1 /*- 2 * Copyright (c) 2009 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Ed Schouten under sponsorship from the 6 * FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/refcount.h> 37 #include <sys/systm.h> 38 39 #include <dev/vt/vt.h> 40 41 static MALLOC_DEFINE(M_VTFONT, "vtfont", "vt font"); 42 43 /* Some limits to prevent abnormal fonts from being loaded. */ 44 #define VTFONT_MAXMAPPINGS 8192 45 #define VTFONT_MAXGLYPHSIZE 1048576 46 #define VTFONT_MAXDIMENSION 128 47 48 static uint16_t 49 vtfont_bisearch(const struct vt_font_map *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 /* 93 * No support for printing right hand sides for CJK fullwidth 94 * characters. Simply print a space and assume that the left 95 * hand side describes the entire character. 96 */ 97 src = TCHAR_CHARACTER(c); 98 if (TCHAR_FORMAT(c) & TF_CJK_RIGHT) { 99 normal_map = VFNT_MAP_NORMAL_RIGHT; 100 bold_map = VFNT_MAP_BOLD_RIGHT; 101 } else { 102 normal_map = VFNT_MAP_NORMAL; 103 bold_map = VFNT_MAP_BOLD; 104 } 105 106 if (TCHAR_FORMAT(c) & TF_BOLD) { 107 dst = vtfont_bisearch(vf->vf_map[bold_map], 108 vf->vf_map_count[bold_map], src); 109 if (dst != 0) 110 goto found; 111 } 112 dst = vtfont_bisearch(vf->vf_map[normal_map], 113 vf->vf_map_count[normal_map], src); 114 115 found: 116 stride = howmany(vf->vf_width, 8) * vf->vf_height; 117 return (&vf->vf_bytes[dst * stride]); 118 } 119 120 struct vt_font * 121 vtfont_ref(struct vt_font *vf) 122 { 123 124 refcount_acquire(&vf->vf_refcount); 125 return (vf); 126 } 127 128 void 129 vtfont_unref(struct vt_font *vf) 130 { 131 unsigned int i; 132 133 if (refcount_release(&vf->vf_refcount)) { 134 for (i = 0; i < VFNT_MAPS; i++) 135 free(vf->vf_map[i], M_VTFONT); 136 free(vf->vf_bytes, M_VTFONT); 137 free(vf, M_VTFONT); 138 } 139 } 140 141 static int 142 vtfont_validate_map(struct vt_font_map *vfm, unsigned int length, 143 unsigned int glyph_count) 144 { 145 unsigned int i, last = 0; 146 147 for (i = 0; i < length; i++) { 148 /* Not ordered. */ 149 if (i > 0 && vfm[i].vfm_src <= last) 150 return (EINVAL); 151 /* 152 * Destination extends amount of glyphs. 153 */ 154 if (vfm[i].vfm_dst >= glyph_count || 155 vfm[i].vfm_dst + vfm[i].vfm_len >= glyph_count) 156 return (EINVAL); 157 last = vfm[i].vfm_src + vfm[i].vfm_len; 158 } 159 160 return (0); 161 } 162 163 int 164 vtfont_load(vfnt_t *f, struct vt_font **ret) 165 { 166 size_t glyphsize, mapsize; 167 struct vt_font *vf; 168 int error; 169 unsigned int i; 170 171 /* Make sure the dimensions are valid. */ 172 if (f->width < 1 || f->height < 1) 173 return (EINVAL); 174 if (f->width > VTFONT_MAXDIMENSION || f->height > VTFONT_MAXDIMENSION) 175 return (E2BIG); 176 177 /* Not too many mappings. */ 178 for (i = 0; i < VFNT_MAPS; i++) 179 if (f->map_count[i] > VTFONT_MAXMAPPINGS) 180 return (E2BIG); 181 182 /* Character 0 must always be present. */ 183 if (f->glyph_count < 1) 184 return (EINVAL); 185 186 glyphsize = howmany(f->width, 8) * f->height * f->glyph_count; 187 if (glyphsize > VTFONT_MAXGLYPHSIZE) 188 return (E2BIG); 189 190 /* Allocate new font structure. */ 191 vf = malloc(sizeof *vf, M_VTFONT, M_WAITOK | M_ZERO); 192 vf->vf_bytes = malloc(glyphsize, M_VTFONT, M_WAITOK); 193 vf->vf_height = f->height; 194 vf->vf_width = f->width; 195 vf->vf_refcount = 1; 196 197 /* Allocate, copy in, and validate mappings. */ 198 for (i = 0; i < VFNT_MAPS; i++) { 199 vf->vf_map_count[i] = f->map_count[i]; 200 if (f->map_count[i] == 0) 201 continue; 202 mapsize = f->map_count[i] * sizeof(struct vt_font_map); 203 vf->vf_map[i] = malloc(mapsize, M_VTFONT, M_WAITOK); 204 error = copyin(f->map[i], vf->vf_map[i], mapsize); 205 if (error) 206 goto bad; 207 error = vtfont_validate_map(vf->vf_map[i], vf->vf_map_count[i], 208 f->glyph_count); 209 if (error) 210 goto bad; 211 } 212 213 /* Copy in glyph data. */ 214 error = copyin(f->glyphs, vf->vf_bytes, glyphsize); 215 if (error) 216 goto bad; 217 218 /* Success. */ 219 *ret = vf; 220 return (0); 221 222 bad: vtfont_unref(vf); 223 return (error); 224 } 225