1 d5af38cc 2022-01-10 op /*
  2 d5af38cc 2022-01-10 op  * Copyright (c) 2022 Omar Polo <op@omarpolo.com>
  3 d5af38cc 2022-01-10 op  *
  4 d5af38cc 2022-01-10 op  * Permission to use, copy, modify, and distribute this software for any
  5 d5af38cc 2022-01-10 op  * purpose with or without fee is hereby granted, provided that the above
  6 d5af38cc 2022-01-10 op  * copyright notice and this permission notice appear in all copies.
  7 d5af38cc 2022-01-10 op  *
  8 d5af38cc 2022-01-10 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 d5af38cc 2022-01-10 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 d5af38cc 2022-01-10 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 d5af38cc 2022-01-10 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 d5af38cc 2022-01-10 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 d5af38cc 2022-01-10 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 d5af38cc 2022-01-10 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 d5af38cc 2022-01-10 op  */
 16 d5af38cc 2022-01-10 op 
 17 d5af38cc 2022-01-10 op #include "compat.h"
 18 d5af38cc 2022-01-10 op 
 19 d5af38cc 2022-01-10 op #include <stdlib.h>
 20 d5af38cc 2022-01-10 op #include <stdint.h>
 21 d5af38cc 2022-01-10 op #include <string.h>
 22 d5af38cc 2022-01-10 op 
 23 d5af38cc 2022-01-10 op #include "telescope.h"
 24 d5af38cc 2022-01-10 op #include "mcache.h"
 25 8f3c9af8 2022-01-11 op #include "parser.h"
 26 9d65b1d9 2022-01-11 op #include "utils.h"
 27 d5af38cc 2022-01-10 op 
 28 d5af38cc 2022-01-10 op const char *gemtext_prefixes[] = {
 29 d5af38cc 2022-01-10 op 	[LINE_TEXT] = "",
 30 d5af38cc 2022-01-10 op 	[LINE_TITLE_1] = "# ",
 31 d5af38cc 2022-01-10 op 	[LINE_TITLE_2] = "## ",
 32 d5af38cc 2022-01-10 op 	[LINE_TITLE_3] = "### ",
 33 d5af38cc 2022-01-10 op 	[LINE_ITEM] = "* ",
 34 d5af38cc 2022-01-10 op 	[LINE_QUOTE] = "> ",
 35 d5af38cc 2022-01-10 op 	[LINE_PRE_START] = "``` ",
 36 d5af38cc 2022-01-10 op 	[LINE_PRE_CONTENT] = "",
 37 d5af38cc 2022-01-10 op 	[LINE_PRE_END] = "```",
 38 d5af38cc 2022-01-10 op };
 39 d5af38cc 2022-01-10 op 
 40 d5af38cc 2022-01-10 op struct mcache {
 41 d5af38cc 2022-01-10 op 	struct ohash	h;
 42 d5af38cc 2022-01-10 op 	size_t		tot;
 43 d5af38cc 2022-01-10 op } mcache;
 44 d5af38cc 2022-01-10 op 
 45 d5af38cc 2022-01-10 op struct mcache_entry {
 46 4e3871f5 2022-01-11 op 	const char	*parser_name;
 47 d5af38cc 2022-01-10 op 	int		 trust;
 48 d5af38cc 2022-01-10 op 	struct evbuffer	*evb;
 49 d5af38cc 2022-01-10 op 	char		 url[];
 50 d5af38cc 2022-01-10 op };
 51 d5af38cc 2022-01-10 op 
 52 ffcd827c 2022-01-11 op static void
 53 ffcd827c 2022-01-11 op mcache_free_entry(const char *url)
 54 ffcd827c 2022-01-11 op {
 55 ffcd827c 2022-01-11 op 	struct mcache_entry	*e;
 56 ffcd827c 2022-01-11 op 	unsigned int		 slot;
 57 ffcd827c 2022-01-11 op 
 58 ffcd827c 2022-01-11 op 	slot = ohash_qlookup(&mcache.h, url);
 59 ffcd827c 2022-01-11 op 	if ((e = ohash_remove(&mcache.h, slot)) == NULL)
