Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/gfx/graphite2/src/inc/UtfCodec.h b/gfx/graphite2/src/inc/UtfCodec.h
new file mode 100644
index 0000000000..24a343d8d9
--- /dev/null
+++ b/gfx/graphite2/src/inc/UtfCodec.h
@@ -0,0 +1,251 @@
+/*  GRAPHITE2 LICENSING
+
+    Copyright 2011, SIL International
+    All rights reserved.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should also have received a copy of the GNU Lesser General Public
+    License along with this library in the file named "LICENSE".
+    If not, write to the Free Software Foundation, 51 Franklin Street,
+    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+    internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#pragma once
+
+#include <cstdlib>
+#include "inc/Main.h"
+
+namespace graphite2 {
+
+typedef uint32  uchar_t;
+
+template <int N>
+struct _utf_codec
+{
+    typedef uchar_t codeunit_t;
+
+    static void     put(codeunit_t * cp, const uchar_t , int8 & len) throw();
+    static uchar_t  get(const codeunit_t * cp, int8 & len) throw();
+    static bool     validate(const codeunit_t * s, const codeunit_t * const e) throw();
+};
+
+
+template <>
+struct _utf_codec<32>
+{
+private:
+    static const uchar_t    limit = 0x110000;
+public:
+    typedef uint32  codeunit_t;
+
+    inline
+    static void put(codeunit_t * cp, const uchar_t usv, int8 & l) throw()
+    {
+        *cp = usv; l = 1;
+    }
+
+    inline
+    static uchar_t get(const codeunit_t * cp, int8 & l) throw()
+    {
+        if (cp[0] < limit)  { l = 1;  return cp[0]; }
+        else                { l = -1; return 0xFFFD; }
+    }
+
+    inline
+    static bool validate(const codeunit_t * s, const codeunit_t * const e) throw()
+    {
+        return s <= e;
+    }
+};
+
+
+template <>
+struct _utf_codec<16>
+{
+private:
+    static const int32  lead_offset      = 0xD800 - (0x10000 >> 10);
+    static const int32  surrogate_offset = 0x10000 - (0xD800 << 10) - 0xDC00;
+public:
+    typedef uint16  codeunit_t;
+
+    inline
+    static void put(codeunit_t * cp, const uchar_t usv, int8 & l) throw()
+    {
+        if (usv < 0x10000)  { l = 1; cp[0] = codeunit_t(usv); }
+        else
+        {
+            cp[0] = codeunit_t(lead_offset + (usv >> 10));
+            cp[1] = codeunit_t(0xDC00 + (usv & 0x3FF));
+            l = 2;
+        }
+    }
+
+    inline
+    static uchar_t get(const codeunit_t * cp, int8 & l) throw()
+    {
+        const uint32    uh = cp[0];
+        l = 1;
+
+        if (uh < 0xD800|| uh > 0xDFFF) { return uh; }
+        if (uh > 0xDBFF) { l = -1; return 0xFFFD; }
+        const uint32 ul = cp[1];
+        if (ul < 0xDC00 || ul > 0xDFFF) { l = -1; return 0xFFFD; }
+        ++l;
+        return (uh<<10) + ul + surrogate_offset;
+    }
+
+    inline
+    static bool validate(const codeunit_t * s, const codeunit_t * const e) throw()
+    {
+        const ptrdiff_t n = e-s;
+        if (n <= 0) return n == 0;
+        const uint32 u = *(e-1); // Get the last codepoint
+        return (u < 0xD800 || u > 0xDBFF);
+    }
+};
+
+
+template <>
+struct _utf_codec<8>
+{
+private:
+    static const int8 sz_lut[16];
+    static const byte mask_lut[5];
+    static const uchar_t    limit = 0x110000;
+
+public:
+    typedef uint8   codeunit_t;
+
+    inline
+    static void put(codeunit_t * cp, const uchar_t usv, int8 & l) throw()
+    {
+        if (usv < 0x80)     {l = 1; cp[0] = usv; return; }
+        if (usv < 0x0800)   {l = 2; cp[0] = 0xC0 + (usv >> 6);  cp[1] = 0x80 + (usv & 0x3F); return; }
+        if (usv < 0x10000)  {l = 3; cp[0] = 0xE0 + (usv >> 12); cp[1] = 0x80 + ((usv >> 6) & 0x3F);  cp[2] = 0x80 + (usv & 0x3F); return; }
