BinURLInputStream.cpp
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上传日期:2007-01-10
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文件大小:12k
源码类别:
xml/soap/webservice
开发平台:
C/C++
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2000 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: BinURLInputStream.cpp,v $
- * Revision 1.6 2001/11/28 19:14:59 knoaman
- * Bug 2238: fix by Artur Klauser
- * Some broken proxy servers (e.g. the one behind which I happen to reside,
- * which apparently is Server: Microsoft-IIS/5.0)
- * implement wrong boundary conditions for range requests. In particular,
- * (1) request ranges straddling the content length of the document
- * give bogus header information
- * Content-Range: bytes X-Y/Z
- * where Y > Z, and give 0 bytes of actual message content.
- * (2) request ranges beyond the content length of the document do not
- * give an error response as asked for in RFC2616 (http/1.1)
- *
- * Since the NetAccessor code was just trying to fall off the end of the
- * document with the last range request (ie. hitting case 1 above), it
- * never gets the last chunk of data from this proxy server.
- *
- * Revision 1.5 2001/11/28 19:11:33 knoaman
- * Bug 2237: fix by Artur Klauser
- *
- * Revision 1.4 2001/03/02 14:39:21 tng
- * Enabling libWWW NetAccessor support under UNIX. Tested with latest tarball of libWWW
- * (w3c-libwww-5.3.2) under RedHat Linux 6.1. Added by Martin Kalen.
- *
- * There is one MAJOR problem with the use of libwww and the patches
- * below, which someone with knowledge of libwww filters etc. might want
- * to look into. Default behavior for content-type text/xml is to consume
- * all xml data before it reaches the simple HTML presenter. Hence, only
- * files with content-type text/html will actually reach the xerces-c
- * library. If you have a *.xml file on the webbserver, processing of the
- * file will throw an exception stating "The main XML document cannot be
- * empty" (correct in a xerces point of view since if you enable debug
- * build you will see that libwww "eats" all text/xml).
- *
- * See "Diffs for enabling libWWW NetAccessor support under UNIX" posted in March 1, 2001
- * in the xerces-c-dev mailing list for further information.
- *
- * Revision 1.3 2000/05/15 22:31:31 andyh
- * Replace #include<memory.h> with <string.h> everywhere.
- *
- * Revision 1.2 2000/02/26 07:56:36 rahulj
- * Fixed the license header as pointed out by Bill Schindler <developer@bitranch.com>
- *
- * Revision 1.1 2000/02/17 22:06:19 rahulj
- * Moved the four LibWWW files to its own sub-directory in the
- * NetAccessor directory.
- *
- *
- * Revision 1.1 2000/01/15 01:08:04 rahulj
- * Added support for HTTP to the parser.
- * Error handling is not very good. Also cannot guarantee that
- * there are no memory leaks.
- * Only tested under NT 4.0 SP 5 using libWWW 5.2.8.
- *
- */
- #include <util/XMLNetAccessor.hpp>
- #include <util/NetAccessors/libWWW/BinURLInputStream.hpp>
- #include <util/XMLString.hpp>
- #include <util/XMLExceptMsgs.hpp>
- #include <strings.h>
- #include <WWWInit.h>
- //
- // This define specifies the size of the buffer used to read chunks
- // out of the URL input stream.
- //
- #define URLISBUFMAXSIZE 8192
- //
- // We assume here that the URL is essentially composed of just ASCII characters
- // and hence converting it to a 'char *' requires just to drop the leading zero
- // byte. The reason, we can get away with this is that libWWW currently provides
- // no wide character API's.
- //
- // The input Unicode string is assumed to be 0 terminated.
- // The caller is responsible to free the memory allocated to store the resultant
- // 'char *' string.
- //
- static char* localTranscode(const XMLCh* latinStrInUnicode)
- {
- unsigned int lent = XMLString::stringLen(latinStrInUnicode);
- char* retval = new char[lent + 1];
- unsigned int i = 0;
- for (i = 0; i < lent; i++)
- retval[i] = (char) latinStrInUnicode[i]; // drop the leading byte.
- retval[lent] = 0;
- return retval;
- }
- BinURLInputStream::BinURLInputStream(const XMLURL& urlSource)
- : fBuffer(0)
- , fBufferSize(0)
- , fBufferIndex(0)
- , fRemoteFileSize(0)
- , fAnchor(0)
- , fBytesProcessed(0)
- {
- fBuffer = new XMLByte[URLISBUFMAXSIZE];
- const XMLCh* uri = urlSource.getURLText();
- char* uriAsCharStar = localTranscode(uri);
- //
- // First find the size of the remote resource being asked for.
- // We use the ContentCounter stream provided by libWWW.
- //
- fAnchor = HTAnchor_findAddress(uriAsCharStar);
- HTRequest* request = HTRequest_new();
- HTRequest_setOutputFormat(request, WWW_SOURCE);
- HTStream* counterStrm = HTContentCounter(HTBlackHole(), request, 0xFFFF);
- BOOL status = HTLoadToStream(uriAsCharStar, counterStrm, request);
- if (status == YES)
- {
- // Patch by Artur Klauser
- // When a redirection is processed in libWWW, it seems that
- // HTAnchor_length(anchor) == -1 on the original anchor, whereas
- // HTResponse_length(response) gives the correct content length of
- // the redirection target. This has confusedfRemoteFileSize and it was
- // not checked for a -1 response at all.
