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https://we.phorge.it/source/phorge.git
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327 lines
7.4 KiB
C
327 lines
7.4 KiB
C
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#ifdef TLF_FONTS
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/*
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* Copyright (c) 2007 Alexey Vatchenko <av@bsdua.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <wchar.h>
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#include <arpa/inet.h> /* for htonl() */
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#include "utf8.h"
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#define _NXT 0x80
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#define _SEQ2 0xc0
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#define _SEQ3 0xe0
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#define _SEQ4 0xf0
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#define _SEQ5 0xf8
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#define _SEQ6 0xfc
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#define _BOM 0xfeff
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static int __wchar_forbitten(wchar_t sym);
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static int __utf8_forbitten(u_char octet);
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static int
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__wchar_forbitten(wchar_t sym)
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{
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/* Surrogate pairs */
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if (sym >= 0xd800 && sym <= 0xdfff)
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return (-1);
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return (0);
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}
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static int
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__utf8_forbitten(u_char octet)
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{
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switch (octet) {
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case 0xc0:
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case 0xc1:
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case 0xf5:
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case 0xff:
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return (-1);
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}
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return (0);
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}
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/*
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* DESCRIPTION
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* This function translates UTF-8 string into UCS-4 string (all symbols
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* will be in local machine byte order).
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*
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* It takes the following arguments:
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* in - input UTF-8 string. It can be null-terminated.
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* insize - size of input string in bytes.
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* out - result buffer for UCS-4 string. If out is NULL,
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* function returns size of result buffer.
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* outsize - size of out buffer in wide characters.
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*
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* RETURN VALUES
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* The function returns size of result buffer (in wide characters).
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* Zero is returned in case of error.
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*
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* CAVEATS
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* 1. If UTF-8 string contains zero symbols, they will be translated
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* as regular symbols.
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* 2. If UTF8_IGNORE_ERROR or UTF8_SKIP_BOM flag is set, sizes may vary
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* when `out' is NULL and not NULL. It's because of special UTF-8
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* sequences which may result in forbitten (by RFC3629) UNICODE
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* characters. So, the caller must check return value every time and
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* not prepare buffer in advance (\0 terminate) but after calling this
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* function.
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*/
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size_t
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utf8_to_wchar(const char *in, size_t insize, wchar_t *out, size_t outsize,
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int flags)
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{
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u_char *p, *lim;
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wchar_t *wlim, high;
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size_t n, total, i, n_bits;
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if (in == NULL || insize == 0 || (outsize == 0 && out != NULL))
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return (0);
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total = 0;
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p = (u_char *)in;
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lim = p + insize;
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wlim = out + outsize;
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for (; p < lim; p += n) {
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if (__utf8_forbitten(*p) != 0 &&
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(flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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/*
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* Get number of bytes for one wide character.
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*/
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n = 1; /* default: 1 byte. Used when skipping bytes. */
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if ((*p & 0x80) == 0)
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high = (wchar_t)*p;
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else if ((*p & 0xe0) == _SEQ2) {
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n = 2;
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high = (wchar_t)(*p & 0x1f);
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} else if ((*p & 0xf0) == _SEQ3) {
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n = 3;
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high = (wchar_t)(*p & 0x0f);
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} else if ((*p & 0xf8) == _SEQ4) {
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n = 4;
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high = (wchar_t)(*p & 0x07);
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} else if ((*p & 0xfc) == _SEQ5) {
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n = 5;
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high = (wchar_t)(*p & 0x03);
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} else if ((*p & 0xfe) == _SEQ6) {
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n = 6;
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high = (wchar_t)(*p & 0x01);
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} else {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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continue;
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}
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/* does the sequence header tell us truth about length? */
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if (lim - p <= n - 1) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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n = 1;
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continue; /* skip */
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}
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/*
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* Validate sequence.
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* All symbols must have higher bits set to 10xxxxxx
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*/
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if (n > 1) {
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for (i = 1; i < n; i++) {
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if ((p[i] & 0xc0) != _NXT)
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break;
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}
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if (i != n) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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n = 1;
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continue; /* skip */
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}
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}
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total++;
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if (out == NULL)
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continue;
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if (out >= wlim)
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return (0); /* no space left */
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*out = 0;
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n_bits = 0;
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for (i = 1; i < n; i++) {
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*out |= (wchar_t)(p[n - i] & 0x3f) << n_bits;
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n_bits += 6; /* 6 low bits in every byte */
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}
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*out |= high << n_bits;
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if (*out == 0) /* return at end of string */
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break;
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if (__wchar_forbitten(*out) != 0) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0); /* forbitten character */
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else {
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total--;
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out--;
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}
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} else if (*out == _BOM && (flags & UTF8_SKIP_BOM) != 0) {
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total--;
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out--;
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}
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out++;
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}
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return (total);
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}
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/*
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* DESCRIPTION
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* This function translates UCS-4 symbols (given in local machine
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* byte order) into UTF-8 string.
