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encoding: Fix encoding lookup with xmlOpenCharEncodingHandler

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Make xmlOpenCharEncodingHandler call xmlParseCharEncoding first so we
prefer our own handlers for names like "UTF8". Only UTF-16 needs an
exception.

Make callers check the return value. For UTF-8, a NULL encoding doesn't
mean an error.

Remove unnecessary UTF-8 check from htmlFindOutputEncoder. Don't try to
look up ASCII handler since the HTML handler is always available.

Fix return code of xmlParseCharEncoding.

Should fix #744.
This commit is contained in:
Nick Wellnhofer 2024-06-22 19:15:17 +02:00
parent b8903b9e0d
commit 5b893fa999
3 changed files with 34 additions and 32 deletions
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19
HTMLtree.c
View File

@ -385,22 +385,17 @@ htmlFindOutputEncoder(const char *encoding) {
xmlCharEncodingHandler *handler = NULL;
if (encoding != NULL) {
xmlCharEncoding enc;
int res;
enc = xmlParseCharEncoding(encoding);
if (enc != XML_CHAR_ENCODING_UTF8) {
xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (handler == NULL)
htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
}
res = xmlOpenCharEncodingHandler(encoding, /* output */ 1,
&handler);
if (res != XML_ERR_OK)
htmlSaveErr(XML_SAVE_UNKNOWN_ENCODING, NULL, encoding);
} else {
/*
* Fallback to HTML or ASCII when the encoding is unspecified
* Fallback to HTML when the encoding is unspecified
*/
if (handler == NULL)
xmlOpenCharEncodingHandler("HTML", /* output */ 1, &handler);
if (handler == NULL)
xmlOpenCharEncodingHandler("ascii", /* output */ 1, &handler);
xmlOpenCharEncodingHandler("HTML", /* output */ 1, &handler);
}
return(handler);

29
encoding.c
View File

@ -1161,7 +1161,7 @@ xmlParseCharEncoding(const char* name)
if (!strcmp(upper, "SHIFT_JIS")) return(XML_CHAR_ENCODING_SHIFT_JIS);
if (!strcmp(upper, "EUC-JP")) return(XML_CHAR_ENCODING_EUC_JP);
return(XML_CHAR_ENCODING_ERROR);
return(XML_CHAR_ENCODING_NONE);
}
/**
@ -1931,9 +1931,7 @@ int
xmlOpenCharEncodingHandler(const char *name, int output,
xmlCharEncodingHandler **out) {
const char *nalias;
const char *norig;
xmlCharEncoding enc;
int ret;
if (out == NULL)
return(XML_ERR_ARGUMENT);
@ -1945,22 +1943,27 @@ xmlOpenCharEncodingHandler(const char *name, int output,
/*
* Do the alias resolution
*/
norig = name;
nalias = xmlGetEncodingAlias(name);
if (nalias != NULL)
name = nalias;
ret = xmlFindHandler(name, output, out);
if (*out != NULL)
return(0);
if (ret != XML_ERR_UNSUPPORTED_ENCODING)
return(ret);
/*
* Fallback using the canonical names
* UTF-16 needs the built-in handler which is only available via
* xmlFindHandler.
*/
enc = xmlParseCharEncoding(norig);
return(xmlLookupCharEncodingHandler(enc, out));
if (xmlStrcasecmp(BAD_CAST name, BAD_CAST "UTF16") == 0) {
name = "UTF-16";
} else if (xmlStrcasecmp(BAD_CAST name, BAD_CAST "UTF-16") != 0) {
enc = xmlParseCharEncoding(name);
if (enc != XML_CHAR_ENCODING_NONE) {
int res = xmlLookupCharEncodingHandler(enc, out);
if (res != XML_ERR_UNSUPPORTED_ENCODING)
return(res);
}
}
return(xmlFindHandler(name, output, out));
}
/**

18
xmlsave.c
View File

@ -343,7 +343,7 @@ xmlNewSaveCtxt(const char *encoding, int options)
res = xmlOpenCharEncodingHandler(encoding, /* output */ 1,
&ret->handler);
if (ret->handler == NULL) {
if (res != XML_ERR_OK) {
xmlSaveErr(NULL, res, NULL, encoding);
xmlFreeSaveCtxt(ret);
return(NULL);
@ -801,7 +801,7 @@ static int xmlSaveSwitchEncoding(xmlSaveCtxtPtr ctxt, const char *encoding) {
int res;
res = xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (handler == NULL) {
if (res != XML_ERR_OK) {
xmlSaveErr(buf, res, NULL, encoding);
return(-1);
}
@ -2669,7 +2669,7 @@ xmlDocDumpFormatMemoryEnc(xmlDocPtr out_doc, xmlChar **doc_txt_ptr,
res = xmlOpenCharEncodingHandler(txt_encoding, /* output */ 1,
&conv_hdlr);
if (conv_hdlr == NULL) {
if (res != XML_ERR_OK) {
xmlSaveErr(NULL, res, NULL, txt_encoding);
return;
}
@ -2784,8 +2784,10 @@ xmlDocFormatDump(FILE *f, xmlDocPtr cur, int format) {
encoding = (const char *) cur->encoding;
if (encoding != NULL) {
xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (handler == NULL) {
int res;
res = xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (res != XML_ERR_OK) {
xmlFree((char *) cur->encoding);
cur->encoding = NULL;
encoding = NULL;
@ -2921,8 +2923,10 @@ xmlSaveFormatFileEnc( const char * filename, xmlDocPtr cur,
encoding = (const char *) cur->encoding;
if (encoding != NULL) {
xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (handler == NULL)
int res;
res = xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
if (res != XML_ERR_OK)
return(-1);
}