forked from mirrors/linux
489cae632f
The i915 DRM driver very cleverly used ascii85 encoding for their GPU state file. Move the encode functions to a general header file to support other drivers that might be interested in the same functionality. v4: Make the return value const char * as suggested by Chris Wilson v3: Fix error_puts -> err_puts pointed out by the 01.org bot v2: Update API to be cleaner for the caller as suggested by Chris Wilson Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>
38 lines
532 B
C
38 lines
532 B
C
/*
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* Copyright (c) 2008 Intel Corporation
|
|
* Copyright (c) 2018 The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#ifndef _ASCII85_H_
|
|
#define _ASCII85_H_
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#define ASCII85_BUFSZ 6
|
|
|
|
static inline long
|
|
ascii85_encode_len(long len)
|
|
{
|
|
return DIV_ROUND_UP(len, 4);
|
|
}
|
|
|
|
static inline const char *
|
|
ascii85_encode(u32 in, char *out)
|
|
{
|
|
int i;
|
|
|
|
if (in == 0)
|
|
return "z";
|
|
|
|
out[5] = '\0';
|
|
for (i = 5; i--; ) {
|
|
out[i] = '!' + in % 85;
|
|
in /= 85;
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
#endif
|