text: /*-------------------------------------------------------------------------
   *
   * pg_wchar.h
   *	  multibyte-character support
   *
   * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/mb/pg_wchar.h
   *
   *	NOTES
   *		This is used both by the backend and by libpq, but should not be
   *		included by libpq client programs.  In particular, a libpq client
   *		should not assume that the encoding IDs used by the version of libpq
   *		it's linked to match up with the IDs declared here.
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PG_WCHAR_H
  #define PG_WCHAR_H
  
  /*
   * The pg_wchar type
   */
  typedef unsigned int pg_wchar;
  
  /*
   * Maximum byte length of multibyte characters in any backend encoding
   */
  #define MAX_MULTIBYTE_CHAR_LEN	4
  
  /*
   * various definitions for EUC
   */
  #define SS2 0x8e				/* single shift 2 (JIS0201) */
  #define SS3 0x8f				/* single shift 3 (JIS0212) */
  
  /*
   * SJIS validation macros
   */
  #define ISSJISHEAD(c) (((c) >= 0x81 && (c) <= 0x9f) || ((c) >= 0xe0 && (c) <= 0xfc))
  #define ISSJISTAIL(c) (((c) >= 0x40 && (c) <= 0x7e) || ((c) >= 0x80 && (c) <= 0xfc))
  
  /*----------------------------------------------------
   * MULE Internal Encoding (MIC)
   *
   * This encoding follows the design used within XEmacs; it is meant to
   * subsume many externally-defined character sets.  Each character includes
   * identification of the character set it belongs to, so the encoding is
   * general but somewhat bulky.
   *
   * Currently PostgreSQL supports 5 types of MULE character sets:
   *
   * 1) 1-byte ASCII characters.  Each byte is below 0x80.
   *
   * 2) "Official" single byte charsets such as ISO-8859-1 (Latin1).
   *	  Each MULE character consists of 2 bytes: LC1 + C1, where LC1 is
   *	  an identifier for the charset (in the range 0x81 to 0x8d) and C1
   *	  is the character code (in the range 0xa0 to 0xff).
   *
   * 3) "Private" single byte charsets such as SISHENG.  Each MULE
   *	  character consists of 3 bytes: LCPRV1 + LC12 + C1, where LCPRV1
   *	  is a private-charset flag, LC12 is an identifier for the charset,
   *	  and C1 is the character code (in the range 0xa0 to 0xff).
   *	  LCPRV1 is either 0x9a (if LC12 is in the range 0xa0 to 0xdf)
   *	  or 0x9b (if LC12 is in the range 0xe0 to 0xef).
   *
   * 4) "Official" multibyte charsets such as JIS X0208.  Each MULE
   *	  character consists of 3 bytes: LC2 + C1 + C2, where LC2 is
   *	  an identifier for the charset (in the range 0x90 to 0x99) and C1
   *	  and C2 form the character code (each in the range 0xa0 to 0xff).
   *
   * 5) "Private" multibyte charsets such as CNS 11643-1992 Plane 3.
   *	  Each MULE character consists of 4 bytes: LCPRV2 + LC22 + C1 + C2,
   *	  where LCPRV2 is a private-charset flag, LC22 is an identifier for
   *	  the charset, and C1 and C2 form the character code (each in the range
   *	  0xa0 to 0xff).  LCPRV2 is either 0x9c (if LC22 is in the range 0xf0
   *	  to 0xf4) or 0x9d (if LC22 is in the range 0xf5 to 0xfe).
   *
   * "Official" encodings are those that have been assigned code numbers by
   * the XEmacs project; "private" encodings have Postgres-specific charset
   * identifiers.
   *
   * See the "XEmacs Internals Manual", available at http://www.xemacs.org,
   * for more details.  Note that for historical reasons, Postgres'
   * private-charset flag values do not match what XEmacs says they should be,
   * so this isn't really exactly MULE (not that private charsets would be
   * interoperable anyway).
   *
   * Note that XEmacs's implementation is different from what emacs does.
   * We follow emacs's implementation, rather than XEmacs's.
   *----------------------------------------------------
   */
  
  /*
   * Charset identifiers (also called "leading bytes" in the MULE documentation)
   */
  
