int zlib_decomp(int len, char *in, char **out)
{
int oavail = 0, olen = 0;
int err;
zi.next_in = (void *) in;
zi.avail_in = len;
zi.next_out = (void *) zbuf;
zi.avail_out = zbuf_size;
while(1) {
oavail = zi.avail_out;
if( (err=inflate(&zi, Z_SYNC_FLUSH)) != Z_OK ) {
vtun_syslog(LOG_ERR,"Inflate error %d len %d", err, len);
return -1;
}
olen += oavail - zi.avail_out;
if(!zi.avail_in)
break;
if( expand_zbuf(&zi,100) ) {
vtun_syslog( LOG_ERR, "Can't expand compression buffer");
return -1;
}
}
*out = (void *) zbuf;
return olen;
}
/*
* This functions _MUST_ consume all incoming bytes in one pass,
* That's why we expand buffer dynamically.
* Practice shows that buffer will not grow larger that 16K.
*/
int zlib_comp(int len, char *in, char **out)
{
int oavail, olen = 0;
int err;
zd.next_in = (void *) in;
zd.avail_in = len;
zd.next_out = (void *) zbuf;
zd.avail_out = zbuf_size;
while(1) {
oavail = zd.avail_out;
if( (err=deflate(&zd, Z_SYNC_FLUSH)) != Z_OK ){
vlog(LOG_ERR,"Deflate error %d",err);
return -1;
}
olen += oavail - zd.avail_out;
if(!zd.avail_in)
break;
if( expand_zbuf(&zd,100) ) {
vlog( LOG_ERR, "Can't expand compression buffer");
return -1;
}
}
*out = (void *) zbuf;
return olen;
}
