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51 lines
2.8 KiB
C
51 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/leb128.h"
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/**
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* Encodes signed integer to array.
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*
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* uleb64 INT64_MAX l: 10𝑐 3𝑛𝑠
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* zleb64 INT64_MAX l: 13𝑐 4𝑛𝑠
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* sleb64 INT64_MAX l: 16𝑐 5𝑛𝑠
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* uleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
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* zleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
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* sleb128 INT64_MAX l: 24𝑐 8𝑛𝑠
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* zleb64 INT64_MIN l: 13𝑐 4𝑛𝑠
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* sleb64 INT64_MIN l: 16𝑐 5𝑛𝑠
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* zleb128 INT64_MIN l: 19𝑐 6𝑛𝑠
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* sleb128 INT64_MIN l: 24𝑐 8𝑛𝑠
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*
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* @param p is output array
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* @param x is number
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* @return p + i
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*/
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char *sleb64(char *p, int64_t x) {
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int c;
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for (;;) {
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c = x & 127;
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x >>= 7;
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if ((x == 0 && !(c & 64)) || (x == -1 && (c & 64))) {
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*p++ = c;
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return p;
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} else {
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*p++ = c | 128;
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}
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}
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}
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