  /*
   * Charset IDs for official single byte encodings (0x81-0x8e)
   */
  #define LC_ISO8859_1		0x81	/* ISO8859 Latin 1 */
  #define LC_ISO8859_2		0x82	/* ISO8859 Latin 2 */
  #define LC_ISO8859_3		0x83	/* ISO8859 Latin 3 */
  #define LC_ISO8859_4		0x84	/* ISO8859 Latin 4 */
  #define LC_TIS620			0x85	/* Thai (not supported yet) */
  #define LC_ISO8859_7		0x86	/* Greek (not supported yet) */
  #define LC_ISO8859_6		0x87	/* Arabic (not supported yet) */
  #define LC_ISO8859_8		0x88	/* Hebrew (not supported yet) */
  #define LC_JISX0201K		0x89	/* Japanese 1 byte kana */
  #define LC_JISX0201R		0x8a	/* Japanese 1 byte Roman */
  /* Note that 0x8b seems to be unused as of Emacs 20.7.
   * However, there might be a chance that 0x8b could be used
   * in later versions of Emacs.
   */
  #define LC_KOI8_R			0x8b	/* Cyrillic KOI8-R */
  #define LC_ISO8859_5		0x8c	/* ISO8859 Cyrillic */
  #define LC_ISO8859_9		0x8d	/* ISO8859 Latin 5 (not supported yet) */
  #define LC_ISO8859_15		0x8e	/* ISO8859 Latin 15 (not supported yet) */
  /* #define CONTROL_1		0x8f	control characters (unused) */
  
  /* Is a leading byte for "official" single byte encodings? */
  #define IS_LC1(c)	((unsigned char)(c) >= 0x81 && (unsigned char)(c) <= 0x8d)
  
  /*
   * Charset IDs for official multibyte encodings (0x90-0x99)
   * 0x9a-0x9d are free. 0x9e and 0x9f are reserved.
   */
  #define LC_JISX0208_1978	0x90	/* Japanese Kanji, old JIS (not supported) */
  #define LC_GB2312_80		0x91	/* Chinese */
  #define LC_JISX0208			0x92	/* Japanese Kanji (JIS X 0208) */
  #define LC_KS5601			0x93	/* Korean */
  #define LC_JISX0212			0x94	/* Japanese Kanji (JIS X 0212) */
  #define LC_CNS11643_1		0x95	/* CNS 11643-1992 Plane 1 */
  #define LC_CNS11643_2		0x96	/* CNS 11643-1992 Plane 2 */
  #define LC_JISX0213_1		0x97	/* Japanese Kanji (JIS X 0213 Plane 1)
  									 * (not supported) */
  #define LC_BIG5_1			0x98	/* Plane 1 Chinese traditional (not
  									 * supported) */
  #define LC_BIG5_2			0x99	/* Plane 1 Chinese traditional (not
  									 * supported) */
  
  /* Is a leading byte for "official" multibyte encodings? */
  #define IS_LC2(c)	((unsigned char)(c) >= 0x90 && (unsigned char)(c) <= 0x99)
  
  /*
   * Postgres-specific prefix bytes for "private" single byte encodings
   * (According to the MULE docs, we should be using 0x9e for this)
   */
  #define LCPRV1_A		0x9a
  #define LCPRV1_B		0x9b
  #define IS_LCPRV1(c)	((unsigned char)(c) == LCPRV1_A || (unsigned char)(c) == LCPRV1_B)
  #define IS_LCPRV1_A_RANGE(c)	\
  	((unsigned char)(c) >= 0xa0 && (unsigned char)(c) <= 0xdf)
  #define IS_LCPRV1_B_RANGE(c)	\
  	((unsigned char)(c) >= 0xe0 && (unsigned char)(c) <= 0xef)
  
  /*
   * Postgres-specific prefix bytes for "private" multibyte encodings
   * (According to the MULE docs, we should be using 0x9f for this)
   */
  #define LCPRV2_A		0x9c
  #define LCPRV2_B		0x9d
  #define IS_LCPRV2(c)	((unsigned char)(c) == LCPRV2_A || (unsigned char)(c) == LCPRV2_B)
  #define IS_LCPRV2_A_RANGE(c)	\
  	((unsigned char)(c) >= 0xf0 && (unsigned char)(c) <= 0xf4)
  #define IS_LCPRV2_B_RANGE(c)	\
  	((unsigned char)(c) >= 0xf5 && (unsigned char)(c) <= 0xfe)
  
