mirror of
https://github.com/libretro/RetroArch
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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* Copyright (C) 2010-2015 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (encodings_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 <stddef.h>
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#include <retro_inline.h>
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static INLINE 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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