[PATCH] lib: fwts_dump_data: add function for simply dump raw data

[Ivan Hu]

BugLink: https://bugs.launchpad.net/fwts/+bug/2023351

The generic dump function could simply dump raw data without address and
readable ASCII printout.

instead dumping
    Vendor-specific data:
  0000: 12 23 34 45 56 67 78 89 9A AB BC CD DE EF FF 55 .#4EVgx........U
    Interface:
    Interface Type: 0x01
    Reserved: 0x00000000

It could add prefix for data alignment as well.

Signed-off-by: Ivan Hu <ivan.hu at canonical.com>
---
 src/lib/include/fwts_dump_data.h |  1 +
 src/lib/src/fwts_dump_data.c     | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/lib/include/fwts_dump_data.h b/src/lib/include/fwts_dump_data.h
index 3dea7e45..5e255754 100644
--- a/src/lib/include/fwts_dump_data.h
+++ b/src/lib/include/fwts_dump_data.h
@@ -23,5 +23,6 @@
 #include "fwts.h"
 
 void fwts_dump_raw_data(char *buffer, const size_t len, const uint8_t *data, const int where, const size_t bytes);
+void fwts_dump_raw_data_prefix(char *buffer, const size_t len, const uint8_t *data, const char *prefix, const size_t bytes);
 
 #endif
diff --git a/src/lib/src/fwts_dump_data.c b/src/lib/src/fwts_dump_data.c
index a56f3230..60287a9d 100644
--- a/src/lib/src/fwts_dump_data.c
+++ b/src/lib/src/fwts_dump_data.c
@@ -61,3 +61,29 @@ void fwts_dump_raw_data(
 		buffer[n++] = (data[i] < 32 || data[i] > 126) ? '.' : data[i];
 	buffer[n] = '\0';
 }
+
+/*
+ *  fwts_dump_raw_data_prefix()
+ *	simply print raw uint8 data of length `nbytes` into a buffer (length len)
+ *      as a hex dump. nbytes must be no more than 16 with prefix. The prefix could
+ *	be used as alighment.
+ */
+void fwts_dump_raw_data_prefix(
+	char *buffer,		/* buffer to contained formatted dump */
+	const size_t len,	/* Length of buffer */
+	const uint8_t *data,	/* Octects to dump */
+	const char *prefix,	/* Prefix string or for alignment */
+	const size_t nbytes)	/* Number of bytes to dump, max 16 */
+{
+        int i;
+	int n = 0;
+	int nbytes_max = nbytes > 16 ? 16 : nbytes;
+
+	n = snprintf(buffer, len, "%s", prefix);
+
+	/* Hex dump */
+        for (i = 0; i < nbytes_max; i++)
+                n += snprintf(buffer + n, len - n, "%2.2X ", data[i]);
+
+	buffer[n] = '\0';
+}
-- 
2.34.1