  /*
   * Charset IDs for private single byte encodings (0xa0-0xef)
   */
  #define LC_SISHENG			0xa0	/* Chinese SiSheng characters for
  									 * PinYin/ZhuYin (not supported) */
  #define LC_IPA				0xa1	/* IPA (International Phonetic
  									 * Association) (not supported) */
  #define LC_VISCII_LOWER		0xa2	/* Vietnamese VISCII1.1 lower-case (not
  									 * supported) */
  #define LC_VISCII_UPPER		0xa3	/* Vietnamese VISCII1.1 upper-case (not
  									 * supported) */
  #define LC_ARABIC_DIGIT		0xa4	/* Arabic digit (not supported) */
  #define LC_ARABIC_1_COLUMN	0xa5	/* Arabic 1-column (not supported) */
  #define LC_ASCII_RIGHT_TO_LEFT	0xa6	/* ASCII (left half of ISO8859-1) with
  										 * right-to-left direction (not
  										 * supported) */
  #define LC_LAO				0xa7	/* Lao characters (ISO10646 0E80..0EDF)
  									 * (not supported) */
  #define LC_ARABIC_2_COLUMN	0xa8	/* Arabic 1-column (not supported) */
  
  /*
   * Charset IDs for private multibyte encodings (0xf0-0xff)
   */
  #define LC_INDIAN_1_COLUMN	0xf0	/* Indian charset for 1-column width
  									 * glyphs (not supported) */
  #define LC_TIBETAN_1_COLUMN 0xf1	/* Tibetan 1-column width glyphs (not
  									 * supported) */
  #define LC_UNICODE_SUBSET_2 0xf2	/* Unicode characters of the range
  									 * U+2500..U+33FF. (not supported) */
  #define LC_UNICODE_SUBSET_3 0xf3	/* Unicode characters of the range
  									 * U+E000..U+FFFF. (not supported) */
  #define LC_UNICODE_SUBSET	0xf4	/* Unicode characters of the range
  									 * U+0100..U+24FF. (not supported) */
  #define LC_ETHIOPIC			0xf5	/* Ethiopic characters (not supported) */
  #define LC_CNS11643_3		0xf6	/* CNS 11643-1992 Plane 3 */
  #define LC_CNS11643_4		0xf7	/* CNS 11643-1992 Plane 4 */
  #define LC_CNS11643_5		0xf8	/* CNS 11643-1992 Plane 5 */
  #define LC_CNS11643_6		0xf9	/* CNS 11643-1992 Plane 6 */
  #define LC_CNS11643_7		0xfa	/* CNS 11643-1992 Plane 7 */
  #define LC_INDIAN_2_COLUMN	0xfb	/* Indian charset for 2-column width
  									 * glyphs (not supported) */
  #define LC_TIBETAN			0xfc	/* Tibetan (not supported) */
  /* #define FREE				0xfd	free (unused) */
  /* #define FREE				0xfe	free (unused) */
  /* #define FREE				0xff	free (unused) */
  
  /*----------------------------------------------------
   * end of MULE stuff
   *----------------------------------------------------
   */
  
