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helper: Make unhexify() robust on invalid data

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The current implementation is not suitable for user provided data
because it does not detect invalid inputs in many cases. For example,
the string "aa0xbb" is successfully converted to the 3 bytes: 0xaa,
0x00 and 0xbb. An other example is "aabi" which is successfully
converted to the 2 bytes: 0xaa and 0x0b. Both are obviously incorrect.

Make unhexify() robust on invalid data and use more appropriate data
types for its parameters. Also, add a small documentation for the
function.

Change-Id: Idb799beb86fc608b066c8a76365021ed44c7f890
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/3792
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Marc Schink
2016-05-22 19:44:27 +02:00
committed by Andreas Fritiofson
parent 10aeff9259
commit 674141e8a7
5 changed files with 39 additions and 14 deletions
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2
src/helper/binarybuffer.h
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@@ -234,7 +234,7 @@ void bit_copy_discard(struct bit_copy_queue *q);
/* functions to convert to/from hex encoded buffer
* used in ti-icdi driver and gdb server */
int unhexify(char *bin, const char *hex, int count);
size_t unhexify(uint8_t *bin, const char *hex, size_t count);
int hexify(char *hex, const char *bin, int count, int out_maxlen);
void buffer_shr(void *_buf, unsigned buf_len, unsigned count);