gzip: add a function to parse the header
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/common.h b/include/common.h
index 1896335..4b521e1 100644
--- a/include/common.h
+++ b/include/common.h
@@ -609,6 +609,7 @@
ulong ticks2usec (unsigned long ticks);
/* lib/gunzip.c */
+int gzip_parse_header(const unsigned char *src, unsigned long len);
int gunzip(void *, int, unsigned char *, unsigned long *);
int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
int stoponerr, int offset);
diff --git a/lib/gunzip.c b/lib/gunzip.c
index 832b306..adb86c7 100644
--- a/lib/gunzip.c
+++ b/lib/gunzip.c
@@ -42,7 +42,7 @@
free (addr);
}
-int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
+int gzip_parse_header(const unsigned char *src, unsigned long len)
{
int i, flags;
@@ -63,12 +63,21 @@
;
if ((flags & HEAD_CRC) != 0)
i += 2;
- if (i >= *lenp) {
+ if (i >= len) {
puts ("Error: gunzip out of data in header\n");
return (-1);
}
+ return i;
+}
- return zunzip(dst, dstlen, src, lenp, 1, i);
+int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
+{
+ int offset = gzip_parse_header(src, *lenp);
+
+ if (offset < 0)
+ return offset;
+
+ return zunzip(dst, dstlen, src, lenp, 1, offset);
}
#ifdef CONFIG_CMD_UNZIP