1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009 The FreeBSD Foundation 5 * 6 * This software was developed by Ed Schouten under sponsorship from the 7 * FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #include <sys/refcount.h> 36 #include <sys/systm.h> 37 38 #include <dev/vt/vt.h> 39 40 static MALLOC_DEFINE(M_VTFONT, "vtfont", "vt font"); 41 42 /* Some limits to prevent abnormal fonts from being loaded. */ 43 #define VTFONT_MAXMAPPINGS 65536 44 #define VTFONT_MAXGLYPHS 131072 45 #define VTFONT_MAXGLYPHSIZE 2097152 46 #define VTFONT_MAXDIMENSION 128 47 48 static uint16_t 49 vtfont_bisearch(const vfnt_map_t *map, unsigned int len, uint32_t src) 50 { 51 int min, mid, max; 52 53 min = 0; 54 max = len - 1; 55 56 /* Empty font map. */ 57 if (len == 0) 58 return (0); 59 /* Character below minimal entry. */ 60 if (src < map[0].vfm_src) 61 return (0); 62 /* Optimization: ASCII characters occur very often. */ 63 if (src <= map[0].vfm_src + map[0].vfm_len) 64 return (src - map[0].vfm_src + map[0].vfm_dst); 65 /* Character above maximum entry. */ 66 if (src > map[max].vfm_src + map[max].vfm_len) 67 return (0); 68 69 /* Binary search. */ 70 while (max >= min) { 71 mid = (min + max) / 2; 72 if (src < map[mid].vfm_src) 73 max = mid - 1; 74 else if (src > map[mid].vfm_src + map[mid].vfm_len) 75 min = mid + 1; 76 else 77 return (src - map[mid].vfm_src + map[mid].vfm_dst); 78 } 79 80 return (0); 81 } 82 83 const uint8_t * 84 vtfont_lookup(const struct vt_font *vf, term_char_t c) 85 { 86 uint32_t src; 87 uint16_t dst; 88 size_t stride; 89 unsigned int normal_map; 90 unsigned int bold_map; 91 92 src = TCHAR_CHARACTER(c); 93 if (TCHAR_FORMAT(c) & TF_CJK_RIGHT) { 94 normal_map = VFNT_MAP_NORMAL_RIGHT; 95 bold_map = VFNT_MAP_BOLD_RIGHT; 96 } else { 97 normal_map = VFNT_MAP_NORMAL; 98 bold_map = VFNT_MAP_BOLD; 99 } 100 101 if (TCHAR_FORMAT(c) & TF_BOLD) { 102 dst = vtfont_bisearch(vf->vf_map[bold_map], 103 vf->vf_map_count[bold_map], src); 104 if (dst != 0) 105 goto found; 106 } 107 dst = vtfont_bisearch(vf->vf_map[normal_map], 108 vf->vf_map_count[normal_map], src); 109 110 found: 111 stride = howmany(vf->vf_width, 8) * vf->vf_height; 112 return (&vf->vf_bytes[dst * stride]); 113 } 114 115 struct vt_font * 116 vtfont_ref(struct vt_font *vf) 117 { 118 119 refcount_acquire(&vf->vf_refcount); 120 return (vf); 121 } 122 123 void 124 vtfont_unref(struct vt_font *vf) 125 { 126 unsigned int i; 127 128 if (refcount_release(&vf->vf_refcount)) { 129 for (i = 0; i < VFNT_MAPS; i++) 130 free(vf->vf_map[i], M_VTFONT); 131 free(vf->vf_bytes, M_VTFONT); 132 free(vf, M_VTFONT); 133 } 134 } 135 136 static int 137 vtfont_validate_map(vfnt_map_t *vfm, unsigned int length, 138 unsigned int glyph_count) 139 { 140 unsigned int i, last = 0; 141 142 for (i = 0; i < length; i++) { 143 /* Not ordered. */ 144 if (i > 0 && vfm[i].vfm_src <= last) 145 return (EINVAL); 146 /* 147 * Destination extends amount of glyphs. 148 */ 149 if (vfm[i].vfm_dst >= glyph_count || 150 vfm[i].vfm_dst + vfm[i].vfm_len >= glyph_count) 151 return (EINVAL); 152 last = vfm[i].vfm_src + vfm[i].vfm_len; 153 } 154 155 return (0); 156 } 157 158 int 159 vtfont_load(vfnt_t *f, struct vt_font **ret) 160 { 161 size_t glyphsize, mapsize; 162 struct vt_font *vf; 163 int error; 164 unsigned int i; 165 166 /* Make sure the dimensions are valid. */ 167 if (f->width < 1 || f->height < 1) 168 return (EINVAL); 169 if (f->width > VTFONT_MAXDIMENSION || f->height > VTFONT_MAXDIMENSION || 170 f->glyph_count > VTFONT_MAXGLYPHS) 171 return (E2BIG); 172 173 /* Not too many mappings. */ 174 for (i = 0; i < VFNT_MAPS; i++) 175 if (f->map_count[i] > VTFONT_MAXMAPPINGS) 176 return (E2BIG); 177 178 /* Character 0 must always be present. */ 179 if (f->glyph_count < 1) 180 return (EINVAL); 181 182 glyphsize = howmany(f->width, 8) * f->height * f->glyph_count; 183 if (glyphsize > VTFONT_MAXGLYPHSIZE) 184 return (E2BIG); 185 186 /* Allocate new font structure. */ 187 vf = malloc(sizeof *vf, M_VTFONT, M_WAITOK | M_ZERO); 188 vf->vf_bytes = malloc(glyphsize, M_VTFONT, M_WAITOK); 189 vf->vf_height = f->height; 190 vf->vf_width = f->width; 191 vf->vf_refcount = 1; 192 193 /* Allocate, copy in, and validate mappings. */ 194 for (i = 0; i < VFNT_MAPS; i++) { 195 vf->vf_map_count[i] = f->map_count[i]; 196 if (f->map_count[i] == 0) 197 continue; 198 mapsize = f->map_count[i] * sizeof(vfnt_map_t); 199 vf->vf_map[i] = malloc(mapsize, M_VTFONT, M_WAITOK); 200 error = copyin(f->map[i], vf->vf_map[i], mapsize); 201 if (error) 202 goto bad; 203 error = vtfont_validate_map(vf->vf_map[i], vf->vf_map_count[i], 204 f->glyph_count); 205 if (error) 206 goto bad; 207 } 208 209 /* Copy in glyph data. */ 210 error = copyin(f->glyphs, vf->vf_bytes, glyphsize); 211 if (error) 212 goto bad; 213 214 /* Success. */ 215 *ret = vf; 216 return (0); 217 218 bad: vtfont_unref(vf); 219 return (error); 220 } 221