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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_COMMON_UTF8_H
#define CEPH_COMMON_UTF8_H
#define MAX_UTF8_SZ 6
#define INVALID_UTF8_CHAR 0xfffffffful
#ifdef __cplusplus
extern "C" {
#endif
/* Checks if a buffer is valid UTF-8.
* Returns 0 if it is, and one plus the offset of the first invalid byte
* if it is not.
*/
int check_utf8(const char *buf, int len);
/* Checks if a null-terminated string is valid UTF-8.
* Returns 0 if it is, and one plus the offset of the first invalid byte
* if it is not.
*/
int check_utf8_cstr(const char *buf);
/* Returns true if 'ch' is a control character.
* We do count newline as a control character, but not NULL.
*/
int is_control_character(int ch);
/* Checks if a buffer contains control characters.
*/
int check_for_control_characters(const char *buf, int len);
/* Checks if a null-terminated string contains control characters.
*/
int check_for_control_characters_cstr(const char *buf);
/* Encode a 31-bit UTF8 code point to 'buf'.
* Assumes buf is of size MAX_UTF8_SZ
* Returns -1 on failure; number of bytes in the encoded value otherwise.
*/
int encode_utf8(unsigned long u, unsigned char *buf);
/*
* Decode a UTF8 character from an array of bytes. Return character code.
* Upon error, return INVALID_UTF8_CHAR.
*/
unsigned long decode_utf8(unsigned char *buf, int nbytes);
#ifdef __cplusplus
}
#endif
#endif
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