file_buffer(struct magic_set *ms, int fd, const char *inname __attribute__ ((__unused__)),
    const void *buf, size_t nb)
{
	int m = 0, rv = 0, looks_text = 0;
	const char *code = NULL;
	const char *code_mime = "binary";
	const char *def = "data";
	const char *ftype = NULL;
	char *rbuf = NULL;
	struct buffer b;

	buffer_init(&b, fd, buf, nb);
	ms->mode = b.st.st_mode;

	if (nb == 0) {
		def = "empty";
		goto simple;
	} else if (nb == 1) {
		def = "very short file (no magic)";
		goto simple;
	}

	if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
		looks_text = file_encoding(ms, &b, NULL, 0,
		    &code, &code_mime, &ftype);
	}

#ifdef __EMX__
	if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
		m = file_os2_apptype(ms, inname, &b);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try os2_apptype %d]\n", m);
		switch (m) {
		case -1:
			return -1;
		case 0:
			break;
		default:
			return 1;
		}
	}
#endif
#if HAVE_FORK
	/* try compression stuff */
	if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0) {
		m = file_zmagic(ms, &b, inname);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try zmagic %d]\n", m);
		if (m) {
			goto done_encoding;
		}
	}
#endif
	/* Check if we have a tar file */
	if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0) {
		m = file_is_tar(ms, &b);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try tar %d]\n", m);
		if (m) {
			if (checkdone(ms, &rv))
				goto done;
		}
	}

	/* Check if we have a JSON file */
	if ((ms->flags & MAGIC_NO_CHECK_JSON) == 0) {
		m = file_is_json(ms, &b);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try json %d]\n", m);
		if (m) {
			if (checkdone(ms, &rv))
				goto done;
		}
	}

	/* Check if we have a CDF file */
	if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
		m = file_trycdf(ms, &b);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try cdf %d]\n", m);
		if (m) {
			if (checkdone(ms, &rv))
				goto done;
		}
	}
#ifdef BUILTIN_ELF
	if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && nb > 5 && fd != -1) {
		file_pushbuf_t *pb;
		/*
		 * We matched something in the file, so this
		 * *might* be an ELF file, and the file is at
		 * least 5 bytes long, so if it's an ELF file
		 * it has at least one byte past the ELF magic
		 * number - try extracting information from the
		 * ELF headers that cannot easily be  extracted
		 * with rules in the magic file. We we don't
		 * print the information yet.
		 */
		if ((pb = file_push_buffer(ms)) == NULL)
			return -1;

		rv = file_tryelf(ms, &b);
		rbuf = file_pop_buffer(ms, pb);
		if (rv == -1) {
			free(rbuf);
			rbuf = NULL;
		}
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try elf %d]\n", m);
	}
#endif

	/* try soft magic tests */
	if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0) {
		m = file_softmagic(ms, &b, NULL, NULL, BINTEST, looks_text);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try softmagic %d]\n", m);
		if (m == 1 && rbuf) {
			if (file_printf(ms, "%s", rbuf) == -1)
				goto done;
		}
		if (m) {
			if (checkdone(ms, &rv))
				goto done;
		}
	}

	/* try text properties */
	if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {

		m = file_ascmagic(ms, &b, looks_text);
		if ((ms->flags & MAGIC_DEBUG) != 0)
			(void)fprintf(stderr, "[try ascmagic %d]\n", m);
		if (m) {
			if (checkdone(ms, &rv))
				goto done;
		}
	}

simple:
	/* give up */
	if (m == 0) {
		m = 1;
		rv = file_default(ms, nb);
		if (rv == 0)
			if (file_printf(ms, "%s", def) == -1)
				rv = -1;
	}
 done:
	if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
		if (ms->flags & MAGIC_MIME_TYPE)
			if (file_printf(ms, "; charset=") == -1)
				rv = -1;
		if (file_printf(ms, "%s", code_mime) == -1)
			rv = -1;
	}
#if HAVE_FORK
 done_encoding:
#endif
	free(rbuf);
	buffer_fini(&b);
	if (rv)
		return rv;

	return m;
}
Unknown