Mercurial > vba-linux

     1 // UTFConvert.cpp

     2 

     3 #include "StdAfx.h"

     4 

     5 #include "UTFConvert.h"

     6 #include "Types.h"

     7 

     8 static const Byte kUtf8Limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };

     9 

    10 static Bool Utf8_To_Utf16(wchar_t *dest, size_t *destLen, const char *src, size_t srcLen)

    11 {

    12   size_t destPos = 0, srcPos = 0;

    13   for (;;)

    14   {

    15     Byte c;

    16     int numAdds;

    17     if (srcPos == srcLen)

    18     {

    19       *destLen = destPos;

    20       return True;

    21     }

    22     c = (Byte)src[srcPos++];

    23 

    24     if (c < 0x80)

    25     {

    26       if (dest)

    27         dest[destPos] = (wchar_t)c;

    28       destPos++;

    29       continue;

    30     }

    31     if (c < 0xC0)

    32       break;

    33     for (numAdds = 1; numAdds < 5; numAdds++)

    34       if (c < kUtf8Limits[numAdds])

    35         break;

    36     UInt32 value = (c - kUtf8Limits[numAdds - 1]);

    37 

    38     do

    39     {

    40       Byte c2;

    41       if (srcPos == srcLen)

    42         break;

    43       c2 = (Byte)src[srcPos++];

    44       if (c2 < 0x80 || c2 >= 0xC0)

    45         break;

    46       value <<= 6;

    47       value |= (c2 - 0x80);

    48     }

    49     while (--numAdds != 0);

    50     

    51     if (value < 0x10000)

    52     {

    53       if (dest)

    54         dest[destPos] = (wchar_t)value;

    55       destPos++;

    56     }

    57     else

    58     {

    59       value -= 0x10000;

    60       if (value >= 0x100000)

    61         break;

    62       if (dest)

    63       {

    64         dest[destPos + 0] = (wchar_t)(0xD800 + (value >> 10));

    65         dest[destPos + 1] = (wchar_t)(0xDC00 + (value & 0x3FF));

    66       }

    67       destPos += 2;

    68     }

    69   }

    70   *destLen = destPos;

    71   return False;

    72 }

    73 

    74 static Bool Utf16_To_Utf8(char *dest, size_t *destLen, const wchar_t *src, size_t srcLen)

    75 {

    76   size_t destPos = 0, srcPos = 0;

    77   for (;;)

    78   {

    79     unsigned numAdds;

    80     UInt32 value;

    81     if (srcPos == srcLen)

    82     {

    83       *destLen = destPos;

    84       return True;

    85     }

    86     value = src[srcPos++];

    87     if (value < 0x80)

    88     {

    89       if (dest)

    90         dest[destPos] = (char)value;

    91       destPos++;

    92       continue;

    93     }

    94     if (value >= 0xD800 && value < 0xE000)

    95     {

    96       UInt32 c2;

    97       if (value >= 0xDC00 || srcPos == srcLen)

    98         break;

    99       c2 = src[srcPos++];

   100       if (c2 < 0xDC00 || c2 >= 0xE000)

   101         break;

   102       value = ((value - 0xD800) << 10) | (c2 - 0xDC00);

   103     }

   104     for (numAdds = 1; numAdds < 5; numAdds++)

   105       if (value < (((UInt32)1) << (numAdds * 5 + 6)))

   106         break;

   107     if (dest)

   108       dest[destPos] = (char)(kUtf8Limits[numAdds - 1] + (value >> (6 * numAdds)));

   109     destPos++;

   110     do

   111     {

   112       numAdds--;

   113       if (dest)

   114         dest[destPos] = (char)(0x80 + ((value >> (6 * numAdds)) & 0x3F));

   115       destPos++;

   116     }

   117     while (numAdds != 0);

   118   }

   119   *destLen = destPos;

   120   return False;

   121 }

   122 

   123 bool ConvertUTF8ToUnicode(const AString &src, UString &dest)

   124 {

   125   dest.Empty();

   126   size_t destLen = 0;

   127   Utf8_To_Utf16(NULL, &destLen, src, src.Length());

   128   wchar_t *p = dest.GetBuffer((int)destLen);

   129   Bool res = Utf8_To_Utf16(p, &destLen, src, src.Length());

   130   p[destLen] = 0;

   131   dest.ReleaseBuffer();

   132   return res ? true : false;

   133 }

   134 

   135 bool ConvertUnicodeToUTF8(const UString &src, AString &dest)

   136 {

   137   dest.Empty();

   138   size_t destLen = 0;

   139   Utf16_To_Utf8(NULL, &destLen, src, src.Length());

   140   char *p = dest.GetBuffer((int)destLen);

   141   Bool res = Utf16_To_Utf8(p, &destLen, src, src.Length());

   142   p[destLen] = 0;

   143   dest.ReleaseBuffer();

   144   return res ? true : false;

   145 }
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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