  /*
   * PostgreSQL encoding identifiers
   *
   * WARNING: the order of this enum must be same as order of entries
   *			in the pg_enc2name_tbl[] array (in mb/encnames.c), and
   *			in the pg_wchar_table[] array (in mb/wchar.c)!
   *
   *			If you add some encoding don't forget to check
   *			PG_ENCODING_BE_LAST macro.
   *
   * PG_SQL_ASCII is default encoding and must be = 0.
   *
   * XXX	We must avoid renumbering any backend encoding until libpq's major
   * version number is increased beyond 5; it turns out that the backend
   * encoding IDs are effectively part of libpq's ABI as far as 8.2 initdb and
   * psql are concerned.
   */
  typedef enum pg_enc
  {
  	PG_SQL_ASCII = 0,			/* SQL/ASCII */
  	PG_EUC_JP,					/* EUC for Japanese */
  	PG_EUC_CN,					/* EUC for Chinese */
  	PG_EUC_KR,					/* EUC for Korean */
  	PG_EUC_TW,					/* EUC for Taiwan */
  	PG_EUC_JIS_2004,			/* EUC-JIS-2004 */
  	PG_UTF8,					/* Unicode UTF8 */
  	PG_MULE_INTERNAL,			/* Mule internal code */
  	PG_LATIN1,					/* ISO-8859-1 Latin 1 */
  	PG_LATIN2,					/* ISO-8859-2 Latin 2 */
  	PG_LATIN3,					/* ISO-8859-3 Latin 3 */
  	PG_LATIN4,					/* ISO-8859-4 Latin 4 */
  	PG_LATIN5,					/* ISO-8859-9 Latin 5 */
  	PG_LATIN6,					/* ISO-8859-10 Latin6 */
  	PG_LATIN7,					/* ISO-8859-13 Latin7 */
  	PG_LATIN8,					/* ISO-8859-14 Latin8 */
  	PG_LATIN9,					/* ISO-8859-15 Latin9 */
  	PG_LATIN10,					/* ISO-8859-16 Latin10 */
  	PG_WIN1256,					/* windows-1256 */
  	PG_WIN1258,					/* Windows-1258 */
  	PG_WIN866,					/* (MS-DOS CP866) */
  	PG_WIN874,					/* windows-874 */
  	PG_KOI8R,					/* KOI8-R */
  	PG_WIN1251,					/* windows-1251 */
  	PG_WIN1252,					/* windows-1252 */
  	PG_ISO_8859_5,				/* ISO-8859-5 */
  	PG_ISO_8859_6,				/* ISO-8859-6 */
  	PG_ISO_8859_7,				/* ISO-8859-7 */
  	PG_ISO_8859_8,				/* ISO-8859-8 */
  	PG_WIN1250,					/* windows-1250 */
  	PG_WIN1253,					/* windows-1253 */
  	PG_WIN1254,					/* windows-1254 */
  	PG_WIN1255,					/* windows-1255 */
  	PG_WIN1257,					/* windows-1257 */
  	PG_KOI8U,					/* KOI8-U */
  	/* PG_ENCODING_BE_LAST points to the above entry */
  
  	/* followings are for client encoding only */
  	PG_SJIS,					/* Shift JIS (Windows-932) */
  	PG_BIG5,					/* Big5 (Windows-950) */
  	PG_GBK,						/* GBK (Windows-936) */
  	PG_UHC,						/* UHC (Windows-949) */
  	PG_GB18030,					/* GB18030 */
  	PG_JOHAB,					/* EUC for Korean JOHAB */
  	PG_SHIFT_JIS_2004,			/* Shift-JIS-2004 */
  	_PG_LAST_ENCODING_			/* mark only */
  
  } pg_enc;
  
  #define PG_ENCODING_BE_LAST PG_KOI8U
  #define PG_SERVER_ENCODING_BE_LAST PG_GB18030
  
  /*
   * Please use these tests before access to pg_encconv_tbl[]
   * or to other places...
   */
  #define PG_VALID_BE_ENCODING(_enc) \
  		(((_enc) >= 0 && (_enc) <= PG_ENCODING_BE_LAST) || (_enc) == PG_GBK || (_enc) == PG_GB18030)
  
  #define PG_ENCODING_IS_CLIENT_ONLY(_enc) \
  		((_enc) > PG_ENCODING_BE_LAST && (_enc) < _PG_LAST_ENCODING_ && (_enc) != PG_GBK && (_enc) != PG_GB18030)
  
  #define PG_VALID_ENCODING(_enc) \
  		((_enc) >= 0 && (_enc) < _PG_LAST_ENCODING_)
  
  /* On FE are possible all encodings */
  #define PG_VALID_FE_ENCODING(_enc)	PG_VALID_ENCODING(_enc)
  
  /*
   * Table for mapping an encoding number to official encoding name and
   * possibly other subsidiary data.  Be careful to check encoding number
   * before accessing a table entry!
   *
   * if (PG_VALID_ENCODING(encoding))
   *		pg_enc2name_tbl[ encoding ];
   */
  typedef struct pg_enc2name
  {
  	const char *name;
  	pg_enc		encoding;
  #ifdef WIN32
  	unsigned	codepage;		/* codepage for WIN32 */
  #endif
  } pg_enc2name;
  
  extern const pg_enc2name pg_enc2name_tbl[];
  
  /*
   * Encoding names for gettext
   */
  typedef struct pg_enc2gettext
  {
  	pg_enc		encoding;
  	const char *name;
  } pg_enc2gettext;
  
  extern const pg_enc2gettext pg_enc2gettext_tbl[];
  
  /*
   * Encoding names for ICU
   */
  extern bool is_encoding_supported_by_icu(int encoding);
  extern const char *get_encoding_name_for_icu(int encoding);
  
