diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/gunzip.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/lib/gunzip.c b/lib/gunzip.c index 832b3064e76..adb86c75503 100644 --- a/lib/gunzip.c +++ b/lib/gunzip.c @@ -42,7 +42,7 @@ void gzfree(void *x, void *addr, unsigned nb) 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 @@ int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp) ; 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; +} + +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, i); + return zunzip(dst, dstlen, src, lenp, 1, offset); } #ifdef CONFIG_CMD_UNZIP |