| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 1999 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xerces" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache\@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation, and was |
| * originally based on software copyright (c) 1999, International |
| * Business Machines, Inc., http://www.ibm.com . For more information |
| * on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| /** |
| * $Log$ |
| * Revision 1.1 1999/11/09 01:08:37 twl |
| * Initial revision |
| * |
| * Revision 1.2 1999/11/08 20:44:40 rahul |
| * Swat for adding in Product name and CVS comment log variable. |
| * |
| */ |
| |
| |
| // --------------------------------------------------------------------------- |
| // Includes |
| // --------------------------------------------------------------------------- |
| #include <util/RuntimeException.hpp> |
| #include <util/XMLString.hpp> |
| #include <util/XMLUni.hpp> |
| #include <framework/XMLRecognizer.hpp> |
| #include <memory.h> |
| #include <string.h> |
| |
| |
| // --------------------------------------------------------------------------- |
| // Local data |
| // |
| // gEncodingNameMap |
| // This array maps the Encodings enum values to their canonical names. |
| // Be sure to keep this in sync with that enum! |
| // |
| // gEBCDICPre |
| // The byte sequence prefix for a legal EBCDIC encoded file. This tells |
| // enough to let us read the XMLDecl in EBCDIC and get the real encoding |
| // string out. |
| // |
| // gUCS4XXX |
| // The byte sequence prefixes for a legal UCS encoded file. If we get |
| // one of these, we can read the decl line in UCS and get the actual |
| // encoding. |
| // |
| // gUTF16XXX |
| // These are the byte sequences that a legal UTF-16 (without BOM) file |
| // can start with. The BOM is checked for, but if not found we still |
| // will try for this sequence. Once we hit one of these, we can read |
| // the first line in UTF-6 and get the real encoding out. |
| // --------------------------------------------------------------------------- |
| static const XMLCh* gEncodingNameMap[XMLRecognizer::Encodings_Count] = |
| { |
| XMLUni::fgEBCDICEncodingString |
| , XMLUni::fgUCS4BEncodingString |
| , XMLUni::fgUCS4LEncodingString |
| , XMLUni::fgUSASCIIEncodingString |
| , XMLUni::fgUTF8EncodingString |
| , XMLUni::fgUTF16BEncodingString |
| , XMLUni::fgUTF16LEncodingString |
| }; |
| static const XMLByte gEBCDICPre[] = { 0x4C, 0x6F, 0xA7, 0x94, 0x93, 0x40 }; |
| static const XMLByte gUCS4BPre[] = { 0x00, 0x00, 0x00, 0x3C }; |
| static const XMLByte gUCS4LPre[] = { 0x3C, 0x00, 0x00, 0x00 }; |
| static const XMLByte gUTF16BPre[] = { 0x00, 0x3C, 0x00, 0x3F }; |
| static const XMLByte gUTF16LPre[] = { 0x3C, 0x00, 0x3F, 0x00 }; |
| static const char gXMLDecl_ASCII[]= { 0x3C, 0x3F, 0x78, 0x6D, 0x6C }; |
| |
| |
| |
| |
| // --------------------------------------------------------------------------- |
| // XMLRecognizer: Encoding recognition methods |
| // --------------------------------------------------------------------------- |
| XMLRecognizer::Encodings |
| XMLRecognizer::basicEncodingProbe( const XMLByte* const rawBuffer |
| , const unsigned int rawByteCount) |
| { |
| // |
| // As an optimization to check the 90% case, check first for the ASCII |
| // sequence '<?xml', which means its either US-ASCII, UTF-8, or some |
| // other encoding that we don't do manually but which happens to share |
| // the US-ASCII code points for these characters. So just return UTF-8 |
| // to get us through the first line. |
| // |
| if (rawByteCount > 5) |
| { |
| if (!memcmp(rawBuffer, gXMLDecl_ASCII, 5)) |
