Re: [xml] Newbie question about an example from the web site
- From: Menu Jacques <imj-219 bluewin ch>
- To: xml gnome org
- Subject: Re: [xml] Newbie question about an example from the web site
- Date: Tue, 1 Dec 2015 07:18:44 +0100
Hello folks,
Found out that the code of convert() in EncodingConversionExample.c wasn’t so clear after all...
Fixing that with the code below gives:
07:09:48 (722) menu@ - ~/examples_libxml2 > ./DoEncodingConversionExample.bash
--> Compiling EncodingConversionExample.c...
16 -rwxr-xr-x. 1 menu menu 13243 Dec 1 07:10 EncodingConversionExample
--> Running EncodingConversionExample:
--> encoding = ISO-8859-1
--> content = élàö
--> size = 8
--> out_size = 15
--> temp = 7
--> ret = 13
--> temp = 7
--> out_size = 13
conversion was successful. converted: 7 octets.
--> out = élà ö
<?xml version="1.0" encoding="ISO-8859-1"?>
<root>élàö</root>
With ISO-8859-7, though:
07:10:05 (722) menu@ - ~/examples_libxml2 > ./DoEncodingConversionExample.bash
--> Compiling EncodingConversionExample.c...
16 -rwxr-xr-x. 1 menu menu 13243 Dec 1 07:10 EncodingConversionExample
--> Running EncodingConversionExample:
--> encoding = ISO-8859-7
--> content = élàö
--> size = 8
--> out_size = 15
--> temp = 7
./DoEncodingConversionExample.bash: line 28: 14446 Segmentation fault (core dumped) ./${EXECUTABLE}
"élàö"
//-----------------------------
#include <string.h>
#include <libxml/parser.h>
unsigned char*
convert (unsigned char *in, char *encoding)
{
unsigned char *out;
int ret,size,out_size,temp;
xmlCharEncodingHandlerPtr handler;
size = (int)strlen(in)+1;
out_size = size*2-1;
out = malloc((size_t)out_size);
printf("--> size = %d\n", size);
printf("--> out_size = %d\n", out_size);
if (out) {
handler = xmlFindCharEncodingHandler(encoding);
if (!handler) {
printf("--> %s encoding handler not found\n", encoding);
free(out);
out = NULL;
}
}
if (out) {
temp=size-1;
printf("--> temp = %d\n", temp);
/**
* xmlCharEncodingInputFunc:
* @out: a pointer to an array of bytes to store the UTF-8 result
* @outlen: the length of @out
* @in: a pointer to an array of chars in the original encoding
* @inlen: the length of @in
*
* Take a block of chars in the original encoding and try to convert
* it to an UTF-8 block of chars out.
*
* Returns the number of bytes written, -1 if lack of space, or -2
* if the transcoding failed.
* The value of @inlen after return is the number of octets consumed
* if the return value is positive, else unpredictiable.
* The value of @outlen after return is the number of octets consumed.
*/
ret = handler->input(out, &out_size, in, &temp);
if (ret == -1) {
printf("Conversion couldn't be done, lack of space.\n");
} else {
if (ret == -2) {
printf("Conversion couldn't be done, transcoding failed.\n");
} else {
if (ret == 0) {
printf("--> temp = %d\n", temp);
printf("--> temp = %d\n", temp);
printf("--> out_size = %d\n", out_size);
printf("conversion wasn't successful. converted: %i octets.\n",temp);
free(out);
out = NULL;
} else {
// ret > 0
printf("--> ret = %d\n", ret);
printf("--> temp = %d\n", temp);
printf("--> out_size = %d\n", out_size);
printf("conversion was successful. converted: %i octets.\n",temp);
out = realloc(out,out_size+1);
out[out_size]=0; /*null terminating out*/
}}}
} else {
printf("no mem\n");
}
return (out);
}
int
main(int argc, char **argv) {
unsigned char *content, *out;
xmlDocPtr doc;
xmlNodePtr rootnode;
char *encoding = "ISO-8859-7"; // JMI, was -1
if (argc <= 1) {
printf("Usage: %s content\n", argv[0]);
return(0);
}
printf("--> encoding = %s\n", encoding);
content = argv[1];
printf("--> content = %s\n", content);
out = convert(content, encoding);
printf("--> out = %s\n", out);
doc = xmlNewDoc ("1.0");
rootnode = xmlNewDocNode(doc, NULL, (const xmlChar*)"root", out);
xmlDocSetRootElement(doc, rootnode);
xmlSaveFormatFileEnc("-", doc, encoding, 1);
return (1);
}
//-----------------------------
Le 30 nov. 2015 à 23:31, Menu Jacques <imj-219 bluewin ch> a écrit :
Hello,
Same problem on CentOS 7.1.
