forked from mia/Aegisub
91d73ec8ea
1. cd aegisub/
2. svn mv *cpp *h src/
3. svn mv Makefile.am MatroskaParser.c auto4_perldata.inc bitmaps boost \
changelog.txt config gl include libosxutil libresrc md5.c msvc mythes.cxx \
mythes.hxx res.rc src/
4. cd ..
5. svn mv FFmpegSource2/ INSTALL Makefile.am README acinclude.m4 \
autogen.sh automation/ bin build configure.in desktop dummy.txt lib \
libass/ m4macros/ packages/ po/ scripts/ universalchardet/ aegisub/
6. mkdir -p docs/wiki_convert
7. svn add docs/wiki_convert
8. cd docs
9. svn mv aegisub_convert_docs.pl convert.bat output wiki_convert/
* See r2749 for full description.
Originally committed to SVN as r2752.
281 lines
8 KiB
C++
281 lines
8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Mozilla Universal charset detector code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2001
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Shy Shalom <shooshX@gmail.com>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#include "nscore.h"
|
|
|
|
#include "nsUniversalDetector.h"
|
|
|
|
#include "nsMBCSGroupProber.h"
|
|
#include "nsSBCSGroupProber.h"
|
|
#include "nsEscCharsetProber.h"
|
|
#include "nsLatin1Prober.h"
|
|
#include "nsError.h"
|
|
|
|
nsUniversalDetector::nsUniversalDetector()
|
|
{
|
|
mDone = PR_FALSE;
|
|
mBestGuess = -1; //illegal value as signal
|
|
mInTag = PR_FALSE;
|
|
mEscCharSetProber = nsnull;
|
|
|
|
mStart = PR_TRUE;
|
|
mDetectedCharset = nsnull;
|
|
mGotData = PR_FALSE;
|
|
mInputState = ePureAscii;
|
|
mLastChar = '\0';
|
|
|
|
PRUint32 i;
|
|
for (i = 0; i < NUM_OF_CHARSET_PROBERS; i++)
|
|
mCharSetProbers[i] = nsnull;
|
|
}
|
|
|
|
nsUniversalDetector::~nsUniversalDetector()
|
|
{
|
|
for (PRInt32 i = 0; i < NUM_OF_CHARSET_PROBERS; i++)
|
|
if (mCharSetProbers[i])
|
|
delete mCharSetProbers[i];
|
|
if (mEscCharSetProber)
|
|
delete mEscCharSetProber;
|
|
}
|
|
|
|
void
|
|
nsUniversalDetector::Reset()
|
|
{
|
|
mDone = PR_FALSE;
|
|
mBestGuess = -1; //illegal value as signal
|
|
mInTag = PR_FALSE;
|
|
|
|
mStart = PR_TRUE;
|
|
mDetectedCharset = nsnull;
|
|
mGotData = PR_FALSE;
|
|
mInputState = ePureAscii;
|
|
mLastChar = '\0';
|
|
|
|
if (mEscCharSetProber)
|
|
mEscCharSetProber->Reset();
|
|
|
|
PRUint32 i;
|
|
for (i = 0; i < NUM_OF_CHARSET_PROBERS; i++)
|
|
if (mCharSetProbers[i])
|
|
mCharSetProbers[i]->Reset();
|
|
}
|
|
|
|
//---------------------------------------------------------------------
|
|
#define SHORTCUT_THRESHOLD (float)0.95
|
|
#define MINIMUM_THRESHOLD (float)0.20
|
|
|
|
nsresult nsUniversalDetector::HandleData(const char* aBuf, PRUint32 aLen)
|
|
{
|
|
if(mDone)
|
|
return NS_OK;
|
|
|
|
if (aLen > 0)
|
|
mGotData = PR_TRUE;
|
|
|
|
//If the data starts with BOM, we know it is UTF
|
|
if (mStart)
|
|
{
|
|
mStart = PR_FALSE;
|
|
if (aLen > 3)
|
|
switch (aBuf[0])
|
|
{
|
|
case '\xEF':
|
|
if (('\xBB' == aBuf[1]) && ('\xBF' == aBuf[2]))
|
|
// EF BB BF UTF-8 encoded BOM
|
|
mDetectedCharset = "UTF-8";
|
|
break;
|
|
case '\xFE':
|
|
if (('\xFF' == aBuf[1]) && ('\x00' == aBuf[2]) && ('\x00' == aBuf[3]))
|
|
// FE FF 00 00 UCS-4, unusual octet order BOM (3412)
|
|
mDetectedCharset = "X-ISO-10646-UCS-4-3412";
|
|
else if ('\xFF' == aBuf[1])
|
|
// FE FF UTF-16, big endian BOM
|
|
mDetectedCharset = "UTF-16BE";
|
|
break;
|
|
case '\x00':
|
|
if (('\x00' == aBuf[1]) && ('\xFE' == aBuf[2]) && ('\xFF' == aBuf[3]))
|
|
// 00 00 FE FF UTF-32, big-endian BOM
|
|
mDetectedCharset = "UTF-32BE";
|
|
else if (('\x00' == aBuf[1]) && ('\xFF' == aBuf[2]) && ('\xFE' == aBuf[3]))
|
|
// 00 00 FF FE UCS-4, unusual octet order BOM (2143)