+        else                {l = 4; cp[0] = 0xF0 + (usv >> 18); cp[1] = 0x80 + ((usv >> 12) & 0x3F); cp[2] = 0x80 + ((usv >> 6) & 0x3F); cp[3] = 0x80 + (usv & 0x3F); return; }
+    }
+
+    inline
+    static uchar_t get(const codeunit_t * cp, int8 & l) throw()
+    {
+        const int8 seq_sz = sz_lut[*cp >> 4];
+        uchar_t u = *cp & mask_lut[seq_sz];
+        l = 1;
+        bool toolong = false;
+
+        switch(seq_sz) {
+            case 4:     u <<= 6; u |= *++cp & 0x3F; if (*cp >> 6 != 2) break; ++l; toolong  = (u < 0x10); GR_FALLTHROUGH;
+                // no break
+            case 3:     u <<= 6; u |= *++cp & 0x3F; if (*cp >> 6 != 2) break; ++l; toolong |= (u < 0x20); GR_FALLTHROUGH;
+                // no break
+            case 2:     u <<= 6; u |= *++cp & 0x3F; if (*cp >> 6 != 2) break; ++l; toolong |= (u < 0x80); GR_FALLTHROUGH;
+                // no break
+            case 1:     break;
+            case 0:     l = -1; return 0xFFFD;
+        }
+
+        if (l != seq_sz || toolong  || u >= limit)
+        {
+            l = -l;
+            return 0xFFFD;
+        }
+        return u;
+    }
+
+    inline
+    static bool validate(const codeunit_t * s, const codeunit_t * const e) throw()
+    {
+        const ptrdiff_t n = e-s;
+        if (n <= 0) return n == 0;
+        s += (n-1);
+        if (*s < 0x80) return true;
+        if (*s >= 0xC0) return false;
+        if (n == 1) return true;
+        if (*--s < 0x80) return true;
+        if (*s >= 0xE0) return false;
+        if (n == 2 || *s >= 0xC0) return true;
+        if (*--s < 0x80) return true;
+        if (*s >= 0xF0) return false;
+        return true;
+    }
+
+};
+
+
+template <typename C>
+class _utf_iterator
+{
+    typedef _utf_codec<sizeof(C)*8> codec;
+
+    C             * cp;
+    mutable int8    sl;
+
+public:
+    typedef C           codeunit_type;
+    typedef uchar_t     value_type;
+    typedef uchar_t   * pointer;
+
+    class reference
+    {
+        const _utf_iterator & _i;
+
+        reference(const _utf_iterator & i): _i(i) {}
+    public:
+        operator value_type () const throw ()                   { return codec::get(_i.cp, _i.sl); }
+        reference & operator = (const value_type usv) throw()   { codec::put(_i.cp, usv, _i.sl); return *this; }
+
+        friend class _utf_iterator;
+    };
+
+
+    _utf_iterator(const void * us=0)    : cp(reinterpret_cast<C *>(const_cast<void *>(us))), sl(1) { }
+
+    _utf_iterator   & operator ++ ()    { cp += abs(sl); return *this; }
+    _utf_iterator   operator ++ (int)   { _utf_iterator tmp(*this); operator++(); return tmp; }
+
+    bool operator == (const _utf_iterator & rhs) const throw() { return cp >= rhs.cp; }
+    bool operator != (const _utf_iterator & rhs) const throw() { return !operator==(rhs); }
+
+    reference   operator * () const throw() { return *this; }
+    pointer     operator ->() const throw() { return &operator *(); }
+
+    operator codeunit_type * () const throw() { return cp; }
+
+    bool error() const throw()  { return sl < 1; }
+    bool validate(const _utf_iterator & e)  { return codec::validate(cp, e.cp); }
+};
+
+template <typename C>
+struct utf
+{
+    typedef typename _utf_codec<sizeof(C)*8>::codeunit_t codeunit_t;
+
+    typedef _utf_iterator<C>        iterator;
+    typedef _utf_iterator<const C>  const_iterator;
+
+    inline
+    static bool validate(codeunit_t * s, codeunit_t * e) throw() {
+        return _utf_codec<sizeof(C)*8>::validate(s,e);
+    }
+};
+
+
+typedef utf<uint32> utf32;
+typedef utf<uint16> utf16;
+typedef utf<uint8>  utf8;
+
+} // namespace graphite2