xmlio.c

xml开源解析代码.版本为libxml2-2.6.29,可支持GB3212.网络消息发送XML时很有用.

}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlRegisterDefaultInputCallbacks:
 *
 * Registers the default compiled-in I/O handlers.
 */
void
xmlRegisterDefaultInputCallbacks(void) {
    if (xmlInputCallbackInitialized)
	return;

#if defined(_WIN32) || defined (__DJGPP__) && !defined (__CYGWIN__)
    xmlInitPlatformSpecificIo();
#endif

    xmlRegisterInputCallbacks(xmlFileMatch, xmlFileOpen,
	                      xmlFileRead, xmlFileClose);
#ifdef HAVE_ZLIB_H
    xmlRegisterInputCallbacks(xmlGzfileMatch, xmlGzfileOpen,
	                      xmlGzfileRead, xmlGzfileClose);
#endif /* HAVE_ZLIB_H */

#ifdef LIBXML_HTTP_ENABLED
    xmlRegisterInputCallbacks(xmlIOHTTPMatch, xmlIOHTTPOpen,
	                      xmlIOHTTPRead, xmlIOHTTPClose);
#endif /* LIBXML_HTTP_ENABLED */

#ifdef LIBXML_FTP_ENABLED
    xmlRegisterInputCallbacks(xmlIOFTPMatch, xmlIOFTPOpen,
	                      xmlIOFTPRead, xmlIOFTPClose);
#endif /* LIBXML_FTP_ENABLED */
    xmlInputCallbackInitialized = 1;
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlRegisterDefaultOutputCallbacks:
 *
 * Registers the default compiled-in I/O handlers.
 */
void
xmlRegisterDefaultOutputCallbacks (void) {
    if (xmlOutputCallbackInitialized)
	return;

#if defined(_WIN32) || defined (__DJGPP__) && !defined (__CYGWIN__)
    xmlInitPlatformSpecificIo();
#endif

    xmlRegisterOutputCallbacks(xmlFileMatch, xmlFileOpenW,
	                      xmlFileWrite, xmlFileClose);

#ifdef LIBXML_HTTP_ENABLED
    xmlRegisterOutputCallbacks(xmlIOHTTPMatch, xmlIOHTTPDfltOpenW,
	                       xmlIOHTTPWrite, xmlIOHTTPClosePut);
#endif

/*********************************
 No way a-priori to distinguish between gzipped files from
 uncompressed ones except opening if existing then closing
 and saving with same compression ratio ... a pain.

#ifdef HAVE_ZLIB_H
    xmlRegisterOutputCallbacks(xmlGzfileMatch, xmlGzfileOpen,
	                       xmlGzfileWrite, xmlGzfileClose);
#endif

 Nor FTP PUT ....
#ifdef LIBXML_FTP_ENABLED
    xmlRegisterOutputCallbacks(xmlIOFTPMatch, xmlIOFTPOpen,
	                       xmlIOFTPWrite, xmlIOFTPClose);
#endif
 **********************************/
    xmlOutputCallbackInitialized = 1;
}

#ifdef LIBXML_HTTP_ENABLED
/**
 * xmlRegisterHTTPPostCallbacks:
 *
 * By default, libxml submits HTTP output requests using the "PUT" method.
 * Calling this method changes the HTTP output method to use the "POST"
 * method instead.
 *
 */
void
xmlRegisterHTTPPostCallbacks( void ) {

    /*  Register defaults if not done previously  */

    if ( xmlOutputCallbackInitialized == 0 )
	xmlRegisterDefaultOutputCallbacks( );

    xmlRegisterOutputCallbacks(xmlIOHTTPMatch, xmlIOHTTPDfltOpenW,
	                       xmlIOHTTPWrite, xmlIOHTTPClosePost);
    return;
}
#endif
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlAllocParserInputBuffer:
 * @enc:  the charset encoding if known
 *
 * Create a buffered parser input for progressive parsing
 *
 * Returns the new parser input or NULL
 */
xmlParserInputBufferPtr
xmlAllocParserInputBuffer(xmlCharEncoding enc) {
    xmlParserInputBufferPtr ret;

