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/*
* icu.c: Example how to use ICU for character encoding conversion
*
* This example shows how to use ICU by installing a custom character
* encoding converter with xmlCtxtSetCharEncConvImpl, available
* since libxml2 2.14.
*
* This approach makes it possible to use ICU even if libxml2 is
* compiled without ICU support. It also makes sure that *only* ICU
* is used. Many Linux distros currently ship libxml2 with support
* for both ICU and iconv which makes the library's behavior hard to
* predict.
*
* The long-term plan is to make libxml2 only support a single
* conversion library internally (iconv on POSIX).
*/
#include <stdio.h>
#include <libxml/parser.h>
#include <unicode/ucnv.h>
#define ICU_PIVOT_BUF_SIZE 1024
typedef struct {
UConverter *uconv; /* for conversion between an encoding and UTF-16 */
UConverter *utf8; /* for conversion between UTF-8 and UTF-16 */
UChar *pivot_source;
UChar *pivot_target;
int isInput;
UChar pivot_buf[ICU_PIVOT_BUF_SIZE];
} myConvCtxt;
static int
icuConvert(unsigned char *out, int *outlen,
const unsigned char *in, int *inlen, void *vctxt) {
myConvCtxt *cd = vctxt;
const char *ucv_in = (const char *) in;
char *ucv_out = (char *) out;
UConverter *target, *source;
UErrorCode err = U_ZERO_ERROR;
int ret;
if ((out == NULL) || (outlen == NULL) || (inlen == NULL) || (in == NULL)) {
if (outlen != NULL)
*outlen = 0;
return XML_ENC_ERR_INTERNAL;
}
/*
* Note that the ICU API is stateful. It can always consume a certain
* amount of input even if the output buffer would overflow. The
* remaining input must be processed by calling ucnv_convertEx with a
* possibly empty input buffer.
*
* ucnv_convertEx is always called with reset and flush set to 0,
* so we don't mess up the state. This should never generate
* U_TRUNCATED_CHAR_FOUND errors.
*/
if (cd->isInput) {
source = cd->uconv;
target = cd->utf8;
} else {
source = cd->utf8;
target = cd->uconv;
}
ucnv_convertEx(target, source, &ucv_out, ucv_out + *outlen,
&ucv_in, ucv_in + *inlen, cd->pivot_buf,
&cd->pivot_source, &cd->pivot_target,
cd->pivot_buf + ICU_PIVOT_BUF_SIZE, 0, 0, &err);
*inlen = ucv_in - (const char*) in;
*outlen = ucv_out - (char *) out;
if (U_SUCCESS(err)) {
ret = XML_ENC_ERR_SUCCESS;
} else {
switch (err) {
case U_TRUNCATED_CHAR_FOUND:
/* Shouldn't happen without flush */
ret = XML_ENC_ERR_SUCCESS;
break;
case U_BUFFER_OVERFLOW_ERROR:
ret = XML_ENC_ERR_SPACE;
break;
case U_INVALID_CHAR_FOUND:
case U_ILLEGAL_CHAR_FOUND:
case U_ILLEGAL_ESCAPE_SEQUENCE:
case U_UNSUPPORTED_ESCAPE_SEQUENCE:
ret = XML_ENC_ERR_INPUT;
break;
case U_MEMORY_ALLOCATION_ERROR:
ret = XML_ENC_ERR_MEMORY;
break;
default:
ret = XML_ENC_ERR_INTERNAL;
break;
}
}
return ret;
}
static int
icuOpen(const char* name, int isInput, myConvCtxt **out)
{
UErrorCode status;
myConvCtxt *cd;
*out = NULL;
cd = xmlMalloc(sizeof(myConvCtxt));
if (cd == NULL)
return XML_ERR_NO_MEMORY;
cd->isInput = isInput;
cd->pivot_source = cd->pivot_buf;
cd->pivot_target = cd->pivot_buf;
status = U_ZERO_ERROR;
cd->uconv = ucnv_open(name, &status);
if (U_FAILURE(status))
goto error;
status = U_ZERO_ERROR;
if (isInput) {
ucnv_setToUCallBack(cd->uconv, UCNV_TO_U_CALLBACK_STOP,
NULL, NULL, NULL, &status);
}
else {
ucnv_setFromUCallBack(cd->uconv, UCNV_FROM_U_CALLBACK_STOP,
NULL, NULL, NULL, &status);
}
if (U_FAILURE(status))
goto error;
status = U_ZERO_ERROR;
cd->utf8 = ucnv_open("UTF-8", &status);
if (U_FAILURE(status))
goto error;
*out = cd;
return 0;
error:
if (cd->uconv)
ucnv_close(cd->uconv);
xmlFree(cd);
if (status == U_FILE_ACCESS_ERROR)
return XML_ERR_UNSUPPORTED_ENCODING;
if (status == U_MEMORY_ALLOCATION_ERROR)
return XML_ERR_NO_MEMORY;
return XML_ERR_SYSTEM;
}
static void
icuClose(myConvCtxt *cd)
{
if (cd == NULL)
return;
ucnv_close(cd->uconv);
ucnv_close(cd->utf8);
xmlFree(cd);
}
static void
icuConvCtxtDtor(void *vctxt) {
icuClose(vctxt);
}
static int
icuConvImpl(void *vctxt, const char *name,
xmlCharEncConverter *conv) {
myConvCtxt *inputCtxt = NULL;
myConvCtxt *outputCtxt = NULL;
int ret;
ret = icuOpen(name, 1, &inputCtxt);
if (ret != 0)
goto error;
ret = icuOpen(name, 0, &outputCtxt);
if (ret != 0)
goto error;
conv->input = icuConvert;
conv->output = icuConvert;
conv->ctxtDtor = icuConvCtxtDtor;
conv->inputCtxt = inputCtxt;
conv->outputCtxt = outputCtxt;
return XML_ERR_OK;
error:
if (inputCtxt != NULL)
icuClose(inputCtxt);
if (outputCtxt != NULL)
icuClose(outputCtxt);
return ret;
}
int
main(void) {
xmlParserCtxtPtr ctxt;
xmlDocPtr doc;
const char *xml;
xmlChar *content;
int ret = 0;
/*
* We use IBM-1051, an alias for HP Roman, as a simple example that
* ICU supports, but iconv (typically) doesn't.
*
* Character code 0xDE is U+00DF Latin Small Letter Sharp S.
*/
xml = "<doc>\xDE</doc>";
ctxt = xmlNewParserCtxt();
xmlCtxtSetCharEncConvImpl(ctxt, icuConvImpl, NULL);
doc = xmlCtxtReadDoc(ctxt, BAD_CAST xml, NULL, "IBM-1051", 0);
xmlFreeParserCtxt(ctxt);
content = xmlNodeGetContent((xmlNodePtr) doc);
printf("content: %s\n", content);
if (!xmlStrEqual(content, BAD_CAST "\xC3\x9F")) {
fprintf(stderr, "converison failed\n");
ret = 1;
}
xmlFree(content);
xmlFreeDoc(doc);
return ret;
}
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