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From 1dcebf6f57e3490f7b3e2464b4114b993dd70c7c Mon Sep 17 00:00:00 2001
From: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Date: Thu, 4 Aug 2022 16:46:47 +0100
Subject: [PATCH 02/42] lib: uuid: introduce uuid_str_to_le_bin function
convert UUID string to little endian binary data
Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Jens Wiklander <jens.wiklander@linaro.org>
Upstream-Status: Submitted [cover letter: https://lore.kernel.org/all/20221122131751.22747-1-abdellatif.elkhlifi@arm.com/]
Changelog:
===============
v8:
* use simple_strtoull() in uuid_str_to_le_bin() to support 32-bit platforms
v7:
* rename be_uuid_str_to_le_bin() to uuid_str_to_le_bin()
* make uuid_str_to_le_bin() implementation similar to uuid_str_to_bin()
by using same APIs
v4:
* rename ffa_uuid_str_to_bin to be_uuid_str_to_le_bin and put in
a standalone commit (the current)
v3:
* introduce ffa_uuid_str_to_bin (provided by
arm_ffa: introduce Arm FF-A low-level driver)
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
---
include/uuid.h | 8 ++++++++
lib/uuid.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
diff --git a/include/uuid.h b/include/uuid.h
index 4a4883d3b5..293a8eb0a5 100644
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -2,6 +2,8 @@
/*
* Copyright (C) 2014 Samsung Electronics
* Przemyslaw Marczak <p.marczak@samsung.com>
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
*/
#ifndef __UUID_H__
#define __UUID_H__
@@ -44,4 +46,10 @@ int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
const char *uuid_guid_get_str(const unsigned char *guid_bin);
void gen_rand_uuid(unsigned char *uuid_bin);
void gen_rand_uuid_str(char *uuid_str, int str_format);
+
+/**
+ * uuid_str_to_le_bin - Converts a UUID string to little endian binary data
+ */
+int uuid_str_to_le_bin(const char *uuid_str, unsigned char *uuid_bin);
+
#endif
diff --git a/lib/uuid.c b/lib/uuid.c
index 465e1ac38f..d29f561a70 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -1,6 +1,8 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2011 Calxeda, Inc.
+ * (C) Copyright 2022 ARM Limited
+ * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
*/
#include <common.h>
@@ -346,6 +348,50 @@ int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
return 0;
}
+/**
+ * uuid_str_to_le_bin() - Convert string UUID to little endian binary data.
+ * @uuid_str: pointer to UUID string
+ * @uuid_bin: pointer to allocated array for little endian output [16B]
+ *
+ * UUID string is 36 characters (36 bytes):
+ *
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+ *
+ * where x is a hexadecimal character. Fields are separated by '-'s.
+ * When converting to a little endian binary UUID, the string fields are reversed.
+ *
+ * Return:
+ *
+ * uuid_bin filled with little endian UUID data
+ * On success 0 is returned. Otherwise, failure code.
+ */
+int uuid_str_to_le_bin(const char *uuid_str, unsigned char *uuid_bin)
+{
+ u16 tmp16;
+ u32 tmp32;
+ u64 tmp64;
+
+ if (!uuid_str_valid(uuid_str) || !uuid_bin)
+ return -EINVAL;
+
+ tmp32 = cpu_to_le32(hextoul(uuid_str, NULL));
+ memcpy(uuid_bin, &tmp32, 4);
+
+ tmp16 = cpu_to_le16(hextoul(uuid_str + 9, NULL));
+ memcpy(uuid_bin + 4, &tmp16, 2);
+
+ tmp16 = cpu_to_le16(hextoul(uuid_str + 14, NULL));
+ memcpy(uuid_bin + 6, &tmp16, 2);
+
+ tmp16 = cpu_to_le16(hextoul(uuid_str + 19, NULL));
+ memcpy(uuid_bin + 8, &tmp16, 2);
+
+ tmp64 = cpu_to_le64(simple_strtoull(uuid_str + 24, NULL, 16));
+ memcpy(uuid_bin + 10, &tmp64, 6);
+
+ return 0;
+}
+
/*
* uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
*
--
2.25.1
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