1 files changed, 95 insertions, 0 deletions
diff --git a/package/cfgfs/src/unwraps.c b/package/cfgfs/src/unwraps.c
new file mode 100644
index 000000000..d03f297e3
--- /dev/null
+++ b/package/cfgfs/src/unwraps.c
@@ -0,0 +1,95 @@
+/* $MirOS: contrib/hosted/fwcf/unwraps.c,v 1.10 2006/09/26 10:25:03 tg Exp $ */
+
+/*-
+ * Copyright (c) 2006
+ *	Thorsten Glaser <tg@mirbsd.de>
+ *
+ * Licensee is hereby permitted to deal in this work without restric-
+ * tion, including unlimited rights to use, publicly perform, modify,
+ * merge, distribute, sell, give away or sublicence, provided all co-
+ * pyright notices above, these terms and the disclaimer are retained
+ * in all redistributions or reproduced in accompanying documentation
+ * or other materials provided with binary redistributions.
+ *
+ * Licensor offers the work "AS IS" and WITHOUT WARRANTY of any kind,
+ * express, or implied, to the maximum extent permitted by applicable
+ * law, without malicious intent or gross negligence; in no event may
+ * licensor, an author or contributor be held liable for any indirect
+ * or other damage, or direct damage except proven a consequence of a
+ * direct error of said person and intended use of this work, loss or
+ * other issues arising in any way out of its use, even if advised of
+ * the possibility of such damage or existence of a defect.
+ */
+
+#include <sys/param.h>
+#include <err.h>
+#ifdef DEBUG
+#include <stdio.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "defs.h"
+#include "adler.h"
+#include "compress.h"
+#include "pack.h"
+#include "sysdeps.h"
+
+__RCSID("$MirOS: contrib/hosted/fwcf/unwraps.c,v 1.10 2006/09/26 10:25:03 tg Exp $");
+
+char *
+fwcf_unpack(int fd, size_t *inner)
+{
+	uint8_t c, hdrbuf[12];
+	size_t outer, x_inner, x, len, maxln;
+	char *cdata, *udata;
+	ADLER_DECL;
+
+	if (inner == NULL)
+		inner = &x_inner;
+
+	if (read(fd, hdrbuf, 12) != 12)
+		err(1, "read");
+
+	if (strncmp((const char *)hdrbuf, "FWCF", 4))
+		errx(1, "file format error");
+
+	outer = LOADT(hdrbuf + 4);
+	/* we don't need to support older versions, but specification
+	   major 0 and 1 are compatible */
+	if (hdrbuf[7] > FWCF_VER)
+		errx(1, "wrong file version %02Xh", hdrbuf[7]);
+	*inner = LOADT(hdrbuf + 8);
+	c = hdrbuf[11];
+	maxln = ((outer + (DEF_FLASHBLOCK - 1)) / DEF_FLASHBLOCK)
+	    * DEF_FLASHBLOCK;
+
+	if (((cdata = malloc(maxln)) == NULL) ||
+	    ((udata = malloc(*inner)) == NULL))
+		err(1, "malloc");
+	memcpy(cdata, hdrbuf, 12);
+	if (read(fd, cdata + 12, maxln - 12) < (ssize_t)(outer - 12))
+		err(1, "read");
+
+	len = outer - 4;
+	ADLER_CALC(cdata);
+	if ((s1 != LOADW(cdata + outer - 4)) ||
+	    (s2 != LOADW(cdata + outer - 2)))
+		errx(1, "crc mismatch: %02X%02X%02X%02X != %04X%04X",
+		    (uint8_t)cdata[outer - 1], (uint8_t)cdata[outer - 2],
+		    (uint8_t)cdata[outer - 3], (uint8_t)cdata[outer - 4],
+		    s2, s1);
+
+	if ((x = compressor_get(c)->decompress(udata, *inner, cdata + 12,
+	    outer - 16)) != *inner)
+		errx(1, "size mismatch: decompressed %lu, want %lu", (u_long)x,
+		    (u_long)*inner);
+	push_rndata((uint8_t *)cdata + outer, maxln - outer);
+	free(cdata);
+#ifdef DEBUG
+	fprintf(stderr, "fwcf_unpack: decompressed outer %lu inner %lu\n",
+	    (u_long)outer, (u_long)*inner);
+#endif
+	return (udata);
+}