The Tor Browser: comparison gfx/harfbuzz/src/hb-utf-private.hh

--1:000000000000
+:3e5359cd123b
+/*
+* 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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comparison: gfx/harfbuzz/src/hb-utf-private.hh

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