    ret = (xmlParserInputBufferPtr) xmlMalloc(sizeof(xmlParserInputBuffer));
    if (ret == NULL) {
	xmlIOErrMemory("creating input buffer");
	return(NULL);
    }
    memset(ret, 0, (size_t) sizeof(xmlParserInputBuffer));
    ret->buffer = xmlBufferCreateSize(2 * xmlDefaultBufferSize);
    if (ret->buffer == NULL) {
        xmlFree(ret);
	return(NULL);
    }
    ret->buffer->alloc = XML_BUFFER_ALLOC_DOUBLEIT;
    ret->encoder = xmlGetCharEncodingHandler(enc);
    if (ret->encoder != NULL)
        ret->raw = xmlBufferCreateSize(2 * xmlDefaultBufferSize);
    else
        ret->raw = NULL;
    ret->readcallback = NULL;
    ret->closecallback = NULL;
    ret->context = NULL;
    ret->compressed = -1;
    ret->rawconsumed = 0;

    return(ret);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlAllocOutputBuffer:
 * @encoder:  the encoding converter or NULL
 *
 * Create a buffered parser output
 *
 * Returns the new parser output or NULL
 */
xmlOutputBufferPtr
xmlAllocOutputBuffer(xmlCharEncodingHandlerPtr encoder) {
    xmlOutputBufferPtr ret;

    ret = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));
    if (ret == NULL) {
	xmlIOErrMemory("creating output buffer");
	return(NULL);
    }
    memset(ret, 0, (size_t) sizeof(xmlOutputBuffer));
    ret->buffer = xmlBufferCreate();
    if (ret->buffer == NULL) {
        xmlFree(ret);
	return(NULL);
    }
    ret->buffer->alloc = XML_BUFFER_ALLOC_DOUBLEIT;
    ret->encoder = encoder;
    if (encoder != NULL) {
        ret->conv = xmlBufferCreateSize(4000);
	/*
	 * This call is designed to initiate the encoder state
	 */
	xmlCharEncOutFunc(encoder, ret->conv, NULL); 
    } else
        ret->conv = NULL;
    ret->writecallback = NULL;
    ret->closecallback = NULL;
    ret->context = NULL;
    ret->written = 0;

    return(ret);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlFreeParserInputBuffer:
 * @in:  a buffered parser input
 *
 * Free up the memory used by a buffered parser input
 */
void
xmlFreeParserInputBuffer(xmlParserInputBufferPtr in) {
    if (in == NULL) return;

    if (in->raw) {
        xmlBufferFree(in->raw);
	in->raw = NULL;
    }
    if (in->encoder != NULL) {
        xmlCharEncCloseFunc(in->encoder);
    }
    if (in->closecallback != NULL) {
	in->closecallback(in->context);
    }
    if (in->buffer != NULL) {
        xmlBufferFree(in->buffer);
	in->buffer = NULL;
    }

    xmlFree(in);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlOutputBufferClose:
 * @out:  a buffered output
 *
 * flushes and close the output I/O channel
 * and free up all the associated resources
 *
 * Returns the number of byte written or -1 in case of error.
 */
int
xmlOutputBufferClose(xmlOutputBufferPtr out)
{
    int written;
    int err_rc = 0;

    if (out == NULL)
        return (-1);
    if (out->writecallback != NULL)
        xmlOutputBufferFlush(out);
    if (out->closecallback != NULL) {
        err_rc = out->closecallback(out->context);
    }
    written = out->written;
    if (out->conv) {
        xmlBufferFree(out->conv);
        out->conv = NULL;
    }
    if (out->encoder != NULL) {
        xmlCharEncCloseFunc(out->encoder);
    }
    if (out->buffer != NULL) {
        xmlBufferFree(out->buffer);
        out->buffer = NULL;
    }

    if (out->error)
        err_rc = -1;
    xmlFree(out);
    return ((err_rc == 0) ? written : err_rc);
}
#endif /* LIBXML_OUTPUT_ENABLED */

xmlParserInputBufferPtr
__xmlParserInputBufferCreateFilename(const char *URI, xmlCharEncoding enc) {
    xmlParserInputBufferPtr ret;
    int i = 0;
    void *context = NULL;

    if (xmlInputCallbackInitialized == 0)
	xmlRegisterDefaultInputCallbacks();

    if (URI == NULL) return(NULL);

    /*
     * Try to find one of the input accept method accepting that scheme
     * Go in reverse to give precedence to user defined handlers.
     */
    if (context == NULL) {
	for (i = xmlInputCallbackNr - 1;i >= 0;i--) {
	    if ((xmlInputCallbackTable[i].matchcallback != NULL) &&
		(xmlInputCallbackTable[i].matchcallback(URI) != 0)) {
		context = xmlInputCallbackTable[i].opencallback(URI);
		if (context != NULL) {
		    break;
		}
	    }
	}
    }
    if (context == NULL) {
	return(NULL);
    }

