linux-kernel - [PATCH 2/3] include/linux/ascii85: Add ascii85_encode_to

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Message-Id: <1541484606-20813-2-git-send-email-smasetty@codeaurora.org>
Date:   Tue,  6 Nov 2018 11:40:05 +0530
From:   Sharat Masetty <smasetty@...eaurora.org>
To:     freedreno@...ts.freedesktop.org
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        chris@...is-wilson.co.uk, jcrouse@...eaurora.org,
        robdclark@...il.com, linux-kernel@...r.kernel.org,
        Sharat Masetty <smasetty@...eaurora.org>
Subject: [PATCH 2/3] include/linux/ascii85: Add ascii85_encode_to_buf()

Add a new function which, in addition to ascii85 encoding to buffer
also returns the length of the encoded string. The length return enables
iteration over the output buffer space. This helps with efficient encoding
of larger buffers, since we avoid an additional memcpy/scnprintf.

Signed-off-by: Sharat Masetty <smasetty@...eaurora.org>
---
 include/linux/ascii85.h | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/include/linux/ascii85.h b/include/linux/ascii85.h
index 4cc4020..3665899 100644
--- a/include/linux/ascii85.h
+++ b/include/linux/ascii85.h
@@ -23,8 +23,12 @@
 {
 	int i;
 
-	if (in == 0)
-		return "z";
+	if (in == 0) {
+		out[0] = 'z';
+		out[1] = '\0';
+
+		return out;
+	}
 
 	out[5] = '\0';
 	for (i = 5; i--; ) {
@@ -35,4 +39,15 @@
 	return out;
 }
 
+static inline size_t
+ascii85_encode_to_buf(u32 in, char *out)
+{
+	ascii85_encode(in, out);
+
+	if (in == 0)
+		return 1;
+
+	return 5;
+}
+
 #endif
-- 
1.9.1