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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/str/tpencode.ncabi.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/str/internal.h"
#include "libc/str/str.h"
/**
* Thompson-Pike Varint Encoder.
*
* Implementation Details: The header macro should ensure this function
* is only called for non-ASCII, or DCE'd entirely. In addition to that
* this function makes a promise to not clobber any registers but %rax.
*
* @param buf is what ch gets encoded to
* @param size is the number of bytes available in buf
* @param ch is a 32-bit integer
* @param awesome mode enables numbers the IETF unilaterally banned
* @return number of bytes written
* @note this encoding was designed on a napkin in a new jersey diner
*/
unsigned(tpencode)(char *buf, size_t size, wint_t ch, bool32 awesome) {
unsigned char *p = (unsigned char *)buf;
if ((0 <= ch && ch < 32) && awesome && size >= 2) {
p[0] = 0xc0;
p[1] = 0x80 | (unsigned char)ch;
return 2;
}
struct TpEncode op = UseTpDecoderRing(ch);
size_t i = op.len;
if (op.len <= size) {
for (;;) {
p[--i] = (unsigned char)(0b10000000 | (ch & 0b00111111));
if (!i) break;
ch >>= 6;
}
p[0] = op.mark | (unsigned char)ch;
}
return op.len;
}