    /*
     * Allocate the Input buffer front-end.
     */
    ret = xmlAllocParserInputBuffer(enc);
    if (ret != NULL) {
	ret->context = context;
	ret->readcallback = xmlInputCallbackTable[i].readcallback;
	ret->closecallback = xmlInputCallbackTable[i].closecallback;
#ifdef HAVE_ZLIB_H
	if ((xmlInputCallbackTable[i].opencallback == xmlGzfileOpen) &&
		(strcmp(URI, "-") != 0)) {
	    if (((z_stream *)context)->avail_in > 4) {
	        char *cptr, buff4[4];
		cptr = (char *) ((z_stream *)context)->next_in;
		if (gzread(context, buff4, 4) == 4) {
		    if (strncmp(buff4, cptr, 4) == 0)
		        ret->compressed = 0;
		    else
		        ret->compressed = 1;
		    gzrewind(context);
		}
	    }
	}
#endif
    }
    else
      xmlInputCallbackTable[i].closecallback (context);

    return(ret);
}

/**
 * xmlParserInputBufferCreateFilename:
 * @URI:  a C string containing the URI or filename
 * @enc:  the charset encoding if known
 *
 * Create a buffered parser input for the progressive parsing of a file
 * If filename is "-' then we use stdin as the input.
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time.
 * Do an encoding check if enc == XML_CHAR_ENCODING_NONE
 *
 * Returns the new parser input or NULL
 */
xmlParserInputBufferPtr
xmlParserInputBufferCreateFilename(const char *URI, xmlCharEncoding enc) {
    if ((xmlParserInputBufferCreateFilenameValue)) {
		return xmlParserInputBufferCreateFilenameValue(URI, enc);
	}
	return __xmlParserInputBufferCreateFilename(URI, enc);
}

#ifdef LIBXML_OUTPUT_ENABLED
xmlOutputBufferPtr
__xmlOutputBufferCreateFilename(const char *URI,
                              xmlCharEncodingHandlerPtr encoder,
                              int compression ATTRIBUTE_UNUSED) {
    xmlOutputBufferPtr ret;
    xmlURIPtr puri;
    int i = 0;
    void *context = NULL;
    char *unescaped = NULL;
#ifdef HAVE_ZLIB_H
    int is_file_uri = 1;
#endif

    if (xmlOutputCallbackInitialized == 0)
	xmlRegisterDefaultOutputCallbacks();

    if (URI == NULL) return(NULL);

    puri = xmlParseURI(URI);
    if (puri != NULL) {
#ifdef HAVE_ZLIB_H
        if ((puri->scheme != NULL) &&
	    (!xmlStrEqual(BAD_CAST puri->scheme, BAD_CAST "file")))
	    is_file_uri = 0;
#endif
	/*
	 * try to limit the damages of the URI unescaping code.
	 */
	if ((puri->scheme == NULL) ||
	    (xmlStrEqual(BAD_CAST puri->scheme, BAD_CAST "file")))
	    unescaped = xmlURIUnescapeString(URI, 0, NULL);
	xmlFreeURI(puri);
    }

    /*
     * Try to find one of the output accept method accepting that scheme
     * Go in reverse to give precedence to user defined handlers.
     * try with an unescaped version of the URI
     */
    if (unescaped != NULL) {
#ifdef HAVE_ZLIB_H
	if ((compression > 0) && (compression <= 9) && (is_file_uri == 1)) {
	    context = xmlGzfileOpenW(unescaped, compression);
	    if (context != NULL) {
		ret = xmlAllocOutputBuffer(encoder);
		if (ret != NULL) {
		    ret->context = context;
		    ret->writecallback = xmlGzfileWrite;
		    ret->closecallback = xmlGzfileClose;
		}
		xmlFree(unescaped);
		return(ret);
	    }
	}
#endif
	for (i = xmlOutputCallbackNr - 1;i >= 0;i--) {
	    if ((xmlOutputCallbackTable[i].matchcallback != NULL) &&
		(xmlOutputCallbackTable[i].matchcallback(unescaped) != 0)) {
#if defined(LIBXML_HTTP_ENABLED) && defined(HAVE_ZLIB_H)
		/*  Need to pass compression parameter into HTTP open calls  */
		if (xmlOutputCallbackTable[i].matchcallback == xmlIOHTTPMatch)
		    context = xmlIOHTTPOpenW(unescaped, compression);
		else
#endif
		    context = xmlOutputCallbackTable[i].opencallback(unescaped);
		if (context != NULL)
		    break;
	    }
	}
	xmlFree(unescaped);
    }

