/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8                                   :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│                                                                              │
│  Musl Libc                                                                   │
│  Copyright © 2005-2014 Rich Felker, et al.                                   │
│                                                                              │
│  Permission is hereby granted, free of charge, to any person obtaining       │
│  a copy of this software and associated documentation files (the             │
│  "Software"), to deal in the Software without restriction, including         │
│  without limitation the rights to use, copy, modify, merge, publish,         │
│  distribute, sublicense, and/or sell copies of the Software, and to          │
│  permit persons to whom the Software is furnished to do so, subject to       │
│  the following conditions:                                                   │
│                                                                              │
│  The above copyright notice and this permission notice shall be              │
│  included in all copies or substantial portions of the Software.             │
│                                                                              │
│  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,             │
│  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF          │
│  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.      │
│  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY        │
│  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,        │
│  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE           │
│  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                      │
│                                                                              │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "third_party/musl/lookup.internal.h"

int __dns_parse(const unsigned char *r, int rlen,
		int callback(void *, int, const void *, int, const void *, int),
		void *ctx)
{
	int qdcount, ancount;
	const unsigned char *p;
	int len;

	if (rlen<12) return -1;
	if ((r[3]&15)) return 0;
	p = r+12;
	qdcount = r[4]*256 + r[5];
	ancount = r[6]*256 + r[7];
	while (qdcount--) {
		while (p-r < rlen && *p-1U < 127) p++;
		if (p>r+rlen-6)
			return -1;
		p += 5 + !!*p;
	}
	while (ancount--) {
		while (p-r < rlen && *p-1U < 127) p++;
		if (p>r+rlen-12)
			return -1;
		p += 1 + !!*p;
		len = p[8]*256 + p[9];
		if (len+10 > r+rlen-p) return -1;
		if (callback(ctx, p[1], p+10, len, r, rlen) < 0) return -1;
		p += 10 + len;
	}
	return 0;
}