| 1 | /* |
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| 2 | * SPDX-License-Identifier: GPL-2.0 |
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| 3 | * |
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| 4 | * Copyright (c) 2008 Intel Corporation |
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| 5 | * Copyright (c) 2018 The Linux Foundation. All rights reserved. |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef _ASCII85_H_ |
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| 9 | #define _ASCII85_H_ |
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| 10 | |
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| 11 | #include <linux/math.h> |
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| 12 | #include <linux/types.h> |
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| 13 | |
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| 14 | #define ASCII85_BUFSZ 6 |
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| 15 | |
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| 16 | static inline long |
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| 17 | ascii85_encode_len(long len) |
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| 18 | { |
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| 19 | return DIV_ROUND_UP(len, 4); |
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| 20 | } |
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| 21 | |
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| 22 | static inline const char * |
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| 23 | ascii85_encode(u32 in, char *out) |
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| 24 | { |
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| 25 | int i; |
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| 26 | |
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| 27 | if (in == 0) |
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| 28 | return "z" ; |
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| 29 | |
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| 30 | out[5] = '\0'; |
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| 31 | for (i = 5; i--; ) { |
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| 32 | out[i] = '!' + in % 85; |
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| 33 | in /= 85; |
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| 34 | } |
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| 35 | |
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| 36 | return out; |
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| 37 | } |
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| 38 | |
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| 39 | #endif |
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| 40 | |
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