    /*
     * If this failed try with a non-escaped URI this may be a strange
     * filename
     */
    if (context == NULL) {
#ifdef HAVE_ZLIB_H
	if ((compression > 0) && (compression <= 9) && (is_file_uri == 1)) {
	    context = xmlGzfileOpenW(URI, compression);
	    if (context != NULL) {
		ret = xmlAllocOutputBuffer(encoder);
		if (ret != NULL) {
		    ret->context = context;
		    ret->writecallback = xmlGzfileWrite;
		    ret->closecallback = xmlGzfileClose;
		}
		return(ret);
	    }
	}
#endif
	for (i = xmlOutputCallbackNr - 1;i >= 0;i--) {
	    if ((xmlOutputCallbackTable[i].matchcallback != NULL) &&
		(xmlOutputCallbackTable[i].matchcallback(URI) != 0)) {
#if defined(LIBXML_HTTP_ENABLED) && defined(HAVE_ZLIB_H)
		/*  Need to pass compression parameter into HTTP open calls  */
		if (xmlOutputCallbackTable[i].matchcallback == xmlIOHTTPMatch)
		    context = xmlIOHTTPOpenW(URI, compression);
		else
#endif
		    context = xmlOutputCallbackTable[i].opencallback(URI);
		if (context != NULL)
		    break;
	    }
	}
    }

    if (context == NULL) {
	return(NULL);
    }

    /*
     * Allocate the Output buffer front-end.
     */
    ret = xmlAllocOutputBuffer(encoder);
    if (ret != NULL) {
	ret->context = context;
	ret->writecallback = xmlOutputCallbackTable[i].writecallback;
	ret->closecallback = xmlOutputCallbackTable[i].closecallback;
    }
    return(ret);
}

/**
 * xmlOutputBufferCreateFilename:
 * @URI:  a C string containing the URI or filename
 * @encoder:  the encoding converter or NULL
 * @compression:  the compression ration (0 none, 9 max).
 *
 * Create a buffered  output for the progressive saving of a file
 * If filename is "-' then we use stdout as the output.
 * Automatic support for ZLIB/Compress compressed document is provided
 * by default if found at compile-time.
 * TODO: currently if compression is set, the library only support
 *       writing to a local file.
 *
 * Returns the new output or NULL
 */
xmlOutputBufferPtr
xmlOutputBufferCreateFilename(const char *URI,
                              xmlCharEncodingHandlerPtr encoder,
                              int compression ATTRIBUTE_UNUSED) {
    if ((xmlOutputBufferCreateFilenameValue)) {
		return xmlOutputBufferCreateFilenameValue(URI, encoder, compression);
	}
	return __xmlOutputBufferCreateFilename(URI, encoder, compression);
}
#endif /* LIBXML_OUTPUT_ENABLED */

/**
 * xmlParserInputBufferCreateFile:
 * @file:  a FILE* 
 * @enc:  the charset encoding if known
 *
 * Create a buffered parser input for the progressive parsing of a FILE *
 * buffered C I/O
 *
 * Returns the new parser input or NULL
 */
xmlParserInputBufferPtr
xmlParserInputBufferCreateFile(FILE *file, xmlCharEncoding enc) {
    xmlParserInputBufferPtr ret;

    if (xmlInputCallbackInitialized == 0)
	xmlRegisterDefaultInputCallbacks();

    if (file == NULL) return(NULL);

    ret = xmlAllocParserInputBuffer(enc);
    if (ret != NULL) {
        ret->context = file;
	ret->readcallback = xmlFileRead;
	ret->closecallback = xmlFileFlush;
    }

    return(ret);
}

#ifdef LIBXML_OUTPUT_ENABLED
/**
 * xmlOutputBufferCreateFile:
 * @file:  a FILE* 
 * @encoder:  the encoding converter or NULL
 *
 * Create a buffered output for the progressive saving to a FILE *
 * buffered C I/O
 *
 * Returns the