512 lines
12 KiB
C
512 lines
12 KiB
C
/* Copyright (C) 2010-2020 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (encoding_utf.c).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <boolean.h>
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#include <compat/strl.h>
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#include <retro_inline.h>
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#include <encodings/utf.h>
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#if defined(_WIN32) && !defined(_XBOX)
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#include <windows.h>
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#elif defined(_XBOX)
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#include <xtl.h>
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#endif
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#define UTF8_WALKBYTE(string) (*((*(string))++))
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static unsigned leading_ones(uint8_t c)
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{
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unsigned ones = 0;
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while (c & 0x80)
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{
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ones++;
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c <<= 1;
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}
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return ones;
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}
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/* Simple implementation. Assumes the sequence is
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* properly synchronized and terminated. */
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size_t utf8_conv_utf32(uint32_t *out, size_t out_chars,
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const char *in, size_t in_size)
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{
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unsigned i;
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size_t ret = 0;
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while (in_size && out_chars)
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{
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unsigned extra, shift;
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uint32_t c;
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uint8_t first = *in++;
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unsigned ones = leading_ones(first);
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if (ones > 6 || ones == 1) /* Invalid or desync. */
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break;
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extra = ones ? ones - 1 : ones;
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if (1 + extra > in_size) /* Overflow. */
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break;
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shift = (extra - 1) * 6;
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c = (first & ((1 << (7 - ones)) - 1)) << (6 * extra);
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for (i = 0; i < extra; i++, in++, shift -= 6)
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c |= (*in & 0x3f) << shift;
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*out++ = c;
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in_size -= 1 + extra;
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out_chars--;
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ret++;
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}
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return ret;
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}
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bool utf16_conv_utf8(uint8_t *out, size_t *out_chars,
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const uint16_t *in, size_t in_size)
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{
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size_t out_pos = 0;
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size_t in_pos = 0;
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static const
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uint8_t utf8_limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
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for (;;)
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{
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unsigned num_adds;
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uint32_t value;
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if (in_pos == in_size)
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{
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*out_chars = out_pos;
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return true;
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}
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value = in[in_pos++];
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if (value < 0x80)
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{
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if (out)
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out[out_pos] = (char)value;
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out_pos++;
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continue;
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}
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if (value >= 0xD800 && value < 0xE000)
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{
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uint32_t c2;
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if (value >= 0xDC00 || in_pos == in_size)
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break;
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c2 = in[in_pos++];
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if (c2 < 0xDC00 || c2 >= 0xE000)
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break;
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value = (((value - 0xD800) << 10) | (c2 - 0xDC00)) + 0x10000;
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}
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for (num_adds = 1; num_adds < 5; num_adds++)
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if (value < (((uint32_t)1) << (num_adds * 5 + 6)))
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break;
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if (out)
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out[out_pos] = (char)(utf8_limits[num_adds - 1]
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+ (value >> (6 * num_adds)));
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out_pos++;
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do
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{
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num_adds--;
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if (out)
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out[out_pos] = (char)(0x80
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+ ((value >> (6 * num_adds)) & 0x3F));
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out_pos++;
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}while (num_adds != 0);
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}
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*out_chars = out_pos;
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return false;
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}
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/* Acts mostly like strlcpy.
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*
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* Copies the given number of UTF-8 characters,
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* but at most d_len bytes.
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*
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* Always NULL terminates.
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* Does not copy half a character.
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*
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* Returns number of bytes. 's' is assumed valid UTF-8.