 60 ffcd827c 2022-01-11 op 		return;
 61 ffcd827c 2022-01-11 op 
 62 ffcd827c 2022-01-11 op 	evbuffer_free(e->evb);
 63 ffcd827c 2022-01-11 op 	free(e);
 64 ffcd827c 2022-01-11 op }
 65 ffcd827c 2022-01-11 op 
 66 d5af38cc 2022-01-10 op void
 67 d5af38cc 2022-01-10 op mcache_init(void)
 68 d5af38cc 2022-01-10 op {
 69 d5af38cc 2022-01-10 op 	struct ohash_info info = {
 70 d5af38cc 2022-01-10 op 		.key_offset = offsetof(struct mcache_entry, url),
 71 d5af38cc 2022-01-10 op 		.calloc = hash_calloc,
 72 d5af38cc 2022-01-10 op 		.free = hash_free,
 73 d5af38cc 2022-01-10 op 		.alloc = hash_alloc,
 74 d5af38cc 2022-01-10 op 	};
 75 d5af38cc 2022-01-10 op 
 76 d5af38cc 2022-01-10 op 	ohash_init(&mcache.h, 5, &info);
 77 d5af38cc 2022-01-10 op }
 78 d5af38cc 2022-01-10 op 
 79 d5af38cc 2022-01-10 op int
 80 8f3c9af8 2022-01-11 op mcache_tab(struct tab *tab)
 81 d5af38cc 2022-01-10 op {
 82 d5af38cc 2022-01-10 op 	struct mcache_entry	*e;
 83 d5af38cc 2022-01-10 op 	struct line		*line;
 84 d5af38cc 2022-01-10 op 	unsigned int		 slot;
 85 d5af38cc 2022-01-10 op 	size_t			 l, len;
 86 8f3c9af8 2022-01-11 op 	const char		*url;
 87 d5af38cc 2022-01-10 op 
 88 8f3c9af8 2022-01-11 op 	url = tab->hist_cur->h;
 89 d5af38cc 2022-01-10 op 	l = strlen(url);
 90 d5af38cc 2022-01-10 op 	len = sizeof(*e) + l + 1;
 91 d5af38cc 2022-01-10 op 
 92 d5af38cc 2022-01-10 op 	if ((e = calloc(1, len)) == NULL)
 93 d5af38cc 2022-01-10 op 		return -1;
 94 4e3871f5 2022-01-11 op 	e->parser_name = tab->buffer.page.name;
 95 8f3c9af8 2022-01-11 op 	e->trust = tab->trust;
 96 d5af38cc 2022-01-10 op 	memcpy(e->url, url, l);
 97 d5af38cc 2022-01-10 op 
 98 d5af38cc 2022-01-10 op 	if ((e->evb = evbuffer_new()) == NULL)
 99 d5af38cc 2022-01-10 op 		goto err;
100 d5af38cc 2022-01-10 op 
101 8f3c9af8 2022-01-11 op 	TAILQ_FOREACH(line, &tab->buffer.page.head, lines) {
102 d5af38cc 2022-01-10 op 		const char	*text, *alt;
103 d5af38cc 2022-01-10 op 		int		 r;
104 d5af38cc 2022-01-10 op 
105 d5af38cc 2022-01-10 op 		if ((text = line->line) == NULL)
106 d5af38cc 2022-01-10 op 			text = "";
107 d5af38cc 2022-01-10 op 
108 d5af38cc 2022-01-10 op 		if ((alt = line->alt) == NULL)
109 d5af38cc 2022-01-10 op 			alt = "";
110 d5af38cc 2022-01-10 op 
111 d5af38cc 2022-01-10 op 		switch (line->type) {
112 d5af38cc 2022-01-10 op 		case LINE_TEXT:
113 d5af38cc 2022-01-10 op 		case LINE_TITLE_1:
114 d5af38cc 2022-01-10 op 		case LINE_TITLE_2:
115 d5af38cc 2022-01-10 op 		case LINE_TITLE_3:
116 d5af38cc 2022-01-10 op 		case LINE_ITEM:
117 d5af38cc 2022-01-10 op 		case LINE_QUOTE:
118 d5af38cc 2022-01-10 op 		case LINE_PRE_START:
119 d5af38cc 2022-01-10 op 		case LINE_PRE_CONTENT:
120 d5af38cc 2022-01-10 op 		case LINE_PRE_END:
121 d5af38cc 2022-01-10 op 			r = evbuffer_add_printf(e->evb, "%s%s\n",
122 d5af38cc 2022-01-10 op 			    gemtext_prefixes[line->type], text);
123 d5af38cc 2022-01-10 op 			break;
124 d5af38cc 2022-01-10 op 
125 d5af38cc 2022-01-10 op 		case LINE_LINK:
