119 lines
4.6 KiB
C
119 lines
4.6 KiB
C
/*
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* Copyright (C) 2015 Jolla Ltd.
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* Contact: Slava Monich <slava.monich@jolla.com>
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*
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* You may use this file under the terms of the BSD license as follows:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Nemo Mobile nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <expat.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#define EXPAT_FUNCTIONS(f) \
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f(XML_Parser, XML_ExternalEntityParserCreate, \
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(XML_Parser parser, const XML_Char* context, const XML_Char* encoding), \
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(parser, context, encoding), NULL) \
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f(XML_Bool, XML_ParserReset,\
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(XML_Parser parser, const XML_Char* encoding), \
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(parser, encoding), XML_FALSE) \
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f(void, XML_SetUserData, \
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(XML_Parser parser, void* userData), \
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(parser, userData), (void)0) \
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f(void, XML_SetUnknownEncodingHandler, \
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(XML_Parser parser, XML_UnknownEncodingHandler handler, void* data), \
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(parser, handler, data), (void)0) \
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f(void, XML_SetCharacterDataHandler, \
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(XML_Parser parser, XML_CharacterDataHandler handler), \
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(parser, handler), (void)0) \
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f(enum XML_Error, XML_UseForeignDTD, \
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(XML_Parser parser, XML_Bool useDTD), \
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(parser, useDTD), XML_ERROR_UNEXPECTED_STATE) \
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f(enum XML_Status, XML_SetEncoding, \
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(XML_Parser parser, const XML_Char* encoding), \
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(parser, encoding), XML_STATUS_ERROR) \
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f(void, XML_SetStartElementHandler, \
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(XML_Parser parser, XML_StartElementHandler handler), \
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(parser, handler), (void)0) \
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f(void, XML_SetEndElementHandler, \
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(XML_Parser parser, XML_EndElementHandler handler), \
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(parser, handler), (void)0) \
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f(void, XML_ParserFree, \
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(XML_Parser parser), \
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(parser), (void)0) \
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f(enum XML_Status, XML_Parse, \
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(XML_Parser parser, const char* s, int len, int isFinal), \
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(parser, s, len, isFinal), XML_STATUS_ERROR)
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static struct {
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void* handle;
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union {
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struct expat_proc {
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XML_Parser (*XML_ParserCreate)(const XML_Char* encoding);
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#define FN_POINTER(type,name,params,args,fail) type (* name) params;
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EXPAT_FUNCTIONS(FN_POINTER)
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} expat;
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void* entry[1];
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} fn;
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} expat;
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static const char* expat_names[] = {
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"XML_ParserCreate",
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#define FN_NAME(type,name,params,args,fail) #name,
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EXPAT_FUNCTIONS(FN_NAME)
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};
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#define EXPAT_NUM_FUNCTIONS (sizeof(expat_names)/sizeof(expat_names[0]))
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#define EXPAT_NO_HANDLE ((void*)-1)
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#define EXPAT_SO "/usr/lib/libexpat.so.1"
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/* XML_ParserCreate() is the special function where we load the library */
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XML_Parser
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XML_ParserCreate(
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const XML_Char* encoding)
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{
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if (!expat.handle) {
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expat.handle = dlopen(EXPAT_SO, RTLD_LAZY);
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if (expat.handle) {
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unsigned int i;
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for (i=0; i<EXPAT_NUM_FUNCTIONS; i++) {
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expat.fn.entry[i] = dlsym(expat.handle, expat_names[i]);
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}
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} else {
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expat.handle = EXPAT_NO_HANDLE;
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}
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}
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return expat.fn.expat.XML_ParserCreate ?
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expat.fn.expat.XML_ParserCreate(encoding) :
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NULL;
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}
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/* All other wrappers are generated by the preprocessor */
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#define FN_IMPL(type,name,params,args,fail) type name params \
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{ return expat.fn.expat.name ? expat.fn.expat.name args : fail; }
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EXPAT_FUNCTIONS(FN_IMPL)
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