- HTResponse * response = HTRequest_response (request);
- fRemoteFileSize = HTResponse_length(response);
- if (fRemoteFileSize < 0) {
- ThrowXML1(NetAccessorException, XMLExcepts::NetAcc_InternalError,
- "Cannot determine length of remote file.");
- }
- }
- // Cleanup, before you throw any errors.
- delete [] uriAsCharStar;
- HTRequest_delete(request);
- // Don't know whether I am supposed to delete counterStrm.
- if (status == NO)
- {
- ThrowXML1(NetAccessorException, XMLExcepts::NetAcc_InternalError,
- "Cannot determine length of remote file.");
- }
- }
- BinURLInputStream::~BinURLInputStream()
- {
- delete [] fBuffer;
- fBuffer = 0;
- // Do not delete the fAnchor. Its deleted when the destructor of
- // libWWWNetAccessor is called.
- }
- void BinURLInputStream::reset()
- {
- fBufferSize = 0;
- fBytesProcessed = 0;
- fBufferIndex = 0;
- memset((void*) fBuffer, 0x00, sizeof(XMLByte) * URLISBUFMAXSIZE);
- }
- unsigned int BinURLInputStream::curPos() const
- {
- return fBytesProcessed;
- }
- unsigned int BinURLInputStream::bytesAvail() const
- {
- unsigned int retval = fBufferSize - fBufferIndex;
- return retval;
- }
- unsigned int BinURLInputStream::readBytes(XMLByte* const toFill
- , const unsigned int maxToRead)
- {
- unsigned int retval = 0;
- unsigned int bytesAsked = maxToRead;
- unsigned int bytesForCopy = 0;
- // Wipe out the old stuff from the destination buffer to fill.
- memset((void*)toFill, 0x00, sizeof(XMLByte) * maxToRead);
- // You can only read till the end of the remote resource file.
- // So, adjust the count of bytes you want to read now.
- if (fBytesProcessed + bytesAsked >= fRemoteFileSize)
- {
- bytesAsked = fRemoteFileSize - fBytesProcessed;
- }
- if (fBufferSize > 0)
- bytesForCopy = fBufferSize - fBufferIndex;
- if (bytesAsked <= bytesForCopy)
- {
- // ...then you can satisfy this request completely from fBuffer.
- // Simply copy over the bytes to the destination array.
- memcpy((void*) toFill, (void*) (fBuffer + fBufferIndex), bytesAsked);
- fBufferIndex += bytesAsked;
- if (fBufferIndex >= fBufferSize)
- {
- fBufferSize = 0;
- fBufferIndex = 0;
- }
- fBytesProcessed += bytesAsked;
- retval = bytesAsked;
- }
- else
- {
- // ...will need to read some more bytes out of the stream.
- unsigned int bufToFillIndex = 0;
- HTRequest* request = HTRequest_new();
- HTChunk* result = NULL;
- char ranges[64];
- // First copy over what is left in fBuffer, before reading another
- // chunk out of the stream.
- if (bytesForCopy != 0)
- {
- memcpy((void*) toFill, (void*) (fBuffer + fBufferSize), bytesForCopy);
- fBufferSize = 0;
- fBufferIndex = 0;
- fBytesProcessed += bytesForCopy;
- bufToFillIndex = bytesForCopy;
- retval = bytesForCopy;
- }
- unsigned int bytesRemainingForCopy = bytesAsked - bytesForCopy;
- // Now read a new chunk from the stream. HTTP lets you specify the
- // range of bytes that you would like.
- sprintf(ranges, "%ld-%ld", fBytesProcessed,
- MIN(fBytesProcessed + URLISBUFMAXSIZE - 1, fRemoteFileSize - 1));
- HTRequest_addRange(request, "bytes", ranges);
- HTRequest_setOutputFormat(request, WWW_SOURCE);
- result = HTLoadAnchorToChunk(fAnchor, request);
- fBufferSize = HTChunk_size(result);
- if (fBufferSize > 0)
- {
- // Store the read chunk in fBuffer.
- memset((void*) fBuffer, 0x00, URLISBUFMAXSIZE);
- memcpy((void*) fBuffer, (void*) HTChunk_data(result), fBufferSize);
- fBufferIndex = 0;
- }
- HTRequest_delete(request);
- HTChunk_delete(result);
- // Now fill the destination buffer with the new data just read.
- bytesForCopy = fBufferSize;
- if (bytesRemainingForCopy > fBufferSize)
- {
- bytesRemainingForCopy = fBufferSize;
- }
- memcpy((void*) (toFill + bufToFillIndex),
- (void*) fBuffer,
- bytesRemainingForCopy);
- // Update counters.
- retval += bytesRemainingForCopy;
- fBufferIndex += bytesRemainingForCopy;
- fBytesProcessed += bytesRemainingForCopy;
- }
- return retval;
- }