I tried to use xmlMemSetup and libxml2 gives me an error.
Probably I'm missing something.
This is a simple main I wrote:
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>
#include <libxml/encoding.h>
#include <stdlib.h>
const unsigned int mgc = 0x88DEFEA7;
static void *xml2_alloc(size_t sz)
{
void *mem = malloc(sz + sizeof(int));
const unsigned int *mark = mem;
*mark = mgc;
return (char *) mem + sizeof(int);
}
static void xml2_free(void *emem)
{
void *mem = (char *)emem - sizeof(int);
const unsigned int *mark = mem;
if (*mark == mgc) {
free(mem);
}
}
static void *xml2_realloc(void * emem, size_t sz)
{
void *mem = (char *)emem - sizeof(int);
void *mem_re = xmlMemRealloc(mem, sz);
if (mem_re != NULL)
return (char *) mem_re + sizeof(int);
else
return NULL;
}
xmlDocPtr
parseDoc(char *xmlfile)
{
xmlDocPtr doc;
xmlNodePtr root;
doc = xmlParseFile(xmlfile);
if (doc == NULL ) {
fprintf(stderr,"Document not parsed successfully. \n");
xmlFreeDoc(doc);
return (NULL);
}
root = xmlDocGetRootElement(doc);
if (root == NULL) {
fprintf(stderr,"empty document\n");
xmlFreeDoc(doc);
return (NULL);
}
return doc;
}
int
main(int argc, char **argv) {
xmlDocPtr doc;
xmlChar *bufptr;
int size = 0;
char *xmlfile = "/usr/local/apache/conf/conf_prova.xml";
xmlMemSetup(xml2_free, xml2_alloc, xml2_realloc, xmlMemoryStrdup);
xmlInitParser();
doc = parseDoc (xmlfile);
if (doc == NULL) {
fprintf(stderr,"[ERRORE] ParseDoc ha ritornato NULL\n");
return -1;
}
fprintf(stderr,"[OK] ParseDoc Ok\n");
xmlFreeDoc(doc);
xmlCleanupParser();
return 0;
}
The xml document is very simple:
<?xml version="1.0" encoding="ISO-8859-1"?>
<CONFIGURAZIONE>
<Q>3</Q>
<S>
<H>e</H>
<P>80</P>
<L>p.l</L>
<PAR>
<AD>on</AD>
<S>off</S>
<C>r</C>
<N>0</N>
<W>1</W>
</PAR>
</S>
.....
</CONFIGURAZIONE>
this is the error I get:
[EMAIL PROTECTED] test]$ ./main
xmlMallocBreakpoint reached on block 0
Memory tag error occurs :0x805c140
bye
Memory tag error occurs :0x805c158
bye
/usr/local/apache/conf/conf_prova.xml:1: parser error : Memory
allocation failed
<?xml version="1.0" encoding="ISO-8859-1"?>
^
Document not parsed successfully.
[ERRORE] ParseDoc ha ritornato NULL
What am I missing?
Marco
Daniel Veillard ha scritto:
> On Tue, Aug 07, 2007 at 12:09:05PM +0200, Marco Spinetti wrote:
>
>> Reading the docs, I don't understand the difference between xmlMemSetup
>> and xmlGcMemSetup.
>> I need to overwrite libxml2 memory allocation and I don't understand if
>> I have to use xmlGcMemSetup or xmlMemSetup.
>> Any hints?
>>
>
> http://xmlsoft.org/html/libxml-xmlmemory.html#xmlGcMemSetup
> the later has an extra function allowing a special function for
> allocation of atomic area (i.e. areas which will never be grown).
> In doubt use xmlMemSetup()
>
>
>> Other question: is xmlInitMemory(9 should be called before use
>> xmlGcMemSetup or xmlMemSetup?
>>
>
> no, xmlMemSetup must be the very first call to libxml2 then call
> xmlInitParser(). Don't call xmlInitMemory by yourself, xmlInitParser
> will do it.
>
> Daniel
>
>
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