+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-/*
- * Unifont
- * This implements the unifont glyph-array parser and provides it via a simple
- * API to the caller. No heavy transformations are performed so glyph-lookups
- * stay as fast as possible.
- */
-
-#include <endian.h>
-#include <fcntl.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include "macro.h"
-#include "unifont-def.h"
-#include "unifont.h"
-#include "util.h"
-
-struct unifont {
- unsigned long ref;
-
- int fd;
- const uint8_t *map;
- size_t size;
-
- unifont_header header;
- const void *glyphs; /* unaligned! */
- size_t n_glyphs;
- size_t glyphsize;
-};
-
-static int unifont_fetch_header(unifont *u) {
- unifont_header h = { };
- uint64_t glyphsize;
-
- if (u->size < UNIFONT_HEADER_SIZE_MIN)
- return -EBFONT;
-
- assert_cc(sizeof(h) >= UNIFONT_HEADER_SIZE_MIN);
- memcpy(&h, u->map, UNIFONT_HEADER_SIZE_MIN);
-
- h.compatible_flags = le32toh(h.compatible_flags);
- h.incompatible_flags = le32toh(h.incompatible_flags);
- h.header_size = le32toh(h.header_size);
- h.glyph_header_size = le16toh(h.glyph_header_size);
- h.glyph_stride = le16toh(h.glyph_stride);
- h.glyph_body_size = le64toh(h.glyph_body_size);
-
- if (memcmp(h.signature, "DVDHRMUF", 8))
- return -EBFONT;
- if (h.incompatible_flags != 0)
- return -EBFONT;
- if (h.header_size < UNIFONT_HEADER_SIZE_MIN || h.header_size > u->size)
- return -EBFONT;
- if (h.glyph_header_size + h.glyph_body_size < h.glyph_header_size)
- return -EBFONT;
- if (h.glyph_stride * 16ULL > h.glyph_body_size)
- return -EBFONT;
-
- glyphsize = h.glyph_header_size + h.glyph_body_size;
-
- if (glyphsize == 0 || glyphsize > u->size - h.header_size) {
- u->n_glyphs = 0;
- } else {
- u->glyphs = u->map + h.header_size;
- u->n_glyphs = (u->size - h.header_size) / glyphsize;
- u->glyphsize = glyphsize;
- }
-
- memcpy(&u->header, &h, sizeof(h));
- return 0;
-}
-
-static int unifont_fetch_glyph(unifont *u, unifont_glyph_header *out_header, const void **out_body, uint32_t ucs4) {
- unifont_glyph_header glyph_header = { };
- const void *glyph_body = NULL;
- const uint8_t *p;
-
- if (ucs4 >= u->n_glyphs)
- return -ENOENT;
-
- p = u->glyphs;
-
- /* copy glyph-header data */
- p += ucs4 * u->glyphsize;
- memcpy(&glyph_header, p, MIN(sizeof(glyph_header), u->header.glyph_header_size));
-
- /* copy glyph-body pointer */
- p += u->header.glyph_header_size;
- glyph_body = p;
-
- if (glyph_header.width < 1)
- return -ENOENT;
- if (glyph_header.width > u->header.glyph_stride)
- return -EBFONT;
-
- memcpy(out_header, &glyph_header, sizeof(glyph_header));
- *out_body = glyph_body;
- return 0;
-}
-
-int unifont_new(unifont **out) {
- _cleanup_(unifont_unrefp) unifont *u = NULL;
- struct stat st;
- int r;
-
- assert_return(out, -EINVAL);
-
- u = new0(unifont, 1);
- if (!u)
- return -ENOMEM;
-
- u->ref = 1;
- u->fd = -1;
- u->map = MAP_FAILED;
-
- u->fd = open(UNIFONT_PATH, O_RDONLY | O_CLOEXEC | O_NOCTTY);
- if (u->fd < 0)
- return -errno;
-
- r = fstat(u->fd, &st);
- if (r < 0)
- return -errno;
-
- u->size = st.st_size;
- u->map = mmap(NULL, u->size, PROT_READ, MAP_PRIVATE, u->fd, 0);
- if (u->map == MAP_FAILED)
- return -errno;
-
- r = unifont_fetch_header(u);
- if (r < 0)
- return r;
-
- *out = u;
- u = NULL;
- return 0;
-}
-
-unifont *unifont_ref(unifont *u) {
- if (!u || !u->ref)
- return NULL;
-
- ++u->ref;
-
- return u;
-}
-
-unifont *unifont_unref(unifont *u) {
- if (!u || !u->ref || --u->ref)
- return NULL;
-
- if (u->map != MAP_FAILED)
- munmap((void*)u->map, u->size);
- u->fd = safe_close(u->fd);
- free(u);
-
- return NULL;
-}
-
-unsigned int unifont_get_width(unifont *u) {
- assert(u);
-
- return 8U;
-}
-
-unsigned int unifont_get_height(unifont *u) {
- assert(u);
-
- return 16U;
-}
-
-unsigned int unifont_get_stride(unifont *u) {
- assert(u);
-
- return u->header.glyph_stride;
-}
-
-int unifont_lookup(unifont *u, unifont_glyph *out, uint32_t ucs4) {
- unifont_glyph_header h = { };
- const void *b = NULL;
- unifont_glyph g = { };
- int r;
-
- assert_return(u, -EINVAL);
-
- r = unifont_fetch_glyph(u, &h, &b, ucs4);
- if (r < 0)
- return r;
-
- g.width = h.width * 8U;
- g.height = 16U;
- g.stride = u->header.glyph_stride;
- g.cwidth = h.width;
- g.data = b;
-
- if (out)
- memcpy(out, &g, sizeof(g));
- return 0;
-}
-
-void unifont_fallback(unifont_glyph *out) {
- static const uint8_t fallback_data[] = {
- /* unifont 0xfffd '�' (unicode replacement character) */
- 0x00, 0x00, 0x00, 0x7e,
- 0x66, 0x5a, 0x5a, 0x7a,
- 0x76, 0x76, 0x7e, 0x76,
- 0x76, 0x7e, 0x00, 0x00,
- };
-
- assert(out);
-
- out->width = 8;
- out->height = 16;
- out->stride = 1;
- out->cwidth = 1;
- out->data = fallback_data;
-}
~ianmdlvl / elogind.git / blobdiff