The Tor Browser: gfx/harfbuzz/src/hb-utf-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-utf-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-utf-private.hh

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * Copyright © 2011,2012  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_PRIVATE_HH
 #define HB_UTF_PRIVATE_HH
 #include "hb-private.hh"
 /* UTF-8 */
 #define HB_UTF8_COMPUTE(Char, Mask, Len) \
   if (Char < 128) { Len = 1; Mask = 0x7f; } \
   else if ((Char & 0xe0) == 0xc0) { Len = 2; Mask = 0x1f; } \
   else if ((Char & 0xf0) == 0xe0) { Len = 3; Mask = 0x0f; } \
   else if ((Char & 0xf8) == 0xf0) { Len = 4; Mask = 0x07; } \
   else Len = 0;
 static inline const uint8_t *
 hb_utf_next (const uint8_t *text,
 	     const uint8_t *end,
 	     hb_codepoint_t *unicode)
 {
   hb_codepoint_t c = *text, mask;
   unsigned int len;
   /* TODO check for overlong sequences? */
   HB_UTF8_COMPUTE (c, mask, len);
   if (unlikely (!len || (unsigned int) (end - text) < len)) {
     *unicode = -1;
     return text + 1;
   } else {
     hb_codepoint_t result;
     unsigned int i;
     result = c & mask;
     for (i = 1; i < len; i++)
       {
 	if (unlikely ((text[i] & 0xc0) != 0x80))
 	  {
 	    *unicode = -1;
 	    return text + 1;
 	  }
 	result <<= 6;
 	result |= (text[i] & 0x3f);
       }
     *unicode = result;
     return text + len;
   }
 }
 static inline const uint8_t *
 hb_utf_prev (const uint8_t *text,
 	     const uint8_t *start,
 	     hb_codepoint_t *unicode)
 {
   const uint8_t *end = text--;
   while (start < text && (*text & 0xc0) == 0x80 && end - text < 4)
     text--;
   hb_codepoint_t c = *text, mask;
   unsigned int len;
   /* TODO check for overlong sequences? */
   HB_UTF8_COMPUTE (c, mask, len);
   if (unlikely (!len || (unsigned int) (end - text) != len)) {
     *unicode = -1;
     return end - 1;
   } else {
     hb_codepoint_t result;
     unsigned int i;
     result = c & mask;
     for (i = 1; i < len; i++)
       {
 	result <<= 6;
 	result |= (text[i] & 0x3f);
       }
     *unicode = result;
     return text;
   }
 }
 static inline unsigned int
 hb_utf_strlen (const uint8_t *text)
 {
   return strlen ((const char *) text);
 }
 /* UTF-16 */
 static inline const uint16_t *
 hb_utf_next (const uint16_t *text,
 	     const uint16_t *end,
 	     hb_codepoint_t *unicode)
 {
   hb_codepoint_t c = *text++;
   if (unlikely (hb_in_range<hb_codepoint_t> (c, 0xd800, 0xdbff)))
   {
     /* high surrogate */
     hb_codepoint_t l;
     if (text < end && ((l = *text), likely (hb_in_range<hb_codepoint_t> (l, 0xdc00, 0xdfff))))
     {
       /* low surrogate */
       *unicode = (c << 10) + l - ((0xd800 << 10) - 0x10000 + 0xdc00);
        text++;
     } else
       *unicode = -1;
   } else
     *unicode = c;
   return text;
 }
 static inline const uint16_t *
 hb_utf_prev (const uint16_t *text,
 	     const uint16_t *start,
 	     hb_codepoint_t *unicode)
 {
   hb_codepoint_t c = *--text;
   if (unlikely (hb_in_range<hb_codepoint_t> (c, 0xdc00, 0xdfff)))
   {
     /* low surrogate */
     hb_codepoint_t h;
     if (start < text && ((h = *(text - 1)), likely (hb_in_range<hb_codepoint_t> (h, 0xd800, 0xdbff))))
     {
       /* high surrogate */
       *unicode = (h << 10) + c - ((0xd800 << 10) - 0x10000 + 0xdc00);
        text--;
     } else
       *unicode = -1;
   } else
     *unicode = c;
   return text;
 }
 static inline unsigned int
 hb_utf_strlen (const uint16_t *text)
 {
   unsigned int l = 0;
   while (*text++) l++;
   return l;
 }
 /* UTF-32 */
 static inline const uint32_t *
 hb_utf_next (const uint32_t *text,
 	     const uint32_t *end HB_UNUSED,
 	     hb_codepoint_t *unicode)
 {
   *unicode = *text++;
   return text;
 }
 static inline const uint32_t *
 hb_utf_prev (const uint32_t *text,
 	     const uint32_t *start HB_UNUSED,
 	     hb_codepoint_t *unicode)
 {
   *unicode = *--text;
   return text;
 }
 static inline unsigned int
 hb_utf_strlen (const uint32_t *text)
 {
   unsigned int l = 0;
   while (*text++) l++;
   return l;
 }
 #endif /* HB_UTF_PRIVATE_HH */

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gfx/harfbuzz/src/hb-utf-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-utf-private.hh