f53df7da64
Code submissions have continually suffered from formatting inconsistencies that constantly have to be addressed. Using clang-format simplifies this by making code formatting more consistent, and allows automation of the code formatting so that maintainers can focus more on the code itself instead of code formatting.
374 lines
8.5 KiB
C
374 lines
8.5 KiB
C
/*
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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 <wchar.h>
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#include "utf8.h"
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#ifdef _WIN32
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#include <windows.h>
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#include "c99defs.h"
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static inline bool has_utf8_bom(const char *in_char)
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{
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uint8_t *in = (uint8_t *)in_char;
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return (in && in[0] == 0xef && in[1] == 0xbb && in[2] == 0xbf);
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}
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size_t utf8_to_wchar(const char *in, size_t insize, wchar_t *out,
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size_t outsize, int flags)
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{
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int i_insize = (int)insize;
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int ret;
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if (i_insize == 0)
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i_insize = (int)strlen(in);
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/* prevent bom from being used in the string */
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if (has_utf8_bom(in)) {
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if (i_insize >= 3) {
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in += 3;
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i_insize -= 3;
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}
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}
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ret = MultiByteToWideChar(CP_UTF8, 0, in, i_insize, out, (int)outsize);
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UNUSED_PARAMETER(flags);
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return (ret > 0) ? (size_t)ret : 0;
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}
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size_t wchar_to_utf8(const wchar_t *in, size_t insize, char *out,
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size_t outsize, int flags)
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{
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int i_insize = (int)insize;
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int ret;
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if (i_insize == 0)
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i_insize = (int)wcslen(in);
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ret = WideCharToMultiByte(CP_UTF8, 0, in, i_insize, out, (int)outsize,
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NULL, NULL);
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UNUSED_PARAMETER(flags);
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return (ret > 0) ? (size_t)ret : 0;
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}
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#else
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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_forbidden(wchar_t sym);
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static int utf8_forbidden(unsigned char octet);
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static int wchar_forbidden(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 utf8_forbidden(unsigned 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. If insize is 0,
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* function continues until a null terminator is reached.
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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 forbidden (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 utf8_to_wchar(const char *in, size_t insize, wchar_t *out,
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size_t outsize, int flags)
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{
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unsigned 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 || (outsize == 0 && out != NULL))
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return 0;
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total = 0;
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p = (unsigned char *)in;
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lim = (insize != 0) ? (p + insize) : (unsigned char *)-1;
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wlim = out + outsize;
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for (; p < lim; p += n) {
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if (!*p)
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break;
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if (utf8_forbidden(*p) != 0 && (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 ((size_t)(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 (wchar_forbidden(*out) != 0) {
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if ((flags & UTF8_IGNORE_ERROR) == 0)
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return 0; /* forbidden 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. If insize is 0,
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* function continues until a null terminator is reaches.
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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 wchar_to_utf8(const wchar_t *in, size_t insize, char *out,
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size_t outsize, int flags)
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{
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wchar_t *w, *wlim, ch = 0;
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unsigned char *p, *lim, *oc;
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size_t total, n;
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if (in == NULL || (outsize == 0 && out != NULL))
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return 0;
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w = (wchar_t *)in;
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wlim = (insize != 0) ? (w + insize) : (wchar_t *)-1;
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p = (unsigned 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 (!*w)
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break;
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if (wchar_forbidden(*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 ((size_t)(lim - p) <= n - 1)
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return 0; /* no space left */
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ch = *w;
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oc = (unsigned char *)&ch;
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switch (n) {
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case 1:
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*p = oc[0];
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break;
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case 2:
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p[1] = _NXT | (oc[0] & 0x3f);
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p[0] = _SEQ2 | (oc[0] >> 6) | ((oc[1] & 0x07) << 2);
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break;
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case 3:
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p[2] = _NXT | (oc[0] & 0x3f);
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p[1] = _NXT | (oc[0] >> 6) | ((oc[1] & 0x0f) << 2);
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p[0] = _SEQ3 | ((oc[1] & 0xf0) >> 4);
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break;
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case 4:
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p[3] = _NXT | (oc[0] & 0x3f);
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p[2] = _NXT | (oc[0] >> 6) | ((oc[1] & 0x0f) << 2);
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p[1] = _NXT | ((oc[1] & 0xf0) >> 4) |
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((oc[2] & 0x03) << 4);
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p[0] = _SEQ4 | ((oc[2] & 0x1f) >> 2);
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break;
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case 5:
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p[4] = _NXT | (oc[0] & 0x3f);
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p[3] = _NXT | (oc[0] >> 6) | ((oc[1] & 0x0f) << 2);
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p[2] = _NXT | ((oc[1] & 0xf0) >> 4) |
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((oc[2] & 0x03) << 4);
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p[1] = _NXT | (oc[2] >> 2);
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p[0] = _SEQ5 | (oc[3] & 0x03);
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break;
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case 6:
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p[5] = _NXT | (oc[0] & 0x3f);
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p[4] = _NXT | (oc[0] >> 6) | ((oc[1] & 0x0f) << 2);
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p[3] = _NXT | (oc[1] >> 4) | ((oc[2] & 0x03) << 4);
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p[2] = _NXT | (oc[2] >> 2);
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p[1] = _NXT | (oc[3] & 0x3f);
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p[0] = _SEQ6 | ((oc[3] & 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 forbidden UTF-8 characters.
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* They cannot appear here because we do proper conversion.
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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
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