  /*
   * pg_wchar stuff
   */
  typedef int (*mb2wchar_with_len_converter) (const unsigned char *from,
  											pg_wchar *to,
  											int len);
  
  typedef int (*wchar2mb_with_len_converter) (const pg_wchar *from,
  											unsigned char *to,
  											int len);
  
  typedef int (*mblen_converter) (const unsigned char *mbstr);
  
  typedef int (*mbdisplaylen_converter) (const unsigned char *mbstr);
  
  typedef bool (*mbcharacter_incrementer) (unsigned char *mbstr, int len);
  
  typedef int (*mbverifier) (const unsigned char *mbstr, int len);
  
  typedef struct
  {
  	mb2wchar_with_len_converter mb2wchar_with_len;	/* convert a multibyte
  													 * string to a wchar */
  	wchar2mb_with_len_converter wchar2mb_with_len;	/* convert a wchar string
  													 * to a multibyte */
  	mblen_converter mblen;		/* get byte length of a char */
  	mbdisplaylen_converter dsplen;	/* get display width of a char */
  	mbverifier	mbverify;		/* verify multibyte sequence */
  	int			maxmblen;		/* max bytes for a char in this encoding */
  } pg_wchar_tbl;
  
  extern const pg_wchar_tbl pg_wchar_table[];
  
  /*
   * Data structures for conversions between UTF-8 and other encodings
   * (UtfToLocal() and LocalToUtf()).  In these data structures, characters of
   * either encoding are represented by uint32 words; hence we can only support
   * characters up to 4 bytes long.  For example, the byte sequence 0xC2 0x89
   * would be represented by 0x0000C289, and 0xE8 0xA2 0xB4 by 0x00E8A2B4.
   *
   * There are three possible ways a character can be mapped:
   *
   * 1. Using a radix tree, from source to destination code.
   * 2. Using a sorted array of source -> destination code pairs. This
   *	  method is used for "combining" characters. There are so few of
   *	  them that building a radix tree would be wasteful.
   * 3. Using a conversion function.
   */
  
  /*
   * Radix tree for character conversion.
   *
   * Logically, this is actually four different radix trees, for 1-byte,
   * 2-byte, 3-byte and 4-byte inputs. The 1-byte tree is a simple lookup
   * table from source to target code. The 2-byte tree consists of two levels:
   * one lookup table for the first byte, where the value in the lookup table
   * points to a lookup table for the second byte. And so on.
   *
   * Physically, all the trees are stored in one big array, in 'chars16' or
   * 'chars32', depending on the maximum value that needs to be reprented. For
   * each level in each tree, we also store lower and upper bound of allowed
   * values - values outside those bounds are considered invalid, and are left
   * out of the tables.
   *
   * In the intermediate levels of the trees, the values stored are offsets
   * into the chars[16|32] array.
   *
   * In the beginning of the chars[16|32] array, there is always a number of
   * zeros, so that you safely follow an index from an intermediate table
   * without explicitly checking for a zero. Following a zero any number of
   * times will always bring you to the dummy, all-zeros table in the
   * beginning. This helps to shave some cycles when looking up values.
   */
  typedef struct
  {
  	/*
  	 * Array containing all the values. Only one of chars16 or chars32 is
  	 * used, depending on how wide the values we need to represent are.
  	 */
  	const uint16 *chars16;
  	const uint32 *chars32;
  
  	/* Radix tree for 1-byte inputs */
  	uint32		b1root;			/* offset of table in the chars[16|32] array */
  	uint8		b1_lower;		/* min allowed value for a single byte input */
  	uint8		b1_upper;		/* max allowed value for a single byte input */
  
  	/* Radix tree for 2-byte inputs */
  	uint32		b2root;			/* offset of 1st byte's table */
  	uint8		b2_1_lower;		/* min/max allowed value for 1st input byte */
  	uint8		b2_1_upper;
  	uint8		b2_2_lower;		/* min/max allowed value for 2nd input byte */
  	uint8		b2_2_upper;
  
  	/* Radix tree for 3-byte inputs */
  	uint32		b3root;			/* offset of 1st byte's table */
  	uint8		b3_1_lower;		/* min/max allowed value for 1st input byte */
  	uint8		b3_1_upper;
  	uint8		b3_2_lower;		/* min/max allowed value for 2nd input byte */
  	uint8		b3_2_upper;
  	uint8		b3_3_lower;		/* min/max allowed value for 3rd input byte */
  	uint8		b3_3_upper;
  
