52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include "chat.h"
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// Adapted from <https://github.com/cbreeden/fxhash/blob/master/lib.rs>.
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static uint32_t hashChar(uint32_t hash, char ch) {
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hash = (hash << 5) | (hash >> 27);
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hash ^= ch;
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hash *= 0x27220A95;
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return hash;
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}
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enum IRCColor colorGen(const char *str) {
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if (!str) return IRCDefault;
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uint32_t hash = 0;
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if (*str == '~') str++;
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for (; *str; ++str) {
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hash = hashChar(hash, *str);
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}
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while (IRCBlack == (hash & IRCLightGray)) {
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hash = hashChar(hash, '\0');
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}
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return (hash & IRCLightGray);
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}
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static enum IRCColor colors[TagsLen];
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struct Tag colorTag(struct Tag tag, const char *gen) {
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if (!colors[tag.id]) colors[tag.id] = 1 + colorGen(gen);
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return tag;
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}
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enum IRCColor colorFor(struct Tag tag) {
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return colors[tag.id] ? colors[tag.id] - 1 : IRCDefault;
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}
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