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*
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* It takes the following arguments:
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* in - input unicode string. It can be null-terminated.
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* insize - size of input string in wide characters.
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* out - result buffer for utf8 string. If out is NULL,
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* function returns size of result buffer.
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* outsize - size of result buffer.
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*
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* RETURN VALUES
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* The function returns size of result buffer (in bytes). Zero is returned
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* in case of error.
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*
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* CAVEATS
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* If UCS-4 string contains zero symbols, they will be translated
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* as regular symbols.
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*/
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size_t
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wchar_to_utf8(const wchar_t *in, size_t insize, char *out, size_t outsize,
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int flags)
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{
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wchar_t *w, *wlim, ch;
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u_char *p, *lim, *oc;
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size_t total, n;
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if (in == NULL || insize == 0 || (outsize == 0 && out != NULL))
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return (0);
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w = (wchar_t *)in;
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wlim = w + insize;
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p = (u_char *)out;
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lim = p + outsize;
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total = 0;
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for (; w < wlim; w++) {
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if (__wchar_forbitten(*w) != 0) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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else
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continue;
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}
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if (*w == _BOM && (flags & UTF8_SKIP_BOM) != 0)
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continue;
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if (*w < 0) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return (0);
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continue;
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} else if (*w <= 0x0000007f)
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n = 1;
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else if (*w <= 0x000007ff)
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n = 2;
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else if (*w <= 0x0000ffff)
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n = 3;
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else if (*w <= 0x001fffff)
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n = 4;
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else if (*w <= 0x03ffffff)
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n = 5;
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else /* if (*w <= 0x7fffffff) */
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n = 6;
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total += n;
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if (out == NULL)
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continue;
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if (lim - p <= n - 1)
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return (0); /* no space left */
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/* make it work under different endians */
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ch = htonl(*w);
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oc = (u_char *)&ch;
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switch (n) {
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case 1:
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*p = oc[3];
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break;
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case 2:
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p[1] = _NXT | (oc[3] & 0x3f);
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p[0] = _SEQ2 | (oc[3] >> 6) | ((oc[2] & 0x07) << 2);
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break;
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case 3:
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p[2] = _NXT | (oc[3] & 0x3f);
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p[1] = _NXT | (oc[3] >> 6) | ((oc[2] & 0x0f) << 2);
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p[0] = _SEQ3 | ((oc[2] & 0xf0) >> 4);
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break;
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case 4:
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p[3] = _NXT | (oc[3] & 0x3f);
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p[2] = _NXT | (oc[3] >> 6) | ((oc[2] & 0x0f) << 2);
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p[1] = _NXT | ((oc[2] & 0xf0) >> 4) |
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((oc[1] & 0x03) << 4);
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p[0] = _SEQ4 | ((oc[1] & 0x1f) >> 2);
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break;
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case 5:
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p[4] = _NXT | (oc[3] & 0x3f);
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p[3] = _NXT | (oc[3] >> 6) | ((oc[2] & 0x0f) << 2);
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p[2] = _NXT | ((oc[2] & 0xf0) >> 4) |
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((oc[1] & 0x03) << 4);
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p[1] = _NXT | (oc[1] >> 2);
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p[0] = _SEQ5 | (oc[0] & 0x03);
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break;
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case 6:
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p[5] = _NXT | (oc[3] & 0x3f);
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p[4] = _NXT | (oc[3] >> 6) | ((oc[2] & 0x0f) << 2);
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p[3] = _NXT | (oc[2] >> 4) | ((oc[1] & 0x03) << 4);
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p[2] = _NXT | (oc[1] >> 2);
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p[1] = _NXT | (oc[0] & 0x3f);
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p[0] = _SEQ6 | ((oc[0] & 0x40) >> 6);
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break;
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}
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/*
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* NOTE: do not check here for forbitten UTF-8 characters.
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* They cannot appear here because we do proper convertion.
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*/
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p += n;
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}
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return (total);
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}
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#endif /* TLF_FONTS */
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