  	/* Radix tree for 4-byte inputs */
  	uint32		b4root;			/* offset of 1st byte's table */
  	uint8		b4_1_lower;		/* min/max allowed value for 1st input byte */
  	uint8		b4_1_upper;
  	uint8		b4_2_lower;		/* min/max allowed value for 2nd input byte */
  	uint8		b4_2_upper;
  	uint8		b4_3_lower;		/* min/max allowed value for 3rd input byte */
  	uint8		b4_3_upper;
  	uint8		b4_4_lower;		/* min/max allowed value for 4th input byte */
  	uint8		b4_4_upper;
  
  } pg_mb_radix_tree;
  
  /*
   * UTF-8 to local code conversion map (for combined characters)
   */
  typedef struct
  {
  	uint32		utf1;			/* UTF-8 code 1 */
  	uint32		utf2;			/* UTF-8 code 2 */
  	uint32		code;			/* local code */
  } pg_utf_to_local_combined;
  
  /*
   * local code to UTF-8 conversion map (for combined characters)
   */
  typedef struct
  {
  	uint32		code;			/* local code */
  	uint32		utf1;			/* UTF-8 code 1 */
  	uint32		utf2;			/* UTF-8 code 2 */
  } pg_local_to_utf_combined;
  
  /*
   * callback function for algorithmic encoding conversions (in either direction)
   *
   * if function returns zero, it does not know how to convert the code
   */
  typedef uint32 (*utf_local_conversion_func) (uint32 code);
  
  /*
   * Support macro for encoding conversion functions to validate their
   * arguments.  (This could be made more compact if we included fmgr.h
   * here, but we don't want to do that because this header file is also
   * used by frontends.)
   */
  #define CHECK_ENCODING_CONVERSION_ARGS(srcencoding,destencoding) \
  	check_encoding_conversion_args(PG_GETARG_INT32(0), \
  								   PG_GETARG_INT32(1), \
  								   PG_GETARG_INT32(4), \
  								   (srcencoding), \
  								   (destencoding))
  
  
  /*
   * These functions are considered part of libpq's exported API and
   * are also declared in libpq-fe.h.
   */
  extern int	pg_char_to_encoding(const char *name);
  extern const char *pg_encoding_to_char(int encoding);
  extern int	pg_valid_server_encoding_id(int encoding);
  
  /*
   * Remaining functions are not considered part of libpq's API, though many
   * of them do exist inside libpq.
   */
  extern int	pg_mb2wchar(const char *from, pg_wchar *to);
  extern int	pg_mb2wchar_with_len(const char *from, pg_wchar *to, int len);
  extern int pg_encoding_mb2wchar_with_len(int encoding,
  							  const char *from, pg_wchar *to, int len);
  extern int	pg_wchar2mb(const pg_wchar *from, char *to);
  extern int	pg_wchar2mb_with_len(const pg_wchar *from, char *to, int len);
  extern int pg_encoding_wchar2mb_with_len(int encoding,
  							  const pg_wchar *from, char *to, int len);
  extern int	pg_char_and_wchar_strcmp(const char *s1, const pg_wchar *s2);
  extern int	pg_wchar_strncmp(const pg_wchar *s1, const pg_wchar *s2, size_t n);
  extern int	pg_char_and_wchar_strncmp(const char *s1, const pg_wchar *s2, size_t n);
  extern size_t pg_wchar_strlen(const pg_wchar *wstr);
  extern int	pg_mblen(const char *mbstr);
  extern int	pg_dsplen(const char *mbstr);
  extern int	pg_encoding_mblen(int encoding, const char *mbstr);
  extern int	pg_encoding_dsplen(int encoding, const char *mbstr);
  extern int	pg_encoding_verifymb(int encoding, const char *mbstr, int len);
  extern int	pg_mule_mblen(const unsigned char *mbstr);
  extern int	pg_mic_mblen(const unsigned char *mbstr);
  extern int	pg_mbstrlen(const char *mbstr);
  extern int	pg_mbstrlen_with_len(const char *mbstr, int len);
  extern int	pg_mbcliplen(const char *mbstr, int len, int limit);
  extern int pg_encoding_mbcliplen(int encoding, const char *mbstr,
  					  int len, int limit);
  extern int	pg_mbcharcliplen(const char *mbstr, int len, int imit);
  extern int	pg_encoding_max_length(int encoding);
  extern int	pg_database_encoding_max_length(void);
  extern mbcharacter_incrementer pg_database_encoding_character_incrementer(void);
  
