diff options
| -rw-r--r-- | include/common.h | 1 | ||||
| -rw-r--r-- | lib/gunzip.c | 15 |
2 files changed, 13 insertions, 3 deletions
diff --git a/include/common.h b/include/common.h index 1896335584..4b521e142a 100644 --- a/include/common.h +++ b/include/common.h @@ -609,6 +609,7 @@ ulong usec2ticks (unsigned long usec); 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 832b3064e7..adb86c7550 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 |