static int exif_process_user_comment(image_info_type *ImageInfo, char **pszInfoPtr, char **pszEncoding, char *szValuePtr, int ByteCount)
{
	int   a;
	char  *decode;
	size_t len;;

	*pszEncoding = NULL;
	/* Copy the comment */
	if (ByteCount>=8) {
		const zend_encoding *from, *to;
		if (!memcmp(szValuePtr, "UNICODE\0", 8)) {
			*pszEncoding = estrdup((const char*)szValuePtr);
			szValuePtr = szValuePtr+8;
			ByteCount -= 8;
			/* First try to detect BOM: ZERO WIDTH NOBREAK SPACE (FEFF 16)
			 * since we have no encoding support for the BOM yet we skip that.
			 */
			if (!memcmp(szValuePtr, "\xFE\xFF", 2)) {
				decode = "UCS-2BE";
				szValuePtr = szValuePtr+2;
				ByteCount -= 2;
			} else if (!memcmp(szValuePtr, "\xFF\xFE", 2)) {
				decode = "UCS-2LE";
				szValuePtr = szValuePtr+2;
				ByteCount -= 2;
			} else if (ImageInfo->motorola_intel) {
				decode = ImageInfo->decode_unicode_be;
			} else {
				decode = ImageInfo->decode_unicode_le;
			}
			to = zend_multibyte_fetch_encoding(ImageInfo->encode_unicode);
			from = zend_multibyte_fetch_encoding(decode);
			/* XXX this will fail again if encoding_converter returns on error something different than SIZE_MAX   */
			if (!to || !from || zend_multibyte_encoding_converter(
					(unsigned char**)pszInfoPtr,
					&len,
					(unsigned char*)szValuePtr,
					ByteCount,
					to,
					from) == (size_t)-1) {
				len = exif_process_string_raw(pszInfoPtr, szValuePtr, ByteCount);
			}
			return len;
		} else if (!memcmp(szValuePtr, "ASCII\0\0\0", 8)) {
			*pszEncoding = estrdup((const char*)szValuePtr);
			szValuePtr = szValuePtr+8;
			ByteCount -= 8;
		} else if (!memcmp(szValuePtr, "JIS\0\0\0\0\0", 8)) {
			/* JIS should be tanslated to MB or we leave it to the user - leave it to the user */
			*pszEncoding = estrdup((const char*)szValuePtr);
			szValuePtr = szValuePtr+8;
			ByteCount -= 8;
			/* XXX this will fail again if encoding_converter returns on error something different than SIZE_MAX   */
			to = zend_multibyte_fetch_encoding(ImageInfo->encode_jis);
			from = zend_multibyte_fetch_encoding(ImageInfo->motorola_intel ? ImageInfo->decode_jis_be : ImageInfo->decode_jis_le);
			if (!to || !from || zend_multibyte_encoding_converter(
					(unsigned char**)pszInfoPtr,
					&len,
					(unsigned char*)szValuePtr,
					ByteCount,
					to,
					from) == (size_t)-1) {
				len = exif_process_string_raw(pszInfoPtr, szValuePtr, ByteCount);
			}
			return len;
		} else if (!memcmp(szValuePtr, "\0\0\0\0\0\0\0\0", 8)) {
			/* 8 NULL means undefined and should be ASCII... */
			*pszEncoding = estrdup("UNDEFINED");
			szValuePtr = szValuePtr+8;
			ByteCount -= 8;
		}
	}

	/* Olympus has this padded with trailing spaces.  Remove these first. */
	if (ByteCount>0) {
		for (a=ByteCount-1;a && szValuePtr[a]==' ';a--) {
			(szValuePtr)[a] = '\0';
		}
	}

	/* normal text without encoding */
	exif_process_string(pszInfoPtr, szValuePtr, ByteCount);
	return strlen(*pszInfoPtr);
}
Unknown