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Bug 40461. Implement NS_ConvertUCS2toUTF8, r=scc,brendan

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git-svn-id: svn://10.0.0.236/trunk@70949 18797224-902f-48f8-a5cc-f745e15eee43
This commit is contained in:
waterson%netscape.com
2000-05-26 22:24:34 +00:00
parent 68ae42e908
commit 11ea188ef2
9 changed files with 390 additions and 204 deletions
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89
mozilla/xpcom/string/obsolete/nsString.cpp
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@@ -1,4 +1,3 @@
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
@@ -1862,6 +1861,94 @@ void nsCString::DebugDump(void) const {
}
}
//----------------------------------------------------------------------
NS_ConvertUCS2toUTF8::Init( const PRUnichar* aString, PRUint32 aLength )
{
// Caculate how many bytes we need
const PRUnichar* p;
PRInt32 count, utf8len;
for (p = aString, utf8len = 0, count = aLength; 0 != count && 0 != (*p); count--, p++)
{
if (! ((*p) & 0xFF80))
utf8len += 1; // 0000 0000 - 0000 007F
else if (! ((*p) & 0xF800))
utf8len += 2; // 0000 0080 - 0000 07FF
else
utf8len += 3; // 0000 0800 - 0000 FFFF
// Note: Surrogate pair needs 4 bytes, but in this calcuation
// we count it as 6 bytes. It will waste 2 bytes per surrogate pair
}
// Make sure our buffer's big enough, so we don't need to do
// multiple allocations.
if((utf8len+1) > sizeof(mBuffer))
SetCapacity(utf8len+1);
char* out = mStr;
PRUint32 ucs4=0;
for (p = aString, utf8len=0, count = aLength; 0 != count && 0 != (*p); count--, p++)
{
if (0 == ucs4)
{
if (! ((*p) & 0xFF80))
{
*out++ = (char)*p;
}
else if (! ((*p) & 0xF800))
{
*out++ = 0xC0 | (char)((*p) >> 6);
*out++ = 0x80 | (char)(0x003F & (*p));
}
else
{
if (0xD800 == (0xFC00 & (*p)))
{
// D800- DBFF - High Surrogate
// N = (H- D800) *400 + 10000 + ...
ucs4 = 0x10000 | ((0x03FF & (*p)) << 10);
}
else if (0xDC00 == (0xFC00 & (*p)))
{
// DC00- DFFF - Low Surrogate
// error here. We should hit High Surrogate first
// Do not output any thing in this case
}
else
{
*out++ = 0xE0 | (char)((*p) >> 12);
*out++ = 0x80 | (char)(0x003F & (*p >> 6));
*out++ = 0x80 | (char)(0x003F & (*p) );
}
}
}
else
{
if (0xDC00 == (0xFC00 & (*p)))
{
// DC00- DFFF - Low Surrogate
// N += ( L - DC00 )
ucs4 |= (0x03FF & (*p));
// 0001 0000-001F FFFF
*out++ = 0xF0 | (char)(ucs4 >> 18);
*out++ = 0x80 | (char)(0x003F & (ucs4 >> 12));
*out++ = 0x80 | (char)(0x003F & (ucs4 >> 6));
*out++ = 0x80 | (char)(0x003F & ucs4) ;
}
else
{
// Got a High Surrogate but no low surrogate
// output nothing.
}
ucs4 = 0;
}
}
*out = '\0'; // null terminate
}
/***********************************************************************
IMPLEMENTATION NOTES: AUTOSTRING...