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* Use only if 'chars' is considerably less than 'd_len'. */
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size_t utf8cpy(char *d, size_t d_len, const char *s, size_t chars)
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{
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const uint8_t *sb = (const uint8_t*)s;
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const uint8_t *sb_org = sb;
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if (!s)
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return 0;
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while (*sb && chars-- > 0)
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{
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sb++;
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while ((*sb & 0xC0) == 0x80)
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sb++;
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}
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if ((size_t)(sb - sb_org) > d_len-1 /* NUL */)
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{
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sb = sb_org + d_len-1;
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while ((*sb & 0xC0) == 0x80)
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sb--;
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}
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memcpy(d, sb_org, sb-sb_org);
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d[sb-sb_org] = '\0';
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return sb-sb_org;
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}
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const char *utf8skip(const char *str, size_t chars)
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{
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const uint8_t *strb = (const uint8_t*)str;
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if (!chars)
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return str;
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do
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{
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strb++;
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while ((*strb & 0xC0)==0x80)
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strb++;
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chars--;
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}while (chars);
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return (const char*)strb;
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}
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size_t utf8len(const char *string)
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{
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size_t ret = 0;
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if (!string)
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return 0;
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while (*string)
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{
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if ((*string & 0xC0) != 0x80)
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ret++;
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string++;
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}
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return ret;
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}
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/* Does not validate the input, returns garbage if it's not UTF-8. */
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uint32_t utf8_walk(const char **string)
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{
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uint8_t first = UTF8_WALKBYTE(string);
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uint32_t ret = 0;
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if (first < 128)
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return first;
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ret = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
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if (first >= 0xE0)
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{
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ret = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
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if (first >= 0xF0)
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{
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ret = (ret << 6) | (UTF8_WALKBYTE(string) & 0x3F);
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return ret | (first & 7) << 18;
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}
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return ret | (first & 15) << 12;
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}
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return ret | (first & 31) << 6;
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}
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static bool utf16_to_char(uint8_t **utf_data,
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size_t *dest_len, const uint16_t *in)
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{
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unsigned len = 0;
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while (in[len] != '\0')
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len++;
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utf16_conv_utf8(NULL, dest_len, in, len);
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*dest_len += 1;
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*utf_data = (uint8_t*)malloc(*dest_len);
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if (*utf_data == 0)
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return false;
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return utf16_conv_utf8(*utf_data, dest_len, in, len);
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}
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bool utf16_to_char_string(const uint16_t *in, char *s, size_t len)
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{
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size_t dest_len = 0;
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uint8_t *utf16_data = NULL;
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bool ret = utf16_to_char(&utf16_data, &dest_len, in);
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if (ret)
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{
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utf16_data[dest_len] = 0;
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strlcpy(s, (const char*)utf16_data, len);
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}
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free(utf16_data);
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utf16_data = NULL;
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return ret;
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}
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#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
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/* Returned pointer MUST be freed by the caller if non-NULL. */
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static char *mb_to_mb_string_alloc(const char *str,
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enum CodePage cp_in, enum CodePage cp_out)
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{
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wchar_t *path_buf_wide = NULL;
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int path_buf_wide_len = MultiByteToWideChar(cp_in, 0, str, -1, NULL, 0);
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/* Windows 95 will return 0 from these functions with
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* a UTF8 codepage set without MSLU.
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*
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* From an unknown MSDN version (others omit this info):
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* - CP_UTF8 Windows 98/Me, Windows NT 4.0 and later:
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* Translate using UTF-8. When this is set, dwFlags must be zero.
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* - Windows 95: Under the Microsoft Layer for Unicode,
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* MultiByteToWideChar also supports CP_UTF7 and CP_UTF8.