My environment contains:
23:25:30 (690) menu@ - ~ > echo $LC_TYPE
iso_8859_1
23:25:48 (691) menu@ - ~ > echo $LANG
C
23:26:00 (692) menu@ - ~ > echo GDM_LANG
GDM_LANG
and I get:
23:27:02 (695) menu@ - ~/examples_libxml2 > ./EncodingConversionExample foo
--> content = foo
--> size = 4
--> out_size = 7
--> temp = 3
--> temp-size+1 = 0
conversion wasn't successful.
--> out = (null)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root/>
23:27:20 (696) menu@ - ~/examples_libxml2 > ./EncodingConversionExample éöîà
--> content = éöîà
--> size = 9
--> out_size = 17
--> temp = 8
--> temp-size+1 = 0
conversion wasn't successful.
--> out = (null)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root/>
I’m clearly doing something wrong, but what?
JM
Le 25 nov. 2015 à 13:08, Menu Jacques <imj-219 bluewin ch> a écrit :
I use:
13:07:34 (254) menu@ - ~/libxml2-git > apt list libxml2 libxml2-dev
Listing... Done
libxml2/stable,now 2.9.1+dfsg1-5 i386 [installed,automatic]
libxml2-dev/stable,now 2.9.1+dfsg1-5 i386 [installed]
on Debian 8 32bit (jessie)
JM
Le 25 nov. 2015 à 11:17, Menu Jacques <imj-219 bluewin ch> a écrit :
Hello folks,
I’ve successfully built the examples from http://xmlsoft.org/tutorial/index.html, except the last one
about encoding conversion.
I added printouts to the original code to help (see below) and get:
10:51:35 (250) menu@ - ~/libxml2-git > ./EncodingConversionExample foo
--> content = foo
--> size = 4
--> out_size = 7
--> temp = 3
--> temp-size+1 = 0
conversion wasn't successful.
--> out = (null)
<?xml version="1.0" encoding="ISO-8859-1"?>
<root/>
Thanks for your help!
JM
—
11:15:24 (251) menu@ - ~/libxml2-git > cat EncodingConversionExample.c
#include <string.h>
#include <libxml/parser.h>
unsigned char*
convert (unsigned char *in, char *encoding)
{
unsigned char *out;
int ret,size,out_size,temp;
xmlCharEncodingHandlerPtr handler;
size = (int)strlen(in)+1;
out_size = size*2-1;
out = malloc((size_t)out_size);
printf("--> size = %d\n", size);
printf("--> out_size = %d\n", out_size);
if (out) {
handler = xmlFindCharEncodingHandler(encoding);
if (!handler) {
printf("--> %s encoding handler not found\n", encoding);
free(out);
out = NULL;
}
}
if (out) {
temp=size-1;
printf("--> temp = %d\n", temp);
ret = handler->input(out, &out_size, in, &temp);
if (ret || temp-size+1) {
printf("--> temp-size+1 = %d\n", temp-size+1);
if (ret) {
printf("conversion wasn't successful.\n");
} else {
printf("conversion wasn't successful. converted: %i octets.\n",temp);
}
free(out);
out = NULL;
} else {
out = realloc(out,out_size+1);
out[out_size]=0; /*null terminating out*/
}
} else {
printf("no mem\n");
}
return (out);
}
int
main(int argc, char **argv) {
unsigned char *content, *out;
xmlDocPtr doc;
xmlNodePtr rootnode;
char *encoding = "ISO-8859-1";
if (argc <= 1) {
printf("Usage: %s content\n", argv[0]);
return(0);
}
content = argv[1];
printf("--> content = %s\n", content);
out = convert(content, encoding);
printf("--> out = %s\n", out);
doc = xmlNewDoc ("1.0");
rootnode = xmlNewDocNode(doc, NULL, (const xmlChar*)"root", out);
xmlDocSetRootElement(doc, rootnode);
xmlSaveFormatFileEnc("-", doc, encoding, 1);
return (1);
}
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