mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2026-02-09 10:06:25 -05:00
f055cf398d
Things are structured in a way allowing testing falling back to implicitly assumed device by defining/not defining macros.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* PipeWire */
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/* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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static inline void base64_encode(const uint8_t *data, size_t len, char *enc, char pad)
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{
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static const char tab[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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size_t i;
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for (i = 0; i < len; i += 3) {
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uint32_t v;
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v = data[i+0] << 16;
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v |= (i+1 < len ? data[i+1] : 0) << 8;
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v |= (i+2 < len ? data[i+2] : 0);
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*enc++ = tab[(v >> (3*6)) & 0x3f];
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*enc++ = tab[(v >> (2*6)) & 0x3f];
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*enc++ = i+1 < len ? tab[(v >> (1*6)) & 0x3f] : pad;
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*enc++ = i+2 < len ? tab[(v >> (0*6)) & 0x3f] : pad;
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}
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*enc = '\0';
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}
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static inline size_t base64_decode(const char *data, size_t len, uint8_t *dec)
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{
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uint8_t tab[] = {
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62, -1, -1, -1, 63, 52, 53, 54, 55, 56,
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57, 58, 59, 60, 61, -1, -1, -1, -1, -1,
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-1, -1, 0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
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18, 19, 20, 21, 22, 23, 24, 25, -1, -1,
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-1, -1, -1, -1, 26, 27, 28, 29, 30, 31,
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32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
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42, 43, 44, 45, 46, 47, 48, 49, 50, 51 };
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size_t i, j;
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for (i = 0, j = 0; i < len; i += 4) {
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uint32_t v;
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v = tab[data[i+0]-43] << (3*6);
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v |= tab[data[i+1]-43] << (2*6);
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v |= (data[i+2] == '=' ? 0 : tab[data[i+2]-43]) << (1*6);
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v |= (data[i+3] == '=' ? 0 : tab[data[i+3]-43]);
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dec[j++] = (v >> 16) & 0xff;
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if (data[i+2] != '=') dec[j++] = (v >> 8) & 0xff;
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if (data[i+3] != '=') dec[j++] = v & 0xff;
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}
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return j;
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}
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