kc3-lang/harfbuzz/src/hb-utf.hh

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• Hash : c77ae408
  Author :
  Date : 2018-08-25T22:36:36
  

  Rename hb-*private.hh to hb-*.hh
  
  Sorry for the noise, downstream custom builders.  Please adjust.
  

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• src/hb-utf.hh

• /*
   * Copyright © 2011,2012,2014  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_UTF_HH
  #define HB_UTF_HH
  
  #include "hb.hh"
  
  
  struct hb_utf8_t
  {
    typedef uint8_t codepoint_t;
  
    static inline const uint8_t *
    next (const uint8_t *text,
  	const uint8_t *end,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      /* Written to only accept well-formed sequences.
       * Based on ideas from ICU's U8_NEXT.
       * Generates one "replacement" for each ill-formed byte. */
  
      hb_codepoint_t c = *text++;
  
      if (c > 0x7Fu)
      {
        if (hb_in_range<hb_codepoint_t> (c, 0xC2u, 0xDFu)) /* Two-byte */
        {
  	unsigned int t1;
  	if (likely (text < end &&
  		    (t1 = text[0] - 0x80u) <= 0x3Fu))
  	{
  	  c = ((c&0x1Fu)<<6) | t1;
  	  text++;
  	}
  	else
  	  goto error;
        }
        else if (hb_in_range<hb_codepoint_t> (c, 0xE0u, 0xEFu)) /* Three-byte */
        {
  	unsigned int t1, t2;
  	if (likely (1 < end - text &&
  		    (t1 = text[0] - 0x80u) <= 0x3Fu &&
  		    (t2 = text[1] - 0x80u) <= 0x3Fu))
  	{
  	  c = ((c&0xFu)<<12) | (t1<<6) | t2;
  	  if (unlikely (c < 0x0800u || hb_in_range<hb_codepoint_t> (c, 0xD800u, 0xDFFFu)))
  	    goto error;
  	  text += 2;
  	}
  	else
  	  goto error;
        }
        else if (hb_in_range<hb_codepoint_t> (c, 0xF0u, 0xF4u)) /* Four-byte */
        {
  	unsigned int t1, t2, t3;
  	if (likely (2 < end - text &&
  		    (t1 = text[0] - 0x80u) <= 0x3Fu &&
  		    (t2 = text[1] - 0x80u) <= 0x3Fu &&
  		    (t3 = text[2] - 0x80u) <= 0x3Fu))
  	{
  	  c = ((c&0x7u)<<18) | (t1<<12) | (t2<<6) | t3;
  	  if (unlikely (!hb_in_range<hb_codepoint_t> (c, 0x10000u, 0x10FFFFu)))
  	    goto error;
  	  text += 3;
  	}
  	else
  	  goto error;
        }
        else
  	goto error;
      }
  
      *unicode = c;
      return text;
  
    error:
      *unicode = replacement;
      return text;
    }
  
    static inline const uint8_t *
    prev (const uint8_t *text,
  	const uint8_t *start,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      const uint8_t *end = text--;
      while (start < text && (*text & 0xc0) == 0x80 && end - text < 4)
        text--;
  
      if (likely (next (text, end, unicode, replacement) == end))
        return text;
  
      *unicode = replacement;
      return end - 1;
    }
  
    static inline unsigned int
    strlen (const uint8_t *text)
    {
      return ::strlen ((const char *) text);
    }
  };
  
  
  struct hb_utf16_t
  {
    typedef uint16_t codepoint_t;
  
    static inline const uint16_t *
    next (const uint16_t *text,
  	const uint16_t *end,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      hb_codepoint_t c = *text++;
  
      if (likely (!hb_in_range<hb_codepoint_t> (c, 0xD800u, 0xDFFFu)))
      {
        *unicode = c;
        return text;
      }
  
      if (likely (c <= 0xDBFFu && text < end))
      {
        /* High-surrogate in c */
        hb_codepoint_t l = *text;
        if (likely (hb_in_range<hb_codepoint_t> (l, 0xDC00u, 0xDFFFu)))
        {
  	/* Low-surrogate in l */
  	*unicode = (c << 10) + l - ((0xD800u << 10) - 0x10000u + 0xDC00u);
  	 text++;
  	 return text;
        }
      }
  
      /* Lonely / out-of-order surrogate. */
      *unicode = replacement;
      return text;
    }
  
    static inline const uint16_t *
    prev (const uint16_t *text,
  	const uint16_t *start,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      hb_codepoint_t c = *--text;
  
      if (likely (!hb_in_range<hb_codepoint_t> (c, 0xD800u, 0xDFFFu)))
      {
        *unicode = c;
        return text;
      }
  
      if (likely (c >= 0xDC00u && start < text))
      {
        /* Low-surrogate in c */
        hb_codepoint_t h = text[-1];
        if (likely (hb_in_range<hb_codepoint_t> (h, 0xD800u, 0xDBFFu)))
        {
          /* High-surrogate in h */
          *unicode = (h << 10) + c - ((0xD800u << 10) - 0x10000u + 0xDC00u);
          text--;
          return text;
        }
      }
  
      /* Lonely / out-of-order surrogate. */
      *unicode = replacement;
      return text;
    }
  
  
    static inline unsigned int
    strlen (const uint16_t *text)
    {
      unsigned int l = 0;
      while (*text++) l++;
      return l;
    }
  };
  
  
  template <bool validate=true>
  struct hb_utf32_t
  {
    typedef uint32_t codepoint_t;
  
    static inline const uint32_t *
    next (const uint32_t *text,
  	const uint32_t *end HB_UNUSED,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      hb_codepoint_t c = *unicode = *text++;
      if (validate && unlikely (c >= 0xD800u && (c <= 0xDFFFu || c > 0x10FFFFu)))
        *unicode = replacement;
      return text;
    }
  
    static inline const uint32_t *
    prev (const uint32_t *text,
  	const uint32_t *start HB_UNUSED,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      hb_codepoint_t c = *unicode = *--text;
      if (validate && unlikely (c >= 0xD800u && (c <= 0xDFFFu || c > 0x10FFFFu)))
        *unicode = replacement;
      return text;
    }
  
    static inline unsigned int
    strlen (const uint32_t *text)
    {
      unsigned int l = 0;
      while (*text++) l++;
      return l;
    }
  };
  
  
  struct hb_latin1_t
  {
    typedef uint8_t codepoint_t;
  
    static inline const uint8_t *
    next (const uint8_t *text,
  	const uint8_t *end HB_UNUSED,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement HB_UNUSED)
    {
      *unicode = *text++;
      return text;
    }
  
    static inline const uint8_t *
    prev (const uint8_t *text,
  	const uint8_t *start HB_UNUSED,
  	hb_codepoint_t *unicode,
  	hb_codepoint_t replacement)
    {
      *unicode = *--text;
      return text;
    }
  
    static inline unsigned int
    strlen (const uint8_t *text)
    {
      unsigned int l = 0;
      while (*text++) l++;
      return l;
    }
  };
  
  #endif /* HB_UTF_HH */
  

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