array_allocate no longer truncates the array

63
socket/fmt_ip6.c
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@ -5,44 +5,41 @@
unsigned int fmt_ip6(char *s,const char ip[16]) unsigned int fmt_ip6(char *s,const char ip[16])
{ {
unsigned int len; unsigned long len,temp, k, pos0=0,len0=0, pos1=0, compr=0;
unsigned int i;
unsigned int temp;
unsigned int compressing;
unsigned int compressed;
int j;
len = 0; compressing = 0; compressed = 0; for (k=0; k<16; k+=2) {
for (j=0; j<16; j+=2) { if (ip[k]==0 && ip[k+1]==0) {
if (j==12 && ip6_isv4mapped(ip)) { if (!compr) {
temp=ip4_fmt(s,ip+12); compr=1;
len+=temp; pos1=k;
}
if (k==14) { k=16; goto last; }
} else if (compr) {
last:
if ((temp=k-pos1) > len0) {
len0=temp;
pos0=pos1;
}
compr=0;
}
}
for (len=0,k=0; k<16; k+=2) {
if (k==12 && ip6_isv4mapped(ip)) {
len += ip4_fmt(s,ip+12);
break; break;
} }
temp = ((unsigned long) (unsigned char) ip[j] << 8) + if (pos0==k && len0) {
(unsigned long) (unsigned char) ip[j+1]; if (k==0) { ++len; if (s) *s++ = ':'; }
if (temp == 0 && !compressed) { ++len; if (s) *s++ = ':';
if (!compressing) { k += len0-2;
compressing=1; continue;
if (j==0) {
if (s) *s++=':'; ++len;
} }
temp = ((unsigned long) (unsigned char) ip[k] << 8) +
(unsigned long) (unsigned char) ip[k+1];
temp = fmt_xlong(s,temp); len += temp; if (s) s += temp;
if (k<14) { ++len; if (s) *s++ = ':'; }
} }
} else {
if (compressing) {
compressing=0; ++compressed;
if (s) *s++=':'; ++len;
}
i = fmt_xlong(s,temp); len += i; if (s) s += i;
if (j<14) {
if (s) *s++ = ':';
++len;
}
}
}
if (compressing) { if (s) *s++=':'; ++len; }
/* if (s) *s=0; */
return len; return len;
} }

14
test/fmt_ip6.c Normal file
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@ -0,0 +1,14 @@
#include "ip6.h"
#include <assert.h>
int main() {
char buf[100];
int i;
buf[i=fmt_ip6(buf,"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")]=0; assert(i==2 && !strcmp(buf,"::"));
buf[i=fmt_ip6(buf,"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")]=0; assert(i==3 && !strcmp(buf,"::1"));
buf[i=fmt_ip6(buf,"\xfe\xc0\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00\x00\x00\x01")]=0;
assert(i==16 && !strcmp(buf,"fec0:0:0:ffff::1"));
buf[i=fmt_ip6(buf,"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x7f\x00\x00\x01")]=0;
assert(i==16 && !strcmp(buf,"::ffff:127.0.0.1"));
return 0;
}