| return UTF_8; |
| } |
| |
| // |
| // If the count of raw bytes is less than 2, it cannot be anything |
| // we understand, so return UTF-8 as a fallback. |
| // |
| if (rawByteCount < 2) |
| return UTF_8; |
| |
| // |
| // We know its at least two bytes, so lets check for a UTF-16 BOM. That |
| // is quick to check and enough to identify two major encodings. |
| // |
| if ((rawBuffer[0] == 0xFE) && (rawBuffer[1] == 0xFF)) |
| return UTF_16B; |
| else if ((rawBuffer[0] == 0xFF) && (rawBuffer[1] == 0xFE)) |
| return UTF_16L; |
| |
| // |
| // Oh well, not one of those. So now lets see if we have at least 4 |
| // bytes. If not, then we are out of ideas and can return UTF-8 as the |
| // fallback. |
| // |
| if (rawByteCount < 4) |
| return UTF_8; |
| |
| // |
| // We have at least 4 bytes. So lets check the 4 byte sequences that |
| // indicate other UTF-16 and UCS encodings. |
| // |
| if ((rawBuffer[0] == 0x00) || (rawBuffer[0] == 0x3C)) |
| { |
| if (!memcmp(rawBuffer, gUCS4BPre, 4)) |
| return UCS_4B; |
| else if (!memcmp(rawBuffer, gUCS4LPre, 4)) |
| return UCS_4L; |
| else if (!memcmp(rawBuffer, gUTF16BPre, 4)) |
| return UTF_16B; |
| else if (!memcmp(rawBuffer, gUTF16LPre, 4)) |
| return UTF_16L; |
| } |
| |
| // |
| // See if we have enough bytes to possibly match the EBCDIC prefix. |
| // If so, try it. |
| // |
| if (rawByteCount > 5) |
| { |
| if (!memcmp(rawBuffer, gEBCDICPre, 5)) |
| return EBCDIC; |
| } |
| |
| // |
| // Does not seem to be anything we know, so go with UTF-8 to get at |
| // least through the first line and see what it really is. |
| // |
| return UTF_8; |
| } |
| |
| |
| XMLRecognizer::Encodings |
| XMLRecognizer::encodingForName(const XMLCh* const encName) |
| { |
| // |
| // Compare the passed string, case insensitively, to the variations |
| // that we recognize. |
| // |
| // !!NOTE: Note that we don't handle EBCDIC here because we don't handle |
| // that one ourselves. It is allowed to fall into 'other'. |
| // |
| if (!XMLString::compareIString(encName, XMLUni::fgUTF8EncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUTF8EncodingString2)) |
| { |
| return XMLRecognizer::UTF_8; |
| } |
| else if (!XMLString::compareIString(encName, XMLUni::fgUSASCIIEncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUSASCIIEncodingString2) |
| || !XMLString::compareIString(encName, XMLUni::fgUSASCIIEncodingString3) |
| || !XMLString::compareIString(encName, XMLUni::fgUSASCIIEncodingString4)) |
| { |
| return XMLRecognizer::US_ASCII; |
| } |
| else if (!XMLString::compareIString(encName, XMLUni::fgUTF16LEncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUTF16LEncodingString2)) |
| { |
| return XMLRecognizer::UTF_16L; |
| } |
| else if (!XMLString::compareIString(encName, XMLUni::fgUTF16BEncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUTF16BEncodingString2)) |
| { |
| return XMLRecognizer::UTF_16B; |
| } |
| else if (!XMLString::compareIString(encName, XMLUni::fgUCS4LEncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUCS4LEncodingString2)) |
| { |
| return XMLRecognizer::UCS_4L; |
| } |
| else if (!XMLString::compareIString(encName, XMLUni::fgUCS4BEncodingString) |
| || !XMLString::compareIString(encName, XMLUni::fgUCS4BEncodingString2)) |
| { |
| return XMLRecognizer::UCS_4B; |
| } |
| |
| // Return 'other' since we don't recognizer it |
| return XMLRecognizer::OtherEncoding; |
| } |
| |
| |
| const XMLCh* |
| XMLRecognizer::nameForEncoding(const XMLRecognizer::Encodings theEncoding) |
| { |
| if (theEncoding > Encodings_Count) |
| ThrowXML(RuntimeException, XML4CExcepts::XMLRec_UnknownEncoding); |
| |
| return gEncodingNameMap[theEncoding]; |
| } |