|
|
mDetectedCharset = "X-ISO-10646-UCS-4-2143";
|
|
break;
|
|
case '\xFF':
|
|
if (('\xFE' == aBuf[1]) && ('\x00' == aBuf[2]) && ('\x00' == aBuf[3]))
|
|
// FF FE 00 00 UTF-32, little-endian BOM
|
|
mDetectedCharset = "UTF-32LE";
|
|
else if ('\xFE' == aBuf[1])
|
|
// FF FE UTF-16, little endian BOM
|
|
mDetectedCharset = "UTF-16LE";
|
|
break;
|
|
} // switch
|
|
|
|
if (mDetectedCharset)
|
|
{
|
|
mDone = PR_TRUE;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
PRUint32 i;
|
|
for (i = 0; i < aLen; i++)
|
|
{
|
|
//other than 0xa0, if every othe character is ascii, the page is ascii
|
|
if (aBuf[i] & '\x80' && aBuf[i] != '\xA0') //Since many Ascii only page contains NBSP
|
|
{
|
|
//we got a non-ascii byte (high-byte)
|
|
if (mInputState != eHighbyte)
|
|
{
|
|
//adjust state
|
|
mInputState = eHighbyte;
|
|
|
|
//kill mEscCharSetProber if it is active
|
|
if (mEscCharSetProber) {
|
|
delete mEscCharSetProber;
|
|
mEscCharSetProber = nsnull;
|
|
}
|
|
|
|
//start multibyte and singlebyte charset prober
|
|
if (nsnull == mCharSetProbers[0])
|
|
mCharSetProbers[0] = new nsMBCSGroupProber;
|
|
if (nsnull == mCharSetProbers[1])
|
|
mCharSetProbers[1] = new nsSBCSGroupProber;
|
|
if (nsnull == mCharSetProbers[2])
|
|
mCharSetProbers[2] = new nsLatin1Prober;
|
|
|
|
if ((nsnull == mCharSetProbers[0]) ||
|
|
(nsnull == mCharSetProbers[1]) ||
|
|
(nsnull == mCharSetProbers[2]))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//ok, just pure ascii so far
|
|
if ( ePureAscii == mInputState &&
|
|
(aBuf[i] == '\033' || (aBuf[i] == '{' && mLastChar == '~')) )
|
|
{
|
|
//found escape character or HZ "~{"
|
|
mInputState = eEscAscii;
|
|
}
|
|
mLastChar = aBuf[i];
|
|
}
|
|
}
|
|
|
|
nsProbingState st;
|
|
switch (mInputState)
|
|
{
|
|
case eEscAscii:
|
|
if (nsnull == mEscCharSetProber) {
|
|
mEscCharSetProber = new nsEscCharSetProber;
|
|
if (nsnull == mEscCharSetProber)
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
st = mEscCharSetProber->HandleData(aBuf, aLen);
|
|
if (st == eFoundIt)
|
|
{
|
|
mDone = PR_TRUE;
|
|
mDetectedCharset = mEscCharSetProber->GetCharSetName();
|
|
}
|
|
break;
|
|
case eHighbyte:
|
|
for (i = 0; i < NUM_OF_CHARSET_PROBERS; i++)
|
|
{
|
|
st = mCharSetProbers[i]->HandleData(aBuf, aLen);
|
|
if (st == eFoundIt)
|
|
{
|
|
mDone = PR_TRUE;
|
|
mDetectedCharset = mCharSetProbers[i]->GetCharSetName();
|
|
return NS_OK;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default: //pure ascii
|
|
;//do nothing here
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
void nsUniversalDetector::DataEnd()
|
|
{
|
|
if (!mGotData)
|
|
{
|
|
// we haven't got any data yet, return immediately
|
|
// caller program sometimes call DataEnd before anything has been sent to detector
|
|
return;
|
|
}
|
|
|
|
if (mDetectedCharset)
|
|
{
|
|
mDone = PR_TRUE;
|
|
Report(mDetectedCharset);
|
|
return;
|
|
}
|
|
|
|
switch (mInputState)
|
|
{
|
|
case eHighbyte:
|
|
{
|
|
float proberConfidence;
|
|
float maxProberConfidence = (float)0.0;
|
|
PRInt32 maxProber = 0;
|
|
|
|
for (PRInt32 i = 0; i < NUM_OF_CHARSET_PROBERS; i++)
|
|
{
|
|
proberConfidence = mCharSetProbers[i]->GetConfidence();
|
|
if (proberConfidence > maxProberConfidence)
|
|
{
|
|
maxProberConfidence = proberConfidence;
|
|
maxProber = i;
|
|
}
|
|
}
|
|
//do not report anything because we are not confident of it, that's in fact a negative answer
|
|
if (maxProberConfidence > MINIMUM_THRESHOLD)
|
|
Report(mCharSetProbers[maxProber]->GetCharSetName());
|
|
}
|
|
break;
|
|
case eEscAscii:
|
|
break;
|
|
default:
|
|
;
|
|
}
|
|
return;
|
|
}
|