  extern int	PrepareClientEncoding(int encoding);
  extern int	SetClientEncoding(int encoding);
  extern void InitializeClientEncoding(void);
  extern int	pg_get_client_encoding(void);
  extern const char *pg_get_client_encoding_name(void);
  
  extern void SetDatabaseEncoding(int encoding);
  extern int	GetDatabaseEncoding(void);
  extern const char *GetDatabaseEncodingName(void);
  extern void SetMessageEncoding(int encoding);
  extern int	GetMessageEncoding(void);
  
  #ifdef ENABLE_NLS
  extern int	pg_bind_textdomain_codeset(const char *domainname);
  #endif
  
  extern int	pg_valid_client_encoding(const char *name);
  extern int	pg_valid_server_encoding(const char *name);
  
  extern unsigned char *unicode_to_utf8(pg_wchar c, unsigned char *utf8string);
  extern pg_wchar utf8_to_unicode(const unsigned char *c);
  extern int	pg_utf_mblen(const unsigned char *);
  extern unsigned char *pg_do_encoding_conversion(unsigned char *src, int len,
  						  int src_encoding,
  						  int dest_encoding);
  
  extern char *pg_client_to_server(const char *s, int len);
  extern char *pg_server_to_client(const char *s, int len);
  extern char *pg_any_to_server(const char *s, int len, int encoding);
  extern char *pg_server_to_any(const char *s, int len, int encoding);
  
  extern unsigned short BIG5toCNS(unsigned short big5, unsigned char *lc);
  extern unsigned short CNStoBIG5(unsigned short cns, unsigned char lc);
  
  extern void UtfToLocal(const unsigned char *utf, int len,
  		   unsigned char *iso,
  		   const pg_mb_radix_tree *map,
  		   const pg_utf_to_local_combined *cmap, int cmapsize,
  		   utf_local_conversion_func conv_func,
  		   int encoding);
  extern void LocalToUtf(const unsigned char *iso, int len,
  		   unsigned char *utf,
  		   const pg_mb_radix_tree *map,
  		   const pg_local_to_utf_combined *cmap, int cmapsize,
  		   utf_local_conversion_func conv_func,
  		   int encoding);
  
  extern bool pg_verifymbstr(const char *mbstr, int len, bool noError);
  extern bool pg_verify_mbstr(int encoding, const char *mbstr, int len,
  				bool noError);
  extern int pg_verify_mbstr_len(int encoding, const char *mbstr, int len,
  					bool noError);
  
  extern void check_encoding_conversion_args(int src_encoding,
  							   int dest_encoding,
  							   int len,
  							   int expected_src_encoding,
  							   int expected_dest_encoding);
  
  extern void report_invalid_encoding(int encoding, const char *mbstr, int len) pg_attribute_noreturn();
  extern void report_untranslatable_char(int src_encoding, int dest_encoding,
  						   const char *mbstr, int len) pg_attribute_noreturn();
  
  extern void local2local(const unsigned char *l, unsigned char *p, int len,
  			int src_encoding, int dest_encoding, const unsigned char *tab);
  extern void pg_ascii2mic(const unsigned char *l, unsigned char *p, int len);
  extern void pg_mic2ascii(const unsigned char *mic, unsigned char *p, int len);
  extern void latin2mic(const unsigned char *l, unsigned char *p, int len,
  		  int lc, int encoding);
  extern void mic2latin(const unsigned char *mic, unsigned char *p, int len,
  		  int lc, int encoding);
  extern void latin2mic_with_table(const unsigned char *l, unsigned char *p,
  					 int len, int lc, int encoding,
  					 const unsigned char *tab);
  extern void mic2latin_with_table(const unsigned char *mic, unsigned char *p,
  					 int len, int lc, int encoding,
  					 const unsigned char *tab);
  
  extern bool pg_utf8_islegal(const unsigned char *source, int length);
  
  #ifdef WIN32
  extern WCHAR *pgwin32_message_to_UTF16(const char *str, int len, int *utf16len);
  #endif
  
  #endif							/* PG_WCHAR_H */
  