linux-kernel - [PATCH v1.1 1/4] lib: hex2bin converts ascii hexadecimal string to binary

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Message-Id: <1286827903-3066-2-git-send-email-zohar@linux.vnet.ibm.com>
Date:	Mon, 11 Oct 2010 16:11:40 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-crypto@...r.kernel.org, David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH v1.1 1/4] lib: hex2bin converts ascii hexadecimal string to binary

Similar to the kgdb_hex2mem() code, hex2bin converts a string
to binary using the hex_to_bin() library call.

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
---
 include/linux/kernel.h |    1 +
 lib/hexdump.c          |   16 ++++++++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2b0a35e..69ddea8 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -396,6 +396,7 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
 }
 
 extern int hex_to_bin(char ch);
+extern void hex2bin(unsigned char *mem, char *buf, int count);
 
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 5d7a480..66f96bb 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -34,6 +34,22 @@ int hex_to_bin(char ch)
 EXPORT_SYMBOL(hex_to_bin);
 
 /**
+ * hex2bin - convert an ascii hexadecimal string to its binary representation
+ * @mem: result
+ * @buf: ascii hexadecimal string
+ * @count: result length
+ */
+void hex2bin(unsigned char *mem, char *buf, int count)
+{
+	while (count--) {
+		*mem = hex_to_bin(*buf++) << 4;
+		*mem += hex_to_bin(*buf++);
+		mem++;
+	}
+}
+EXPORT_SYMBOL(hex2bin);
+
+/**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
-- 
1.7.2.2

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