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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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81
mozilla/xpcom/string/obsolete/nsString2.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
@@ -737,75 +736,23 @@ char* nsString::ToNewCString() const {
* http://www.cis.ohio-state.edu/htbin/rfc/rfc2279.html
*/
char* nsString::ToNewUTF8String() const {
nsCString temp("");
temp.SetCapacity(8); //ensure that we get an allocated buffer instead of the common empty one.
NS_ConvertUCS2toUTF8 temp(mUStr);
// Caculate how many bytes we need
PRUnichar* p;
PRInt32 utf8len;
for(p = this->mUStr, utf8len=0; 0 != (*p);p++)
{
if(0x0000 == ((*p) & 0x007F))
utf8len += 1; // 0000 0000 - 0000 007F
else if(0x0000 == ((*p) & 0x07FF))
utf8len += 2; // 0000 0080 - 0000 07FF
else
utf8len += 3; // 0000 0800 - 0000 FFFF
// Note: Surrogate pair need 4 bytes, but in this caculation
// we count as 6 bytes. It will wast 2 bytes per surrogate pair
char* result;
if (temp.mOwnsBuffer) {
// We allocated. Trick the string into not freeing its buffer to
// avoid an extra allocation.
result = temp.mStr;
temp.mStr=0;
temp.mOwnsBuffer = PR_FALSE;
}
else {
// We didn't allocate a buffer, so we need to copy it out of the
// nsCAutoString's storage.
result = nsCRT::strdup(temp.mStr);
}
if((utf8len+1) > 8)
temp.SetCapacity(utf8len+1);
char* result=temp.mStr;
char* out = result;
PRUint32 ucs4=0;
for(p = this->mUStr, utf8len=0; 0 != (*p);p++)
{
if(0 == ucs4) {
if(0x0000 == ((*p) & 0xFF80)) {
*out++ = (char)*p;
} else if(0x0000 == ((*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
temp.mStr=0;
temp.mOwnsBuffer=PR_FALSE;
return result;
}