126 d5af38cc 2022-01-10 op 			r = evbuffer_add_printf(e->evb, "=> %s %s\n",
127 d5af38cc 2022-01-10 op 			    alt, text);
128 d5af38cc 2022-01-10 op 			break;
129 d5af38cc 2022-01-10 op 
130 d5af38cc 2022-01-10 op 		case LINE_PATCH:
131 d5af38cc 2022-01-10 op 		case LINE_PATCH_HDR:
132 d5af38cc 2022-01-10 op 		case LINE_PATCH_HUNK_HDR:
133 d5af38cc 2022-01-10 op 		case LINE_PATCH_ADD:
134 d5af38cc 2022-01-10 op 		case LINE_PATCH_DEL:
135 d5af38cc 2022-01-10 op 			/* TODO */
136 d5af38cc 2022-01-10 op 			r = -1;
137 d5af38cc 2022-01-10 op 			break;
138 d5af38cc 2022-01-10 op 
139 d5af38cc 2022-01-10 op 		case LINE_COMPL:
140 d5af38cc 2022-01-10 op 		case LINE_COMPL_CURRENT:
141 d5af38cc 2022-01-10 op 		case LINE_HELP:
142 d5af38cc 2022-01-10 op 		case LINE_DOWNLOAD:
143 d5af38cc 2022-01-10 op 		case LINE_DOWNLOAD_DONE:
144 d5af38cc 2022-01-10 op 		case LINE_DOWNLOAD_INFO:
145 d5af38cc 2022-01-10 op 		case LINE_FRINGE:
146 d5af38cc 2022-01-10 op 			/* not reached */
147 d5af38cc 2022-01-10 op 			abort();
148 d5af38cc 2022-01-10 op 		}
149 d5af38cc 2022-01-10 op 
150 d5af38cc 2022-01-10 op 		if (r == -1)
151 d5af38cc 2022-01-10 op 			goto err;
152 d5af38cc 2022-01-10 op 	}
153 d5af38cc 2022-01-10 op 
154 ffcd827c 2022-01-11 op 	/* free any previously cached copies of this page */
155 ffcd827c 2022-01-11 op 	mcache_free_entry(url);
156 ffcd827c 2022-01-11 op 
157 d5af38cc 2022-01-10 op 	slot = ohash_qlookup(&mcache.h, url);
158 d5af38cc 2022-01-10 op 	ohash_insert(&mcache.h, slot, e);
159 d5af38cc 2022-01-10 op 	return 0;
160 d5af38cc 2022-01-10 op 
161 d5af38cc 2022-01-10 op err:
162 d5af38cc 2022-01-10 op 	if (e->evb != NULL)
163 d5af38cc 2022-01-10 op 		evbuffer_free(e->evb);
164 d5af38cc 2022-01-10 op 	free(e);
165 d5af38cc 2022-01-10 op 	return -1;
166 d5af38cc 2022-01-10 op }
167 d5af38cc 2022-01-10 op 
168 d5af38cc 2022-01-10 op int
169 8f3c9af8 2022-01-11 op mcache_lookup(const char *url, struct tab *tab)
170 d5af38cc 2022-01-10 op {
171 d5af38cc 2022-01-10 op 	struct mcache_entry	*e;
172 d5af38cc 2022-01-10 op 	unsigned int		 slot;
173 d5af38cc 2022-01-10 op 
174 d5af38cc 2022-01-10 op 	slot = ohash_qlookup(&mcache.h, url);
175 d5af38cc 2022-01-10 op 	if ((e = ohash_find(&mcache.h, slot)) == NULL)
176 d5af38cc 2022-01-10 op 		return 0;
177 d5af38cc 2022-01-10 op 
178 8f3c9af8 2022-01-11 op 	parser_init(tab, gemtext_initparser);
179 8f3c9af8 2022-01-11 op 	if (!parser_parse(tab, EVBUFFER_DATA(e->evb), EVBUFFER_LENGTH(e->evb)))
180 8f3c9af8 2022-01-11 op 		goto err;
181 8f3c9af8 2022-01-11 op 	if (!parser_free(tab))
182 8f3c9af8 2022-01-11 op 		goto err;
183 8f3c9af8 2022-01-11 op 
184 4e3871f5 2022-01-11 op 	tab->buffer.page.name = e->parser_name;
185 8f3c9af8 2022-01-11 op 	tab->trust = e->trust;
186 d5af38cc 2022-01-10 op 	return 1;
187 8f3c9af8 2022-01-11 op 
188 8f3c9af8 2022-01-11 op err:
189 8f3c9af8 2022-01-11 op 	parser_free(tab);
190 8f3c9af8 2022-01-11 op 	erase_buffer(&tab->buffer);
191 8f3c9af8 2022-01-11 op 	return 0;
192 d5af38cc 2022-01-10 op }