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*/
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if (!path_buf_wide_len)
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return strdup(str);
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path_buf_wide = (wchar_t*)
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calloc(path_buf_wide_len + sizeof(wchar_t), sizeof(wchar_t));
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if (path_buf_wide)
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{
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MultiByteToWideChar(cp_in, 0,
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str, -1, path_buf_wide, path_buf_wide_len);
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if (*path_buf_wide)
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{
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int path_buf_len = WideCharToMultiByte(cp_out, 0,
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path_buf_wide, -1, NULL, 0, NULL, NULL);
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if (path_buf_len)
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{
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char *path_buf = (char*)
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calloc(path_buf_len + sizeof(char), sizeof(char));
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if (path_buf)
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{
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WideCharToMultiByte(cp_out, 0,
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path_buf_wide, -1, path_buf,
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path_buf_len, NULL, NULL);
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free(path_buf_wide);
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if (*path_buf)
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return path_buf;
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free(path_buf);
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return NULL;
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}
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}
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else
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{
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free(path_buf_wide);
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return strdup(str);
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}
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}
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free(path_buf_wide);
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}
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return NULL;
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}
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#endif
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/* Returned pointer MUST be freed by the caller if non-NULL. */
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char* utf8_to_local_string_alloc(const char *str)
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{
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if (str && *str)
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{
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#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
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return mb_to_mb_string_alloc(str, CODEPAGE_UTF8, CODEPAGE_LOCAL);
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#else
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/* assume string needs no modification if not on Windows */
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return strdup(str);
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#endif
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}
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return NULL;
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}
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/* Returned pointer MUST be freed by the caller if non-NULL. */
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char* local_to_utf8_string_alloc(const char *str)
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{
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if (str && *str)
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{
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#if defined(_WIN32) && !defined(_XBOX) && !defined(UNICODE)
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return mb_to_mb_string_alloc(str, CODEPAGE_LOCAL, CODEPAGE_UTF8);
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#else
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/* assume string needs no modification if not on Windows */
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return strdup(str);
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#endif
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}
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return NULL;
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}
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/* Returned pointer MUST be freed by the caller if non-NULL. */
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wchar_t* utf8_to_utf16_string_alloc(const char *str)
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{
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#ifdef _WIN32
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int len = 0;
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int out_len = 0;
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#else
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size_t len = 0;
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size_t out_len = 0;
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#endif
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wchar_t *buf = NULL;
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if (!str || !*str)
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return NULL;
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#ifdef _WIN32
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len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
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if (len)
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{
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buf = (wchar_t*)calloc(len, sizeof(wchar_t));
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if (!buf)
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return NULL;
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out_len = MultiByteToWideChar(CP_UTF8, 0, str, -1, buf, len);
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}
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else
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{
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/* fallback to ANSI codepage instead */
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len = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);
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if (len)
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{
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buf = (wchar_t*)calloc(len, sizeof(wchar_t));
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if (!buf)
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return NULL;
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out_len = MultiByteToWideChar(CP_ACP, 0, str, -1, buf, len);
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}
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}
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if (out_len < 0)
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{
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free(buf);
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return NULL;
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}
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#else
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/* NOTE: For now, assume non-Windows platforms' locale is already UTF-8. */
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len = mbstowcs(NULL, str, 0) + 1;
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if (len)
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{
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buf = (wchar_t*)calloc(len, sizeof(wchar_t));
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if (!buf)
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return NULL;
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out_len = mbstowcs(buf, str, len);
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}
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if (out_len == (size_t)-1)
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{
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free(buf);
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return NULL;
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}
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#endif
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return buf;
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}
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/* Returned pointer MUST be freed by the caller if non-NULL. */
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char* utf16_to_utf8_string_alloc(const wchar_t *str)
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{
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#ifdef _WIN32
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int len = 0;
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#else
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size_t len = 0;
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#endif
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char *buf = NULL;
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if (!str || !*str)
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return NULL;
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#ifdef _WIN32
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{
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UINT code_page = CP_UTF8;
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len = WideCharToMultiByte(code_page,
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0, str, -1, NULL, 0, NULL, NULL);
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/* fallback to ANSI codepage instead */
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if (!len)
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{
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code_page = CP_ACP;
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len = WideCharToMultiByte(code_page,
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0, str, -1, NULL, 0, NULL, NULL);
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}
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buf = (char*)calloc(len, sizeof(char));
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if (!buf)
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return NULL;
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if (WideCharToMultiByte(code_page,
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0, str, -1, buf, len, NULL, NULL) < 0)
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{
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free(buf);
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return NULL;
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}
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}
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#else
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/* NOTE: For now, assume non-Windows platforms'
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* locale is already UTF-8. */
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len = wcstombs(NULL, str, 0) + 1;
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if (len)
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{
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buf = (char*)calloc(len, sizeof(char));
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if (!buf)
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return NULL;
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if (wcstombs(buf, str, len) == (size_t)-1)
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{
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free(buf);
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return NULL;
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}
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}
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#endif
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return buf;
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}
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