util: Add hex_decode_talloc() to decode hex string into a binary blob

Signed-off-by: Amitay Isaacs <amitay@gmail.com>

(This used to be ctdb commit 307416afda707b687f5e89e8438e45c154a4c806)

2 files changed, 17 insertions, 0 deletions

diff --git a/ctdb/include/includes.h b/ctdb/include/includes.h
index e0ce06b82a..37471982de 100644
--- a/ctdb/include/includes.h
+++ b/ctdb/include/includes.h
@@ -58,6 +58,7 @@ double timeval_elapsed(struct timeval *tv);
 double timeval_delta(struct timeval *tv2, struct timeval *tv);
 char **file_lines_load(const char *fname, int *numlines, TALLOC_CTX *mem_ctx);
 char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len);
+uint8_t *hex_decode_talloc(TALLOC_CTX *mem_ctx, const char *hex_in, size_t *len);
 _PUBLIC_ const char **str_list_add(const char **list, const char *s);
 _PUBLIC_ int set_blocking(int fd, bool set);
 
diff --git a/ctdb/lib/util/util_file.c b/ctdb/lib/util/util_file.c
index 21d64b20e3..3a90201cce 100644
--- a/ctdb/lib/util/util_file.c
+++ b/ctdb/lib/util/util_file.c
@@ -114,3 +114,19 @@ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_
 
 	return hex_buffer;
 }
+
+uint8_t *hex_decode_talloc(TALLOC_CTX *mem_ctx, const char *hex_in, size_t *len)
+{
+	int i, num;
+	uint8_t *buffer;
+
+	*len = strlen(hex_in) / 2;
+	buffer = talloc_array(mem_ctx, unsigned char, *len);
+
+	for (i=0; i<*len; i++) {
+		sscanf(&hex_in[i*2], "%02X", &num);
+		buffer[i] = (uint8_t)num;
+	}
+
+	return buffer;
+}