Function xmlParserInputBufferGrow

ThirdParty/libxml2/vtklibxml2/xmlIO.c:2344–2406

* xmlParserInputBufferGrow: * @in: a buffered parser input * @len: indicative value of the amount of chars to read * * Grow up the content of the input buffer, the old data are preserved * This routine handle the I18N transcoding to internal UTF-8 * This routine is used when operating the parser in normal (pull) mode * * TODO: one should be able to remove one extra copy by copying direct

 *         in case of error.
 */
int
xmlParserInputBufferGrow(xmlParserInputBufferPtr in, int len) {
    xmlBufPtr buf;
    int res = 0;

    if ((in == NULL) || (in->error)) return(-1);
    if ((len <= MINLEN) && (len != 4))
        len = MINLEN;

    if (in->encoder == NULL) {
        if (in->readcallback == NULL)
            return(0);
        buf = in->buffer;
    } else {
        if (in->raw == NULL) {
	    in->raw = xmlBufCreate();
	}
        buf = in->raw;
    }

    /*
     * Call the read method for this I/O type.
     */
    if (in->readcallback != NULL) {
        if (xmlBufGrow(buf, len + 1) < 0) {
            in->error = XML_ERR_NO_MEMORY;
            return(-1);
        }

	res = in->readcallback(in->context, (char *)xmlBufEnd(buf), len);
	if (res <= 0)
	    in->readcallback = endOfInput;
        if (res < 0) {
            if (res == -1)
                in->error = XML_IO_UNKNOWN;
            else
                in->error = -res;
            return(-1);
        }

        if (xmlBufAddLen(buf, res) < 0) {
            in->error = XML_ERR_NO_MEMORY;
            return(-1);
        }
    }

    /*
     * try to establish compressed status of input if not done already
     */
    if (in->compressed == -1) {
#ifdef LIBXML_LZMA_ENABLED
	if (in->readcallback == xmlXzfileRead)
            in->compressed = __libxml2_xzcompressed(in->context);
#endif
    }

    if (in->encoder != NULL) {
	res = xmlCharEncInput(in);